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Subsequent Events (Details) (Subsequent Event [Member], NUVO Bank & Trust Company [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended
Apr. 27, 2015
Subsequent Event [Member] | NUVO Bank & Trust Company [Member]
  
Subsequent Event [Line Items]  
Business Combination, Consideration Transferred $ 21.8us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= mbvt_NuvoBankTrustCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Business Acquisition, Share Price $ 7.15us-gaap_BusinessAcquisitionSharePrice
/ us-gaap_BusinessAcquisitionAxis
= mbvt_NuvoBankTrustCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Business Acquisition, Stock Conversion Ratio 0.2416mbvt_BusinessAcquisitionStockConversionRatio
/ us-gaap_BusinessAcquisitionAxis
= mbvt_NuvoBankTrustCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Business Acquisition, Percentage Of Total Consideration Comprised Of Stock 75.00%mbvt_BusinessAcquisitionPercentageOfTotalConsiderationComprisedOfStock
/ us-gaap_BusinessAcquisitionAxis
= mbvt_NuvoBankTrustCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Business Acquisition, Percentage Of Total Consideration Comprised Of Cash 25.00%mbvt_BusinessAcquisitionPercentageOfTotalConsiderationComprisedOfCash
/ us-gaap_BusinessAcquisitionAxis
= mbvt_NuvoBankTrustCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Percentage Of Tangible Book Value 133.00%mbvt_PercentageOfTangibleBookValue
/ us-gaap_BusinessAcquisitionAxis
= mbvt_NuvoBankTrustCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Factor Of Earnings 51.9mbvt_FactorOfEarnings
/ us-gaap_BusinessAcquisitionAxis
= mbvt_NuvoBankTrustCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember