2.4.0.8 Html 596 548 1 true 113 0 false 7 false false R1.htm 00090 - Document - Document And Entity Information Sheet http://www.mbvt.com/role/DocumentDocumentAndEntityInformation Document And Entity Information true false R2.htm 00100 - Statement - Consolidated Balance Sheets Sheet http://www.mbvt.com/role/StatementConsolidatedBalanceSheets Consolidated Balance Sheets false false R3.htm 00105 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.mbvt.com/role/StatementConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) false false R4.htm 00200 - Statement - Consolidated Statements Of Income Sheet http://www.mbvt.com/role/StatementConsolidatedStatementsOfIncome Consolidated Statements Of Income false false R5.htm 00300 - Statement - Consolidated Statements Of Comprehensive Income Sheet http://www.mbvt.com/role/StatementConsolidatedStatementsOfComprehensiveIncome Consolidated Statements Of Comprehensive Income false false R6.htm 00305 - Statement - Consolidated Statements Of Comprehensive Income (Parenthetical) Sheet http://www.mbvt.com/role/StatementConsolidatedStatementsOfComprehensiveIncomeParenthetical Consolidated Statements Of Comprehensive Income (Parenthetical) false false R7.htm 00400 - Statement - Consolidated Statements Of Changes In Shareholders' Equity Sheet http://www.mbvt.com/role/StatementConsolidatedStatementsOfChangesInShareholdersEquity Consolidated Statements Of Changes In Shareholders' Equity false false R8.htm 00405 - Statement - Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) Sheet http://www.mbvt.com/role/StatementConsolidatedStatementsOfChangesInShareholdersEquityParenthetical Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) false false R9.htm 00500 - Statement - Consolidated Statements Of Cash Flows Sheet http://www.mbvt.com/role/StatementConsolidatedStatementsOfCashFlows Consolidated Statements Of Cash Flows false false R10.htm 10101 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.mbvt.com/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies false false R11.htm 10201 - Disclosure - Recent Accounting Pronouncements Sheet http://www.mbvt.com/role/DisclosureRecentAccountingPronouncements Recent Accounting Pronouncements false false R12.htm 10301 - Disclosure - Investment Securities Sheet http://www.mbvt.com/role/DisclosureInvestmentSecurities Investment Securities false false R13.htm 10401 - Disclosure - Loans And The Allowance For Credit Losses Sheet http://www.mbvt.com/role/DisclosureLoansAndAllowanceForCreditLosses Loans And The Allowance For Credit Losses false false R14.htm 10501 - Disclosure - Fair Value Of Financial Instruments Sheet http://www.mbvt.com/role/DisclosureFairValueOfFinancialInstruments Fair Value Of Financial Instruments false false R15.htm 10601 - Disclosure - Premises and Equipment Sheet http://www.mbvt.com/role/DisclosurePremisesAndEquipment Premises and Equipment false false R16.htm 10701 - Disclosure - Time Deposits Sheet http://www.mbvt.com/role/DisclosureTimeDeposits Time Deposits false false R17.htm 10801 - Disclosure - Securities Sold Under Agreements to Repurchase and Other Short-Term Debt Sheet http://www.mbvt.com/role/DisclosureSecuritiesSoldUnderAgreementsToRepurchaseAndOtherShortTermDebt Securities Sold Under Agreements to Repurchase and Other Short-Term Debt false false R18.htm 10901 - Disclosure - Long-Term Debt Sheet http://www.mbvt.com/role/DisclosureLongTermDebt Long-Term Debt false false R19.htm 11001 - Disclosure - Trust Preferred Securities Sheet http://www.mbvt.com/role/DisclosureTrustPreferredSecurities Trust Preferred Securities false false R20.htm 11101 - Disclosure - Income Taxes Sheet http://www.mbvt.com/role/DisclosureIncomeTaxes Income Taxes false false R21.htm 11201 - Disclosure - Employee Benefit Plans Sheet http://www.mbvt.com/role/DisclosureEmployeeBenefitPlans Employee Benefit Plans false false R22.htm 11301 - Disclosure - Stock-Based Compensation Plans Sheet http://www.mbvt.com/role/DisclosureStockBasedCompensationPlans Stock-Based Compensation Plans false false R23.htm 11401 - Disclosure - Earnings Per Share Sheet http://www.mbvt.com/role/DisclosureEarningsPerShare Earnings Per Share false false R24.htm 11501 - Disclosure - Parent Company Sheet http://www.mbvt.com/role/DisclosureParentCompany Parent Company false false R25.htm 11601 - Disclosure - Commitments And Contingencies Sheet http://www.mbvt.com/role/DisclosureCommitmentsAndContingencies Commitments And Contingencies false false R26.htm 11701 - Disclosure - Accumulated Other Comprehensive Income (Loss) Sheet http://www.mbvt.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLoss Accumulated Other Comprehensive Income (Loss) false false R27.htm 11801 - Disclosure - Regulatory Capital Requirements Sheet http://www.mbvt.com/role/DisclosureRegulatoryCapitalRequirements Regulatory Capital Requirements false false R28.htm 11901 - Disclosure - Derivative Financial Instruments Sheet http://www.mbvt.com/role/DisclosureDerivativeFinancialInstruments Derivative Financial Instruments false false R29.htm 20102 - Disclosure - Summary of Significant Accounting Policies (Policy) Sheet http://www.mbvt.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicy Summary of Significant Accounting Policies (Policy) false false R30.htm 30303 - Disclosure - Investment Securities (Tables) Sheet http://www.mbvt.com/role/DisclosureInvestmentSecuritiesTables Investment Securities (Tables) false false R31.htm 30403 - Disclosure - Loans And The Allowance For Credit Losses (Tables) Sheet http://www.mbvt.com/role/DisclosureLoansAndAllowanceForCreditLossesTables Loans And The Allowance For Credit Losses (Tables) false false R32.htm 30503 - Disclosure - Fair Value Of Financial Instruments (Tables) Sheet http://www.mbvt.com/role/DisclosureFairValueOfFinancialInstrumentsTables Fair Value Of Financial Instruments (Tables) false false R33.htm 30603 - Disclosure - Premises and Equipment (Tables) Sheet http://www.mbvt.com/role/DisclosurePremisesAndEquipmentTables Premises and Equipment (Tables) false false R34.htm 30703 - Disclosure - Time Deposits (Tables) Sheet http://www.mbvt.com/role/DisclosureTimeDepositsTables Time Deposits (Tables) false false R35.htm 30803 - Disclosure - Securities Sold Under Agreements to Repurchase and Other Short-Term Debt (Tables) Sheet http://www.mbvt.com/role/DisclosureSecuritiesSoldUnderAgreementsToRepurchaseAndOtherShortTermDebtTables Securities Sold Under Agreements to Repurchase and Other Short-Term Debt (Tables) false false R36.htm 30903 - Disclosure - Long-Term Debt (Tables) Sheet http://www.mbvt.com/role/DisclosureLongTermDebtTables Long-Term Debt (Tables) false false R37.htm 31103 - Disclosure - Income Taxes (Tables) Sheet http://www.mbvt.com/role/DisclosureIncomeTaxesTables Income Taxes (Tables) false false R38.htm 31203 - Disclosure - Employee Benefit Plans (Tables) Sheet http://www.mbvt.com/role/DisclosureEmployeeBenefitPlansTables Employee Benefit Plans (Tables) false false R39.htm 31303 - Disclosure - Stock-Based Compensation Plans (Tables) Sheet http://www.mbvt.com/role/DisclosureStockBasedCompensationPlansTables Stock-Based Compensation Plans (Tables) false false R40.htm 31403 - Disclosure - Earnings Per Share (Tables) Sheet http://www.mbvt.com/role/DisclosureEarningsPerShareTables Earnings Per Share (Tables) false false R41.htm 31503 - Disclosure - Parent Company (Tables) Sheet http://www.mbvt.com/role/DisclosureParentCompanyTables Parent Company (Tables) false false R42.htm 31603 - Disclosure - Commitments And Contingencies (Tables) Sheet http://www.mbvt.com/role/DisclosureCommitmentsAndContingenciesTables Commitments And Contingencies (Tables) false false R43.htm 31703 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables) Sheet http://www.mbvt.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossTables Accumulated Other Comprehensive Income (Loss) (Tables) false false R44.htm 31803 - Disclosure - Regulatory Capital Requirements (Tables) Sheet http://www.mbvt.com/role/DisclosureRegulatoryCapitalRequirementsTables Regulatory Capital Requirements (Tables) false false R45.htm 40101 - Disclosure - Summary of Significant Accounting Policies (Details) Sheet http://www.mbvt.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails Summary of Significant Accounting Policies (Details) false false R46.htm 40301 - Disclosure - Investment Securities (Narrative) (Details) Sheet http://www.mbvt.com/role/DisclosureInvestmentSecuritiesNarrativeDetails Investment Securities (Narrative) (Details) false false R47.htm 40302 - Disclosure - Investment Securities (Summary Of Amortized Cost And Fair Values Of Securities Classified As Available For Sale And Held To Maturity) (Details) Sheet http://www.mbvt.com/role/DisclosureInvestmentSecuritiesSummaryOfAmortizedCostAndFairValuesOfSecuritiesClassifiedAsAvailableForSaleAndHeldToMaturityDetails Investment Securities (Summary Of Amortized Cost And Fair Values Of Securities Classified As Available For Sale And Held To Maturity) (Details) false false R48.htm 40303 - Disclosure - Investment Securities (Summary Of Contractual Maturity Of Debt Securities Classified As Available For Sale And Held To Maturity) (Details) Sheet http://www.mbvt.com/role/DisclosureInvestmentSecuritiesSummaryOfContractualMaturityOfDebtSecuritiesClassifiedAsAvailableForSaleAndHeldToMaturityDetails Investment Securities (Summary Of Contractual Maturity Of Debt Securities Classified As Available For Sale And Held To Maturity) (Details) false false R49.htm 40304 - Disclosure - Investment Securities (Summary Of Proceeds, Gross Gains and Gross Losses On Available For Sale Securities) (Details) Sheet http://www.mbvt.com/role/DisclosureInvestmentSecuritiesSummaryOfProceedsGrossGainsAndGrossLossesOnAvailableForSaleSecuritiesDetails Investment Securities (Summary Of Proceeds, Gross Gains and Gross Losses On Available For Sale Securities) (Details) false false R50.htm 40305 - Disclosure - Investment Securities (Summary Of Gross Unrealized Or Unrecognized Losses On Investment Securities And Length Of Time) (Details) Sheet http://www.mbvt.com/role/DisclosureInvestmentSecuritiesSummaryOfGrossUnrealizedOrUnrecognizedLossesOnInvestmentSecuritiesAndLengthOfTimeDetails Investment Securities (Summary Of Gross Unrealized Or Unrecognized Losses On Investment Securities And Length Of Time) (Details) false false R51.htm 40401 - Disclosure - Loans And The Allowance For Credit Losses (Narrative) (Details) Sheet http://www.mbvt.com/role/DisclosureLoansAndAllowanceForCreditLossesNarrativeDetails Loans And The Allowance For Credit Losses (Narrative) (Details) false false R52.htm 40402 - Disclosure - Loans And The Allowance For Credit Losses (Composition of Loan Portfolio) (Details) Sheet http://www.mbvt.com/role/DisclosureLoansAndAllowanceForCreditLossesCompositionOfLoanPortfolioDetails Loans And The Allowance For Credit Losses (Composition of Loan Portfolio) (Details) false false R53.htm 40403 - Disclosure - Loans And The Allowance For Credit Losses (Loan Loss Experience And Activity In The Allowance For Credit Losses) (Details) Sheet http://www.mbvt.com/role/DisclosureLoansAndAllowanceForCreditLossesLoanLossExperienceAndActivityInAllowanceForCreditLossesDetails Loans And The Allowance For Credit Losses (Loan Loss Experience And Activity In The Allowance For Credit Losses) (Details) false false R54.htm 40404 - Disclosure - Loans And The Allowance For Credit Losses (Allowance For Loan Losses And The Recorded Investment In Loans) (Details) Sheet http://www.mbvt.com/role/DisclosureLoansAndAllowanceForCreditLossesAllowanceForLoanLossesAndRecordedInvestmentInLoansDetails Loans And The Allowance For Credit Losses (Allowance For Loan Losses And The Recorded Investment In Loans) (Details) false false R55.htm 40405 - Disclosure - Loans And The Allowance For Credit Losses (Recorded Investment Of Loans, Including Nonaccrual And Restructured Loans, By Class) (Details) Sheet http://www.mbvt.com/role/DisclosureLoansAndAllowanceForCreditLossesRecordedInvestmentOfLoansIncludingNonaccrualAndRestructuredLoansByClassDetails Loans And The Allowance For Credit Losses (Recorded Investment Of Loans, Including Nonaccrual And Restructured Loans, By Class) (Details) false false R56.htm 40406 - Disclosure - Loans And The Allowance For Credit Losses (Impaired Loans By Class) (Details) Sheet http://www.mbvt.com/role/DisclosureLoansAndAllowanceForCreditLossesImpairedLoansByClassDetails Loans And The Allowance For Credit Losses (Impaired Loans By Class) (Details) false false R57.htm 40408 - Disclosure - Loans And The Allowance For Credit Losses (Nonperforming Loans) (Details) Sheet http://www.mbvt.com/role/DisclosureLoansAndAllowanceForCreditLossesNonperformingLoansDetails Loans And The Allowance For Credit Losses (Nonperforming Loans) (Details) false false R58.htm 40409 - Disclosure - Loans And The Allowance For Credit Losses (Nonaccrual Loans By Class) (Details) Sheet http://www.mbvt.com/role/DisclosureLoansAndAllowanceForCreditLossesNonaccrualLoansByClassDetails Loans And The Allowance For Credit Losses (Nonaccrual Loans By Class) (Details) false false R59.htm 40410 - Disclosure - Loans And The Allowance For Credit Losses (Summary Of Loans By Credit Quality Indicator) (Details) Sheet http://www.mbvt.com/role/DisclosureLoansAndAllowanceForCreditLossesSummaryOfLoansByCreditQualityIndicatorDetails Loans And The Allowance For Credit Losses (Summary Of Loans By Credit Quality Indicator) (Details) false false R60.htm 40501 - Disclosure - Fair Value Of Financial Instruments (Narrative) (Details) Sheet http://www.mbvt.com/role/DisclosureFairValueOfFinancialInstrumentsNarrativeDetails Fair Value Of Financial Instruments (Narrative) (Details) false false R61.htm 40502 - Disclosure - Fair Value Of Financial Instruments (Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) Sheet http://www.mbvt.com/role/DisclosureFairValueOfFinancialInstrumentsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails Fair Value Of Financial Instruments (Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) false false R62.htm 40503 - Disclosure - Fair Value Of Financial Instruments (Fair Value Of Financial Instruments) (Details) Sheet http://www.mbvt.com/role/DisclosureFairValueOfFinancialInstrumentsFairValueOfFinancialInstrumentsDetails Fair Value Of Financial Instruments (Fair Value Of Financial Instruments) (Details) false false R63.htm 40601 - Disclosure - Premises and Equipment (Narrative) (Details) Sheet http://www.mbvt.com/role/DisclosurePremisesAndEquipmentNarrativeDetails Premises and Equipment (Narrative) (Details) false false R64.htm 40602 - Disclosure - Premises and Equipment (Components Included In The Accompanying Balance Sheet) (Details) Sheet http://www.mbvt.com/role/DisclosurePremisesAndEquipmentComponentsIncludedInAccompanyingBalanceSheetDetails Premises and Equipment (Components Included In The Accompanying Balance Sheet) (Details) false false R65.htm 40603 - Disclosure - Premises and Equipment (Minimum Lease Payments) (Details) Sheet http://www.mbvt.com/role/DisclosurePremisesAndEquipmentMinimumLeasePaymentsDetails Premises and Equipment (Minimum Lease Payments) (Details) false false R66.htm 40701 - Disclosure - Time Deposits (Details) Sheet http://www.mbvt.com/role/DisclosureTimeDepositsDetails Time Deposits (Details) false false R67.htm 40801 - Disclosure - Securities Sold Under Agreements to Repurchase and Other Short-Term Debt (Narrative) (Details) Sheet http://www.mbvt.com/role/DisclosureSecuritiesSoldUnderAgreementsToRepurchaseAndOtherShortTermDebtNarrativeDetails Securities Sold Under Agreements to Repurchase and Other Short-Term Debt (Narrative) (Details) false false R68.htm 40802 - Disclosure - Securities Sold Under Agreements to Repurchase and Other Short-Term Debt (Information Regarding Other Borrowed Funds) (Details) Sheet http://www.mbvt.com/role/DisclosureSecuritiesSoldUnderAgreementsToRepurchaseAndOtherShortTermDebtInformationRegardingOtherBorrowedFundsDetails Securities Sold Under Agreements to Repurchase and Other Short-Term Debt (Information Regarding Other Borrowed Funds) (Details) false false R69.htm 40901 - Disclosure - Long-Term Debt (Narrative) (Details) Sheet http://www.mbvt.com/role/DisclosureLongTermDebtNarrativeDetails Long-Term Debt (Narrative) (Details) false false R70.htm 40902 - Disclosure - Long-Term Debt (Long-Term Debt) (Details) Sheet http://www.mbvt.com/role/DisclosureLongTermDebtLongTermDebtDetails Long-Term Debt (Long-Term Debt) (Details) false false R71.htm 40903 - Disclosure - Long-Term Debt (Contractual Maturities and Amortization of Long-Term Debt) (Details) Sheet http://www.mbvt.com/role/DisclosureLongTermDebtContractualMaturitiesAndAmortizationOfLongTermDebtDetails Long-Term Debt (Contractual Maturities and Amortization of Long-Term Debt) (Details) false false R72.htm 41001 - Disclosure - Trust Preferred Securities (Details) Sheet http://www.mbvt.com/role/DisclosureTrustPreferredSecuritiesDetails Trust Preferred Securities (Details) false false R73.htm 41101 - Disclosure - Income Taxes (Narrative) (Details) Sheet http://www.mbvt.com/role/DisclosureIncomeTaxesNarrativeDetails Income Taxes (Narrative) (Details) false false R74.htm 41102 - Disclosure - Income Taxes (Components of Provision for Income Taxes) (Details) Sheet http://www.mbvt.com/role/DisclosureIncomeTaxesComponentsOfProvisionForIncomeTaxesDetails Income Taxes (Components of Provision for Income Taxes) (Details) false false R75.htm 41103 - Disclosure - Income Taxes (Tax Effects of Temporary Differences and Tax Credits that Give Rise to Deferred Tax Assets and Liabilities) (Details) Sheet http://www.mbvt.com/role/DisclosureIncomeTaxesTaxEffectsOfTemporaryDifferencesAndTaxCreditsThatGiveRiseToDeferredTaxAssetsAndLiabilitiesDetails Income Taxes (Tax Effects of Temporary Differences and Tax Credits that Give Rise to Deferred Tax Assets and Liabilities) (Details) false false R76.htm 41104 - Disclosure - Income Taxes (Reconciliation of Federal Income Tax Provision) (Details) Sheet http://www.mbvt.com/role/DisclosureIncomeTaxesReconciliationOfFederalIncomeTaxProvisionDetails Income Taxes (Reconciliation of Federal Income Tax Provision) (Details) false false R77.htm 41201 - Disclosure - Employee Benefit Plans (Narrative) (Details) Sheet http://www.mbvt.com/role/DisclosureEmployeeBenefitPlansNarrativeDetails Employee Benefit Plans (Narrative) (Details) false false R78.htm 41202 - Disclosure - Employee Benefit Plans (Reconciliation of Changes in Plan's Benefit Obligations and Fair Value of Assets) (Details) Sheet http://www.mbvt.com/role/DisclosureEmployeeBenefitPlansReconciliationOfChangesInPlanSBenefitObligationsAndFairValueOfAssetsDetails Employee Benefit Plans (Reconciliation of Changes in Plan's Benefit Obligations and Fair Value of Assets) (Details) false false R79.htm 41203 - Disclosure - Employee Benefit Plans (Net Periodic Benefit Costs) (Details) Sheet http://www.mbvt.com/role/DisclosureEmployeeBenefitPlansNetPeriodicBenefitCostsDetails Employee Benefit Plans (Net Periodic Benefit Costs) (Details) false false R80.htm 41204 - Disclosure - Employee Benefit Plans (Summary of Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Costs) (Details) Sheet http://www.mbvt.com/role/DisclosureEmployeeBenefitPlansSummaryOfAssumptionsUsedToDetermineBenefitObligationsAndNetPeriodicBenefitCostsDetails Employee Benefit Plans (Summary of Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Costs) (Details) false false R81.htm 41205 - Disclosure - Employee Benefit Plans (Fair Value of Pension Plan Assets by Asset Category) (Details) Sheet http://www.mbvt.com/role/DisclosureEmployeeBenefitPlansFairValueOfPensionPlanAssetsByAssetCategoryDetails Employee Benefit Plans (Fair Value of Pension Plan Assets by Asset Category) (Details) false false R82.htm 41206 - Disclosure - Employee Benefit Plans (Summary of Estimated Future Benefit Payments Expected to be Paid Under the Plan) (Details) Sheet http://www.mbvt.com/role/DisclosureEmployeeBenefitPlansSummaryOfEstimatedFutureBenefitPaymentsExpectedToBePaidUnderPlanDetails Employee Benefit Plans (Summary of Estimated Future Benefit Payments Expected to be Paid Under the Plan) (Details) false false R83.htm 41207 - Disclosure - Employee Benefit Plans (Summary of Expense Relating to Various Employee Benefit Plans) (Details) Sheet http://www.mbvt.com/role/DisclosureEmployeeBenefitPlansSummaryOfExpenseRelatingToVariousEmployeeBenefitPlansDetails Employee Benefit Plans (Summary of Expense Relating to Various Employee Benefit Plans) (Details) false false R84.htm 41301 - Disclosure - Stock-Based Compensation Plans (Narrative) (Details) Sheet http://www.mbvt.com/role/DisclosureStockBasedCompensationPlansNarrativeDetails Stock-Based Compensation Plans (Narrative) (Details) false false R85.htm 41302 - Disclosure - Stock-Based Compensation Plans (Stock Option Plan) (Details) Sheet http://www.mbvt.com/role/DisclosureStockBasedCompensationPlansStockOptionPlanDetails Stock-Based Compensation Plans (Stock Option Plan) (Details) false false R86.htm 41401 - Disclosure - Earnings Per Share (Reconciliations And Calculations Of Basic And Diluted Earnings Per Share) (Details) Sheet http://www.mbvt.com/role/DisclosureEarningsPerShareReconciliationsAndCalculationsOfBasicAndDilutedEarningsPerShareDetails Earnings Per Share (Reconciliations And Calculations Of Basic And Diluted Earnings Per Share) (Details) false false R87.htm 41501 - Disclosure - Parent Company (Balance Sheets) (Details) Sheet http://www.mbvt.com/role/DisclosureParentCompanyBalanceSheetsDetails Parent Company (Balance Sheets) (Details) false false R88.htm 41502 - Disclosure - Parent Company (Statements of Income) (Details) Sheet http://www.mbvt.com/role/DisclosureParentCompanyStatementsOfIncomeDetails Parent Company (Statements of Income) (Details) false false R89.htm 41503 - Disclosure - Parent Company (Statements of Cash Flows) (Details) Sheet http://www.mbvt.com/role/DisclosureParentCompanyStatementsOfCashFlowsDetails Parent Company (Statements of Cash Flows) (Details) false false R90.htm 41601 - Disclosure - Commitments And Contingencies (Details) Sheet http://www.mbvt.com/role/DisclosureCommitmentsAndContingenciesDetails Commitments And Contingencies (Details) false false R91.htm 41701 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss) By Component) (Details) Sheet http://www.mbvt.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAccumulatedOtherComprehensiveIncomeLossByComponentDetails Accumulated Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss) By Component) (Details) false false R92.htm 41702 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Reclassification Adjustment Details) (Details) Sheet http://www.mbvt.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossReclassificationAdjustmentDetailsDetails Accumulated Other Comprehensive Income (Loss) (Reclassification Adjustment Details) (Details) false false R93.htm 41801 - Disclosure - Regulatory Capital Requirements (Details) Sheet http://www.mbvt.com/role/DisclosureRegulatoryCapitalRequirementsDetails Regulatory Capital Requirements (Details) false false R94.htm 41901 - Disclosure - Derivative Financial Instruments (Details) Sheet http://www.mbvt.com/role/DisclosureDerivativeFinancialInstrumentsDetails Derivative Financial Instruments (Details) false false All Reports Book All Reports Element mbvt_StateFranchiseTaxes had a mix of decimals attribute values: -4 -3. Element us-gaap_DerivativeInstrumentsLossRecognizedInOtherComprehensiveIncomeEffectivePortion had a mix of decimals attribute values: -4 -3. Element us-gaap_FinancingReceivableRecordedInvestmentPastDue had a mix of decimals attribute values: -3 0. Element us-gaap_InterestExpenseTrustPreferredSecurities had a mix of decimals attribute values: -4 -3. Element us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax had a mix of decimals attribute values: -5 -3. Element us-gaap_PaymentsOfDebtExtinguishmentCosts had a mix of decimals attribute values: -3 0. 'Monetary' elements on report '00200 - Statement - Consolidated Statements Of Income' had a mix of different decimal attribute values. 'Monetary' elements on report '40301 - Disclosure - Investment Securities (Narrative) (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '40401 - Disclosure - Loans And The Allowance For Credit Losses (Narrative) (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '40405 - Disclosure - Loans And The Allowance For Credit Losses (Recorded Investment Of Loans, Including Nonaccrual And Restructured Loans, By Class) (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '40601 - Disclosure - Premises and Equipment (Narrative) (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '40901 - Disclosure - Long-Term Debt (Narrative) (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '41001 - Disclosure - Trust Preferred Securities (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '41201 - Disclosure - Employee Benefit Plans (Narrative) (Details)' had a mix of different decimal attribute values. 'Shares' elements on report '41401 - Disclosure - Earnings Per Share (Reconciliations And Calculations Of Basic And Diluted Earnings Per Share) (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '41601 - Disclosure - Commitments And Contingencies (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '41801 - Disclosure - Regulatory Capital Requirements (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '41901 - Disclosure - Derivative Financial Instruments (Details)' had a mix of different decimal attribute values. Process Flow-Through: 00100 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Dec. 31, 2011' Process Flow-Through: Removing column 'Dec. 31, 2010' Process Flow-Through: 00105 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: 00200 - Statement - Consolidated Statements Of Income Process Flow-Through: 00300 - Statement - Consolidated Statements Of Comprehensive Income Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2013' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2013' Process Flow-Through: 00305 - Statement - Consolidated Statements Of Comprehensive Income (Parenthetical) Process Flow-Through: 00405 - Statement - Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) Process Flow-Through: 00500 - Statement - Consolidated Statements Of Cash Flows mbvt-20131231.xml mbvt-20131231.xsd mbvt-20131231_cal.xml mbvt-20131231_def.xml mbvt-20131231_lab.xml mbvt-20131231_pre.xml true true