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Borrowings Federal Funds Purchased, Securities Sold Under Agreements to Repurchase and Short-term Borrowings (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Securities sold under agreements to repurchase    
Securities sold under agreements to repurchase $ 38,551us-gaap_SecuritiesSoldUnderAgreementsToRepurchase $ 34,539us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Weighted-average interest rate at year-end 0.80%mbrg_SecuritiesSoldUnderAgreementsToRepurchaseWeightedAverageInterestRateAtYearEnd 0.90%mbrg_SecuritiesSoldUnderAgreementsToRepurchaseWeightedAverageInterestRateAtYearEnd
Maximum amount outstanding at any month's end 43,989mbrg_SecuritiesSoldUnderAgreementsToRepurchaseMaximumMonthEndOutstandingAmount 41,684mbrg_SecuritiesSoldUnderAgreementsToRepurchaseMaximumMonthEndOutstandingAmount
Average amount outstanding during the year $ 37,035mbrg_SecuritiesSoldUnderAgreementsToRepurchaseAverageAmountOutstanding $ 36,227mbrg_SecuritiesSoldUnderAgreementsToRepurchaseAverageAmountOutstanding
Weighted-average interest rate during the year 0.86%mbrg_SecuritiesSoldUnderAgreementToRepurchaseWeightedAverageInterestRate 0.91%mbrg_SecuritiesSoldUnderAgreementToRepurchaseWeightedAverageInterestRate