$FRME
FIRST MERCHANTS CORP Stock $frme

$frme Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000071253420000060 Filed on February 28, 2020

Income Statement

Concept	2019 Q4	2018 Q4	2018 Q3
Revenue	$125.8M	$108.7M	$104.8M
YoY Change	15.8%	20.26%	23.52%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$2.700M	$2.200M	$2.200M
YoY Change	22.73%	-4.35%	10.0%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$28.24M	$20.77M	$18.31M
YoY Change	35.96%	79.31%	75.64%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$56.13M	$47.66M	$49.59M
YoY Change	17.76%	20.38%	53.55%
Income Tax	$8.298M	$5.949M	$8.478M
% Of Pretax Income	14.78%	12.48%	17.1%
Net Earnings	$47.83M	$41.71M	$41.11M
YoY Change	14.66%	71.07%	68.79%
Net Earnings / Revenue	38.01%	38.39%	39.23%
Basic Earnings Per Share	$0.87	$0.85	$0.83
Diluted Earnings Per Share	$0.87	$0.85	$0.83
COMMON SHARES
Basic Shares Outstanding	55.35M shares	49.31M shares	49.29M shares
Diluted Shares Outstanding	55.52M shares	49.51M shares	49.49M shares

Balance Sheet

Concept	2019 Q4	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$177.2M	$139.2M	$142.5M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$113.1M	$93.42M	$93.73M
YoY Change	21.02%	-2.54%	-8.54%
Goodwill	$543.9M	$445.4M	$445.4M
YoY Change	22.13%	0.0%	0.0%
Intangibles	$34.96M	$24.43M	$26.05M
YoY Change	43.12%	-21.57%	-21.53%
Long-Term Investments
YoY Change
Other Assets	$12.00M	$24.00M	$26.00M
YoY Change	-50.0%	0.0%	-27.78%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$12.46B	$9.885B	$9.787B
YoY Change	26.03%	5.52%	8.15%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$7.000M	$6.000M	$6.000M
YoY Change	16.67%	50.0%	20.0%
Accrued Expenses	$21.00M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$243.0M	$218.0M	$209.0M
YoY Change	11.47%	-22.42%	-13.64%
Long-Term Debt Due		$0.00	$0.00
YoY Change
Total Short-Term Liabilities	$28.00M	$6.000M	$6.000M
YoY Change	366.67%	50.0%	20.0%
LONG-TERM LIABILITIES
Long-Term Debt	$139.0M	$138.0M	$138.0M
YoY Change	0.72%	-0.72%	-1.43%
Other Long-Term Liabilities	$70.00M	$45.00M	$54.00M
YoY Change	55.56%	-15.09%	-12.9%
Total Long-Term Liabilities	$209.0M	$183.0M	$192.0M
YoY Change	14.21%	-4.69%	-4.95%
TOTAL LIABILITIES
Total Short-Term Liabilities	$28.00M	$6.000M	$6.000M
Total Long-Term Liabilities	$209.0M	$183.0M	$192.0M
Total Liabilities	$10.67B	$8.476B	$8.426B
YoY Change	25.89%	5.11%	8.49%
SHAREHOLDERS EQUITY
Retained Earnings	$696.5M	$583.3M	$552.6M
YoY Change	19.4%	25.39%	22.85%
Common Stock	$6.921M	$6.169M	$6.163M
YoY Change	12.19%	0.39%	0.33%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.786B	$1.408B	$1.361B
YoY Change
Total Liabilities & Shareholders Equity	$12.46B	$9.885B	$9.787B
YoY Change	26.03%	5.52%	8.15%

Cashflow Statement

Concept	2019 Q4	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	$47.83M	$41.71M	$41.11M
YoY Change	14.66%	71.07%	68.79%
Depreciation, Depletion And Amortization	$2.700M	$2.200M	$2.200M
YoY Change	22.73%	-4.35%	10.0%
Cash From Operating Activities	$40.20M	$44.00M	$54.50M
YoY Change	-8.64%	-6.58%	148.86%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities	-$175.6M	-$97.20M	-$58.30M
YoY Change	80.66%	-70.32%	-3.0%
Cash From Investing Activities	-$175.6M	-$97.20M	-$58.30M
YoY Change	80.66%	-70.32%	-3.0%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	110.2M	49.80M	12.50M
YoY Change	121.29%	-82.75%	-70.38%
NET CHANGE
Cash From Operating Activities	40.20M	44.00M	54.50M
Cash From Investing Activities	-175.6M	-97.20M	-58.30M
Cash From Financing Activities	110.2M	49.80M	12.50M
Net Change In Cash	-25.20M	-3.400M	8.700M
YoY Change	641.18%	-140.96%	117.5%
FREE CASH FLOW
Cash From Operating Activities	$40.20M	$44.00M	$54.50M
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0000712534
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CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2017	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.69
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.84
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.00
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CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.125
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	49349800	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	55368482	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	49349800	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	55368482	shares
CY2018	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	USD
CY2018	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	0	USD
CY2018Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	125	shares
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-1125000	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	125	shares
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	52000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-226000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	1001000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-1239000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	576000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	797000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	857000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	4000	USD
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CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-3174000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	12946000	USD
CY2018Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
CY2019Q4	us-gaap	Preferred Stock Liquidation Preference PreferredStockLiquidationPreference	1000
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CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1000
CY2018Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	600	shares
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	600	shares
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CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	125	shares
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	0-17071
CY2019	dei	Entity Registrant Name EntityRegistrantName	FIRST MERCHANTS CORPORATION
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	IN
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	35-1544218
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	200 East Jackson Street
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Muncie
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	IN
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	47305-2814
CY2019	dei	City Area Code CityAreaCode	765
CY2019	dei	Local Phone Number LocalPhoneNumber	747-1500
CY2019	dei	Security12b Title Security12bTitle	Common Stock, $0.125 stated value per share
CY2019	dei	Trading Symbol TradingSymbol	FRME
CY2019	dei	Security Exchange Name SecurityExchangeName	NASDAQ
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CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
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CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
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CY2017	us-gaap	Equipment Expense EquipmentExpense	13090000	USD
CY2019	us-gaap	Marketing Expense MarketingExpense	6650000	USD
CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	356660000	USD
CY2018	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	338857000	USD
CY2017	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	277284000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	2800000	USD
CY2018	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	7227000	USD
CY2017	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	9143000	USD
CY2019	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	353860000	USD
CY2018	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	331630000	USD
CY2017	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	268141000	USD
CY2019	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	7891000	USD
CY2018	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	7029000	USD
CY2017	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	7564000	USD
CY2019	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	4518000	USD
CY2018	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	4020000	USD
CY2017	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	3906000	USD
CY2019	frme	Gain Loss On Life Insurance Benefits GainLossOnLifeInsuranceBenefits	19000	USD
CY2018	frme	Gain Loss On Life Insurance Benefits GainLossOnLifeInsuranceBenefits	198000	USD
CY2017	frme	Gain Loss On Life Insurance Benefits GainLossOnLifeInsuranceBenefits	2671000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	4415000	USD
CY2018	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	4269000	USD
CY2017	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	2631000	USD
CY2019	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2068000	USD
CY2018	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2699000	USD
CY2017	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	992000	USD
CY2019	us-gaap	Noninterest Income NoninterestIncome	86688000	USD
CY2018	us-gaap	Noninterest Income NoninterestIncome	76459000	USD
CY2017	us-gaap	Noninterest Income NoninterestIncome	71009000	USD
CY2019	us-gaap	Labor And Related Expense LaborAndRelatedExpense	144037000	USD
CY2018	us-gaap	Labor And Related Expense LaborAndRelatedExpense	131704000	USD
CY2017	us-gaap	Labor And Related Expense LaborAndRelatedExpense	119812000	USD
CY2019	us-gaap	Occupancy Net OccupancyNet	19584000	USD
CY2018	us-gaap	Occupancy Net OccupancyNet	18341000	USD
CY2017	us-gaap	Occupancy Net OccupancyNet	16976000	USD
CY2018	us-gaap	Marketing Expense MarketingExpense	4681000	USD
CY2017	us-gaap	Marketing Expense MarketingExpense	3739000	USD
CY2019	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	16476000	USD
CY2018	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	13215000	USD
CY2017	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	12242000	USD
CY2019	us-gaap	Noninterest Expense Printing And Fulfillment NoninterestExpensePrintingAndFulfillment	1445000	USD
CY2018	us-gaap	Noninterest Expense Printing And Fulfillment NoninterestExpensePrintingAndFulfillment	1425000	USD
CY2017	us-gaap	Noninterest Expense Printing And Fulfillment NoninterestExpensePrintingAndFulfillment	1283000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5994000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6719000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5647000	USD
CY2019	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	717000	USD
CY2018	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	2920000	USD
CY2017	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	2564000	USD
CY2019	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	2428000	USD
CY2018	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	1470000	USD
CY2017	us-gaap	Foreclosed Real Estate Expense ForeclosedRealEstateExpense	1903000	USD
CY2019	us-gaap	Professional And Contract Services Expense ProfessionalAndContractServicesExpense	15410000	USD
CY2018	us-gaap	Professional And Contract Services Expense ProfessionalAndContractServicesExpense	8176000	USD
CY2017	us-gaap	Professional And Contract Services Expense ProfessionalAndContractServicesExpense	12757000	USD
CY2019	us-gaap	Other Noninterest Expense OtherNoninterestExpense	17804000	USD
CY2018	us-gaap	Other Noninterest Expense OtherNoninterestExpense	16966000	USD
CY2017	us-gaap	Other Noninterest Expense OtherNoninterestExpense	15543000	USD
CY2019	us-gaap	Noninterest Expense NoninterestExpense	246763000	USD
CY2018	us-gaap	Noninterest Expense NoninterestExpense	219951000	USD
CY2017	us-gaap	Noninterest Expense NoninterestExpense	205556000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	193785000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	188138000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	133594000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29325000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28999000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	37524000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	164460000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	159139000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	96070000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.20
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.23
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.13
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.19
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.22
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.12
CY2019	us-gaap	Net Income Loss NetIncomeLoss	164460000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	159139000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	96070000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	48703000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-13872000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	9645000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-846000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	437000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	9000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	3224000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	3002000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	1070000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	4579000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-1435000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	2686000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Costs Credit Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax	-84000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Costs Credit Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax	16000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Costs Credit Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax	597000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	49296000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-17888000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	10673000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	213756000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	141251000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	106743000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	901657000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	96070000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	10673000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	31820000	USD
CY2017	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	321431000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	2827000	USD
CY2017	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	519000	USD
CY2017	frme	Stock Issued Under Dividend Reinvestment And Stock Purchase Plan StockIssuedUnderDividendReinvestmentAndStockPurchasePlan	991000	USD
CY2017	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2398000	USD
CY2017	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	1283000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	1303463000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	159139000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-17888000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	41660000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	3592000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	707000	USD
CY2018	frme	Stock Issued Under Dividend Reinvestment And Stock Purchase Plan StockIssuedUnderDividendReinvestmentAndStockPurchasePlan	1211000	USD
CY2018	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1598000	USD
CY2018	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	1902000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1408260000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	164460000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	49296000	USD
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	51276000	USD
CY2019	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	229926000	USD
CY2019	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	19041000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	4115000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	702000	USD
CY2019	frme	Stock Issued Under Dividend Reinvestment And Stock Purchase Plan StockIssuedUnderDividendReinvestmentAndStockPurchasePlan	1531000	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	144000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	1680000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1786437000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	164460000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	159139000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	96070000	USD
CY2019	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	2800000	USD
CY2018	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	7227000	USD
CY2017	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	9143000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	9383000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	8842000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	7967000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4965000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3524000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	15523000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	4115000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	3592000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	2827000	USD
CY2019	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	511407000	USD
CY2018	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	372791000	USD
CY2017	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	377252000	USD
CY2019	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	513357000	USD
CY2018	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	380254000	USD
CY2017	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	387095000	USD
CY2019	frme	Gain Losson Salesof Loans Heldforsale GainLossonSalesofLoansHeldforsale	6209000	USD
CY2018	frme	Gain Losson Salesof Loans Heldforsale GainLossonSalesofLoansHeldforsale	5025000	USD
CY2017	frme	Gain Losson Salesof Loans Heldforsale GainLossonSalesofLoansHeldforsale	5910000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	4415000	USD
CY2018	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	4269000	USD
CY2017	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	2631000	USD
CY2019	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	4518000	USD
CY2018	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	4020000	USD
CY2017	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	3906000	USD
CY2019	frme	Gain Loss On Insurance Benefits GainLossOnInsuranceBenefits	19000	USD
CY2018	frme	Gain Loss On Insurance Benefits GainLossOnInsuranceBenefits	198000	USD
CY2017	frme	Gain Loss On Insurance Benefits GainLossOnInsuranceBenefits	2671000	USD
CY2019	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	4659000	USD
CY2018	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	3751000	USD
CY2017	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	6838000	USD
CY2019	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	1090000	USD
CY2018	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	1217000	USD
CY2017	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	31000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-9464000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-6494000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-7054000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	178407000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	180235000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	126502000	USD
CY2019	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	199928000	USD
CY2018	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	-1936000	USD
CY2017	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	237936000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	676791000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	370284000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	479045000	USD
CY2019	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	423385000	USD
CY2018	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	30465000	USD
CY2017	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	30220000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	132837000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	154519000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	94165000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	138356000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	66129000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	77881000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	70846000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	130502000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	72220000	USD
CY2019	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	0	USD
CY2018	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	763000	USD
CY2017	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-40000	USD
CY2019	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	512364000	USD
CY2018	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	483418000	USD
CY2017	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	670000000	USD
CY2019	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	10207000	USD
CY2018	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2017	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	54536000	USD
CY2019	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	2060000	USD
CY2018	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	9121000	USD
CY2017	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	6584000	USD
CY2019	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	815000	USD
CY2018	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	2836000	USD
CY2017	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	11655000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	8564000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-804000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	4047000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1006399000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-575576000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-635330000	USD
CY2019	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	883524000	USD
CY2018	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	526859000	USD
CY2017	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	425742000	USD
CY2019	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	95913000	USD
CY2018	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	55204000	USD
CY2017	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	75236000	USD
CY2019	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	599298000	USD
CY2018	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	1515526000	USD
CY2017	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	1088189000	USD
CY2019	us-gaap	Repayments Of Debt RepaymentsOfDebt	643169000	USD
CY2018	us-gaap	Repayments Of Debt RepaymentsOfDebt	1677860000	USD
CY2017	us-gaap	Repayments Of Debt RepaymentsOfDebt	1024166000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	51276000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	41660000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	31820000	USD
CY2019	frme	Proceeds From Issuance Of Common Stock Under Employee Benefit Plans ProceedsFromIssuanceOfCommonStockUnderEmployeeBenefitPlans	702000	USD
CY2018	frme	Proceeds From Issuance Of Common Stock Under Employee Benefit Plans ProceedsFromIssuanceOfCommonStockUnderEmployeeBenefitPlans	707000	USD
CY2018	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	1211000	USD
CY2018	frme	Supplemental Non Cash Investing Activities SupplementalNonCashInvestingActivities	6551000	USD
CY2018	frme	Fixed Assets Transfer To Other Assets FixedAssetsTransferToOtherAssets	374000	USD
CY2017	frme	Fixed Assets Transfer To Other Assets FixedAssetsTransferToOtherAssets	6753000	USD
CY2019	frme	Supplemental Non Cash Investing Activities SupplementalNonCashInvestingActivities	0	USD
CY2017	frme	Proceeds From Issuance Of Common Stock Under Employee Benefit Plans ProceedsFromIssuanceOfCommonStockUnderEmployeeBenefitPlans	519000	USD
CY2019	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	1531000	USD
CY2017	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	991000	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	144000	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1598000	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2398000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1680000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1902000	USD
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1283000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	19041000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	865946000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	379683000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	535806000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	37954000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-15658000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	26978000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	139247000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	154905000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	127927000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	177201000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	139247000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	154905000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	107598000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	67870000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	36332000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	23588000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	23289000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	22421000	USD
CY2019	frme	Valuetransferredfromloanstorealestateowned Re Oinnoncashtransactions ValuetransferredfromloanstorealestateownedREOinnoncashtransactions	7031000	USD
CY2018	frme	Valuetransferredfromloanstorealestateowned Re Oinnoncashtransactions ValuetransferredfromloanstorealestateownedREOinnoncashtransactions	855000	USD
CY2017	frme	Valuetransferredfromloanstorealestateowned Re Oinnoncashtransactions ValuetransferredfromloanstorealestateownedREOinnoncashtransactions	8360000	USD
CY2019	frme	Fixed Assets Transfer To Other Assets FixedAssetsTransferToOtherAssets	1210000	USD
CY2017	frme	Supplemental Non Cash Investing Activities SupplementalNonCashInvestingActivities	9401000	USD
CY2017	frme	Liabilities Assumed During Period LiabilitiesAssumedDuringPeriod	1209954000	USD
CY2019	frme	Heldtomaturity Transfersto Availableforsale Amount HeldtomaturityTransferstoAvailableforsaleAmount	0	USD
CY2018	frme	Heldtomaturity Transfersto Availableforsale Amount HeldtomaturityTransferstoAvailableforsaleAmount	30794000	USD
CY2017	frme	Heldtomaturity Transfersto Availableforsale Amount HeldtomaturityTransferstoAvailableforsaleAmount	0	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	23529000	USD
CY2018	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2017	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2019	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	1451287000	USD
CY2018	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	0	USD
CY2017	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	1531397000	USD
CY2019	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	15000	USD
CY2018	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	0	USD
CY2017	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	12000	USD
CY2019	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	229926000	USD
CY2018	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	0	USD
CY2017	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	321431000	USD
CY2019	frme	Liabilities Assumed During Period LiabilitiesAssumedDuringPeriod	1221346000	USD
CY2018	frme	Liabilities Assumed During Period LiabilitiesAssumedDuringPeriod	0	USD
CY2019Q4	frme	Reserve Requirement Federal Reserve Bank ReserveRequirementFederalReserveBank	78934000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1740420000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	51816000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	2211000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1790025000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	827566000	USD
CY2019	frme	Allowance For Loan Losses Number Of Key Elements Applied To Determination Of Valuation Allowance AllowanceForLoanLossesNumberOfKeyElementsAppliedToDeterminationOfValuationAllowance	3	key_element
CY2019	frme	Commercial Banking Relationship Credit Quality Weakness Thresholdfor Individual Review CommercialBankingRelationshipCreditQualityWeaknessThresholdforIndividualReview	500000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	22073000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	545000	USD
CY2019	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="line-height:120%;text-align:left;font-size:8pt;"><span style="font-family:Arial;font-size:8pt;font-weight:bold;">RECLASSIFICATIONS</span><span style="font-family:Arial;font-size:8pt;"> have been made to prior financial statements to conform to the current financial statement presentation. These reclassifications had no effect on net income.</span></div>
CY2019	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	2.88
CY2018	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	3.18
CY2019	frme	Business Acquisition Pro Forma Revenue Net Interest Income Plus Other Income BusinessAcquisitionProFormaRevenueNetInterestIncomePlusOtherIncome	474891000	USD
CY2018	frme	Business Acquisition Pro Forma Revenue Net Interest Income Plus Other Income BusinessAcquisitionProFormaRevenueNetInterestIncomePlusOtherIncome	476878000	USD
CY2019	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	161228000	USD
CY2018	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	177906000	USD
CY2019	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	2.89
CY2018	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	3.19
CY2019Q4	frme	Cash Balance Federal Home Loan Bank And Federal Reserve Bank CashBalanceFederalHomeLoanBankAndFederalReserveBank	39844000	USD
CY2019Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	806038000	USD
CY2019Q4	frme	Debt Securities Availableforsaleand Heldtomaturity Amortized Cost DebtSecuritiesAvailableforsaleandHeldtomaturityAmortizedCost	2546458000	USD
CY2019Q4	frme	Debt Securities Availableforsaleand Heldtomaturity Accumulated Gross Unrealized Gainbefore Tax DebtSecuritiesAvailableforsaleandHeldtomaturityAccumulatedGrossUnrealizedGainbeforeTax	73889000	USD
CY2019Q4	frme	Debt Securities Availableforsaleand Heldtomaturity Amortized Cost Accumulated Gross Unrealized Lossbefore Tax DebtSecuritiesAvailableforsaleandHeldtomaturityAmortizedCostAccumulatedGrossUnrealizedLossbeforeTax	2756000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale And Held To Maturity DebtSecuritiesAvailableForSaleAndHeldToMaturity	2617591000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1149727000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	6721000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	14253000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1142195000	USD
CY2018Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	490387000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	3571000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	4741000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	489217000	USD
CY2018Q4	frme	Debt Securities Availableforsaleand Heldtomaturity Amortized Cost DebtSecuritiesAvailableforsaleandHeldtomaturityAmortizedCost	1640114000	USD
CY2018Q4	frme	Debt Securities Availableforsaleand Heldtomaturity Accumulated Gross Unrealized Gainbefore Tax DebtSecuritiesAvailableforsaleandHeldtomaturityAccumulatedGrossUnrealizedGainbeforeTax	10292000	USD
CY2018Q4	frme	Debt Securities Availableforsaleand Heldtomaturity Amortized Cost Accumulated Gross Unrealized Lossbefore Tax DebtSecuritiesAvailableforsaleandHeldtomaturityAmortizedCostAccumulatedGrossUnrealizedLossbeforeTax	18994000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale And Held To Maturity DebtSecuritiesAvailableForSaleAndHeldToMaturity	1631412000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	203946000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	2133000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	20796000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	78000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	224742000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	2211000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	150216000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	475000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	20458000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	70000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	170674000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	545000	USD
CY2019Q4	frme	Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value SecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	354162000	USD
CY2019Q4	frme	Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses SecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses	2608000	USD
CY2019Q4	frme	Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value SecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	41254000	USD
CY2019Q4	frme	Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	148000	USD
CY2019Q4	frme	Securities Continuous Unrealized Loss Position Fair Value SecuritiesContinuousUnrealizedLossPositionFairValue	395416000	USD
CY2019Q4	frme	Securities Continuous Unrealized Loss Position Aggregate Losses SecuritiesContinuousUnrealizedLossPositionAggregateLosses	2756000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	432522000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	6361000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	255149000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	7892000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	687671000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	14253000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	117780000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	1245000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	127126000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	3496000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	244906000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	4741000	USD
CY2018Q4	frme	Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value SecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	550302000	USD
CY2018Q4	frme	Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses SecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses	7606000	USD
CY2018Q4	frme	Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value SecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	382275000	USD
CY2018Q4	frme	Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	11388000	USD
CY2018Q4	frme	Securities Continuous Unrealized Loss Position Fair Value SecuritiesContinuousUnrealizedLossPositionFairValue	932577000	USD
CY2018Q4	frme	Securities Continuous Unrealized Loss Position Aggregate Losses SecuritiesContinuousUnrealizedLossPositionAggregateLosses	18994000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	1134000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	1136000	USD
CY2019Q4	frme	Held To Maturity Securities Debt Maturities Next Rolling Twelve Months Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsCarryingAmount	9920000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities Next Rolling Twelve Months Fair Value HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	10105000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	5031000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	5141000	USD
CY2019Q4	frme	Held To Maturity Securities Debt Maturities Rolling Year Two Through Five Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveCarryingAmount	45197000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Two Through Five Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	45654000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	74745000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	76920000	USD
CY2019Q4	frme	Held To Maturity Securities Debt Maturities Rolling Year Six Through Ten Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenCarryingAmount	84153000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities Rolling Year Six Through Ten Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	88844000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis	817161000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue	855505000	USD
CY2019Q4	frme	Held To Maturity Securities Debt Maturities Rolling After Ten Years Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsCarryingAmount	231964000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities Rolling After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue	241639000	USD
CY2019Q4	frme	Available For Sale Securities Debt Maturity With Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturityWithSingleMaturityDateAmortizedCost	898071000	USD
CY2019Q4	frme	Available For Sale Securities Debt Maturity With Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturityWithSingleMaturityDateFairValue	938702000	USD
CY2019Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	806038000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	827566000	USD
CY2019Q4	frme	Held To Maturity Securities Debt Maturities With Single Maturity Date Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithSingleMaturityDateNetCarryingAmount	371234000	USD
CY2019Q4	frme	Held To Maturity Securities Debt Maturity With Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturityWithSingleMaturityDateFairValue	386242000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1740420000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1790025000	USD
CY2019Q4	frme	Securities Pledged As Collateral SecuritiesPledgedAsCollateral	503427000	USD
CY2018Q4	frme	Securities Pledged As Collateral SecuritiesPledgedAsCollateral	416155000	USD
CY2017Q4	frme	Securities Pledged As Collateral SecuritiesPledgedAsCollateral	475999000	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	182856000	USD
CY2018Q4	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	116691000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	4415000	USD
CY2018	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	4269000	USD
CY2017	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	2681000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	USD
CY2018	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	USD
CY2017	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	50000	USD
CY2019Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	9037000	USD
CY2018Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	4778000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	8459310000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	7224467000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	80284000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	80552000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	8379026000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	7143915000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	80284000	USD
CY2019	us-gaap	Allowance For Loan And Lease Losses Period Increase Decrease AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease	268000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	80552000	USD
CY2019	us-gaap	Allowance For Loan And Lease Losses Writeoffs Net AllowanceForLoanAndLeaseLossesWriteoffsNet	3068000	USD
CY2019	frme	Allowance For Loan And Lease Losses Write Offs Net Period Increase Decrease AllowanceForLoanAndLeaseLossesWriteOffsNetPeriodIncreaseDecrease	1361000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	2800000	USD
CY2019	frme	Provisionfor Loan Leaseand Other Losses Period Increase Decrease ProvisionforLoanLeaseandOtherLossesPeriodIncreaseDecrease	4427000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	80552000	USD
CY2019	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	2800000	USD
CY2019	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	3553000	USD
CY2019	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	6621000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	80284000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	75032000	USD
CY2018	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	7227000	USD
CY2018	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	6276000	USD
CY2018	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	7983000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	80552000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	66037000	USD
CY2017	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	9143000	USD
CY2017	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	4880000	USD
CY2017	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	5028000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	75032000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	689000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	79595000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	80284000	USD
CY2019Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	11709000	USD
CY2019Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	8434292000	USD
CY2019Q4	frme	Loans And Leases Receivable LoansAndLeasesReceivable	8459310000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	1872000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	78680000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	80552000	USD
CY2018Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	22025000	USD
CY2018Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	7186658000	USD
CY2018Q4	frme	Loans And Leases Receivable LoansAndLeasesReceivable	7224467000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	15949000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	26148000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	9955000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	7352000	USD
CY2019	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	7924000	USD
CY2019	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	159000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	5139000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	4357000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	689000	USD
CY2019	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	4405000	USD
CY2019	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	75000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	15094000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	11709000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	689000	USD
CY2019	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	12329000	USD
CY2019	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	234000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	14555000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	11594000	USD
CY2018	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	15824000	USD
CY2018	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	168000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	10501000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	10431000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	1872000	USD
CY2018	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	10448000	USD
CY2018	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	68000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	25056000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	22025000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	1872000	USD
CY2018	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	26272000	USD
CY2018	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	236000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	25979000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	17931000	USD
CY2017	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	22752000	USD
CY2017	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	360000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	6123000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	5280000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	1637000	USD
CY2017	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	6135000	USD
CY2017	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	39000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	32102000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	23211000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	1637000	USD
CY2017	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	28887000	USD
CY2017	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	399000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	8459310000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	7224467000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	8427414000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	69000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	15949000	USD
CY2019Q4	frme	Financing Receivable Recorded Investment Past Due And Non Accrual FinancingReceivableRecordedInvestmentPastDueAndNonAccrual	31896000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	8459310000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	7186609000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	1855000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	26148000	USD
CY2018Q4	frme	Financing Receivable Recorded Investment Past Due And Non Accrual FinancingReceivableRecordedInvestmentPastDueAndNonAccrual	37858000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	7224467000	USD
CY2019	frme	Financing Receivable Modifications Pre Modification Recorded Investment During Period FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod	692000	USD
CY2019	frme	Financing Receivable Modifications Post Modification Recorded Investment During Period FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod	690000	USD
CY2019	frme	Financing Receivable Modifications Number Of Contracts During Period FinancingReceivableModificationsNumberOfContractsDuringPeriod	13	loan
CY2018	frme	Financing Receivable Modifications Pre Modification Recorded Investment During Period FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod	721000	USD
CY2018	frme	Financing Receivable Modifications Post Modification Recorded Investment During Period FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod	719000	USD
CY2018	frme	Financing Receivable Modifications Number Of Contracts During Period FinancingReceivableModificationsNumberOfContractsDuringPeriod	18	loan
CY2019Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	675000	USD
CY2018Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	777000	USD
CY2019	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	1	loan
CY2019	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	37000	USD
CY2018	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	2	loan
CY2018	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	75000	USD
CY2017Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	2890000	USD
CY2018Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	2143000	USD
CY2016Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	3950000	USD
CY2019	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Additions CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions	576000	USD
CY2018	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Additions CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions	0	USD
CY2017	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Additions CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions	1608000	USD
CY2019	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	2387000	USD
CY2018	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	4118000	USD
CY2017	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	6749000	USD
CY2019	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference	1965000	USD
CY2018	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference	3387000	USD
CY2017	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference	4748000	USD
CY2019	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Disposals Of Loans CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans	165000	USD
CY2018	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Disposals Of Loans CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans	16000	USD
CY2017	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Disposals Of Loans CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldDisposalsOfLoans	667000	USD
CY2019Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	2132000	USD
CY2018Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	2143000	USD
CY2017Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	2890000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	311945000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	233626000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	198890000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	140206000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	113055000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	93420000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018Q4	us-gaap	Goodwill Goodwill	445355000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	445355000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	97844000	USD
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	0	USD
CY2019	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	719000	USD
CY2018	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	0	USD
CY2019Q4	us-gaap	Goodwill Goodwill	543918000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	445355000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	85869000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	85869000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	5429000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	5027000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	4827000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	4241000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	9451000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	34962000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	67434000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	61440000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	34962000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	24429000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5994000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6719000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5647000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	5987000	USD
CY2019Q4	frme	Operatingleaseassets Operatingleaseassets	20747000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	20747000	USD
CY2019Q4	frme	Operatingleaseliabilities Operatingleaseliabilities	21421000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	21421000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y10M24D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.034
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	3617000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	204000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	948000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	13000	USD
CY2019	us-gaap	Lease Cost LeaseCost	4756000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	3434000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	3157000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3033000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	2654000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	2585000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	10198000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	25061000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	3640000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	21421000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	3422000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	23529000	USD
CY2019Q4	us-gaap	Demand Deposit Accounts DemandDepositAccounts	5250568000	USD
CY2018Q4	us-gaap	Demand Deposit Accounts DemandDepositAccounts	3985178000	USD
CY2019Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	2896177000	USD
CY2018Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	2282701000	USD
CY2019Q4	frme	Certificates And Other Time Deposits Of100000 Or More CertificatesAndOtherTimeDepositsOf100000OrMore	736843000	USD
CY2018Q4	frme	Certificates And Other Time Deposits Of100000 Or More CertificatesAndOtherTimeDepositsOf100000OrMore	593592000	USD
CY2019Q4	frme	Other Certificates And Time Deposits OtherCertificatesAndTimeDeposits	741759000	USD
CY2018Q4	frme	Other Certificates And Time Deposits OtherCertificatesAndTimeDeposits	646682000	USD
CY2019Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	214609000	USD
CY2018Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	246440000	USD
CY2019Q4	us-gaap	Deposits Deposits	9839956000	USD
CY2018Q4	us-gaap	Deposits Deposits	7754593000	USD
CY2019Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	5100000000	USD
CY2018Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	3800000000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	1489274000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	118919000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	47731000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	24636000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	11934000	USD
CY2019Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	717000	USD
CY2019Q4	us-gaap	Time Deposits TimeDeposits	1693211000	USD
CY2019	us-gaap	Schedule Of Repurchase Agreements ScheduleOfRepurchaseAgreements	<div style="line-height:120%;text-align:left;font-size:8pt;"><span style="font-family:Arial;font-size:8pt;">The collateral pledged for all repurchase agreements that are accounted for as secured borrowings as of </span><span style="font-family:Arial;font-size:8pt;">December 31, 2019</span><span style="font-family:Arial;font-size:8pt;"> and </span><span style="font-family:Arial;font-size:8pt;">2018</span><span style="font-family:Arial;font-size:8pt;"> were:</span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="20"/></tr><tr><td style="width:46%;"/><td style="width:1%;"/><td style="width:8%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:8%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:8%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:8%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:8%;"/><td style="width:1%;"/></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td colspan="19" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:center;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;font-weight:bold;">December 31, 2019</span></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td colspan="19" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:center;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;font-weight:bold;">Remaining Contractual Maturity of the Agreements</span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;font-weight:bold;">Overnight and Continuous</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;font-weight:bold;">Up to 30 Days</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;font-weight:bold;">30-90 Days</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;font-weight:bold;">Greater Than 90 Days</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;font-weight:bold;">Total</span></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:36px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;">U.S. Government-sponsored mortgage-backed securities</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><span>178,732</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><span>—</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><span>7,672</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><span>1,542</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><span>187,946</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr></table></div></div><div style="line-height:120%;text-align:left;font-size:8pt;"><span style="font-family:inherit;font-size:8pt;"><br/></span></div><div style="line-height:120%;text-align:left;font-size:8pt;"><span style="font-family:inherit;font-size:8pt;"><br/></span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="20"/></tr><tr><td style="width:46%;"/><td style="width:1%;"/><td style="width:8%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:8%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:8%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:8%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:1%;"/><td style="width:8%;"/><td style="width:1%;"/></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td colspan="19" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:center;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;font-weight:bold;">December 31, 2018</span></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td colspan="19" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:center;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;font-weight:bold;">Remaining Contractual Maturity of the Agreements</span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;font-weight:bold;">Overnight and Continuous</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;font-weight:bold;">Up to 30 Days</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;font-weight:bold;">30-90 Days</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;font-weight:bold;">Greater Than 90 Days</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;font-weight:bold;">Total</span></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:36px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;">U.S. Government-sponsored mortgage-backed securities</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><span>104,883</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><span>1,014</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><span>7,615</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><span>—</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:6pt;"><span style="font-family:Arial;font-size:6pt;"><span>113,512</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr></table></div><span style="font-family:inherit;font-size:10pt;"><br/></span></div>
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	49296000	USD
CY2013Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	70000000	USD
CY2018Q4	us-gaap	Federal Funds Purchased FederalFundsPurchased	104000000	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	187946000	USD
CY2018Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	113512000	USD
CY2019Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	351072000	USD
CY2018Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	314986000	USD
CY2019Q4	us-gaap	Other Borrowings OtherBorrowings	138685000	USD
CY2018Q4	us-gaap	Other Borrowings OtherBorrowings	138463000	USD
CY2019Q4	us-gaap	Federal Funds Purchased FederalFundsPurchased	55000000	USD
CY2019Q4	frme	Federal Funds Purchased And Securities Sold Under Agreements To Repurchase And Long Term Debt FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseAndLongTermDebt	732703000	USD
CY2018Q4	frme	Federal Funds Purchased And Securities Sold Under Agreements To Repurchase And Long Term Debt FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseAndLongTermDebt	670961000	USD
CY2019Q4	us-gaap	Debt Instrument Unused Borrowing Capacity Amount DebtInstrumentUnusedBorrowingCapacityAmount	638668000	USD
CY2013Q4	frme	Private Debt Issuance Sale Numberof Institutional Investors PrivateDebtIssuanceSaleNumberofInstitutionalInvestors	4	investor
CY2019Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	28734000	USD
CY2019Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	42255000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	0	USD
CY2019	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	52436000	USD
CY2019	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	3140000	USD
CY2018	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-14870000	USD
CY2018	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	3018000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-17888000	USD
CY2018	frme	Tax Cutsand Jobs Act Reclassificationfrom Aoc Ito Retained Earnings Tax Effect TaxCutsandJobsActReclassificationfromAOCItoRetainedEarningsTaxEffect	-626000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	3140000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	3018000	USD
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	1667000	USD
CY2019Q4	us-gaap	Capital Capital	1400617000	USD
CY2019Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1429
CY2019Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	783946000	USD
CY2019Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800
CY2019Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	1255333000	USD
CY2019Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1281
CY2019Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	587960000	USD
CY2019Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0600
CY2019Q4	frme	Common Equity Tier One Risk Based Capital CommonEquityTierOneRiskBasedCapital	1188970000	USD
CY2019Q4	frme	Common Equity Tier One Risk Based Capitalto Risk Weighted Assets CommonEquityTierOneRiskBasedCapitaltoRiskWeightedAssets	0.1213
CY2019Q4	frme	Common Equity Tier One Risk Based Capital Requiredfor Capital Adequacy CommonEquityTierOneRiskBasedCapitalRequiredforCapitalAdequacy	440970000	USD
CY2019Q4	frme	Common Equity Tier One Risk Based Capital Requiredfor Capital Adequacyto Risk Weighted Assets CommonEquityTierOneRiskBasedCapitalRequiredforCapitalAdequacytoRiskWeightedAssets	0.0450
CY2019Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	1255333000	USD
CY2019Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.1054
CY2019Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	476383000	USD
CY2019Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400
CY2018Q4	us-gaap	Capital Capital	1177725000	USD
CY2018Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1461
CY2018Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	644871000	USD
CY2018Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800
CY2018Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	1032173000	USD
CY2018Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1280
CY2018Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	483653000	USD
CY2018Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0600
CY2018Q4	frme	Common Equity Tier One Risk Based Capital CommonEquityTierOneRiskBasedCapital	966032000	USD
CY2018Q4	frme	Common Equity Tier One Risk Based Capitalto Risk Weighted Assets CommonEquityTierOneRiskBasedCapitaltoRiskWeightedAssets	0.1198
CY2018Q4	frme	Common Equity Tier One Risk Based Capital Requiredfor Capital Adequacy CommonEquityTierOneRiskBasedCapitalRequiredforCapitalAdequacy	362740000	USD
CY2018Q4	frme	Common Equity Tier One Risk Based Capital Requiredfor Capital Adequacyto Risk Weighted Assets CommonEquityTierOneRiskBasedCapitalRequiredforCapitalAdequacytoRiskWeightedAssets	0.0450
CY2018Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	1032173000	USD
CY2018Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.1091
CY2018Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	378379000	USD
CY2018Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400
CY2019	frme	Dividends Available DividendsAvailable	189371000	USD
CY2019	frme	Dividend Reinvestment And Stock Purchase Plan Stockholder Maximum Amount Of Cash Payments Per Quarter Purchases Of Common Stock DividendReinvestmentAndStockPurchasePlanStockholderMaximumAmountOfCashPaymentsPerQuarterPurchasesOfCommonStock	5000	USD
CY2019Q4	frme	Unpaid Principal Balance Of Loans Serviced For Others UnpaidPrincipalBalanceOfLoansServicedForOthers	514294000	USD
CY2018Q4	frme	Unpaid Principal Balance Of Loans Serviced For Others UnpaidPrincipalBalanceOfLoansServicedForOthers	533386000	USD
CY2017Q4	frme	Unpaid Principal Balance Of Loans Serviced For Others UnpaidPrincipalBalanceOfLoansServicedForOthers	549618000	USD
CY2019	frme	Share Based Compensation Arrangements By Share Based Payment Award Percentage Of Market Price At Eligible Employees Granted Options To Purchase Shares ShareBasedCompensationArrangementsByShareBasedPaymentAwardPercentageOfMarketPriceAtEligibleEmployeesGrantedOptionsToPurchaseShares	0.85
CY2019	frme	Share Based Compensation Arrangements By Share Based Payment Award Percentage Of Market Price At Eligible Employees Granted Options To Purchase Shares ShareBasedCompensationArrangementsByShareBasedPaymentAwardPercentageOfMarketPriceAtEligibleEmployeesGrantedOptionsToPurchaseShares	0.85
CY2019	frme	Share Based Compensation Arrangements By Share Based Payment Award Percentage Of Market Price At Eligible Employees Granted Options To Purchase Shares ShareBasedCompensationArrangementsByShareBasedPaymentAwardPercentageOfMarketPriceAtEligibleEmployeesGrantedOptionsToPurchaseShares	0.85
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4115000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3592000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2827000	USD
CY2019	frme	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Annual Forfeiture Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAnnualForfeitureRate	0.017
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	433000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	644000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	935000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4115000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3592000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2827000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1276000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1276000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1883000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2839000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	2316000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	944000	USD
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	76300	shares
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	12.40
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	16950	shares
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	8.51
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	59350	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	13.51
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P2Y5M12D
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	1666694	USD
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	59350	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	13.51
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P2Y5M12D
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	1666694	USD
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	59350	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	13.51
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P2Y5M12D
CY2019Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	1666694	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	495000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1685000	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	144000	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1598000	USD
CY2019	frme	Defined Benefit Plan Plan Participants Employees Covered By Plan Percentage DefinedBenefitPlanPlanParticipantsEmployeesCoveredByPlanPercentage	0.10
CY2005Q1	frme	Defined Benefit Plan Minimum Participant Attained Age DefinedBenefitPlanMinimumParticipantAttainedAge	P55Y
CY2005Q1	frme	Defined Benefits Plan Minimum Requisite Service Period DefinedBenefitsPlanMinimumRequisiteServicePeriod	P10Y
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	73193000	USD
CY2019	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	12972000	USD
CY2018	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets	-3427000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	14520000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	76770000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	73193000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	73193000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	76736000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	85213000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	82157000	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	39000	USD
CY2018	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	8000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2975000	USD
CY2018	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2816000	USD
CY2019	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	-4007000	USD
CY2018	us-gaap	Defined Benefit Plan Actuarial Gain Loss DefinedBenefitPlanActuarialGainLoss	6129000	USD
CY2019	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	5145000	USD
CY2018	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	5659000	USD
CY2019	us-gaap	Defined Benefit Plan Business Combinations And Acquisitions Benefit Obligation DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation	1701000	USD
CY2018	us-gaap	Defined Benefit Plan Business Combinations And Acquisitions Benefit Obligation DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation	0	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	76770000	USD
CY2019	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	558000	USD
CY2018	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	609000	USD
CY2019	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	5145000	USD
CY2018	us-gaap	Defined Benefit Plan Plan Assets Benefits Paid DefinedBenefitPlanPlanAssetsBenefitsPaid	5659000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	85121000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	76736000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	8351000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	3543000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	3278000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	3855000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	13291000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	7024000	USD
CY2019Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	4940000	USD
CY2018Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	3481000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses After Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax	-9712000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses After Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax	-14111000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit After Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax	325000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit After Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax	409000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	10037000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	4940000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	3481000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	4940000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	3481000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	0	USD
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	0	USD
CY2019	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	39000	USD
CY2018	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	8000	USD
CY2017	us-gaap	Defined Benefit Plan Service Cost DefinedBenefitPlanServiceCost	10000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2975000	USD
CY2018	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	2816000	USD
CY2017	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	3353000	USD
CY2019	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	4414000	USD
CY2018	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	4891000	USD
CY2017	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets	4778000	USD
CY2019	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	87000	USD
CY2018	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	87000	USD
CY2017	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	90000	USD
CY2019	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-404000	USD
CY2018	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-287000	USD
CY2017	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	-1218000	USD
CY2019	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	0	USD
CY2018	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	0	USD
CY2017	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1	761000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-909000	USD
CY2018	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-1693000	USD
CY2017	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	654000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	1504000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	-87000	USD
CY2019	frme	Other Comprehensive Income Loss Defined Benefit Plan Amortization Cost Creditbefore Tax OtherComprehensiveIncomeLossDefinedBenefitPlanAmortizationCostCreditbeforeTax	-404000	USD
CY2018	frme	Other Comprehensive Income Loss Defined Benefit Plan Amortization Cost Creditbefore Tax OtherComprehensiveIncomeLossDefinedBenefitPlanAmortizationCostCreditbeforeTax	-287000	USD
CY2017	frme	Other Comprehensive Income Loss Defined Benefit Plan Amortization Cost Creditbefore Tax OtherComprehensiveIncomeLossDefinedBenefitPlanAmortizationCostCreditbeforeTax	-1979000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	-87000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-909000	USD
CY2018	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	-1693000	USD
CY2017	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	654000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	4552000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-2189000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	-90000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	-5043000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	1815000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	-3573000	USD
CY2019	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	-5952000	USD
CY2018	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	122000	USD
CY2017	us-gaap	Amount Recognized In Net Periodic Benefit Cost And Other Comprehensive Income Loss Before Tax AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax	-2919000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Gain Loss Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear	-208000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Gain Loss Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear	-432000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Gain Loss Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear	-830000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Prior Service Cost Credit Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear	87000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Prior Service Cost Credit Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear	87000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Prior Service Cost Credit Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear	87000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Amortization Next Fiscal Year DefinedBenefitPlanExpectedAmortizationNextFiscalYear	295000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Expected Amortization Next Fiscal Year DefinedBenefitPlanExpectedAmortizationNextFiscalYear	519000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Expected Amortization Next Fiscal Year DefinedBenefitPlanExpectedAmortizationNextFiscalYear	917000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0320
CY2018Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0430
CY2017Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0360
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0430
CY2018	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0360
CY2017	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0420
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0600
CY2018	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0600
CY2017	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0600
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	0	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	5662000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	5549000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	5547000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	5418000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	5241000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	24435000	USD
CY2019Q4	frme	Defined Benefit Plan Expected Future Benefit Payments Total DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal	51852000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2019Q4	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	1.000
CY2018Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.000
CY2018Q4	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	1.000
CY2019	frme	Defined Contribution Plan Requisite Service Period DefinedContributionPlanRequisiteServicePeriod	PT1000H
CY2019	frme	Defined Contribution Plan Employer Contribution Percentof Employees Gross Pay DefinedContributionPlanEmployerContributionPercentofEmployeesGrossPay	0.02
CY2019	frme	Defined Contribution Plan Vesting Period DefinedContributionPlanVestingPeriod	P5Y
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	4560000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	5114000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3691000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	40695000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	39509000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	46758000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	10124000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	8347000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	11127000	USD
CY2019	frme	Effective Income Tax Rate Reconciliation Deduction Sharebased Compensation Amount EffectiveIncomeTaxRateReconciliationDeductionSharebasedCompensationAmount	459000	USD
CY2018	frme	Effective Income Tax Rate Reconciliation Deduction Sharebased Compensation Amount EffectiveIncomeTaxRateReconciliationDeductionSharebasedCompensationAmount	622000	USD
CY2017	frme	Effective Income Tax Rate Reconciliation Deduction Sharebased Compensation Amount EffectiveIncomeTaxRateReconciliationDeductionSharebasedCompensationAmount	893000	USD
CY2019	frme	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Earnings Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsuranceEarningsAmount	953000	USD
CY2018	frme	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Earnings Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsuranceEarningsAmount	868000	USD
CY2017	frme	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Earnings Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsuranceEarningsAmount	2302000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	263000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	615000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	811000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	5120000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	429000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-58000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	779000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29325000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28999000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	37524000	USD
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.151
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.154
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.281
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	23938000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	23633000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	22001000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	422000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1842000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	4726000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	6723000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	9969000	USD
CY2019	us-gaap	Tax Cuts And Jobs Act Of2017 Change In Tax Rate Income Tax Expense Benefit TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit	0	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Change In Tax Rate Income Tax Expense Benefit TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Tax Cuts And Jobs Act Of2017 Change In Tax Rate Income Tax Expense Benefit TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit	5120000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	239000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-3199000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	434000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	29325000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28999000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	37524000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	19717000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	19785000	USD
CY2019Q4	frme	Deferred Tax Assets Tax Deferred Expense Loan Fees DeferredTaxAssetsTaxDeferredExpenseLoanFees	442000	USD
CY2018Q4	frme	Deferred Tax Assets Tax Deferred Expense Loan Fees DeferredTaxAssetsTaxDeferredExpenseLoanFees	749000	USD
CY2019Q4	frme	Deferred Tax Asset Loan And Securities DeferredTaxAssetLoanAndSecurities	0	USD
CY2018Q4	frme	Deferred Tax Asset Loan And Securities DeferredTaxAssetLoanAndSecurities	710000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	4436000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	2101000	USD
CY2019Q4	frme	Deferred Tax Assets Tax Deferred Expense Federal And State Income Tax Loss Carryforward And Credits DeferredTaxAssetsTaxDeferredExpenseFederalAndStateIncomeTaxLossCarryforwardAndCredits	6205000	USD
CY2018Q4	frme	Deferred Tax Assets Tax Deferred Expense Federal And State Income Tax Loss Carryforward And Credits DeferredTaxAssetsTaxDeferredExpenseFederalAndStateIncomeTaxLossCarryforwardAndCredits	6954000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	0	USD
CY2018Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	1686000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	3499000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2028000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	34013000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	5240000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	6966000	USD
CY2019	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	34299000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	6496000	USD
CY2019Q4	frme	Deferred Tax Liabilities Loans And Securities DeferredTaxLiabilitiesLoansAndSecurities	1192000	USD
CY2018Q4	frme	Deferred Tax Liabilities Loans And Securities DeferredTaxLiabilitiesLoansAndSecurities	0	USD
CY2019Q4	frme	Deferred Tax Liabilities Tax Deferred Expense Compensation And Benefits Pension And Other Employee Benefits DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefitsPensionAndOtherEmployeeBenefits	1556000	USD
CY2018Q4	frme	Deferred Tax Liabilities Tax Deferred Expense Compensation And Benefits Pension And Other Employee Benefits DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefitsPensionAndOtherEmployeeBenefits	566000	USD
CY2019Q4	frme	Deferred Tax Liabilities State Income Tax DeferredTaxLiabilitiesStateIncomeTax	778000	USD
CY2018Q4	frme	Deferred Tax Liabilities State Income Tax DeferredTaxLiabilitiesStateIncomeTax	791000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Unrealized Gains On Trading Securities DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities	10333000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Unrealized Gains On Trading Securities DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities	0	USD
CY2019Q4	frme	Deferred Tax Liabilities Gain On Fdic Modified Whole Bank Transaction DeferredTaxLiabilitiesGainOnFdicModifiedWholeBankTransaction	413000	USD
CY2018Q4	frme	Deferred Tax Liabilities Gain On Fdic Modified Whole Bank Transaction DeferredTaxLiabilitiesGainOnFdicModifiedWholeBankTransaction	487000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	6506000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	4271000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	26018000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	12611000	USD
CY2019Q4	frme	Net Deferred Tax Assets Before Valuation Allowance NetDeferredTaxAssetsBeforeValuationAllowance	8281000	USD
CY2018Q4	frme	Net Deferred Tax Assets Before Valuation Allowance NetDeferredTaxAssetsBeforeValuationAllowance	21402000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2018	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-6966000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	8281000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	21402000	USD
CY2019	frme	Increase Decreasein Deferred Tax Assets IncreaseDecreaseinDeferredTaxAssets	-13121000	USD
CY2019	frme	Increase Decreasein Deferred Tax Liability Availablefor Sale Securities IncreaseDecreaseinDeferredTaxLiabilityAvailableforSaleSecurities	12019000	USD
CY2019	frme	Increase Decreasein Deferred Tax Liabilities Financing Arrangements IncreaseDecreaseinDeferredTaxLiabilitiesFinancingArrangements	1902000	USD
CY2019	frme	Increase Decreasein Deferred Tax Assets Compensation And Benefits Employee Compensation IncreaseDecreaseinDeferredTaxAssetsCompensationAndBenefitsEmployeeCompensation	2336000	USD
CY2019Q4	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability Bad Debt Reserve For Tax Purposes Of Qualified Lender DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityBadDebtReserveForTaxPurposesOfQualifiedLender	5308000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	164460000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	51412133	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.20
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	159139000	USD
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	49262015	shares
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.23
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	96070000	USD
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	45181221	shares
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.13
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	149105	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	208908	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	221757	shares
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	164460000	USD
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	51561238	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.19
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	159139000	USD
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49470923	shares
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.22
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	96070000	USD
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45402978	shares
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.12
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2019Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	108813000	USD
CY2019Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	112639000	USD
CY2019Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	118132000	USD
CY2019Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	125821000	USD
CY2018Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	93620000	USD
CY2018Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	100871000	USD
CY2018Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	104800000	USD
CY2018Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	108653000	USD
CY2019Q1	us-gaap	Interest Expense InterestExpense	23947000	USD
CY2019Q2	us-gaap	Interest Expense InterestExpense	27361000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	29200000	USD
CY2019Q4	us-gaap	Interest Expense InterestExpense	28237000	USD
CY2018Q1	us-gaap	Interest Expense InterestExpense	13704000	USD
CY2018Q2	us-gaap	Interest Expense InterestExpense	16300000	USD
CY2018Q3	us-gaap	Interest Expense InterestExpense	18314000	USD
CY2018Q4	us-gaap	Interest Expense InterestExpense	20769000	USD
CY2019Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	84866000	USD
CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	85278000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	88932000	USD
CY2019Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	97584000	USD
CY2018Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	79916000	USD
CY2018Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	84571000	USD
CY2018Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	86486000	USD
CY2018Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	87884000	USD
CY2019Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	1200000	USD
CY2019Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	500000	USD
CY2019Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	600000	USD
CY2019Q4	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	500000	USD
CY2018Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	2500000	USD
CY2018Q2	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	1663000	USD
CY2018Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	1400000	USD
CY2018Q4	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	1664000	USD
CY2019Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	83666000	USD
CY2019Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	84778000	USD
CY2019Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	88332000	USD
CY2019Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	97084000	USD
CY2018Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	77416000	USD
CY2018Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	82908000	USD
CY2018Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	85086000	USD
CY2018Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	86220000	USD
CY2019Q1	us-gaap	Noninterest Income NoninterestIncome	18713000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	21614000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	22116000	USD
CY2019Q4	us-gaap	Noninterest Income NoninterestIncome	24245000	USD
CY2018Q1	us-gaap	Noninterest Income NoninterestIncome	19561000	USD
CY2018Q2	us-gaap	Noninterest Income NoninterestIncome	18191000	USD
CY2018Q3	us-gaap	Noninterest Income NoninterestIncome	19527000	USD
CY2018Q4	us-gaap	Noninterest Income NoninterestIncome	19180000	USD
CY2019Q1	us-gaap	Noninterest Expense NoninterestExpense	56621000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	57587000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	67354000	USD
CY2019Q4	us-gaap	Noninterest Expense NoninterestExpense	65201000	USD
CY2018Q1	us-gaap	Noninterest Expense NoninterestExpense	53687000	USD
CY2018Q2	us-gaap	Noninterest Expense NoninterestExpense	53504000	USD
CY2018Q3	us-gaap	Noninterest Expense NoninterestExpense	55022000	USD
CY2018Q4	us-gaap	Noninterest Expense NoninterestExpense	57738000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	45758000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	48805000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	43094000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	56128000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	43290000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	47595000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	49591000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	47662000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6941000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7749000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6337000	USD
CY2019Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8298000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6611000	USD
CY2018Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7961000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8478000	USD
CY2018Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5949000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	38817000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	41056000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	36757000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	47830000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	36679000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	39634000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	41113000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	41713000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.79
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.83
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.71
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.87
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.80
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.83
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.85
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.78
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.83
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.71
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.87
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.74
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.80
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.83
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.85
CY2019Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	49369024	shares
CY2019Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	49432167	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	51433227	shares
CY2019Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55348176	shares
CY2018Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	49192647	shares
CY2018Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	49252580	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	49286945	shares
CY2018Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	49314276	shares
CY2019Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49540844	shares
CY2019Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49549887	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	51569557	shares
CY2019Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55519953	shares
CY2018Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49427972	shares
CY2018Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49451406	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49492019	shares
CY2018Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49511233	shares

Files In Submission

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$FRME
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2019 Q4 Form 10-K Financial Statement

#000071253420000060 Filed on February 28, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FRME FIRST MERCHANTS CORP Stock $frme

2019 Q4 Form 10-K Financial Statement

#000071253420000060 Filed on February 28, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FRME
FIRST MERCHANTS CORP Stock $frme