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Summary of Significant Accounting Policies (Details) (USD $)
12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Significant Accounting Policies [Line Items]    
Number of locations 32mbvt_NumberOfLocations  
Required percentage of aggregate principal amount of unpaid residential mortgage loans 0.35%mbvt_FederalHomeLoanBankMemberInstitutionRequiredCapitalStockHoldingsPrincipalAmountPercentageOfUnpaidResidentialMortgageLoans  
Additional allowance for loan losses $ 1,230,000us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet $ 1,550,000us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
Percentage of loans originated in amounts of the appraised value of the property 80.00%mbvt_PercentageOfLoansOriginatedInAmountsOfAppraisedValueOfProperty  
Mortgage title insurance requirement threshold for second mortgages 100,000mbvt_MortgageTitleInsuranceRequirementThresholdForSecondMortgages  
ASU adoption, net effect to net income 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome  
Unfunded commitments $ 3,019,280us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments  
Shares authorized for issuance under the Plan 600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized  
Service period 3 years  
Regional Federal Home Loan Banks [Member]    
Significant Accounting Policies [Line Items]    
Number of locations 12mbvt_NumberOfLocations
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= mbvt_RegionalFederalHomeLoanBanksMember
 
Minimum [Member]    
Significant Accounting Policies [Line Items]    
Investments in real estate limited partnerships, percentage 5.36%mbvt_InvestmentsInRealEstateLimitedPartnershipsPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum [Member]    
Significant Accounting Policies [Line Items]    
Investments in real estate limited partnerships, percentage 99.90%mbvt_InvestmentsInRealEstateLimitedPartnershipsPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember