Document And Entity Information Beyond ten years, fair value Note To Financial Statement Details Textual Significant Accounting Policies Note 2 - Securities Within one year, amortized cost Note 3 - Loans Note 4 - Premises and Equipment Within one year, fair value Note 5 - Leases One to five years, fair value Note 6 - Other Real Estate Owned Five to ten years, fair value Note 7 - Goodwill and Intangible Assets Note 8 - Deposits Residential Mortgage Backed Securities [Member] lmst_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets The minimum Tier One Common Equity ratio (Total Tier One Common Equity divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. Note 9 - Advances From the Federal Home Loan Bank Note 10 - Junior Subordinated Debentures Note 14 - Income Taxes Collateralized Debt Obligations [Member] Note 15 - Related Party Transactions Note 17 - Regulatory Capital Matters Note 18 - Off Balance Sheet Risks, Commitments, and Contingent Liabilities Note 19 - Fair Values Note 20 - Stock Plans and Stock Based Compensation Note 21 - Earnings Per Share Note 23 - Acquisitions Note 24 - Parent Company Only Condensed Financial Information Note 25 - Quarterly Financial Data (Unaudited) Note 2 - Securities - Amortized Cost, Gross Unrealized Gains or Losses, and Fair Value of Investment Securities (Details) Note 2 - Securities - Sales and Calls of Securities (Details) US States and Political Subdivisions Debt Securities [Member] Note 2 - Securities - Amortized Cost and Fair Value of Debt Investment Securities Portfolio by Contractual Maturity (Details) Note 2 - Securities - Securities With Unrealized Losses (Details) Note 3 - Loans - Loans (Details) Note 3 - Loans - Activity in Allowance for Loan Losses by Portfolio Segment (Details) Note 3 - Loans - Balance in Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Bases on Impairment Method (Details) Note 3 - Loans - Loans Individually Evaluated for Impairment by Class of Loans (Details) Note 3 - Loans - Types of Troubled Debt Restructuring Loan Modification by Portfolio Segment (Details) Note 3 - Loans - Troubled Debt Restructuring Postmodification (Details) Collateralized Loan Obligations [Member] Granted, weighted average grant price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Note 3 - Loans - Recorded Investment in Nonaccrual and Loans Past Due 90 Days and Still on Accrual by Class of Loan (Details) us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss Available for sale, unrealized loss, 12 months or more Note 3 - Loans - Aging of Recorded Investment in Past Due Loans (Details) us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss Available for sale, unrealized loss Vested, weighted average grant price (in dollars per share) Note 3 - Loans - Risk Category of Loans by Class of Loans (Details) Forfeited, weighted average grant price (in dollars per share) Note 4 - Premises and Equipment - Premises and Equipment (Details) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue Outstanding, weighted average grant price (in dollars per share) Outstanding, weighted average grant price (in dollars per share) Note 5 - Leases - Future Minimum Lease Payments (Details) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod Forfeited (in shares) Note 6 - Other Real Estate Owned - Major Categories of OREO (Details) Note 6 - Other Real Estate Owned - Activity Relating to Other Real Estate Owned (Details) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Outstanding, beginning (in shares) Outstanding, ending (in shares) Note 6 - Other Real Estate Owned - Expenses Related to Other Real Estate Owned (Details) us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss Available for sale, unrealized loss, less than 12 months Note 7 - Goodwill and Intangible Assets - Schedule of Goodwill and Intangible Assets (Details) lmst_FirstPriorityPledgePercentOfIssuedAndOutstandingStock First Priority Pledge, Percent of Issued and Outstanding Stock The amount of issued and outstanding stock of the company which secures a loan in a first priority pledge. Note 7 - Goodwill and Intangible Assets - Expected Amortization Expense (Details) Note 8 - Deposits - Deposit Balances by Category (Details) Granted (in shares) Note 8 - Deposits - Maturities of Time Deposits (Details) Corporate Debt Securities [Member] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod Vested (in shares) Note 9 - Advances From the Federal Home Loan Bank - Advances From the Federal Home Loan Bank (Details) Note 9 - Advances From the Federal Home Loan Bank - Advances From the Federal Home Loan Bank (Details) (Parentheticals) lmst_DebtInstrumentFixedRateForFirstFiveYears Debt Instrument, Fixed Rate for First Five Years The contractual interest rate for the first five years after issuance of funds under the debt agreement Note 9 - Advances From the Federal Home Loan Bank - Principal Payments on Advances From the Federal Home Loan Bank (Details) Note 10 - Junior Subordinated Debentures - Junior Subordinated Debentures (Details) US Treasury and Government [Member] us-gaap_OtherComprehensiveIncomeLossBeforeTax Net unrealized gain (loss) recognized in comprehensive income Note 14 - Income Taxes - Income Tax Expense Benefit (Details) Ten Year Subordinated Debt Note, Issued July 23, 2019 [Member] Represents the ten year subordinated debt note, issued July 23, 2019 us-gaap_OtherComprehensiveIncomeLossTax Tax effect Note 14 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) Net change in accumulated other comprehensive loss, net of taxes Other comprehensive income (loss) Note 14 - Income Taxes - Deferred Tax Assets and Liabilities (Details) Note 15 - Related Party Transactions - Loans to Related Parties (Details) Note 17 - Regulatory Capital Matters - Ratios and Amounts of Common Equity, Capital, and Total Capital to Risk-adjusted Assets (Details) Note 18 - Off Balance Sheet Risks, Commitments, and Contingent Liabilities - Contractual Amounts of Financial Instruments With Off Balance Sheet Risk (Details) Note 19 - Fair Values - Financial Assets Measured at the Fair Value on Recurring and Non-recurring Basis (Details) Note 19 - Fair Values - Qualitative Information About Level Three Fair Value Measurements for Financial Instruments Measured at Fair Value on Non-recurring Basis (Details) Note 19 - Fair Values - Carrying Amount and Estimated Fair Values of Financial Instruments (Details) Available for sale, fair value Note 20 - Stock Plans and Stock Based Compensation - Unvested Share Activity (Details) Note 20 - Stock Plans and Stock Based Compensation - Unrecognized Stock Based Compensation Expense Related to Unvested Shares (Details) Note 21 - Earnings Per Share - Basic and Diluted Loss Per Share (Details) Note 23 - Acquisitions - Assets Acquired, Liabilities Assumed, and Consideration Transferred (Details) Note 24 - Parent Company Only Condensed Financial Information - Condensed Balance Sheet (Details) Note 24 - Parent Company Only Condensed Financial Information - Condensed Statements of Operations (Details) Available for sale, fair value, less than 12 months Note 24 - Parent Company Only Condensed Financial Information - Condensed Statements of Cash Flows (Details) Available for sale, fair value, 12 months or more Note 25 - Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] Financial Instruments [Domain] us-gaap_LoansAndLeasesReceivableRelatedPartiesProceeds Repayments Net change in accrued interest payable and other liabilities The increase (decrease) during the reporting period in the total amount of accrued interest payable and other liabilities. lmst_IncreaseDecreaseInAccruedInterestReceivableAndOtherAssets Net change in accrued interest receivable and other assets The increase (decrease) during the reporting period in the total amount of accrued interest receivables and other assets. Financial Instrument [Axis] New loans and advances us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend Financing Receivable, Troubled Debt Restructuring, Commitment to Lend Agency mortgage-backed: residential, fair value lmst_EarningsPerShareBasicAndDilutedEstablishmentOfNetDeferredTaxAsset Earnings Per Share, Basic and Diluted, Establishment of Net Deferred Tax Asset The amount of benefit per basic and diluted share resulting from the establishment of a net deferred tax asset. Lessee, Operating Leases [Text Block] Agency mortgage-backed: residential, amortized cost us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance Loans, Notes, Trade and Other Receivables Disclosure [Text Block] lmst_ContributionToTierOneCapital Contribution to Tier One Capital The amount of contributions made to Tier 1 Capital as defined in the regulations. lmst_IncomeTaxExpenseBenefitFromNOLPerShare Income Tax Expense (Benefit) From NOL, Per Share Represents the amount per share of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to net operating loss carryforwards. lmst_IncomeTaxExpenseBenefitFromNOL Income Tax Expense (Benefit) From NOL Represents the amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to net operating loss carryforwards. Initial recognition of right-of-use lease assets Represents the value of right-of-use assets recognized in noncash transactions us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period LIABILITIES AND SHAREHOLDERS’ EQUITY us-gaap_Assets Total assets Total assets Plan Name [Axis] Plan Name [Domain] us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense Share-based Payment Arrangement, Expense, Tax Benefit us-gaap_DeferredIncomeTaxAssetsNet Deferred taxes, net Share-based Payment Arrangement [Text Block] Real estate acquired us-gaap_OtherAssets Other assets Award Type [Domain] us-gaap_EscrowDeposit Escrow Deposit Basis of Presentation and Significant Accounting Policies [Text Block] Award Type [Axis] Accumulated Amortization us-gaap_FiniteLivedIntangibleAssetsNet Standby Letters of Credit [Member] Kentucky Department of Revenue [Member] Information pertaining to Kentucky Department of Revenue. Core deposit intangibles, Gross Commitments and Contingencies Disclosure [Text Block] us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Accumulated depreciation Premises and equipment, net Goodwill Goodwill, Ending Balance Property, plant and equipment, gross Derivative Instrument [Axis] Derivative Contract [Domain] Securities available for sale Debt Securities, Available-for-sale, Total Total, fair value us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures Investment in subsidiary us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments Income before income taxes Income Before Income Taxes Income tax expense (benefit) Income Tax Expense (Benefit), Total Other real estate owned, gross us-gaap_MortgageLoansInProcessOfForeclosureAmount Mortgage Loans in Process of Foreclosure, Amount us-gaap_OtherRealEstateDisposals Proceeds from sale of properties us-gaap_DefinedContributionPlanCostRecognized Defined Contribution Plan, Cost us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Insurance expense Interest bearing deposits in banks us-gaap_CashAndCashEquivalentsAtCarryingValue Cash and cash equivalents Beginning cash and cash equivalents Ending cash and cash equivalents us-gaap_RealEstateOwnedValuationAllowanceAmountsApplied Real Estate Owned, Valuation Allowance, Amounts Applied Salaries and employee benefits Cash and due from banks Valuation adjustment write-downs Valuation adjustment write-downs Real Estate Owned [Text Block] Amendment Flag Use of Estimates, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] us-gaap_GainLossOnSaleOfPropertyPlantEquipment Net (gain) loss on sale of premises and equipment Net gain on sale Net gain on sales of other real estate owned Current Fiscal Year End Date us-gaap_FederalHomeLoanBankRegulatoryCapitalRequired Federal Home Loan Bank, Regulatory Capital, Required Document Fiscal Period Focus Net gain (loss) on sales and calls of investment securities Net realized (gain) loss on sales and calls of investment securities Document Fiscal Year Focus Consolidation, Policy [Policy Text Block] Document Period End Date Tier 1 capital (to average assets), actual ratio Tier 1 capital (to average assets), for capital adequacy purposes, ratio Entity Emerging Growth Company Tier 1 capital (to average assets), for minimum requirements to be well capitalized, ratio Document Type Total risk-based capital to risk-weighted assets, for minimum requirements to be well capitalized, ratio Entity Small Business Entity Shell Company us-gaap_CollateralizedAgreements Collateralized Agreements, Total Acquisition costs Document Information [Line Items] Document Information [Table] Total risk-based capital to risk-weighted assets, actual ratio Total risk-based capital to risk-weighted assets, for capital adequacy purposes, ratio Capital Required for Capital Adequacy to Risk Weighted Assets Entity Public Float Entity Filer Category Tier I capital to risk-weighted assets, actual ratio Entity Current Reporting Status Tier I capital to risk-weighted assets, for capital adequacy purposes, ratio Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Entity Voluntary Filers us-gaap_BusinessCombinationAcquisitionRelatedCosts Business Combination, Acquisition Related Costs Tier I capital to risk-weighted assets, for minimum requirements to be well capitalized, ratio Entity Well-known Seasoned Issuer Total risk-based capital to risk-weighted assets, actual amount Total risk-based capital to risk-weighted assets, for capital adequacy purposes, amount Total risk-based capital to risk-weighted assets, for minimum requirements to be well capitalized, amount Net write-down of other real estate owned Bank owned life insurance Bank Owned Life Insurance Tier 1 capital (to average assets), actual amount us-gaap_GoodwillImpairmentLoss Goodwill, Impairment Loss Tier 1 capital (to average assets), for capital adequacy purposes, amount Tier 1 capital (to average assets), for minimum requirements to be well capitalized, amount Schedule of Real Estate Properties [Table Text Block] Statement of Comprehensive Income [Abstract] Impairment on premises held for sale Entity Central Index Key Tier I capital to risk-weighted assets, actual amount Entity Registrant Name Tier I capital to risk-weighted assets, for capital adequacy purposes, amount Tier I capital to risk-weighted assets, for minimum requirements to be well capitalized, amount Entity [Domain] Legal Entity [Axis] us-gaap_AmortizationOfIntangibleAssets Amortization of Intangible Assets, Total Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] us-gaap_FinancingReceivableAllowanceForCreditLosses Balance Balance Regulatory Capital Requirements under Banking Regulations [Text Block] Other real estate owned OREO OREO Entity Common Stock, Shares Outstanding (in shares) Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] us-gaap_OtherForeclosedAssets Other Repossessed Assets Marketable Securities [Table Text Block] Loans, net of allowance of $8,376 and $8,880, respectively Loans, net Gross loans Total ending loans balance Professional fees Loans, allowance Less: Allowance for loan losses Total ending allowance balance Marketing expense Trading Symbol Transfer from premises and equipment to premises and equipment held for sale Transfer of amount classified as property, plant and equipment to property, plant and equipment attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer. Communications expense Data processing expense lmst_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpectedFutureCompensationCurrent 2020 The expected future compensation expense related to unvested shares for the next fiscal year. us-gaap_TableTextBlock Notes Tables Real Estate Owned, Valuation Allowance, Policy [Policy Text Block] us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearThree 2022 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearFour 2023 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearFive 2024 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterRollingYearFive Thereafter Risk Level, A Rated [Member] "A" rated risk level determined by a financial institution which provides risk ratings (Standard & Poor's, Moody's, Fitch, etc.) Risk Level, AA Rated [Member] "AA" rated risk level determined by a financial institution which provides risk ratings (Standard & Poor's, Moody's, Fitch, etc.) us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueInNextRollingTwelveMonths 2020 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearTwo 2021 Risk Level, Subject to Downgrade [Member] Risk level determined to be "subject to downgrade" by a financial institution which provides risk ratings (Standard & Poor's, Moody's, Fitch, etc.) Federal Home Loan Bank stock Risk Level, Below A Rated [Member] Below "A" rated risk level determined by a financial institution which provides risk ratings (Standard & Poor's, Moody's, Fitch, etc.) us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresRepaymentAndPenalties Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Repayment and Penalties us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged us-gaap_CashCashEquivalentsAndFederalFundsSold Cash and cash equivalents lmst_DeferredTaxAssetsBeforeValuationAllowance Net deferred tax assets before valuation allowance The amount of deferred tax assets, net of deferred tax liabilities, before the valuation allowance has been applied. Related Party Transaction [Axis] Related Party Transaction [Domain] Premises held for sale us-gaap_InterestExpense Interest expense us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Federal Home Loan Bank Advances, Disclosure [Text Block] Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank [Table Text Block] Junior subordinated debentures us-gaap_InterestExpenseJuniorSubordinatedDebentures Other intangible assets, net Subordinated capital note us-gaap_InterestExpenseSubordinatedNotesAndDebentures Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Two Deposits us-gaap_InterestExpenseDeposits Fair Value of Financial Instruments, Policy [Policy Text Block] 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2024 Finite-Lived Intangible Assets, Amortization Expense, Year Five Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Series E and Series F Preferred Stock [Member] Outstanding nonredeemable series E and series F preferred stock or outstanding series E preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. 2020 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Matched Contribution Equal to 50 of Next 5% [Member] Represents information about matched contribution equal to 50% of the next 5% of compensation contributed following the first 1%. Matched Contribution Equal to 100 of First 1% [Member] Represents information about matched contribution equal to 100% of first 1% of compensation contributed. us-gaap_FiniteLivedIntangibleAssetUsefulLife Finite-Lived Intangible Asset, Useful Life Earnings Per Share, Policy [Policy Text Block] lmst_DefinedBenefitPlanTerminationExpense Defined Benefit Plan, Termination Expense Represents the additional expense incurred as a result of termination of a plan. Interest expense lmst_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpectedFutureCompensationYearFourAndThereafter 2023 & thereafter The expected future compensation expense related to unvested shares in year four and thereafter. Comprehensive Income, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] us-gaap_InterestAndDividendIncomeOperating Interest income Other real estate owned expense Total Represents the total amount of other real estate owned expense. us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation Stock issued for share-based awards, net of withholdings to satisfy employee tax obligations upon award (in shares) Stock issued for share-based awards, net of withholdings to satisfy employee tax obligations upon award us-gaap_SharesIssuedPricePerShare Shares Issued, Price Per Share Share-based Payment Arrangement [Policy Text Block] Stockholders' Equity Note Disclosure [Text Block] 2023 us-gaap_TimeDepositMaturitiesYearFour 2024 us-gaap_TimeDepositMaturitiesYearFive Pension and Other Postretirement Plans, Nonpension Benefits, Policy [Policy Text Block] Taxable securities Thereafter us-gaap_TimeDepositMaturitiesAfterYearFive Tax exempt securities 2020 us-gaap_TimeDepositMaturitiesYearOne 2021 us-gaap_TimeDepositMaturitiesYearTwo 2022 us-gaap_TimeDepositMaturitiesYearThree Loans, including fees Restricted stock vesting Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the vesting of restricted stock. us-gaap_DeferredTaxAssetsValuationAllowance Valuation allowance lmst_DebtInstrumentFinancialCovenantsNonPerformingAssetsToTotalAssetsPercentageMinimum Debt Instrument, Financial Covenants, Non-performing Assets to Total Assets, Percentage, Minimum The minimum percentage of non-performing assets to total assets that are required to maintain pursuant to the debt agreement. Commitments and Contingencies, Policy [Policy Text Block] lmst_DebtInstrumentFinancialConvenantsMinimumCashOnHand Debt Instrument, Financial Convenants, Minimum Cash on Hand The minimum cash that is required to hold on hand pursuant to the debt agreement. lmst_DebtInstrumentFinancialConvenantsMinimumRiskBasedCapitalToRiskWeightedAssets Debt Instrument, Financial Convenants, Minimum Risk Based Capital to Risk Weighted Assets The minimum risk based capital to risk weighted assets ratio that are required to maintain pursuant to the debt agreement. Limestone Bank [Member] Limestone Bank. Interest income Gross gains This item represents the gross profit realized on the sale of debt or equity securities. Gross losses This item represents the gross loss realized on the sale of debt or equity securities. us-gaap_DeferredTaxAssetsLiabilitiesNet Net deferred tax assets Other Goodwill and Intangible Assets, Policy [Policy Text Block] us-gaap_DeferredTaxAssetsGross us-gaap_DeferredIncomeTaxLiabilities Certificates of deposit Interest checking Other us-gaap_NoninterestIncomeOtherOperatingIncome Other income Noninterest Income, Total Non-interest income revenue Revenue from Contract with Customer, Including Assessed Tax Net assets from acquisitions Net unrealized loss on securities us-gaap_TimeDepositsAtOrAboveFDICInsuranceLimit Time Deposits, at or Above FDIC Insurance Limit Income from bank owned life insurance Deposit Liabilities Disclosures [Text Block] Non-interest income us-gaap_DeferredTaxAssetsStateTaxes Deferred Tax Assets, State Taxes us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss Net interest income after negative provision for loan losses Negative provision for loan losses Provision For Loan Losses Accrued expenses us-gaap_PropertyPlantAndEquipmentUsefulLife Property, Plant and Equipment, Useful Life us-gaap_InterestIncomeExpenseNet Net interest income Net Interest Income Allowance for loan losses Furniture and Fixtures [Member] Building [Member] Land and Building [Member] AOCI component of transfer from held to maturity to available for sale, net of tax The amount of AOCI effect from transfers to investments. Property, Plant and Equipment, Policy [Policy Text Block] Alternative minimum tax credit carry-forward Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax Property, Plant and Equipment, Type [Axis] New market tax credit carry-forward Property, Plant and Equipment, Type [Domain] us-gaap_SaleOfStockConsiderationReceivedOnTransaction Sale of Stock, Consideration Received on Transaction Deposit Account [Member] Net operating loss carry-forward Debit Card [Member] Deferred tax assets: Assets Private Placement [Member] us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash from financing activities Loan Commitments, Policy [Policy Text Block] Transfers and Servicing of Financial Assets, Policy [Policy Text Block] Sale of Stock [Axis] Sale of Stock [Domain] us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash from operating activities Other us-gaap_DeferredTaxLiabilitiesOther us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash from investing activities us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease Net change in cash and cash equivalents Net change in cash and cash equivalents Derivatives, Policy [Policy Text Block] us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations Net cash used in investing activities FHLB stock dividends us-gaap_DeferredTaxLiabilitiesInvestments Investment, Policy [Policy Text Block] Net unrealized gain on securities Allowance for loan losses allocated, with an allowance recorded Impaired Financing Receivable, Related Allowance us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation Common shares withheld for taxes Common shares withheld for taxes Fixed assets us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment Cash basis interest income recognized, with no related allowance recorded Cash basis interest income recognized, with an allowance recorded Cash basis interest income recognized Interest income recognized, with no related allowance recorded Interest income recognized, with an allowance recorded Deferred tax liabilities: Interest income recognized, total Recorded investment, with no related allowance recorded Recorded investment, with an allowance recorded Impaired Financing Receivable, with Related Allowance, Recorded Investment Recorded investment, total Average recorded investment, with no related allowance recorded Average recorded investment, with an allowance recorded Average recorded investment, total us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock Payments for Repurchase of Preferred Stock and Preference Stock Unpaid principal balance, with no related allowance recorded Unpaid principal balance, with an allowance recorded Unpaid principal balance, total us-gaap_OtherNoninterestExpense Other Other expense us-gaap_NoninterestExpense Scenario [Domain] us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability lmst_IncreaseDecreaseInCashSurrenderValueOfBankOwnedLifeInsuranceNet Increase in cash surrender value of life insurance, net of premium expense The amount of increase (decrease) during the period in the cash surrender value of bank owned life insurance, net of premium expense. Forecast [Member] FDIC insurance us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total Net operating loss Deferred Proceeds from issuance of common stock, net Proceeds from issuance of common stock Establish state deferred tax asset Scenario [Axis] Non-interest expense Collateral [Domain] us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock Redemption of preferred stock Collateral [Axis] Current Class of Financing Receivable [Domain] Construction Loans [Member] Commercial Real Estate Portfolio Segment [Member] Class of Financing Receivable [Axis] Financing Receivable Portfolio Segment [Domain] Commercial Portfolio Segment [Member] Residential Portfolio Segment [Member] Consumer Portfolio Segment [Member] Financing Receivable Portfolio Segment [Axis] Other comprehensive income (loss): Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] State and Local Jurisdiction [Member] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Domain] Income Tax Authority [Axis] Income Tax Authority [Domain] Domestic Tax Authority [Member] Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Financing Receivable, Held-for-investment [Policy Text Block] Revenue from Contract with Customer [Text Block] us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings Repayment of Federal Home Loan Bank advances Cash and Cash Equivalents, Policy [Policy Text Block] us-gaap_RepaymentsOfSubordinatedDebt Repayment of subordinated capital note us-gaap_UnrecognizedTaxBenefits Unrecognized Tax Benefits, Ending Balance Schedule of Subordinated Borrowing [Table Text Block] Accounting Policies [Abstract] us-gaap_EarlyRepaymentOfSeniorDebt Early Repayment of Senior Debt Subordinated Borrowing [Axis] us-gaap_RepaymentsOfSeniorDebt Repayment of senior debt Repayment of senior debt Subordinated Borrowing, Name [Domain] Subordinated Borrowings Disclosure [Text Block] Proceeds from senior debt Proceeds from senior debt Proceeds from issuance of subordinated capital note Proceeds from Issuance of Subordinated Long-term Debt Condensed Financial Information of Parent Company Only Disclosure [Text Block] Advances from Federal Home Loan Bank Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Postage and delivery Amount of expense associated with postage and other delivery services. Accrued interest payable and other liabilities Accrued expenses and other liabilities us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Weighted average common shares and potential common shares (in shares) Basic and diluted income per common share (in dollars per share) us-gaap_OperatingLossCarryforwards Operating Loss Carryforwards, Total Asset Class [Axis] Asset Class [Domain] Statement of Financial Position [Abstract] Diluted income per common share (in dollars per share) Earnings Per Common Share Diluted (in dollars per share) Weighted average shares outstanding (in shares) Banking Subsidiary [Member] Represents the banking subsidiary segment. Non-voting Noncumulative Non-convertible Series F Perpetual Preferred Stock [Member] Represents information about non-voting noncumulative non-convertible series F perpetual preferred stock. Federal Home Loan Bank Stock, Policy [Policy Text Block] Disclosure of accounting policy for federal home loan bank stock. Business Acquisition [Axis] Basic income per common share (in dollars per share) Earnings Per Common Share Basic (in dollars per share) Business Acquisition, Acquiree [Domain] All Other Subsidiaries [Member] Represents all other subsidiaries. Dividend Policy, [Policy Text Block] Disclosure of accounting policy for dividend. lmst_AvailableForSaleSecuritiesRealizedGainLossIncomeTaxExpenseBenefit Available for Sale Securities, Realized Gain (Loss), Income Tax Expense (Benefit) The tax provision related to net gains and losses realized on sale of available-for-sale securities. Statement of Cash Flows [Abstract] Bank Owned Life Insurance, Policy [Policy Text Block] Disclosure of accounting policy for bank owned life insurance. Statement of Stockholders' Equity [Abstract] Financing Receivable, Nonaccrual [Table Text Block] Quarterly Financial Information [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Unrealized Loss on Investments [Table Text Block] Net change in deposits lmst_CorrespondentFinancialInstitutionsAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds Correspondent Financial Institutions Advances General Debt Obligations Disclosures Amount Of Available Unused Funds Amount of maximum federal funds line of credit available on a secured basis from a correspondent institution. 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Valuation, Cost Approach [Member] lmst_DefinedBenefitPlanVestingPeriod Defined Benefit Plan Vesting Period The vesting period of defined benefit plan. Series E Preferred Stock [Member] Series F Preferred Stock [Member] Payable to Porter Statutory Trust IV [Member] Information pertaining to payables to Porter Statutory Trust IV. Payable to Ascencia Statutory Trust I [Member] Information pertaining to payables to Ascencia Statutory Trust I. Payable to Porter Statutory Trust II [Member] Information pertaining to payables to Porter Statutory Trust II. Payable to Porter Statutory Trust III [Member] Information pertaining to payables to Porter Statutory Trust III. 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Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Earnings allocated to unvested shares Reclassification of disproportionate tax effect due to change in federal tax rate The amount of reclassification of tax effect from accumulated other comprehensive income. Federal Home Loan Bank advances Total advances from the Federal Home Loan Bank Net income Net income Net income Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Domain] Performing Financial Instruments [Member] Nonperforming Financial Instruments [Member] Loans Past Due 90 Days and Over Still Accruing Kentucky Municipalities [Member] Information pertaining to Kentucky municipalities. Financing Receivable Credit Quality Indicators [Table Text Block] Past due Warrant [Member] Nonaccrual Financial Asset, 30 to 59 Days Past Due [Member] Antidilutive Securities [Axis] Financial Asset, 60 to 89 Days Past Due [Member] Antidilutive Securities, Name [Domain] Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Financing Receivable, Past Due [Table Text Block] Financial Asset, Period Past Due [Axis] Financial Asset, Period Past Due [Domain] Proceeds from sale of other real estate owned Business Combination Disclosure [Text Block] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRate Federal Home Loan Bank, Advances, Weighted Average Interest Rate Proceeds from mandatory redemption of Federal Home Loan Bank stock us-gaap_RelatedPartyDepositLiabilities Related Party Deposit Liabilities Cash flows from investing activities Earnings Per Share [Text Block] us-gaap_IncreaseDecreaseInOtherOperatingLiabilities Net change in other liabilities lmst_JuniorSubordinatedDebtFairValueDisclosure Junior subordinated debentures Fair value of junior subordinated debt obligations. us-gaap_RelatedPartyTransactionAmountsOfTransaction Related Party Transaction, Amounts of Transaction Related Party Transactions Disclosure [Text Block] Schedule of Related Party Transactions [Table Text Block] lmst_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedIntrinsicValue1 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Nonvested Intrinsic Value1 The fair value of non-vested equity-based payment instruments, excluding stock (or unit) options, issued as of the balance sheet date. us-gaap_DebtInstrumentTerm Debt Instrument, Term Loans individually evaluated for impairment Loans collectively evaluated for impairment Individually evaluated for impairment Collectively evaluated for impairment Impaired loans, measurement input Impaired Loans, Measurement Input Value of input used to measure impaired loans. 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Commercial Real Estate Property [Member Information pertaining to commercial real estate property. Other real estate owned, fair value Fair value portion of other real estate owned. Debt Instrument [Axis] Debt Instrument, Name [Domain] London Interbank Offered Rate (LIBOR) [Member] Variable Rate [Domain] Variable Rate [Axis] Stock-based compensation expense Quarterly Financial Information [Text Block] us-gaap_StockRedeemedOrCalledDuringPeriodValue Redemption and retirement of preferred shares us-gaap_StockRedeemedOrCalledDuringPeriodShares Redemption and retirement of preferred shares (in shares) lmst_InterestExpenseSeniorDebt Senior debt Amount of interest expense on senior debt. 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Leased Right-of-use Asset [Member] Represents leased right-of-use asset. us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total minimum lease payments us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions Equity in undistributed subsidiary income Equity in undistributed subsidiary (income) loss us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Discount effect of cash flows us-gaap_DeferredIncomeTaxExpenseBenefit Deferred taxes, net Measurement Input Type [Axis] us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree 2022 Measurement Input Type [Domain] us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour 2023 us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive 2024 Total, Gross Amount before accumulated amortization of intangible assets, including goodwill. us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive Thereafter us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths 2020 us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo 2021 Valuation Approach and Technique [Axis] Lease liability Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from lease liability. Valuation Approach and Technique [Domain] Valuation, Income Approach [Member] Lease right-of-use assets Amount of deferred tax liability attributable to taxable temporary differences from lease right-of-use assets. Schedule of Troubled Debt Restructurings Postmodification[Table Text Block] Tabular disclosure of troubled debt restructurings postmodification. Proceeds from calls of held to maturity securities The cash inflow associated with the calls (requests for early payments) of debt securities designated as held-to-maturity. Stock-based compensation expense us-gaap_ShareBasedCompensation Share-based Payment Arrangement, Noncash Expense, Total Lessee, Operating Lease, Liability, Maturity [Table Text Block] Certain Banking Centers, Performing Loans, and Customer Deposits from Republic Bank and Trust [Member] Information related to the acquisition of four branch banking centers, certain performing loans, and certain customer deposits from Republic Bank and Trust. Proceeds from maturities of held to maturity securities The cash inflow associated with the maturity of debt securities designated as held-to-maturity. lmst_EffectiveIncomeTaxRateReconciliationStateDeferredTaxAsset Establish state deferred tax asset Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state deferred tax asset. lmst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoans Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans The amount of loans recognized as of the acquisition date. lmst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits The amount of deposits assumed (as defined) which have been recognized as of the acquisition date. lmst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestPayableAndOtherLiabilities Accrued interest payable and other liabilities The amount of accrued interest payable and other liabilities assumed (as defined) which have been recognized as of the acquisition date. lmst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestReceivableAndOtherAssets Accrued interest receivable and other assets The amount of accrued interest receivable and other assets recognized as of the acquisition date. lmst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLeasedRightOfUseAsset Leased right-of-use asset The amount of leased right-of-use asset recognized as of the acquisition date. 2018 Omnibus Equity Compensation Plan [Member] And equity incentive plan created in 2018. us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments Net amortization on securities lmst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansOtherAdjustments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Other Adjustments The amount of other adjustments to loans recognized as of the acquisition date. lmst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansCreditAdjustment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Credit Adjustment The credit adjustment amount for loans recognized as of the acquisition date. lmst_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansBookBalanceValue Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Book Balance Value The book balance value amount of loans recognized as of the acquisition date. us-gaap_Depreciation Depreciation, Total Depreciation and amortization Non-voting shares converted to voting (in shares) lmst_CapitalConservationBuffer Capital Conservation Buffer The capital conservation buffer that must be maintained by the bank, above certain other regulatory capital requirements. us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure Federal Home Loan Bank advances lmst_CapitalConservationBufferAnnualPhasein Capital Conservation Buffer, Annual Phase-In The annual phase-in percentage of the capital conservation buffer that requires the bank to hold capital above certain regulatory requirements. us-gaap_CashAndCashEquivalentsFairValueDisclosure Cash and cash equivalents Fair Value, Nonrecurring [Member] Common stock, no par, 39,000,000 shares authorized, 6,251,975 and 6,242,720 voting, and 1,220,000 and 1,220,000 non-voting shares issued and outstanding, respectively us-gaap_GainLossOnSaleOfLoansAndLeases Net gain on sales of loans held for sale Senior Notes [Member] Adjustments to reconcile net income (loss) to net cash from operating activities Measurement Frequency [Axis] Measurement Frequency [Domain] Fair Value, Recurring [Member] Common stock, shares authorized (in shares) Common stock, shares issued (in shares) Common stock, par value (in dollars per share) Restatement [Axis] Restatement [Domain] Restatement Adjustment [Member] Statistical Measurement [Domain] Maximum [Member] Minimum [Member] Weighted Average [Member] Ownership [Domain] Product and Service [Axis] Product and Service [Domain] Statistical Measurement [Axis] Investment, Name [Domain] us-gaap_OperatingLeasesRentExpenseNet Operating Leases, Rent Expense, Net, Total us-gaap_PreferredStockLiquidationPreferenceValue Preferred Stock, Liquidation Preference, Value Ownership [Axis] Interest paid Investment, Name [Axis] Property, Plant and Equipment Disclosure [Text Block] Property, Plant and Equipment [Table Text Block] Portion at Fair Value Measurement [Member] [Default] Estimate of Fair Value Measurement [Member] Measurement Basis [Axis] Fair Value, Inputs, Level 3 [Member] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] us-gaap_PreferredStockRedemptionPricePerShare Preferred Stock, Redemption Price Per Share Fair Value Hierarchy and NAV [Axis] Premises and Equipment [Member] Premises and equipment used in the normal conduct of business. us-gaap_PreferredStockDividendRatePercentage Preferred Stock, Dividend Rate, Percentage Cash flows from operating activities Statement [Line Items] Additional paid-in capital Accrued interest receivable and other assets Financial Instrument off Balance Sheet Risk, Amount Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability AOCI Attributable to Parent [Member] Stockholders’ equity us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure Federal Home Loan Bank stock Voting Common Stock [Member] Related to voting common stock. Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block] Federal Home Loan Bank advances lmst_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvances Interest expense incurred during the reporting period on borrowings associated with Federal Home Loan Bank and Federal Reserve Bank advances. Federal funds sold and other The aggregate interest income earned from (1) the lending of excess federal funds to other commercial banks, (2) securities purchased under agreements to resell, (3) interest-bearing balances with other financial institutions, and (4) FHLB stock. us-gaap_LoansReceivableFairValueDisclosure Loans, net State franchise and deposit tax Represents the state franchise and deposit tax. Occupancy and equipment Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense and equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses. Litigation and loan collection expense Fees charged for services from professionals for collecting loan payments from customers who have defaulted on their loans. Fair Value Disclosures [Text Block] Fair Value, by Balance Sheet Grouping [Table Text Block] Amortization during the period of net unrealized loss transferred to held to maturity The other comprehensive income loss amortization of net unrealized gain (loss) on transfers to held to maturity from available for sale securities before tax. lmst_StateFranchiseTaxPercent State Franchise Tax, Percent Represents the franchise tax rate, assessed as a percentage of average capital. lmst_PaymentsForProceedsFromLoanOriginationsAndPrincipalCollections Net changes in loans The net cash outflow or inflow related to a loan origination (the process when securing a mortgage for a piece of real property), lease origination, and principal collections. us-gaap_Liabilities Total liabilities Commitments and contingent liabilities (Note 18) Postemployment Benefits Disclosure [Text Block] us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent Liability, Other Postretirement Defined Benefit Plan Accounting Standards Update 2014-09 [Member] lmst_EarningOnBankOwnedLifeInsurance Earning on Bank Owned Life Insurance The income earned from the cash surrender value of life insurance. Accounting Standards Update 2016-02 [Member] Parent Company [Member] Subsidiaries [Member] Consolidated Entities [Axis] Consolidated Entities [Domain] Type of Adoption [Domain] Adjustments for New Accounting Pronouncements [Axis] Condensed Cash Flow Statement [Table Text Block] Condensed Balance Sheet [Table Text Block] Condensed Income Statement [Table Text Block] Retained Earnings [Member] Short-term advances from the FHLB, fixed rate Rate of Federal Home Loan Bank (FHLB) advances which have fixed interest rates maturing in the next fiscal year following the latest fiscal year. Long term advances from the FHLB, fixed rate Rate of Federal Home Loan Bank (FHLB) advances which have fixed interest rates maturing after the latest fiscal year. Additional Paid-in Capital [Member] Common Stock [Member] Preferred Stock [Member] Equity Components [Axis] Equity Component [Domain] Long term advances (fixed rates 0.00% to 5.24%) maturing April 2020 to August 2033 us-gaap_LongTermDebt Debt Other Liabilities [Member] us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 Class of Warrant or Right, Exercise Price of Warrants or Rights Other Assets [Member] us-gaap_SeniorNotes Senior debt PBI Bank [Member] The legal entity PBI Bank. Junior subordinated debentures us-gaap_LineOfCredit Long-term Line of Credit, Total lmst_ConcentrationRiskNumber Concentration Risk Number Represents the number of holdings of securities by any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of stockholders' equity. us-gaap_SubordinatedDebt Subordinated capital note Balance Sheet Location [Axis] Balance Sheet Location [Domain] lmst_FinancingReceivableModificationsPercentageOfPerformingTdrsToTotalTdrs Financing Receivable Modifications Percentage of Performing TDRs to Total TDRs The ratio of performing troubled debt restructurings to total troubled debt restructurings. lmst_MinimumOutstandingBalanceForLoansToBeQualifiedForCreditRiskAnalysis Minimum Outstanding Balance for Loans to be Qualified for Credit Risk Analysis The minimum outstanding balance for loans to be qualified for credit risk analysis. Entity Interactive Data Current lmst_TroubledDebtRestructuringReserve Troubled Debt Restructuring Reserve The troubled debt restructuring reserve. Nonfarm Nonresidential [Member] Related to Nonfarm Nonresidential loans. Farmland Loans [Member] Related to farmland loans. Multifamily Loans [Member] Related to multifamily loans. Agriculture Portfolio Segment [Member] Related to the agriculture portfolio segment. Short term advances (fixed rates 1.66% to 1.76%) maturing January 2020 One- to Four-family Residential Properties [Member] Related to one to four family residential properties loans. Title of 12(b) Security Other Portfolio Segment [Member] Related to the other portfolio segment. Impairment Evaluation of Financing Receivables [Table Text Block] Impairment Evaluation of Financing Receivables. us-gaap_DepositsFairValueDisclosure Deposits Real Estate, Type of Property [Axis] Real Estate [Domain] us-gaap_PaymentsToAcquireAvailableForSaleSecurities Investments in subsidiaries Proceeds from sales and calls of available for sale securities Total past due and nonaccrual The recorded investment on nonaccrual status and past due financing receivables. Watch [Member] Related to watch rating. Construction, Land Development, and Other Land Loans [Member] Related to construction land development and other land loans. Operating expense The foreclosed real estate operating expense. Schedule of Expenses Related to Foreclosed Real Estate [Table Text Block] The tabular disclosure for the activity during the period relating to other real estate owned. Statement [Table] us-gaap_MinorityInterestOwnershipPercentageByParent Noncontrolling Interest, Ownership Percentage by Parent Schedule of Deposits [Table Text Block] The tabular disclosure of deposit balances by category. Schedule of Maturities of Time Deposits [Table Text Block] The tabular disclosure of maturities for time deposits. Routine Real Estate Collateral [Member] Related to routine real estate collateral. Thin Trading Market or Specialized Collateral [Member] Related to thin trading market or specialized collateral. Impaired Loans [Member] Related to impaired loans. Income Statement [Abstract] lmst_ImpairedFinancingReceivableProvisionForLoanLosses Impaired Financing Receivable Provision for Loan Losses Represents the provision for loan losses on impaired loans. Measured for Impairment Using Fair Value of Collateral [Member] Related to the measurement used for impairment using fair value for collateral. Total Total deposits Interest bearing Non-interest bearing Non-interest bearing us-gaap_TimeDeposits Money market Fair Value Assets Measured on Nonrecurring Basis Unobservable Input Reconciliation [Table Text Block] Fair Value, Assets Measured on Nonrecurring Basis, Unobservable Input Reconciliation. Less reclassification adjustment for gains (losses) included in net income (loss) Savings Unrealized gain (loss) arising during the period Deposits Transfer of investment securities from held to maturity to available for sale lmst_AccruedInterestReceivableFairValue Accrued interest receivable Represents the fair value of accrued interest receivable. lmst_AccruedInterestPayableFairValue Accrued interest payable Represents the fair value of accrued interest payable. Subordinated capital note The fair value of subordinated capital notes. lmst_CommonStockOwnershipPercentage Common Stock Ownership Percentage The minimum aggregate ownership percentage that would limit the company's ability to utilize its NOL. lmst_CommonStockOwnershipPercentageByIndividual Common Stock Ownership Percentage by Individual The minimum individual shareholder's ownership percentage that would limit the company's ability to utilize its NOL. lmst_DividendDeclaredPreferredStockPurchaseRightPerEachShareOfCommonStock Dividend Declared Preferred Stock Purchase Right Per Each Share of Common Stock The number of preferred stock purchase rights for each share of common stock outstanding declared as a dividend. OREO write-down Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from impairment losses. Nonaccrual loan interest Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from nonaccrual interest on loans. Non-Employee Directors Stock Incentive Plan 2006 [Member] Related to the nonemployee directors stock incentive plan. Unvested Shares [Member] Related to unvested shares. us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue Security Owned and Pledged as Collateral, Fair Value, Total lmst_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualAwardToNonEmployeeDirectorsValue Share-based Compensation Arrangement by Share-based Payment Award, Annual Award to Non Employee Directors, Value Represents the fair market value of the annual awards to each non-employee director. Unused lines of Credit [Member] us-gaap_StockholdersEquity Total common stockholders’ equity Shareholders’ equity Balances Balances lmst_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpectedFutureCompensationYearTwo 2021 The expected future compensation expense related to unvested shares in year two. lmst_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpectedFutureCompensationYearThree 2022 The expected future compensation expense related to unvested shares in year three. us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax Available for sale securities, gross unrealized losses Available for sale securities, gross unrealized gains lmst_MaximumAssetForOptOutRequirementInCapitalCalculation Maximum Asset for Opt Out Requirement in Capital Calculation For banks and their holding companies with less than $250 billion in assets, a one-time opportunity to opt-out of a requirement to include unrealized gains and losses in accumulated other comprehensive income in the capital calculation was allowed. Available for sale securities, amortized cost Total, amortized cost One to five years, amortized cost Five to ten years, amortized cost Beyond ten years, amortized cost