Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)

v2.4.1.9
CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Issuance of Common Stock on exercise of stock purchase warrants (in shares) 392mcbc_StockIssuedDuringPeriodSharesWarrantsExercised  
Cash dividend (in dollars per share) $ 0.08us-gaap_CommonStockDividendsPerShareDeclared $ 0us-gaap_CommonStockDividendsPerShareDeclared
Series A [Member]    
Number of shares converted in conversion of Preferred Stock to Common Stock (in shares) 5,973,519us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember 		 
Series B [Member]    
Number of shares exchanged in exchange of Preferred Stock to Common Stock (in shares) 457,519mcbc_ExchangeOfStockSharesExchanged
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember 		 
Common Stock [Member]    
Number of shares repurchased for taxes withheld on vested restricted stock (in shares) 20,534mcbc_NumberOfSharesRepurchasedForTaxesWithheldOnVestedRestrictedStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		8,906mcbc_NumberOfSharesRepurchasedForTaxesWithheldOnVestedRestrictedStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Conversion of Preferred Stock Series B to Common Stock [Member] | Common Stock [Member]    
Number of shares issued in conversion of Preferred Stock to Common Stock (in shares)   50,000us-gaap_ConversionOfStockSharesIssued1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= mcbc_ConversionOfPreferredStockSeriesBToCommonStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Conversion of Preferred Stock Series B to Common Stock [Member] | Preferred Stock [Member] | Series B [Member]    
Number of shares converted in conversion of Preferred Stock to Common Stock (in shares)   300us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= mcbc_ConversionOfPreferredStockSeriesBToCommonStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
Exchange of Preferred Stock Series A to Common Stock [Member] | Common Stock [Member]    
Number of shares issued in exchange of Preferred Stock to Common Stock (in shares)   5,973,519mcbc_ExchangeOfStockSharesIssued
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= mcbc_ExchangeOfPreferredStockSeriesAToCommonStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Exchange of Preferred Stock Series A to Common Stock [Member] | Preferred Stock [Member] | Series A [Member]    
Number of shares exchanged in exchange of Preferred Stock to Common Stock (in shares)   31,290mcbc_ExchangeOfStockSharesExchanged
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= mcbc_ExchangeOfPreferredStockSeriesAToCommonStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
Exchange of Preferred Stock Series B to Common Stock [Member] | Common Stock [Member]    
Number of shares issued in exchange of Preferred Stock to Common Stock (in shares)   457,159mcbc_ExchangeOfStockSharesIssued
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= mcbc_ExchangeOfPreferredStockSeriesBToCommonStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Exchange of Preferred Stock Series B to Common Stock [Member] | Preferred Stock [Member] | Series B [Member]    
Number of shares exchanged in exchange of Preferred Stock to Common Stock (in shares)   2,300mcbc_ExchangeOfStockSharesExchanged
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= mcbc_ExchangeOfPreferredStockSeriesBToCommonStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember