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Deposits (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Banking and Thrift [Abstract]    
Interest bearing product for overnight funding $ 42,200,000mbrg_InterestBearingProductForOvernightFunding $ 42,100,000mbrg_InterestBearingProductForOvernightFunding
Time deposits of $100,000 or more 81,500,000us-gaap_TimeDeposits100000OrMore 80,500,000us-gaap_TimeDeposits100000OrMore
Scheduled maturities of time deposits [Abstract]    
2015 114,838,000us-gaap_TimeDepositMaturitiesYearOne  
2016 79,841,000us-gaap_TimeDepositMaturitiesYearTwo  
2017 48,722,000us-gaap_TimeDepositMaturitiesYearThree  
2018 2,374,000us-gaap_TimeDepositMaturitiesYearFour  
2019 3,163,000us-gaap_TimeDepositMaturitiesYearFive  
Total 248,938,000us-gaap_TimeDeposits 267,940,000us-gaap_TimeDeposits
Overdraft demand deposits reclassified to loans 148,000us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1 133,000us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1
Brokered deposits $ 48,700,000us-gaap_InterestBearingDomesticDepositBrokered $ 61,000,000us-gaap_InterestBearingDomesticDepositBrokered