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Commitments And Contingencies (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Expiration term of contingent obligations, months 12 months  
Standby Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contingent Obligations 5,740,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember
$ 8,770,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember
Loan Sales Commitments [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Contingent Obligations 0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= mbvt_LoanSalesCommitmentsMember
$ 0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= mbvt_LoanSalesCommitmentsMember