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OTHER BORROWINGS (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary of other borrowings [Abstract]      
Advances from the FHLB $ 12,464,000us-gaap_AdvancesFromFederalHomeLoanBanks $ 17,181,000us-gaap_AdvancesFromFederalHomeLoanBanks  
Other 6,000ibcp_Borrowings 7,000ibcp_Borrowings  
Total 12,470,000us-gaap_OtherBorrowings 17,188,000us-gaap_OtherBorrowings  
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Federal home loan bank, advances, interest rate, minimum (in hundredths) 135.00%ibcp_FederalHomeLoanBankAdvancesMortgageCollateral    
Federal home loan bank, advances, interest rate, maximum (in hundredths) 159.00%ibcp_FederalHomeLoanBankAdvancesHomeEquityCollateral    
Federal home loan bank stock 12,300,000us-gaap_FederalHomeLoanBankStock    
Unused borrowing capacity with FHLB 170,400,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds    
Interest expense on FHLB advances 900,000us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm 1,100,000us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm 1,200,000us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm
FHLB advances terminated with no gain or loss 0us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresRepaymentAndPenalties 0us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresRepaymentAndPenalties 3,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresRepaymentAndPenalties
FHLB stock as percentages of unpaid principal balance (in hundredths) 1.00%ibcp_FederalHomeLoanBankStockAsPercentagesOfUnpaidPrincipalBalance    
FHLB stock as percentages of outstanding advances (in hundredths) 5.00%ibcp_FederalHomeLoanBankStockAsPercentagesOfOutstandingAdvances    
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]      
Total FHLB advances, Amount 12,464,000us-gaap_AdvancesFromFederalHomeLoanBanks 17,181,000us-gaap_AdvancesFromFederalHomeLoanBanks  
Summary of repayments of FHLB Advances [Abstract]      
Available for sale and loans, pledged to secure other borrowings 753,400,000ibcp_AssetsPledgedAsCollateral    
Federal Reserve Bank Advances [Member]      
Federal Reserve Bank - Short-term borrowings [Line Items]      
Unused borrowing capacity with the FRB 320,000,000ibcp_FederalReserveBankAdvancesGeneralDebtObligationsAmountOfAvailableUnusedFunds
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalReserveBankAdvancesMember
   
Fixed-Rate Advances [Member]      
Summary of other borrowings [Abstract]      
Advances from the FHLB 12,464,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
17,181,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
 
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]      
2014, Amount   4,240,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueInNextRollingTwelveMonths
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
 
2016, Amount 2,205,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
2,313,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
 
2017, Amount 1,320,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
1,377,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
 
2018, Amount 5,671,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
5,888,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
 
2019, Amount 0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
 
2020 and thereafter, Amount 3,268,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
3,363,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
 
Total FHLB advances, Amount 12,464,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
17,181,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
 
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]      
2014, Rate (in hundredths)   5.73%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
 
2016, Rate (in hundredths) 6.55%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
6.55%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
 
2017, Rate (in hundredths) 7.04%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
7.04%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
 
2018, Rate (in hundredths) 5.99%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
5.99%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
 
2020 and thereafter, Rate (in hundredths) 7.49%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAfterFiveYearsFromBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
7.49%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAfterFiveYearsFromBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
 
Total FHLB advances, Rate (in hundredths) 6.59%ibcp_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsAsOfBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
6.38%ibcp_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsAsOfBalanceSheetDate
/ ibcp_FederalHomeLoanBankAdvancesInterestRateAxis
= ibcp_FederalHomeLoanBankAdvancesFixedRateMember
 
Advances from Federal Home Loan Bank ("FHLB") [Member]      
Summary of repayments of FHLB Advances [Abstract]      
2015 515,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
   
2016 2,521,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
   
2017 1,587,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
   
2018 5,042,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
   
2019 143,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
   
2020 and thereafter 2,656,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
   
Total $ 12,464,000us-gaap_LongTermDebt
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankAdvancesMember