$IBCP
INDEPENDENT BANK CORP /MI/ Stock $ibcp

$ibcp Overview Financials Valuation SEC Filings Company Website

2021 Form 10-K Financial Statement

#000114036122007951 Filed on March 04, 2022

Income Statement

Concept	2021	2020 Q4	2020
Revenue	$138.1M		$139.8M
YoY Change	-1.25%		-6.11%
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	$5.400M	$3.200M	$5.300M
YoY Change	1.89%	88.24%	1.92%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$8.315M		$16.22M
YoY Change	-48.73%		-38.45%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$77.31M	$21.07M	$69.48M
YoY Change	11.27%	22.29%	20.29%
Income Tax	$14.42M	$4.080M	$13.33M
% Of Pretax Income	18.65%	19.36%	19.18%
Net Earnings	$62.90M	$16.99M	$56.15M
YoY Change	12.01%	22.41%	20.93%
Net Earnings / Revenue	45.55%		40.16%
Basic Earnings Per Share	$2.91		$2.56
Diluted Earnings Per Share	$2.88	$768.1K	$2.53
COMMON SHARES
Basic Shares Outstanding	21.59M		21.98M
Diluted Shares Outstanding

Balance Sheet

Concept	2021	2020 Q4	2020
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents		$118.7M
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	$42.90M	$36.13M	$43.80M
YoY Change	-2.05%	-5.95%	-6.21%
Goodwill		$28.30M
YoY Change		0.0%
Intangibles		$4.306M
YoY Change		-19.15%
Long-Term Investments
YoY Change
Other Assets	$4.300M
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$4.705B	$4.204B	$4.204B
YoY Change	11.91%	17.93%	17.93%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$80.20M	$68.30M	$68.30M
YoY Change	17.42%	37.42%	37.42%
Deferred Revenue
YoY Change
Short-Term Debt			$0.00
YoY Change			-100.0%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$80.20M	$68.30M	$68.30M
YoY Change	17.42%	37.42%	37.42%
LONG-TERM LIABILITIES
Long-Term Debt	$79.00M	$78.80M	$78.80M
YoY Change	0.25%	99.49%	99.49%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$79.00M	$78.80M	$78.80M
YoY Change	0.25%	99.49%	99.49%
TOTAL LIABILITIES
Total Short-Term Liabilities	$80.20M	$68.30M	$68.30M
Total Long-Term Liabilities	$79.00M	$78.80M	$78.80M
Total Liabilities	$4.306B	$3.814B	$3.815B
YoY Change	12.89%	18.66%	18.67%
SHAREHOLDERS EQUITY
Retained Earnings		$40.15M
YoY Change		2391.93%
Common Stock		$339.4M
YoY Change		-3.69%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$398.5M	$389.5M	$389.5M
YoY Change
Total Liabilities & Shareholders Equity	$4.705B	$4.204B	$4.204B
YoY Change	11.91%	17.93%	17.93%

Cashflow Statement

Concept	2021	2020 Q4	2020
OPERATING ACTIVITIES
Net Income	$62.90M	$16.99M	$56.15M
YoY Change	12.01%	22.41%	20.93%
Depreciation, Depletion And Amortization	$5.400M	$3.200M	$5.300M
YoY Change	1.89%	88.24%	1.92%
Cash From Operating Activities	$110.2M	$20.50M	$58.68M
YoY Change	87.71%	-27.82%	70.14%
INVESTING ACTIVITIES
Capital Expenditures	$5.837M	-$1.800M	$4.383M
YoY Change	33.17%	-21.74%	-11.2%
Acquisitions
YoY Change
Other Investing Activities	-$557.2M	$18.80M	-$549.5M
YoY Change	1.4%	-139.0%	210.1%
Cash From Investing Activities	-$563.1M	$17.00M	-$553.9M
YoY Change	1.65%	-133.6%	204.09%
FINANCING ACTIVITIES
Cash Dividend Paid	$18.16M		$17.62M
YoY Change	3.05%		6.43%
Common Stock Issuance & Retirement, Net	$17.21M		$14.22M
YoY Change	21.05%		-45.32%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	443.7M	34.70M	548.6M
YoY Change	-19.13%	594.0%	284.4%
NET CHANGE
Cash From Operating Activities	110.2M	20.50M	58.68M
Cash From Investing Activities	-563.1M	17.00M	-553.9M
Cash From Financing Activities	443.7M	34.70M	548.6M
Net Change In Cash	-9.232M	72.20M	53.40M
YoY Change	-117.29%	-519.77%	-1180.99%
FREE CASH FLOW
Cash From Operating Activities	$110.2M	$20.50M	$58.68M
Capital Expenditures	$5.837M	-$1.800M	$4.383M
Free Cash Flow	$104.3M	$22.30M	$54.30M
YoY Change	92.11%	-27.36%	83.72%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	38-2032782
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	4200 East Beltline
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Grand Rapids
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0000039311
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	0-7818
CY2021	dei	Entity Registrant Name EntityRegistrantName	INDEPENDENT BANK CORPORATION
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MI
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	MI
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	49525
CY2021	dei	City Area Code CityAreaCode	616
CY2021	dei	Local Phone Number LocalPhoneNumber	527-5820
CY2021	dei	Security12b Title Security12bTitle	Common Stock, No Par Value
CY2021	dei	Trading Symbol TradingSymbol	IBCP
CY2021	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021Q2	dei	Entity Public Float EntityPublicFloat	460580409
CY2022Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	21196430
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0000039311
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssets
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherAssets
CY2020Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilities
CY2021Q4	us-gaap	Operating Lease Liability Statement Of Financial Position Extensible List OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#OtherLiabilities
CY2021	us-gaap	Open Tax Year OpenTaxYear	2018
CY2021	dei	Auditor Firm AuditorFirmId	173
CY2021	dei	Auditor Name AuditorName	Crowe LLP
CY2021	dei	Auditor Location AuditorLocation	South Bend, Indiana
CY2021Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	51069000
CY2020Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	56006000
CY2021Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	58404000
CY2020Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	62699000
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	109473000
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	118705000
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1412830000
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1072159000
CY2021Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	18427000
CY2020Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	18427000
CY2021Q4	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	55470000
CY2020Q4	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	92434000
CY2021Q4	ibcp	Loans Held For Sale Carried At Lower Of Cost Or Fair Value LoansHeldForSaleCarriedAtLowerOfCostOrFairValue	34811000
CY2020Q4	ibcp	Loans Held For Sale Carried At Lower Of Cost Or Fair Value LoansHeldForSaleCarriedAtLowerOfCostOrFairValue	0
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	2905045000
CY2020Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	2733678000
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	47252000
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	35429000
CY2020Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	1153473000
CY2021Q4	us-gaap	Notes Receivable Net NotesReceivableNet	2857793000
CY2020Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	2698249000
CY2021Q4	us-gaap	Foreclosed Assets ForeclosedAssets	245000
CY2020Q4	us-gaap	Foreclosed Assets ForeclosedAssets	766000
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	36404000
CY2021Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1897487000
CY2020Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1526465000
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	36127000
CY2021Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	55279000
CY2020Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	55180000
CY2021Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	26232000
CY2020Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	16904000
CY2021Q4	ibcp	Reciprocal Deposits ReciprocalDeposits	586626000
CY2020Q4	ibcp	Reciprocal Deposits ReciprocalDeposits	556185000
CY2021Q4	us-gaap	Interest Bearing Domestic Deposit Time Deposits InterestBearingDomesticDepositTimeDeposits	308438000
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	3336000
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	4306000
CY2021Q4	us-gaap	Goodwill Goodwill	28300000
CY2020Q4	us-gaap	Goodwill Goodwill	28300000
CY2021Q4	us-gaap	Other Assets OtherAssets	66140000
CY2020Q4	us-gaap	Other Assets OtherAssets	62456000
CY2021Q4	us-gaap	Assets Assets	4704740000
CY2020Q4	us-gaap	Assets Assets	4204013000
CY2021Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	1321601000
CY2020Q4	us-gaap	Interest Bearing Domestic Deposit Time Deposits InterestBearingDomesticDepositTimeDeposits	287402000
CY2021Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	2938000
CY2020Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	113830000
CY2021Q4	us-gaap	Deposits Deposits	4117090000
CY2020Q4	us-gaap	Deposits Deposits	3637355000
CY2021Q4	us-gaap	Other Borrowings OtherBorrowings	30009000
CY2020Q4	us-gaap	Other Borrowings OtherBorrowings	30012000
CY2021Q4	us-gaap	Subordinated Debt SubordinatedDebt	39357000
CY2020Q4	us-gaap	Subordinated Debt SubordinatedDebt	39281000
CY2021Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	39592000
CY2020Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	39524000
CY2021Q4	us-gaap	Other Liabilities OtherLiabilities	80208000
CY2020Q4	us-gaap	Other Liabilities OtherLiabilities	68319000
CY2021Q4	us-gaap	Liabilities Liabilities	4306256000
CY2020Q4	us-gaap	Liabilities Liabilities	3814491000
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2020Q4	us-gaap	Preferred Stock No Par Value PreferredStockNoParValue	0
CY2021Q4	us-gaap	Preferred Stock No Par Value PreferredStockNoParValue	0
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	200000
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	200000
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2021Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2021Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	0
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	0
CY2020Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2021Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	21171036
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	21171036
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	21853800
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	21853800
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	323401000
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	339353000
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	74582000
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	40145000
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	501000
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	10024000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	398484000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	389522000
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4704740000
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4204013000
CY2021	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	116644000
CY2020	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	123159000
CY2019	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	133883000
CY2021	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	14488000
CY2020	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	12655000
CY2019	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	11842000
CY2021	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	6102000
CY2020	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	2926000
CY2019	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	1342000
CY2021	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	846000
CY2020	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	1089000
CY2019	us-gaap	Other Interest And Dividend Income OtherInterestAndDividendIncome	1861000
CY2021	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	138080000
CY2020	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	139829000
CY2019	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	148928000
CY2021	us-gaap	Interest Expense Deposits InterestExpenseDeposits	4465000
CY2020	us-gaap	Interest Expense Deposits InterestExpenseDeposits	12666000
CY2019	us-gaap	Interest Expense Deposits InterestExpenseDeposits	23425000
CY2021	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	3850000
CY2020	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	3551000
CY2019	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	2922000
CY2021	us-gaap	Interest Expense InterestExpense	8315000
CY2020	us-gaap	Interest Expense InterestExpense	16217000
CY2019	us-gaap	Interest Expense InterestExpense	26347000
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	129765000
CY2020	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	123612000
CY2019	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	122581000
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-1928000
CY2020	ibcp	Provision For Credit Losses ProvisionForCreditLosses	12463000
CY2019	ibcp	Provision For Credit Losses ProvisionForCreditLosses	824000
CY2021	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	131693000
CY2020	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	111149000
CY2019	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	121757000
CY2021	ibcp	Interchange Income InterchangeIncome	14045000
CY2020	ibcp	Interchange Income InterchangeIncome	11230000
CY2019	ibcp	Interchange Income InterchangeIncome	10297000
CY2021	ibcp	Depositor Accounts Fees And Commissions DepositorAccountsFeesAndCommissions	10170000
CY2020	ibcp	Depositor Accounts Fees And Commissions DepositorAccountsFeesAndCommissions	8517000
CY2019	ibcp	Depositor Accounts Fees And Commissions DepositorAccountsFeesAndCommissions	11208000
CY2021	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	35880000
CY2020	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	62560000
CY2019	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	19978000
CY2021	us-gaap	Marketable Securities Gain Loss Excluding Other Than Temporary Impairments MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments	1411000
CY2020	us-gaap	Marketable Securities Gain Loss Excluding Other Than Temporary Impairments MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments	267000
CY2019	us-gaap	Marketable Securities Gain Loss Excluding Other Than Temporary Impairments MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments	307000
CY2021	ibcp	Mortgage Loan Servicing Income MortgageLoanServicingIncome	5745000
CY2020	ibcp	Mortgage Loan Servicing Income MortgageLoanServicingIncome	-9350000
CY2019	ibcp	Mortgage Loan Servicing Income MortgageLoanServicingIncome	-3336000
CY2021	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	9392000
CY2020	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	7521000
CY2019	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	9282000
CY2021	us-gaap	Noninterest Income NoninterestIncome	76643000
CY2020	us-gaap	Noninterest Income NoninterestIncome	80745000
CY2019	us-gaap	Noninterest Income NoninterestIncome	47736000
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	79969000
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	74781000
CY2019	us-gaap	Labor And Related Expense LaborAndRelatedExpense	67501000
CY2021	ibcp	Data Processing DataProcessing	10823000
CY2020	ibcp	Data Processing DataProcessing	8534000
CY2019	ibcp	Data Processing DataProcessing	8905000
CY2021	us-gaap	Occupancy Net OccupancyNet	8794000
CY2020	us-gaap	Occupancy Net OccupancyNet	8938000
CY2019	us-gaap	Occupancy Net OccupancyNet	9013000
CY2021	ibcp	Interchange Expense InterchangeExpense	4434000
CY2020	ibcp	Interchange Expense InterchangeExpense	3342000
CY2019	ibcp	Interchange Expense InterchangeExpense	3215000
CY2021	us-gaap	Equipment Expense EquipmentExpense	4172000
CY2020	us-gaap	Equipment Expense EquipmentExpense	4089000
CY2019	us-gaap	Equipment Expense EquipmentExpense	4113000
CY2021	ibcp	Loan And Collection LoanAndCollection	3172000
CY2020	ibcp	Loan And Collection LoanAndCollection	3037000
CY2019	ibcp	Loan And Collection LoanAndCollection	2685000
CY2021	us-gaap	Communication Communication	3080000
CY2020	us-gaap	Communication Communication	3194000
CY2019	us-gaap	Communication Communication	2947000
CY2021	us-gaap	Professional Fees ProfessionalFees	2068000
CY2020	us-gaap	Professional Fees ProfessionalFees	2027000
CY2019	us-gaap	Professional Fees ProfessionalFees	1814000
CY2021	us-gaap	Advertising Expense AdvertisingExpense	1918000
CY2020	us-gaap	Advertising Expense AdvertisingExpense	2230000
CY2019	us-gaap	Advertising Expense AdvertisingExpense	2450000
CY2021	ibcp	Conversion Related Expense ConversionRelatedExpense	1827000
CY2020	ibcp	Conversion Related Expense ConversionRelatedExpense	2586000
CY2019	ibcp	Conversion Related Expense ConversionRelatedExpense	0
CY2021	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1396000
CY2020	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1596000
CY2019	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	685000
CY2021	ibcp	Costs Related To Unfunded Lending Commitments CostsRelatedToUnfundedLendingCommitments	1207000
CY2020	ibcp	Costs Related To Unfunded Lending Commitments CostsRelatedToUnfundedLendingCommitments	263000
CY2019	ibcp	Costs Related To Unfunded Lending Commitments CostsRelatedToUnfundedLendingCommitments	246000
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	8163000
CY2020	us-gaap	Other Noninterest Expense OtherNoninterestExpense	7796000
CY2019	us-gaap	Other Noninterest Expense OtherNoninterestExpense	8159000
CY2021	us-gaap	Noninterest Expense NoninterestExpense	131023000
CY2020	us-gaap	Noninterest Expense NoninterestExpense	122413000
CY2019	us-gaap	Noninterest Expense NoninterestExpense	111733000
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	77313000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	69481000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	57760000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14418000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13329000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11325000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	62895000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	56152000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	46435000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.91
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.56
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.03
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.88
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.53
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.00
CY2021	us-gaap	Net Income Loss NetIncomeLoss	62895000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	56152000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	46435000
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-10644000
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	15611000
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	10235000
CY2021	ibcp	Other Comprehensive Income Loss Available For Sale Securities Other Than Temporary Impairment Loss Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesOtherThanTemporaryImpairmentLossAdjustmentBeforeReclassificationAdjustmentsAndTax	0
CY2020	ibcp	Other Comprehensive Income Loss Available For Sale Securities Other Than Temporary Impairment Loss Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesOtherThanTemporaryImpairmentLossAdjustmentBeforeReclassificationAdjustmentsAndTax	-49000
CY2019	ibcp	Other Comprehensive Income Loss Available For Sale Securities Other Than Temporary Impairment Loss Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesOtherThanTemporaryImpairmentLossAdjustmentBeforeReclassificationAdjustmentsAndTax	-65000
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	1411000
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	267000
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	140000
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-12055000
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	15295000
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	10030000
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-2532000
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	3212000
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	2106000
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-9523000
CY2020	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	12083000
CY2019	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	7924000
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	0
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-354000
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-1603000
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	0
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-2539000
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	425000
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent	0
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent	2185000
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTaxParent	-2028000
CY2021	us-gaap	Other Comprehensive Income Loss Derivative Excluded Component Increase Decrease Adjustments Tax OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsTax	0
CY2020	us-gaap	Other Comprehensive Income Loss Derivative Excluded Component Increase Decrease Adjustments Tax OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsTax	-458000
CY2019	us-gaap	Other Comprehensive Income Loss Derivative Excluded Component Increase Decrease Adjustments Tax OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsTax	426000
CY2021	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	0
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	1727000
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-1602000
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-9523000
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	13810000
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	6322000
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	53372000
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	69962000
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	52757000
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	338994000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	46435000
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.72
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	16554000
CY2019	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	1204688
CY2019	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	26284000
CY2019	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	71799
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	284000
CY2019	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	92275
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1854000
CY2019	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	57468
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	882000
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	6322000
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	350169000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	56152000
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.80
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	17618000
CY2020	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	708956
CY2020	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	14231000
CY2020	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	17317
CY2020	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	15000
CY2020	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	103429
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1980000
CY2020	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	39633
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	755000
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	13810000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	389522000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	62895000
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.84
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	18155000
CY2021	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	814910
CY2021	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	17269000
CY2021	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	40350
CY2021	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	61000
CY2021	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	128018
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	1947000
CY2021	us-gaap	Shares Paid For Tax Withholding For Share Based Compensation SharesPaidForTaxWithholdingForShareBasedCompensation	36222
CY2021	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	691000
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-9523000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	398484000
CY2021	us-gaap	Net Income Loss NetIncomeLoss	62895000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	56152000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	46435000
CY2021	ibcp	Proceeds From Sale Of Equity Securities ProceedsFromSaleOfEquitySecurities	0
CY2020	ibcp	Proceeds From Sale Of Equity Securities ProceedsFromSaleOfEquitySecurities	0
CY2019	ibcp	Proceeds From Sale Of Equity Securities ProceedsFromSaleOfEquitySecurities	560000
CY2021	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	1283741000
CY2020	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	1478908000
CY2019	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	642537000
CY2021	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	1210897000
CY2020	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	1438982000
CY2019	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	647606000
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-1928000
CY2020	ibcp	Provision For Credit Losses ProvisionForCreditLosses	12463000
CY2020	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	2130000
CY2019	ibcp	Provision For Credit Losses ProvisionForCreditLosses	824000
CY2021	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-1912000
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-1088000
CY2021	us-gaap	Increase Decrease In Loans Deferred Income IncreaseDecreaseInLoansDeferredIncome	7857000
CY2020	us-gaap	Increase Decrease In Loans Deferred Income IncreaseDecreaseInLoansDeferredIncome	-1686000
CY2019	us-gaap	Increase Decrease In Loans Deferred Income IncreaseDecreaseInLoansDeferredIncome	2936000
CY2021	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	12130000
CY2020	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	9161000
CY2019	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	6059000
CY2021	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	35880000
CY2020	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	62560000
CY2019	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	19978000
CY2021	us-gaap	Marketable Securities Gain Loss Excluding Other Than Temporary Impairments MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments	1411000
CY2020	us-gaap	Marketable Securities Gain Loss Excluding Other Than Temporary Impairments MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments	267000
CY2019	us-gaap	Marketable Securities Gain Loss Excluding Other Than Temporary Impairments MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments	307000
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	1947000
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	1980000
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	1854000
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	11669000
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	7966000
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	6061000
CY2021	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	17171000
CY2020	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	10239000
CY2019	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	12023000
CY2021	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	47259000
CY2020	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	2532000
CY2019	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	-11943000
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	110154000
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	58684000
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	34492000
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	85371000
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	38095000
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	68716000
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	375723000
CY2020	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	306691000
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	153938000
CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	824348000
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	859068000
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	237672000
CY2021	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	0
CY2020	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	350000
CY2019	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	250000
CY2021	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	0
CY2020	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	68000
CY2019	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	0
CY2021	ibcp	Net Increase Decrease Of Portfolio Loans Originated Net Of Principal Payments NetIncreaseDecreaseOfPortfolioLoansOriginatedNetOfPrincipalPayments	205539000
CY2020	ibcp	Net Increase Decrease Of Portfolio Loans Originated Net Of Principal Payments NetIncreaseDecreaseOfPortfolioLoansOriginatedNetOfPrincipalPayments	41861000
CY2019	ibcp	Net Increase Decrease Of Portfolio Loans Originated Net Of Principal Payments NetIncreaseDecreaseOfPortfolioLoansOriginatedNetOfPrincipalPayments	215276000
CY2021	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	10032000
CY2020	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	2395000
CY2019	us-gaap	Proceeds From Sale Of Loans Held For Investment ProceedsFromSaleOfLoansHeldForInvestment	50516000
CY2021	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	1004000
CY2021	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	100000000
CY2020	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	239254000
CY2019	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	111000000
CY2020	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	1367000
CY2019	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	1766000
CY2021	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	467000
CY2020	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1441000
CY2019	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	470000
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	63000
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1133000
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	74000
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5837000
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	4383000
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	4936000
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-563064000
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-553908000
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-182154000
CY2021	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	479735000
CY2020	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	600628000
CY2019	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	123299000
CY2021	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-3000
CY2020	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	-24994000
CY2019	us-gaap	Proceeds From Repayments Of Other Debt ProceedsFromRepaymentsOfOtherDebt	25002000
CY2021	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	100000000
CY2020	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	272910000
CY2019	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	73143000
CY2021	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0
CY2020	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	39236000
CY2019	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	18155000
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	17618000
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	16554000
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	61000
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	15000
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	284000
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	17269000
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	14231000
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	26284000
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	691000
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	755000
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	882000
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	443678000
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	548625000
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	142722000
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-9232000
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	53401000
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	283000
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1587000
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	9906000
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-4940000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	118705000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	65304000
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	70244000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	109473000
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	118705000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	65304000
CY2021	us-gaap	Interest Paid Net InterestPaidNet	8419000
CY2020	us-gaap	Interest Paid Net InterestPaidNet	16912000
CY2019	us-gaap	Interest Paid Net InterestPaidNet	26697000
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	14059000
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	15500000
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	9534000
CY2021	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	253000
CY2020	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	332000
CY2019	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	2242000
CY2021	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	34811000
CY2020	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	0
CY2019	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	36622000
CY2021	ibcp	Securitization Of Portfolio Loans SecuritizationOfPortfolioLoans	0
CY2020	ibcp	Securitization Of Portfolio Loans SecuritizationOfPortfolioLoans	26324000
CY2019	ibcp	Securitization Of Portfolio Loans SecuritizationOfPortfolioLoans	65070000
CY2021	ibcp	Purchase Of Securities Available For Sale Not Yet Settled PurchaseOfSecuritiesAvailableForSaleNotYetSettled	0
CY2020	ibcp	Purchase Of Securities Available For Sale Not Yet Settled PurchaseOfSecuritiesAvailableForSaleNotYetSettled	1000000
CY2019	ibcp	Purchase Of Securities Available For Sale Not Yet Settled PurchaseOfSecuritiesAvailableForSaleNotYetSettled	0
CY2021Q4	ibcp	Percentage Of Loan Portfolio Secured By Real Estate PercentageOfLoanPortfolioSecuredByRealEstate	0.690
CY2020Q1	ibcp	Average Reserve Balances To Be Maintained AverageReserveBalancesToBeMaintained	0
CY2021	ibcp	Average Reserve Balances To Be Maintained AverageReserveBalancesToBeMaintained	0
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1
CY2021	ibcp	Mortgage Loan Servicing Fees MortgageLoanServicingFees	7900000
CY2020	ibcp	Mortgage Loan Servicing Fees MortgageLoanServicingFees	6900000
CY2019	ibcp	Mortgage Loan Servicing Fees MortgageLoanServicingFees	6200000
CY2021	us-gaap	Revenue Recognition Interest RevenueRecognitionInterest	<div style="display:none;"><br/></div> <div style="text-align: justify; text-indent: 18pt; font-family: 'Times New Roman', Times, serif; font-size: 10pt;"><span style="font-size: 10pt; font-family: 'Times New Roman', Times, serif; font-style: italic;">LOAN REVENUE RECOGNITION </span>— Interest on loans is accrued based on the principal amounts outstanding. In general, the accrual of interest income is discontinued when a loan becomes 90 days past due for commercial loans and installment loans and when a loan misses four consecutive payments for mortgage loans and the borrower’s capacity to repay the loan and collateral values appear insufficient for each loan class. However, loans may be placed on non-accrual status regardless of whether or not such loans are considered past due if, in management’s opinion, the borrower is unable to meet payment obligations as they become due or as required by regulatory provisions. All interest accrued but not received for all loans placed on non-accrual is reversed from interest income. Payments on such loans are generally applied to the principal balance until qualifying to be returned to accrual status. A non-accrual loan may be restored to accrual status when interest and principal payments are current and the loan appears otherwise collectible. Delinquency status for all classes in the commercial and installment loan portfolio segments is based on the actual number of days past due as required by the contractual terms of the loan agreement while delinquency status for mortgage loan portfolio segment classes is based on the number of payments past due.</div> <div style="display:none;"><br/></div> <div style="text-align: justify; text-indent: 18pt;"><span style="font-size: 10pt; font-family: 'Times New Roman', Times, serif;"> </span><br/> </div> <div style="display:none;"><br/></div> <div style="text-align: justify; font-family: 'Times New Roman',Times,serif; font-size: 10pt; text-indent: 18pt;">Certain loan fees and direct loan origination costs are deferred and recognized as an adjustment of yield generally over the contractual life of the related loan. Fees received in connection with loan commitments are deferred until the loan is advanced and are then recognized generally over the contractual life of the loan as an adjustment of yield. Fees on commitments that expire unused are recognized at expiration. Fees received for letters of credit are recognized as revenue over the life of the commitment.</div>
CY2021	ibcp	Number Of Past Due Days For Commercial Loan Installment Loans And Payment Plan Receivables NumberOfPastDueDaysForCommercialLoanInstallmentLoansAndPaymentPlanReceivables	P90D
CY2021Q4	ibcp	Number Of Consecutive Payments For Mortgage Loans Misses NumberOfConsecutivePaymentsForMortgageLoansMisses	4
CY2021Q4	ibcp	Group Flexible Premium Non Participating Variable Life Insurance Contract GroupFlexiblePremiumNonParticipatingVariableLifeInsuranceContract	260
CY2020	ibcp	Average Reserve Balances To Be Maintained AverageReserveBalancesToBeMaintained	9200000
CY2021	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="display:none;"><br/></div> <div style="text-align: justify; text-indent: 18pt; font-family: 'Times New Roman', Times, serif; font-size: 10pt;"><span style="font-size: 10pt; font-family: 'Times New Roman', Times, serif; font-style: italic;">RECLASSIFICATION </span>— Certain amounts in the 2020 and 2019 consolidated financial statements have been reclassified to conform to the 2021 presentation.</div>
CY2021Q4	ibcp	Reserve Balances Maintained At Other Financial Institutions ReserveBalancesMaintainedAtOtherFinancialInstitutions	0
CY2020Q4	ibcp	Reserve Balances Maintained At Other Financial Institutions ReserveBalancesMaintainedAtOtherFinancialInstitutions	740000
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1404858000
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	16594000
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	8622000
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1412830000
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1052132000
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	21431000
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1404000
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1072159000
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	607923000
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	8077000
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	33530000
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	545000
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	641453000
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	8622000
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	148169000
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	989000
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	28257000
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	415000
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	176426000
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1404000
CY2021Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0
CY2021Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	6000000.0
CY2019	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	0
CY2021	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	0
CY2020	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	0
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	13874000
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	13991000
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	133681000
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	134901000
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	266057000
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	266282000
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	340558000
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	347960000
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	754170000
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	763134000
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	309907000
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	307985000
CY2021Q4	ibcp	Government Agency Commercial Mortgage Backed Without Single Maturity Date Amortized Cost Basis GovernmentAgencyCommercialMortgageBackedWithoutSingleMaturityDateAmortizedCostBasis	23066000
CY2021Q4	ibcp	Government Agency Commercial Mortgage Backed Debt Maturities Without Single Maturity Date Fair Value GovernmentAgencyCommercialMortgageBackedDebtMaturitiesWithoutSingleMaturityDateFairValue	22926000
CY2021Q4	ibcp	Private Label Mortgage Backed Without Single Maturity Date Amortized Cost Basis PrivateLabelMortgageBackedWithoutSingleMaturityDateAmortizedCostBasis	102480000
CY2021Q4	ibcp	Private Label Mortgage Backed Debt Maturities Without Single Maturity Date Fair Value PrivateLabelMortgageBackedDebtMaturitiesWithoutSingleMaturityDateFairValue	102615000
CY2021Q4	ibcp	Other Asset Backed Without Single Maturity Date Amortized Cost Basis OtherAssetBackedWithoutSingleMaturityDateAmortizedCostBasis	215235000
CY2021Q4	ibcp	Other Asset Backed Debt Maturities Without Single Maturity Date Fair Value OtherAssetBackedDebtMaturitiesWithoutSingleMaturityDateFairValue	216170000
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1404858000
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1412830000
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	85371000
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	1475000
CY2021	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	64000
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	38095000
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	271000
CY2020	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	4000
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	68716000
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	248000
CY2019	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	108000
CY2019	us-gaap	Trading Securities Realized Gain Loss TradingSecuritiesRealizedGainLoss	170000
CY2021Q4	ibcp	Book Value Of Pledged Securities BookValueOfPledgedSecurities	10500000
CY2020Q4	ibcp	Book Value Of Pledged Securities BookValueOfPledgedSecurities	14000000.0
CY2020Q4	ibcp	State And Political Subdivision Shareholders Equity Threshold StateAndPoliticalSubdivisionShareholdersEquityThreshold	0.10
CY2021Q4	ibcp	State And Political Subdivision Shareholders Equity Threshold StateAndPoliticalSubdivisionShareholdersEquityThreshold	0.10
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	2905045000
CY2020Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	2733678000
CY2021Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	22400000
CY2020Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	14600000
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	35429000
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-1928000
CY2021	us-gaap	Financing Receivable Allowance For Credit Loss Purchased With Credit Deterioration Increase FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	134000
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	4477000
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	2434000
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	47252000
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	26148000
CY2020	ibcp	Provision For Credit Losses ProvisionForCreditLosses	12463000
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	3069000
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	6251000
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	35429000
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	24888000
CY2019	ibcp	Provision For Credit Losses ProvisionForCreditLosses	824000
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	3961000
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3525000
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	26148000
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	47252000
CY2021Q4	ibcp	Financing Receivable Percentage Of Loans To Portfolio Loans FinancingReceivablePercentageOfLoansToPortfolioLoans	1.000
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	35429000
CY2020Q4	ibcp	Financing Receivable Percentage Of Loans To Portfolio Loans FinancingReceivablePercentageOfLoansToPortfolioLoans	1.000
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	5581000
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	29848000
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	35429000
CY2020Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	50672000
CY2020Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	2690880000
CY2020Q4	ibcp	Loans And Leases Receivable Recorded Investment LoansAndLeasesReceivableRecordedInvestment	2742577000
CY2020Q4	us-gaap	Interest Receivable InterestReceivable	8899000
CY2020Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	2733678000
CY2021	ibcp	Non Performing Loan Interest Income NonPerformingLoanInterestIncome	200000
CY2020	ibcp	Non Performing Loan Interest Income NonPerformingLoanInterestIncome	500000
CY2019	ibcp	Non Performing Loan Interest Income NonPerformingLoanInterestIncome	400000
CY2020	ibcp	Non Performing Loan Interest Income Recorded NonPerformingLoanInterestIncomeRecorded	0
CY2021	ibcp	Non Performing Loan Interest Income Recorded NonPerformingLoanInterestIncomeRecorded	0
CY2019	ibcp	Non Performing Loan Interest Income Recorded NonPerformingLoanInterestIncomeRecorded	0
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	2905045000
CY2021Q4	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	6836000
CY2020Q4	ibcp	Loans And Leases Receivable Recorded Investment LoansAndLeasesReceivableRecordedInvestment	2742577000
CY2020Q4	us-gaap	Interest Receivable InterestReceivable	8899000
CY2020Q4	ibcp	Troubled Debt Restructuring Amount TroubledDebtRestructuringAmount	93000
CY2020Q4	ibcp	Non Troubled Debt Restructuring Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance NonTroubledDebtRestructuringImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	1367000
CY2020Q4	ibcp	Troubled Debt Restructuring Allowances Based On Collateral TroubledDebtRestructuringAllowancesBasedOnCollateral	9027000
CY2020Q4	ibcp	Troubled Debt Restructuring Allowances Based On Present Value Cash Flow TroubledDebtRestructuringAllowancesBasedOnPresentValueCashFlow	37953000
CY2020Q4	ibcp	Non Troubled Debt Restructuring Allowance Based On Collateral NonTroubledDebtRestructuringAllowanceBasedOnCollateral	1873000
CY2020Q4	ibcp	Impaired Financing Receivables ImpairedFinancingReceivables	50313000
CY2020Q4	ibcp	Troubled Debt Restructuring Allowance Based On Collateral TroubledDebtRestructuringAllowanceBasedOnCollateral	1058000
CY2020Q4	ibcp	Troubled Debt Restructuring Allowance Based On Present Value Cash Flow TroubledDebtRestructuringAllowanceBasedOnPresentValueCashFlow	3755000
CY2020Q4	ibcp	Accrued Interest Impaired Loans AccruedInterestImpairedLoans	359000
CY2020Q4	ibcp	Non Troubled Debt Restructuring Allowances Based On Collateral NonTroubledDebtRestructuringAllowancesBasedOnCollateral	768000
CY2020	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	1724000
CY2020	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	23000
CY2019	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	789000
CY2019	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	13000
CY2020	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	55600000
CY2020	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	4828000
CY2019	us-gaap	Allowance For Loan And Lease Losses Period Increase Decrease AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease	500000
CY2019	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	0
CY2020	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	0
CY2021	ibcp	Past Due Period For Modified Loans PastDuePeriodForModifiedLoans	P90D
CY2021Q4	ibcp	Number Of Consecutive Payments For Mortgage Loans Misses NumberOfConsecutivePaymentsForMortgageLoansMisses	4
CY2020Q4	ibcp	Allowance For Loan Losses Allocated AllowanceForLoanLossesAllocated	5581000
CY2020Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	1460000
CY2020Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	1865000
CY2020Q4	ibcp	Impaired Financing Receivable Related Allowance With No Related Allowance ImpairedFinancingReceivableRelatedAllowanceWithNoRelatedAllowance	0
CY2020Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	49212000
CY2020Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	51105000
CY2020Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	5581000
CY2020Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	50672000
CY2020Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	52970000
CY2020Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	5581000
CY2019	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	55428000
CY2019	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	2978000
CY2020	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	57324000
CY2020	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	4851000
CY2019	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	56217000
CY2019	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	2991000
CY2021Q4	ibcp	Troubled Debt Restructuring TroubledDebtRestructuring	37086000
CY2020Q4	ibcp	Troubled Debt Restructuring TroubledDebtRestructuring	47073000
CY2021	ibcp	Number Of Consecutive Timely Payments Required NumberOfConsecutiveTimelyPaymentsRequired	6
CY2021Q4	ibcp	Troubled Debt Restructuring Loans And Leases Receivable Specific Allowance TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowance	3600000
CY2020Q4	ibcp	Troubled Debt Restructuring Loans And Leases Receivable Specific Allowance TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowance	4800000
CY2021Q4	ibcp	Additional Amounts Committed To Lend As Troubled Debt Restructurings AdditionalAmountsCommittedToLendAsTroubledDebtRestructurings	40000.00
CY2020Q4	ibcp	Additional Amounts Committed To Lend As Troubled Debt Restructurings AdditionalAmountsCommittedToLendAsTroubledDebtRestructurings	70000.00
CY2020	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	24
CY2020	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	8822000
CY2020	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	8848000
CY2019	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	24
CY2019	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	4336000
CY2019	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	4342000
CY2021	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	0
CY2020	us-gaap	Allowance For Loan And Lease Losses Period Increase Decrease AllowanceForLoanAndLeaseLossesPeriodIncreaseDecrease	40000.00
CY2020	ibcp	Allowance For Doubtful Accounts Receivable Charge Offs Due To Tdr AllowanceForDoubtfulAccountsReceivableChargeOffsDueToTDR	0
CY2021	ibcp	Allowance For Doubtful Accounts Receivable Charge Offs Due To Tdr AllowanceForDoubtfulAccountsReceivableChargeOffsDueToTDR	0
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	0
CY2021	ibcp	Loan Modification Term Of Interest Only Period LoanModificationTermOfInterestOnlyPeriod	P3M
CY2021	ibcp	Loan Modification Term Of Suspended Payments LoanModificationTermOfSuspendedPayments	P3M
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	2905045000
CY2021	ibcp	Financing Receivable Modifications By Other Than Troubled Debt Restructuring Percentage Of Loans Modified FinancingReceivableModificationsByOtherThanTroubledDebtRestructuringPercentageOfLoansModified	0.001
CY2021Q4	ibcp	Principal Amount Outstanding On Loans Serviced For Others PrincipalAmountOutstandingOnLoansServicedForOthers	3323521000
CY2020Q4	ibcp	Principal Amount Outstanding On Loans Serviced For Others PrincipalAmountOutstandingOnLoansServicedForOthers	2984088000
CY2021Q4	us-gaap	Escrow Deposit EscrowDeposit	39400000
CY2020Q4	us-gaap	Escrow Deposit EscrowDeposit	40500000
CY2021Q4	ibcp	Maximum Number Of Consecutive Quarterly Losses Recorded For Profitability Requirement MaximumNumberOfConsecutiveQuarterlyLossesRecordedForProfitabilityRequirement	4
CY2021Q4	ibcp	Percentage Of Decline In Net Worth During Period PercentageOfDeclineInNetWorthDuringPeriod	0.30
CY2021Q4	ibcp	Maximum Percentage Of Decline In Net Worth For One Consecutive Quarter MaximumPercentageOfDeclineInNetWorthForOneConsecutiveQuarter	0.25
CY2021Q4	ibcp	Maximum Percentage Of Decline In Net Worth For Two Consecutive Quarters MaximumPercentageOfDeclineInNetWorthForTwoConsecutiveQuarters	0.40
CY2021	ibcp	Highest Level Of Capital Amount HighestLevelOfCapitalAmount	2500000
CY2021	ibcp	Highest Level Of Capital Amount Plus HighestLevelOfCapitalAmountPlus	0.0025
CY2020Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	16904000
CY2019Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	19171000
CY2018Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	21400000
CY2021	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	11436000
CY2020	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	13957000
CY2019	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	7303000
CY2021	ibcp	Servicing Asset At Fair Value Changes In Fair Value Due To Price ServicingAssetAtFairValueChangesInFairValueDueToPrice	3380000
CY2020	ibcp	Servicing Asset At Fair Value Changes In Fair Value Due To Price ServicingAssetAtFairValueChangesInFairValueDueToPrice	-10833000
CY2019	ibcp	Servicing Asset At Fair Value Changes In Fair Value Due To Price ServicingAssetAtFairValueChangesInFairValueDueToPrice	-6408000
CY2021	ibcp	Servicing Asset At Fair Value Changes In Pay Downs ServicingAssetAtFairValueChangesInPayDowns	-5488000
CY2019	ibcp	Servicing Asset At Fair Value Changes In Pay Downs ServicingAssetAtFairValueChangesInPayDowns	-3124000
CY2021Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	26232000
CY2020Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	16904000
CY2019Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	19171000
CY2020	ibcp	Servicing Asset At Fair Value Changes In Pay Downs ServicingAssetAtFairValueChangesInPayDowns	-5391000
CY2021Q4	ibcp	Mortgage Loans On Real Estate Serviced MortgageLoansOnRealEstateServiced	3323521000
CY2020Q4	ibcp	Mortgage Loans On Real Estate Serviced MortgageLoansOnRealEstateServiced	2982833000
CY2019Q4	ibcp	Mortgage Loans On Real Estate Serviced MortgageLoansOnRealEstateServiced	2580705000
CY2021	ibcp	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Average Coupon Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAverageCouponRate	0.0346
CY2021	ibcp	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Average Servicing Fee Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAverageServicingFeeRate	0.00256
CY2021	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.1007
CY2021	ibcp	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate Average Psa Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRateAveragePsaRate	232
CY2020	ibcp	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Average Coupon Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAverageCouponRate	0.0377
CY2020	ibcp	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Average Servicing Fee Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueAverageServicingFeeRate	0.00257
CY2020	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.1009
CY2020	ibcp	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate Average Psa Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRateAveragePsaRate	348
CY2020Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	738000
CY2019Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	1715000
CY2018Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	1178000
CY2021	ibcp	Other Real Estate Acquired Additions OtherRealEstateAcquiredAdditions	253000
CY2020	ibcp	Other Real Estate Acquired Additions OtherRealEstateAcquiredAdditions	332000
CY2019	ibcp	Other Real Estate Acquired Additions OtherRealEstateAcquiredAdditions	2242000
CY2021	ibcp	Other Real Estate Acquired Disposals OtherRealEstateAcquiredDisposals	745000
CY2020	ibcp	Other Real Estate Acquired Disposals OtherRealEstateAcquiredDisposals	1161000
CY2019	ibcp	Other Real Estate Acquired Disposals OtherRealEstateAcquiredDisposals	1438000
CY2021	ibcp	Other Real Estate Acquired Valuation Adjustments OtherRealEstateAcquiredValuationAdjustments	11000
CY2020	ibcp	Other Real Estate Acquired Valuation Adjustments OtherRealEstateAcquiredValuationAdjustments	148000
CY2019	ibcp	Other Real Estate Acquired Valuation Adjustments OtherRealEstateAcquiredValuationAdjustments	267000
CY2021Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	235000
CY2020Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	738000
CY2019Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	1715000
CY2021Q4	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	10000.00
CY2020Q4	us-gaap	Other Foreclosed Assets OtherForeclosedAssets	30000.00
CY2020Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	300000
CY2020Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	90000
CY2019Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	92000
CY2018Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	144000
CY2021	us-gaap	Real Estate Owned Valuation Allowance Provision1 RealEstateOwnedValuationAllowanceProvision1	11000
CY2020	us-gaap	Real Estate Owned Valuation Allowance Provision1 RealEstateOwnedValuationAllowanceProvision1	148000
CY2019	us-gaap	Real Estate Owned Valuation Allowance Provision1 RealEstateOwnedValuationAllowanceProvision1	267000
CY2021	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	70000
CY2020	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	150000
CY2019	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	319000
CY2021Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	31000
CY2020Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	90000
CY2019Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	92000
CY2021	ibcp	Foreclosed Residential Real Estate ForeclosedResidentialRealEstate	200000
CY2020	ibcp	Foreclosed Residential Real Estate ForeclosedResidentialRealEstate	700000
CY2021Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	600000
CY2021Q4	us-gaap	Foreclosed Assets ForeclosedAssets	200000
CY2020Q4	us-gaap	Foreclosed Assets ForeclosedAssets	800000
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	151010000
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	146833000
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	114606000
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	110706000
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	36404000
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	36127000
CY2021	us-gaap	Depreciation Depreciation	5400000
CY2020	us-gaap	Depreciation Depreciation	5300000
CY2019	us-gaap	Depreciation Depreciation	5200000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	11916000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	8580000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	11916000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	7610000
CY2021Q4	us-gaap	Goodwill Goodwill	28300000
CY2020Q4	us-gaap	Goodwill Goodwill	28300000
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1000000.0
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1000000.0
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1100000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	785000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	547000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	516000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	487000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	460000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	541000
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	3336000
CY2021	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	2101000
CY2020	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	2264000
CY2019	us-gaap	Interest Expense Now Accounts Money Market Accounts And Savings Deposits InterestExpenseNOWAccountsMoneyMarketAccountsAndSavingsDeposits	5371000
CY2021	ibcp	Interest Expense Deposit Liabilities Reciprocal Deposit InterestExpenseDepositLiabilitiesReciprocalDeposit	764000
CY2020	ibcp	Interest Expense Deposit Liabilities Reciprocal Deposit InterestExpenseDepositLiabilitiesReciprocalDeposit	2158000
CY2019	ibcp	Interest Expense Deposit Liabilities Reciprocal Deposit InterestExpenseDepositLiabilitiesReciprocalDeposit	6024000
CY2021	us-gaap	Interest Expense Domestic Deposit Liabilities Time Deposit InterestExpenseDomesticDepositLiabilitiesTimeDeposit	1507000
CY2020	us-gaap	Interest Expense Domestic Deposit Liabilities Time Deposit InterestExpenseDomesticDepositLiabilitiesTimeDeposit	7073000
CY2019	us-gaap	Interest Expense Domestic Deposit Liabilities Time Deposit InterestExpenseDomesticDepositLiabilitiesTimeDeposit	7148000
CY2021	us-gaap	Interest Expense Domestic Deposit Liabilities Brokered InterestExpenseDomesticDepositLiabilitiesBrokered	93000
CY2020	us-gaap	Interest Expense Domestic Deposit Liabilities Brokered InterestExpenseDomesticDepositLiabilitiesBrokered	1171000
CY2019	us-gaap	Interest Expense Domestic Deposit Liabilities Brokered InterestExpenseDomesticDepositLiabilitiesBrokered	4882000
CY2021	us-gaap	Interest Expense Deposits InterestExpenseDeposits	4465000
CY2020	us-gaap	Interest Expense Deposits InterestExpenseDeposits	12666000
CY2019	us-gaap	Interest Expense Deposits InterestExpenseDeposits	23425000
CY2021Q4	ibcp	Time Deposits Denominations Amount TimeDepositsDenominationsAmount	250000
CY2020Q4	ibcp	Time Deposits Denominations Amount TimeDepositsDenominationsAmount	250000
CY2021Q4	ibcp	Time Deposits250000 Or More TimeDeposits250000OrMore	93100000
CY2020Q4	ibcp	Time Deposits250000 Or More TimeDeposits250000OrMore	50000000.0
CY2021Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	269067000
CY2021Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	43692000
CY2021Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	10067000
CY2021Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	5834000
CY2021Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	6794000
CY2021Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	338000
CY2021Q4	us-gaap	Time Deposits TimeDeposits	335792000
CY2021Q4	ibcp	Reciprocal Demand Deposits ReciprocalDemandDeposits	559664000
CY2020Q4	ibcp	Reciprocal Demand Deposits ReciprocalDemandDeposits	515092000
CY2021Q4	ibcp	Reciprocal Money Market Deposits ReciprocalMoneyMarketDeposits	2546000
CY2020Q4	ibcp	Reciprocal Money Market Deposits ReciprocalMoneyMarketDeposits	3308000
CY2021Q4	ibcp	Reciprocal Time Deposits ReciprocalTimeDeposits	24416000
CY2020Q4	ibcp	Reciprocal Time Deposits ReciprocalTimeDeposits	37785000
CY2021Q4	ibcp	Reciprocal Deposits ReciprocalDeposits	586626000
CY2020Q4	ibcp	Reciprocal Deposits ReciprocalDeposits	556185000
CY2021Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	30000000
CY2020Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	30000000
CY2021Q4	ibcp	Borrowings Borrowings	9000
CY2020Q4	ibcp	Borrowings Borrowings	12000
CY2021Q4	us-gaap	Other Borrowings OtherBorrowings	30009000
CY2020Q4	us-gaap	Other Borrowings OtherBorrowings	30012000
CY2021Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	8600000
CY2021Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds	798400000
CY2021	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	200000
CY2020	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	500000
CY2019	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	700000
CY2019	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Repayment And Penalties FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresRepaymentAndPenalties	0
CY2021	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Repayment And Penalties FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresRepaymentAndPenalties	0
CY2020	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Repayment And Penalties FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresRepaymentAndPenalties	0
CY2021	ibcp	Federal Home Loan Bank Stock As Percentages Of Outstanding Advances FederalHomeLoanBankStockAsPercentagesOfOutstandingAdvances	0.045
CY2021	us-gaap	Interest Expense Federal Funds Purchased InterestExpenseFederalFundsPurchased	0
CY2020	us-gaap	Interest Expense Federal Funds Purchased InterestExpenseFederalFundsPurchased	10000.00
CY2019	us-gaap	Interest Expense Federal Funds Purchased InterestExpenseFederalFundsPurchased	80000.00
CY2021Q4	ibcp	Assets Pledged As Collateral AssetsPledgedAsCollateral	1900000000
CY2021Q4	ibcp	Trust Preferred Securities TrustPreferredSecurities	38400000
CY2020Q4	ibcp	Trust Preferred Securities TrustPreferredSecurities	38300000
CY2021	ibcp	Distribution Deferral Period Subordinated Debentures DistributionDeferralPeriodSubordinatedDebentures	20
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	90000
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	115000
CY2021	ibcp	Weighted Average Number Of Performance Shares Stock WeightedAverageNumberOfPerformanceSharesStock	32000
CY2020	ibcp	Weighted Average Number Of Performance Shares Stock WeightedAverageNumberOfPerformanceSharesStock	33000
CY2019	ibcp	Weighted Average Number Of Performance Shares Stock WeightedAverageNumberOfPerformanceSharesStock	42000
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	21807000
CY2020	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	22221000
CY2021Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	395000000
CY2021Q4	ibcp	Concentration Risk Loans And Lease Receivable Percentage ConcentrationRiskLoansAndLeaseReceivablePercentage	0.136
CY2021	us-gaap	Net Income Loss NetIncomeLoss	62895000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	56152000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	46435000
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	21585000
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	21977000
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	22894000
CY2021	ibcp	Stock Units For Deferred Compensation Plan For Non Employee Directors StockUnitsForDeferredCompensationPlanForNonEmployeeDirectors	121000
CY2020	ibcp	Stock Units For Deferred Compensation Plan For Non Employee Directors StockUnitsForDeferredCompensationPlanForNonEmployeeDirectors	121000
CY2019	ibcp	Stock Units For Deferred Compensation Plan For Non Employee Directors StockUnitsForDeferredCompensationPlanForNonEmployeeDirectors	132000
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	69000
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	23183000
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.91
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.56
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.03
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.88
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.53
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.00
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	12506000
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	15459000
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	10237000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11325000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1912000
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2130000
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1088000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14418000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13329000
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1900000
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2100000
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1100000
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	16236000
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	14591000
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	12130000
CY2021	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	1487000
CY2020	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	690000
CY2019	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	375000
CY2021	ibcp	Effective Income Tax Rate Reconciliation Share Based Compensation Cost Excess Benefit Deficit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationCostExcessBenefitDeficitAmount	184000
CY2020	ibcp	Effective Income Tax Rate Reconciliation Share Based Compensation Cost Excess Benefit Deficit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationCostExcessBenefitDeficitAmount	204000
CY2019	ibcp	Effective Income Tax Rate Reconciliation Share Based Compensation Cost Excess Benefit Deficit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationCostExcessBenefitDeficitAmount	204000
CY2021	ibcp	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Income Tax Effect Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsuranceIncomeTaxEffectAmount	119000
CY2020	ibcp	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Income Tax Effect Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsuranceIncomeTaxEffectAmount	196000
CY2019	ibcp	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Income Tax Effect Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsuranceIncomeTaxEffectAmount	233000
CY2021	ibcp	Income Tax Reconciliation Unrecognized Tax Benefits IncomeTaxReconciliationUnrecognizedTaxBenefits	-11000
CY2020	ibcp	Income Tax Reconciliation Unrecognized Tax Benefits IncomeTaxReconciliationUnrecognizedTaxBenefits	-206000
CY2019	ibcp	Income Tax Reconciliation Unrecognized Tax Benefits IncomeTaxReconciliationUnrecognizedTaxBenefits	-134000
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Meals And Entertainment IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment	32000
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Meals And Entertainment IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment	57000
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Meals And Entertainment IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment	86000
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-49000
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-23000
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	55000
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14418000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13329000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11325000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	9923000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	7363000
CY2021Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	1405000
CY2020Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	1047000
CY2021Q4	ibcp	Deferred Tax Assets Lease Liabilities DeferredTaxAssetsLeaseLiabilities	1386000
CY2021Q4	ibcp	Deferred Tax Assets Other Than Temporary Impairment Charge On Securities Available For Sale DeferredTaxAssetsOtherThanTemporaryImpairmentChargeOnSecuritiesAvailableForSale	144000
CY2020Q4	ibcp	Deferred Tax Assets Other Than Temporary Impairment Charge On Securities Available For Sale DeferredTaxAssetsOtherThanTemporaryImpairmentChargeOnSecuritiesAvailableForSale	144000
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	276000
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	0
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	15635000
CY2021Q4	ibcp	Deferred Tax Liabilities Purchase Premiums Net DeferredTaxLiabilitiesPurchasePremiumsNet	735000
CY2020Q4	ibcp	Deferred Tax Liabilities Purchase Premiums Net DeferredTaxLiabilitiesPurchasePremiumsNet	509000
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	0
CY2020Q4	ibcp	Deferred Tax Assets Lease Liabilities DeferredTaxAssetsLeaseLiabilities	1652000
CY2021Q4	ibcp	Deferred Tax Assets Reserve For Unfunded Lending Commitments DeferredTaxAssetsReserveForUnfundedLendingCommitments	941000
CY2020Q4	ibcp	Deferred Tax Assets Reserve For Unfunded Lending Commitments DeferredTaxAssetsReserveForUnfundedLendingCommitments	379000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	734000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	742000
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	390000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	321000
CY2021Q4	ibcp	Deferred Tax Assets Loss Reimbursement On Sold Loans Reserve DeferredTaxAssetsLossReimbursementOnSoldLoansReserve	242000
CY2020Q4	ibcp	Deferred Tax Assets Loss Reimbursement On Sold Loans Reserve DeferredTaxAssetsLossReimbursementOnSoldLoansReserve	214000
CY2021Q4	ibcp	Deferred Tax Assets Non Accrual Loan Interest Income DeferredTaxAssetsNonAccrualLoanInterestIncome	194000
CY2020Q4	ibcp	Deferred Tax Assets Non Accrual Loan Interest Income DeferredTaxAssetsNonAccrualLoanInterestIncome	203000
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	12065000
CY2021Q4	ibcp	Deferred Tax Liabilities Capitalized Mortgage Loan Servicing Rights DeferredTaxLiabilitiesCapitalizedMortgageLoanServicingRights	-5509000
CY2020Q4	ibcp	Deferred Tax Liabilities Capitalized Mortgage Loan Servicing Rights DeferredTaxLiabilitiesCapitalizedMortgageLoanServicingRights	-3550000
CY2021Q4	ibcp	Deferred Tax Liabilities Deferred Expense Deferred Loan Origination Fees Costs DeferredTaxLiabilitiesDeferredExpenseDeferredLoanOriginationFeesCosts	2011000
CY2020Q4	ibcp	Deferred Tax Liabilities Deferred Expense Deferred Loan Origination Fees Costs DeferredTaxLiabilitiesDeferredExpenseDeferredLoanOriginationFeesCosts	1901000
CY2021Q4	ibcp	Deferred Tax Liabilities Unrealized Gains On Securities Available For Sale DeferredTaxLiabilitiesUnrealizedGainsOnSecuritiesAvailableForSale	1674000
CY2020Q4	ibcp	Deferred Tax Liabilities Unrealized Gains On Securities Available For Sale DeferredTaxLiabilitiesUnrealizedGainsOnSecuritiesAvailableForSale	4206000
CY2021Q4	ibcp	Deferred Tax Liability Lease Right Of Use Asset DeferredTaxLiabilityLeaseRightOfUseAsset	1361000
CY2020Q4	ibcp	Deferred Tax Liability Lease Right Of Use Asset DeferredTaxLiabilityLeaseRightOfUseAsset	1606000
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	18000
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	11290000
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	11790000
CY2021Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	4345000
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	275000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	180000
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	438000
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	588000
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	11000
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	15000
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	20000
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	11000
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	273000
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	170000
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	180000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	180000
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	438000
CY2021Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	40000.00
CY2021	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	0
CY2020	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	0
CY2019	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	0
CY2021Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0
CY2021	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Additional Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized	700000
CY2021Q4	ibcp	Shares Issued On Deferral Basis Credited Percentage Of Current Value SharesIssuedOnDeferralBasisCreditedPercentageOfCurrentValue	0.90
CY2021Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	2100000
CY2021	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y9M18D
CY2021	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	9392000
CY2020	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	7521000
CY2019	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	9282000
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.08
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.08
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.08
CY2021	ibcp	Defined Contribution Plan Maximum Annual Contributions Employer Percent DefinedContributionPlanMaximumAnnualContributionsEmployerPercent	0.06
CY2021	ibcp	Employee Stock Ownership Plan Esop Contributions To Esop EmployeeStockOwnershipPlanESOPContributionsToESOP	0.02
CY2019	ibcp	Employee Stock Ownership Plan Esop Contributions To Esop EmployeeStockOwnershipPlanESOPContributionsToESOP	0.02
CY2020	ibcp	Employee Stock Ownership Plan Esop Contributions To Esop EmployeeStockOwnershipPlanESOPContributionsToESOP	0.02
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3300000
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3200000
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2600000
CY2021	ibcp	Incentive Based Compensation Expense IncentiveBasedCompensationExpense	15600000
CY2020	ibcp	Incentive Based Compensation Expense IncentiveBasedCompensationExpense	15700000
CY2019	ibcp	Incentive Based Compensation Expense IncentiveBasedCompensationExpense	9500000
CY2021	ibcp	Employee Compensation Benefit Health Care And Life Insurance Expense EmployeeCompensationBenefitHealthCareAndLifeInsuranceExpense	6100000
CY2020	ibcp	Employee Compensation Benefit Health Care And Life Insurance Expense EmployeeCompensationBenefitHealthCareAndLifeInsuranceExpense	4800000
CY2019	ibcp	Employee Compensation Benefit Health Care And Life Insurance Expense EmployeeCompensationBenefitHealthCareAndLifeInsuranceExpense	5700000
CY2021	ibcp	Investment And Insurance Commissions InvestmentAndInsuranceCommissions	2603000
CY2020	ibcp	Investment And Insurance Commissions InvestmentAndInsuranceCommissions	1971000
CY2019	ibcp	Investment And Insurance Commissions InvestmentAndInsuranceCommissions	1658000
CY2021	ibcp	Fees Atm Cards FeesATMCards	1133000
CY2020	ibcp	Fees Atm Cards FeesATMCards	1197000
CY2019	ibcp	Fees Atm Cards FeesATMCards	1403000
CY2021	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	567000
CY2020	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	910000
CY2019	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1111000
CY2021	ibcp	Other Miscellaneous Non Interest Income OtherMiscellaneousNonInterestIncome	5089000
CY2020	ibcp	Other Miscellaneous Non Interest Income OtherMiscellaneousNonInterestIncome	3443000
CY2019	ibcp	Other Miscellaneous Non Interest Income OtherMiscellaneousNonInterestIncome	5110000
CY2021Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	12283000
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	16782000
CY2021Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	5961000
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	11754000
CY2020Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	2416000
CY2019Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	13077000
CY2021	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	5722000
CY2020	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	417000
CY2021	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	1259000
CY2020	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	11078000
CY2021Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	6879000
CY2020Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	2416000
CY2021Q4	ibcp	Loans And Leases Receivable Loan Commitments Related Parties LoansAndLeasesReceivableLoanCommitmentsRelatedParties	1900000
CY2020Q4	ibcp	Loans And Leases Receivable Loan Commitments Related Parties LoansAndLeasesReceivableLoanCommitmentsRelatedParties	1740000
CY2021Q4	ibcp	Loans And Leases Receivable Outstanding Loan Commitments Related Parties LoansAndLeasesReceivableOutstandingLoanCommitmentsRelatedParties	20000.00
CY2020Q4	ibcp	Loans And Leases Receivable Outstanding Loan Commitments Related Parties LoansAndLeasesReceivableOutstandingLoanCommitmentsRelatedParties	40000.00
CY2021Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	3400000
CY2020Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	2000000.0
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	1672000
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	1780000
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	2217000
CY2021	us-gaap	Variable Lease Cost VariableLeaseCost	63000
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	69000
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	142000
CY2021	us-gaap	Short Term Lease Cost ShortTermLeaseCost	64000
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	36000
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	19000
CY2021	us-gaap	Lease Cost LeaseCost	1799000
CY2020	us-gaap	Lease Cost LeaseCost	1885000
CY2019	us-gaap	Lease Cost LeaseCost	2378000
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	6481000
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	7646000
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	6602000
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	7868000
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y6M
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y1M13D
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.023
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.024
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	1619000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1311000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	816000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	809000
CY2020	ibcp	Servicing Asset Unrealized Gain Loss ServicingAssetUnrealizedGainLoss	-16224000
CY2019	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	167000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	744000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	1795000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	7094000
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	492000
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	6602000
CY2021Q4	ibcp	Retained Earnings Accumulated Deficit Subsidiary RetainedEarningsAccumulatedDeficitSubsidiary	100100000
CY2021Q4	us-gaap	Banking Regulation Capital Conservation Buffer Capital Conserved Minimum BankingRegulationCapitalConservationBufferCapitalConservedMinimum	0.0250
CY2020Q4	us-gaap	Banking Regulation Capital Conservation Buffer Capital Conserved Minimum BankingRegulationCapitalConservationBufferCapitalConservedMinimum	0.0250
CY2021	ibcp	Current Expected Credit Loss Transition Method For Regulatory Purpose CurrentExpectedCreditLossTransitionMethodForRegulatoryPurpose	P3Y
CY2021	ibcp	Loans Held For Sale Unrealized Gain Loss LoansHeldForSaleUnrealizedGainLoss	-2805000
CY2021	ibcp	Servicing Asset Unrealized Gain Loss ServicingAssetUnrealizedGainLoss	-2108000
CY2020	ibcp	Loans Held For Sale Unrealized Gain Loss LoansHeldForSaleUnrealizedGainLoss	1962000
CY2019	ibcp	Loans Held For Sale Unrealized Gain Loss LoansHeldForSaleUnrealizedGainLoss	637000
CY2019	ibcp	Servicing Asset Unrealized Gain Loss ServicingAssetUnrealizedGainLoss	-9532000
CY2021Q4	ibcp	Collateral Dependent Loans Carrying Amount CollateralDependentLoansCarryingAmount	1400000
CY2021Q4	ibcp	Collateral Dependent Loans Valuation Allowance CollateralDependentLoansValuationAllowance	600000
CY2020Q4	ibcp	Collateral Dependent Loans Carrying Amount CollateralDependentLoansCarryingAmount	9100000
CY2020Q4	ibcp	Collateral Dependent Loans Valuation Allowance CollateralDependentLoansValuationAllowance	1800000
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	300000
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	700000
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1300000
CY2021Q4	ibcp	Other Real Estate Impaired Net Reserves OtherRealEstateImpairedNetReserves	0
CY2021Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	30000.00
CY2020Q4	ibcp	Other Real Estate Impaired Net Reserves OtherRealEstateImpairedNetReserves	100000
CY2020Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	90000.00
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	30000.00
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	30000.00
CY2021Q4	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	55470000
CY2021Q4	us-gaap	Fair Value Option Aggregate Differences Loans And Long Term Receivables FairValueOptionAggregateDifferencesLoansAndLongTermReceivables	1051000
CY2021Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	54419000
CY2020Q4	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	92434000
CY2020Q4	us-gaap	Fair Value Option Aggregate Differences Loans And Long Term Receivables FairValueOptionAggregateDifferencesLoansAndLongTermReceivables	3856000
CY2020Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	88578000
CY2019Q4	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	69800000
CY2019Q4	us-gaap	Fair Value Option Aggregate Differences Loans And Long Term Receivables FairValueOptionAggregateDifferencesLoansAndLongTermReceivables	1894000
CY2019Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	67906000
CY2021Q4	ibcp	Reciprocal Deposits Included In Deposits With No Stated Maturity ReciprocalDepositsIncludedInDepositsWithNoStatedMaturity	562210000
CY2020Q4	ibcp	Reciprocal Deposits Included In Deposits With No Stated Maturity ReciprocalDepositsIncludedInDepositsWithNoStatedMaturity	518400000
CY2021Q4	ibcp	Reciprocal Deposits Included In Deposits With Stated Maturity ReciprocalDepositsIncludedInDepositsWithStatedMaturity	24416000
CY2020Q4	ibcp	Reciprocal Deposits Included In Deposits With Stated Maturity ReciprocalDepositsIncludedInDepositsWithStatedMaturity	37785000
CY2021	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-8408000
CY2021	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	1115000
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-9523000
CY2020	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	12015000
CY2020	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-1795000
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	13810000
CY2019	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	6769000
CY2019	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	447000
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	6322000
CY2021Q4	ibcp	Percentage Of Revenue Excluded From Asu201409 PercentageOfRevenueExcludedFromASU201409	0.846
CY2020Q4	ibcp	Percentage Of Revenue Excluded From Asu201409 PercentageOfRevenueExcludedFromASU201409	0.881
CY2019Q4	ibcp	Percentage Of Revenue Excluded From Asu201409 PercentageOfRevenueExcludedFromASU201409	0.849
CY2021Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	0
CY2021Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	0
CY2021	ibcp	Number Of Real Estate Assets Sold NumberOfRealEstateAssetsSold	0
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	29098000
CY2021	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	567000
CY2021	ibcp	Noninterest Income Other Operating Income Other NoninterestIncomeOtherOperatingIncomeOther	3942000
CY2021	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	9392000
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	24026000
CY2020	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	910000
CY2020	ibcp	Noninterest Income Other Operating Income Other NoninterestIncomeOtherOperatingIncomeOther	2332000
CY2020	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	7521000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	25953000
CY2019	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1111000
CY2019	ibcp	Noninterest Income Other Operating Income Other NoninterestIncomeOtherOperatingIncomeOther	3723000
CY2019	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	9282000

Files In Submission

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0001140361-22-007951-index.html	Edgar Link	pending
0001140361-22-007951.txt	Edgar Link	pending
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$IBCP
INDEPENDENT BANK CORP /MI/ Stock $ibcp

2021 Form 10-K Financial Statement

#000114036122007951 Filed on March 04, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$IBCP INDEPENDENT BANK CORP /MI/ Stock $ibcp

2021 Form 10-K Financial Statement

#000114036122007951 Filed on March 04, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$IBCP
INDEPENDENT BANK CORP /MI/ Stock $ibcp