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FAIR VALUE DISCLOSURES, Part 1 (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
FAIR VALUE DISCLOSURES [Abstract]    
Value of collateral-dependent impaired loans that will be reviewed by independent third party, minimum $ 250,000ibcp_ValueOfCollateralDependentImpairedLoansThatWillBeReviewedByIndependentThirdPartyMinimum  
Value of collateral-dependent impaired loans that will be reviewed by special assets group, maximum 250,000ibcp_ValueOfCollateralDependentImpairedLoansThatWillBeReviewedBySpecialAssetsGroupMaximum  
Assets [Abstract]    
Trading securities 203,000us-gaap_TradingSecurities 498,000us-gaap_TradingSecurities
Securities available for sale 533,178,000us-gaap_AvailableForSaleSecurities 462,481,000us-gaap_AvailableForSaleSecurities
U.S. Agency [Member]    
Assets [Abstract]    
Securities available for sale 35,006,000us-gaap_AvailableForSaleSecurities
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= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
31,808,000us-gaap_AvailableForSaleSecurities
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= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
U.S. Agency Residential Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 257,558,000us-gaap_AvailableForSaleSecurities
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203,460,000us-gaap_AvailableForSaleSecurities
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U.S. Agency Commercial Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 33,728,000us-gaap_AvailableForSaleSecurities
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Private Label Residential Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 6,013,000us-gaap_AvailableForSaleSecurities
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6,788,000us-gaap_AvailableForSaleSecurities
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Other Asset Backed [Member]    
Assets [Abstract]    
Securities available for sale 32,353,000us-gaap_AvailableForSaleSecurities
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45,185,000us-gaap_AvailableForSaleSecurities
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= us-gaap_AssetBackedSecuritiesMember
Obligations of States and Political Subdivisions [Member]    
Assets [Abstract]    
Securities available for sale 143,415,000us-gaap_AvailableForSaleSecurities
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153,678,000us-gaap_AvailableForSaleSecurities
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Corporate [Member]    
Assets [Abstract]    
Securities available for sale 22,664,000us-gaap_AvailableForSaleSecurities
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19,137,000us-gaap_AvailableForSaleSecurities
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Trust Preferred [Member]    
Assets [Abstract]    
Securities available for sale 2,441,000us-gaap_AvailableForSaleSecurities
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2,425,000us-gaap_AvailableForSaleSecurities
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Fair Value Measurements [Member] | Fair Value, Measurements, Recurring [Member]    
Assets [Abstract]    
Trading securities 203,000us-gaap_TradingSecurities
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498,000us-gaap_TradingSecurities
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Loans held for sale 23,662,000us-gaap_LoansHeldForSaleFairValueDisclosure
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20,390,000us-gaap_LoansHeldForSaleFairValueDisclosure
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Derivatives 619,000us-gaap_DerivativeAssets
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[1] 494,000us-gaap_DerivativeAssets
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[1]
Liabilities [Abstract]    
Derivatives 366,000us-gaap_DerivativeLiabilities
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[2] 0us-gaap_DerivativeLiabilities
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[2]
Fair Value Measurements [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Agency [Member]    
Assets [Abstract]    
Securities available for sale 35,006,000us-gaap_AvailableForSaleSecurities
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31,808,000us-gaap_AvailableForSaleSecurities
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Fair Value Measurements [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Agency Residential Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 257,558,000us-gaap_AvailableForSaleSecurities
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203,460,000us-gaap_AvailableForSaleSecurities
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Fair Value Measurements [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Agency Commercial Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 33,728,000us-gaap_AvailableForSaleSecurities
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Fair Value Measurements [Member] | Fair Value, Measurements, Recurring [Member] | Private Label Residential Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 6,013,000us-gaap_AvailableForSaleSecurities
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6,788,000us-gaap_AvailableForSaleSecurities
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Fair Value Measurements [Member] | Fair Value, Measurements, Recurring [Member] | Other Asset Backed [Member]    
Assets [Abstract]    
Securities available for sale 32,353,000us-gaap_AvailableForSaleSecurities
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45,185,000us-gaap_AvailableForSaleSecurities
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Fair Value Measurements [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]    
Assets [Abstract]    
Securities available for sale 143,415,000us-gaap_AvailableForSaleSecurities
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153,678,000us-gaap_AvailableForSaleSecurities
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Fair Value Measurements [Member] | Fair Value, Measurements, Recurring [Member] | Corporate [Member]    
Assets [Abstract]    
Securities available for sale 22,664,000us-gaap_AvailableForSaleSecurities
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19,137,000us-gaap_AvailableForSaleSecurities
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Fair Value Measurements [Member] | Fair Value, Measurements, Recurring [Member] | Trust Preferred [Member]    
Assets [Abstract]    
Securities available for sale 2,441,000us-gaap_AvailableForSaleSecurities
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2,425,000us-gaap_AvailableForSaleSecurities
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Fair Value Measurements [Member] | Fair Value, Measurements, Nonrecurring [Member]    
ASSETS [Abstract]    
Capitalized mortgage loan servicing rights 9,197,000ibcp_CapitalizedMortgageLoanServicingRightsFairValueDisclosure
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[3] 7,773,000ibcp_CapitalizedMortgageLoanServicingRightsFairValueDisclosure
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[3]
Fair Value Measurements [Member] | Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]    
Commercial [Abstract]    
Income producing - real estate 869,000ibcp_IncomeProducingRealEstateFairValueDisclosure
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[4] 1,997,000ibcp_IncomeProducingRealEstateFairValueDisclosure
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[4]
Land, land development & construction - real estate 354,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
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[4] 673,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
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Commercial and industrial 2,601,000us-gaap_LoansReceivableCommercialAndIndustrial
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[4] 2,927,000us-gaap_LoansReceivableCommercialAndIndustrial
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[4]
Mortgage [Abstract]    
1-4 Family 1,306,000ibcp_Family1To4FairValueDisclosure
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[4] 1,455,000ibcp_Family1To4FairValueDisclosure
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[4]
Resort Lending   340,000ibcp_ResortLendingFairValueDisclosure
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[4]
Commercial [Abstract]    
Income producing - real estate 869,000ibcp_IncomeProducingRealEstateFairValueDisclosure
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[4] 1,997,000ibcp_IncomeProducingRealEstateFairValueDisclosure
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Land, land development & construction - real estate 354,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
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[4] 673,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
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Commercial and industrial 2,601,000us-gaap_LoansReceivableCommercialAndIndustrial
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[4] 2,927,000us-gaap_LoansReceivableCommercialAndIndustrial
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[4]
Mortgage [Abstract]    
1-4 Family 1,306,000ibcp_Family1To4FairValueDisclosure
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[4] 1,455,000ibcp_Family1To4FairValueDisclosure
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Resort Lending   340,000ibcp_ResortLendingFairValueDisclosure
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[4]
Fair Value Measurements [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate [Member]    
Commercial [Abstract]    
Income producing - real estate 479,000ibcp_IncomeProducingRealEstateFairValueDisclosure
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[5] 559,000ibcp_IncomeProducingRealEstateFairValueDisclosure
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[5]
Land, land development & construction - real estate 737,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
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[5] 1,047,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
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[5]
Mortgage [Abstract]    
1-4 Family 102,000ibcp_Family1To4FairValueDisclosure
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[5] 337,000ibcp_Family1To4FairValueDisclosure
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Resort Lending 575,000ibcp_ResortLendingFairValueDisclosure
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[5] 1,257,000ibcp_ResortLendingFairValueDisclosure
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[5]
Commercial [Abstract]    
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[5]
Land, land development & construction - real estate 737,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
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[5]
Mortgage [Abstract]    
1-4 Family 102,000ibcp_Family1To4FairValueDisclosure
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[5] 337,000ibcp_Family1To4FairValueDisclosure
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[5]
Resort Lending 575,000ibcp_ResortLendingFairValueDisclosure
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[5] 1,257,000ibcp_ResortLendingFairValueDisclosure
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[5]
Installment [Abstract]    
Home equity - 1st lien 13,000ibcp_HomeEquityInstallment1StLienFairValueDisclosure
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[5] 29,000ibcp_HomeEquityInstallment1StLienFairValueDisclosure
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[5]
Payment plan receivables [Abstract]    
Full refund/partial refund   2,668,000ibcp_FullRefundPartialRefundFairValueDisclosure
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[5]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets [Abstract]    
Trading securities 203,000us-gaap_TradingSecurities
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0us-gaap_DerivativeAssets
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Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]    
Assets [Abstract]    
Trading securities 203,000us-gaap_TradingSecurities
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498,000us-gaap_TradingSecurities
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[1]
Liabilities [Abstract]    
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[2]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Agency [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
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Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Agency Residential Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
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Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Agency Commercial Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
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Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Private Label Residential Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
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Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
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Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
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Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Corporate [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
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Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Trust Preferred [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
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Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Nonrecurring [Member]    
ASSETS [Abstract]    
Capitalized mortgage loan servicing rights 0ibcp_CapitalizedMortgageLoanServicingRightsFairValueDisclosure
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[3]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]    
Commercial [Abstract]    
Income producing - real estate 0ibcp_IncomeProducingRealEstateFairValueDisclosure
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[4]
Land, land development & construction - real estate 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
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[4] 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
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[4]
Commercial and industrial 0us-gaap_LoansReceivableCommercialAndIndustrial
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[4]
Mortgage [Abstract]    
1-4 Family 0ibcp_Family1To4FairValueDisclosure
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[4] 0ibcp_Family1To4FairValueDisclosure
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[4]
Resort Lending   0ibcp_ResortLendingFairValueDisclosure
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[4]
Commercial [Abstract]    
Income producing - real estate 0ibcp_IncomeProducingRealEstateFairValueDisclosure
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[4] 0ibcp_IncomeProducingRealEstateFairValueDisclosure
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[4]
Land, land development & construction - real estate 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
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[4]
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[4]
Mortgage [Abstract]    
1-4 Family 0ibcp_Family1To4FairValueDisclosure
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[4] 0ibcp_Family1To4FairValueDisclosure
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[4]
Resort Lending   0ibcp_ResortLendingFairValueDisclosure
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[4]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate [Member]    
Commercial [Abstract]    
Income producing - real estate 0ibcp_IncomeProducingRealEstateFairValueDisclosure
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[5] 0ibcp_IncomeProducingRealEstateFairValueDisclosure
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[5]
Land, land development & construction - real estate 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
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[5] 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
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[5]
Mortgage [Abstract]    
1-4 Family 0ibcp_Family1To4FairValueDisclosure
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[5] 0ibcp_Family1To4FairValueDisclosure
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[5]
Resort Lending 0ibcp_ResortLendingFairValueDisclosure
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[5] 0ibcp_ResortLendingFairValueDisclosure
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[5]
Commercial [Abstract]    
Income producing - real estate 0ibcp_IncomeProducingRealEstateFairValueDisclosure
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[5] 0ibcp_IncomeProducingRealEstateFairValueDisclosure
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[5]
Land, land development & construction - real estate 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
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[5] 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
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[5]
Mortgage [Abstract]    
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[5] 0ibcp_Family1To4FairValueDisclosure
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[5]
Resort Lending 0ibcp_ResortLendingFairValueDisclosure
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= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 0ibcp_ResortLendingFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Installment [Abstract]    
Home equity - 1st lien 0ibcp_HomeEquityInstallment1StLienFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 0ibcp_HomeEquityInstallment1StLienFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Payment plan receivables [Abstract]    
Full refund/partial refund   0ibcp_FullRefundPartialRefundFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Significant Other Observable Inputs (Level 2) [Member]    
Assets [Abstract]    
Trading securities 0us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Securities available for sale 533,178,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
462,481,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Derivatives 619,000us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
494,000us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Liabilities [Abstract]    
Derivatives 366,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]    
Assets [Abstract]    
Trading securities 0us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
0us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Loans held for sale 23,662,000us-gaap_LoansHeldForSaleFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
20,390,000us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Derivatives 619,000us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
[1] 494,000us-gaap_DerivativeAssets
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
[1]
Liabilities [Abstract]    
Derivatives 366,000us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
[2] 0us-gaap_DerivativeLiabilities
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
[2]
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Agency [Member]    
Assets [Abstract]    
Securities available for sale 35,006,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
31,808,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Agency Residential Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 257,558,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
203,460,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Agency Commercial Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 33,728,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Private Label Residential Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 6,013,000us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
6,788,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Other Asset Backed [Member]    
Assets [Abstract]    
Securities available for sale 32,353,000us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
45,185,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]    
Assets [Abstract]    
Securities available for sale 143,415,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
153,678,000us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Corporate [Member]    
Assets [Abstract]    
Securities available for sale 22,664,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
19,137,000us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Trust Preferred [Member]    
Assets [Abstract]    
Securities available for sale 2,441,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
2,425,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Nonrecurring [Member]    
ASSETS [Abstract]    
Capitalized mortgage loan servicing rights 0ibcp_CapitalizedMortgageLoanServicingRightsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[3] 0ibcp_CapitalizedMortgageLoanServicingRightsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[3]
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]    
Commercial [Abstract]    
Income producing - real estate 0ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 0ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Land, land development & construction - real estate 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Commercial and industrial 0us-gaap_LoansReceivableCommercialAndIndustrial
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= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 0us-gaap_LoansReceivableCommercialAndIndustrial
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Mortgage [Abstract]    
1-4 Family 0ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 0ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Resort Lending   0ibcp_ResortLendingFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Commercial [Abstract]    
Income producing - real estate 0ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 0ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Land, land development & construction - real estate 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Commercial and industrial 0us-gaap_LoansReceivableCommercialAndIndustrial
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= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 0us-gaap_LoansReceivableCommercialAndIndustrial
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Mortgage [Abstract]    
1-4 Family 0ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 0ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Resort Lending   0ibcp_ResortLendingFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate [Member]    
Commercial [Abstract]    
Income producing - real estate 0ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 0ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Land, land development & construction - real estate 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Mortgage [Abstract]    
1-4 Family 0ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 0ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Resort Lending 0ibcp_ResortLendingFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 0ibcp_ResortLendingFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Commercial [Abstract]    
Income producing - real estate 0ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 0ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Land, land development & construction - real estate 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 0ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Mortgage [Abstract]    
1-4 Family 0ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 0ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Resort Lending 0ibcp_ResortLendingFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 0ibcp_ResortLendingFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Installment [Abstract]    
Home equity - 1st lien 0ibcp_HomeEquityInstallment1StLienFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 0ibcp_HomeEquityInstallment1StLienFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Payment plan receivables [Abstract]    
Full refund/partial refund   0ibcp_FullRefundPartialRefundFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Significant Unobservable Inputs (Level 3) [Member]    
Assets [Abstract]    
Trading securities 0us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Securities available for sale 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Derivatives 0us-gaap_DerivativeAssets
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= us-gaap_FairValueInputsLevel3Member
0us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Liabilities [Abstract]    
Derivatives 0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
ASSETS [Abstract]    
Capitalized mortgage loan servicing rights 9,197,000ibcp_CapitalizedMortgageLoanServicingRightsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
7,773,000ibcp_CapitalizedMortgageLoanServicingRightsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]    
Assets [Abstract]    
Trading securities 0us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
0us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
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= us-gaap_FairValueMeasurementsRecurringMember
Loans held for sale 0us-gaap_LoansHeldForSaleFairValueDisclosure
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= us-gaap_FairValueMeasurementsRecurringMember
0us-gaap_LoansHeldForSaleFairValueDisclosure
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Derivatives 0us-gaap_DerivativeAssets
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
[1] 0us-gaap_DerivativeAssets
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= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
[1]
Liabilities [Abstract]    
Derivatives 0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
[2] 0us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
[2]
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Agency [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Agency Residential Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Agency Commercial Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Private Label Residential Mortgage-Backed [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Other Asset Backed [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
0us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Corporate [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Trust Preferred [Member]    
Assets [Abstract]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]    
ASSETS [Abstract]    
Capitalized mortgage loan servicing rights 9,197,000ibcp_CapitalizedMortgageLoanServicingRightsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[3] 7,773,000ibcp_CapitalizedMortgageLoanServicingRightsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[3]
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]    
Commercial [Abstract]    
Income producing - real estate 869,000ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 1,997,000ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Land, land development & construction - real estate 354,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 673,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Commercial and industrial 2,601,000us-gaap_LoansReceivableCommercialAndIndustrial
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 2,927,000us-gaap_LoansReceivableCommercialAndIndustrial
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Mortgage [Abstract]    
1-4 Family 1,306,000ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 1,455,000ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Resort Lending   340,000ibcp_ResortLendingFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Commercial [Abstract]    
Income producing - real estate 869,000ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 1,997,000ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Land, land development & construction - real estate 354,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 673,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Commercial and industrial 2,601,000us-gaap_LoansReceivableCommercialAndIndustrial
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 2,927,000us-gaap_LoansReceivableCommercialAndIndustrial
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Mortgage [Abstract]    
1-4 Family 1,306,000ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4] 1,455,000ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Resort Lending   340,000ibcp_ResortLendingFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[4]
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate [Member]    
Commercial [Abstract]    
Income producing - real estate 479,000ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 559,000ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Land, land development & construction - real estate 737,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 1,047,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Mortgage [Abstract]    
1-4 Family 102,000ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 337,000ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Resort Lending 575,000ibcp_ResortLendingFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 1,257,000ibcp_ResortLendingFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Commercial [Abstract]    
Income producing - real estate 479,000ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 559,000ibcp_IncomeProducingRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Land, land development & construction - real estate 737,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 1,047,000ibcp_LandLandDevelopmentAndConstructionRealEstateFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Mortgage [Abstract]    
1-4 Family 102,000ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 337,000ibcp_Family1To4FairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Resort Lending 575,000ibcp_ResortLendingFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 1,257,000ibcp_ResortLendingFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Installment [Abstract]    
Home equity - 1st lien 13,000ibcp_HomeEquityInstallment1StLienFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5] 29,000ibcp_HomeEquityInstallment1StLienFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
Payment plan receivables [Abstract]    
Full refund/partial refund   $ 2,668,000ibcp_FullRefundPartialRefundFairValueDisclosure
/ ibcp_AssetLoanClassAxis
= ibcp_OtherRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
[5]
[1] Included in accrued income and other assets
[2] Included in accrued expenses and other liabilities
[3] Only includes servicing rights that are carried at fair value due to recognition of a valuation allowance.
[4] Only includes impaired loans with specific loss allocations based on collateral value.
[5] Only includes other real estate with subsequent write downs to fair value.