3.26.3 html 375 279 1 true 51 0 false 5 false false R1.htm 75000 - Document - Document and Entity Information Sheet http://baycoast.bank.com/20260630/taxonomy/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 75010 - Statement - Consolidated Balance Sheets (Unaudited) Sheet http://baycoast.bank.com/20260630/taxonomy/role/StatementConsolidatedBalanceSheetsUnaudited Consolidated Balance Sheets (Unaudited) Statements 2 false false R3.htm 75020 - Statement - Consolidated Balance Sheets (Unaudited) (Parenthetical) Sheet http://baycoast.bank.com/20260630/taxonomy/role/StatementConsolidatedBalanceSheetsUnauditedParenthetical Consolidated Balance Sheets (Unaudited) (Parenthetical) Statements 3 false false R4.htm 75030 - Statement - Consolidated Statements of Net Income (Unaudited) Sheet http://baycoast.bank.com/20260630/taxonomy/role/StatementConsolidatedStatementsOfNetIncomeUnaudited Consolidated Statements of Net Income (Unaudited) Statements 4 false false R5.htm 75040 - Statement - Consolidated Statements of Comprehensive Income (Unaudited) Sheet http://baycoast.bank.com/20260630/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncomeUnaudited Consolidated Statements of Comprehensive Income (Unaudited) Statements 5 false false R6.htm 75050 - Statement - Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) Sheet http://baycoast.bank.com/20260630/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncomeUnauditedParenthetical Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) Statements 6 false false R7.htm 75060 - Statement - Consolidated Statements of Changes in Retained Earnings (Unaudited) Sheet http://baycoast.bank.com/20260630/taxonomy/role/StatementConsolidatedStatementsOfChangesInRetainedEarningsUnaudited Consolidated Statements of Changes in Retained Earnings (Unaudited) Statements 7 false false R8.htm 75070 - Statement - Consolidated Statements of Cash Flows (Unaudited) Sheet http://baycoast.bank.com/20260630/taxonomy/role/StatementConsolidatedStatementsOfCashFlowsUnaudited Consolidated Statements of Cash Flows (Unaudited) Statements 8 false false R9.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 9 false false R10.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 10 false false R11.htm 995455 - Disclosure - Summary of Significant Accounting Policies Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 11 false false R12.htm 995465 - Disclosure - Securities Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureSecurities1 Securities Notes 12 false false R13.htm 995475 - Disclosure - Loans Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureLoans Loans Notes 13 false false R14.htm 995485 - Disclosure - Miniumum Regulatory Capital Requirements Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureMiniumumRegulatoryCapitalRequirements Miniumum Regulatory Capital Requirements Notes 14 false false R15.htm 995495 - Disclosure - Fair Value of Assets and Liabilities Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureFairValueOfAssetsAndLiabilities Fair Value of Assets and Liabilities Notes 15 false false R16.htm 995505 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://baycoast.bank.com/20260630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies 16 false false R17.htm 995515 - Disclosure - Securities (Tables) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureSecuritiesTables Securities (Tables) Tables http://baycoast.bank.com/20260630/taxonomy/role/DisclosureSecurities1 17 false false R18.htm 995525 - Disclosure - Loans (Tables) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureLoansTables Loans (Tables) Tables http://baycoast.bank.com/20260630/taxonomy/role/DisclosureLoans 18 false false R19.htm 995535 - Disclosure - Minimum Regulatory Capital Requirements (Tables) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureMinimumRegulatoryCapitalRequirementsTables Minimum Regulatory Capital Requirements (Tables) Tables 19 false false R20.htm 995545 - Disclosure - Fair Value of Assets and Liabilities (Tables) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureFairValueOfAssetsAndLiabilitiesTables Fair Value of Assets and Liabilities (Tables) Tables http://baycoast.bank.com/20260630/taxonomy/role/DisclosureFairValueOfAssetsAndLiabilities 20 false false R21.htm 995555 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails Summary of Significant Accounting Policies - Additional Information (Details) Details 21 false false R22.htm 995565 - Disclosure - Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale With Gross Unrealized Gains and Losses (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureSecuritiesScheduleOfAmortizedCostAndFairValueOfSecuritiesAvailableForSaleWithGrossUnrealizedGainsAndLossesDetails Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale With Gross Unrealized Gains and Losses (Details) Details 22 false false R23.htm 995575 - Disclosure - Securities - Additional Information (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureSecuritiesAdditionalInformationDetails Securities - Additional Information (Details) Details 23 false false R24.htm 995585 - Disclosure - Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureSecuritiesScheduleOfAmortizedCostAndFairValueOfDebtSecuritiesByContractualMaturityDetails Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) Details 24 false false R25.htm 995605 - Disclosure - Securities - Schedule of Securities in a Continuous Loss Position (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureSecuritiesScheduleOfSecuritiesInAContinuousLossPositionDetails Securities - Schedule of Securities in a Continuous Loss Position (Details) Details 25 false false R26.htm 995615 - Disclosure - Loans - Summary of the Balances of Loans (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureLoansSummaryOfTheBalancesOfLoansDetails Loans - Summary of the Balances of Loans (Details) Details 26 false false R27.htm 995625 - Disclosure - Loans - Summary of Company's Provision for Credit Loss Expense (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureLoansSummaryOfCompanysProvisionForCreditLossExpenseDetails Loans - Summary of Company's Provision for Credit Loss Expense (Details) Details 27 false false R28.htm 995635 - Disclosure - Loans - Summary of Activity in Allowance for Credit Losses (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureLoansSummaryOfActivityInAllowanceForCreditLossesDetails Loans - Summary of Activity in Allowance for Credit Losses (Details) Details 28 false false R29.htm 995645 - Disclosure - Loans - Additional Information (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureLoansAdditionalInformationDetails Loans - Additional Information (Details) Details 29 false false R30.htm 995655 - Disclosure - Loans - Summary of Past Due and Non-Accrual Loans (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureLoansSummaryOfPastDueAndNonaccrualLoansDetails Loans - Summary of Past Due and Non-Accrual Loans (Details) Details 30 false false R31.htm 995665 - Disclosure - Loans - Summary of Amortized Cost Basis of Loans on Non-Accrual Status by Portfolio Segment (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureLoansSummaryOfAmortizedCostBasisOfLoansOnNonaccrualStatusByPortfolioSegmentDetails Loans - Summary of Amortized Cost Basis of Loans on Non-Accrual Status by Portfolio Segment (Details) Details 31 false false R32.htm 995675 - Disclosure - Loans - Summary of Amortized Cost of Collateral-Dependent Loans (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureLoansSummaryOfAmortizedCostOfCollateraldependentLoansDetails Loans - Summary of Amortized Cost of Collateral-Dependent Loans (Details) Details 32 false false R33.htm 995685 - Disclosure - Loans - Summary of Amortized Cost Basis of Loans Experiencing Financial Difficulty and Modified By Class and By Type of Modification (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureLoansSummaryOfAmortizedCostBasisOfLoansExperiencingFinancialDifficultyAndModifiedByClassAndByTypeOfModificationDetails Loans - Summary of Amortized Cost Basis of Loans Experiencing Financial Difficulty and Modified By Class and By Type of Modification (Details) Details 33 false false R34.htm 995695 - Disclosure - Loans - Summary of Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureLoansSummaryOfFinancialEffectOfModificationsMadeToBorrowersExperiencingFinancialDifficultyDetails Loans - Summary of Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty (Details) Details 34 false false R35.htm 995705 - Disclosure - Loans - Summary of Amortized Cost Basis of Financing Receivables that had Payment Default (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureLoansSummaryOfAmortizedCostBasisOfFinancingReceivablesThatHadPaymentDefaultDetails Loans - Summary of Amortized Cost Basis of Financing Receivables that had Payment Default (Details) Details 35 false false R36.htm 995715 - Disclosure - Loans - Schedule of Loans by Year of Origination, Loan Segmentation and Risk Indicator (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureLoansScheduleOfLoansByYearOfOriginationLoanSegmentationAndRiskIndicatorDetails Loans - Schedule of Loans by Year of Origination, Loan Segmentation and Risk Indicator (Details) Details 36 false false R37.htm 995725 - Disclosure - Minimum Regulatory Capital Requirments - Additional Information (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureMinimumRegulatoryCapitalRequirmentsAdditionalInformationDetails Minimum Regulatory Capital Requirments - Additional Information (Details) Details 37 false false R38.htm 995735 - Disclosure - Minimum Regulatory Capital Requirements - Schedule of Actual Capital Amounts and Ratios (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureMinimumRegulatoryCapitalRequirementsScheduleOfActualCapitalAmountsAndRatiosDetails Minimum Regulatory Capital Requirements - Schedule of Actual Capital Amounts and Ratios (Details) Details 38 false false R39.htm 995745 - Disclosure - Fair Value of Assets and Liabilities - Summary of Assets and Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureFairValueOfAssetsAndLiabilitiesSummaryOfAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringAndNonrecurringBasisDetails Fair Value of Assets and Liabilities - Summary of Assets and Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis (Details) Details 39 false false R40.htm 995755 - Disclosure - Fair Value of Assets and Liabilities - Summary of Estimated Fair Values of Financial Instrument (Details) Sheet http://baycoast.bank.com/20260630/taxonomy/role/DisclosureFairValueOfAssetsAndLiabilitiesSummaryOfEstimatedFairValuesOfFinancialInstrumentDetails Fair Value of Assets and Liabilities - Summary of Estimated Fair Values of Financial Instrument (Details) Details 40 false false All Reports Book All Reports nara-20260630.htm nara-20260630.xsd http://fasb.org/us-gaap/2026 http://xbrl.sec.gov/dei/2026 http://xbrl.sec.gov/ecd/2026 false false