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FAIR VALUE DISCLOSURES, Part 3 (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair value option - Loans held for sale [Abstract]      
Loans held for sale $ 23,662us-gaap_LoansReceivableHeldForSaleAmount $ 20,390us-gaap_LoansReceivableHeldForSaleAmount  
Difference 624us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables 366us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables 1,843us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
Aggregate Fair Value [Member]      
Fair value option - Loans held for sale [Abstract]      
Loans held for sale 23,662us-gaap_LoansReceivableHeldForSaleAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 20,390us-gaap_LoansReceivableHeldForSaleAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 47,487us-gaap_LoansReceivableHeldForSaleAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Contractual Principal [Member]      
Fair value option - Loans held for sale [Abstract]      
Loans held for sale $ 23,038us-gaap_LoansReceivableHeldForSaleAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= ibcp_ContractualPrincipalOfFairValueOptionElectedInstrumentsMember		 $ 20,024us-gaap_LoansReceivableHeldForSaleAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= ibcp_ContractualPrincipalOfFairValueOptionElectedInstrumentsMember		 $ 45,644us-gaap_LoansReceivableHeldForSaleAmount
/ us-gaap_FairValueByMeasurementBasisAxis
= ibcp_ContractualPrincipalOfFairValueOptionElectedInstrumentsMember