$INDB
INDEPENDENT BANK CORP Stock $indb

$indb Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000077690119000069 Filed on February 28, 2019

Income Statement

Concept	2017 Q4	2017 Q3	2017 Q2
Revenue	$72.88M	$71.78M	$68.13M
YoY Change	14.9%	15.2%	11.4%
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	$4.200M	$4.000M	$3.900M
YoY Change	13.51%	14.29%	-9.3%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$5.044M	$4.705M	$4.378M
YoY Change	7.87%	1.4%	-5.38%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$37.00M	$36.53M	$31.29M
YoY Change	48.59%	20.66%	4.73%
Income Tax	$14.92M	$12.68M	$10.73M
% Of Pretax Income	40.31%	34.71%	34.29%
Net Earnings	$22.06M	$23.85M	$20.56M
YoY Change	28.44%	16.44%	0.93%
Net Earnings / Revenue	30.28%	33.23%	30.18%
Basic Earnings Per Share	$0.80	$0.87	$0.75
Diluted Earnings Per Share	$0.80	$0.87	$0.75
COMMON SHARES
Basic Shares Outstanding	27.45M shares	27.44M shares	27.26M shares
Diluted Shares Outstanding	27.52M shares	27.51M shares	27.33M shares

Balance Sheet

Concept	2017 Q4	2017 Q3	2017 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents
Short-Term Investments	$946.5M	$909.2M	$915.6M
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$94.72M	$94.91M	$92.66M
YoY Change	20.7%	24.18%	21.65%
Goodwill	$256.1M	$231.8M	$231.8M
YoY Change	15.61%	15.28%	15.28%
Intangibles	$9.341M
YoY Change	-5.15%
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$8.082B	$8.053B	$8.017B
YoY Change	4.83%	7.34%	8.07%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$163.0M	$180.0M	$159.0M
YoY Change	-7.91%	27.66%	13.57%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$163.0M	$180.0M	$159.0M
YoY Change	-7.91%	27.66%	13.57%
LONG-TERM LIABILITIES
Long-Term Debt	$107.8M	$108.0M	$108.0M
YoY Change	0.01%	0.0%	0.0%
Other Long-Term Liabilities	$85.00M	$98.00M	$87.00M
YoY Change	-12.37%	-14.78%	-26.89%
Total Long-Term Liabilities	$107.8M	$206.0M	$195.0M
YoY Change	0.01%	-7.62%	-14.1%
TOTAL LIABILITIES
Total Short-Term Liabilities	$163.0M	$180.0M	$159.0M
Total Long-Term Liabilities	$107.8M	$206.0M	$195.0M
Total Liabilities	$7.138B	$7.122B	$7.103B
YoY Change	4.29%	6.55%	7.37%
SHAREHOLDERS EQUITY
Retained Earnings	$465.9M	$452.7M	$437.6M
YoY Change	12.52%	11.84%	11.66%
Common Stock	$273.0K	$273.0K	$272.0K
YoY Change	1.87%	4.6%	4.21%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$943.8M	$931.2M	$914.6M
YoY Change
Total Liabilities & Shareholders Equity	$8.082B	$8.053B	$8.017B
YoY Change	4.83%	7.34%	8.07%

Cashflow Statement

Concept	2017 Q4	2017 Q3	2017 Q2
OPERATING ACTIVITIES
Net Income	$22.06M	$23.85M	$20.56M
YoY Change	28.44%	16.44%	0.93%
Depreciation, Depletion And Amortization	$4.200M	$4.000M	$3.900M
YoY Change	13.51%	14.29%	-9.3%
Cash From Operating Activities	$42.50M	$39.20M	$11.80M
YoY Change	-19.96%	51.94%	-5.6%
INVESTING ACTIVITIES
Capital Expenditures	-$6.500M	-$4.400M	-$8.700M
YoY Change	47.73%	120.0%	625.0%
Acquisitions
YoY Change
Other Investing Activities	-$103.3M	-$11.50M	-$57.20M
YoY Change	64.23%	-82.03%	-25.23%
Cash From Investing Activities	-$109.8M	-$15.90M	-$65.90M
YoY Change	63.39%	-75.95%	-15.3%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	21.20M	-400.0K	70.40M
YoY Change	-138.83%	-100.61%	-64.91%
NET CHANGE
Cash From Operating Activities	42.50M	39.20M	11.80M
Cash From Investing Activities	-109.8M	-15.90M	-65.90M
Cash From Financing Activities	21.20M	-400.0K	70.40M
Net Change In Cash	-46.10M	22.90M	16.30M
YoY Change	-32.9%	-10.89%	-87.95%
FREE CASH FLOW
Cash From Operating Activities	$42.50M	$39.20M	$11.80M
Capital Expenditures	-$6.500M	-$4.400M	-$8.700M
Free Cash Flow	$49.00M	$43.60M	$20.50M
YoY Change	-14.78%	56.83%	49.64%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2018	dei	Amendment Flag AmendmentFlag	false
CY2018	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
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CY2018	dei	Entity Shell Company EntityShellCompany	false
CY2018	dei	Document Period End Date DocumentPeriodEndDate	2018-12-31
CY2018	dei	Entity Registrant Name EntityRegistrantName	Independent Bank Corp
CY2018	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2016	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	227844000	USD
CY2018	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	4775000	USD
CY2017	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	2950000	USD
CY2016	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	6075000	USD
CY2018	indb	Service Charges On Deposit Accounts ServiceChargesOnDepositAccounts	18327000	USD
CY2017	indb	Service Charges On Deposit Accounts ServiceChargesOnDepositAccounts	17822000	USD
CY2016	indb	Service Charges On Deposit Accounts ServiceChargesOnDepositAccounts	18652000	USD
CY2018	indb	Interchange And Atm Fees InterchangeAndAtmFees	18916000	USD
CY2017	indb	Interchange And Atm Fees InterchangeAndAtmFees	17291000	USD
CY2016	indb	Interchange And Atm Fees InterchangeAndAtmFees	16210000	USD
CY2018	us-gaap	Investment Banking Advisory Brokerage And Underwriting Fees And Commissions InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions	26155000	USD
CY2017	us-gaap	Investment Banking Advisory Brokerage And Underwriting Fees And Commissions InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions	23802000	USD
CY2016	us-gaap	Investment Banking Advisory Brokerage And Underwriting Fees And Commissions InvestmentBankingAdvisoryBrokerageAndUnderwritingFeesAndCommissions	21809000	USD
CY2018	indb	Fees And Commission Mortgage Banking FeesAndCommissionMortgageBanking	4071000	USD
CY2017	indb	Fees And Commission Mortgage Banking FeesAndCommissionMortgageBanking	4960000	USD
CY2016	indb	Fees And Commission Mortgage Banking FeesAndCommissionMortgageBanking	6607000	USD
CY2018	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	4060000	USD
CY2017	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	4127000	USD
CY2016	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	4089000	USD
CY2018	indb	Gain Realized On Life Insurance Policies GainRealizedOnLifeInsurancePolicies	1463000	USD
CY2017	indb	Gain Realized On Life Insurance Policies GainRealizedOnLifeInsurancePolicies	0	USD
CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	2373000	USD
CY2017	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	3836000	USD
CY2016	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	6155000	USD
CY2018	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	13140000	USD
CY2017	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	11156000	USD
CY2016	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	8906000	USD
CY2018	us-gaap	Noninterest Income NoninterestIncome	88505000	USD
CY2017	us-gaap	Noninterest Income NoninterestIncome	82994000	USD
CY2016	us-gaap	Noninterest Income NoninterestIncome	82428000	USD
CY2018	us-gaap	Labor And Related Expense LaborAndRelatedExpense	124328000	USD
CY2017	us-gaap	Labor And Related Expense LaborAndRelatedExpense	116600000	USD
CY2016	us-gaap	Labor And Related Expense LaborAndRelatedExpense	108636000	USD
CY2018	us-gaap	Occupancy Net OccupancyNet	27098000	USD
CY2017	us-gaap	Occupancy Net OccupancyNet	24693000	USD
CY2016	us-gaap	Occupancy Net OccupancyNet	22867000	USD
CY2018	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	5125000	USD
CY2017	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	4988000	USD
CY2016	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	4975000	USD
CY2018	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	2774000	USD
CY2017	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3068000	USD
CY2016	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	3380000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	4942000	USD
CY2017	us-gaap	Advertising Expense AdvertisingExpense	4989000	USD
CY2016	us-gaap	Advertising Expense AdvertisingExpense	5202000	USD
CY2018	us-gaap	Professional Fees ProfessionalFees	3891000	USD
CY2017	us-gaap	Professional Fees ProfessionalFees	4038000	USD
CY2016	us-gaap	Professional Fees ProfessionalFees	3486000	USD
CY2018	indb	Debit Card Expense DebitCardExpense	3429000	USD
CY2017	indb	Debit Card Expense DebitCardExpense	3430000	USD
CY2016	indb	Debit Card Expense DebitCardExpense	2993000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2016	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-437000	USD
CY2018	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	11168000	USD
CY2017	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	3393000	USD
CY2016	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	5455000	USD
CY2018	indb	Software Maintenance SoftwareMaintenance	4202000	USD
CY2017	indb	Software Maintenance SoftwareMaintenance	3636000	USD
CY2016	indb	Software Maintenance SoftwareMaintenance	3061000	USD
CY2018	us-gaap	Other Noninterest Expense OtherNoninterestExpense	39012000	USD
CY2017	us-gaap	Other Noninterest Expense OtherNoninterestExpense	35524000	USD
CY2016	us-gaap	Other Noninterest Expense OtherNoninterestExpense	31630000	USD
CY2018	us-gaap	Noninterest Expense NoninterestExpense	225969000	USD
CY2017	us-gaap	Noninterest Expense NoninterestExpense	204359000	USD
CY2016	us-gaap	Noninterest Expense NoninterestExpense	192122000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	155926000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	134545000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	112075000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34304000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	47341000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35427000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	121622000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	87204000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	76648000	USD
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.41
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.19
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.90
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.40
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.19
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.90
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27592380	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27294028	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	26404071	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	61428	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	78076	shares
CY2016	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	51847	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	27653808	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	27372104	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26455918	shares
CY2018	us-gaap	Net Income Loss NetIncomeLoss	121622000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	87204000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	76648000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-4501000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-677000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-1133000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	4829000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	443000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	2170000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1558000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	260000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-78000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1886000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-494000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1115000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	123508000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	86710000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	77763000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	771463000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	76648000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1115000	USD
CY2016	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	30722000	USD
CY2016	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	40730000	USD
CY2016	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	201000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	476000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2965000	USD
CY2016	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-696000	USD
CY2016	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	2323000	USD
CY2016	indb	Tax Benefit Related To Deferred Compensation Distributions TaxBenefitRelatedToDeferredCompensationDistributions	187000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	864690000	USD
CY2017Q4	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Equity Or Net Assets1 NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1	177000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	87204000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-494000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	34997000	USD
CY2017	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	23468000	USD
CY2017	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	214000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3333000	USD
CY2017	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-1422000	USD
CY2017	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	1636000	USD
CY2017	us-gaap	Increase Decrease In Deferred Compensation IncreaseDecreaseInDeferredCompensation	0	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	943809000	USD
CY2018Q4	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Equity Or Net Assets1 NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1	0	USD
CY2018	us-gaap	Prior Period Reclassification Adjustment PriorPeriodReclassificationAdjustment	0	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	121622000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1886000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	42051000	USD
CY2018	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	42474000	USD
CY2018	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	184000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4225000	USD
CY2018	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-1371000	USD
CY2018	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	2712000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1073490000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	121622000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	87204000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	76648000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	15994000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	15681000	USD
CY2016	us-gaap	Depreciation And Amortization DepreciationAndAmortization	14354000	USD
CY2018	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	4775000	USD
CY2017	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	2950000	USD
CY2016	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	6075000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-4497000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	9211000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5000	USD
CY2018	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	0	USD
CY2017	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	466000	USD
CY2016	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	0	USD
CY2018	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-1225000	USD
CY2017	us-gaap	Gain Loss On Investments GainLossOnInvestments	3000	USD
CY2016	us-gaap	Gain Loss On Investments GainLossOnInvestments	-26000	USD
CY2018	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	1126000	USD
CY2017	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	108000	USD
CY2016	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-114000	USD
CY2018	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-112000	USD
CY2017	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-288000	USD
CY2016	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-29000	USD
CY2018	us-gaap	Sale Leaseback Transaction Current Period Gain Recognized SaleLeasebackTransactionCurrentPeriodGainRecognized	730000	USD
CY2017	us-gaap	Sale Leaseback Transaction Current Period Gain Recognized SaleLeasebackTransactionCurrentPeriodGainRecognized	1034000	USD
CY2016	us-gaap	Sale Leaseback Transaction Current Period Gain Recognized SaleLeasebackTransactionCurrentPeriodGainRecognized	1034000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	4225000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	3333000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	2965000	USD
CY2018	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	0	USD
CY2017	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	0	USD
CY2016	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	476000	USD
CY2018	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	4060000	USD
CY2017	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	4127000	USD
CY2016	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	4089000	USD
CY2018	indb	Gain Realized On Life Insurance Policies GainRealizedOnLifeInsurancePolicies	1463000	USD
CY2018	indb	Change In Fair Value On Loans Held For Sale ChangeInFairValueOnLoansHeldForSale	-51000	USD
CY2017	indb	Change In Fair Value On Loans Held For Sale ChangeInFairValueOnLoansHeldForSale	-113000	USD
CY2016	indb	Change In Fair Value On Loans Held For Sale ChangeInFairValueOnLoansHeldForSale	87000	USD
CY2018	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	180000	USD
CY2017	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	520000	USD
CY2016	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	448000	USD
CY2018	us-gaap	Increase Decrease In Loans Held For Sale IncreaseDecreaseInLoansHeldForSale	1714000	USD
CY2017	us-gaap	Increase Decrease In Loans Held For Sale IncreaseDecreaseInLoansHeldForSale	-1258000	USD
CY2016	us-gaap	Increase Decrease In Loans Held For Sale IncreaseDecreaseInLoansHeldForSale	62000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-503000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-20022000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-7627000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	7100000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-3825000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-8738000	USD
CY2018	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	20215000	USD
CY2017	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	43705000	USD
CY2016	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	16251000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	141837000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	130909000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	92899000	USD
CY2018	us-gaap	Proceeds From Sale Of Trading Securities Heldforinvestment ProceedsFromSaleOfTradingSecuritiesHeldforinvestment	5752000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	0	USD
CY2016	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	0	USD
CY2018	us-gaap	Increase Decrease In Equity Securities Fv Ni IncreaseDecreaseInEquitySecuritiesFvNi	6315000	USD
CY2017	us-gaap	Increase Decrease In Equity Securities Fv Ni IncreaseDecreaseInEquitySecuritiesFvNi	0	USD
CY2016	us-gaap	Increase Decrease In Equity Securities Fv Ni IncreaseDecreaseInEquitySecuritiesFvNi	0	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1027000	USD
CY2016	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	618000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	82418000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	54191000	USD
CY2016	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	69775000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	78990000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	140885000	USD
CY2016	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	69671000	USD
CY2018	us-gaap	Proceeds From Maturities Repayments And Calls Of Trading Securities Heldforinvestment ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment	82355000	USD
CY2017	us-gaap	Proceeds From Maturities Repayments And Calls Of Trading Securities Heldforinvestment ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment	78757000	USD
CY2016	us-gaap	Proceeds From Maturities Repayments And Calls Of Trading Securities Heldforinvestment ProceedsFromMaturitiesRepaymentsAndCallsOfTradingSecuritiesHeldforinvestment	90991000	USD
CY2018	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	195538000	USD
CY2017	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	89033000	USD
CY2016	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	100198000	USD
CY2018	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	2376000	USD
CY2017	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-386000	USD
CY2016	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-5229000	USD
CY2018	indb	Investmentin Low Income Housing Projects InvestmentinLowIncomeHousingProjects	-3434000	USD
CY2017	indb	Investmentin Low Income Housing Projects InvestmentinLowIncomeHousingProjects	-7645000	USD
CY2016	indb	Investmentin Low Income Housing Projects InvestmentinLowIncomeHousingProjects	-7626000	USD
CY2018	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	164000	USD
CY2017	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	164000	USD
CY2016	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	163000	USD
CY2018	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	2850000	USD
CY2017	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	USD
CY2016	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	USD
CY2018	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	258633000	USD
CY2017	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	204702000	USD
CY2016	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	227838000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	6906000	USD
CY2017	us-gaap	Cash Acquired In Excess Of Payments To Acquire Business CashAcquiredInExcessOfPaymentsToAcquireBusiness	6289000	USD
CY2016	us-gaap	Cash Acquired In Excess Of Payments To Acquire Business CashAcquiredInExcessOfPaymentsToAcquireBusiness	8668000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	11106000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	25080000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	10395000	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	2189000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	6306000	USD
CY2016	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	345000	USD
CY2018	us-gaap	Proceeds From Sale Of Wholly Owned Real Estate And Real Estate Acquired In Settlement Of Loans ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans	387000	USD
CY2017	us-gaap	Proceeds From Sale Of Wholly Owned Real Estate And Real Estate Acquired In Settlement Of Loans ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans	3784000	USD
CY2016	us-gaap	Proceeds From Sale Of Wholly Owned Real Estate And Real Estate Acquired In Settlement Of Loans ProceedsFromSaleOfWhollyOwnedRealEstateAndRealEstateAcquiredInSettlementOfLoans	1583000	USD
CY2018	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	0	USD
CY2017	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	0	USD
CY2016	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	204000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-387511000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-316769000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-238886000	USD
CY2018	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-1430000	USD
CY2017	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-19509000	USD
CY2016	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-104803000	USD
CY2018	us-gaap	Increase Decrease In Other Deposits IncreaseDecreaseInOtherDeposits	280017000	USD
CY2017	us-gaap	Increase Decrease In Other Deposits IncreaseDecreaseInOtherDeposits	177241000	USD
CY2016	us-gaap	Increase Decrease In Other Deposits IncreaseDecreaseInOtherDeposits	350739000	USD
CY2018	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	67046000	USD
CY2016	us-gaap	Increase Decrease In Federal Funds Purchased And Securities Sold Under Agreements To Repurchase Net IncreaseDecreaseInFederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchaseNet	-37000000	USD
CY2018	indb	Increase Decrease In Federal Home Loan Bank Advances Long Term IncreaseDecreaseInFederalHomeLoanBankAdvancesLongTerm	-2475000	USD
CY2017	indb	Increase Decrease In Federal Home Loan Bank Advances Long Term IncreaseDecreaseInFederalHomeLoanBankAdvancesLongTerm	0	USD
CY2016	indb	Increase Decrease In Federal Home Loan Bank Advances Long Term IncreaseDecreaseInFederalHomeLoanBankAdvancesLongTerm	-65791000	USD
CY2018	indb	Increase Decreasein Customer Repurchase Agreements IncreaseDecreaseinCustomerRepurchaseAgreements	-21503000	USD
CY2017	indb	Increase Decreasein Customer Repurchase Agreements IncreaseDecreaseinCustomerRepurchaseAgreements	-14234000	USD
CY2016	indb	Increase Decreasein Customer Repurchase Agreements IncreaseDecreaseinCustomerRepurchaseAgreements	42955000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2016	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-437000	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	184000	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	214000	USD
CY2016	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	201000	USD
CY2018	us-gaap	Proceeds From Repurchase Of Equity ProceedsFromRepurchaseOfEquity	-1371000	USD
CY2017	us-gaap	Proceeds From Repurchase Of Equity ProceedsFromRepurchaseOfEquity	-1422000	USD
CY2016	us-gaap	Proceeds From Repurchase Of Equity ProceedsFromRepurchaseOfEquity	-696000	USD
CY2016	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	476000	USD
CY2016	indb	Tax Benefit From Deferred Compensation Distribution TaxBenefitFromDeferredCompensationDistribution	187000	USD
CY2018	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	2712000	USD
CY2017	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	1636000	USD
CY2016	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	2323000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	40167000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	34045000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	29711000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	283013000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	109881000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	159317000	USD
CY2018	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	37339000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-75979000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	13330000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	213116000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	289095000	USD
CY2015Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	275765000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	250455000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	213116000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents And Federal Funds Sold CashCashEquivalentsAndFederalFundsSold	289095000	USD
CY2018	us-gaap	Interest Paid InterestPaid	25337000	USD
CY2017	us-gaap	Interest Paid InterestPaid	18626000	USD
CY2016	us-gaap	Interest Paid InterestPaid	18963000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	27809000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	32865000	USD
CY2016	us-gaap	Income Taxes Paid IncomeTaxesPaid	33473000	USD
CY2017	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	511000	USD
CY2016	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	1322000	USD
CY2018	indb	Capitalcommitmentrelatingto Low Income Housing Projectinvestmentsnoncash CapitalcommitmentrelatingtoLowIncomeHousingProjectinvestmentsnoncash	2833000	USD
CY2017	indb	Capitalcommitmentrelatingto Low Income Housing Projectinvestmentsnoncash CapitalcommitmentrelatingtoLowIncomeHousingProjectinvestmentsnoncash	20000	USD
CY2016	indb	Capitalcommitmentrelatingto Low Income Housing Projectinvestmentsnoncash CapitalcommitmentrelatingtoLowIncomeHousingProjectinvestmentsnoncash	5180000	USD
CY2018	indb	Transferofcustomerrepurchaseagreementstodepositsnoncash Transferofcustomerrepurchaseagreementstodepositsnoncash	141176000	USD
CY2017	indb	Transferofcustomerrepurchaseagreementstodepositsnoncash Transferofcustomerrepurchaseagreementstodepositsnoncash	0	USD
CY2016	indb	Transferofcustomerrepurchaseagreementstodepositsnoncash Transferofcustomerrepurchaseagreementstodepositsnoncash	0	USD
CY2018	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	42474000	USD
CY2017	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	23468000	USD
CY2016	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	40730000	USD
CY2018Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets	362286000	USD
CY2017Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets	179252000	USD
CY2016Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets	266242000	USD
CY2018Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities	312906000	USD
CY2017Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities	162073000	USD
CY2016Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities	234180000	USD
CY2018	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	ReclassificationCertain previously reported amounts have been reclassified to conform to the current year’s presentation.
CY2018	us-gaap	Use Of Estimates UseOfEstimates	Use of EstimatesThe preparation of financial statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could vary from these estimates. Material estimates that are particularly susceptible to significant changes in the near-term relate to the determination of the allowance for loan losses, income taxes, valuation and potential impairment of investment securities, other-than-temporary impairment (“OTTI”) of certain investment securities, as well as valuation of goodwill and other intangibles and their respective analyses of impairment.
CY2018	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	Significant Concentrations of Credit Risk<div style="line-height:120%;padding-top:6px;text-align:justify;text-indent:48px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The vast majority of the Bank’s lending activities are conducted in the Commonwealth of Massachusetts and Rhode Island. The Bank originates commercial and industrial loans, commercial and residential real estate loans, including construction loans, small business loans, home equity loans, and other consumer loans for its portfolio. The Bank considers a concentration of credit to a particular industry to exist when the aggregate credit exposure which includes direct, indirect or contingent obligations to a borrower, an affiliated group of borrowers or a nonaffiliated group of borrowers engaged in one industry, exceeds 10% of the Bank’s loan portfolio.</span></div><span style="font-family:inherit;font-size:10pt;">Loans originated by the Bank to lessors of nonresidential buildings represented </span><span style="font-family:inherit;font-size:10pt;"><span>15.1%</span></span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;"><span>15.4%</span></span><span style="font-family:inherit;font-size:10pt;"> of the total loan portfolio at </span><span style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">December 31, 2018</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;color:#000000;text-decoration:none;">2017</span>, respectively. Within this concentration category, the Company believes it is well diversified among collateral property types and tenant industries.
CY2018Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	1300000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	972000	USD
CY2018Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	1500000	USD
CY2017Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	1300000	USD
CY2018Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	19500000	USD
CY2018	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-1225000	USD
CY2018	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	874000	USD
CY2018	us-gaap	Equity Securities Fv Ni Unrealized Gain Loss EquitySecuritiesFvNiUnrealizedGainLoss	-2099000	USD
CY2018Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	450548000	USD
CY2018Q4	us-gaap	Available For Sale Equity Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1233000	USD
CY2018Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	9029000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	442752000	USD
CY2017Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	448219000	USD
CY2017Q4	us-gaap	Available For Sale Equity Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax	3740000	USD
CY2017Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	4461000	USD
CY2017Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	447498000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	611490000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	2533000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	10383000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	603640000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	497688000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	2429000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	5923000	USD
CY2017Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	494194000	USD
CY2018Q4	indb	Available For Sale Securities And Held To Maturity Securities Amortized Cost AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesAmortizedCost	1062038000	USD
CY2018Q4	indb	Available For Sale Securities And Held To Maturity Securities Gross Unrealized Gains AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesGrossUnrealizedGains	3766000	USD
CY2018Q4	indb	Available For Sale Securities And Held To Maturity Securities Gross Unrealized Losses AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesGrossUnrealizedLosses	19412000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale And Held To Maturity DebtSecuritiesAvailableForSaleAndHeldToMaturity	1046392000	USD
CY2017Q4	indb	Available For Sale Securities And Held To Maturity Securities Amortized Cost AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesAmortizedCost	945907000	USD
CY2017Q4	indb	Available For Sale Securities And Held To Maturity Securities Gross Unrealized Gains AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesGrossUnrealizedGains	6169000	USD
CY2017Q4	indb	Available For Sale Securities And Held To Maturity Securities Gross Unrealized Losses AvailableForSaleSecuritiesAndHeldToMaturitySecuritiesGrossUnrealizedLosses	10384000	USD
CY2017Q4	us-gaap	Debt Securities Available For Sale And Held To Maturity DebtSecuritiesAvailableForSaleAndHeldToMaturity	941692000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	450548000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	611490000	USD
CY2018Q4	indb	Callable Securities In Investment Portfolio CallableSecuritiesInInvestmentPortfolio	5300000	USD
CY2018Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Securities Pledged PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged	361100000	USD
CY2017Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Securities Pledged PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged	547200000	USD
CY2017Q4	indb	Investmentsinobligationsofindividualstatescountiesormunicipalitieswhichexceed10ofequity Investmentsinobligationsofindividualstatescountiesormunicipalitieswhichexceed10ofequity	0	USD
CY2018Q4	indb	Available For Sale And Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions AvailableForSaleAndHeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	205	holding
CY2018Q4	indb	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	202901000	USD
CY2018Q4	indb	Unrealizedlosspositionforavailableforsaleandheldtomaturitysecuritiesinacontinuouslosspositionforlessthan12months Unrealizedlosspositionforavailableforsaleandheldtomaturitysecuritiesinacontinuouslosspositionforlessthan12months	2486000	USD
CY2018Q4	indb	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	566107000	USD
CY2018Q4	indb	Unrealizedlosspositionforavailableforsaleandheldtomaturitysecuritiesinacontinuouslosspositionformorethan12months Unrealizedlosspositionforavailableforsaleandheldtomaturitysecuritiesinacontinuouslosspositionformorethan12months	16926000	USD
CY2018Q4	indb	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	769008000	USD
CY2018Q4	indb	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Aggregate Loss AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss	19412000	USD
CY2017Q4	indb	Available For Sale And Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions AvailableForSaleAndHeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	163	holding
CY2017Q4	indb	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	475739000	USD
CY2017Q4	indb	Unrealizedlosspositionforavailableforsaleandheldtomaturitysecuritiesinacontinuouslosspositionforlessthan12months Unrealizedlosspositionforavailableforsaleandheldtomaturitysecuritiesinacontinuouslosspositionforlessthan12months	3465000	USD
CY2017Q4	indb	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	193298000	USD
CY2017Q4	indb	Unrealizedlosspositionforavailableforsaleandheldtomaturitysecuritiesinacontinuouslosspositionformorethan12months Unrealizedlosspositionforavailableforsaleandheldtomaturitysecuritiesinacontinuouslosspositionformorethan12months	6919000	USD
CY2017Q4	indb	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	669037000	USD
CY2017Q4	indb	Available For Sale And Held To Maturity Securities Continuous Unrealized Loss Position Aggregate Loss AvailableForSaleAndHeldToMaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss	10384000	USD
CY2018	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Period Increase Decrease OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsPeriodIncreaseDecrease	0	USD
CY2018Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	0	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	60643000	USD
CY2018	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	2597000	USD
CY2018	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	1472000	USD
CY2018	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	4775000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	64293000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	63214000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	1079000	USD
CY2018Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	6838339000	USD
CY2018Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	59060000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	6906194000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	61566000	USD
CY2017	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	6209000	USD
CY2017	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	2336000	USD
CY2017	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	2950000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	60643000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	59301000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	1342000	USD
CY2017Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	6269729000	USD
CY2017Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	72801000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	6355553000	USD
CY2015Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	55825000	USD
CY2016	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	3472000	USD
CY2016	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	3138000	USD
CY2016	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	6075000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	61566000	USD
CY2016Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	56352000	USD
CY2016Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	5214000	USD
CY2016Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	5903916000	USD
CY2016Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	77297000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	5999605000	USD
CY2018Q4	indb	Unamortized Loan Commitmentand Originationfees UnamortizedLoanCommitmentandOriginationfees	7100000	USD
CY2017Q4	indb	Unamortized Loan Commitmentand Originationfees UnamortizedLoanCommitmentandOriginationfees	6100000	USD
CY2016Q4	indb	Unamortized Loan Commitmentand Originationfees UnamortizedLoanCommitmentandOriginationfees	5100000	USD
CY2018Q4	indb	Unamortized Discountsor Premiums UnamortizedDiscountsorPremiums	15200000	USD
CY2017Q4	indb	Unamortized Discountsor Premiums UnamortizedDiscountsorPremiums	9400000	USD
CY2016Q4	indb	Unamortized Discountsor Premiums UnamortizedDiscountsorPremiums	8600000	USD
CY2018	indb	Significant Advanced Considered For Risk Rating Change SignificantAdvancedConsideredForRiskRatingChange	50000	USD
CY2018Q4	us-gaap	Notes Receivable Net NotesReceivableNet	4874718000	USD
CY2017Q4	us-gaap	Notes Receivable Net NotesReceivableNet	4539256000	USD
CY2017Q4	indb	Number Of Financing Receivables Sixty To Eighty Nine Days Past Due NumberOfFinancingReceivablesSixtyToEightyNineDaysPastDue	48	loan
CY2017Q4	indb	Number Of Financing Receivables Equal To Greater Than Ninety Days NumberOfFinancingReceivablesEqualToGreaterThanNinetyDays	92	loan
CY2017Q4	indb	Number Of Financing Receivables Total Past Due NumberOfFinancingReceivablesTotalPastDue	459	loan
CY2017Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	48746000	USD
CY2018	indb	Days To Be Termed As Non Accrual Loans DaysToBeTermedAsNonAccrualLoans	P90D
CY2018	indb	Days To Be Termed As Non Accrual Loans DaysToBeTermedAsNonAccrualLoans	P90D
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	45413000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	49630000	USD
CY2018Q4	indb	Foreclosedresidentialrealestatepropertyheldbythecreditor Foreclosedresidentialrealestatepropertyheldbythecreditor	0	USD
CY2017Q4	indb	Foreclosedresidentialrealestatepropertyheldbythecreditor Foreclosedresidentialrealestatepropertyheldbythecreditor	612000	USD
CY2018Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	3174000	USD
CY2017Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	2971000	USD
CY2018Q4	indb	Number Of Financing Receivables Thirty To Fifty Nine Days Past Due NumberOfFinancingReceivablesThirtyToFiftyNineDaysPastDue	400	loan
CY2018Q4	indb	Number Of Financing Receivables Sixty To Eighty Nine Days Past Due NumberOfFinancingReceivablesSixtyToEightyNineDaysPastDue	56	loan
CY2018Q4	indb	Number Of Financing Receivables Equal To Greater Than Ninety Days NumberOfFinancingReceivablesEqualToGreaterThanNinetyDays	110	loan
CY2018Q4	indb	Number Of Financing Receivables Total Past Due NumberOfFinancingReceivablesTotalPastDue	566	loan
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	46348000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	6859846000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	6906194000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	5000	USD
CY2017Q4	indb	Number Of Financing Receivables Thirty To Fifty Nine Days Past Due NumberOfFinancingReceivablesThirtyToFiftyNineDaysPastDue	319	loan
CY2017Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	6355553000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	6306807000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	8000	USD
CY2018Q4	indb	Tdrs Recorded Investment On Accrual Status TdrsRecordedInvestmentOnAccrualStatus	23849000	USD
CY2017Q4	indb	Tdrs Recorded Investment On Accrual Status TdrsRecordedInvestmentOnAccrualStatus	25852000	USD
CY2018Q4	indb	Tdrs Recorded Investment On Nonaccrual Status TdrsRecordedInvestmentOnNonaccrualStatus	29348000	USD
CY2017Q4	indb	Tdrs Recorded Investment On Nonaccrual Status TdrsRecordedInvestmentOnNonaccrualStatus	6067000	USD
CY2018Q4	indb	Financing Receivable Recorded Investment Trouble Debt Restructuring FinancingReceivableRecordedInvestmentTroubleDebtRestructuring	53197000	USD
CY2017Q4	indb	Financing Receivable Recorded Investment Trouble Debt Restructuring FinancingReceivableRecordedInvestmentTroubleDebtRestructuring	31919000	USD
CY2018Q4	indb	Amount Of Specific Reserves Included In Allowance For Loan Losses Associated With Trouble Debt Restructuring AmountOfSpecificReservesIncludedInAllowanceForLoanLossesAssociatedWithTroubleDebtRestructuring	1079000	USD
CY2017Q4	indb	Amount Of Specific Reserves Included In Allowance For Loan Losses Associated With Trouble Debt Restructuring AmountOfSpecificReservesIncludedInAllowanceForLoanLossesAssociatedWithTroubleDebtRestructuring	1342000	USD
CY2018Q4	indb	Additional Commitments To Lend To Borrower For Trouble Debt Restructuring AdditionalCommitmentsToLendToBorrowerForTroubleDebtRestructuring	982000	USD
CY2017Q4	indb	Additional Commitments To Lend To Borrower For Trouble Debt Restructuring AdditionalCommitmentsToLendToBorrowerForTroubleDebtRestructuring	487000	USD
CY2018	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	29	contract
CY2018	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	38898000	USD
CY2018	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	42457000	USD
CY2017	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	54	contract
CY2017	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	8130000	USD
CY2017	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	8175000	USD
CY2016	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	50	contract
CY2016	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	7663000	USD
CY2016	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	7705000	USD
CY2018	indb	Financing Receivable Modifications Post Modification Recorded Investment Extended Maturity FinancingReceivableModificationsPostModificationRecordedInvestmentExtendedMaturity	2878000	USD
CY2017	indb	Financing Receivable Modifications Post Modification Recorded Investment Extended Maturity FinancingReceivableModificationsPostModificationRecordedInvestmentExtendedMaturity	5881000	USD
CY2016	indb	Financing Receivable Modifications Post Modification Recorded Investment Extended Maturity FinancingReceivableModificationsPostModificationRecordedInvestmentExtendedMaturity	5044000	USD
CY2018	indb	Financing Receivable Modifications Post Modification Recorded Investment Adjusted Interest Rate FinancingReceivableModificationsPostModificationRecordedInvestmentAdjustedInterestRate	57000	USD
CY2017	indb	Financing Receivable Modifications Post Modification Recorded Investment Adjusted Interest Rate FinancingReceivableModificationsPostModificationRecordedInvestmentAdjustedInterestRate	0	USD
CY2016	indb	Financing Receivable Modifications Post Modification Recorded Investment Adjusted Interest Rate FinancingReceivableModificationsPostModificationRecordedInvestmentAdjustedInterestRate	92000	USD
CY2018	indb	Financing Receivable Modifications Post Modification Recorded Investment Combination Of Rate And Maturity FinancingReceivableModificationsPostModificationRecordedInvestmentCombinationOfRateAndMaturity	38812000	USD
CY2017	indb	Financing Receivable Modifications Post Modification Recorded Investment Combination Of Rate And Maturity FinancingReceivableModificationsPostModificationRecordedInvestmentCombinationOfRateAndMaturity	568000	USD
CY2016	indb	Financing Receivable Modifications Post Modification Recorded Investment Combination Of Rate And Maturity FinancingReceivableModificationsPostModificationRecordedInvestmentCombinationOfRateAndMaturity	1035000	USD
CY2018	indb	Financing Receivable Modifications Post Modification Recorded Investment Court Ordered Concession FinancingReceivableModificationsPostModificationRecordedInvestmentCourtOrderedConcession	710000	USD
CY2017	indb	Financing Receivable Modifications Post Modification Recorded Investment Court Ordered Concession FinancingReceivableModificationsPostModificationRecordedInvestmentCourtOrderedConcession	1726000	USD
CY2016	indb	Financing Receivable Modifications Post Modification Recorded Investment Court Ordered Concession FinancingReceivableModificationsPostModificationRecordedInvestmentCourtOrderedConcession	1534000	USD
CY2018	indb	Financing Receivable Modifications Post Modification Recorded Investments FinancingReceivableModificationsPostModificationRecordedInvestments	42457000	USD
CY2017	indb	Financing Receivable Modifications Post Modification Recorded Investments FinancingReceivableModificationsPostModificationRecordedInvestments	8175000	USD
CY2016	indb	Financing Receivable Modifications Post Modification Recorded Investments FinancingReceivableModificationsPostModificationRecordedInvestments	7705000	USD
CY2018	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	contract
CY2017	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	122000	USD
CY2016	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	249000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	1079000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	59060000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	68514000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	1079000	USD
CY2018	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	63522000	USD
CY2018	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	1554000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	1342000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	72801000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	79276000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	1342000	USD
CY2017	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	76180000	USD
CY2017	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	2026000	USD
CY2016Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	5214000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	77297000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	81071000	USD
CY2016Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	5214000	USD
CY2016	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	77209000	USD
CY2016	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	2700000	USD
CY2018Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Outstanding Balance CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance	9749000	USD
CY2017Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Outstanding Balance CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance	14485000	USD
CY2017Q4	us-gaap	Certain Loans Acquired In Transfer Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield	1791000	USD
CY2016Q4	us-gaap	Certain Loans Acquired In Transfer Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield	2370000	USD
CY2018	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	1135000	USD
CY2017	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	1475000	USD
CY2018	indb	Certainloansacquiredinatransfernotaccountedforasdebtsecuritiesaccretableyieldadjustmentchangesinexpectedcashflow Certainloansacquiredinatransfernotaccountedforasdebtsecuritiesaccretableyieldadjustmentchangesinexpectedcashflow	310000	USD
CY2017	indb	Certainloansacquiredinatransfernotaccountedforasdebtsecuritiesaccretableyieldadjustmentchangesinexpectedcashflow Certainloansacquiredinatransfernotaccountedforasdebtsecuritiesaccretableyieldadjustmentchangesinexpectedcashflow	748000	USD
CY2018	us-gaap	Certain Loans Acquired In Transfer Accounted For As Debt Securities Accretable Yield Reclassifications From Nonaccretable Difference CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference	225000	USD
CY2017	us-gaap	Certain Loans Acquired In Transfer Accounted For As Debt Securities Accretable Yield Reclassifications From Nonaccretable Difference CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference	148000	USD
CY2018Q4	us-gaap	Certain Loans Acquired In Transfer Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield	1191000	USD
CY2017Q4	us-gaap	Certain Loans Acquired In Transfer Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield	1791000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	182787000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	171227000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	85206000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	76505000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	97581000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	94722000	USD
CY2018	us-gaap	Depreciation Depreciation	9100000	USD
CY2017	us-gaap	Depreciation Depreciation	8500000	USD
CY2016	us-gaap	Depreciation Depreciation	7300000	USD
CY2018	us-gaap	Rental Income Nonoperating RentalIncomeNonoperating	1600000	USD
CY2017	us-gaap	Rental Income Nonoperating RentalIncomeNonoperating	1300000	USD
CY2018	us-gaap	Operating Leases Income Statement Depreciation Expense On Property Subject To Or Held For Lease OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease	1300000	USD
CY2017	us-gaap	Operating Leases Income Statement Depreciation Expense On Property Subject To Or Held For Lease OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease	939000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	256105000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	231806000	USD
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	15250000	USD
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	9341000	USD
CY2018Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	271355000	USD
CY2017Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	241147000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	231806000	USD
CY2016Q4	us-gaap	Goodwill Goodwill	221526000	USD
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	24299000	USD
CY2017	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	10280000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	256105000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	231806000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	37240000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	21990000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	15250000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	29901000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	20560000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	9341000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2700000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3500000	USD
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2800000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	3050000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	2647000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	2394000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1962000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1697000	USD
CY2018	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P10Y
CY2018Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	511292000	USD
CY2018Q4	indb	Time Deposit Maturities Next Twelve Months Percent Of Total TimeDepositMaturitiesNextTwelveMonthsPercentOfTotal	0.719
CY2017Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	393452000	USD
CY2017Q4	indb	Time Deposit Maturities Next Twelve Months Percent Of Total TimeDepositMaturitiesNextTwelveMonthsPercentOfTotal	0.611
CY2018Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	111487000	USD
CY2018Q4	indb	Time Deposit Maturities Year Two Percent Of Total TimeDepositMaturitiesYearTwoPercentOfTotal	0.157
CY2017Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	119341000	USD
CY2017Q4	indb	Time Deposit Maturities Year Two Percent Of Total TimeDepositMaturitiesYearTwoPercentOfTotal	0.185
CY2018Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	41523000	USD
CY2018Q4	indb	Time Deposit Maturities Year Three Percent Of Total TimeDepositMaturitiesYearThreePercentOfTotal	0.058
CY2017Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	57619000	USD
CY2017Q4	indb	Time Deposit Maturities Year Three Percent Of Total TimeDepositMaturitiesYearThreePercentOfTotal	0.089
CY2018Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	27040000	USD
CY2018Q4	indb	Time Deposit Maturities Year Four Percent Of Total TimeDepositMaturitiesYearFourPercentOfTotal	0.038
CY2017Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	41183000	USD
CY2017Q4	indb	Time Deposit Maturities Year Four Percent Of Total TimeDepositMaturitiesYearFourPercentOfTotal	0.064
CY2018Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	19761000	USD
CY2018Q4	indb	Time Deposit Maturities Year Five Percent Of Total TimeDepositMaturitiesYearFivePercentOfTotal	0.028
CY2017Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	32706000	USD
CY2017Q4	indb	Time Deposit Maturities Year Five Percent Of Total TimeDepositMaturitiesYearFivePercentOfTotal	0.051
CY2018Q4	us-gaap	Time Deposits TimeDeposits	711103000	USD
CY2018Q4	indb	Time Deposits Percent Of Total TimeDepositsPercentOfTotal	1.000
CY2017Q4	us-gaap	Time Deposits TimeDeposits	644301000	USD
CY2017Q4	indb	Time Deposits Percent Of Total TimeDepositsPercentOfTotal	1.000
CY2018Q4	us-gaap	Deposit Liabilities Reclassified As Loans Receivable1 DepositLiabilitiesReclassifiedAsLoansReceivable1	3300000	USD
CY2018Q4	us-gaap	Deposit Liabilities Collateral Issued Financial Instruments DepositLiabilitiesCollateralIssuedFinancialInstruments	356800000	USD
CY2017Q4	us-gaap	Deposit Liabilities Collateral Issued Financial Instruments DepositLiabilitiesCollateralIssuedFinancialInstruments	349200000	USD
CY2018Q4	indb	Certificatesof Depositsover250000.00 CertificatesofDepositsover250000.00	104900000	USD
CY2017Q4	indb	Certificatesof Depositsover250000.00 CertificatesofDepositsover250000.00	80000000.0	USD
CY2017Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	52475000	USD
CY2017Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Of Amounts Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate	0.0158
CY2018Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	147046000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Of Amounts Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate	0.0268
CY2017Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From One To Two Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate	0	USD
CY2017Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate One To Two Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate	0
CY2018Q4	us-gaap	Federal Home Loan Bank Advances Branch Of Fhlb Bank Amount Of Advances By Branch FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch	147046000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Advances Weighted Average Interest Rate FederalHomeLoanBankAdvancesWeightedAverageInterestRate	0.0268
CY2017Q4	us-gaap	Federal Home Loan Bank Advances Branch Of Fhlb Bank Amount Of Advances By Branch FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch	52475000	USD
CY2017Q4	us-gaap	Federal Home Loan Bank Advances Weighted Average Interest Rate FederalHomeLoanBankAdvancesWeightedAverageInterestRate	0.0158
CY2018Q4	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	760000	USD
CY2017Q4	us-gaap	Debt Instrument Unamortized Premium DebtInstrumentUnamortizedPremium	789000	USD
CY2018Q4	indb	Total Federal Home Loan Bank Advances TotalFederalHomeLoanBankAdvances	147806000	USD
CY2017Q4	indb	Total Federal Home Loan Bank Advances TotalFederalHomeLoanBankAdvances	53264000	USD
CY2018Q4	indb	Federal Home Loan Bank Advances Weighted Average Interest Rateinclusiveof Swaps FederalHomeLoanBankAdvancesWeightedAverageInterestRateinclusiveofSwaps	0.0255
CY2017Q4	indb	Federal Home Loan Bank Advances Weighted Average Interest Rateinclusiveof Swaps FederalHomeLoanBankAdvancesWeightedAverageInterestRateinclusiveofSwaps	0.0247
CY2018Q4	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	1600000000	USD
CY2017Q4	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	1500000000	USD
CY2018Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	0	USD
CY2017Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	162700000	USD
CY2018	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	248000	USD
CY2017	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	257000	USD
CY2016	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	208000	USD
CY2018Q4	us-gaap	Subordinated Debt SubordinatedDebt	34728000	USD
CY2017Q4	us-gaap	Subordinated Debt SubordinatedDebt	34682000	USD
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	110901000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	107755000	USD
CY2018	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	4200000	USD
CY2017	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	4000000.0	USD
CY2016	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	5800000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	0	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	111291000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	111291000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	121622000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	87204000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	76648000	USD
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27592380	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27294028	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	26404071	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	61428	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	78076	shares
CY2016	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	51847	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	27653808	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	27372104	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26455918	shares
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.41
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.19
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.90
CY2018	indb	Effect Of Dilutive Shares EffectOfDilutiveShares	-0.01
CY2017	indb	Effect Of Dilutive Shares EffectOfDilutiveShares	0
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.40
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.19
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.90
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	4225000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	3333000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	2965000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1188000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1362000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1211000	USD
CY2018Q4	indb	Share Based Compensation Arrangement By Share Based Payment Award Options Price Per Share Common Stock Average High And Low Price Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsPricePerShareCommonStockAverageHighAndLowPriceIntrinsicValue	69.72
CY2018	us-gaap	Maximum Length Of Time Hedged In Interest Rate Cash Flow Hedge1 MaximumLengthOfTimeHedgedInInterestRateCashFlowHedge1	P5Y1M6D
CY2018	indb	Amortization Of Deferred Hedge Gains Losses AmortizationOfDeferredHedgeGainsLosses	231000	USD
CY2017	indb	Amortization Of Deferred Hedge Gains Losses AmortizationOfDeferredHedgeGainsLosses	244000	USD
CY2018Q4	indb	Notionalamountoffairvaluehedgedderivative Notionalamountoffairvaluehedgedderivative	0	USD
CY2018	indb	Change In Fair Value On Loans Held For Sale ChangeInFairValueOnLoansHeldForSale	-51000	USD
CY2017	indb	Change In Fair Value On Loans Held For Sale ChangeInFairValueOnLoansHeldForSale	-113000	USD
CY2016	indb	Change In Fair Value On Loans Held For Sale ChangeInFairValueOnLoansHeldForSale	87000	USD
CY2018	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	3600000	USD
CY2017	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	4700000	USD
CY2016	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	6100000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	1000000	USD
CY2018Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	176000	USD
CY2017Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	4200000	USD
CY2018Q4	indb	Exposureto Institutional Counterparties ExposuretoInstitutionalCounterparties	18400000	USD
CY2017Q4	indb	Exposureto Institutional Counterparties ExposuretoInstitutionalCounterparties	7100000	USD
CY2018Q4	indb	Exposure To Counterparties Relating To Customer Related Positions ExposureToCounterpartiesRelatingToCustomerRelatedPositions	6400000	USD
CY2017Q4	indb	Exposure To Counterparties Relating To Customer Related Positions ExposureToCounterpartiesRelatingToCustomerRelatedPositions	9500000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	26113000	USD
CY2018Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	0	USD
CY2018Q4	us-gaap	Derivative Assets DerivativeAssets	26113000	USD
CY2018Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	6556000	USD
CY2018Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	8528000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	11029000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	17523000	USD
CY2018Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	0	USD
CY2018Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	17523000	USD
CY2018Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	6556000	USD
CY2018Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	173000	USD
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	10794000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	17318000	USD
CY2017Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	0	USD
CY2017Q4	us-gaap	Derivative Assets DerivativeAssets	17318000	USD
CY2017Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	5383000	USD
CY2017Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	0	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	11935000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	15693000	USD
CY2017Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	0	USD
CY2017Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	15693000	USD
CY2017Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	5383000	USD
CY2017Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	3939000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	6371000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	25129000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	28852000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	26549000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	13672000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	9278000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	8883000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	38801000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	38130000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	35432000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3080000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	7953000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	153000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1417000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1258000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-158000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-4497000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	9211000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34304000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	47341000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35427000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	32744000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.2100
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	47091000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.3500
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	39226000	USD
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.3500
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	9633000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0618
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6817000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0507
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5643000	USD
CY2016	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0503
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	130000	USD
CY2018	indb	Effective Income Tax Rate Reconciliation Merger And Other Related Costs EffectiveIncomeTaxRateReconciliationMergerAndOtherRelatedCosts	0.0008
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	213000	USD
CY2017	indb	Effective Income Tax Rate Reconciliation Merger And Other Related Costs EffectiveIncomeTaxRateReconciliationMergerAndOtherRelatedCosts	0.0016
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	210000	USD
CY2016	indb	Effective Income Tax Rate Reconciliation Merger And Other Related Costs EffectiveIncomeTaxRateReconciliationMergerAndOtherRelatedCosts	0.0019
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	49000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.0003
CY2017	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	31000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.0002
CY2016	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	28000	USD
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.0002
CY2018	indb	Effective Income Tax Rate Reconciliation Revaluationof Net Deferred Tax Assets EffectiveIncomeTaxRateReconciliationRevaluationofNetDeferredTaxAssets	0	USD
CY2018	indb	Effective Income Tax Rate Reconciliation Revaluationof Net Deferred Tax Asset Percent EffectiveIncomeTaxRateReconciliationRevaluationofNetDeferredTaxAssetPercent	0
CY2017	indb	Effective Income Tax Rate Reconciliation Revaluationof Net Deferred Tax Assets EffectiveIncomeTaxRateReconciliationRevaluationofNetDeferredTaxAssets	1895000	USD
CY2017	indb	Effective Income Tax Rate Reconciliation Revaluationof Net Deferred Tax Asset Percent EffectiveIncomeTaxRateReconciliationRevaluationofNetDeferredTaxAssetPercent	0.0141
CY2016	indb	Effective Income Tax Rate Reconciliation Revaluationof Net Deferred Tax Assets EffectiveIncomeTaxRateReconciliationRevaluationofNetDeferredTaxAssets	0	USD
CY2016	indb	Effective Income Tax Rate Reconciliation Revaluationof Net Deferred Tax Asset Percent EffectiveIncomeTaxRateReconciliationRevaluationofNetDeferredTaxAssetPercent	0
CY2018	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	3960000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.0254
CY2017	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	3960000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.0294
CY2016	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	6360000	USD
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.0567
CY2018	indb	Effective Income Tax Rate Reconciliation Increasein Cash Surrender Valueof Life Insurance Amount EffectiveIncomeTaxRateReconciliationIncreaseinCashSurrenderValueofLifeInsuranceAmount	1160000	USD
CY2018	indb	Effective Income Tax Rate Reconciliation Increasein Cash Surrender Valueof Life Insurance Percent EffectiveIncomeTaxRateReconciliationIncreaseinCashSurrenderValueofLifeInsurancePercent	0.0074
CY2017	indb	Effective Income Tax Rate Reconciliation Increasein Cash Surrender Valueof Life Insurance Amount EffectiveIncomeTaxRateReconciliationIncreaseinCashSurrenderValueofLifeInsuranceAmount	1445000	USD
CY2017	indb	Effective Income Tax Rate Reconciliation Increasein Cash Surrender Valueof Life Insurance Percent EffectiveIncomeTaxRateReconciliationIncreaseinCashSurrenderValueofLifeInsurancePercent	0.0107
CY2016	indb	Effective Income Tax Rate Reconciliation Increasein Cash Surrender Valueof Life Insurance Amount EffectiveIncomeTaxRateReconciliationIncreaseinCashSurrenderValueofLifeInsuranceAmount	1431000	USD
CY2016	indb	Effective Income Tax Rate Reconciliation Increasein Cash Surrender Valueof Life Insurance Percent EffectiveIncomeTaxRateReconciliationIncreaseinCashSurrenderValueofLifeInsurancePercent	0.0128
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	1030000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	0.0066
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	1253000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	0.0093
CY2016	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	1641000	USD
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Investment EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	0.0146
CY2018	indb	Effective Income Tax Rate Reconciliation Stock Based Compensation Amount EffectiveIncomeTaxRateReconciliationStockBasedCompensationAmount	885000	USD
CY2018	indb	Effective Income Tax Rate Reconciliation Stock Based Compensation Percent EffectiveIncomeTaxRateReconciliationStockBasedCompensationPercent	0.0057
CY2017	indb	Effective Income Tax Rate Reconciliation Stock Based Compensation Amount EffectiveIncomeTaxRateReconciliationStockBasedCompensationAmount	1258000	USD
CY2017	indb	Effective Income Tax Rate Reconciliation Stock Based Compensation Percent EffectiveIncomeTaxRateReconciliationStockBasedCompensationPercent	0.0094
CY2016	indb	Effective Income Tax Rate Reconciliation Stock Based Compensation Amount EffectiveIncomeTaxRateReconciliationStockBasedCompensationAmount	0	USD
CY2016	indb	Effective Income Tax Rate Reconciliation Stock Based Compensation Percent EffectiveIncomeTaxRateReconciliationStockBasedCompensationPercent	0
CY2018	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	566000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.0036
CY2017	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	987000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.0073
CY2016	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	996000	USD
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.0089
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-651000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	-0.0042
CY2017	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	197000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.0015
CY2016	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	748000	USD
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.0067
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	34304000	USD
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2200
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	47341000	USD
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.3520
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	35427000	USD
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.3161
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	11922000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	9268000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	17764000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	16702000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Deferred Gain On Sale Leaseback Transaction DeferredTaxAssetsDeferredGainOnSaleLeasebackTransaction	704000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Deferred Gain On Sale Leaseback Transaction DeferredTaxAssetsDeferredGainOnSaleLeasebackTransaction	909000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	1636000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	1559000	USD
CY2018Q4	indb	Deferred Tax Assets Federal Home Loan Bank Borrowings DeferredTaxAssetsFederalHomeLoanBankBorrowings	15000	USD
CY2017Q4	indb	Deferred Tax Assets Federal Home Loan Bank Borrowings DeferredTaxAssetsFederalHomeLoanBankBorrowings	26000	USD
CY2018Q4	indb	Deferred Tax Asset Loan Fair Value Adjustment DeferredTaxAssetLoanFairValueAdjustment	4761000	USD
CY2017Q4	indb	Deferred Tax Asset Loan Fair Value Adjustment DeferredTaxAssetLoanFairValueAdjustment	3070000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	170000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	127000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	1850000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	106000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	842000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	527000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	39664000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	32294000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	170000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	121000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	39494000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	32173000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	3803000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	2057000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	4759000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	4275000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	2413000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	524000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	5259000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	5270000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	10388000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	10265000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	3483000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	3056000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1139000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1251000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	31244000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	26698000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	8250000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	5475000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	111000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	31000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	142000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	73000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	215000	USD
CY2018	indb	Unrecognized Tax Benefits Increase Resultingfrom Current Period Tax Positionsfederalbenefitofstatetaxamount UnrecognizedTaxBenefitsIncreaseResultingfromCurrentPeriodTaxPositionsfederalbenefitofstatetaxamount	39000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	24000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	18000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	11000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	53000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	29000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	11000	USD
CY2018Q4	indb	Original Investmentin Low Income Housing Projects OriginalInvestmentinLowIncomeHousingProjects	50232000	USD
CY2017Q4	indb	Original Investmentin Low Income Housing Projects OriginalInvestmentinLowIncomeHousingProjects	47399000	USD
CY2016Q4	indb	Original Investmentin Low Income Housing Projects OriginalInvestmentinLowIncomeHousingProjects	47379000	USD
CY2018Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	33681000	USD
CY2017Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	35225000	USD
CY2016Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	39606000	USD
CY2018Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	3935000	USD
CY2017Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	4536000	USD
CY2016Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	12161000	USD
CY2018	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	5407000	USD
CY2017	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	5654000	USD
CY2016	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	5366000	USD
CY2018	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	4377000	USD
CY2017	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	4402000	USD
CY2016	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	3725000	USD
CY2018	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	1030000	USD
CY2017	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	1253000	USD
CY2016	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	1641000	USD
CY2018	indb	Defined Contribution Plan Nondiscretionary Employer Contribution Percent Over Social Security Limit DefinedContributionPlanNondiscretionaryEmployerContributionPercentOverSocialSecurityLimit	0.10
CY2018	indb	Defined Contribution Plan Nondiscretionary Employer Contribution Percent Up To Social Security Limit DefinedContributionPlanNondiscretionaryEmployerContributionPercentUpToSocialSecurityLimit	0.05
CY2018	indb	Multiemployer Plans Period Contributions Significance Of Contributions Percentage MultiemployerPlansPeriodContributionsSignificanceOfContributionsPercentage	0.05
CY2018	us-gaap	Pension Expense PensionExpense	1100000	USD
CY2017	us-gaap	Pension Expense PensionExpense	1900000	USD
CY2016	us-gaap	Pension Expense PensionExpense	2000000.0	USD
CY2018	indb	Defined Benefit Plan Requisite Age DefinedBenefitPlanRequisiteAge	65	age
CY2018	indb	Defined Benefit Plan Requisite Service Period DefinedBenefitPlanRequisiteServicePeriod	P10Y
CY2018	indb	Defined Benefit Plan Death Benefit DefinedBenefitPlanDeathBenefit	5000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	16600000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	16200000	USD
CY2018	indb	Incentive Plans And Discretionary Bonus Expense IncentivePlansAndDiscretionaryBonusExpense	13800000	USD
CY2017	indb	Incentive Plans And Discretionary Bonus Expense IncentivePlansAndDiscretionaryBonusExpense	10900000	USD
CY2016	indb	Incentive Plans And Discretionary Bonus Expense IncentivePlansAndDiscretionaryBonusExpense	10300000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.25
CY2018	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.06
CY2018	indb	Defined Contribution Plan Nondiscretionary Requisite Service Period DefinedContributionPlanNondiscretionaryRequisiteServicePeriod	P1Y
CY2018	indb	Defined Contribution Plan Nondiscretionary Requisiteservicehours DefinedContributionPlanNondiscretionaryRequisiteservicehours	1,000
CY2018	us-gaap	Deferred Compensation Arrangement With Individual Contributions By Employer DeferredCompensationArrangementWithIndividualContributionsByEmployer	142000	USD
CY2017	us-gaap	Deferred Compensation Arrangement With Individual Contributions By Employer DeferredCompensationArrangementWithIndividualContributionsByEmployer	143000	USD
CY2016	us-gaap	Deferred Compensation Arrangement With Individual Contributions By Employer DeferredCompensationArrangementWithIndividualContributionsByEmployer	142000	USD
CY2018	indb	Othernoninterestincome Asc606 OthernoninterestincomeASC606	4432000	USD
CY2017	indb	Othernoninterestincome Asc606 OthernoninterestincomeASC606	4569000	USD
CY2016	indb	Othernoninterestincome Asc606 OthernoninterestincomeASC606	4273000	USD
CY2018	indb	Totalnoninterestincomeinscopeof Asc606 TotalnoninterestincomeinscopeofASC606	68709000	USD
CY2017	indb	Totalnoninterestincomeinscopeof Asc606 TotalnoninterestincomeinscopeofASC606	64259000	USD
CY2016	indb	Totalnoninterestincomeinscopeof Asc606 TotalnoninterestincomeinscopeofASC606	61875000	USD
CY2018	indb	Totalnoninterestincomeoutofscopeof Asc606 TotalnoninterestincomeoutofscopeofASC606	19796000	USD
CY2017	indb	Totalnoninterestincomeoutofscopeof Asc606 TotalnoninterestincomeoutofscopeofASC606	18735000	USD
CY2016	indb	Totalnoninterestincomeoutofscopeof Asc606 TotalnoninterestincomeoutofscopeofASC606	20553000	USD
CY2018	us-gaap	Noninterest Income NoninterestIncome	88505000	USD
CY2017	us-gaap	Noninterest Income NoninterestIncome	82994000	USD
CY2016	us-gaap	Noninterest Income NoninterestIncome	82428000	USD
CY2018Q4	indb	Investment Management Income Receivable InvestmentManagementIncomeReceivable	1893000	USD
CY2017Q4	indb	Investment Management Income Receivable InvestmentManagementIncomeReceivable	1934000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-5923000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-1422000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-4501000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	-5923000	USD
CY2018	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-1422000	USD
CY2018	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-4501000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	7717000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	2169000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	5548000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	1000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	281000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	719000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax	6717000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	1888000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	4829000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	1521000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	428000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	1093000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-372000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-105000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-267000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	276000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	78000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	198000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-2169000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-611000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-1558000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	2963000	USD
CY2016	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	-1832000	USD
CY2016	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-699000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	1077000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1886000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-996000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-321000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-675000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	3000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	2000	USD
CY2017	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	-999000	USD
CY2017	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-322000	USD
CY2017	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-677000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	307000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	125000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	182000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-441000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-180000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-261000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationBeforeTax	748000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	305000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	443000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-995000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-407000	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-588000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-278000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-113000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-165000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	276000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	113000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	163000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	441000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	181000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	260000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-692000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-198000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-494000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-1858000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-710000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-1148000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-26000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-11000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-15000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	1133000	USD
CY2016	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-1133000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	453000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	680000	USD
CY2016	indb	Other Comprehensive Income Loss Reclassification Adjustmentfrom Aoc Ion Borrowings Expensebefore Tax OtherComprehensiveIncomeLossReclassificationAdjustmentfromAOCIonBorrowingsExpensebeforeTax	-2520000	USD
CY2016	indb	Other Comprehensive Income Loss Reclassification Adjustmentfrom Aoc Ion Borrowings Expense Tax OtherComprehensiveIncomeLossReclassificationAdjustmentfromAOCIonBorrowingsExpenseTax	-1030000	USD
CY2016	indb	Other Comprehensive Income Loss Reclassification Adjustmentfrom Aoc Ion Borrowings Expense Netof Tax OtherComprehensiveIncomeLossReclassificationAdjustmentfromAOCIonBorrowingsExpenseNetofTax	-1490000	USD
CY2016	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesBeforeTaxPortionAttributableToParent	3653000	USD
CY2016	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxPortionAttributableToParent	1483000	USD
CY2016	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	2170000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-383000	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-157000	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-226000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-238000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	-97000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	-141000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	276000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	113000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	163000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	-131000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-53000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-78000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	1952000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	837000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1115000	USD
CY2009Q4	indb	Deferred Gain Loss On Cash Flow Hedge DeferredGainLossOnCashFlowHedge	1400000	USD
CY2017Q4	indb	Deferred Gain Loss On Cash Flow Hedge DeferredGainLossOnCashFlowHedge	137000	USD
CY2016Q4	indb	Deferred Gain Loss On Cash Flow Hedge DeferredGainLossOnCashFlowHedge	281000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2452000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1115000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1337000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-494000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1831000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1886000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1173000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	9455000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	9125000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	7617000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	6610000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	4561000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	11556000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	48924000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	9700000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	8600000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	8500000	USD
CY2018Q4	us-gaap	Cash Reserve Deposit Required And Made CashReserveDepositRequiredAndMade	53500000	USD
CY2017Q4	us-gaap	Cash Reserve Deposit Required And Made CashReserveDepositRequiredAndMade	35800000	USD
CY2018	us-gaap	Cash Dividends Paid To Parent Company By Consolidated Subsidiaries CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries	71200000	USD
CY2017	us-gaap	Cash Dividends Paid To Parent Company By Consolidated Subsidiaries CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries	46900000	USD
CY2018Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	73749000	USD
CY2017Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	64407000	USD
CY2018Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	79167000	USD
CY2017Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	68133000	USD
CY2018Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	82875000	USD
CY2017Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	71778000	USD
CY2018Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	87910000	USD
CY2017Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	72876000	USD
CY2018Q1	us-gaap	Interest Expense InterestExpense	5278000	USD
CY2017Q1	us-gaap	Interest Expense InterestExpense	4207000	USD
CY2018Q3	us-gaap	Interest Expense InterestExpense	6641000	USD
CY2017Q3	us-gaap	Interest Expense InterestExpense	4705000	USD
CY2018Q4	us-gaap	Interest Expense InterestExpense	7618000	USD
CY2017Q4	us-gaap	Interest Expense InterestExpense	5044000	USD
CY2018Q1	us-gaap	Noninterest Expense NoninterestExpense	53451000	USD
CY2017Q1	us-gaap	Noninterest Expense NoninterestExpense	48773000	USD
CY2018Q2	us-gaap	Noninterest Expense NoninterestExpense	52688000	USD
CY2017Q2	us-gaap	Noninterest Expense NoninterestExpense	52809000	USD
CY2018Q3	us-gaap	Noninterest Expense NoninterestExpense	55439000	USD
CY2018Q2	us-gaap	Interest Expense InterestExpense	5999000	USD
CY2017Q2	us-gaap	Interest Expense InterestExpense	4378000	USD
CY2018Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	68471000	USD
CY2017Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	60200000	USD
CY2018Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	73168000	USD
CY2017Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	63755000	USD
CY2018Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	76234000	USD
CY2017Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	67073000	USD
CY2018Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	80292000	USD
CY2017Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	67832000	USD
CY2018Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	500000	USD
CY2017Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	600000	USD
CY2018Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	2000000	USD
CY2017Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1050000	USD
CY2018Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1075000	USD
CY2017Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	0	USD
CY2018Q4	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1200000	USD
CY2017Q4	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1300000	USD
CY2018Q1	us-gaap	Noninterest Income NoninterestIncome	19863000	USD
CY2017Q1	us-gaap	Noninterest Income NoninterestIncome	18912000	USD
CY2018Q2	us-gaap	Noninterest Income NoninterestIncome	21887000	USD
CY2017Q2	us-gaap	Noninterest Income NoninterestIncome	21398000	USD
CY2018Q3	us-gaap	Noninterest Income NoninterestIncome	23264000	USD
CY2017Q3	us-gaap	Noninterest Income NoninterestIncome	20770000	USD
CY2018Q4	us-gaap	Noninterest Income NoninterestIncome	23491000	USD
CY2017Q4	us-gaap	Noninterest Income NoninterestIncome	21914000	USD
CY2017Q3	us-gaap	Noninterest Expense NoninterestExpense	51310000	USD
CY2018Q4	us-gaap	Noninterest Expense NoninterestExpense	64391000	USD
CY2017Q4	us-gaap	Noninterest Expense NoninterestExpense	51467000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6828000	USD
CY2017Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9014000	USD
CY2018Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9249000	USD
CY2017Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10731000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9969000	USD
CY2017Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12681000	USD
CY2018Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8258000	USD
CY2017Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14915000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	27555000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	20725000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	31118000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	20563000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	33015000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	23852000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	29934000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	22064000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.00
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.77
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.13
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.20
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.87
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.08
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.80
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.00
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CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.13
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CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.20
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CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.80
CY2018Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27486573	shares
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CY2018Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27526653	shares
CY2017Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27257799	shares
CY2018Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27537841	shares
CY2017Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27436792	shares
CY2018Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27815437	shares
CY2017Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27445739	shares
CY2018Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	67381	shares
CY2017Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	81283	shares
CY2018Q2	indb	Totalunusualorinfrequentexpenseitems Totalunusualorinfrequentexpenseitems	434000	USD
CY2018Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	54525	shares
CY2017Q2	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	74497	shares
CY2018Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	63499	shares
CY2017Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	76307	shares
CY2018Q4	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	58576	shares
CY2017Q4	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	77615	shares
CY2018Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	27553954	shares
CY2017Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	27110923	shares
CY2018Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	27581178	shares
CY2017Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	27332296	shares
CY2018Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	27601340	shares
CY2017Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	27513099	shares
CY2018Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	27874013	shares
CY2017Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	27523354	shares
CY2018Q1	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	0	USD
CY2017Q1	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	484000	USD
CY2018Q2	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	434000	USD
CY2017Q2	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2909000	USD
CY2018Q3	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	2688000	USD
CY2017Q3	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	0	USD
CY2018Q4	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	8046000	USD
CY2018Q1	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	0	USD
CY2017Q1	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	0	USD
CY2018Q2	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	0	USD
CY2017Q2	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	0	USD
CY2018Q3	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	0	USD
CY2017Q3	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	0	USD
CY2018Q1	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	0	USD
CY2017Q1	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	0	USD
CY2018Q2	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	0	USD
CY2017Q2	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	0	USD
CY2018Q3	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	0	USD
CY2017Q3	indb	Tax Expenserelatedtoachangeintaxlaw TaxExpenserelatedtoachangeintaxlaw	0	USD
CY2018Q1	indb	Totalunusualorinfrequentexpenseitems Totalunusualorinfrequentexpenseitems	0	USD
CY2017Q1	indb	Totalunusualorinfrequentexpenseitems Totalunusualorinfrequentexpenseitems	484000	USD
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CY2017Q3	indb	Totalunusualorinfrequentexpenseitems Totalunusualorinfrequentexpenseitems	0	USD
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CY2017Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	52458000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	22795000	USD
CY2018	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	14862000	USD
CY2017	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	36800000	USD
CY2018	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	14057000	USD
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CY2018	us-gaap	Loans And Leases Receivable Related Parties Period Increase Decrease LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease	-12093000	USD
CY2017	us-gaap	Loans And Leases Receivable Related Parties Period Increase Decrease LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease	0	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	41170000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	52458000	USD
CY2018	us-gaap	Related Party Transaction Amounts Of Transaction RelatedPartyTransactionAmountsOfTransaction	31300000	USD
CY2018Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	10800000	USD
CY2017Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	18300000	USD

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INDEPENDENT BANK CORP Stock $indb

2017 Q4 Form 10-K Financial Statement

#000077690119000069 Filed on February 28, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$INDB INDEPENDENT BANK CORP Stock $indb

2017 Q4 Form 10-K Financial Statement

#000077690119000069 Filed on February 28, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$INDB
INDEPENDENT BANK CORP Stock $indb