3.26.1 html 466 367 1 true 100 0 false 4 false false R1.htm 995100 - Document - Cover Sheet http://xbrl.sec.gov/dei/role/document/Cover Cover Cover 1 false false R2.htm 995301 - Statement - Consolidated Balance Sheets Sheet http://www.ir.cbtn.com/role/ConsolidatedBalanceSheet Consolidated Balance Sheets Statements 2 false false R3.htm 995302 - Statement - Consolidated Balance Sheets (Parentheticals) Sheet http://www.ir.cbtn.com/role/ConsolidatedBalanceSheet_Parentheticals Consolidated Balance Sheets (Parentheticals) Statements 3 false false R4.htm 995303 - Statement - Consolidated Statements of Income (Unaudited) Sheet http://www.ir.cbtn.com/role/ConsolidatedIncomeStatement Consolidated Statements of Income (Unaudited) Statements 4 false false R5.htm 995304 - Statement - Consolidated Statements of Comprehensive Income (Unaudited) Sheet http://www.ir.cbtn.com/role/ConsolidatedComprehensiveIncome Consolidated Statements of Comprehensive Income (Unaudited) Statements 5 false false R6.htm 995305 - Statement - Consolidated Statements of Changes in Shareholders??? Equity (Unaudited) Sheet http://www.ir.cbtn.com/role/ShareholdersEquityType2or3 Consolidated Statements of Changes in Shareholders??? Equity (Unaudited) Statements 6 false false R7.htm 995306 - Statement - Consolidated Statements of Changes in Shareholders??? Equity (Unaudited) (Parentheticals) Sheet http://www.ir.cbtn.com/role/ShareholdersEquityType2or3_Parentheticals Consolidated Statements of Changes in Shareholders??? Equity (Unaudited) (Parentheticals) Statements 7 false false R8.htm 995307 - Statement - Consolidated Statements of Cash Flows (Unaudited) Sheet http://www.ir.cbtn.com/role/ConsolidatedCashFlow Consolidated Statements of Cash Flows (Unaudited) Statements 8 false false R9.htm 995308 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.ir.cbtn.com/role/SummaryofSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 9 false false R10.htm 995309 - Disclosure - Securities Sheet http://www.ir.cbtn.com/role/Securities Securities Notes 10 false false R11.htm 995310 - Disclosure - Loans and Allowance for Credit Losses (ACL) Sheet http://www.ir.cbtn.com/role/LoansandAllowanceforCreditLossesACL Loans and Allowance for Credit Losses (ACL) Notes 11 false false R12.htm 995311 - Disclosure - Premises and Equipment Sheet http://www.ir.cbtn.com/role/PremisesandEquipment Premises and Equipment Notes 12 false false R13.htm 995312 - Disclosure - Other Intangible Assets Sheet http://www.ir.cbtn.com/role/OtherIntangibleAssets Other Intangible Assets Notes 13 false false R14.htm 995313 - Disclosure - Short-Term Borrowings Sheet http://www.ir.cbtn.com/role/ShortTermBorrowings Short-Term Borrowings Notes 14 false false R15.htm 995314 - Disclosure - Long-Term Debt Sheet http://www.ir.cbtn.com/role/LongTermDebt Long-Term Debt Notes 15 false false R16.htm 995315 - Disclosure - Regulatory Matters Sheet http://www.ir.cbtn.com/role/RegulatoryMatters Regulatory Matters Notes 16 false false R17.htm 995316 - Disclosure - Stock-Based Compensation Sheet http://www.ir.cbtn.com/role/StockBasedCompensation Stock-Based Compensation Notes 17 false false R18.htm 995317 - Disclosure - Disclosures About Fair Value of Assets and Liabilities Sheet http://www.ir.cbtn.com/role/DisclosuresAboutFairValueofAssetsandLiabilities Disclosures About Fair Value of Assets and Liabilities Notes 18 false false R19.htm 995318 - Disclosure - Significant Estimates and Concentrations Sheet http://www.ir.cbtn.com/role/SignificantEstimatesandConcentrations Significant Estimates and Concentrations Notes 19 false false R20.htm 995319 - Disclosure - Commitments and Contingencies Sheet http://www.ir.cbtn.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 20 false false R21.htm 995320 - Disclosure - Derivatives Not Designated as Hedges Sheet http://www.ir.cbtn.com/role/DerivativesNotDesignatedasHedges Derivatives Not Designated as Hedges Notes 21 false false R22.htm 995321 - Disclosure - Earnings Per Share Sheet http://www.ir.cbtn.com/role/EarningsPerShare Earnings Per Share Notes 22 false false R23.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 23 false false R24.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 24 false false R25.htm 996000 - Disclosure - Accounting Policies, by Policy (Policies) Sheet http://www.ir.cbtn.com/role/AccountingPoliciesByPolicy Accounting Policies, by Policy (Policies) Policies http://www.ir.cbtn.com/role/SummaryofSignificantAccountingPolicies 25 false false R26.htm 996001 - Disclosure - Securities (Tables) Sheet http://www.ir.cbtn.com/role/SecuritiesTables Securities (Tables) Tables http://www.ir.cbtn.com/role/Securities 26 false false R27.htm 996002 - Disclosure - Loans and Allowance for Credit Losses (ACL) (Tables) Sheet http://www.ir.cbtn.com/role/LoansandAllowanceforCreditLossesACLTables Loans and Allowance for Credit Losses (ACL) (Tables) Tables http://www.ir.cbtn.com/role/LoansandAllowanceforCreditLossesACL 27 false false R28.htm 996003 - Disclosure - Premises and Equipment (Tables) Sheet http://www.ir.cbtn.com/role/PremisesandEquipmentTables Premises and Equipment (Tables) Tables http://www.ir.cbtn.com/role/PremisesandEquipment 28 false false R29.htm 996004 - Disclosure - Other Intangible Assets (Tables) Sheet http://www.ir.cbtn.com/role/OtherIntangibleAssetsTables Other Intangible Assets (Tables) Tables http://www.ir.cbtn.com/role/OtherIntangibleAssets 29 false false R30.htm 996005 - Disclosure - Short-Term Borrowings (Tables) Sheet http://www.ir.cbtn.com/role/ShortTermBorrowingsTables Short-Term Borrowings (Tables) Tables http://www.ir.cbtn.com/role/ShortTermBorrowings 30 false false R31.htm 996006 - Disclosure - Long-Term Debt (Tables) Sheet http://www.ir.cbtn.com/role/LongTermDebtTables Long-Term Debt (Tables) Tables http://www.ir.cbtn.com/role/LongTermDebt 31 false false R32.htm 996007 - Disclosure - Regulatory Matters (Tables) Sheet http://www.ir.cbtn.com/role/RegulatoryMattersTables Regulatory Matters (Tables) Tables http://www.ir.cbtn.com/role/RegulatoryMatters 32 false false R33.htm 996008 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.ir.cbtn.com/role/StockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.ir.cbtn.com/role/StockBasedCompensation 33 false false R34.htm 996009 - Disclosure - Disclosures About Fair Value of Assets and Liabilities (Tables) Sheet http://www.ir.cbtn.com/role/DisclosuresAboutFairValueofAssetsandLiabilitiesTables Disclosures About Fair Value of Assets and Liabilities (Tables) Tables http://www.ir.cbtn.com/role/DisclosuresAboutFairValueofAssetsandLiabilities 34 false false R35.htm 996010 - Disclosure - Derivatives Not Designated as Hedges (Tables) Sheet http://www.ir.cbtn.com/role/DerivativesNotDesignatedasHedgesTables Derivatives Not Designated as Hedges (Tables) Tables http://www.ir.cbtn.com/role/DerivativesNotDesignatedasHedges 35 false false R36.htm 996011 - Disclosure - Earnings Per Share (Tables) Sheet http://www.ir.cbtn.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://www.ir.cbtn.com/role/EarningsPerShare 36 false false R37.htm 996012 - Disclosure - Summary of Significant Accounting Policies (Details) Sheet http://www.ir.cbtn.com/role/SummaryofSignificantAccountingPoliciesDetails Summary of Significant Accounting Policies (Details) Details 37 false false R38.htm 996013 - Disclosure - Securities (Details) Sheet http://www.ir.cbtn.com/role/SecuritiesDetails Securities (Details) Details http://www.ir.cbtn.com/role/SecuritiesTables 38 false false R39.htm 996014 - Disclosure - Securities - Schedule of Amortized Cost and Approximate Fair Values, together with Gross Unrealized Gains and Losses, of Securities (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofAmortizedCostandApproximateFairValuestogetherwithGrossUnrealizedGainsandLossesofSecuritiesTable Securities - Schedule of Amortized Cost and Approximate Fair Values, together with Gross Unrealized Gains and Losses, of Securities (Details) Details 39 false false R40.htm 996015 - Disclosure - Securities - Schedule of Amortized Cost and Fair value of Available-for-Sale Securities and Held-to-Maturity Securities (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofAmortizedCostandFairvalueofAvailableforSaleSecuritiesandHeldtoMaturitySecuritiesTable Securities - Schedule of Amortized Cost and Fair value of Available-for-Sale Securities and Held-to-Maturity Securities (Details) Details 40 false false R41.htm 996016 - Disclosure - Securities - Schedule of Investments Gross Unrealized Losses and Fair Value (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofInvestmentsGrossUnrealizedLossesandFairValueTable Securities - Schedule of Investments Gross Unrealized Losses and Fair Value (Details) Details 41 false false R42.htm 996017 - Disclosure - Loans and Allowance for Credit Losses (ACL) (Details) Sheet http://www.ir.cbtn.com/role/LoansandAllowanceforCreditLossesACLDetails Loans and Allowance for Credit Losses (ACL) (Details) Details http://www.ir.cbtn.com/role/LoansandAllowanceforCreditLossesACLTables 42 false false R43.htm 996018 - Disclosure - Loans and Allowance for Credit Losses (ACL) - Schedule of Loan Portfolio Segmentation (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofLoanPortfolioSegmentationTable Loans and Allowance for Credit Losses (ACL) - Schedule of Loan Portfolio Segmentation (Details) Details http://www.ir.cbtn.com/role/LoansandAllowanceforCreditLossesACLTables 43 false false R44.htm 996019 - Disclosure - Loans and Allowance for Credit Losses (ACL) - Schedule of Following Tables Detail Activity in the ACL by Portfolio Segment (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofFollowingTablesDetailActivityintheACLbyPortfolioSegmentTable Loans and Allowance for Credit Losses (ACL) - Schedule of Following Tables Detail Activity in the ACL by Portfolio Segment (Details) Details http://www.ir.cbtn.com/role/LoansandAllowanceforCreditLossesACLTables 44 false false R45.htm 996020 - Disclosure - Loans and Allowance for Credit Losses (ACL) - Schedule of Company???s Recorded Investment in Loans by Credit Quality Indicators (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofCompanysRecordedInvestmentinLoansbyCreditQualityIndicatorsTable Loans and Allowance for Credit Losses (ACL) - Schedule of Company???s Recorded Investment in Loans by Credit Quality Indicators (Details) Details http://www.ir.cbtn.com/role/LoansandAllowanceforCreditLossesACLTables 45 false false R46.htm 996021 - Disclosure - Loans and Allowance for Credit Losses (ACL) - Schedule of Company???s Nonaccrual Loans by Major Categories (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofCompanysNonaccrualLoansbyMajorCategoriesTable Loans and Allowance for Credit Losses (ACL) - Schedule of Company???s Nonaccrual Loans by Major Categories (Details) Details http://www.ir.cbtn.com/role/LoansandAllowanceforCreditLossesACLTables 46 false false R47.htm 996022 - Disclosure - Loans and Allowance for Credit Losses (ACL) - Schedule of Presents an Aging Analysis of Past Due Loans by Category (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofPresentsanAgingAnalysisofPastDueLoansbyCategoryTable Loans and Allowance for Credit Losses (ACL) - Schedule of Presents an Aging Analysis of Past Due Loans by Category (Details) Details http://www.ir.cbtn.com/role/LoansandAllowanceforCreditLossesACLTables 47 false false R48.htm 996023 - Disclosure - Loans and Allowance for Credit Losses (ACL) - Schedule of Provides a Collateral-Dependent Loans (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofProvidesaCollateralDependentLoansTable Loans and Allowance for Credit Losses (ACL) - Schedule of Provides a Collateral-Dependent Loans (Details) Details http://www.ir.cbtn.com/role/LoansandAllowanceforCreditLossesACLTables 48 false false R49.htm 996024 - Disclosure - Premises and Equipment (Details) Sheet http://www.ir.cbtn.com/role/PremisesandEquipmentDetails Premises and Equipment (Details) Details http://www.ir.cbtn.com/role/PremisesandEquipmentTables 49 false false R50.htm 996025 - Disclosure - Premises and Equipment - Schedule of Premises and Equipment (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofPremisesandEquipmentTable Premises and Equipment - Schedule of Premises and Equipment (Details) Details 50 false false R51.htm 996026 - Disclosure - Other Intangible Assets (Details) Sheet http://www.ir.cbtn.com/role/OtherIntangibleAssetsDetails Other Intangible Assets (Details) Details http://www.ir.cbtn.com/role/OtherIntangibleAssetsTables 51 false false R52.htm 996027 - Disclosure - Other Intangible Assets - Schedule of Accumulated Amortization of Core Deposit Intangibles (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofAccumulatedAmortizationofCoreDepositIntangiblesTable Other Intangible Assets - Schedule of Accumulated Amortization of Core Deposit Intangibles (Details) Details 52 false false R53.htm 996028 - Disclosure - Other Intangible Assets - Schedule of Change in Core Deposit Intangibles (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofChangeinCoreDepositIntangiblesTable Other Intangible Assets - Schedule of Change in Core Deposit Intangibles (Details) Details 53 false false R54.htm 996029 - Disclosure - Other Intangible Assets - Schedule of Estimated Amortization Expense of CDI (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofEstimatedAmortizationExpenseofCDITable Other Intangible Assets - Schedule of Estimated Amortization Expense of CDI (Details) Details 54 false false R55.htm 996030 - Disclosure - Short-Term Borrowings (Details) Sheet http://www.ir.cbtn.com/role/ShortTermBorrowingsDetails Short-Term Borrowings (Details) Details http://www.ir.cbtn.com/role/ShortTermBorrowingsTables 55 false false R56.htm 996031 - Disclosure - Short-Term Borrowings - Schedule of Short-Term Borrowings (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofShortTermBorrowingsTable Short-Term Borrowings - Schedule of Short-Term Borrowings (Details) Details 56 false false R57.htm 996032 - Disclosure - Long-Term Debt (Details) Sheet http://www.ir.cbtn.com/role/LongTermDebtDetails Long-Term Debt (Details) Details http://www.ir.cbtn.com/role/LongTermDebtTables 57 false false R58.htm 996033 - Disclosure - Long-Term Debt - Schedule of Components of FHLB Advances and Notes Payable (Details) Notes http://www.ir.cbtn.com/role/ScheduleofComponentsofFHLBAdvancesandNotesPayableTable Long-Term Debt - Schedule of Components of FHLB Advances and Notes Payable (Details) Details 58 false false R59.htm 996034 - Disclosure - Long-Term Debt - Schedule of Components of FHLB Advances and Notes Payable (Parentheticals) (Details) Notes http://www.ir.cbtn.com/role/ScheduleofComponentsofFHLBAdvancesandNotesPayableTable_Parentheticals Long-Term Debt - Schedule of Components of FHLB Advances and Notes Payable (Parentheticals) (Details) Details 59 false false R60.htm 996035 - Disclosure - Long-Term Debt - Schedule of Aggregate Annual Maturities of Long-Term Debt (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofAggregateAnnualMaturitiesofLongTermDebtTable Long-Term Debt - Schedule of Aggregate Annual Maturities of Long-Term Debt (Details) Details 60 false false R61.htm 996036 - Disclosure - Regulatory Matters (Details) Sheet http://www.ir.cbtn.com/role/RegulatoryMattersDetails Regulatory Matters (Details) Details http://www.ir.cbtn.com/role/RegulatoryMattersTables 61 false false R62.htm 996037 - Disclosure - Regulatory Matters - Schedule of Banks??? Actual Capital Amounts and Ratios (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofBanksActualCapitalAmountsandRatiosTable Regulatory Matters - Schedule of Banks??? Actual Capital Amounts and Ratios (Details) Details 62 false false R63.htm 996038 - Disclosure - Stock-Based Compensation (Details) Sheet http://www.ir.cbtn.com/role/StockBasedCompensationDetails Stock-Based Compensation (Details) Details http://www.ir.cbtn.com/role/StockBasedCompensationTables 63 false false R64.htm 996039 - Disclosure - Stock-Based Compensation - Schedule of Summarizes RSU Activity (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofSummarizesRSUActivityTable Stock-Based Compensation - Schedule of Summarizes RSU Activity (Details) Details 64 false false R65.htm 996040 - Disclosure - Disclosures About Fair Value of Assets and Liabilities - Schedule of Consolidated Balance Sheets Measured at Fair Value on Recurring Basis (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofConsolidatedBalanceSheetsMeasuredatFairValueonRecurringBasisTable Disclosures About Fair Value of Assets and Liabilities - Schedule of Consolidated Balance Sheets Measured at Fair Value on Recurring Basis (Details) Details 65 false false R66.htm 996041 - Disclosure - Disclosures About Fair Value of Assets and Liabilities - Schedule of Fair Value Measurements of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofFairValueMeasurementsofAssetsandLiabilitiesMeasuredatFairValueonNonrecurringBasisTable Disclosures About Fair Value of Assets and Liabilities - Schedule of Fair Value Measurements of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) Details 66 false false R67.htm 996042 - Disclosure - Disclosures About Fair Value of Assets and Liabilities - Schedule of Additional Quantitative Information About Assets Measured at Fair Value (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofAdditionalQuantitativeInformationAboutAssetsMeasuredatFairValueTable Disclosures About Fair Value of Assets and Liabilities - Schedule of Additional Quantitative Information About Assets Measured at Fair Value (Details) Details 67 false false R68.htm 996043 - Disclosure - Disclosures About Fair Value of Assets and Liabilities - Schedule of Estimated Fair Values of Financial Instruments (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofEstimatedFairValuesofFinancialInstrumentsTable Disclosures About Fair Value of Assets and Liabilities - Schedule of Estimated Fair Values of Financial Instruments (Details) Details 68 false false R69.htm 996044 - Disclosure - Significant Estimates and Concentrations (Details) Sheet http://www.ir.cbtn.com/role/SignificantEstimatesandConcentrationsDetails Significant Estimates and Concentrations (Details) Details http://www.ir.cbtn.com/role/SignificantEstimatesandConcentrations 69 false false R70.htm 996045 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.ir.cbtn.com/role/CommitmentsandContingenciesDetails Commitments and Contingencies (Details) Details http://www.ir.cbtn.com/role/CommitmentsandContingencies 70 false false R71.htm 996046 - Disclosure - Derivatives Not Designated as Hedges - Schedule of Derivative Positions Gross on the Consolidated Balance Sheets (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofDerivativePositionsGrossontheConsolidatedBalanceSheetsTable Derivatives Not Designated as Hedges - Schedule of Derivative Positions Gross on the Consolidated Balance Sheets (Details) Details 71 false false R72.htm 996047 - Disclosure - Earnings Per Share - Schedule of Earnings Per Share (Details) Sheet http://www.ir.cbtn.com/role/ScheduleofEarningsPerShareTable Earnings Per Share - Schedule of Earnings Per Share (Details) Details 72 false false All Reports Book All Reports cbk-20260331.xsd cbk-20260331_cal.xml cbk-20260331_def.xml cbk-20260331_lab.xml cbk-20260331_pre.xml ea0290365-10q_commercial.htm http://fasb.org/srt/2026 http://fasb.org/us-gaap/2026 http://xbrl.sec.gov/dei/2026 http://xbrl.sec.gov/ecd/2026 true true