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Investment Securities (Summary Of Amortized Cost And Fair Values Of Securities Classified As Available For Sale And Held To Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]    
Available for Sale, Amortized Cost $ 245,471us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 201,162us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available for Sale, Gross Unrealized Gains 3,939mbvt_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments 3,034mbvt_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
Available for Sale, Gross Unrealized Losses 423mbvt_AvailableForSaleEquitySecuritiesGrossUnrealizedLossAccumulatedInInvestments 723mbvt_AvailableForSaleEquitySecuritiesGrossUnrealizedLossAccumulatedInInvestments
Available for Sale, Fair Value 248,987us-gaap_AvailableForSaleSecurities 203,473us-gaap_AvailableForSaleSecurities
Held to Maturity, Amortized Cost 134,245us-gaap_HeldToMaturitySecurities 138,421us-gaap_HeldToMaturitySecurities
Held to Maturity, Gross Unrealized Gains 2,107mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain 1,269mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
Held to Maturity, Gross Unrealized Losses 115mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss 519mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Held-to-maturity Securities, Fair Value 136,237us-gaap_HeldToMaturitySecuritiesFairValue 139,171us-gaap_HeldToMaturitySecuritiesFairValue
U.S. Treasury Obligations [Member]    
Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]    
Available for Sale, Amortized Cost 25,051us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
25,048us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Available for Sale, Gross Unrealized Gains 271mbvt_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
57mbvt_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Available for Sale, Gross Unrealized Losses   12mbvt_AvailableForSaleEquitySecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Available for Sale, Fair Value 25,322us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
25,093us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
U.S. Agency Obligations [Member]    
Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]    
Held to Maturity, Amortized Cost 21,387us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
22,072us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Held to Maturity, Gross Unrealized Gains 672mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
597mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Held-to-maturity Securities, Fair Value 22,059us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
22,669us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
U.S. GSEs [Member]    
Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]    
Held to Maturity, Amortized Cost 9,512us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
9,498us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Held to Maturity, Gross Unrealized Gains 195mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
59mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Held-to-maturity Securities, Fair Value 9,707us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
9,557us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
FHLB Obligations [Member]    
Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]    
Available for Sale, Amortized Cost 10,119us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
 
Available for Sale, Gross Unrealized Gains 19mbvt_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
 
Available for Sale, Gross Unrealized Losses 4mbvt_AvailableForSaleEquitySecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
 
Available for Sale, Fair Value 10,134us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
 
Held to Maturity, Amortized Cost 4,730us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
4,720us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
Held to Maturity, Gross Unrealized Gains 176mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
100mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
Held-to-maturity Securities, Fair Value 4,906us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
4,820us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
Agency MBSs [Member]    
Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]    
Available for Sale, Amortized Cost 113,454us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
92,827us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available for Sale, Gross Unrealized Gains 2,977mbvt_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
2,680mbvt_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available for Sale, Gross Unrealized Losses 84mbvt_AvailableForSaleEquitySecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
100mbvt_AvailableForSaleEquitySecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available for Sale, Fair Value 116,347us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
95,407us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held to Maturity, Amortized Cost 7,856us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
8,109us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held to Maturity, Gross Unrealized Gains 247mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
233mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held-to-maturity Securities, Fair Value 8,103us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
8,342us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Agency CMBSs [Member]    
Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]    
Available for Sale, Amortized Cost 25,080us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
22,056us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Available for Sale, Gross Unrealized Gains 19mbvt_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
20mbvt_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Available for Sale, Gross Unrealized Losses 243mbvt_AvailableForSaleEquitySecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
372mbvt_AvailableForSaleEquitySecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Available for Sale, Fair Value 24,856us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
21,704us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Agency CMOs [Member]    
Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]    
Available for Sale, Amortized Cost 71,423us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
60,880us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
Available for Sale, Gross Unrealized Gains 613mbvt_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
241mbvt_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
Available for Sale, Gross Unrealized Losses 92mbvt_AvailableForSaleEquitySecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
239mbvt_AvailableForSaleEquitySecuritiesGrossUnrealizedLossAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
Available for Sale, Fair Value 71,944us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
60,882us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
Held to Maturity, Amortized Cost 90,760us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
94,022us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
Held to Maturity, Gross Unrealized Gains 817mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
280mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
Held to Maturity, Gross Unrealized Losses 115mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
519mbvt_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
Held-to-maturity Securities, Fair Value 91,462us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
93,783us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
ABSs [Member]    
Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]    
Available for Sale, Amortized Cost 344us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
351us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available for Sale, Gross Unrealized Gains 40mbvt_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
36mbvt_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available for Sale, Fair Value $ 384us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
$ 387us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember