2.4.0.8 Html 498 354 1 false 69 0 false 11 false false R1.htm 101 - Document - Document and Entity Information Sheet http://www.cbtrustcorp.com/taxonomy/role/DocumentandEntityInformation Document and Entity Information true false R2.htm 103 - Statement - Consolidated Balance Sheets Sheet http://www.cbtrustcorp.com/taxonomy/role/StatementOfFinancialPositionClassified Consolidated Balance Sheets false false R3.htm 104 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.cbtrustcorp.com/taxonomy/role/StatementOfFinancialPositionClassifiedParenthetical Consolidated Balance Sheets (Parenthetical) false false R4.htm 105 - Statement - Consolidated Statements of Income Sheet http://www.cbtrustcorp.com/taxonomy/role/StatementOfIncome Consolidated Statements of Income false false R5.htm 106 - Statement - Consolidated Statements of Comprehensive Income (Loss) Sheet http://www.cbtrustcorp.com/taxonomy/role/StatementOfOtherComprehensiveIncome Consolidated Statements of Comprehensive Income (Loss) false false R6.htm 107 - Statement - Consolidated Statements of Shareholders' Equity Sheet http://www.cbtrustcorp.com/taxonomy/role/StatementOfShareholdersEquityAndOtherComprehensiveIncome Consolidated Statements of Shareholders' Equity false false R7.htm 108 - Statement - Consolidated Statements of Cash Flows Sheet http://www.cbtrustcorp.com/taxonomy/role/StatementOfCashFlowsIndirect Consolidated Statements of Cash Flows false false R8.htm 109 - Disclosure - Nature of Banking Activities and Significant Accounting Policies Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlock Nature of Banking Activities and Significant Accounting Policies false false R9.htm 110 - Disclosure - Securities Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock Securities false false R10.htm 111 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsLoansNotesTradeAndOtherReceivablesDisclosureTextBlock Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses false false R11.htm 112 - Disclosure - Loans Covered by FDIC Shared-Loss Agreements (Covered Loans) and Related Allowance for Loan Losses Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsLoansCoveredByFdicSharedLossAgreementCoveredLoansAndRelatedAllowanceForLoanLossesTextBlock Loans Covered by FDIC Shared-Loss Agreements (Covered Loans) and Related Allowance for Loan Losses false false R12.htm 113 - Disclosure - FDIC Agreements and FDIC Indemnification Asset Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsFdicAgreementsAndFdicIndemnificationAssetTextBlock FDIC Agreements and FDIC Indemnification Asset false false R13.htm 114 - Disclosure - Deposits Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsDepositLiabilitiesDisclosuresTextBlock Deposits false false R14.htm 115 - Disclosure - Long-Term Debt Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsLongTermDebtTextBlock Long-Term Debt false false R15.htm 116 - Disclosure - Accumulated Other Comprehensive Loss Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsComprehensiveIncomeNoteTextBlock Accumulated Other Comprehensive Loss false false R16.htm 117 - Disclosure - Fair Values of Assets and Liabilities Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock Fair Values of Assets and Liabilities false false R17.htm 118 - Disclosure - Earnings Per Common Share Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlock Earnings Per Common Share false false R18.htm 119 - Disclosure - Defined Benefit Plan Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsPensionAndOtherPostretirementBenefitsDisclosureTextBlock Defined Benefit Plan false false R19.htm 120 - Disclosure - Branch Sales Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsDisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock Branch Sales false false R20.htm 121 - Disclosure - Nature of Banking Activities and Significant Accounting Policies (Policies) Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureAndSignificantAccountingPoliciesTextBlockPolicies Nature of Banking Activities and Significant Accounting Policies (Policies) false false R21.htm 122 - Disclosure - Securities (Tables) Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsInvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlockTables Securities (Tables) false false R22.htm 123 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses (Tables) Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsLoansNotesTradeAndOtherReceivablesDisclosureTextBlockTables Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses (Tables) false false R23.htm 124 - Disclosure - Loans Covered by FDIC Shared-Loss Agreements (Covered Loans) and Related Allowance for Loan Losses (Tables) Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsLoansCoveredByFdicSharedLossAgreementCoveredLoansAndRelatedAllowanceForLoanLossesTextBlockTables Loans Covered by FDIC Shared-Loss Agreements (Covered Loans) and Related Allowance for Loan Losses (Tables) false false R24.htm 125 - Disclosure - FDIC Agreements and FDIC Indemnification Asset (Tables) Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsFdicAgreementsAndFdicIndemnificationAssetTextBlockTables FDIC Agreements and FDIC Indemnification Asset (Tables) false false R25.htm 126 - Disclosure - Deposits (Tables) Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsDepositLiabilitiesDisclosuresTextBlockTables Deposits (Tables) false false R26.htm 127 - Disclosure - Accumulated Other Comprehensive Loss (Tables) Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsComprehensiveIncomeNoteTextBlockTables Accumulated Other Comprehensive Loss (Tables) false false R27.htm 128 - Disclosure - Fair Values of Assets and Liabilities (Tables) Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlockTables Fair Values of Assets and Liabilities (Tables) false false R28.htm 129 - Disclosure - Earnings Per Common Share (Tables) Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlockTables Earnings Per Common Share (Tables) false false R29.htm 130 - Disclosure - Defined Benefit Plan (Tables) Sheet http://www.cbtrustcorp.com/taxonomy/role/NotesToFinancialStatementsPensionAndOtherPostretirementBenefitsDisclosureTextBlockTables Defined Benefit Plan (Tables) false false R30.htm 131 - Disclosure - Nature of Banking Activities and Significant Accounting Policies - Additional Information (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureNatureOfBankingActivitiesAndSignificantAccountingPoliciesAdditionalInformation Nature of Banking Activities and Significant Accounting Policies - Additional Information (Detail) false false R31.htm 132 - Disclosure - Securities - Amortized Costs and Fair Values of Securities Available for Sale and Held to Maturity (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureSecuritiesAmortizedCostsAndFairValuesOfSecuritiesAvailableForSaleAndHeldToMaturity Securities - Amortized Costs and Fair Values of Securities Available for Sale and Held to Maturity (Detail) false false R32.htm 133 - Disclosure - Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureSecuritiesAmortizedCostAndFairValueOfSecuritiesByContractualMaturity Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) false false R33.htm 134 - Disclosure - Securities - Additional Information (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureSecuritiesAdditionalInformation Securities - Additional Information (Detail) false false R34.htm 135 - Disclosure - Securities - Summary of Realized Gains and Losses on Sales of Securities (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureSecuritiesSummaryOfRealizedGainsAndLossesOnSalesOfSecurities Securities - Summary of Realized Gains and Losses on Sales of Securities (Detail) false false R35.htm 136 - Disclosure - Securities - Summary of Fair Value and Gross Unrealized Losses for Securities Available for Sale (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureSecuritiesSummaryOfFairValueAndGrossUnrealizedLossesForSecuritiesAvailableForSale Securities - Summary of Fair Value and Gross Unrealized Losses for Securities Available for Sale (Detail) false false R36.htm 137 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Summary of Non-Covered Loans (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansNotCoveredByFDICSharedLossAgreementNonCoveredLoansAndRelatedAllowanceForLoanLossesSummaryOfNonCoveredLoans Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Summary of Non-Covered Loans (Detail) false false R37.htm 138 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Additional Information (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansNotCoveredByFDICSharedLossAgreementNonCoveredLoansAndRelatedAllowanceForLoanLossesAdditionalInformation Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Additional Information (Detail) false false R38.htm 139 - Disclosure - Loans Not Covered By FDIC Shared-Loss Agreement (Non-Covered Loans) And Related Allowance For Loan Losses - Summary of Outstanding Principal Balance and Carrying Amounts of PCI Loans (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansNotCoveredByFDICSharedLossAgreementNonCoveredLoansAndRelatedAllowanceForLoanLossesSummaryOfOutstandingPrincipalBalanceAndCarryingAmountsOfPCILoans Loans Not Covered By FDIC Shared-Loss Agreement (Non-Covered Loans) And Related Allowance For Loan Losses - Summary of Outstanding Principal Balance and Carrying Amounts of PCI Loans (Detail) false false R39.htm 140 - Disclosure - Loans Not Covered By FDIC Shared-Loss Agreement (Non-Covered Loans) And Related Allowance For Loan Losses - Schedule of Change in Accretable Yield Balance for PCI Loans (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansNotCoveredByFDICSharedLossAgreementNonCoveredLoansAndRelatedAllowanceForLoanLossesScheduleOfChangeInAccretableYieldBalanceForPCILoans Loans Not Covered By FDIC Shared-Loss Agreement (Non-Covered Loans) And Related Allowance For Loan Losses - Schedule of Change in Accretable Yield Balance for PCI Loans (Detail) false false R40.htm 141 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Summary of Information Related to Impaired Loans (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansNotCoveredByFDICSharedLossAgreementNonCoveredLoansAndRelatedAllowanceForLoanLossesSummaryOfInformationRelatedToImpairedLoans Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Summary of Information Related to Impaired Loans (Detail) false false R41.htm 142 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Summary of Financial Receivable Impaired Average Recorded Investment (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansNotCoveredByFDICSharedLossAgreementNonCoveredLoansAndRelatedAllowanceForLoanLossesSummaryOfFinancialReceivableImpairedAverageRecordedInvestment Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Summary of Financial Receivable Impaired Average Recorded Investment (Detail) false false R42.htm 143 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Summarizes Non-Accrual Loans, Excluding PCI Loans, by Loan Category (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansNotCoveredByFDICSharedLossAgreementNonCoveredLoansAndRelatedAllowanceForLoanLossesSummarizesNonAccrualLoansExcludingPCILoansByLoanCategory Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Summarizes Non-Accrual Loans, Excluding PCI Loans, by Loan Category (Detail) false false R43.htm 144 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Reconciliation of Impaired Loans to Nonaccrual Loans (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansNotCoveredByFDICSharedLossAgreementNonCoveredLoansAndRelatedAllowanceForLoanLossesReconciliationOfImpairedLoansToNonaccrualLoans Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Reconciliation of Impaired Loans to Nonaccrual Loans (Detail) false false R44.htm 145 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Age Analysis of Past Due Status of Non-Covered Loans, Excluding PCI Loans (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansNotCoveredByFDICSharedLossAgreementNonCoveredLoansAndRelatedAllowanceForLoanLossesAgeAnalysisOfPastDueStatusOfNonCoveredLoansExcludingPCILoans Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Age Analysis of Past Due Status of Non-Covered Loans, Excluding PCI Loans (Detail) false false R45.htm 146 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Allowance for Loan Losses on Non-Covered Loans, Excluding PCI Loans, by Segment (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansNotCoveredByFDICSharedLossAgreementNonCoveredLoansAndRelatedAllowanceForLoanLossesAllowanceForLoanLossesOnNonCoveredLoansExcludingPCILoansBySegment Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Allowance for Loan Losses on Non-Covered Loans, Excluding PCI Loans, by Segment (Detail) false false R46.htm 147 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Non-Covered Loans Evaluated for Impairment (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansNotCoveredByFDICSharedLossAgreementNonCoveredLoansAndRelatedAllowanceForLoanLossesNonCoveredLoansEvaluatedForImpairment Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Non-Covered Loans Evaluated for Impairment (Detail) false false R47.htm 148 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Non-Covered Loans Evaluated for Impairment (Parenthetical) (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansNotCoveredByFDICSharedLossAgreementNonCoveredLoansAndRelatedAllowanceForLoanLossesNonCoveredLoansEvaluatedForImpairmentParenthetical Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Non-Covered Loans Evaluated for Impairment (Parenthetical) (Detail) false false R48.htm 149 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Non-Covered Loans, Excluding PCI Loans, by Credit Quality Indicator (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansNotCoveredByFDICSharedLossAgreementNonCoveredLoansAndRelatedAllowanceForLoanLossesNonCoveredLoansExcludingPCILoansByCreditQualityIndicator Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Non-Covered Loans, Excluding PCI Loans, by Credit Quality Indicator (Detail) false false R49.htm 150 - Disclosure - Loans Covered by FDIC Shared-loss Agreements (Covered Loans) and Related Allowance for Loan Losses - Additional Information (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansCoveredByFDICSharedlossAgreementsCoveredLoansAndRelatedAllowanceForLoanLossesAdditionalInformation Loans Covered by FDIC Shared-loss Agreements (Covered Loans) and Related Allowance for Loan Losses - Additional Information (Detail) false false R50.htm 151 - Disclosure - Loans Covered by FDIC Shared-Loss Agreements (Covered Loans) and Related Allowance for Loan Losses - Summary of Covered Loans (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansCoveredByFDICSharedLossAgreementsCoveredLoansAndRelatedAllowanceForLoanLossesSummaryOfCoveredLoans Loans Covered by FDIC Shared-Loss Agreements (Covered Loans) and Related Allowance for Loan Losses - Summary of Covered Loans (Detail) false false R51.htm 152 - Disclosure - Loans Covered by FDIC Shared-Loss Agreements (Covered Loans) and Related Allowance for Loan Losses - Summary of Covered Loans Collectively Evaluated for Impairment in the Allowance for Loan Losses (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansCoveredByFDICSharedLossAgreementsCoveredLoansAndRelatedAllowanceForLoanLossesSummaryOfCoveredLoansCollectivelyEvaluatedForImpairmentInTheAllowanceForLoanLosses Loans Covered by FDIC Shared-Loss Agreements (Covered Loans) and Related Allowance for Loan Losses - Summary of Covered Loans Collectively Evaluated for Impairment in the Allowance for Loan Losses (Detail) false false R52.htm 153 - Disclosure - Loans Covered by FDIC Shared-Loss Agreements (Covered Loans) and Related Allowance for Loan Losses - Summary of Changes in accretable Yield (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLoansCoveredByFDICSharedLossAgreementsCoveredLoansAndRelatedAllowanceForLoanLossesSummaryOfChangesInAccretableYield Loans Covered by FDIC Shared-Loss Agreements (Covered Loans) and Related Allowance for Loan Losses - Summary of Changes in accretable Yield (Detail) false false R53.htm 154 - Disclosure - FDIC Agreements and FDIC Indemnification Asset - Additional Information (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureFDICAgreementsAndFDICIndemnificationAssetAdditionalInformation FDIC Agreements and FDIC Indemnification Asset - Additional Information (Detail) false false R54.htm 155 - Disclosure - FDIC Agreements and FDIC Indemnification Asset - Summary Balances of FDIC Indemnification Asset (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureFDICAgreementsAndFDICIndemnificationAssetSummaryBalancesOfFDICIndemnificationAsset FDIC Agreements and FDIC Indemnification Asset - Summary Balances of FDIC Indemnification Asset (Detail) false false R55.htm 156 - Disclosure - Deposits - Summary of Interest Bearing Deposits (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureDepositsSummaryOfInterestBearingDeposits Deposits - Summary of Interest Bearing Deposits (Detail) false false R56.htm 157 - Disclosure - Long-Term Debt - Additional Information (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureLongTermDebtAdditionalInformation Long-Term Debt - Additional Information (Detail) false false R57.htm 158 - Disclosure - Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive (Loss) Income (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureAccumulatedOtherComprehensiveLossSummaryOfAccumulatedOtherComprehensiveLossIncome Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive (Loss) Income (Detail) false false R58.htm 159 - Disclosure - Accumulated Other Comprehensive Loss - Effects of Reclassifications Out of AOCI (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureAccumulatedOtherComprehensiveLossEffectsOfReclassificationsOutOfAOCI Accumulated Other Comprehensive Loss - Effects of Reclassifications Out of AOCI (Detail) false false R59.htm 160 - Disclosure - Fair Values of Assets and Liabilities - Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureFairValuesOfAssetsAndLiabilitiesAssetsAndLiabilitiesRecordedAtFairValueOnRecurringBasis Fair Values of Assets and Liabilities - Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) false false R60.htm 161 - Disclosure - Fair Values of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureFairValuesOfAssetsAndLiabilitiesAssetsAndLiabilitiesMeasuredAtFairValueOnNonrecurringBasis Fair Values of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) false false R61.htm 162 - Disclosure - Fair Values of Assets and Liabilities - Additional Information (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureFairValuesOfAssetsAndLiabilitiesAdditionalInformation Fair Values of Assets and Liabilities - Additional Information (Detail) false false R62.htm 163 - Disclosure - Fair Values of Assets and Liabilities - Summary of Fair Value of Financial Instruments (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureFairValuesOfAssetsAndLiabilitiesSummaryOfFairValueOfFinancialInstruments Fair Values of Assets and Liabilities - Summary of Fair Value of Financial Instruments (Detail) false false R63.htm 164 - Disclosure - Earnings Per Common Share - Computation of Earnings per Share (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureEarningsPerCommonShareComputationOfEarningsPerShare Earnings Per Common Share - Computation of Earnings per Share (Detail) false false R64.htm 165 - Disclosure - Earnings Per Common Share - Additional Information (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureEarningsPerCommonShareAdditionalInformation Earnings Per Common Share - Additional Information (Detail) false false R65.htm 166 - Disclosure - Defined Benefit Plan - Additional Information (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureDefinedBenefitPlanAdditionalInformation Defined Benefit Plan - Additional Information (Detail) false false R66.htm 167 - Disclosure - Defined Benefit Plan - Components of Net Periodic Benefit Cost for Plan (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureDefinedBenefitPlanComponentsOfNetPeriodicBenefitCostForPlan Defined Benefit Plan - Components of Net Periodic Benefit Cost for Plan (Detail) false false R67.htm 168 - Disclosure - Branch Sales - Additional Information (Detail) Sheet http://www.cbtrustcorp.com/taxonomy/role/DisclosureBranchSalesAdditionalInformation Branch Sales - Additional Information (Detail) false false All Reports Book All Reports Element esxb_LoansAndLeasesPercentageOfCoveredLoans had a mix of decimals attribute values: 0 4. Element esxb_PercentOfNonCoveredLoans had a mix of decimals attribute values: 0 4. Element us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet had a mix of decimals attribute values: -5 -3. Element us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance had a mix of decimals attribute values: -5 -3. Element us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome had a mix of decimals attribute values: -5 -3. Element us-gaap_PropertyPlantAndEquipmentNet had a mix of decimals attribute values: -5 -3 0. 'Monetary' elements on report '134 - Disclosure - Securities - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '138 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '148 - Disclosure - Loans Not Covered by FDIC Shared-Loss Agreement (Non-Covered Loans) and Related Allowance for Loan Losses - Non-Covered Loans Evaluated for Impairment (Parenthetical) (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '150 - Disclosure - Loans Covered by FDIC Shared-loss Agreements (Covered Loans) and Related Allowance for Loan Losses - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '154 - Disclosure - FDIC Agreements and FDIC Indemnification Asset - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '165 - Disclosure - Earnings Per Common Share - Additional Information (Detail)' had a mix of different decimal attribute values. Process Flow-Through: 103 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Mar. 31, 2014' Process Flow-Through: Removing column 'Jun. 30, 2013' Process Flow-Through: Removing column 'Mar. 31, 2013' Process Flow-Through: Removing column 'Dec. 31, 2012' Process Flow-Through: 104 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: 105 - Statement - Consolidated Statements of Income Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2013' Process Flow-Through: 106 - Statement - Consolidated Statements of Comprehensive Income (Loss) Process Flow-Through: 108 - Statement - Consolidated Statements of Cash Flows esxb-20140630.xml esxb-20140630.xsd esxb-20140630_cal.xml esxb-20140630_def.xml esxb-20140630_lab.xml esxb-20140630_pre.xml true true