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Note 8 - Deposits (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Disclosure Text Block [Abstract]    
Time Deposit Maturities, Remainder of Fiscal Year $ 100.1us-gaap_TimeDepositMaturitiesRemainderOfFiscalYear  
Time Deposit Maturities, Year Two 31.8us-gaap_TimeDepositMaturitiesYearTwo  
Time Deposit Maturities, Year Three 13.0us-gaap_TimeDepositMaturitiesYearThree  
Time Deposit Maturities, Year Four 13.5us-gaap_TimeDepositMaturitiesYearFour  
Time Deposit Maturities, Year Five 11.5us-gaap_TimeDepositMaturitiesYearFive  
Time Deposits, $250,000 or More $ 54.6mbcn_TimeDeposits250000OrMore $ 18.0mbcn_TimeDeposits250000OrMore