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Derivatives Derivatives designated as cash flow hedges narrative (Details) (USD $)
0 Months Ended 12 Months Ended
Oct. 23, 2010
Dec. 31, 2010
Dec. 31, 2014
Dec. 31, 2013
Nov. 25, 2013
Derivative [Line Items]          
Notional Amount     $ 11,498,000invest_DerivativeNotionalAmount $ 8,470,000invest_DerivativeNotionalAmount  
Hedging Instrument [Member]          
Derivative [Line Items]          
Pay Rate   2.59%mbrg_DerivativeFixedInterestRatePayRate
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
     
Notional Amount   5,200,000invest_DerivativeNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
     
Term 10 years 5 years      
Hedging Instrument [Member] | Pay fixed - receive floating interest rate swap [Member]          
Derivative [Line Items]          
Amounts included in accumulated other comprehensive income as unrealized losses     185,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
29,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Hedging Instrument [Member] | Interest Rate Swap 2 [Member]          
Derivative [Line Items]          
Pay Rate         1.43%mbrg_DerivativeFixedInterestRatePayRate
/ us-gaap_DerivativeByNatureAxis
= mbrg_InterestRateSwap2Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Notional Amount         10,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= mbrg_InterestRateSwap2Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Operating Expense [Member] | Hedging Instrument [Member]          
Derivative [Line Items]          
Loss on Cash Flow Hedge Ineffectiveness     $ 6,000us-gaap_LossOnCashFlowHedgeIneffectiveness
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember