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Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Consolidated Statements Of Comprehensive Income [Abstract]    
Unrealized holding gain (loss) on securities available for sale, net of tax $ 422us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent $ 422us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent
Unrealized holding gain arising during the period for securities transferred from available for sale to held to maturity, net of tax 0mbvt_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleSecuritiesTransferredToHeldToMaturityTax 4mbvt_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleSecuritiesTransferredToHeldToMaturityTax
Amortization of unrealized holding losses of securities transferred from available for sale to held to maturity, net of taxes 67mbvt_AccretionOfOtherComprehensiveIncomeLossTransfersFromAvailableForSaleSecuritiesToHeldToMaturityTax 61mbvt_AccretionOfOtherComprehensiveIncomeLossTransfersFromAvailableForSaleSecuritiesToHeldToMaturityTax
Reclassification adjustments for net securities gains included in net income, net of tax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax (44)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Change in net unrealized loss on interest rate swaps, net of tax 11us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax 22us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
Pension liability adjustment, net of tax $ 36us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax $ 11us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax