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Employee Benefit Plans (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Employee Benefit Plans [Abstract]    
Interest cost $ 112,000us-gaap_DefinedBenefitPlanInterestCost $ 116,000us-gaap_DefinedBenefitPlanInterestCost
Expected return on plan assets (264,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (265,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Service costs 13,000us-gaap_DefinedBenefitPlanServiceCost 10,000us-gaap_DefinedBenefitPlanServiceCost
Net loss amortization 103,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 32,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Net periodic pension cost (36,000)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost (107,000)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Minimum required contribution for 2015 $ 0mbvt_DefinedBenefitPlansMinimumRequiredContributionInCurrentFiscalYear