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Loans And The Allowance For Credit Losses (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
contract
Financing Receivable, Recorded Investment [Line Items]    
Loans $ 1,182,334,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 1,166,233,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Net deferred loan origination fees 734,000us-gaap_AmortizationOfDeferredLoanOriginationFeesNet 618,000us-gaap_AmortizationOfDeferredLoanOriginationFeesNet
Overdrawn deposit balances classified as loan balances 235,000us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1 895,000us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1
Past due loans 933,000us-gaap_FinancingReceivableRecordedInvestmentPastDue 916,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
91 Days or More Past Due 470,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue 542,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
Nonaccruing TDR's 63,000mbvt_NonaccruingTroubledDebtRestructuring 235,000mbvt_NonaccruingTroubledDebtRestructuring
Number of loans   0us-gaap_FinancingReceivableModificationsNumberOfContracts2
Troubled debt restructured loans ("TDRs") 193,000us-gaap_FinancingReceivableModificationsRecordedInvestment 406,000us-gaap_FinancingReceivableModificationsRecordedInvestment
Commitments to lend additional funds to borrowers 0us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend  
Exposure threshold for loans subject to formal review 1,000,000mbvt_ThresholdForLoansSubjectToFormalReview  
Real Estate Loans – Residential [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 469,529,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
489,706,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
Real Estate Loans – Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 412,447,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
371,319,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Residential And Commerical Loans Serviced For Others [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans 13,530,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mbvt_ResidentialAndCommericalLoansServicedForOthersMember
13,830,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mbvt_ResidentialAndCommericalLoansServicedForOthersMember
Performing Financing Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Past due loans 414,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
0us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Accruing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
91 Days or More Past Due 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_InternalCreditAssessmentAxis
= mbvt_TdrLoansAccruingMember
75,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_InternalCreditAssessmentAxis
= mbvt_TdrLoansAccruingMember
Non-Accrual [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Past due loans 519,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_InternalCreditAssessmentAxis
= mbvt_TdrLoansNonAccruingMember
542,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_InternalCreditAssessmentAxis
= mbvt_TdrLoansNonAccruingMember
Commitments to lend additional funds to borrowers 0us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
/ us-gaap_InternalCreditAssessmentAxis
= mbvt_TdrLoansNonAccruingMember
 
Restructured [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Past due loans 0us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_InternalCreditAssessmentAxis
= mbvt_RestructuredMember
42,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_InternalCreditAssessmentAxis
= mbvt_RestructuredMember
Restructured [Member] | Real Estate Loans – Residential [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Number of loans 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= mbvt_RestructuredMember
 
Troubled debt restructured loans ("TDRs") 55,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= mbvt_RestructuredMember
 
Restructured [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Number of loans 4us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= mbvt_RestructuredMember
 
Troubled debt restructured loans ("TDRs") 147,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= mbvt_RestructuredMember
 
Restructured [Member] | Real Estate Loans – Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Number of loans 3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= mbvt_RestructuredMember
 
Troubled debt restructured loans ("TDRs") $ 46,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= mbvt_RestructuredMember