XML 30 R73.htm IDEA: XBRL DOCUMENT v2.4.1.9
Loans, Net Troubled Debt Restructurings Narrative (Details) (USD $)
0 Months Ended 12 Months Ended
Dec. 31, 2014
loan
Dec. 31, 2014
loan
Dec. 31, 2013
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total TDR $ 6,900,000us-gaap_FinancingReceivableModificationsRecordedInvestment $ 6,900,000us-gaap_FinancingReceivableModificationsRecordedInvestment $ 15,600,000us-gaap_FinancingReceivableModificationsRecordedInvestment
TDR included in nonaccrual loans 2,600,000mbrg_TdrIncludedInNonaccrualLoans 2,600,000mbrg_TdrIncludedInNonaccrualLoans  
TDR performing as agreed 4,300,000mbrg_TdrPerformingAsAgreed 4,300,000mbrg_TdrPerformingAsAgreed  
Valuation Allowance related to total TDR 517,000us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment 517,000us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment 2,800,000us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment
Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2 5us-gaap_FinancingReceivableModificationsNumberOfContracts2 23us-gaap_FinancingReceivableModificationsNumberOfContracts2
Number of loans for extended terms     18mbrg_NumberOfLoansForExtendedTerms
Number of loans for lowering interest     18mbrg_NumberOfLoansForLoweringInterest
Number of loans on interest only payments methods     12mbrg_NumberOfLoansOnInterestOnlyPaymentsMethods
Number of loans for which allowance for loan losses measured under general allowance methodology   2mbrg_NumberOfLoansForWhichAllowanceForLoanLossesMeasuredUnderGeneralAllowanceMethodology 13mbrg_NumberOfLoansForWhichAllowanceForLoanLossesMeasuredUnderGeneralAllowanceMethodology
Recorded investment as TDR for which allowance for loan losses measured under general allowance methodology   916,000mbrg_RecordedInvestmentAsTdrForWhichAllowanceForLoanLossesMeasuredUnderGeneralAllowanceMethodology 3,500,000mbrg_RecordedInvestmentAsTdrForWhichAllowanceForLoanLossesMeasuredUnderGeneralAllowanceMethodology
Allowance for loan losses on recorded investment as TDR 0mbrg_AllowanceForLoanLossesOnRecordedInvestmentAsTdr 0mbrg_AllowanceForLoanLossesOnRecordedInvestmentAsTdr 1,300,000mbrg_AllowanceForLoanLossesOnRecordedInvestmentAsTdr
TDR subsequently defaulted   44,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 132,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Financing receivable, modifications, number of contracts sold   2mbrg_Financingreceivablemodificationsnumberofcontractssold  
Financing receivable, modifications, number of contracts paid off   2mbrg_Financingreceivablemodificationsnumberofcontractspaidoff  
Real Estate Loans Secured by 1 - 4 Family Residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Contracts   4us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
12us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
TDR subsequently defaulted   0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Mortgage Loans on Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Proceeds from Sale of Finance Receivables   $ 907,000us-gaap_ProceedsFromSaleOfFinanceReceivables
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_MortgageLoansOnRealEstateMember