Quarterly report pursuant to Section 13 or 15(d)

OTHER BORROWED FUNDS (Details)

v2.4.1.9
OTHER BORROWED FUNDS (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Advances from Federal Home Loan Bank [Abstract]    
Advance amount $ 96,836,000us-gaap_AdvancesFromFederalHomeLoanBanks $ 88,107,000us-gaap_AdvancesFromFederalHomeLoanBanks
Residential and commercial real estate loans pledged as collateral for Federal Home Loan Bank advances 434,103,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 441,252,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
Scheduled repayments of FHLB advances [Abstract]    
2015 667,000us-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 10,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate  
Total 96,836,000us-gaap_AdvancesFromFederalHomeLoanBanks 88,107,000us-gaap_AdvancesFromFederalHomeLoanBanks
Federal Reserve Bank borrowings [Abstract]    
Unused borrowing capacity to Federal Reserve Bank 22,800,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount 22,800,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Commercial and mortgage loans pledged to the Federal Reserve Bank 25,900,000us-gaap_LoansPledgedAsCollateral 25,900,000us-gaap_LoansPledgedAsCollateral
Single Maturity Fixed Rate Advances [Member]    
Advances from Federal Home Loan Bank [Abstract]    
Advance amount 90,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_LongtermDebtTypeAxis
= mcbc_SingleMaturityFixedRateAdvancesMember
80,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_LongtermDebtTypeAxis
= mcbc_SingleMaturityFixedRateAdvancesMember
Range of maturities, earliest 2016 2016
Range of maturities, last 2020 2019
Weighted average interest rate (in hundredths) 1.69%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mcbc_SingleMaturityFixedRateAdvancesMember
1.69%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mcbc_SingleMaturityFixedRateAdvancesMember
Scheduled repayments of FHLB advances [Abstract]    
Total 90,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_LongtermDebtTypeAxis
= mcbc_SingleMaturityFixedRateAdvancesMember
80,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_LongtermDebtTypeAxis
= mcbc_SingleMaturityFixedRateAdvancesMember
Amortizable Mortgage Advances [Member]    
Advances from Federal Home Loan Bank [Abstract]    
Advance amount 6,836,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_LongtermDebtTypeAxis
= mcbc_AmortizableMortgageAdvancesMember
8,107,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_LongtermDebtTypeAxis
= mcbc_AmortizableMortgageAdvancesMember
Range of maturities, earliest 2018 2018
Range of maturities, last 2018 2018
Weighted average interest rate (in hundredths) 3.76%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mcbc_AmortizableMortgageAdvancesMember
3.78%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= mcbc_AmortizableMortgageAdvancesMember
Scheduled repayments of FHLB advances [Abstract]    
Total $ 6,836,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_LongtermDebtTypeAxis
= mcbc_AmortizableMortgageAdvancesMember
$ 8,107,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_LongtermDebtTypeAxis
= mcbc_AmortizableMortgageAdvancesMember