3.25.3 html 521 355 1 true 76 0 false 5 false false R1.htm 00000001 - Document - Cover Sheet http://banklandmark.com/role/Cover Cover Cover 1 false false R2.htm 00000002 - Statement - Consolidated Balance Sheets Sheet http://banklandmark.com/role/BalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 00000003 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://banklandmark.com/role/BalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 00000004 - Statement - Consolidated Statements of Earnings (Unaudited) Sheet http://banklandmark.com/role/StatementsOfEarnings Consolidated Statements of Earnings (Unaudited) Statements 4 false false R5.htm 00000005 - Statement - Consolidated Statements of Earnings (Unaudited) (Parenthetical) Sheet http://banklandmark.com/role/StatementsOfEarningsParenthetical Consolidated Statements of Earnings (Unaudited) (Parenthetical) Statements 5 false false R6.htm 00000006 - Statement - Consolidated Statements of Comprehensive Income (Unaudited) Sheet http://banklandmark.com/role/StatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income (Unaudited) Statements 6 false false R7.htm 00000007 - Statement - Consolidated Statements of Stockholders' Equity (Unaudited) Sheet http://banklandmark.com/role/StatementsOfStockholdersEquity Consolidated Statements of Stockholders' Equity (Unaudited) Statements 7 false false R8.htm 00000008 - Statement - Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) Sheet http://banklandmark.com/role/StatementsOfStockholdersEquityParenthetical Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) Statements 8 false false R9.htm 00000009 - Statement - Consolidated Statements of Cash Flows (Unaudited) Sheet http://banklandmark.com/role/StatementsOfCashFlows Consolidated Statements of Cash Flows (Unaudited) Statements 9 false false R10.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 10 false false R11.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 11 false false R12.htm 999017 - Disclosure - Interim Financial Statements Sheet http://banklandmark.com/role/InterimFinancialStatements Interim Financial Statements Notes 12 false false R13.htm 999018 - Disclosure - Investments Sheet http://banklandmark.com/role/Investments Investments Notes 13 false false R14.htm 999019 - Disclosure - Loans and Allowance for Credit Losses Sheet http://banklandmark.com/role/LoansAndAllowanceForCreditLosses Loans and Allowance for Credit Losses Notes 14 false false R15.htm 999020 - Disclosure - Goodwill and Other Intangible Assets Sheet http://banklandmark.com/role/GoodwillAndOtherIntangibleAssets Goodwill and Other Intangible Assets Notes 15 false false R16.htm 999021 - Disclosure - Mortgage Loan Servicing Sheet http://banklandmark.com/role/MortgageLoanServicing Mortgage Loan Servicing Notes 16 false false R17.htm 999022 - Disclosure - Earnings per Share Sheet http://banklandmark.com/role/EarningsPerShare Earnings per Share Notes 17 false false R18.htm 999023 - Disclosure - Federal Home Loan Bank Borrowings and Other Borrowings Sheet http://banklandmark.com/role/FederalHomeLoanBankBorrowingsAndOtherBorrowings Federal Home Loan Bank Borrowings and Other Borrowings Notes 18 false false R19.htm 999024 - Disclosure - Repurchase Agreements Sheet http://banklandmark.com/role/RepurchaseAgreements Repurchase Agreements Notes 19 false false R20.htm 999025 - Disclosure - Revenue from Contracts with Customers Sheet http://banklandmark.com/role/RevenueFromContractsWithCustomers Revenue from Contracts with Customers Notes 20 false false R21.htm 999026 - Disclosure - Fair Value of Financial Instruments and Fair Value Measurements Sheet http://banklandmark.com/role/FairValueOfFinancialInstrumentsAndFairValueMeasurements Fair Value of Financial Instruments and Fair Value Measurements Notes 21 false false R22.htm 999027 - Disclosure - Regulatory Capital Requirements Sheet http://banklandmark.com/role/RegulatoryCapitalRequirements Regulatory Capital Requirements Notes 22 false false R23.htm 999028 - Disclosure - Investments (Tables) Sheet http://banklandmark.com/role/InvestmentsTables Investments (Tables) Tables http://banklandmark.com/role/Investments 23 false false R24.htm 999029 - Disclosure - Loans and Allowance for Credit Losses (Tables) Sheet http://banklandmark.com/role/LoansAndAllowanceForCreditLossesTables Loans and Allowance for Credit Losses (Tables) Tables http://banklandmark.com/role/LoansAndAllowanceForCreditLosses 24 false false R25.htm 999030 - Disclosure - Goodwill and Other Intangible Assets (Tables) Sheet http://banklandmark.com/role/GoodwillAndOtherIntangibleAssetsTables Goodwill and Other Intangible Assets (Tables) Tables http://banklandmark.com/role/GoodwillAndOtherIntangibleAssets 25 false false R26.htm 999031 - Disclosure - Mortgage Loan Servicing (Tables) Sheet http://banklandmark.com/role/MortgageLoanServicingTables Mortgage Loan Servicing (Tables) Tables http://banklandmark.com/role/MortgageLoanServicing 26 false false R27.htm 999032 - Disclosure - Earnings per Share (Tables) Sheet http://banklandmark.com/role/EarningsPerShareTables Earnings per Share (Tables) Tables http://banklandmark.com/role/EarningsPerShare 27 false false R28.htm 999033 - Disclosure - Repurchase Agreements (Tables) Sheet http://banklandmark.com/role/RepurchaseAgreementsTables Repurchase Agreements (Tables) Tables http://banklandmark.com/role/RepurchaseAgreements 28 false false R29.htm 999034 - Disclosure - Revenue from Contracts with Customers (Tables) Sheet http://banklandmark.com/role/RevenueFromContractsWithCustomersTables Revenue from Contracts with Customers (Tables) Tables http://banklandmark.com/role/RevenueFromContractsWithCustomers 29 false false R30.htm 999035 - Disclosure - Fair Value of Financial Instruments and Fair Value Measurements (Tables) Sheet http://banklandmark.com/role/FairValueOfFinancialInstrumentsAndFairValueMeasurementsTables Fair Value of Financial Instruments and Fair Value Measurements (Tables) Tables http://banklandmark.com/role/FairValueOfFinancialInstrumentsAndFairValueMeasurements 30 false false R31.htm 999036 - Disclosure - Regulatory Capital Requirements (Tables) Sheet http://banklandmark.com/role/RegulatoryCapitalRequirementsTables Regulatory Capital Requirements (Tables) Tables http://banklandmark.com/role/RegulatoryCapitalRequirements 31 false false R32.htm 999037 - Disclosure - Schedule of Available-for-sale and Held to Maturity Securities (Details) Sheet http://banklandmark.com/role/ScheduleOfAvailable-for-saleAndHeldToMaturitySecuritiesDetails Schedule of Available-for-sale and Held to Maturity Securities (Details) Details 32 false false R33.htm 999038 - Disclosure - Schedule of Available for Sale Securities Continuous Unrealized Loss Position Fair Value (Details) Sheet http://banklandmark.com/role/ScheduleOfAvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueDetails Schedule of Available for Sale Securities Continuous Unrealized Loss Position Fair Value (Details) Details 33 false false R34.htm 999039 - Disclosure - Schedule of Allowance for Credit Losses Related to Held-to-maturity Investment Securities (Details) Sheet http://banklandmark.com/role/ScheduleOfAllowanceForCreditLossesRelatedToHeld-to-maturityInvestmentSecuritiesDetails Schedule of Allowance for Credit Losses Related to Held-to-maturity Investment Securities (Details) Details 34 false false R35.htm 999040 - Disclosure - Schedule of Investments Classified by Contractual Maturity Date (Details) Sheet http://banklandmark.com/role/ScheduleOfInvestmentsClassifiedByContractualMaturityDateDetails Schedule of Investments Classified by Contractual Maturity Date (Details) Details 35 false false R36.htm 999041 - Disclosure - Schedule of Realized Gain (loss) (Details) Sheet http://banklandmark.com/role/ScheduleOfRealizedGainLossDetails Schedule of Realized Gain (loss) (Details) Details 36 false false R37.htm 999042 - Disclosure - Investments (Details Narrative) Sheet http://banklandmark.com/role/InvestmentsDetailsNarrative Investments (Details Narrative) Details http://banklandmark.com/role/InvestmentsTables 37 false false R38.htm 999043 - Disclosure - Schedule of Loans (Details) Sheet http://banklandmark.com/role/ScheduleOfLoansDetails Schedule of Loans (Details) Details 38 false false R39.htm 999044 - Disclosure - Schedule of Allowance for Credit Losses on Financing Receivables (Details) Sheet http://banklandmark.com/role/ScheduleOfAllowanceForCreditLossesOnFinancingReceivablesDetails Schedule of Allowance for Credit Losses on Financing Receivables (Details) Details 39 false false R40.htm 999045 - Disclosure - Schedule of Non-accrual and Loans Past Due Over 89 Days Still Accruing (Details) Sheet http://banklandmark.com/role/ScheduleOfNon-accrualAndLoansPastDueOver89DaysStillAccruingDetails Schedule of Non-accrual and Loans Past Due Over 89 Days Still Accruing (Details) Details 40 false false R41.htm 999046 - Disclosure - Schedule of Amortized Cost Basis and Collateral Type of Collateral Dependent Loans (Details) Sheet http://banklandmark.com/role/ScheduleOfAmortizedCostBasisAndCollateralTypeOfCollateralDependentLoansDetails Schedule of Amortized Cost Basis and Collateral Type of Collateral Dependent Loans (Details) Details 41 false false R42.htm 999047 - Disclosure - Schedule of Past Due and Non-accrual Loans by Loan Class (Details) Sheet http://banklandmark.com/role/ScheduleOfPastDueAndNon-accrualLoansByLoanClassDetails Schedule of Past Due and Non-accrual Loans by Loan Class (Details) Details 42 false false R43.htm 999048 - Disclosure - Schedule of Loans by Risk Category by Type and Year of Origination (Details) Sheet http://banklandmark.com/role/ScheduleOfLoansByRiskCategoryByTypeAndYearOfOriginationDetails Schedule of Loans by Risk Category by Type and Year of Origination (Details) Details 43 false false R44.htm 999049 - Disclosure - Schedule of Allowance for Credit Losses Related to Unfunded Loan Commitments (Details) Sheet http://banklandmark.com/role/ScheduleOfAllowanceForCreditLossesRelatedToUnfundedLoanCommitmentsDetails Schedule of Allowance for Credit Losses Related to Unfunded Loan Commitments (Details) Details 44 false false R45.htm 999050 - Disclosure - Schedule of Modifications to Borrowers Experiencing Financial Difficulty (Details) Sheet http://banklandmark.com/role/ScheduleOfModificationsToBorrowersExperiencingFinancialDifficultyDetails Schedule of Modifications to Borrowers Experiencing Financial Difficulty (Details) Details 45 false false R46.htm 999051 - Disclosure - Loans and Allowance for Credit Losses (Details Narrative) Sheet http://banklandmark.com/role/LoansAndAllowanceForCreditLossesDetailsNarrative Loans and Allowance for Credit Losses (Details Narrative) Details http://banklandmark.com/role/LoansAndAllowanceForCreditLossesTables 46 false false R47.htm 999052 - Disclosure - Schedule of Other Intangible Assets and Goodwill (Details) Sheet http://banklandmark.com/role/ScheduleOfOtherIntangibleAssetsAndGoodwillDetails Schedule of Other Intangible Assets and Goodwill (Details) Details 47 false false R48.htm 999053 - Disclosure - Schedule of Finite-lived Intangible Assets, Future Amortization Expense (Details) Sheet http://banklandmark.com/role/ScheduleOfFinite-livedIntangibleAssetsFutureAmortizationExpenseDetails Schedule of Finite-lived Intangible Assets, Future Amortization Expense (Details) Details 48 false false R49.htm 999054 - Disclosure - Schedule of Participating Mortgage Loans (Details) Sheet http://banklandmark.com/role/ScheduleOfParticipatingMortgageLoansDetails Schedule of Participating Mortgage Loans (Details) Details 49 false false R50.htm 999055 - Disclosure - Schedule of Servicing Asset at Amortized Cost (Details) Sheet http://banklandmark.com/role/ScheduleOfServicingAssetAtAmortizedCostDetails Schedule of Servicing Asset at Amortized Cost (Details) Details 50 false false R51.htm 999056 - Disclosure - Mortgage Loan Servicing (Details Narrative) Sheet http://banklandmark.com/role/MortgageLoanServicingDetailsNarrative Mortgage Loan Servicing (Details Narrative) Details http://banklandmark.com/role/MortgageLoanServicingTables 51 false false R52.htm 999057 - Disclosure - Schedule of Shares Used in Calculation of Basic and Diluted Earnings Per Share (Details) Sheet http://banklandmark.com/role/ScheduleOfSharesUsedInCalculationOfBasicAndDilutedEarningsPerShareDetails Schedule of Shares Used in Calculation of Basic and Diluted Earnings Per Share (Details) Details 52 false false R53.htm 999058 - Disclosure - Schedule of Shares Used in Calculation of Basic and Diluted Earnings Per Share (Details) (Parenthetical) Sheet http://banklandmark.com/role/ScheduleOfSharesUsedInCalculationOfBasicAndDilutedEarningsPerShareDetailsParenthetical Schedule of Shares Used in Calculation of Basic and Diluted Earnings Per Share (Details) (Parenthetical) Details 53 false false R54.htm 999059 - Disclosure - Earnings per Share (Details Narrative) Sheet http://banklandmark.com/role/EarningsPerShareDetailsNarrative Earnings per Share (Details Narrative) Details http://banklandmark.com/role/EarningsPerShareTables 54 false false R55.htm 999060 - Disclosure - Federal Home Loan Bank Borrowings and Other Borrowings (Details Narrative) Sheet http://banklandmark.com/role/FederalHomeLoanBankBorrowingsAndOtherBorrowingsDetailsNarrative Federal Home Loan Bank Borrowings and Other Borrowings (Details Narrative) Details http://banklandmark.com/role/FederalHomeLoanBankBorrowingsAndOtherBorrowings 55 false false R56.htm 999061 - Disclosure - Schedule of Repurchase Agreements (Details) Sheet http://banklandmark.com/role/ScheduleOfRepurchaseAgreementsDetails Schedule of Repurchase Agreements (Details) Details 56 false false R57.htm 999062 - Disclosure - Repurchase Agreements (Details Narrative) Sheet http://banklandmark.com/role/RepurchaseAgreementsDetailsNarrative Repurchase Agreements (Details Narrative) Details http://banklandmark.com/role/RepurchaseAgreementsTables 57 false false R58.htm 999063 - Disclosure - Schedule of Revenue from Contracts with Customers within Non-interest Income (Details) Sheet http://banklandmark.com/role/ScheduleOfRevenueFromContractsWithCustomersWithinNon-interestIncomeDetails Schedule of Revenue from Contracts with Customers within Non-interest Income (Details) Details 58 false false R59.htm 999064 - Disclosure - Schedule of Fair Value Estimates of Financial Instruments (Details) Sheet http://banklandmark.com/role/ScheduleOfFairValueEstimatesOfFinancialInstrumentsDetails Schedule of Fair Value Estimates of Financial Instruments (Details) Details 59 false false R60.htm 999065 - Disclosure - Schedule of Fair Value Instruments Measured on Recurring Basis (Details) Sheet http://banklandmark.com/role/ScheduleOfFairValueInstrumentsMeasuredOnRecurringBasisDetails Schedule of Fair Value Instruments Measured on Recurring Basis (Details) Details 60 false false R61.htm 999066 - Disclosure - Schedule of Fair Value Contractual Balance and Gain Loss on Loans Held for Sale (Details) Sheet http://banklandmark.com/role/ScheduleOfFairValueContractualBalanceAndGainLossOnLoansHeldForSaleDetails Schedule of Fair Value Contractual Balance and Gain Loss on Loans Held for Sale (Details) Details 61 false false R62.htm 999067 - Disclosure - Schedule of Gains from Changes in Fair Value of Derivative Financial Instruments (Details) Sheet http://banklandmark.com/role/ScheduleOfGainsFromChangesInFairValueOfDerivativeFinancialInstrumentsDetails Schedule of Gains from Changes in Fair Value of Derivative Financial Instruments (Details) Details 62 false false R63.htm 999068 - Disclosure - Schedule of Fair Value Measurements on Nonrecurring, Valuation Techniques (Details) Sheet http://banklandmark.com/role/ScheduleOfFairValueMeasurementsOnNonrecurringValuationTechniquesDetails Schedule of Fair Value Measurements on Nonrecurring, Valuation Techniques (Details) Details 63 false false R64.htm 999069 - Disclosure - Fair Value of Financial Instruments and Fair Value Measurements (Details Narrative) Sheet http://banklandmark.com/role/FairValueOfFinancialInstrumentsAndFairValueMeasurementsDetailsNarrative Fair Value of Financial Instruments and Fair Value Measurements (Details Narrative) Details http://banklandmark.com/role/FairValueOfFinancialInstrumentsAndFairValueMeasurementsTables 64 false false R65.htm 999070 - Disclosure - Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies (Details) Sheet http://banklandmark.com/role/ScheduleOfComplianceWithRegulatoryCapitalRequirementsForMortgageCompaniesDetails Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies (Details) Details 65 false false R66.htm 999071 - Disclosure - Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies (Details) (Parenthetical) Sheet http://banklandmark.com/role/ScheduleOfComplianceWithRegulatoryCapitalRequirementsForMortgageCompaniesDetailsParenthetical Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies (Details) (Parenthetical) Details 66 false false R67.htm 999072 - Disclosure - Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations (Details) Sheet http://banklandmark.com/role/ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsDetails Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations (Details) Details 67 false false R68.htm 999073 - Disclosure - Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations (Details) (Parenthetical) Sheet http://banklandmark.com/role/ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsDetailsParenthetical Schedule of Compliance with Regulatory Capital Requirements Under Banking Regulations (Details) (Parenthetical) Details 68 false false R69.htm 999074 - Disclosure - Regulatory Capital Requirements (Details Narrative) Sheet http://banklandmark.com/role/RegulatoryCapitalRequirementsDetailsNarrative Regulatory Capital Requirements (Details Narrative) Details http://banklandmark.com/role/RegulatoryCapitalRequirementsTables 69 false false All Reports Book All Reports form10-q.htm lark-20250930.xsd lark-20250930_cal.xml lark-20250930_def.xml lark-20250930_lab.xml lark-20250930_pre.xml http://fasb.org/srt/2025 http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true