3.22.0.1 html 742 784 1 false 173 0 false 7 false false R1.htm 00090 - Document - Document and Entity Information Sheet http://www.bhbt.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 00100 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://www.bhbt.com/role/StatementConsolidatedBalanceSheets CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 00105 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://www.bhbt.com/role/StatementConsolidatedBalanceSheetsParenthetical CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 3 false false R4.htm 00200 - Statement - CONSOLIDATED STATEMENTS OF INCOME Sheet http://www.bhbt.com/role/StatementConsolidatedStatementsOfIncome CONSOLIDATED STATEMENTS OF INCOME Statements 4 false false R5.htm 00300 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://www.bhbt.com/role/StatementConsolidatedStatementsOfComprehensiveIncome CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 5 false false R6.htm 00400 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY Sheet http://www.bhbt.com/role/StatementConsolidatedStatementsOfChangesInShareholdersEquity CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY Statements 6 false false R7.htm 00405 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) Sheet http://www.bhbt.com/role/StatementConsolidatedStatementsOfChangesInShareholdersEquityParenthetical CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) Statements 7 false false R8.htm 00500 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.bhbt.com/role/StatementConsolidatedStatementsOfCashFlows CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 8 false false R9.htm 10101 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Sheet http://www.bhbt.com/role/DisclosureSummaryOfSignificantAccountingPolicies SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Notes 9 false false R10.htm 10201 - Disclosure - SECURITIES AVAILABLE FOR SALE Sheet http://www.bhbt.com/role/DisclosureSecuritiesAvailableForSale SECURITIES AVAILABLE FOR SALE Notes 10 false false R11.htm 10301 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES Sheet http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLosses LOANS AND ALLOWANCE FOR CREDIT LOSSES Notes 11 false false R12.htm 10401 - Disclosure - PREMISES AND EQUIPMENT Sheet http://www.bhbt.com/role/DisclosurePremisesAndEquipment PREMISES AND EQUIPMENT Notes 12 false false R13.htm 10501 - Disclosure - GOODWILL AND OTHER INTANGIBLES Sheet http://www.bhbt.com/role/DisclosureGoodwillAndOtherIntangibles GOODWILL AND OTHER INTANGIBLES Notes 13 false false R14.htm 10601 - Disclosure - DEPOSITS Sheet http://www.bhbt.com/role/DisclosureDeposits DEPOSITS Notes 14 false false R15.htm 10701 - Disclosure - BORROWED FUNDS Sheet http://www.bhbt.com/role/DisclosureBorrowedFunds BORROWED FUNDS Notes 15 false false R16.htm 10801 - Disclosure - EMPLOYEE BENEFIT PLANS Sheet http://www.bhbt.com/role/DisclosureEmployeeBenefitPlans EMPLOYEE BENEFIT PLANS Notes 16 false false R17.htm 10901 - Disclosure - INCOME TAXES Sheet http://www.bhbt.com/role/DisclosureIncomeTaxes INCOME TAXES Notes 17 false false R18.htm 11001 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES Sheet http://www.bhbt.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivities DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES Notes 18 false false R19.htm 11101 - Disclosure - OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES Sheet http://www.bhbt.com/role/DisclosureOtherCommitmentsContingenciesAndOffBalanceSheetActivities OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES Notes 19 false false R20.htm 11201 - Disclosure - SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE Sheet http://www.bhbt.com/role/DisclosureShareholdersEquityAndEarningsPerCommonShare SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE Notes 20 false false R21.htm 11301 - Disclosure - STOCK-BASED COMPENSATION PLANS Sheet http://www.bhbt.com/role/DisclosureStockBasedCompensationPlans STOCK-BASED COMPENSATION PLANS Notes 21 false false R22.htm 11401 - Disclosure - FAIR VALUE MEASUREMENTS Sheet http://www.bhbt.com/role/DisclosureFairValueMeasurements FAIR VALUE MEASUREMENTS Notes 22 false false R23.htm 11501 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS Sheet http://www.bhbt.com/role/DisclosureRevenueFromContractsWithCustomers REVENUE FROM CONTRACTS WITH CUSTOMERS Notes 23 false false R24.htm 11601 - Disclosure - LEASES Sheet http://www.bhbt.com/role/DisclosureLeases LEASES Notes 24 false false R25.htm 11701 - Disclosure - CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY Sheet http://www.bhbt.com/role/DisclosureCondensedFinancialStatementsOfParentCompany CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY Notes 25 false false R26.htm 11801 - Disclosure - QUARTERLY DATA (UNAUDITED) Sheet http://www.bhbt.com/role/DisclosureQuarterlyDataUnaudited QUARTERLY DATA (UNAUDITED) Notes 26 false false R27.htm 11901 - Disclosure - SUBSEQUENT EVENTS Sheet http://www.bhbt.com/role/DisclosureSubsequentEvents SUBSEQUENT EVENTS Notes 27 false false R28.htm 20102 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) Sheet http://www.bhbt.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) Policies 28 false false R29.htm 30103 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) Sheet http://www.bhbt.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) Tables http://www.bhbt.com/role/DisclosureSummaryOfSignificantAccountingPolicies 29 false false R30.htm 30203 - Disclosure - SECURITIES AVAILABLE FOR SALE (Tables) Sheet http://www.bhbt.com/role/DisclosureSecuritiesAvailableForSaleTables SECURITIES AVAILABLE FOR SALE (Tables) Tables http://www.bhbt.com/role/DisclosureSecuritiesAvailableForSale 30 false false R31.htm 30303 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES (Tables) Sheet http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLossesTables LOANS AND ALLOWANCE FOR CREDIT LOSSES (Tables) Tables http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLosses 31 false false R32.htm 30403 - Disclosure - PREMISES AND EQUIPMENT (Tables) Sheet http://www.bhbt.com/role/DisclosurePremisesAndEquipmentTables PREMISES AND EQUIPMENT (Tables) Tables http://www.bhbt.com/role/DisclosurePremisesAndEquipment 32 false false R33.htm 30503 - Disclosure - GOODWILL AND OTHER INTANGIBLES (Tables) Sheet http://www.bhbt.com/role/DisclosureGoodwillAndOtherIntangiblesTables GOODWILL AND OTHER INTANGIBLES (Tables) Tables http://www.bhbt.com/role/DisclosureGoodwillAndOtherIntangibles 33 false false R34.htm 30603 - Disclosure - DEPOSITS (Tables) Sheet http://www.bhbt.com/role/DisclosureDepositsTables DEPOSITS (Tables) Tables http://www.bhbt.com/role/DisclosureDeposits 34 false false R35.htm 30703 - Disclosure - BORROWED FUNDS (Tables) Sheet http://www.bhbt.com/role/DisclosureBorrowedFundsTables BORROWED FUNDS (Tables) Tables http://www.bhbt.com/role/DisclosureBorrowedFunds 35 false false R36.htm 30803 - Disclosure - EMPLOYEE BENEFIT PLANS (Tables) Sheet http://www.bhbt.com/role/DisclosureEmployeeBenefitPlansTables EMPLOYEE BENEFIT PLANS (Tables) Tables http://www.bhbt.com/role/DisclosureEmployeeBenefitPlans 36 false false R37.htm 30903 - Disclosure - INCOME TAXES (Tables) Sheet http://www.bhbt.com/role/DisclosureIncomeTaxesTables INCOME TAXES (Tables) Tables http://www.bhbt.com/role/DisclosureIncomeTaxes 37 false false R38.htm 31003 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Tables) Sheet http://www.bhbt.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesTables DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Tables) Tables http://www.bhbt.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivities 38 false false R39.htm 31103 - Disclosure - OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES (Tables) Sheet http://www.bhbt.com/role/DisclosureOtherCommitmentsContingenciesAndOffBalanceSheetActivitiesTables OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES (Tables) Tables http://www.bhbt.com/role/DisclosureOtherCommitmentsContingenciesAndOffBalanceSheetActivities 39 false false R40.htm 31203 - Disclosure - SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE (Tables) Sheet http://www.bhbt.com/role/DisclosureShareholdersEquityAndEarningsPerCommonShareTables SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE (Tables) Tables http://www.bhbt.com/role/DisclosureShareholdersEquityAndEarningsPerCommonShare 40 false false R41.htm 31303 - Disclosure - STOCK-BASED COMPENSATION PLANS (Tables) Sheet http://www.bhbt.com/role/DisclosureStockBasedCompensationPlansTables STOCK-BASED COMPENSATION PLANS (Tables) Tables http://www.bhbt.com/role/DisclosureStockBasedCompensationPlans 41 false false R42.htm 31403 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) Sheet http://www.bhbt.com/role/DisclosureFairValueMeasurementsTables FAIR VALUE MEASUREMENTS (Tables) Tables http://www.bhbt.com/role/DisclosureFairValueMeasurements 42 false false R43.htm 31503 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) Sheet http://www.bhbt.com/role/DisclosureRevenueFromContractsWithCustomersTables REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) Tables http://www.bhbt.com/role/DisclosureRevenueFromContractsWithCustomers 43 false false R44.htm 31603 - Disclosure - LEASES (Tables) Sheet http://www.bhbt.com/role/DisclosureLeasesTables LEASES (Tables) Tables http://www.bhbt.com/role/DisclosureLeases 44 false false R45.htm 31703 - Disclosure - CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY (Tables) Sheet http://www.bhbt.com/role/DisclosureCondensedFinancialStatementsOfParentCompanyTables CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY (Tables) Tables http://www.bhbt.com/role/DisclosureCondensedFinancialStatementsOfParentCompany 45 false false R46.htm 31803 - Disclosure - QUARTERLY DATA (UNAUDITED) (Tables) Sheet http://www.bhbt.com/role/DisclosureQuarterlyDataUnauditedTables QUARTERLY DATA (UNAUDITED) (Tables) Tables http://www.bhbt.com/role/DisclosureQuarterlyDataUnaudited 46 false false R47.htm 40101 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) Sheet http://www.bhbt.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) Details http://www.bhbt.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables 47 false false R48.htm 40102 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Adoption (Details) Sheet http://www.bhbt.com/role/DisclosureSummaryOfSignificantAccountingPoliciesImpactOfAdoptionDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Adoption (Details) Details 48 false false R49.htm 40103 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Adoption - Balance sheet (Details) Sheet http://www.bhbt.com/role/DisclosureSummaryOfSignificantAccountingPoliciesImpactOfAdoptionBalanceSheetDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Adoption - Balance sheet (Details) Details 49 false false R50.htm 40104 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Adaption on comprehensive income (Details) Sheet http://www.bhbt.com/role/DisclosureSummaryOfSignificantAccountingPoliciesImpactOfAdaptionOnComprehensiveIncomeDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Adaption on comprehensive income (Details) Details 50 false false R51.htm 40105 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Adoption on Stockholders equity (Details) Sheet http://www.bhbt.com/role/DisclosureSummaryOfSignificantAccountingPoliciesImpactOfAdoptionOnStockholdersEquityDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Adoption on Stockholders equity (Details) Details 51 false false R52.htm 40201 - Disclosure - SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) Sheet http://www.bhbt.com/role/DisclosureSecuritiesAvailableForSaleSummaryOfSecuritiesAvailableForSaleDetails SECURITIES AVAILABLE FOR SALE - Summary of Securities Available for Sale (Details) Details 52 false false R53.htm 40202 - Disclosure - SECURITIES AVAILABLE FOR SALE - Maturity of Available for Sale Securities (Details) Sheet http://www.bhbt.com/role/DisclosureSecuritiesAvailableForSaleMaturityOfAvailableForSaleSecuritiesDetails SECURITIES AVAILABLE FOR SALE - Maturity of Available for Sale Securities (Details) Details 53 false false R54.htm 40203 - Disclosure - SECURITIES AVAILABLE FOR SALE - Proceeds from the Sale of Securities and Realized Gains and Losses (Details) Sheet http://www.bhbt.com/role/DisclosureSecuritiesAvailableForSaleProceedsFromSaleOfSecuritiesAndRealizedGainsAndLossesDetails SECURITIES AVAILABLE FOR SALE - Proceeds from the Sale of Securities and Realized Gains and Losses (Details) Details 54 false false R55.htm 40204 - Disclosure - SECURITIES AVAILABLE FOR SALE - Summary of Securities with Unrealized Losses (Details) Sheet http://www.bhbt.com/role/DisclosureSecuritiesAvailableForSaleSummaryOfSecuritiesWithUnrealizedLossesDetails SECURITIES AVAILABLE FOR SALE - Summary of Securities with Unrealized Losses (Details) Details 55 false false R56.htm 40205 - Disclosure - SECURITIES AVAILABLE FOR SALE - Securities Pledged for Collateral (Details) Sheet http://www.bhbt.com/role/DisclosureSecuritiesAvailableForSaleSecuritiesPledgedForCollateralDetails SECURITIES AVAILABLE FOR SALE - Securities Pledged for Collateral (Details) Details 56 false false R57.htm 40207 - Disclosure - SECURITIES AVAILABLE FOR SALE - Basis for Impairment Conclusion (Details) Sheet http://www.bhbt.com/role/DisclosureSecuritiesAvailableForSaleBasisForImpairmentConclusionDetails SECURITIES AVAILABLE FOR SALE - Basis for Impairment Conclusion (Details) Details 57 false false R58.htm 40301 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Total Loans (Details) Sheet http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLossesSummaryOfTotalLoansDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Total Loans (Details) Details 58 false false R59.htm 40302 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Unamortized Net Costs and Premiums (Details) Sheet http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLossesUnamortizedNetCostsAndPremiumsDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Unamortized Net Costs and Premiums (Details) Details 59 false false R60.htm 40303 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance Activity (Details) Sheet http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLossesAllowanceActivityDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance Activity (Details) Details 60 false false R61.htm 40304 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans by Credit Risk Rating (Details) Sheet http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLossesLoansByCreditRiskRatingDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans by Credit Risk Rating (Details) Details 61 false false R62.htm 40305 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Past Due Loans (Details) Sheet http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLossesSummaryOfPastDueLoansDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Past Due Loans (Details) Details 62 false false R63.htm 40306 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non-accrual Loans (Details) Sheet http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLossesNonAccrualLoansDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Non-accrual Loans (Details) Details 63 false false R64.htm 40307 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Evaluated for Impairment (Details) Sheet http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLossesLoansEvaluatedForImpairmentDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Evaluated for Impairment (Details) Details 64 false false R65.htm 40308 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details) Sheet http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLossesImpairedLoansDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details) Details 65 false false R66.htm 40309 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - TDR, Recorded Investment and Number of Modifications (Details) Sheet http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLossesTdrRecordedInvestmentAndNumberOfModificationsDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - TDR, Recorded Investment and Number of Modifications (Details) Details 66 false false R67.htm 40310 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Concentrations (Details) Sheet http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLossesConcentrationsDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Concentrations (Details) Details 67 false false R68.htm 40311 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans to Related Parties (Details) Sheet http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLossesLoansToRelatedPartiesDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans to Related Parties (Details) Details 68 false false R69.htm 40312 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Mortgage Banking (Details) Sheet http://www.bhbt.com/role/DisclosureLoansAndAllowanceForCreditLossesMortgageBankingDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Mortgage Banking (Details) Details 69 false false R70.htm 40401 - Disclosure - PREMISES AND EQUIPMENT (Details) Sheet http://www.bhbt.com/role/DisclosurePremisesAndEquipmentDetails PREMISES AND EQUIPMENT (Details) Details http://www.bhbt.com/role/DisclosurePremisesAndEquipmentTables 70 false false R71.htm 40501 - Disclosure - GOODWILL AND OTHER INTANGIBLES - Goodwill (Details) Sheet http://www.bhbt.com/role/DisclosureGoodwillAndOtherIntangiblesGoodwillDetails GOODWILL AND OTHER INTANGIBLES - Goodwill (Details) Details 71 false false R72.htm 40502 - Disclosure - GOODWILL AND OTHER INTANGIBLES - Intangible Assets (Details) Sheet http://www.bhbt.com/role/DisclosureGoodwillAndOtherIntangiblesIntangibleAssetsDetails GOODWILL AND OTHER INTANGIBLES - Intangible Assets (Details) Details 72 false false R73.htm 40601 - Disclosure - DEPOSITS - Components (Details) Sheet http://www.bhbt.com/role/DisclosureDepositsComponentsDetails DEPOSITS - Components (Details) Details 73 false false R74.htm 40602 - Disclosure - DEPOSITS - Maturities, Brokered, Reciprocal (Details) Sheet http://www.bhbt.com/role/DisclosureDepositsMaturitiesBrokeredReciprocalDetails DEPOSITS - Maturities, Brokered, Reciprocal (Details) Details 74 false false R75.htm 40701 - Disclosure - BORROWED FUNDS - Summary of Borrowed Funds (Details) Sheet http://www.bhbt.com/role/DisclosureBorrowedFundsSummaryOfBorrowedFundsDetails BORROWED FUNDS - Summary of Borrowed Funds (Details) Details 75 false false R76.htm 40702 - Disclosure - BORROWED FUNDS - Additional Information (Details) Sheet http://www.bhbt.com/role/DisclosureBorrowedFundsAdditionalInformationDetails BORROWED FUNDS - Additional Information (Details) Details 76 false false R77.htm 40703 - Disclosure - BORROWED FUNDS - Maturities of FHLB Advances (Details) Sheet http://www.bhbt.com/role/DisclosureBorrowedFundsMaturitiesOfFhlbAdvancesDetails BORROWED FUNDS - Maturities of FHLB Advances (Details) Details 77 false false R78.htm 40704 - Disclosure - BORROWED FUNDS - Subordinated and Junior Subordinated Borrowings (Details) Sheet http://www.bhbt.com/role/DisclosureBorrowedFundsSubordinatedAndJuniorSubordinatedBorrowingsDetails BORROWED FUNDS - Subordinated and Junior Subordinated Borrowings (Details) Details 78 false false R79.htm 40705 - Disclosure - BORROWED FUNDS - Repurchase Agreements (Details) Sheet http://www.bhbt.com/role/DisclosureBorrowedFundsRepurchaseAgreementsDetails BORROWED FUNDS - Repurchase Agreements (Details) Details 79 false false R80.htm 40801 - Disclosure - EMPLOYEE BENEFIT PLANS - Information about the plan (Details) Sheet http://www.bhbt.com/role/DisclosureEmployeeBenefitPlansInformationAboutPlanDetails EMPLOYEE BENEFIT PLANS - Information about the plan (Details) Details 80 false false R81.htm 40802 - Disclosure - EMPLOYEE BENEFIT PLANS - Schedule of Net Benefit Costs (Details) Sheet http://www.bhbt.com/role/DisclosureEmployeeBenefitPlansScheduleOfNetBenefitCostsDetails EMPLOYEE BENEFIT PLANS - Schedule of Net Benefit Costs (Details) Details 81 false false R82.htm 40803 - Disclosure - EMPLOYEE BENEFIT PLANS - Amounts Recognized in Other Comprehensive Income (Loss) (Details) Sheet http://www.bhbt.com/role/DisclosureEmployeeBenefitPlansAmountsRecognizedInOtherComprehensiveIncomeLossDetails EMPLOYEE BENEFIT PLANS - Amounts Recognized in Other Comprehensive Income (Loss) (Details) Details 82 false false R83.htm 40804 - Disclosure - EMPLOYEE BENEFIT PLANS - Assumptions (Details) Sheet http://www.bhbt.com/role/DisclosureEmployeeBenefitPlansAssumptionsDetails EMPLOYEE BENEFIT PLANS - Assumptions (Details) Details 83 false false R84.htm 40805 - Disclosure - EMPLOYEE BENEFIT PLANS - Allocation of Plan Assets (Details) Sheet http://www.bhbt.com/role/DisclosureEmployeeBenefitPlansAllocationOfPlanAssetsDetails EMPLOYEE BENEFIT PLANS - Allocation of Plan Assets (Details) Details 84 false false R85.htm 40806 - Disclosure - EMPLOYEE BENEFIT PLANS - Estimated Benefit Payments (Details) Sheet http://www.bhbt.com/role/DisclosureEmployeeBenefitPlansEstimatedBenefitPaymentsDetails EMPLOYEE BENEFIT PLANS - Estimated Benefit Payments (Details) Details 85 false false R86.htm 40807 - Disclosure - EMPLOYEE BENEFIT PLANS - 401(k) and Other plans (Details) Sheet http://www.bhbt.com/role/DisclosureEmployeeBenefitPlans401KAndOtherPlansDetails EMPLOYEE BENEFIT PLANS - 401(k) and Other plans (Details) Details 86 false false R87.htm 40901 - Disclosure - INCOME TAXES - Components of Income Tax Expense (Details) Sheet http://www.bhbt.com/role/DisclosureIncomeTaxesComponentsOfIncomeTaxExpenseDetails INCOME TAXES - Components of Income Tax Expense (Details) Details 87 false false R88.htm 40902 - Disclosure - INCOME TAXES - Effective Income Tax Reconciliation (Details) Sheet http://www.bhbt.com/role/DisclosureIncomeTaxesEffectiveIncomeTaxReconciliationDetails INCOME TAXES - Effective Income Tax Reconciliation (Details) Details 88 false false R89.htm 40903 - Disclosure - INCOME TAXES - Deferred Tax Assets and Liabilities (Details) Sheet http://www.bhbt.com/role/DisclosureIncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails INCOME TAXES - Deferred Tax Assets and Liabilities (Details) Details 89 false false R90.htm 40904 - Disclosure - INCOME TAXES - Tax Cuts and Jobs Act (Details) Sheet http://www.bhbt.com/role/DisclosureIncomeTaxesTaxCutsAndJobsActDetails INCOME TAXES - Tax Cuts and Jobs Act (Details) Details 90 false false R91.htm 41001 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Details) Sheet http://www.bhbt.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesDetails DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Details) Details http://www.bhbt.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesTables 91 false false R92.htm 41002 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Amount of Gain (Loss) recognized in Other Comprehensive Income (Details) Sheet http://www.bhbt.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesAmountOfGainLossRecognizedInOtherComprehensiveIncomeDetails DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Amount of Gain (Loss) recognized in Other Comprehensive Income (Details) Details 92 false false R93.htm 41003 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Additional information (Details) Sheet http://www.bhbt.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesAdditionalInformationDetails DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Additional information (Details) Details 93 false false R94.htm 41004 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Effect of cash flow hedging and fair value (Details) Sheet http://www.bhbt.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesEffectOfCashFlowHedgingAndFairValueDetails DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Effect of cash flow hedging and fair value (Details) Details 94 false false R95.htm 41005 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting Assets and Liabilities (Details) Sheet http://www.bhbt.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesOffsettingAssetsAndLiabilitiesDetails DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting Assets and Liabilities (Details) Details 95 false false R96.htm 41101 - Disclosure - OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES (Details) Sheet http://www.bhbt.com/role/DisclosureOtherCommitmentsContingenciesAndOffBalanceSheetActivitiesDetails OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES (Details) Details http://www.bhbt.com/role/DisclosureOtherCommitmentsContingenciesAndOffBalanceSheetActivitiesTables 96 false false R97.htm 41201 - Disclosure - SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Actual and Required Capital Ratios (Details) Sheet http://www.bhbt.com/role/DisclosureShareholdersEquityAndEarningsPerCommonShareActualAndRequiredCapitalRatiosDetails SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Actual and Required Capital Ratios (Details) Details 97 false false R98.htm 41202 - Disclosure - SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Components of AOCI (Details) Sheet http://www.bhbt.com/role/DisclosureShareholdersEquityAndEarningsPerCommonShareComponentsOfAociDetails SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Components of AOCI (Details) Details 98 false false R99.htm 41203 - Disclosure - SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Components of OCI (Details) Sheet http://www.bhbt.com/role/DisclosureShareholdersEquityAndEarningsPerCommonShareComponentsOfOciDetails SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Components of OCI (Details) Details 99 false false R100.htm 41204 - Disclosure - SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Changes in AOCI (Details) Sheet http://www.bhbt.com/role/DisclosureShareholdersEquityAndEarningsPerCommonShareChangesInAociDetails SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Changes in AOCI (Details) Details 100 false false R101.htm 41205 - Disclosure - SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Amounts Reclassified Out of AOCI (Details) Sheet http://www.bhbt.com/role/DisclosureShareholdersEquityAndEarningsPerCommonShareAmountsReclassifiedOutOfAociDetails SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Amounts Reclassified Out of AOCI (Details) Details 101 false false R102.htm 41206 - Disclosure - SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Earnings Per Share (Details) Sheet http://www.bhbt.com/role/DisclosureShareholdersEquityAndEarningsPerCommonShareEarningsPerShareDetails SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Earnings Per Share (Details) Details 102 false false R103.htm 41301 - Disclosure - STOCK-BASED COMPENSATION PLANS - (Details) Sheet http://www.bhbt.com/role/DisclosureStockBasedCompensationPlansDetails STOCK-BASED COMPENSATION PLANS - (Details) Details http://www.bhbt.com/role/DisclosureStockBasedCompensationPlansTables 103 false false R104.htm 41302 - Disclosure - STOCK-BASED COMPENSATION PLANS - Compensation Expense (Details) Sheet http://www.bhbt.com/role/DisclosureStockBasedCompensationPlansCompensationExpenseDetails STOCK-BASED COMPENSATION PLANS - Compensation Expense (Details) Details 104 false false R105.htm 41303 - Disclosure - STOCK-BASED COMPENSATION PLANS - Tax Benefits (Details) Sheet http://www.bhbt.com/role/DisclosureStockBasedCompensationPlansTaxBenefitsDetails STOCK-BASED COMPENSATION PLANS - Tax Benefits (Details) Details 105 false false R106.htm 41304 - Disclosure - STOCK-BASED COMPENSATION PLANS - Stock Options Activity (Details) Sheet http://www.bhbt.com/role/DisclosureStockBasedCompensationPlansStockOptionsActivityDetails STOCK-BASED COMPENSATION PLANS - Stock Options Activity (Details) Details 106 false false R107.htm 41305 - Disclosure - STOCK-BASED COMPENSATION PLANS - Restricted Stock Award Activity (Details) Sheet http://www.bhbt.com/role/DisclosureStockBasedCompensationPlansRestrictedStockAwardActivityDetails STOCK-BASED COMPENSATION PLANS - Restricted Stock Award Activity (Details) Details 107 false false R108.htm 41306 - Disclosure - STOCK-BASED COMPENSATION PLANS - Intrinsic value, Unrecognized compensation and Contractual term (Details) Sheet http://www.bhbt.com/role/DisclosureStockBasedCompensationPlansIntrinsicValueUnrecognizedCompensationAndContractualTermDetails STOCK-BASED COMPENSATION PLANS - Intrinsic value, Unrecognized compensation and Contractual term (Details) Details 108 false false R109.htm 41307 - Disclosure - STOCK-BASED COMPENSATION PLANS - Stock Units Activity (Details) Sheet http://www.bhbt.com/role/DisclosureStockBasedCompensationPlansStockUnitsActivityDetails STOCK-BASED COMPENSATION PLANS - Stock Units Activity (Details) Details 109 false false R110.htm 41308 - Disclosure - STOCK-BASED COMPENSATION PLANS - Employee Stock Purchase Plan (Details) Sheet http://www.bhbt.com/role/DisclosureStockBasedCompensationPlansEmployeeStockPurchasePlanDetails STOCK-BASED COMPENSATION PLANS - Employee Stock Purchase Plan (Details) Details 110 false false R111.htm 41401 - Disclosure - FAIR VALUE MEASUREMENTS - Measured on Recurring Basis (Details) Sheet http://www.bhbt.com/role/DisclosureFairValueMeasurementsMeasuredOnRecurringBasisDetails FAIR VALUE MEASUREMENTS - Measured on Recurring Basis (Details) Details 111 false false R112.htm 41402 - Disclosure - FAIR VALUE MEASUREMENTS - Changes in Level 3 (Details) Sheet http://www.bhbt.com/role/DisclosureFairValueMeasurementsChangesInLevel3Details FAIR VALUE MEASUREMENTS - Changes in Level 3 (Details) Details 112 false false R113.htm 41403 - Disclosure - FAIR VALUE MEASUREMENTS - Unobservable Inputs Recurring (Details) Sheet http://www.bhbt.com/role/DisclosureFairValueMeasurementsUnobservableInputsRecurringDetails FAIR VALUE MEASUREMENTS - Unobservable Inputs Recurring (Details) Details 113 false false R114.htm 41404 - Disclosure - FAIR VALUE MEASUREMENTS - Measured on Non-recurring Basis (Details) Sheet http://www.bhbt.com/role/DisclosureFairValueMeasurementsMeasuredOnNonRecurringBasisDetails FAIR VALUE MEASUREMENTS - Measured on Non-recurring Basis (Details) Details 114 false false R115.htm 41405 - Disclosure - FAIR VALUE MEASUREMENTS - Unobservable Inputs Non-recurring (Details) Sheet http://www.bhbt.com/role/DisclosureFairValueMeasurementsUnobservableInputsNonRecurringDetails FAIR VALUE MEASUREMENTS - Unobservable Inputs Non-recurring (Details) Details 115 false false R116.htm 41406 - Disclosure - FAIR VALUE MEASUREMENTS - Fair Values and Carrying Amounts (Details) Sheet http://www.bhbt.com/role/DisclosureFairValueMeasurementsFairValuesAndCarryingAmountsDetails FAIR VALUE MEASUREMENTS - Fair Values and Carrying Amounts (Details) Details 116 false false R117.htm 41501 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) Sheet http://www.bhbt.com/role/DisclosureRevenueFromContractsWithCustomersDisaggregationOfRevenueDetails REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) Details 117 false false R118.htm 41502 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances from Contracts with Customers (Details) Sheet http://www.bhbt.com/role/DisclosureRevenueFromContractsWithCustomersContractBalancesFromContractsWithCustomersDetails REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances from Contracts with Customers (Details) Details 118 false false R119.htm 41601 - Disclosure - LEASES - Assets and liabilities (Details) Sheet http://www.bhbt.com/role/DisclosureLeasesAssetsAndLiabilitiesDetails LEASES - Assets and liabilities (Details) Details 119 false false R120.htm 41602 - Disclosure - LEASES - Lease Term and Cost (Details) Sheet http://www.bhbt.com/role/DisclosureLeasesLeaseTermAndCostDetails LEASES - Lease Term and Cost (Details) Details 120 false false R121.htm 41603 - Disclosure - LEASES - Future Minimum Payments for Leases (Details) Sheet http://www.bhbt.com/role/DisclosureLeasesFutureMinimumPaymentsForLeasesDetails LEASES - Future Minimum Payments for Leases (Details) Details 121 false false R122.htm 41701 - Disclosure - CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY - Balance Sheets (Details) Sheet http://www.bhbt.com/role/DisclosureCondensedFinancialStatementsOfParentCompanyBalanceSheetsDetails CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY - Balance Sheets (Details) Details 122 false false R123.htm 41702 - Disclosure - CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY - Statements of Income (Details) Sheet http://www.bhbt.com/role/DisclosureCondensedFinancialStatementsOfParentCompanyStatementsOfIncomeDetails CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY - Statements of Income (Details) Details 123 false false R124.htm 41703 - Disclosure - CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY - Cash Flows (Details) Sheet http://www.bhbt.com/role/DisclosureCondensedFinancialStatementsOfParentCompanyCashFlowsDetails CONDENSED FINANCIAL STATEMENTS OF PARENT COMPANY - Cash Flows (Details) Details 124 false false R125.htm 41801 - Disclosure - QUARTERLY FINANCIAL DATA (UNAUDITED) - Revision to comprehensive income (Details) Sheet http://www.bhbt.com/role/DisclosureQuarterlyFinancialDataUnauditedRevisionToComprehensiveIncomeDetails QUARTERLY FINANCIAL DATA (UNAUDITED) - Revision to comprehensive income (Details) Details 125 false false All Reports Book All Reports bhb-20211231x10k.htm bhb-20211231.xsd bhb-20211231_cal.xml bhb-20211231_def.xml bhb-20211231_lab.xml bhb-20211231_pre.xml bhb-20211231xex10d6.htm bhb-20211231xex10d7.htm bhb-20211231xex21d1.htm bhb-20211231xex23d1.htm bhb-20211231xex31d1.htm bhb-20211231xex31d2.htm bhb-20211231xex32d1.htm bhb-20211231xex32d2.htm bhb-20211231x10k001.jpg bhb-20211231x10k002.jpg bhb-20211231x10k003.jpg http://fasb.org/srt/2021-01-31 http://fasb.org/us-gaap/2021-01-31 http://xbrl.sec.gov/dei/2021q4 true true