3.3.1.900 html 469 580 1 true 115 0 false 6 false false R1.htm 00090 - Document - Document and Entity Information Sheet http://www.cbtc.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 00100 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://www.cbtc.com/role/StatementConsolidatedBalanceSheets CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 00101 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://www.cbtc.com/role/StatementConsolidatedBalanceSheetsParenthetical CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 3 false false R4.htm 00200 - Statement - CONSOLIDATED STATEMENTS OF INCOME Sheet http://www.cbtc.com/role/StatementConsolidatedStatementsOfIncome CONSOLIDATED STATEMENTS OF INCOME Statements 4 false false R5.htm 00300 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://www.cbtc.com/role/StatementConsolidatedStatementsOfComprehensiveIncome CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 5 false false R6.htm 00350 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) Sheet http://www.cbtc.com/role/StatementConsolidatedStatementsOfComprehensiveIncomeParenthetical CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) Statements 6 false false R7.htm 00400 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Sheet http://www.cbtc.com/role/StatementConsolidatedStatementsOfChangesInStockholdersEquity CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Statements 7 false false R8.htm 00450 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) Sheet http://www.cbtc.com/role/StatementConsolidatedStatementsOfChangesInStockholdersEquityParenthetical CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) Statements 8 false false R9.htm 00500 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.cbtc.com/role/StatementConsolidatedStatementsOfCashFlows CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 9 false false R10.htm 10101 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.cbtc.com/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 10 false false R11.htm 10201 - Disclosure - Accumulated Other Comprehensive Income Sheet http://www.cbtc.com/role/DisclosureAccumulatedOtherComprehensiveIncome Accumulated Other Comprehensive Income Notes 11 false false R12.htm 10301 - Disclosure - Earnings Per Share Sheet http://www.cbtc.com/role/DisclosureEarningsPerShare Earnings Per Share Notes 12 false false R13.htm 10401 - Disclosure - Restrictions on Cash and Amounts Due from Banks Sheet http://www.cbtc.com/role/DisclosureRestrictionsOnCashAndAmountsDueFromBanks Restrictions on Cash and Amounts Due from Banks Notes 13 false false R14.htm 10501 - Disclosure - Securities Sheet http://www.cbtc.com/role/DisclosureSecurities Securities Notes 14 false false R15.htm 10601 - Disclosure - Loans Sheet http://www.cbtc.com/role/DisclosureLoans Loans Notes 15 false false R16.htm 10701 - Disclosure - Loan Servicing Sheet http://www.cbtc.com/role/DisclosureLoanServicing Loan Servicing Notes 16 false false R17.htm 10801 - Disclosure - Other Real Estate Owned ("OREO") Sheet http://www.cbtc.com/role/DisclosureOtherRealEstateOwnedoreo Other Real Estate Owned ("OREO") Notes 17 false false R18.htm 10901 - Disclosure - Premises and Equipment and Held for Sale Premises and Equipment Sheet http://www.cbtc.com/role/DisclosurePremisesAndEquipmentAndHeldForSalePremisesAndEquipment Premises and Equipment and Held for Sale Premises and Equipment Notes 18 false false R19.htm 11001 - Disclosure - Deposits Sheet http://www.cbtc.com/role/DisclosureDeposits Deposits Notes 19 false false R20.htm 11101 - Disclosure - Short-Term Borrowings and Long-Term Debt Sheet http://www.cbtc.com/role/DisclosureShortTermBorrowingsAndLongTermDebt Short-Term Borrowings and Long-Term Debt Notes 20 false false R21.htm 11201 - Disclosure - Income Taxes Sheet http://www.cbtc.com/role/DisclosureIncomeTaxes Income Taxes Notes 21 false false R22.htm 11301 - Disclosure - Commitments and Contingencies Sheet http://www.cbtc.com/role/DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 22 false false R23.htm 11401 - Disclosure - Stock-Based Compensation Sheet http://www.cbtc.com/role/DisclosureStockBasedCompensation Stock-Based Compensation Notes 23 false false R24.htm 11501 - Disclosure - Employee Benefit Plans Sheet http://www.cbtc.com/role/DisclosureEmployeeBenefitPlans Employee Benefit Plans Notes 24 false false R25.htm 11601 - Disclosure - Guaranteed Preferred Beneficial Interest in Junior Subordinated Debentures ("TRUPs") Sheet http://www.cbtc.com/role/DisclosureGuaranteedPreferredBeneficialInterestInJuniorSubordinatedDebenturestrups Guaranteed Preferred Beneficial Interest in Junior Subordinated Debentures ("TRUPs") Notes 25 false false R26.htm 11701 - Disclosure - Subordinated Notes Notes http://www.cbtc.com/role/DisclosureSubordinatedNotes Subordinated Notes Notes 26 false false R27.htm 11801 - Disclosure - Regulatory Capital Sheet http://www.cbtc.com/role/DisclosureRegulatoryCapital Regulatory Capital Notes 27 false false R28.htm 11901 - Disclosure - Fair Value Measurements Sheet http://www.cbtc.com/role/DisclosureFairValueMeasurements Fair Value Measurements Notes 28 false false R29.htm 12001 - Disclosure - Fair Value of Financial Instruments Sheet http://www.cbtc.com/role/DisclosureFairValueOfFinancialInstruments Fair Value of Financial Instruments Notes 29 false false R30.htm 12101 - Disclosure - Condensed Financial Statements - Parent Company Only Sheet http://www.cbtc.com/role/DisclosureCondensedFinancialStatementsParentCompanyOnly Condensed Financial Statements - Parent Company Only Notes 30 false false R31.htm 12201 - Disclosure - Quarterly Financial Comparison (Unaudited) Sheet http://www.cbtc.com/role/DisclosureQuarterlyFinancialComparisonUnaudited Quarterly Financial Comparison (Unaudited) Notes 31 false false R32.htm 20102 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.cbtc.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.cbtc.com/role/DisclosureSummaryOfSignificantAccountingPolicies 32 false false R33.htm 30203 - Disclosure - Accumulated Other Comprehensive Income (Tables) Sheet http://www.cbtc.com/role/DisclosureAccumulatedOtherComprehensiveIncomeTables Accumulated Other Comprehensive Income (Tables) Tables http://www.cbtc.com/role/DisclosureAccumulatedOtherComprehensiveIncome 33 false false R34.htm 30303 - Disclosure - Earnings Per Share (Tables) Sheet http://www.cbtc.com/role/DisclosureEarningsPerShareTables Earnings Per Share (Tables) Tables http://www.cbtc.com/role/DisclosureEarningsPerShare 34 false false R35.htm 30503 - Disclosure - Securities (Tables) Sheet http://www.cbtc.com/role/DisclosureSecuritiesTables Securities (Tables) Tables http://www.cbtc.com/role/DisclosureSecurities 35 false false R36.htm 30603 - Disclosure - Loans (Tables) Sheet http://www.cbtc.com/role/DisclosureLoansTables Loans (Tables) Tables http://www.cbtc.com/role/DisclosureLoans 36 false false R37.htm 30703 - Disclosure - Loan Servicing (Tables) Sheet http://www.cbtc.com/role/DisclosureLoanServicingTables Loan Servicing (Tables) Tables http://www.cbtc.com/role/DisclosureLoanServicing 37 false false R38.htm 30803 - Disclosure - Other Real Estate Owned ("OREO") (Tables) Sheet http://www.cbtc.com/role/DisclosureOtherRealEstateOwnedoreoTables Other Real Estate Owned ("OREO") (Tables) Tables http://www.cbtc.com/role/DisclosureOtherRealEstateOwnedoreo 38 false false R39.htm 30903 - Disclosure - Premises and Equipment and Held for Sale Premises and Equipment (Tables) Sheet http://www.cbtc.com/role/DisclosurePremisesAndEquipmentAndHeldForSalePremisesAndEquipmentTables Premises and Equipment and Held for Sale Premises and Equipment (Tables) Tables http://www.cbtc.com/role/DisclosurePremisesAndEquipmentAndHeldForSalePremisesAndEquipment 39 false false R40.htm 31003 - Disclosure - Deposits (Tables) Sheet http://www.cbtc.com/role/DisclosureDepositsTables Deposits (Tables) Tables http://www.cbtc.com/role/DisclosureDeposits 40 false false R41.htm 31103 - Disclosure - Short-Term Borrowings and Long-Term Debt (Tables) Sheet http://www.cbtc.com/role/DisclosureShortTermBorrowingsAndLongTermDebtTables Short-Term Borrowings and Long-Term Debt (Tables) Tables http://www.cbtc.com/role/DisclosureShortTermBorrowingsAndLongTermDebt 41 false false R42.htm 31203 - Disclosure - Income Taxes (Tables) Sheet http://www.cbtc.com/role/DisclosureIncomeTaxesTables Income Taxes (Tables) Tables http://www.cbtc.com/role/DisclosureIncomeTaxes 42 false false R43.htm 31403 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.cbtc.com/role/DisclosureStockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.cbtc.com/role/DisclosureStockBasedCompensation 43 false false R44.htm 31803 - Disclosure - Regulatory Capital (Tables) Sheet http://www.cbtc.com/role/DisclosureRegulatoryCapitalTables Regulatory Capital (Tables) Tables http://www.cbtc.com/role/DisclosureRegulatoryCapital 44 false false R45.htm 31903 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.cbtc.com/role/DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.cbtc.com/role/DisclosureFairValueMeasurements 45 false false R46.htm 32003 - Disclosure - Fair Value of Financial Instruments (Tables) Sheet http://www.cbtc.com/role/DisclosureFairValueOfFinancialInstrumentsTables Fair Value of Financial Instruments (Tables) Tables http://www.cbtc.com/role/DisclosureFairValueOfFinancialInstruments 46 false false R47.htm 32103 - Disclosure - Condensed Financial Statements - Parent Company Only (Tables) Sheet http://www.cbtc.com/role/DisclosureCondensedFinancialStatementsParentCompanyOnlyTables Condensed Financial Statements - Parent Company Only (Tables) Tables http://www.cbtc.com/role/DisclosureCondensedFinancialStatementsParentCompanyOnly 47 false false R48.htm 32203 - Disclosure - Quarterly Financial Comparison (Unaudited) (Tables) Sheet http://www.cbtc.com/role/DisclosureQuarterlyFinancialComparisonUnauditedTables Quarterly Financial Comparison (Unaudited) (Tables) Tables http://www.cbtc.com/role/DisclosureQuarterlyFinancialComparisonUnaudited 48 false false R49.htm 40101 - Disclosure - Summary of Significant Accounting Policies (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureSummaryOfSignificantAccountingPoliciesNarrativeDetails Summary of Significant Accounting Policies (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies 49 false false R50.htm 40201 - Disclosure - Accumulated Other Comprehensive Income (Schedule of Comprehensive Income (Loss)) (Details) Sheet http://www.cbtc.com/role/DisclosureAccumulatedOtherComprehensiveIncomeScheduleOfComprehensiveIncomeLossDetails Accumulated Other Comprehensive Income (Schedule of Comprehensive Income (Loss)) (Details) Details http://www.cbtc.com/role/DisclosureAccumulatedOtherComprehensiveIncomeTables 50 false false R51.htm 40202 - Disclosure - Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) Sheet http://www.cbtc.com/role/DisclosureAccumulatedOtherComprehensiveIncomeScheduleOfAccumulatedOtherComprehensiveIncomeLossDetails Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) Details http://www.cbtc.com/role/DisclosureAccumulatedOtherComprehensiveIncomeTables 51 false false R52.htm 40301 - Disclosure - Earnings Per Share (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureEarningsPerShareNarrativeDetails Earnings Per Share (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureEarningsPerShareTables 52 false false R53.htm 40302 - Disclosure - Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) Sheet http://www.cbtc.com/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) Details http://www.cbtc.com/role/DisclosureEarningsPerShareTables 53 false false R54.htm 40401 - Disclosure - Restrictions on Cash and Amounts Due from Banks (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureRestrictionsOnCashAndAmountsDueFromBanksNarrativeDetails Restrictions on Cash and Amounts Due from Banks (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureRestrictionsOnCashAndAmountsDueFromBanks 54 false false R55.htm 40501 - Disclosure - Securities (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureSecuritiesNarrativeDetails Securities (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureSecuritiesTables 55 false false R56.htm 40502 - Disclosure - Securities (Fair Value to Amortized Cost Basis) (Details) Sheet http://www.cbtc.com/role/DisclosureSecuritiesFairValueToAmortizedCostBasisDetails Securities (Fair Value to Amortized Cost Basis) (Details) Details http://www.cbtc.com/role/DisclosureSecuritiesTables 56 false false R57.htm 40503 - Disclosure - Securities (Schedule of Unrealized Loss on Investments, AFS) (Details) Sheet http://www.cbtc.com/role/DisclosureSecuritiesScheduleOfUnrealizedLossOnInvestmentsAfsDetails Securities (Schedule of Unrealized Loss on Investments, AFS) (Details) Details http://www.cbtc.com/role/DisclosureSecuritiesTables 57 false false R58.htm 40504 - Disclosure - Securities (Schedule of Unrealized Loss on Investments, HTM) (Details) Sheet http://www.cbtc.com/role/DisclosureSecuritiesScheduleOfUnrealizedLossOnInvestmentsHtmDetails Securities (Schedule of Unrealized Loss on Investments, HTM) (Details) Details http://www.cbtc.com/role/DisclosureSecuritiesTables 58 false false R59.htm 40505 - Disclosure - Securities (Investments Classified by Contractual Maturity Date) (Details) Sheet http://www.cbtc.com/role/DisclosureSecuritiesInvestmentsClassifiedByContractualMaturityDateDetails Securities (Investments Classified by Contractual Maturity Date) (Details) Details http://www.cbtc.com/role/DisclosureSecuritiesTables 59 false false R60.htm 40506 - Disclosure - Securities (Financing Receivable Credit Quality Indicators) (Details) Sheet http://www.cbtc.com/role/DisclosureSecuritiesFinancingReceivableCreditQualityIndicatorsDetails Securities (Financing Receivable Credit Quality Indicators) (Details) Details http://www.cbtc.com/role/DisclosureSecuritiesTables 60 false false R61.htm 40601 - Disclosure - Loans (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureLoansNarrativeDetails Loans (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureLoansTables 61 false false R62.htm 40602 - Disclosure - Loans (Schedule of Accounts, Notes, Loans and Financing Receivable) (Details) Notes http://www.cbtc.com/role/DisclosureLoansScheduleOfAccountsNotesLoansAndFinancingReceivableDetails Loans (Schedule of Accounts, Notes, Loans and Financing Receivable) (Details) Details http://www.cbtc.com/role/DisclosureLoansTables 62 false false R63.htm 40603 - Disclosure - Loans (Schedule of Financing Receivables, Non-Accrual Status) (Details) Sheet http://www.cbtc.com/role/DisclosureLoansScheduleOfFinancingReceivablesNonAccrualStatusDetails Loans (Schedule of Financing Receivables, Non-Accrual Status) (Details) Details http://www.cbtc.com/role/DisclosureLoansTables 63 false false R64.htm 40604 - Disclosure - Loans (Past Due Financing Receivables) (Details) Sheet http://www.cbtc.com/role/DisclosureLoansPastDueFinancingReceivablesDetails Loans (Past Due Financing Receivables) (Details) Details http://www.cbtc.com/role/DisclosureLoansTables 64 false false R65.htm 40605 - Disclosure - Loans (Impaired Financing Receivables) (Details) Sheet http://www.cbtc.com/role/DisclosureLoansImpairedFinancingReceivablesDetails Loans (Impaired Financing Receivables) (Details) Details http://www.cbtc.com/role/DisclosureLoansTables 65 false false R66.htm 40606 - Disclosure - Loans (Troubled Debt Restructurings on Financing Receivables) (Details) Sheet http://www.cbtc.com/role/DisclosureLoansTroubledDebtRestructuringsOnFinancingReceivablesDetails Loans (Troubled Debt Restructurings on Financing Receivables) (Details) Details http://www.cbtc.com/role/DisclosureLoansTables 66 false false R67.htm 40607 - Disclosure - Loans (Allowance for Credit Losses on Financing Receivables) (Details) Sheet http://www.cbtc.com/role/DisclosureLoansAllowanceForCreditLossesOnFinancingReceivablesDetails Loans (Allowance for Credit Losses on Financing Receivables) (Details) Details http://www.cbtc.com/role/DisclosureLoansTables 67 false false R68.htm 40608 - Disclosure - Loans (Schedule of Financing Receivable Recorded Investment Credit Quality Indicator) (Details) Sheet http://www.cbtc.com/role/DisclosureLoansScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorDetails Loans (Schedule of Financing Receivable Recorded Investment Credit Quality Indicator) (Details) Details http://www.cbtc.com/role/DisclosureLoansTables 68 false false R69.htm 40609 - Disclosure - Loans (Loans Maturing in Portfolio Based on Contractual Terms) (Details) Sheet http://www.cbtc.com/role/DisclosureLoansLoansMaturingInPortfolioBasedOnContractualTermsDetails Loans (Loans Maturing in Portfolio Based on Contractual Terms) (Details) Details http://www.cbtc.com/role/DisclosureLoansTables 69 false false R70.htm 40610 - Disclosure - Loans (Loans Due After One Year) (Details) Sheet http://www.cbtc.com/role/DisclosureLoansLoansDueAfterOneYearDetails Loans (Loans Due After One Year) (Details) Details http://www.cbtc.com/role/DisclosureLoansTables 70 false false R71.htm 40611 - Disclosure - Loans - (Related Party Loans) (Details) Sheet http://www.cbtc.com/role/DisclosureLoansRelatedPartyLoansDetails Loans - (Related Party Loans) (Details) Details 71 false false R72.htm 40701 - Disclosure - Loan Servicing (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureLoanServicingNarrativeDetails Loan Servicing (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureLoanServicingTables 72 false false R73.htm 40702 - Disclosure - Loan Servicing (Schedule of Participating Mortgage Loans) (Details) Sheet http://www.cbtc.com/role/DisclosureLoanServicingScheduleOfParticipatingMortgageLoansDetails Loan Servicing (Schedule of Participating Mortgage Loans) (Details) Details http://www.cbtc.com/role/DisclosureLoanServicingTables 73 false false R74.htm 40801 - Disclosure - Other Real Estate Owned ("OREO") (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureOtherRealEstateOwnedoreoNarrativeDetails Other Real Estate Owned ("OREO") (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureOtherRealEstateOwnedoreoTables 74 false false R75.htm 40802 - Disclosure - Other Real Estate Owned ("OREO") (Foreclosed Real Estate Roll Forward) (Details) Sheet http://www.cbtc.com/role/DisclosureOtherRealEstateOwnedoreoForeclosedRealEstateRollForwardDetails Other Real Estate Owned ("OREO") (Foreclosed Real Estate Roll Forward) (Details) Details http://www.cbtc.com/role/DisclosureOtherRealEstateOwnedoreoTables 75 false false R76.htm 40803 - Disclosure - Other Real Estate Owned ("OREO") (Foreclosed Real Estate Expenses) (Details) Sheet http://www.cbtc.com/role/DisclosureOtherRealEstateOwnedoreoForeclosedRealEstateExpensesDetails Other Real Estate Owned ("OREO") (Foreclosed Real Estate Expenses) (Details) Details http://www.cbtc.com/role/DisclosureOtherRealEstateOwnedoreoTables 76 false false R77.htm 40901 - Disclosure - Premises and Equipment and Held for Sale Premises and Equipment (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosurePremisesAndEquipmentAndHeldForSalePremisesAndEquipmentNarrativeDetails Premises and Equipment and Held for Sale Premises and Equipment (Narrative) (Details) Details http://www.cbtc.com/role/DisclosurePremisesAndEquipmentAndHeldForSalePremisesAndEquipmentTables 77 false false R78.htm 40902 - Disclosure - Premises and Equipment and Held for Sale Premises and Equipment (Property, Plant and Equipment) (Details) Sheet http://www.cbtc.com/role/DisclosurePremisesAndEquipmentAndHeldForSalePremisesAndEquipmentPropertyPlantAndEquipmentDetails Premises and Equipment and Held for Sale Premises and Equipment (Property, Plant and Equipment) (Details) Details http://www.cbtc.com/role/DisclosurePremisesAndEquipmentAndHeldForSalePremisesAndEquipmentTables 78 false false R79.htm 40903 - Disclosure - Premises and Equipment and Held for Sale Premises and Equipment (Schedule of Future Minimum Rental Payments for Operating Leases) (Details) Sheet http://www.cbtc.com/role/DisclosurePremisesAndEquipmentAndHeldForSalePremisesAndEquipmentScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesDetails Premises and Equipment and Held for Sale Premises and Equipment (Schedule of Future Minimum Rental Payments for Operating Leases) (Details) Details http://www.cbtc.com/role/DisclosurePremisesAndEquipmentAndHeldForSalePremisesAndEquipmentTables 79 false false R80.htm 41001 - Disclosure - Deposits (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureDepositsNarrativeDetails Deposits (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureDepositsTables 80 false false R81.htm 41002 - Disclosure - Deposits (Schedule Of Deposits) (Details) Sheet http://www.cbtc.com/role/DisclosureDepositsScheduleOfDepositsDetails Deposits (Schedule Of Deposits) (Details) Details http://www.cbtc.com/role/DisclosureDepositsTables 81 false false R82.htm 41003 - Disclosure - Deposits (Schedule Of Deposits Maturities) (Details) Sheet http://www.cbtc.com/role/DisclosureDepositsScheduleOfDepositsMaturitiesDetails Deposits (Schedule Of Deposits Maturities) (Details) Details http://www.cbtc.com/role/DisclosureDepositsTables 82 false false R83.htm 41101 - Disclosure - Short-Term Borrowings and Long-Term Debt (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureShortTermBorrowingsAndLongTermDebtNarrativeDetails Short-Term Borrowings and Long-Term Debt (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureShortTermBorrowingsAndLongTermDebtTables 83 false false R84.htm 41102 - Disclosure - Short-Term Borrowings and Long-Term Debt (Schedule Related to the Classification of Debt Interest Rate) (Details) Sheet http://www.cbtc.com/role/DisclosureShortTermBorrowingsAndLongTermDebtScheduleRelatedToClassificationOfDebtInterestRateDetails Short-Term Borrowings and Long-Term Debt (Schedule Related to the Classification of Debt Interest Rate) (Details) Details http://www.cbtc.com/role/DisclosureShortTermBorrowingsAndLongTermDebtTables 84 false false R85.htm 41103 - Disclosure - Short-Term Borrowings and Long-Term Debt (Schedule of Debt) (Details) Sheet http://www.cbtc.com/role/DisclosureShortTermBorrowingsAndLongTermDebtScheduleOfDebtDetails Short-Term Borrowings and Long-Term Debt (Schedule of Debt) (Details) Details http://www.cbtc.com/role/DisclosureShortTermBorrowingsAndLongTermDebtTables 85 false false R86.htm 41104 - Disclosure - Short-Term Borrowings and Long-Term Debt (Schedule of Maturities of Long-term Debt) (Details) Sheet http://www.cbtc.com/role/DisclosureShortTermBorrowingsAndLongTermDebtScheduleOfMaturitiesOfLongTermDebtDetails Short-Term Borrowings and Long-Term Debt (Schedule of Maturities of Long-term Debt) (Details) Details http://www.cbtc.com/role/DisclosureShortTermBorrowingsAndLongTermDebtTables 86 false false R87.htm 41201 - Disclosure - Income Taxes (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureIncomeTaxesNarrativeDetails Income Taxes (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureIncomeTaxesTables 87 false false R88.htm 41202 - Disclosure - Income Taxes (Schedule of Allocation of Federal and State Income Taxes) (Details) Sheet http://www.cbtc.com/role/DisclosureIncomeTaxesScheduleOfAllocationOfFederalAndStateIncomeTaxesDetails Income Taxes (Schedule of Allocation of Federal and State Income Taxes) (Details) Details http://www.cbtc.com/role/DisclosureIncomeTaxesTables 88 false false R89.htm 41203 - Disclosure - Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) Sheet http://www.cbtc.com/role/DisclosureIncomeTaxesScheduleOfEffectiveIncomeTaxRateReconciliationDetails Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) Details http://www.cbtc.com/role/DisclosureIncomeTaxesTables 89 false false R90.htm 41204 - Disclosure - Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) Sheet http://www.cbtc.com/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) Details http://www.cbtc.com/role/DisclosureIncomeTaxesTables 90 false false R91.htm 41301 - Disclosure - Commitments and Contingencies (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureCommitmentsAndContingenciesNarrativeDetails Commitments and Contingencies (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureCommitmentsAndContingencies 91 false false R92.htm 41401 - Disclosure - Stock-Based Compensation (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureStockBasedCompensationNarrativeDetails Stock-Based Compensation (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureStockBasedCompensationTables 92 false false R93.htm 41402 - Disclosure - Stock-Based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) Sheet http://www.cbtc.com/role/DisclosureStockBasedCompensationScheduleOfShareBasedCompensationStockOptionsActivityDetails Stock-Based Compensation (Schedule of Share-based Compensation, Stock Options, Activity) (Details) Details http://www.cbtc.com/role/DisclosureStockBasedCompensationTables 93 false false R94.htm 41403 - Disclosure - Stock-Based Compensation (Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range) (Details) Sheet http://www.cbtc.com/role/DisclosureStockBasedCompensationScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeDetails Stock-Based Compensation (Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range) (Details) Details http://www.cbtc.com/role/DisclosureStockBasedCompensationTables 94 false false R95.htm 41404 - Disclosure - Stock-Based Compensation (Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity) (Details) Sheet http://www.cbtc.com/role/DisclosureStockBasedCompensationScheduleOfShareBasedCompensationRestrictedStockAndRestrictedStockUnitsActivityDetails Stock-Based Compensation (Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity) (Details) Details http://www.cbtc.com/role/DisclosureStockBasedCompensationTables 95 false false R96.htm 41501 - Disclosure - Employee Benefit Plans (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureEmployeeBenefitPlansNarrativeDetails Employee Benefit Plans (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureEmployeeBenefitPlans 96 false false R97.htm 41601 - Disclosure - Guaranteed Preferred Beneficial Interest in Junior Subordinated Debentures ("TRUPs") (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureGuaranteedPreferredBeneficialInterestInJuniorSubordinatedDebenturestrupsNarrativeDetails Guaranteed Preferred Beneficial Interest in Junior Subordinated Debentures ("TRUPs") (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureGuaranteedPreferredBeneficialInterestInJuniorSubordinatedDebenturestrups 97 false false R98.htm 41701 - Disclosure - Subordinated Notes (Details) Notes http://www.cbtc.com/role/DisclosureSubordinatedNotesDetails Subordinated Notes (Details) Details http://www.cbtc.com/role/DisclosureSubordinatedNotes 98 false false R99.htm 41801 - Disclosure - Regulatory Capital (Details) Sheet http://www.cbtc.com/role/DisclosureRegulatoryCapitalDetails Regulatory Capital (Details) Details http://www.cbtc.com/role/DisclosureRegulatoryCapitalTables 99 false false R100.htm 41901 - Disclosure - Fair Value Measurements (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureFairValueMeasurementsNarrativeDetails Fair Value Measurements (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureFairValueMeasurementsTables 100 false false R101.htm 41902 - Disclosure - Fair Value Measurements (Fair Value, Assets Measured on Recurring Basis) (Details) Sheet http://www.cbtc.com/role/DisclosureFairValueMeasurementsFairValueAssetsMeasuredOnRecurringBasisDetails Fair Value Measurements (Fair Value, Assets Measured on Recurring Basis) (Details) Details http://www.cbtc.com/role/DisclosureFairValueMeasurementsTables 101 false false R102.htm 41903 - Disclosure - Fair Value Measurements (Fair Value, Assets and Liabilities Measured on Nonrecurring Basis) (Details) Sheet http://www.cbtc.com/role/DisclosureFairValueMeasurementsFairValueAssetsAndLiabilitiesMeasuredOnNonrecurringBasisDetails Fair Value Measurements (Fair Value, Assets and Liabilities Measured on Nonrecurring Basis) (Details) Details http://www.cbtc.com/role/DisclosureFairValueMeasurementsTables 102 false false R103.htm 42001 - Disclosure - Fair Value of Financial Instruments (Narrative) (Details) Sheet http://www.cbtc.com/role/DisclosureFairValueOfFinancialInstrumentsNarrativeDetails Fair Value of Financial Instruments (Narrative) (Details) Details http://www.cbtc.com/role/DisclosureFairValueOfFinancialInstrumentsTables 103 false false R104.htm 42002 - Disclosure - Fair Value of Financial Instruments (Fair Value, by Balance Sheet Grouping) (Details) Sheet http://www.cbtc.com/role/DisclosureFairValueOfFinancialInstrumentsFairValueByBalanceSheetGroupingDetails Fair Value of Financial Instruments (Fair Value, by Balance Sheet Grouping) (Details) Details http://www.cbtc.com/role/DisclosureFairValueOfFinancialInstrumentsTables 104 false false R105.htm 42101 - Disclosure - Condensed Financial Statements - Parent Company Only (Schedule of Condensed Balance Sheet) (Details) Sheet http://www.cbtc.com/role/DisclosureCondensedFinancialStatementsParentCompanyOnlyScheduleOfCondensedBalanceSheetDetails Condensed Financial Statements - Parent Company Only (Schedule of Condensed Balance Sheet) (Details) Details http://www.cbtc.com/role/DisclosureCondensedFinancialStatementsParentCompanyOnlyTables 105 false false R106.htm 42102 - Disclosure - Condensed Financial Statements - Parent Company Only (Schedule of Condensed Income Statement) (Details) Sheet http://www.cbtc.com/role/DisclosureCondensedFinancialStatementsParentCompanyOnlyScheduleOfCondensedIncomeStatementDetails Condensed Financial Statements - Parent Company Only (Schedule of Condensed Income Statement) (Details) Details http://www.cbtc.com/role/DisclosureCondensedFinancialStatementsParentCompanyOnlyTables 106 false false R107.htm 42103 - Disclosure - Condensed Financial Statements - Parent Company Only (Schedule of Condensed Cash Flow Statement) (Details) Sheet http://www.cbtc.com/role/DisclosureCondensedFinancialStatementsParentCompanyOnlyScheduleOfCondensedCashFlowStatementDetails Condensed Financial Statements - Parent Company Only (Schedule of Condensed Cash Flow Statement) (Details) Details http://www.cbtc.com/role/DisclosureCondensedFinancialStatementsParentCompanyOnlyTables 107 false false R108.htm 42201 - Disclosure - Quarterly Financial Comparison (Unaudited) (Details) Sheet http://www.cbtc.com/role/DisclosureQuarterlyFinancialComparisonUnauditedDetails Quarterly Financial Comparison (Unaudited) (Details) Details http://www.cbtc.com/role/DisclosureQuarterlyFinancialComparisonUnauditedTables 108 false false All Reports Book All Reports tcfc-20151231.xml tcfc-20151231.xsd tcfc-20151231_cal.xml tcfc-20151231_def.xml tcfc-20151231_lab.xml tcfc-20151231_pre.xml true true