3.20.4 html 384 656 1 true 108 0 false 12 false false R1.htm 0001001 - Document - Cover Page Sheet http://www.communitybank.tv/role/CoverPage Cover Page Cover 1 false false R2.htm 1001002 - Statement - Consolidated Statement of Financial Condition Sheet http://www.communitybank.tv/role/ConsolidatedStatementofFinancialCondition Consolidated Statement of Financial Condition Statements 2 false false R3.htm 1002003 - Statement - Consolidated Statement of Financial Condition (Parentheticals) Sheet http://www.communitybank.tv/role/ConsolidatedStatementofFinancialConditionParentheticals Consolidated Statement of Financial Condition (Parentheticals) Statements 3 false false R4.htm 1003004 - Statement - Consolidated Statement of Operations Sheet http://www.communitybank.tv/role/ConsolidatedStatementofOperations Consolidated Statement of Operations Statements 4 false false R5.htm 1004005 - Statement - Consolidated Statement of Comprehensive (Loss) Income Sheet http://www.communitybank.tv/role/ConsolidatedStatementofComprehensiveLossIncome Consolidated Statement of Comprehensive (Loss) Income Statements 5 false false R6.htm 1005006 - Statement - Consolidated Statement of Changes in Stockholders' Equity Sheet http://www.communitybank.tv/role/ConsolidatedStatementofChangesinStockholdersEquity Consolidated Statement of Changes in Stockholders' Equity Statements 6 false false R7.htm 1006007 - Statement - Consolidated Statement of Changes in Stockholders' Equity (Parentheticals) Sheet http://www.communitybank.tv/role/ConsolidatedStatementofChangesinStockholdersEquityParentheticals Consolidated Statement of Changes in Stockholders' Equity (Parentheticals) Statements 7 false false R8.htm 1007008 - Statement - Consolidated Statement of Cash Flows Sheet http://www.communitybank.tv/role/ConsolidatedStatementofCashFlows Consolidated Statement of Cash Flows Statements 8 false false R9.htm 1008009 - Statement - Consolidated Statement of Cash Flows (Parentheticals) Sheet http://www.communitybank.tv/role/ConsolidatedStatementofCashFlowsParentheticals Consolidated Statement of Cash Flows (Parentheticals) Statements 9 false false R10.htm 2101101 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.communitybank.tv/role/SummaryofSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 10 false false R11.htm 2104102 - Disclosure - (Loss) Earnings Per Share Sheet http://www.communitybank.tv/role/LossEarningsPerShare (Loss) Earnings Per Share Notes 11 false false R12.htm 2109103 - Disclosure - Securities Sheet http://www.communitybank.tv/role/Securities Securities Notes 12 false false R13.htm 2116104 - Disclosure - Loans and Related Allowance for Loan Losses Sheet http://www.communitybank.tv/role/LoansandRelatedAllowanceforLoanLosses Loans and Related Allowance for Loan Losses Notes 13 false false R14.htm 2129105 - Disclosure - Premises and Equipment Sheet http://www.communitybank.tv/role/PremisesandEquipment Premises and Equipment Notes 14 false false R15.htm 2133106 - Disclosure - Goodwill and Intangible Assets Sheet http://www.communitybank.tv/role/GoodwillandIntangibleAssets Goodwill and Intangible Assets Notes 15 false false R16.htm 2139107 - Disclosure - Deposits Sheet http://www.communitybank.tv/role/Deposits Deposits Notes 16 false false R17.htm 2143108 - Disclosure - Short-term Borrowings Sheet http://www.communitybank.tv/role/ShorttermBorrowings Short-term Borrowings Notes 17 false false R18.htm 2146109 - Disclosure - Other Borrowed Funds Sheet http://www.communitybank.tv/role/OtherBorrowedFunds Other Borrowed Funds Notes 18 false false R19.htm 2150110 - Disclosure - Income Taxes Sheet http://www.communitybank.tv/role/IncomeTaxes Income Taxes Notes 19 false false R20.htm 2156111 - Disclosure - Employee Benefits Sheet http://www.communitybank.tv/role/EmployeeBenefits Employee Benefits Notes 20 false false R21.htm 2162112 - Disclosure - Commitments and Contingent Liabilities Sheet http://www.communitybank.tv/role/CommitmentsandContingentLiabilities Commitments and Contingent Liabilities Notes 21 false false R22.htm 2166113 - Disclosure - Regulatory Capital Sheet http://www.communitybank.tv/role/RegulatoryCapital Regulatory Capital Notes 22 false false R23.htm 2169114 - Disclosure - Operating Leases Sheet http://www.communitybank.tv/role/OperatingLeases Operating Leases Notes 23 false false R24.htm 2173115 - Disclosure - Mortgage Servicing Rights Sheet http://www.communitybank.tv/role/MortgageServicingRights Mortgage Servicing Rights Notes 24 false false R25.htm 2176116 - Disclosure - Fair Value Disclosure Sheet http://www.communitybank.tv/role/FairValueDisclosure Fair Value Disclosure Notes 25 false false R26.htm 2182117 - Disclosure - Other Noninterest Expense Sheet http://www.communitybank.tv/role/OtherNoninterestExpense Other Noninterest Expense Notes 26 false false R27.htm 2185118 - Disclosure - Condensed Financial Statements of Parent Company Sheet http://www.communitybank.tv/role/CondensedFinancialStatementsofParentCompany Condensed Financial Statements of Parent Company Notes 27 false false R28.htm 2190119 - Disclosure - Segment Reporting and Related Information Sheet http://www.communitybank.tv/role/SegmentReportingandRelatedInformation Segment Reporting and Related Information Notes 28 false false R29.htm 2193120 - Disclosure - Quarterly Financial Information (Unaudited) Sheet http://www.communitybank.tv/role/QuarterlyFinancialInformationUnaudited Quarterly Financial Information (Unaudited) Notes 29 false false R30.htm 2202201 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.communitybank.tv/role/SummaryofSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.communitybank.tv/role/SummaryofSignificantAccountingPolicies 30 false false R31.htm 2305301 - Disclosure - (Loss) Earnings Per Share (Tables) Sheet http://www.communitybank.tv/role/LossEarningsPerShareTables (Loss) Earnings Per Share (Tables) Tables http://www.communitybank.tv/role/LossEarningsPerShare 31 false false R32.htm 2310302 - Disclosure - Securities (Tables) Sheet http://www.communitybank.tv/role/SecuritiesTables Securities (Tables) Tables http://www.communitybank.tv/role/Securities 32 false false R33.htm 2317303 - Disclosure - Loans and Related Allowance for Loan Losses (Tables) Sheet http://www.communitybank.tv/role/LoansandRelatedAllowanceforLoanLossesTables Loans and Related Allowance for Loan Losses (Tables) Tables http://www.communitybank.tv/role/LoansandRelatedAllowanceforLoanLosses 33 false false R34.htm 2330304 - Disclosure - Premises and Equipment (Tables) Sheet http://www.communitybank.tv/role/PremisesandEquipmentTables Premises and Equipment (Tables) Tables http://www.communitybank.tv/role/PremisesandEquipment 34 false false R35.htm 2334305 - Disclosure - Goodwill and Intangible Assets (Tables) Sheet http://www.communitybank.tv/role/GoodwillandIntangibleAssetsTables Goodwill and Intangible Assets (Tables) Tables http://www.communitybank.tv/role/GoodwillandIntangibleAssets 35 false false R36.htm 2340306 - Disclosure - Deposits (Tables) Sheet http://www.communitybank.tv/role/DepositsTables Deposits (Tables) Tables http://www.communitybank.tv/role/Deposits 36 false false R37.htm 2344307 - Disclosure - Short-term Borrowings (Tables) Sheet http://www.communitybank.tv/role/ShorttermBorrowingsTables Short-term Borrowings (Tables) Tables http://www.communitybank.tv/role/ShorttermBorrowings 37 false false R38.htm 2347308 - Disclosure - Other Borrowed Funds (Tables) Sheet http://www.communitybank.tv/role/OtherBorrowedFundsTables Other Borrowed Funds (Tables) Tables http://www.communitybank.tv/role/OtherBorrowedFunds 38 false false R39.htm 2351309 - Disclosure - Income Taxes (Tables) Sheet http://www.communitybank.tv/role/IncomeTaxesTables Income Taxes (Tables) Tables http://www.communitybank.tv/role/IncomeTaxes 39 false false R40.htm 2357310 - Disclosure - Employee Benefits (Tables) Sheet http://www.communitybank.tv/role/EmployeeBenefitsTables Employee Benefits (Tables) Tables http://www.communitybank.tv/role/EmployeeBenefits 40 false false R41.htm 2363311 - Disclosure - Commitments and Contingent Liabilities (Tables) Sheet http://www.communitybank.tv/role/CommitmentsandContingentLiabilitiesTables Commitments and Contingent Liabilities (Tables) Tables http://www.communitybank.tv/role/CommitmentsandContingentLiabilities 41 false false R42.htm 2367312 - Disclosure - Regulatory Capital (Tables) Sheet http://www.communitybank.tv/role/RegulatoryCapitalTables Regulatory Capital (Tables) Tables http://www.communitybank.tv/role/RegulatoryCapital 42 false false R43.htm 2370313 - Disclosure - Operating Leases (Tables) Sheet http://www.communitybank.tv/role/OperatingLeasesTables Operating Leases (Tables) Tables http://www.communitybank.tv/role/OperatingLeases 43 false false R44.htm 2374314 - Disclosure - Mortgage Servicing Rights (Tables) Sheet http://www.communitybank.tv/role/MortgageServicingRightsTables Mortgage Servicing Rights (Tables) Tables http://www.communitybank.tv/role/MortgageServicingRights 44 false false R45.htm 2377315 - Disclosure - Fair Value Disclosure (Tables) Sheet http://www.communitybank.tv/role/FairValueDisclosureTables Fair Value Disclosure (Tables) Tables http://www.communitybank.tv/role/FairValueDisclosure 45 false false R46.htm 2383316 - Disclosure - Other Noninterest Expense (Tables) Sheet http://www.communitybank.tv/role/OtherNoninterestExpenseTables Other Noninterest Expense (Tables) Tables http://www.communitybank.tv/role/OtherNoninterestExpense 46 false false R47.htm 2386317 - Disclosure - Condensed Financial Statements of Parent Company (Tables) Sheet http://www.communitybank.tv/role/CondensedFinancialStatementsofParentCompanyTables Condensed Financial Statements of Parent Company (Tables) Tables http://www.communitybank.tv/role/CondensedFinancialStatementsofParentCompany 47 false false R48.htm 2391318 - Disclosure - Segment Reporting and Related Information (Tables) Sheet http://www.communitybank.tv/role/SegmentReportingandRelatedInformationTables Segment Reporting and Related Information (Tables) Tables http://www.communitybank.tv/role/SegmentReportingandRelatedInformation 48 false false R49.htm 2394319 - Disclosure - Quarterly Financial Information (Unaudited) (Tables) Sheet http://www.communitybank.tv/role/QuarterlyFinancialInformationUnauditedTables Quarterly Financial Information (Unaudited) (Tables) Tables http://www.communitybank.tv/role/QuarterlyFinancialInformationUnaudited 49 false false R50.htm 2403401 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details) Sheet http://www.communitybank.tv/role/SummaryofSignificantAccountingPoliciesAdditionalInformationDetails Summary of Significant Accounting Policies - Additional Information (Details) Details 50 false false R51.htm 2406402 - Disclosure - (Loss) Earnings Per Share - Narrative (Details) Sheet http://www.communitybank.tv/role/LossEarningsPerShareNarrativeDetails (Loss) Earnings Per Share - Narrative (Details) Details 51 false false R52.htm 2407403 - Disclosure - (Loss) Earnings Per Share - Basic and Diluted Earnings Per Common Share (Details) Sheet http://www.communitybank.tv/role/LossEarningsPerShareBasicandDilutedEarningsPerCommonShareDetails (Loss) Earnings Per Share - Basic and Diluted Earnings Per Common Share (Details) Details 52 false false R53.htm 2408404 - Disclosure - (Loss) Earnings Per Share - Schedule of Computation of Diluted Earnings Per Share (Details) Sheet http://www.communitybank.tv/role/LossEarningsPerShareScheduleofComputationofDilutedEarningsPerShareDetails (Loss) Earnings Per Share - Schedule of Computation of Diluted Earnings Per Share (Details) Details 53 false false R54.htm 2411405 - Disclosure - Securities - Amortized Cost and Fair Value of Investment Securities Available-for-sale (Details) Sheet http://www.communitybank.tv/role/SecuritiesAmortizedCostandFairValueofInvestmentSecuritiesAvailableforsaleDetails Securities - Amortized Cost and Fair Value of Investment Securities Available-for-sale (Details) Details 54 false false R55.htm 2412406 - Disclosure - Securities - Gross Unrealized Losses and Fair Value by Investment Category and Continuous Unrealized Loss Position (Details) Sheet http://www.communitybank.tv/role/SecuritiesGrossUnrealizedLossesandFairValuebyInvestmentCategoryandContinuousUnrealizedLossPositionDetails Securities - Gross Unrealized Losses and Fair Value by Investment Category and Continuous Unrealized Loss Position (Details) Details 55 false false R56.htm 2413407 - Disclosure - Securities - Narrative (Details) Sheet http://www.communitybank.tv/role/SecuritiesNarrativeDetails Securities - Narrative (Details) Details 56 false false R57.htm 2414408 - Disclosure - Securities - Maturities of Investment Securities Available-for-sale and Held-to-maturity (Details) Sheet http://www.communitybank.tv/role/SecuritiesMaturitiesofInvestmentSecuritiesAvailableforsaleandHeldtomaturityDetails Securities - Maturities of Investment Securities Available-for-sale and Held-to-maturity (Details) Details 57 false false R58.htm 2415409 - Disclosure - Securities - Gains (Losses) of Sales of Available-for-sale Investment Securities (Details) Sheet http://www.communitybank.tv/role/SecuritiesGainsLossesofSalesofAvailableforsaleInvestmentSecuritiesDetails Securities - Gains (Losses) of Sales of Available-for-sale Investment Securities (Details) Details 58 false false R59.htm 2418410 - Disclosure - Loans and Related Allowance for Loan Losses - Composition of Loan Portfolio (Details) Sheet http://www.communitybank.tv/role/LoansandRelatedAllowanceforLoanLossesCompositionofLoanPortfolioDetails Loans and Related Allowance for Loan Losses - Composition of Loan Portfolio (Details) Details 59 false false R60.htm 2419411 - Disclosure - Loans and Related Allowance for Loan Losses - Narrative (Details) Sheet http://www.communitybank.tv/role/LoansandRelatedAllowanceforLoanLossesNarrativeDetails Loans and Related Allowance for Loan Losses - Narrative (Details) Details 60 false false R61.htm 2420412 - Disclosure - Loans and Related Allowance for Loan Losses - Credit Quality Information (Details) Sheet http://www.communitybank.tv/role/LoansandRelatedAllowanceforLoanLossesCreditQualityInformationDetails Loans and Related Allowance for Loan Losses - Credit Quality Information (Details) Details 61 false false R62.htm 2421413 - Disclosure - Loans and Related Allowance for Loan Losses - Loans by Aging Categories (Details) Sheet http://www.communitybank.tv/role/LoansandRelatedAllowanceforLoanLossesLoansbyAgingCategoriesDetails Loans and Related Allowance for Loan Losses - Loans by Aging Categories (Details) Details 62 false false R63.htm 2422414 - Disclosure - Loans and Related Allowance for Loan Losses - Impaired Loans (Details) Sheet http://www.communitybank.tv/role/LoansandRelatedAllowanceforLoanLossesImpairedLoansDetails Loans and Related Allowance for Loan Losses - Impaired Loans (Details) Details 63 false false R64.htm 2423415 - Disclosure - Loans and Related Allowance for Loan Losses - Loans in Forbearance (Details) Sheet http://www.communitybank.tv/role/LoansandRelatedAllowanceforLoanLossesLoansinForbearanceDetails Loans and Related Allowance for Loan Losses - Loans in Forbearance (Details) Details 64 false false R65.htm 2424416 - Disclosure - Loans and Related Allowance for Loan Losses - Loans Classified as TDRs (Details) Sheet http://www.communitybank.tv/role/LoansandRelatedAllowanceforLoanLossesLoansClassifiedasTDRsDetails Loans and Related Allowance for Loan Losses - Loans Classified as TDRs (Details) Details 65 false false R66.htm 2425417 - Disclosure - Loans and Related Allowance for Loan Losses - Activity in the Allowance for Loan Losses (Details) Sheet http://www.communitybank.tv/role/LoansandRelatedAllowanceforLoanLossesActivityintheAllowanceforLoanLossesDetails Loans and Related Allowance for Loan Losses - Activity in the Allowance for Loan Losses (Details) Details 66 false false R67.htm 2426418 - Disclosure - Loans and Related Allowance for Loan Losses - Loans Summarized by Individually Evaluated for Impairment and Collectively Evaluated for Potential Losses (Details) Sheet http://www.communitybank.tv/role/LoansandRelatedAllowanceforLoanLossesLoansSummarizedbyIndividuallyEvaluatedforImpairmentandCollectivelyEvaluatedforPotentialLossesDetails Loans and Related Allowance for Loan Losses - Loans Summarized by Individually Evaluated for Impairment and Collectively Evaluated for Potential Losses (Details) Details 67 false false R68.htm 2427419 - Disclosure - Loans and Related Allowance for Loan Losses - Accretable Discount on Loans Acquired at Fair Value (Details) Sheet http://www.communitybank.tv/role/LoansandRelatedAllowanceforLoanLossesAccretableDiscountonLoansAcquiredatFairValueDetails Loans and Related Allowance for Loan Losses - Accretable Discount on Loans Acquired at Fair Value (Details) Details 68 false false R69.htm 2428420 - Disclosure - Loans and Related Allowance for Loan Losses - Related Party Loans (Details) Sheet http://www.communitybank.tv/role/LoansandRelatedAllowanceforLoanLossesRelatedPartyLoansDetails Loans and Related Allowance for Loan Losses - Related Party Loans (Details) Details 69 false false R70.htm 2431421 - Disclosure - Premises and Equipment - Classifications of Premises and Equipment (Details) Sheet http://www.communitybank.tv/role/PremisesandEquipmentClassificationsofPremisesandEquipmentDetails Premises and Equipment - Classifications of Premises and Equipment (Details) Details 70 false false R71.htm 2432422 - Disclosure - Premises and Equipment - Narrative (Details) Sheet http://www.communitybank.tv/role/PremisesandEquipmentNarrativeDetails Premises and Equipment - Narrative (Details) Details 71 false false R72.htm 2435423 - Disclosure - Goodwill and Intangible Assets - Additional Information (Details) Sheet http://www.communitybank.tv/role/GoodwillandIntangibleAssetsAdditionalInformationDetails Goodwill and Intangible Assets - Additional Information (Details) Details 72 false false R73.htm 2436424 - Disclosure - Goodwill and Intangible Assets - Goodwill Roll-forward (Details) Sheet http://www.communitybank.tv/role/GoodwillandIntangibleAssetsGoodwillRollforwardDetails Goodwill and Intangible Assets - Goodwill Roll-forward (Details) Details 73 false false R74.htm 2437425 - Disclosure - Goodwill and Intangible Assets - Summary of Intangible Assets Subject to Amortization (Details) Sheet http://www.communitybank.tv/role/GoodwillandIntangibleAssetsSummaryofIntangibleAssetsSubjecttoAmortizationDetails Goodwill and Intangible Assets - Summary of Intangible Assets Subject to Amortization (Details) Details 74 false false R75.htm 2438426 - Disclosure - Goodwill and Intangible Assets - Future Amortization (Details) Sheet http://www.communitybank.tv/role/GoodwillandIntangibleAssetsFutureAmortizationDetails Goodwill and Intangible Assets - Future Amortization (Details) Details 75 false false R76.htm 2441427 - Disclosure - Deposits - Maturities of Time Deposits (Details) Sheet http://www.communitybank.tv/role/DepositsMaturitiesofTimeDepositsDetails Deposits - Maturities of Time Deposits (Details) Details 76 false false R77.htm 2442428 - Disclosure - Deposits - Narrative (Details) Sheet http://www.communitybank.tv/role/DepositsNarrativeDetails Deposits - Narrative (Details) Details 77 false false R78.htm 2445429 - Disclosure - Short-term Borrowings - Federal Funds Purchased and Short-term Borrowings (Details) Sheet http://www.communitybank.tv/role/ShorttermBorrowingsFederalFundsPurchasedandShorttermBorrowingsDetails Short-term Borrowings - Federal Funds Purchased and Short-term Borrowings (Details) Details 78 false false R79.htm 2448430 - Disclosure - Other Borrowed Funds - Federal Home Loan Bank Advances (Details) Sheet http://www.communitybank.tv/role/OtherBorrowedFundsFederalHomeLoanBankAdvancesDetails Other Borrowed Funds - Federal Home Loan Bank Advances (Details) Details 79 false false R80.htm 2449431 - Disclosure - Other Borrowed Funds - Narrative (Details) Sheet http://www.communitybank.tv/role/OtherBorrowedFundsNarrativeDetails Other Borrowed Funds - Narrative (Details) Details 80 false false R81.htm 2452432 - Disclosure - Income Taxes - Provision for Income Taxes (Details) Sheet http://www.communitybank.tv/role/IncomeTaxesProvisionforIncomeTaxesDetails Income Taxes - Provision for Income Taxes (Details) Details 81 false false R82.htm 2453433 - Disclosure - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) Sheet http://www.communitybank.tv/role/IncomeTaxesSummaryofDeferredTaxAssetsandLiabilitiesDetails Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) Details 82 false false R83.htm 2454434 - Disclosure - Income Taxes - Narrative (Details) Sheet http://www.communitybank.tv/role/IncomeTaxesNarrativeDetails Income Taxes - Narrative (Details) Details 83 false false R84.htm 2455435 - Disclosure - Income Taxes - Federal Income Tax Reconciliation (Details) Sheet http://www.communitybank.tv/role/IncomeTaxesFederalIncomeTaxReconciliationDetails Income Taxes - Federal Income Tax Reconciliation (Details) Details 84 false false R85.htm 2458436 - Disclosure - Employee Benefits - Narrative (Details) Sheet http://www.communitybank.tv/role/EmployeeBenefitsNarrativeDetails Employee Benefits - Narrative (Details) Details 85 false false R86.htm 2459437 - Disclosure - Employee Benefits - Restricted Stock Awards and Stock Option Grant (Details) Sheet http://www.communitybank.tv/role/EmployeeBenefitsRestrictedStockAwardsandStockOptionGrantDetails Employee Benefits - Restricted Stock Awards and Stock Option Grant (Details) Details 86 false false R87.htm 2460438 - Disclosure - Employee Benefits - Stock Option Plan Activity (Details) Sheet http://www.communitybank.tv/role/EmployeeBenefitsStockOptionPlanActivityDetails Employee Benefits - Stock Option Plan Activity (Details) Details 87 false false R88.htm 2461439 - Disclosure - Employee Benefits - Restricted Stock Award Activity (Details) Sheet http://www.communitybank.tv/role/EmployeeBenefitsRestrictedStockAwardActivityDetails Employee Benefits - Restricted Stock Award Activity (Details) Details 88 false false R89.htm 2464440 - Disclosure - Commitments and Contingent Liabilities - Unused and Available Credit Balances of Financial Instruments (Details) Sheet http://www.communitybank.tv/role/CommitmentsandContingentLiabilitiesUnusedandAvailableCreditBalancesofFinancialInstrumentsDetails Commitments and Contingent Liabilities - Unused and Available Credit Balances of Financial Instruments (Details) Details 89 false false R90.htm 2465441 - Disclosure - Commitments and Contingent Liabilities - Narrative (Details) Sheet http://www.communitybank.tv/role/CommitmentsandContingentLiabilitiesNarrativeDetails Commitments and Contingent Liabilities - Narrative (Details) Details 90 false false R91.htm 2468442 - Disclosure - Regulatory Capital - Summary of Capital Ratios (Details) Sheet http://www.communitybank.tv/role/RegulatoryCapitalSummaryofCapitalRatiosDetails Regulatory Capital - Summary of Capital Ratios (Details) Details 91 false false R92.htm 2471443 - Disclosure - Operating Leases - Operating Leases (Details) Sheet http://www.communitybank.tv/role/OperatingLeasesOperatingLeasesDetails Operating Leases - Operating Leases (Details) Details 92 false false R93.htm 2472444 - Disclosure - Operating Leases - Maturity of Operating Lease (Details) Sheet http://www.communitybank.tv/role/OperatingLeasesMaturityofOperatingLeaseDetails Operating Leases - Maturity of Operating Lease (Details) Details 93 false false R94.htm 2475445 - Disclosure - Mortgage Servicing Rights (Details) Sheet http://www.communitybank.tv/role/MortgageServicingRightsDetails Mortgage Servicing Rights (Details) Details http://www.communitybank.tv/role/MortgageServicingRightsTables 94 false false R95.htm 2478446 - Disclosure - Fair Value Disclosure - Assets and Liabilities Reported Fair Value (Details) Sheet http://www.communitybank.tv/role/FairValueDisclosureAssetsandLiabilitiesReportedFairValueDetails Fair Value Disclosure - Assets and Liabilities Reported Fair Value (Details) Details 95 false false R96.htm 2479447 - Disclosure - Fair Value Disclosure - Significant Unobservable Inputs Used in the Fair Value Measurements (Details) Sheet http://www.communitybank.tv/role/FairValueDisclosureSignificantUnobservableInputsUsedintheFairValueMeasurementsDetails Fair Value Disclosure - Significant Unobservable Inputs Used in the Fair Value Measurements (Details) Details 96 false false R97.htm 2480448 - Disclosure - Fair Value Disclosure - Narrative (Details) Sheet http://www.communitybank.tv/role/FairValueDisclosureNarrativeDetails Fair Value Disclosure - Narrative (Details) Details 97 false false R98.htm 2481449 - Disclosure - Fair Value Disclosure - Estimated Fair Value of the Company's Financial Instruments (Details) Sheet http://www.communitybank.tv/role/FairValueDisclosureEstimatedFairValueoftheCompanysFinancialInstrumentsDetails Fair Value Disclosure - Estimated Fair Value of the Company's Financial Instruments (Details) Details 98 false false R99.htm 2484450 - Disclosure - Other Noninterest Expense - Components of Other Noninterest Expense (Details) Sheet http://www.communitybank.tv/role/OtherNoninterestExpenseComponentsofOtherNoninterestExpenseDetails Other Noninterest Expense - Components of Other Noninterest Expense (Details) Details 99 false false R100.htm 2487451 - Disclosure - Condensed Financial Statements of Parent Company - Statement of Financial Condition (Details) Sheet http://www.communitybank.tv/role/CondensedFinancialStatementsofParentCompanyStatementofFinancialConditionDetails Condensed Financial Statements of Parent Company - Statement of Financial Condition (Details) Details 100 false false R101.htm 2488452 - Disclosure - Condensed Financial Statements of Parent Company - Statement of Income (Details) Sheet http://www.communitybank.tv/role/CondensedFinancialStatementsofParentCompanyStatementofIncomeDetails Condensed Financial Statements of Parent Company - Statement of Income (Details) Details 101 false false R102.htm 2489453 - Disclosure - Condensed Financial Statements of Parent Company - Statement of Cash Flows (Details) Sheet http://www.communitybank.tv/role/CondensedFinancialStatementsofParentCompanyStatementofCashFlowsDetails Condensed Financial Statements of Parent Company - Statement of Cash Flows (Details) Details 102 false false R103.htm 2492454 - Disclosure - Segment Reporting and Related Information (Details) Sheet http://www.communitybank.tv/role/SegmentReportingandRelatedInformationDetails Segment Reporting and Related Information (Details) Details http://www.communitybank.tv/role/SegmentReportingandRelatedInformationTables 103 false false R104.htm 2495455 - Disclosure - Quarterly Financial Information (Unaudited) - Results of Operations (Details) Sheet http://www.communitybank.tv/role/QuarterlyFinancialInformationUnauditedResultsofOperationsDetails Quarterly Financial Information (Unaudited) - Results of Operations (Details) Details http://www.communitybank.tv/role/QuarterlyFinancialInformationUnauditedTables 104 false false All Reports Book All Reports cbfv-20201231.htm cbfv-20201231.xsd cbfv-20201231_cal.xml cbfv-20201231_def.xml cbfv-20201231_lab.xml cbfv-20201231_pre.xml cbfv-20201231xex21subsidia.htm cbfv-20201231xex23consent.htm cbfv-20201231xex311ceocert.htm cbfv-20201231xex312cfocert.htm cbfv-20201231xex321ceoandc.htm cbfv-20201231xex42descript.htm cbfv-20201231_g1.jpg http://fasb.org/srt/2020-01-31 http://fasb.org/us-gaap/2020-01-31 http://xbrl.sec.gov/stpr/2018-01-31 http://xbrl.sec.gov/dei/2020-01-31 true true