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Fair Value Disclosures, Part 2 (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Impairment charges recognized [Abstract]      
Capitalized mortgage loan servicing rights, carrying amount $ 8,100,000ibcp_CapitalizedMortgageLoanServicingRightsCarryingAmount   $ 9,200,000ibcp_CapitalizedMortgageLoanServicingRightsCarryingAmount
Capitalized mortgage loan servicing rights, valuation allowance 4,500,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance   3,800,000us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance
Capitalized mortgage loan servicing rights, additional charges 700,000ibcp_CapitalizedMortgageLoanServicingRightsAdditionalCharges 300,000ibcp_CapitalizedMortgageLoanServicingRightsAdditionalCharges  
Collateral dependent loans, carrying amount 7,600,000ibcp_CollateralDependentLoansCarryingAmount   8,200,000ibcp_CollateralDependentLoansCarryingAmount
Collateral dependent loans, valuation allowance 2,800,000ibcp_CollateralDependentLoansValuationAllowance   3,100,000ibcp_CollateralDependentLoansValuationAllowance
Additional provision for loan losses on impaired loans 600,000us-gaap_ProvisionForDoubtfulAccounts 1,500,000us-gaap_ProvisionForDoubtfulAccounts  
Other real estate, carrying amount 1,200,000us-gaap_OtherRealEstate   1,900,000us-gaap_OtherRealEstate
Other real estate, valuation allowance 2,500,000us-gaap_RealEstateOwnedValuationAllowance   2,500,000us-gaap_RealEstateOwnedValuationAllowance
Other real estate, additional charge 200,000us-gaap_AssetImpairmentCharges 100,000us-gaap_AssetImpairmentCharges  
Impaired Loans Commercial [Member]      
Impairment charges recognized [Abstract]      
Total impaired collateral value 1,000,000ibcp_ImpairmentCollateralDependentOtherThanRealEstate
/ ibcp_ClassOfAssetForValuationTechniqueAxis
= ibcp_ImpairedLoansCommercialMember
  1,100,000ibcp_ImpairmentCollateralDependentOtherThanRealEstate
/ ibcp_ClassOfAssetForValuationTechniqueAxis
= ibcp_ImpairedLoansCommercialMember
Impaired Loans Commercial [Member] | Minimum [Member]      
Impairment charges recognized [Abstract]      
Discount rate (in hundredths) 20.00%us-gaap_FairValueInputsDiscountRate
/ ibcp_ClassOfAssetForValuationTechniqueAxis
= ibcp_ImpairedLoansCommercialMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Impaired Loans Commercial [Member] | Maximum [Member]      
Impairment charges recognized [Abstract]      
Discount rate (in hundredths) 100.00%us-gaap_FairValueInputsDiscountRate
/ ibcp_ClassOfAssetForValuationTechniqueAxis
= ibcp_ImpairedLoansCommercialMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Trading Securities [Member]      
Changes in fair value for financial assets [Abstract]      
Net Gains (Losses) on Assets 10,000ibcp_FairValueOptionChangesInFairValueGainLoss2
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
112,000ibcp_FairValueOptionChangesInFairValueGainLoss2
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
 
Total Change in Fair Values Included in Current Period Earnings 10,000us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
112,000us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_TradingAccountAssetsMember
 
Loans Held For Sale [Member]      
Changes in fair value for financial assets [Abstract]      
Net Gains (Losses) on Assets 209,000ibcp_FairValueOptionChangesInFairValueGainLoss2
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
30,000ibcp_FairValueOptionChangesInFairValueGainLoss2
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
 
Total Change in Fair Values Included in Current Period Earnings $ 209,000us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember
$ 30,000us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_LoansReceivableMember