3.26.1 html 307 344 1 false 64 0 false 5 false false R1.htm 995200090 - Document - Document and Entity Information Sheet http://bsnb.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 995200100 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://bsnb.com/role/StatementConsolidatedBalanceSheets CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 995200105 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://bsnb.com/role/StatementConsolidatedBalanceSheetsParenthetical CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 3 false false R4.htm 995200200 - Statement - CONSOLIDATED STATEMENTS OF INCOME (LOSS) Sheet http://bsnb.com/role/StatementConsolidatedStatementsOfIncomeLoss CONSOLIDATED STATEMENTS OF INCOME (LOSS) Statements 4 false false R5.htm 995200300 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Sheet http://bsnb.com/role/StatementConsolidatedStatementsOfComprehensiveIncomeLoss CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Statements 5 false false R6.htm 995200400 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY Sheet http://bsnb.com/role/StatementConsolidatedStatementsOfChangesInShareholdersEquity CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY Statements 6 false false R7.htm 995200405 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) Sheet http://bsnb.com/role/StatementConsolidatedStatementsOfChangesInShareholdersEquityParenthetical CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) Statements 7 false false R8.htm 995200500 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://bsnb.com/role/StatementConsolidatedStatementsOfCashFlows CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 8 false false R9.htm 995210101 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Sheet http://bsnb.com/role/DisclosureSummaryOfSignificantAccountingPolicies SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Notes 9 false false R10.htm 995210201 - Disclosure - BUSINESS COMBINATION Sheet http://bsnb.com/role/DisclosureBusinessCombination BUSINESS COMBINATION Notes 10 false false R11.htm 995210301 - Disclosure - SECURITIES Sheet http://bsnb.com/role/DisclosureSecurities SECURITIES Notes 11 false false R12.htm 995210401 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES Sheet http://bsnb.com/role/DisclosureLoansAndAllowanceForCreditLosses LOANS AND ALLOWANCE FOR CREDIT LOSSES Notes 12 false false R13.htm 995210501 - Disclosure - FAIR VALUE Sheet http://bsnb.com/role/DisclosureFairValue FAIR VALUE Notes 13 false false R14.htm 995210601 - Disclosure - DEPOSITS Sheet http://bsnb.com/role/DisclosureDeposits DEPOSITS Notes 14 false false R15.htm 995210701 - Disclosure - BORROWINGS Sheet http://bsnb.com/role/DisclosureBorrowings BORROWINGS Notes 15 false false R16.htm 995210801 - Disclosure - JUNIOR SUBORDINATED DEBENTURES Sheet http://bsnb.com/role/DisclosureJuniorSubordinatedDebentures JUNIOR SUBORDINATED DEBENTURES Notes 16 false false R17.htm 995210901 - Disclosure - COMMITMENTS AND CONTINGENT LIABILITIES Sheet http://bsnb.com/role/DisclosureCommitmentsAndContingentLiabilities COMMITMENTS AND CONTINGENT LIABILITIES Notes 17 false false R18.htm 995211001 - Disclosure - Earnings Per Share ("EPS") Sheet http://bsnb.com/role/DisclosureEarningsPerShareeps Earnings Per Share ("EPS") Notes 18 false false R19.htm 995211101 - Disclosure - GOODWILL AND OTHER INTANGIBLES Sheet http://bsnb.com/role/DisclosureGoodwillAndOtherIntangibles GOODWILL AND OTHER INTANGIBLES Notes 19 false false R20.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 20 false false R21.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 21 false false R22.htm 99920102 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) Sheet http://bsnb.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) Policies 22 false false R23.htm 99930203 - Disclosure - BUSINESS COMBINATION (Tables) Sheet http://bsnb.com/role/DisclosureBusinessCombinationTables BUSINESS COMBINATION (Tables) Tables http://bsnb.com/role/DisclosureBusinessCombination 23 false false R24.htm 99930303 - Disclosure - SECURITIES (Tables) Sheet http://bsnb.com/role/DisclosureSecuritiesTables SECURITIES (Tables) Tables http://bsnb.com/role/DisclosureSecurities 24 false false R25.htm 99930403 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES (Tables) Sheet http://bsnb.com/role/DisclosureLoansAndAllowanceForCreditLossesTables LOANS AND ALLOWANCE FOR CREDIT LOSSES (Tables) Tables http://bsnb.com/role/DisclosureLoansAndAllowanceForCreditLosses 25 false false R26.htm 99930503 - Disclosure - FAIR VALUE (Tables) Sheet http://bsnb.com/role/DisclosureFairValueTables FAIR VALUE (Tables) Tables http://bsnb.com/role/DisclosureFairValue 26 false false R27.htm 99930603 - Disclosure - DEPOSITS (Tables) Sheet http://bsnb.com/role/DisclosureDepositsTables DEPOSITS (Tables) Tables http://bsnb.com/role/DisclosureDeposits 27 false false R28.htm 99930903 - Disclosure - COMMITMENTS AND CONTINGENT LIABILITIES (Tables) Sheet http://bsnb.com/role/DisclosureCommitmentsAndContingentLiabilitiesTables COMMITMENTS AND CONTINGENT LIABILITIES (Tables) Tables http://bsnb.com/role/DisclosureCommitmentsAndContingentLiabilities 28 false false R29.htm 99931003 - Disclosure - Earnings Per Share ("EPS") (Tables) Sheet http://bsnb.com/role/DisclosureEarningsPerShareepsTables Earnings Per Share ("EPS") (Tables) Tables http://bsnb.com/role/DisclosureEarningsPerShareeps 29 false false R30.htm 99931103 - Disclosure - GOODWILL AND OTHER INTANGIBLES (Tables) Sheet http://bsnb.com/role/DisclosureGoodwillAndOtherIntangiblesTables GOODWILL AND OTHER INTANGIBLES (Tables) Tables http://bsnb.com/role/DisclosureGoodwillAndOtherIntangibles 30 false false R31.htm 99940101 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) Sheet http://bsnb.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) Details http://bsnb.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies 31 false false R32.htm 99940201 - Disclosure - BUSINESS COMBINATION - Merger (Details) Sheet http://bsnb.com/role/DisclosureBusinessCombinationMergerDetails BUSINESS COMBINATION - Merger (Details) Details 32 false false R33.htm 99940202 - Disclosure - BUSINESS COMBINATION - Purchase price (Details) Sheet http://bsnb.com/role/DisclosureBusinessCombinationPurchasePriceDetails BUSINESS COMBINATION - Purchase price (Details) Details 33 false false R34.htm 99940203 - Disclosure - BUSINESS COMBINATION - Assets acquired and liabilities assumed (Details) Sheet http://bsnb.com/role/DisclosureBusinessCombinationAssetsAcquiredAndLiabilitiesAssumedDetails BUSINESS COMBINATION - Assets acquired and liabilities assumed (Details) Details 34 false false R35.htm 99940204 - Disclosure - BUSINESS COMBINATION - Loans (Details) Sheet http://bsnb.com/role/DisclosureBusinessCombinationLoansDetails BUSINESS COMBINATION - Loans (Details) Details 35 false false R36.htm 99940205 - Disclosure - BUSINESS COMBINATION - Core deposit intangible and Pro forma information (Details) Sheet http://bsnb.com/role/DisclosureBusinessCombinationCoreDepositIntangibleAndProFormaInformationDetails BUSINESS COMBINATION - Core deposit intangible and Pro forma information (Details) Details 36 false false R37.htm 99940301 - Disclosure - SECURITIES - Reconciliation (Details) Sheet http://bsnb.com/role/DisclosureSecuritiesReconciliationDetails SECURITIES - Reconciliation (Details) Details 37 false false R38.htm 99940302 - Disclosure - SECURITIES - Narratives (Details) Sheet http://bsnb.com/role/DisclosureSecuritiesNarrativesDetails SECURITIES - Narratives (Details) Details 38 false false R39.htm 99940303 - Disclosure - SECURITIES - Contractual maturity (Details) Sheet http://bsnb.com/role/DisclosureSecuritiesContractualMaturityDetails SECURITIES - Contractual maturity (Details) Details 39 false false R40.htm 99940304 - Disclosure - SECURITIES - Continuous unrealized loss position (Details) Sheet http://bsnb.com/role/DisclosureSecuritiesContinuousUnrealizedLossPositionDetails SECURITIES - Continuous unrealized loss position (Details) Details 40 false false R41.htm 99940401 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of loans (Details) Sheet http://bsnb.com/role/DisclosureLoansAndAllowanceForCreditLossesSummaryOfLoansDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of loans (Details) Details 41 false false R42.htm 99940402 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Activity in the allowance for credit losses (Details) Sheet http://bsnb.com/role/DisclosureLoansAndAllowanceForCreditLossesActivityInAllowanceForCreditLossesDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Activity in the allowance for credit losses (Details) Details 42 false false R43.htm 99940403 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Nonaccrual status (Details) Sheet http://bsnb.com/role/DisclosureLoansAndAllowanceForCreditLossesNonaccrualStatusDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Nonaccrual status (Details) Details 43 false false R44.htm 99940404 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narratives (Details) Sheet http://bsnb.com/role/DisclosureLoansAndAllowanceForCreditLossesNarrativesDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narratives (Details) Details 44 false false R45.htm 99940405 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Financing receivable past due (Details) Sheet http://bsnb.com/role/DisclosureLoansAndAllowanceForCreditLossesFinancingReceivablePastDueDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Financing receivable past due (Details) Details 45 false false R46.htm 99940406 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Financing receivable modified (Details) Sheet http://bsnb.com/role/DisclosureLoansAndAllowanceForCreditLossesFinancingReceivableModifiedDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Financing receivable modified (Details) Details 46 false false R47.htm 99940407 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES - Credit quality indicator (Details) Sheet http://bsnb.com/role/DisclosureLoansAndAllowanceForCreditLossesCreditQualityIndicatorDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES - Credit quality indicator (Details) Details 47 false false R48.htm 99940501 - Disclosure - FAIR VALUE - Assets and Liabilities Measured on a Recurring and Non-Recurring Basis (Details) Sheet http://bsnb.com/role/DisclosureFairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonRecurringBasisDetails FAIR VALUE - Assets and Liabilities Measured on a Recurring and Non-Recurring Basis (Details) Details 48 false false R49.htm 99940502 - Disclosure - FAIR VALUE - Carrying value and estimated fair value (Details) Sheet http://bsnb.com/role/DisclosureFairValueCarryingValueAndEstimatedFairValueDetails FAIR VALUE - Carrying value and estimated fair value (Details) Details 49 false false R50.htm 99940601 - Disclosure - DEPOSITS - Contractual maturities of time deposits (Details) Sheet http://bsnb.com/role/DisclosureDepositsContractualMaturitiesOfTimeDepositsDetails DEPOSITS - Contractual maturities of time deposits (Details) Details 50 false false R51.htm 99940602 - Disclosure - DEPOSITS (Details) Sheet http://bsnb.com/role/DisclosureDepositsDetails DEPOSITS (Details) Details http://bsnb.com/role/DisclosureDepositsTables 51 false false R52.htm 99940701 - Disclosure - BORROWINGS (Details) Sheet http://bsnb.com/role/DisclosureBorrowingsDetails BORROWINGS (Details) Details http://bsnb.com/role/DisclosureBorrowings 52 false false R53.htm 99940801 - Disclosure - JUNIOR SUBORDINATED DEBENTURES (Details) Sheet http://bsnb.com/role/DisclosureJuniorSubordinatedDebenturesDetails JUNIOR SUBORDINATED DEBENTURES (Details) Details http://bsnb.com/role/DisclosureJuniorSubordinatedDebentures 53 false false R54.htm 99940901 - Disclosure - COMMITMENTS AND CONTINGENT LIABILITIES (Details) Sheet http://bsnb.com/role/DisclosureCommitmentsAndContingentLiabilitiesDetails COMMITMENTS AND CONTINGENT LIABILITIES (Details) Details http://bsnb.com/role/DisclosureCommitmentsAndContingentLiabilitiesTables 54 false false R55.htm 99941001 - Disclosure - Earnings Per Share ("EPS") (Details) Sheet http://bsnb.com/role/DisclosureEarningsPerShareepsDetails Earnings Per Share ("EPS") (Details) Details http://bsnb.com/role/DisclosureEarningsPerShareepsTables 55 false false R56.htm 99941101 - Disclosure - GOODWILL AND OTHER INTANGIBLES - Goodwill (Details) Sheet http://bsnb.com/role/DisclosureGoodwillAndOtherIntangiblesGoodwillDetails GOODWILL AND OTHER INTANGIBLES - Goodwill (Details) Details 56 false false R57.htm 99941102 - Disclosure - GOODWILL AND OTHER INTANGIBLES - Components of other intangible assets (Details) Sheet http://bsnb.com/role/DisclosureGoodwillAndOtherIntangiblesComponentsOfOtherIntangibleAssetsDetails GOODWILL AND OTHER INTANGIBLES - Components of other intangible assets (Details) Details 57 false false R58.htm 99941103 - Disclosure - GOODWILL AND OTHER INTANGIBLES - Narrative (Details) Sheet http://bsnb.com/role/DisclosureGoodwillAndOtherIntangiblesNarrativeDetails GOODWILL AND OTHER INTANGIBLES - Narrative (Details) Details 58 false false R59.htm 99941104 - Disclosure - GOODWILL AND OTHER INTANGIBLES - Future amortization expense (Details) Sheet http://bsnb.com/role/DisclosureGoodwillAndOtherIntangiblesFutureAmortizationExpenseDetails GOODWILL AND OTHER INTANGIBLES - Future amortization expense (Details) Details 59 false false All Reports Book All Reports tmb-20260630.xsd tmb-20260630_cal.xml tmb-20260630_def.xml tmb-20260630_lab.xml tmb-20260630_pre.xml tmb-20260630x10q.htm http://fasb.org/us-gaap/2026 http://xbrl.sec.gov/dei/2026 http://xbrl.sec.gov/ecd/2026 true true