Annual report pursuant to Section 13 and 15(d)

OTHER BORROWED FUNDS (Details)

v2.4.1.9
OTHER BORROWED FUNDS (Details) (USD $)
3 Months Ended
Jun. 30, 2013
Loan
Dec. 31, 2014
Dec. 31, 2013
Advances from Federal Home Loan Bank [Abstract]      
Advance amount   $ 88,107,000us-gaap_AdvancesFromFederalHomeLoanBanks $ 89,991,000us-gaap_AdvancesFromFederalHomeLoanBanks
Residential and commercial real estate loans pledged as collateral for Federal Home Loan Bank advances   441,252,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 411,715,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
Number of existing FHLB advances modified 6mcbc_NumberOfExistingFhlbAdvancesModified    
Amount of modified FHLB advances 60,000,000mcbc_AmountOfModifiedFhlbAdvances    
Weighted average maturity before modification of advances 3 years 2 months 19 days    
Weighted average maturity after modification of advances 4 years 10 months 10 days    
Weighted average interest rate before modification (in hundredths) 1.95%mcbc_WeightedAverageInterestRateBeforeModification    
Weighted average interest rate after modification (in hundredths) 1.94%mcbc_WeightedAverageInterestRateAfterModification    
Scheduled repayments of FHLB advances [Abstract]      
2015   1,938,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate  
2016   21,996,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate  
2017   2,055,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate  
2018   52,118,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate  
2019   10,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate  
Thereafter   0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate  
Total   88,107,000us-gaap_AdvancesFromFederalHomeLoanBanks 89,991,000us-gaap_AdvancesFromFederalHomeLoanBanks
Federal Reserve Bank borrowings [Abstract]      
Unused borrowing capacity to Federal Reserve Bank   22,800,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount 22,700,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Commercial and mortgage loans pledged to the Federal Reserve Bank   25,900,000us-gaap_LoansPledgedAsCollateral 26,600,000us-gaap_LoansPledgedAsCollateral
Single Maturity Fixed Rate Advances [Member]      
Advances from Federal Home Loan Bank [Abstract]      
Advance amount   80,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ mcbc_FederalHomeLoanBankAdvancesTypeOfAdvancesAxis
= mcbc_SingleMaturityFixedRateAdvancesMember
80,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ mcbc_FederalHomeLoanBankAdvancesTypeOfAdvancesAxis
= mcbc_SingleMaturityFixedRateAdvancesMember
Range of maturities, earliest   2016 2016
Range of maturities, last   2019 2019
Weighted average interest rate (in hundredths)   1.69%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ mcbc_FederalHomeLoanBankAdvancesTypeOfAdvancesAxis
= mcbc_SingleMaturityFixedRateAdvancesMember
1.69%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ mcbc_FederalHomeLoanBankAdvancesTypeOfAdvancesAxis
= mcbc_SingleMaturityFixedRateAdvancesMember
Scheduled repayments of FHLB advances [Abstract]      
Total   80,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ mcbc_FederalHomeLoanBankAdvancesTypeOfAdvancesAxis
= mcbc_SingleMaturityFixedRateAdvancesMember
80,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ mcbc_FederalHomeLoanBankAdvancesTypeOfAdvancesAxis
= mcbc_SingleMaturityFixedRateAdvancesMember
Amortizable Mortgage Advances [Member]      
Advances from Federal Home Loan Bank [Abstract]      
Advance amount   8,107,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ mcbc_FederalHomeLoanBankAdvancesTypeOfAdvancesAxis
= mcbc_AmortizableMortgageAdvancesMember
9,991,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ mcbc_FederalHomeLoanBankAdvancesTypeOfAdvancesAxis
= mcbc_AmortizableMortgageAdvancesMember
Range of maturities, earliest   2018 2018
Range of maturities, last   2018 2018
Weighted average interest rate (in hundredths)   3.78%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ mcbc_FederalHomeLoanBankAdvancesTypeOfAdvancesAxis
= mcbc_AmortizableMortgageAdvancesMember
3.78%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ mcbc_FederalHomeLoanBankAdvancesTypeOfAdvancesAxis
= mcbc_AmortizableMortgageAdvancesMember
Scheduled repayments of FHLB advances [Abstract]      
Total   $ 8,107,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ mcbc_FederalHomeLoanBankAdvancesTypeOfAdvancesAxis
= mcbc_AmortizableMortgageAdvancesMember
$ 9,991,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ mcbc_FederalHomeLoanBankAdvancesTypeOfAdvancesAxis
= mcbc_AmortizableMortgageAdvancesMember