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Derivative Financial Instruments, Effect on Statement of Operations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash Flow Hedge [Member]    
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]    
Gain (Loss) Recognized in Other Comprehensive Income (Loss) (Effective Portion) $ 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_CashFlowHedgingMember		 $ 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_CashFlowHedgingMember
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) 0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_CashFlowHedgingMember		 (95)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_CashFlowHedgingMember
Gain (Loss) Recognized in Income 0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_CashFlowHedgingMember		 [1] 0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_CashFlowHedgingMember		 [1]
Cash Flow Hedge [Member] | Fixed Income Interest Rate [Member] | Interest Rate Swap [Member]    
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]    
Gain (Loss) Recognized in Other Comprehensive Income (Loss) (Effective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember		 [2] 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember		 [2]
Gain (Loss) Recognized in Income 0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember		 [1] 0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember		 [1]
Cash Flow Hedge [Member] | Fixed Income Interest Rate [Member] | Interest Rate Swap [Member] | Interest Expense [Member]    
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]    
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) 0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember		 (95)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember
No Hedge Designation [Member]    
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]    
Gain (Loss) Recognized in Income 349us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1] (97)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
No Hedge Designation [Member] | Rate-Lock Mortgage Loan Commitments [Member] | Net Mortgage Loan Gains [Member]    
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]    
Gain (Loss) Recognized in Income 388us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= ibcp_NetMortgageLoanGainsMember		 [1] (14)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= ibcp_NetMortgageLoanGainsMember		 [1]
No Hedge Designation [Member] | Mandatory Commitments to Sell Mortgage Loans [Member] | Net Mortgage Loan Gains [Member]    
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]    
Gain (Loss) Recognized in Income (39)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= ibcp_MandatoryCommitmentsToSellMortgageLoansMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= ibcp_NetMortgageLoanGainsMember		 [1] (83)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= ibcp_MandatoryCommitmentsToSellMortgageLoansMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= ibcp_NetMortgageLoanGainsMember		 [1]
No Hedge Designation [Member] | Fixed Income Interest Rate [Member] | Interest Rate Swap [Member] | Interest Income [Member]    
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]    
Gain (Loss) Recognized in Income (261)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember		 [1] 0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_FixedIncomeInterestRateMember		 [1]
No Hedge Designation [Member] | Variable Income Interest Rate [Member] | Interest Rate Swap [Member] | Interest Income [Member]    
Effect of derivative financial instruments on the condensed consolidated financial statements of operations [Abstract]    
Gain (Loss) Recognized in Income $ 261us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_VariableIncomeInterestRateMember		 [1] $ 0us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestIncomeMember
/ us-gaap_TradingActivityByTypeAxis
= us-gaap_VariableIncomeInterestRateMember		 [1]
[1] For cash flow hedges, this location and amount refers to the ineffective portion.
[2] Relates to a terminated pay-fixed interest rate swap whose termination fee was included in accumulated other comprehensive income and was being amortized into earnings through December 31, 2014.