XML 23 R78.htm IDEA: XBRL DOCUMENT v2.4.1.9
Employee Benefit Plans (Reconciliation of Changes in Plan's Benefit Obligations and Fair Value of Assets) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Employee Benefit Plans [Abstract]      
Benefit obligation at beginning of year $ 9,611us-gaap_DefinedBenefitPlanBenefitObligation $ 10,801us-gaap_DefinedBenefitPlanBenefitObligation  
Service cost including expenses 44us-gaap_DefinedBenefitPlanServiceCost 53us-gaap_DefinedBenefitPlanServiceCost 48us-gaap_DefinedBenefitPlanServiceCost
Interest cost 464us-gaap_DefinedBenefitPlanInterestCost 418us-gaap_DefinedBenefitPlanInterestCost 478us-gaap_DefinedBenefitPlanInterestCost
Actuarial (gain) loss 2,013us-gaap_DefinedBenefitPlanActuarialGainLoss (1,117)us-gaap_DefinedBenefitPlanActuarialGainLoss  
Benefits paid and expected expenses (576)us-gaap_DefinedBenefitPlanBenefitsPaid (544)us-gaap_DefinedBenefitPlanBenefitsPaid  
Benefit obligation at year-end 11,556us-gaap_DefinedBenefitPlanBenefitObligation 9,611us-gaap_DefinedBenefitPlanBenefitObligation 10,801us-gaap_DefinedBenefitPlanBenefitObligation
Fair value of plan assets at beginning of year 15,446us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 14,412us-gaap_DefinedBenefitPlanFairValueOfPlanAssets  
Actual return on plan assets 489us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets 1,569us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets  
Employer contributions 0us-gaap_DefinedBenefitPlanContributionsByEmployer 0us-gaap_DefinedBenefitPlanContributionsByEmployer  
Benefits paid and actual expenses (585)mbvt_DefinedBenefitPlanFairValueOfPlanAssetsBenefitsPaid (535)mbvt_DefinedBenefitPlanFairValueOfPlanAssetsBenefitsPaid  
Fair value of plan assets at year-end 15,350us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 15,446us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 14,412us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Funded status of plan at year end $ 3,794us-gaap_DefinedBenefitPlanFundedStatusOfPlan $ 5,835us-gaap_DefinedBenefitPlanFundedStatusOfPlan