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Premises and Equipment (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2008
Property, Plant and Equipment [Line Items]        
Depreciation and amortization expense $ 2,450,000us-gaap_DepreciationAndAmortization $ 2,180,000us-gaap_DepreciationAndAmortization $ 1,950,000us-gaap_DepreciationAndAmortization  
Rent expense 1,320,000us-gaap_OperatingLeasesRentExpenseNet 1,200,000us-gaap_OperatingLeasesRentExpenseNet 1,080,000us-gaap_OperatingLeasesRentExpenseNet  
Principal Office in South Burlington, VT [Member]        
Property, Plant and Equipment [Line Items]        
Deferred gain included in other liabilities 1,481,000us-gaap_DeferredGainOnSaleOfProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= mbvt_PrincipalOfficeInSouthBurlingtonVermontMember
1,904,000us-gaap_DeferredGainOnSaleOfProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= mbvt_PrincipalOfficeInSouthBurlingtonVermontMember
   
Branch Location in Burlington, VT [Member]        
Property, Plant and Equipment [Line Items]        
Deferred gain included in other liabilities 841,000us-gaap_DeferredGainOnSaleOfProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= mbvt_BranchLocationInBurlingtonVermontMember
934,000us-gaap_DeferredGainOnSaleOfProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= mbvt_BranchLocationInBurlingtonVermontMember
   
Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Lease agreements expiring 20 years      
Per Year Through 2017 [Member] | Principal Office in South Burlington, VT [Member]        
Property, Plant and Equipment [Line Items]        
Deferred gains on sale leaseback transaction       423,000us-gaap_SaleLeasebackTransactionDeferredGainNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= mbvt_PrincipalOfficeInSouthBurlingtonVermontMember
/ us-gaap_RangeAxis
= mbvt_PerYearThroughTwoThousandSeventeenMember
2018 [Member] | Principal Office in South Burlington, VT [Member]        
Property, Plant and Equipment [Line Items]        
Deferred gains on sale leaseback transaction       212,000us-gaap_SaleLeasebackTransactionDeferredGainNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= mbvt_PrincipalOfficeInSouthBurlingtonVermontMember
/ us-gaap_RangeAxis
= mbvt_TwoThousandEighteenMember
Per Year Through 2023 [Member] | Branch Location in Burlington, VT [Member]        
Property, Plant and Equipment [Line Items]        
Deferred gains on sale leaseback transaction   $ 93,000us-gaap_SaleLeasebackTransactionDeferredGainNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= mbvt_BranchLocationInBurlingtonVermontMember
/ us-gaap_RangeAxis
= mbvt_PerYearThroughTwoThousandTwentyThreeMember