$JMSB
John Marshall Bancorp, Inc. Stock $jmsb

$jmsb Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000155837024003634 Filed on March 20, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$26.92M		$100.8M
YoY Change	14.78%		19.87%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$112.0K	$124.0K	$484.0K
YoY Change	-4.27%	-2.36%	-13.11%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$15.18M		$50.29M
YoY Change	68.91%		268.53%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$5.414M	$5.879M	$7.981M
YoY Change	-32.65%	-44.53%	-80.08%
Income Tax	$1.210M	$1.377M	$2.823M
% Of Pretax Income	22.35%	23.42%	35.37%
Net Earnings	$4.204M	$4.487M	$5.158M
YoY Change	-33.31%	-45.07%	-83.78%
Net Earnings / Revenue	15.62%		5.12%
Basic Earnings Per Share	$0.30		$0.37
Diluted Earnings Per Share	$0.30	$0.32	$0.36
COMMON SHARES
Basic Shares Outstanding	14.17M	14.13M	14.08M
Diluted Shares Outstanding	14.18M		14.15M

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$153.0M	$99.01M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$5.116M	$1.281M	$5.457M
YoY Change	252.58%	5.09%	-6.4%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$2.252B	$2.243B	$2.243B
YoY Change	-4.23%	-4.5%	-4.5%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$2.949M	$4.559M	$4.559M
YoY Change	203.4%	340.48%	340.48%
Accrued Expenses	$4.141M	$4.446M	$4.446M
YoY Change	-17.82%	-8.48%	-8.48%
Deferred Revenue
YoY Change
Short-Term Debt	$77.00M	$54.00M
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$7.090M	$9.005M	$9.005M
YoY Change	17.95%	52.81%	52.81%
LONG-TERM LIABILITIES
Long-Term Debt	$24.73M	$24.71M	$24.71M
YoY Change	0.34%	0.34%	0.34%
Other Long-Term Liabilities	$7.478M	$8.322M	$8.322M
YoY Change	-33.15%	-28.74%	-28.74%
Total Long-Term Liabilities	$32.21M	$33.03M	$33.03M
YoY Change	-10.11%	-9.01%	-9.01%
TOTAL LIABILITIES
Total Short-Term Liabilities	$7.090M	$9.005M	$9.005M
Total Long-Term Liabilities	$32.21M	$33.03M	$33.03M
Total Liabilities	$2.017B	$2.013B	$2.013B
YoY Change	-5.31%	-5.75%	-5.75%
SHAREHOLDERS EQUITY
Retained Earnings	$150.6M	$146.4M
YoY Change	-0.03%	-0.17%
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$234.6M	$229.9M	$229.9M
YoY Change
Total Liabilities & Shareholders Equity	$2.252B	$2.243B	$2.243B
YoY Change	-4.23%	-4.5%	-4.5%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$4.204M	$4.487M	$5.158M
YoY Change	-33.31%	-45.07%	-83.78%
Depreciation, Depletion And Amortization	$112.0K	$124.0K	$484.0K
YoY Change	-4.27%	-2.36%	-13.11%
Cash From Operating Activities	$175.0K	$5.434M	$18.00M
YoY Change	-97.09%	-32.01%	-45.7%
INVESTING ACTIVITIES
Capital Expenditures	$75.00K	$132.0K	$612.0K
YoY Change	-81.25%	842.86%	292.31%
Acquisitions
YoY Change
Other Investing Activities	$45.82M	-$33.92M	$145.4M
YoY Change	13.32%	-33.53%	-153.73%
Cash From Investing Activities	$45.74M	-$34.06M	$144.8M
YoY Change	14.26%	-33.27%	-153.47%
FINANCING ACTIVITIES
Cash Dividend Paid			$3.108M
YoY Change			11.04%
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	8.092M	-65.03M	-125.4M
YoY Change	-288.8%	-317.54%	-164.82%
NET CHANGE
Cash From Operating Activities	175.0K	5.434M	18.00M
Cash From Investing Activities	45.74M	-34.06M	144.8M
Cash From Financing Activities	8.092M	-65.03M	-125.4M
Net Change In Cash	54.01M	-93.66M	37.41M
YoY Change	29.34%	611.89%	-184.63%
FREE CASH FLOW
Cash From Operating Activities	$175.0K	$5.434M	$18.00M
Capital Expenditures	$75.00K	$132.0K	$612.0K
Free Cash Flow	$100.0K	$5.302M	$17.39M
YoY Change	-98.22%	-33.54%	-47.3%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0001710482
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2022Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2023Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#InterestReceivable
CY2023Q4	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List FinancingReceivableAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#InterestReceivable
CY2023Q4	us-gaap	Debt Securities Held To Maturity Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2023#InterestReceivable
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Document Type DocumentType	10-K
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	001-41315
CY2023	dei	Entity Registrant Name EntityRegistrantName	John Marshall Bancorp, Inc.
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	VA
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	81-5424879
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	1943 Isaac Newton Square
CY2023	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 100
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Reston
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	VA
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	20190
CY2023	dei	City Area Code CityAreaCode	703
CY2023	dei	Local Phone Number LocalPhoneNumber	584-0840
CY2023	dei	Security12b Title Security12bTitle	Common Stock, $0.01 par value per share
CY2023	dei	Trading Symbol TradingSymbol	JMSB
CY2023	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2023	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2023	dei	Entity Filer Category EntityFilerCategory	Non-accelerated Filer
CY2023	dei	Entity Small Business EntitySmallBusiness	true
CY2023	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	true
CY2023	dei	Entity Ex Transition Period EntityExTransitionPeriod	true
CY2023	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	false
CY2023	dei	Document Fin Stmt Error Correction Flag DocumentFinStmtErrorCorrectionFlag	false
CY2023	dei	Entity Shell Company EntityShellCompany	false
CY2023Q2	dei	Entity Public Float EntityPublicFloat	247900000
CY2024Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	14171106
CY2023	dei	Auditor Name AuditorName	Yount, Hyde & Barbour, P.C.
CY2023	dei	Auditor Location AuditorLocation	Richmond, Virginia
CY2023Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	7424000
CY2023Q4	us-gaap	Other Liabilities OtherLiabilities	8322000
CY2022Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	6583000
CY2023Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	91581000
CY2022Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	55016000
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	99005000
CY2022Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	61599000
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	169993000
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	357576000
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	79532000
CY2022Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	81161000
CY2023Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	95505000
CY2022Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	99415000
CY2023Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	95505000
CY2022Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	99415000
CY2023Q4	us-gaap	Restricted Investments RestrictedInvestments	5012000
CY2022Q4	us-gaap	Restricted Investments RestrictedInvestments	4425000
CY2023Q4	us-gaap	Equity Securities Fv Ni Current And Noncurrent EquitySecuritiesFvNiCurrentAndNoncurrent	2792000
CY2022Q4	us-gaap	Equity Securities Fv Ni Current And Noncurrent EquitySecuritiesFvNiCurrentAndNoncurrent	2115000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	1859967000
CY2022Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1789508000
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest Noncurrent FinancingReceivableAllowanceForCreditLossExcludingAccruedInterestNoncurrent	19543000
CY2022Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	20208000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	1840424000
CY2022Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	1769300000
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1281000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1219000
CY2023Q4	us-gaap	Interest Receivable InterestReceivable	6110000
CY2022Q4	us-gaap	Interest Receivable InterestReceivable	5531000
CY2022Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	21170000
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	4176000
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	4611000
CY2023Q4	us-gaap	Other Assets OtherAssets	18251000
CY2022Q4	us-gaap	Other Assets OtherAssets	21274000
CY2023Q4	us-gaap	Assets Assets	2242549000
CY2022Q4	us-gaap	Assets Assets	2348235000
CY2023Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	411374000
CY2022Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	476697000
CY2023Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	607971000
CY2022Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	691945000
CY2023Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	52061000
CY2022Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	95241000
CY2023Q4	us-gaap	Time Deposits TimeDeposits	835194000
CY2022Q4	us-gaap	Time Deposits TimeDeposits	803857000
CY2023Q4	us-gaap	Deposits Deposits	1906600000
CY2022Q4	us-gaap	Deposits Deposits	2067740000
CY2023Q4	us-gaap	Federal Funds Purchased FederalFundsPurchased	10000000
CY2022Q4	us-gaap	Federal Funds Purchased FederalFundsPurchased	25500000
CY2023Q4	jmsb	Federal Reserve Bank Borrowings FederalReserveBankBorrowings	54000000
CY2023Q4	us-gaap	Subordinated Debt SubordinatedDebt	24708000
CY2022Q4	us-gaap	Other Liabilities OtherLiabilities	11678000
CY2022Q4	us-gaap	Subordinated Debt SubordinatedDebt	24624000
CY2023Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	4559000
CY2022Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	1035000
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	4446000
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	4858000
CY2023Q4	us-gaap	Liabilities Liabilities	2012635000
CY2022Q4	us-gaap	Liabilities Liabilities	2135435000
CY2022Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2022Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	1000000
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	1000000
CY2022Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2023Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	95636000
CY2022Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	94726000
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	146388000
CY2022Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	146630000
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-12251000
CY2022Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-28697000
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	229914000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	212800000
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2242549000
CY2022Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2348235000
CY2023	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	86435000
CY2022	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	74281000
CY2023	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	7206000
CY2022	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	7934000
CY2023	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	53000
CY2022	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	120000
CY2023	us-gaap	Dividend Income Operating DividendIncomeOperating	300000
CY2022	us-gaap	Dividend Income Operating DividendIncomeOperating	249000
CY2023	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	6776000
CY2022	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	1482000
CY2023	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	100770000
CY2022	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	84066000
CY2023	us-gaap	Interest Expense Deposits InterestExpenseDeposits	47168000
CY2022	us-gaap	Interest Expense Deposits InterestExpenseDeposits	11778000
CY2023	us-gaap	Interest Expense Federal Funds Purchased InterestExpenseFederalFundsPurchased	15000
CY2022	us-gaap	Interest Expense Federal Funds Purchased InterestExpenseFederalFundsPurchased	15000
CY2023	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Short Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm	67000
CY2022	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Short Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm	42000
CY2023	jmsb	Interest Expense Federal Reserve Bank Advances Short Term InterestExpenseFederalReserveBankAdvancesShortTerm	1640000
CY2023	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	1396000
CY2022	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	1810000
CY2023	us-gaap	Interest Expense InterestExpense	50286000
CY2022	us-gaap	Interest Expense InterestExpense	13645000
CY2023	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	50484000
CY2022	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	70421000
CY2023	jmsb	Provision For Loan Lease Unfunded Commitments And Other Losses ProvisionForLoanLeaseUnfundedCommitmentsAndOtherLosses	-3252000
CY2022	jmsb	Provision For Loan Lease Unfunded Commitments And Other Losses ProvisionForLoanLeaseUnfundedCommitmentsAndOtherLosses	175000
CY2023	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	53736000
CY2022	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	70246000
CY2023	us-gaap	Investment Banking Revenue InvestmentBankingRevenue	330000
CY2022	us-gaap	Investment Banking Revenue InvestmentBankingRevenue	324000
CY2023	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	224000
CY2022	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	544000
CY2023	jmsb	Other Service Charges And Fees OtherServiceChargesAndFees	838000
CY2022	jmsb	Other Service Charges And Fees OtherServiceChargesAndFees	656000
CY2023	us-gaap	Gain Loss On Investments GainLossOnInvestments	-17316000
CY2023	jmsb	Insurance Commission Non Interest Income InsuranceCommissionNonInterestIncome	386000
CY2022	jmsb	Insurance Commission Non Interest Income InsuranceCommissionNonInterestIncome	382000
CY2023	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	131000
CY2023	jmsb	Non Qualified Deferred Compensation Plan Asset Gains Losses Net NonQualifiedDeferredCompensationPlanAssetGainsLossesNet	317000
CY2022	jmsb	Non Qualified Deferred Compensation Plan Asset Gains Losses Net NonQualifiedDeferredCompensationPlanAssetGainsLossesNet	-354000
CY2023	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	150000
CY2022	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	139000
CY2023	us-gaap	Noninterest Income NoninterestIncome	-14940000
CY2022	us-gaap	Noninterest Income NoninterestIncome	1691000
CY2023	us-gaap	Labor And Related Expense LaborAndRelatedExpense	19436000
CY2022	us-gaap	Labor And Related Expense LaborAndRelatedExpense	20190000
CY2023	us-gaap	Occupancy Net OccupancyNet	1811000
CY2022	us-gaap	Occupancy Net OccupancyNet	1893000
CY2023	us-gaap	Equipment Expense EquipmentExpense	1178000
CY2022	us-gaap	Equipment Expense EquipmentExpense	1325000
CY2023	us-gaap	Other Noninterest Expense OtherNoninterestExpense	8390000
CY2022	us-gaap	Other Noninterest Expense OtherNoninterestExpense	8466000
CY2023	us-gaap	Noninterest Expense NoninterestExpense	30815000
CY2022	us-gaap	Noninterest Expense NoninterestExpense	31874000
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	7981000
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	40063000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2823000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8260000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	5158000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	31803000
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.37
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.27
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.36
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.25
CY2023	us-gaap	Net Income Loss NetIncomeLoss	5158000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	31803000
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax	-761000
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Before Reclassification Adjustments Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesBeforeReclassificationAdjustmentsTax	-7484000
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	2862000
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	-28153000
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-3636000
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-13680000
CY2023	us-gaap	Oci Debt Securities Available For Sale Transfer To Held To Maturity Adjustment From Aoci For Amortization Of Gain Loss Tax OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossTax	-26000
CY2022	us-gaap	Oci Debt Securities Available For Sale Transfer To Held To Maturity Adjustment From Aoci For Amortization Of Gain Loss Tax OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossTax	-38000
CY2023	us-gaap	Oci Debt Securities Available For Sale Transfer To Held To Maturity Adjustment From Aoci For Amortization Of Gain Loss After Tax OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossAfterTax	96000
CY2022	us-gaap	Oci Debt Securities Available For Sale Transfer To Held To Maturity Adjustment From Aoci For Amortization Of Gain Loss After Tax OciDebtSecuritiesAvailableForSaleTransferToHeldToMaturityAdjustmentFromAociForAmortizationOfGainLossAfterTax	144000
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	16446000
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-28297000
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	21604000
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3506000
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	208470000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	31803000
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-28297000
CY2022	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.0020
CY2022	us-gaap	Dividends Common Stock DividendsCommonStock	2799000
CY2022	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	8930
CY2022	jmsb	Shares Issued During Shares Surrendered Value SharesIssuedDuringSharesSurrenderedValue	3058000
CY2022	us-gaap	Stock Issued During Period Shares Restricted Stock Award Forfeited StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited	251
CY2022	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-8000
CY2022	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	573000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	212800000
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	212800000
CY2023	us-gaap	Net Income Loss NetIncomeLoss	5158000
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	16446000
CY2023	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.0022
CY2023	us-gaap	Dividends Common Stock DividendsCommonStock	3108000
CY2023	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	320000
CY2023	us-gaap	Stock Issued During Period Shares Restricted Stock Award Forfeited StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited	351
CY2023	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-6000
CY2023	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	596000
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	229914000
CY2023	us-gaap	Profit Loss ProfitLoss	5158000
CY2022	us-gaap	Profit Loss ProfitLoss	31803000
CY2023	us-gaap	Depreciation Depreciation	484000
CY2022	us-gaap	Depreciation Depreciation	557000
CY2023	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	1231000
CY2022	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	1360000
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	-3252000
CY2022	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	175000
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	596000
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	573000
CY2023	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	270000
CY2022	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	25000
CY2023	jmsb	Fair Value Adjustment On Equity Securities FairValueAdjustmentOnEquitySecurities	-317000
CY2022	jmsb	Fair Value Adjustment On Equity Securities FairValueAdjustmentOnEquitySecurities	354000
CY2023	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	84000
CY2022	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	317000
CY2023	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	16000
CY2023	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-17316000
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	921000
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	594000
CY2023	jmsb	Increase In Cash Surrender Value Of Life Insurance IncreaseInCashSurrenderValueOfLifeInsurance	224000
CY2022	jmsb	Increase In Cash Surrender Value Of Life Insurance IncreaseInCashSurrenderValueOfLifeInsurance	544000
CY2023	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	131000
CY2023	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	579000
CY2022	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	588000
CY2023	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1659000
CY2022	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1376000
CY2023	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	3524000
CY2022	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	192000
CY2023	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-4862000
CY2022	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-237000
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	18004000
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	33155000
CY2023	us-gaap	Payments To Acquire Loans And Leases Held For Investment PaymentsToAcquireLoansAndLeasesHeldForInvestment	71860000
CY2022	us-gaap	Payments To Acquire Loans And Leases Held For Investment PaymentsToAcquireLoansAndLeasesHeldForInvestment	123038000
CY2023	jmsb	Proceeds From Sale Of Government Guaranteed Loans Originally Classified As Held For Investment ProceedsFromSaleOfGovernmentGuaranteedLoansOriginallyClassifiedAsHeldForInvestment	1515000
CY2022	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	206890000
CY2022	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	1003000
CY2023	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	156011000
CY2023	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	35538000
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	53077000
CY2023	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	3715000
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	6841000
CY2023	jmsb	Net Purchase Redemption Of Restricted Securities NetPurchaseRedemptionOfRestrictedSecurities	587000
CY2022	jmsb	Net Purchase Redemption Of Restricted Securities NetPurchaseRedemptionOfRestrictedSecurities	-526000
CY2023	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	360000
CY2022	us-gaap	Payments To Acquire Equity Securities Fv Ni PaymentsToAcquireEquitySecuritiesFvNi	600000
CY2023	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	21394000
CY2022	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	371000
CY2023	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	82000
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	612000
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	156000
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	144836000
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-270872000
CY2023	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-161140000
CY2022	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	186187000
CY2022	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	18000000
CY2023	jmsb	Proceeds From Federal Reserve Bank Borrowings ProceedsFromFederalReserveBankBorrowings	54000000
CY2022	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	24579000
CY2022	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	25000000
CY2023	us-gaap	Payments Of Dividends PaymentsOfDividends	3108000
CY2022	us-gaap	Payments Of Dividends PaymentsOfDividends	2799000
CY2023	jmsb	Proceeds From Repayment Of Federal Funds Purchased ProceedsFromRepaymentOfFederalFundsPurchased	-15500000
CY2022	jmsb	Proceeds From Repayment Of Federal Funds Purchased ProceedsFromRepaymentOfFederalFundsPurchased	25500000
CY2023	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	320000
CY2022	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	3058000
CY2023	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	6000
CY2022	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	8000
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-125434000
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	193517000
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	37406000
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-44200000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	61599000
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	105799000
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	99005000
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	61599000
CY2023	us-gaap	Interest Paid Net InterestPaidNet	46678000
CY2022	us-gaap	Interest Paid Net InterestPaidNet	13136000
CY2023	us-gaap	Income Taxes Paid IncomeTaxesPaid	4110000
CY2022	us-gaap	Income Taxes Paid IncomeTaxesPaid	6583000
CY2023	jmsb	Unrealized Gain Loss On Securities Available For Sale UnrealizedGainLossOnSecuritiesAvailableForSale	20939000
CY2022	jmsb	Unrealized Gain Loss On Securities Available For Sale UnrealizedGainLossOnSecuritiesAvailableForSale	-35637000
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1009000
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1058000
CY2017Q1	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	1
CY2023Q4	us-gaap	Statutory Accounting Practices Statutory Amount Available For Dividend Payments Without Regulatory Approval StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval	58100000
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;font-style:italic;font-weight:bold;margin:0pt 0pt 10pt 0pt;">Use of Estimates</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt 0pt 10pt 0pt;">In preparing financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”), management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan credit losses.</p>
CY2023	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;font-style:italic;font-weight:bold;margin:0pt 0pt 10pt 0pt;">Reclassifications</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt 0pt 10pt 0pt;">Certain items in the prior year financial statements were reclassified to conform to the current presentation. Reclassifications had no effect on prior year net income or shareholders’ equity.</p>
CY2023	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<p style="font-family:'Times New Roman','Times','serif';font-size:10pt;font-style:italic;font-weight:bold;margin:0pt 0pt 10pt 0pt;">Concentration of Credit Risk</p><p style="font-family:'Times New Roman','Times','serif';font-size:10pt;text-align:justify;margin:0pt 0pt 10pt 0pt;">Most of the Company’s activities are with customers located in the Washington, D.C. metropolitan area. Real estate loans, including commercial, construction and land development, and residential loans, represented 98% of the total loan portfolio at December 31, 2023 and 97% of the total loan portfolio at December 31, 2022. The Company does not have any significant concentrations to any one industry or customer.</p>
CY2023Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	518000
CY2023	jmsb	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List Not Disclosed Flag DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleListNotDisclosedFlag	true
CY2022Q4	us-gaap	Servicing Asset ServicingAsset	0
CY2023Q4	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	5300000
CY2023Q4	us-gaap	Debt Securities Held To Maturity Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss	255000
CY2023Q4	us-gaap	Other Real Estate OtherRealEstate	0
CY2022Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	0
CY2023Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	0
CY2023Q4	us-gaap	Servicing Asset ServicingAsset	22000
CY2022Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0
CY2023	us-gaap	Advertising Expense AdvertisingExpense	288000
CY2022	us-gaap	Advertising Expense AdvertisingExpense	193000
CY2022Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest Current DebtSecuritiesAvailableForSaleExcludingAccruedInterestCurrent	0
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest Current DebtSecuritiesAvailableForSaleExcludingAccruedInterestCurrent	0
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	185690000
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	15697000
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	169993000
CY2022Q4	us-gaap	Debt Securities Available For Sale Amortized Cost After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostAfterAllowanceForCreditLoss	394213000
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	36637000
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	357576000
CY2023	us-gaap	Availableforsale Securities Sold At Par AvailableforsaleSecuritiesSoldAtPar	173200000
CY2023	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-17300000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	169993000
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	15697000
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	169993000
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	15697000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	217505000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	13763000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	140071000
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	22874000
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	357576000
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	36637000
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	158
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	98
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	22248000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	21933000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	46393000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	44271000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	53890000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	50962000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	63159000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	52827000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	185690000
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	169993000
CY2023	jmsb	Investment Weighted Average Remaining Life InvestmentWeightedAverageRemainingLife	P3Y
CY2022	jmsb	Investment Weighted Average Remaining Life InvestmentWeightedAverageRemainingLife	P3Y9M18D
CY2023Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	95505000
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	15973000
CY2023Q4	jmsb	Held To Maturity Securities Fair Value Excluding Accrued Interest HeldToMaturitySecuritiesFairValueExcludingAccruedInterest	79532000
CY2022Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	99415000
CY2022Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	18254000
CY2022Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	81161000
CY2022Q4	jmsb	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLossPositionLessThanTwelveMonthsFairValue	825000
CY2022Q4	jmsb	Held To Maturity Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturityContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	159000
CY2022Q4	jmsb	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Month Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthOrLongerFairValue	80336000
CY2022Q4	jmsb	Held To Maturity Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturityContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	18095000
CY2022Q4	jmsb	Held To Maturity Continuous Unrealized Loss Position Fair Value HeldToMaturityContinuousUnrealizedLossPositionFairValue	81161000
CY2022Q4	jmsb	Held To Maturity Continuous Unrealized Loss Position Accumulated Loss HeldToMaturityContinuousUnrealizedLossPositionAccumulatedLoss	18254000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	22153000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	19600000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	23492000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	19766000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	49860000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	40166000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	95505000
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	79532000
CY2023	jmsb	Held To Maturity Weighted Average Remaining Life HeldToMaturityWeightedAverageRemainingLife	P6Y8M12D
CY2022	jmsb	Held To Maturity Weighted Average Remaining Life HeldToMaturityWeightedAverageRemainingLife	P7Y3M18D
CY2023Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	3310000
CY2022Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	3292000
CY2023Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	1642000
CY2022Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	1073000
CY2023Q4	jmsb	Community Bankers Bank Stock CommunityBankersBankStock	60000
CY2022Q4	jmsb	Community Bankers Bank Stock CommunityBankersBankStock	60000
CY2023Q4	us-gaap	Restricted Investments RestrictedInvestments	5012000
CY2022Q4	us-gaap	Restricted Investments RestrictedInvestments	4425000
CY2023Q4	us-gaap	Equity Securities Fv Ni Current And Noncurrent EquitySecuritiesFvNiCurrentAndNoncurrent	2800000
CY2022Q4	us-gaap	Equity Securities Fv Ni Current And Noncurrent EquitySecuritiesFvNiCurrentAndNoncurrent	2100000
CY2023	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	317000
CY2022	us-gaap	Equity Securities Fv Ni Realized Gain Loss EquitySecuritiesFvNiRealizedGainLoss	-354000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss Fee And Loan In Process FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess	1854984000
CY2022Q4	us-gaap	Loans And Leases Receivable Before Fees Gross LoansAndLeasesReceivableBeforeFeesGross	1785448000
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest Noncurrent FinancingReceivableAllowanceForCreditLossExcludingAccruedInterestNoncurrent	19543000
CY2022Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	20208000
CY2023Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	4983000
CY2022Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	4060000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	1840424000
CY2022Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	1769300000
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	20208000
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	2000
CY2023	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-2832000
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	19543000
CY2021Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	20032000
CY2022	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	-1000
CY2022	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	2000
CY2022	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	175000
CY2022Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	20208000
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	0
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	20208000
CY2022Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	20208000
CY2022Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	418000
CY2022Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1785030000
CY2022Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1785448000
CY2022Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	418000
CY2022Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	418000
CY2022Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	418000
CY2022	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	427000
CY2022	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	15000
CY2023Q4	jmsb	Loans And Leases Receivable Current Carrying Amount LoansAndLeasesReceivableCurrentCarryingAmount	1854984000
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss Fee And Loan In Process FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess	1854984000
CY2022Q4	jmsb	Loans And Leases Receivable Current Carrying Amount LoansAndLeasesReceivableCurrentCarryingAmount	1785448000
CY2022Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1785448000
CY2022Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1785448000
CY2022Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	418000
CY2022	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0
CY2023	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0
CY2022	jmsb	Financing Receivable Troubled Debt Restructuring Number Of Contracts That Require Special Reserve FinancingReceivableTroubledDebtRestructuringNumberOfContractsThatRequireSpecialReserve	0
CY2022Q4	jmsb	Financing Receivable Troubled Debt Restructuring Additional Commitment To Disburse Funds FinancingReceivableTroubledDebtRestructuringAdditionalCommitmentToDisburseFunds	0
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	9631000
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	9141000
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	8350000
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	7922000
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1281000
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1219000
CY2023	us-gaap	Depreciation Depreciation	484000
CY2022	us-gaap	Depreciation Depreciation	557000
CY2023Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	411374000
CY2022Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	476697000
CY2023Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	607971000
CY2022Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	691945000
CY2023Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	52061000
CY2022Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	95241000
CY2023Q4	us-gaap	Time Deposits TimeDeposits	835194000
CY2022Q4	us-gaap	Time Deposits TimeDeposits	803857000
CY2023Q4	us-gaap	Deposits Deposits	1906600000
CY2022Q4	us-gaap	Deposits Deposits	2067740000
CY2022Q4	us-gaap	Deposit Liabilities Reclassified As Loans Receivable1 DepositLiabilitiesReclassifiedAsLoansReceivable1	1000
CY2023Q4	us-gaap	Deposit Liabilities Reclassified As Loans Receivable1 DepositLiabilitiesReclassifiedAsLoansReceivable1	1000
CY2023	jmsb	Certificate Of Deposits CertificateOfDeposits	359300000
CY2022	jmsb	Certificate Of Deposits CertificateOfDeposits	318700000
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	54000000
CY2023Q4	us-gaap	Long Term Debt LongTermDebt	24708000
CY2022Q4	us-gaap	Long Term Debt LongTermDebt	24624000
CY2023Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	320600000
CY2022Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	352000000.0
CY2023Q4	jmsb	Reciprocal Certificates Of Deposits ReciprocalCertificatesOfDeposits	45600000
CY2022Q4	jmsb	Reciprocal Certificates Of Deposits ReciprocalCertificatesOfDeposits	25700000
CY2023Q4	jmsb	Reciprocal Demand And Money Market Deposit ReciprocalDemandAndMoneyMarketDeposit	234900000
CY2022Q4	jmsb	Reciprocal Demand And Money Market Deposit ReciprocalDemandAndMoneyMarketDeposit	197300000
CY2023Q4	jmsb	Number Of Depositors Representing Five Percent Or More Of Total Deposits NumberOfDepositorsRepresentingFivePercentOrMoreOfTotalDeposits	0
CY2023	jmsb	Percentage Of Deposits Exceeds Five Or More PercentageOfDepositsExceedsFiveOrMore	0.05
CY2023Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	436900000
CY2023Q4	jmsb	Time Deposits And Fhlb Advances Next Twelve Months TimeDepositsAndFhlbAdvancesNextTwelveMonths	574056000
CY2023Q4	jmsb	Time Deposits And Fhlb Advances Year Two TimeDepositsAndFhlbAdvancesYearTwo	181797000
CY2023Q4	jmsb	Time Deposits And Fhlb Advances Year Three TimeDepositsAndFhlbAdvancesYearThree	68629000
CY2023Q4	jmsb	Time Deposits And Fhlb Advances Year Four TimeDepositsAndFhlbAdvancesYearFour	10165000
CY2023Q4	jmsb	Time Deposits And Fhlb Advances Year Five TimeDepositsAndFhlbAdvancesYearFive	547000
CY2023Q4	jmsb	Time Deposits And Fhlb Advances TimeDepositsAndFhlbAdvances	835194000
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	4446000
CY2022Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	4858000
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	4176000
CY2022Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	4611000
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P3Y10M20D
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y29D
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0300
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0262
CY2023	us-gaap	Operating Lease Cost OperatingLeaseCost	1392000
CY2022	us-gaap	Operating Lease Cost OperatingLeaseCost	1469000
CY2023	us-gaap	Lease Cost LeaseCost	1392000
CY2022	us-gaap	Lease Cost LeaseCost	1469000
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	1400000
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	1500000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	1322000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1319000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1121000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	429000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	291000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	276000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	4758000
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	312000
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	4446000
CY2023	us-gaap	Operating Lease Expense OperatingLeaseExpense	1500000
CY2022	us-gaap	Operating Lease Expense OperatingLeaseExpense	1600000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	4477000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	4581000
CY2023Q4	jmsb	Deferred Tax Asset Operating Lease Liability DeferredTaxAssetOperatingLeaseLiability	987000
CY2022Q4	jmsb	Deferred Tax Asset Operating Lease Liability DeferredTaxAssetOperatingLeaseLiability	1101000
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	45000
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	91000
CY2023Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	3257000
CY2022Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	7628000
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	453000
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	416000
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	9219000
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	13817000
CY2023Q4	jmsb	Deferred Tax Liabilities Operating Lease Right Of Use Asset DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset	927000
CY2022Q4	jmsb	Deferred Tax Liabilities Operating Lease Right Of Use Asset DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset	1045000
CY2023Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	53000
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	49000
CY2023Q4	jmsb	Deferred Tax Liabilities Net Deferred Loan Costs DeferredTaxLiabilitiesNetDeferredLoanCosts	1106000
CY2022Q4	jmsb	Deferred Tax Liabilities Net Deferred Loan Costs DeferredTaxLiabilitiesNetDeferredLoanCosts	920000
CY2023Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	76000
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	62000
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	2162000
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	2076000
CY2023Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	7057000
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	11741000
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1902000
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	7666000
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	921000
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	594000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2823000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8260000
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	1676000
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	8413000
CY2023	jmsb	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Policy Surrender Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsurancePolicySurrenderAmount	-1101000
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	180000
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	516000
CY2023	jmsb	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsuranceAmount	47000
CY2022	jmsb	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsuranceAmount	114000
CY2023	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	69000
CY2022	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	158000
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	-19000
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	-427000
CY2023	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1000
CY2022	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	30000
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2823000
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8260000
CY2022Q4	jmsb	Collateral Dependent Loans CollateralDependentLoans	0
CY2023Q4	jmsb	Collateral Dependent Loans CollateralDependentLoans	0
CY2022Q4	us-gaap	Other Real Estate OtherRealEstate	0
CY2023Q4	us-gaap	Other Real Estate OtherRealEstate	0
CY2023	us-gaap	Net Income Loss NetIncomeLoss	5158000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	31803000
CY2023	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	17000
CY2022	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	136000
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	5141000
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	31667000
CY2023	jmsb	Weighted Average Number Basic Shares Outstanding Including Unvested Restricted Stock Awards WeightedAverageNumberBasicSharesOutstandingIncludingUnvestedRestrictedStockAwards	14124696
CY2022	jmsb	Weighted Average Number Basic Shares Outstanding Including Unvested Restricted Stock Awards WeightedAverageNumberBasicSharesOutstandingIncludingUnvestedRestrictedStockAwards	13991875
CY2023	jmsb	Weighted Average Number Basic Shares Outstanding Adjustment On Unvested Restricted Stock Awards WeightedAverageNumberBasicSharesOutstandingAdjustmentOnUnvestedRestrictedStockAwards	47771
CY2022	jmsb	Weighted Average Number Basic Shares Outstanding Adjustment On Unvested Restricted Stock Awards WeightedAverageNumberBasicSharesOutstandingAdjustmentOnUnvestedRestrictedStockAwards	60034
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14076925
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	13931841
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.37
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.27
CY2023	us-gaap	Net Income Loss NetIncomeLoss	5158000
CY2022	us-gaap	Net Income Loss NetIncomeLoss	31803000
CY2023	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	17000
CY2022	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	135000
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	5141000
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	31668000
CY2023	jmsb	Weighted Average Number Diluted Shares Outstanding Including Unvested Restricted Stock Awards WeightedAverageNumberDilutedSharesOutstandingIncludingUnvestedRestrictedStockAwards	14124696
CY2022	jmsb	Weighted Average Number Diluted Shares Outstanding Including Unvested Restricted Stock Awards WeightedAverageNumberDilutedSharesOutstandingIncludingUnvestedRestrictedStockAwards	13991875
CY2023	jmsb	Weighted Average Number Diluted Shares Outstanding Adjustment On Unvested Restricted Stock Awards WeightedAverageNumberDilutedSharesOutstandingAdjustmentOnUnvestedRestrictedStockAwards	47771
CY2022	jmsb	Weighted Average Number Diluted Shares Outstanding Adjustment On Unvested Restricted Stock Awards WeightedAverageNumberDilutedSharesOutstandingAdjustmentOnUnvestedRestrictedStockAwards	60034
CY2023	us-gaap	Incremental Common Shares Attributable To Accelerated Share Repurchase Agreements IncrementalCommonSharesAttributableToAcceleratedShareRepurchaseAgreements	70268
CY2022	us-gaap	Incremental Common Shares Attributable To Accelerated Share Repurchase Agreements IncrementalCommonSharesAttributableToAcceleratedShareRepurchaseAgreements	152586
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14147193
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14084427
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.36
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.25
CY2023	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	502000
CY2022	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	474000
CY2023Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	2300000
CY2022Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	1900000
CY2023	us-gaap	Deferred Compensation Arrangement With Individual Contributions By Employer DeferredCompensationArrangementWithIndividualContributionsByEmployer	297000
CY2022	us-gaap	Deferred Compensation Arrangement With Individual Contributions By Employer DeferredCompensationArrangementWithIndividualContributionsByEmployer	192000
CY2023	jmsb	Deferred Compensation Plan Discretionary Contributions Conditional Vesting Period DeferredCompensationPlanDiscretionaryContributionsConditionalVestingPeriod	P3Y
CY2023Q4	us-gaap	Banking Regulation Capital Conservation Buffer Common Equity Tier One Risk Based Capital Actual BankingRegulationCapitalConservationBufferCommonEquityTierOneRiskBasedCapitalActual	0.025
CY2023Q4	us-gaap	Capital Capital	282082000
CY2023Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.157
CY2023Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	188448000
CY2023Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.105
CY2023Q4	us-gaap	Capital Required To Be Well Capitalized CapitalRequiredToBeWellCapitalized	179475000
CY2023Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.100
CY2023Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	263637000
CY2023Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.147
CY2023Q4	jmsb	Tier One Risk Based Capital Required For Capital Adequacy With Buffer TierOneRiskBasedCapitalRequiredForCapitalAdequacyWithBuffer	152553000
CY2023Q4	jmsb	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets With Buffer TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsWithBuffer	0.085
CY2023Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized TierOneRiskBasedCapitalRequiredToBeWellCapitalized	143580000
CY2023Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.080
CY2023Q4	us-gaap	Common Equity Tier One Capital CommonEquityTierOneCapital	263637000
CY2023Q4	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.147
CY2023Q4	us-gaap	Common Equity Tier One Capital Required For Capital Adequacy CommonEquityTierOneCapitalRequiredForCapitalAdequacy	125632000
CY2023Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Capital Adequacy Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum	0.070
CY2023Q4	us-gaap	Common Equity Tier One Capital Required To Be Well Capitalized CommonEquityTierOneCapitalRequiredToBeWellCapitalized	116658000
CY2023Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Well Capitalized Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum	0.065
CY2023Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	263637000
CY2023Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.116
CY2023Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	91163000
CY2023Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.040
CY2023Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized TierOneLeverageCapitalRequiredToBeWellCapitalized	113954000
CY2023Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.050
CY2022Q4	us-gaap	Capital Capital	283471000
CY2022Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.156
CY2022Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	190798000
CY2022Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.105
CY2022Q4	us-gaap	Capital Required To Be Well Capitalized CapitalRequiredToBeWellCapitalized	181712000
CY2022Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.100
CY2022Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	262960000
CY2022Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.144
CY2022Q4	jmsb	Tier One Risk Based Capital Required For Capital Adequacy With Buffer TierOneRiskBasedCapitalRequiredForCapitalAdequacyWithBuffer	155219000
CY2022Q4	jmsb	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets With Buffer TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsWithBuffer	0.085
CY2022Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized TierOneRiskBasedCapitalRequiredToBeWellCapitalized	146089000
CY2022Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.080
CY2022Q4	us-gaap	Common Equity Tier One Capital CommonEquityTierOneCapital	262960000
CY2022Q4	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.144
CY2022Q4	us-gaap	Common Equity Tier One Capital Required For Capital Adequacy CommonEquityTierOneCapitalRequiredForCapitalAdequacy	127828000
CY2022Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Capital Adequacy Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum	0.070
CY2022Q4	us-gaap	Common Equity Tier One Capital Required To Be Well Capitalized CommonEquityTierOneCapitalRequiredToBeWellCapitalized	118697000
CY2022Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Well Capitalized Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum	0.065
CY2022Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	262960000
CY2022Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.113
CY2022Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	93083000
CY2022Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.040
CY2022Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized TierOneLeverageCapitalRequiredToBeWellCapitalized	116354000
CY2022Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.050
CY2023	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	224000
CY2022	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	544000
CY2023	us-gaap	Gain Loss On Investments GainLossOnInvestments	-17316000
CY2023	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	131000
CY2023	jmsb	Non Qualified Deferred Compensation Plan Asset Gains Losses Net NonQualifiedDeferredCompensationPlanAssetGainsLossesNet	317000
CY2022	jmsb	Non Qualified Deferred Compensation Plan Asset Gains Losses Net NonQualifiedDeferredCompensationPlanAssetGainsLossesNet	-354000
CY2023	jmsb	Other Noninterest Operating Income Expense OtherNoninterestOperatingIncomeExpense	150000
CY2022	jmsb	Other Noninterest Operating Income Expense OtherNoninterestOperatingIncomeExpense	139000
CY2023	us-gaap	Noninterest Income NoninterestIncome	-14940000
CY2022	us-gaap	Noninterest Income NoninterestIncome	1691000
CY2023	jmsb	Noninterest Income Other Income NoninterestIncomeOtherIncome	59000
CY2023	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	91000
CY2022	jmsb	Noninterest Income Other Income NoninterestIncomeOtherIncome	12000
CY2022	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	127000
CY2023	us-gaap	Advertising Expense AdvertisingExpense	288000
CY2022	us-gaap	Advertising Expense AdvertisingExpense	193000
CY2023	jmsb	Data Processing Expense DataProcessingExpense	1936000
CY2022	jmsb	Data Processing Expense DataProcessingExpense	1940000
CY2023	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1041000
CY2022	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	605000
CY2023	jmsb	Professional Fees Net ProfessionalFeesNet	329000
CY2022	jmsb	Professional Fees Net ProfessionalFeesNet	1231000
CY2023	jmsb	State Franchise Tax StateFranchiseTax	2389000
CY2022	jmsb	State Franchise Tax StateFranchiseTax	2092000
CY2023	us-gaap	Noninterest Expense Directors Fees NoninterestExpenseDirectorsFees	876000
CY2022	us-gaap	Noninterest Expense Directors Fees NoninterestExpenseDirectorsFees	810000
CY2023	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	1531000
CY2022	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	1595000
CY2023	us-gaap	Other Noninterest Expense OtherNoninterestExpense	8390000
CY2022	us-gaap	Other Noninterest Expense OtherNoninterestExpense	8466000
CY2023Q4	jmsb	Low Income Housing Tax Credit Investments Housing Equity Funds Number LowIncomeHousingTaxCreditInvestmentsHousingEquityFundsNumber	7
CY2023Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	4700000
CY2022Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	5200000
CY2023	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	113000
CY2022	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	94000
CY2023Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	2500000
CY2022Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	3000000.0
CY2023	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-17300000
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	3600000
CY2023Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	12900000
CY2022Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	15400000
CY2023	us-gaap	Loans And Leases Receivable Related Parties Additions LoansAndLeasesReceivableRelatedPartiesAdditions	447000
CY2023	us-gaap	Loans And Leases Receivable Related Parties Proceeds LoansAndLeasesReceivableRelatedPartiesProceeds	2900000
CY2023Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	24100000
CY2022Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	28700000
CY2023Q4	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2023Q4	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2023Q4	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2023	dei	Auditor Firm AuditorFirmId	613

Files In Submission

Name	View Source	Status
0001558370-24-003634-index-headers.html	Edgar Link	pending
0001558370-24-003634-index.html	Edgar Link	pending
0001558370-24-003634.txt	Edgar Link	pending
0001558370-24-003634-xbrl.zip	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
jmsb-20231231.xsd	Edgar Link	pending
jmsb-20231231x10k.htm	Edgar Link	pending
jmsb-20231231x10k009.jpg	Edgar Link	pending
jmsb-20231231xex21.htm	Edgar Link	pending
jmsb-20231231xex23d1.htm	Edgar Link	pending
jmsb-20231231xex23d1001.jpg	Edgar Link	pending
jmsb-20231231xex31d1.htm	Edgar Link	pending
jmsb-20231231xex31d2.htm	Edgar Link	pending
jmsb-20231231xex32d1.htm	Edgar Link	pending
jmsb-20231231xex4d3.htm	Edgar Link	pending
jmsb-20231231xex97.htm	Edgar Link	pending
jmsb-20231231xex97001.jpg	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
jmsb-20231231_cal.xml	Edgar Link	unprocessable
jmsb-20231231_def.xml	Edgar Link	unprocessable
jmsb-20231231_lab.xml	Edgar Link	unprocessable
jmsb-20231231_pre.xml	Edgar Link	unprocessable
jmsb-20231231x10k_htm.xml	Edgar Link	completed
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R102.htm	Edgar Link	pending
R103.htm	Edgar Link	pending
R104.htm	Edgar Link	pending
R105.htm	Edgar Link	pending
R106.htm	Edgar Link	pending
R107.htm	Edgar Link	pending
R108.htm	Edgar Link	pending
R109.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R110.htm	Edgar Link	pending
R111.htm	Edgar Link	pending
R112.htm	Edgar Link	pending
R113.htm	Edgar Link	pending
R114.htm	Edgar Link	pending
R115.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
R99.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$JMSB
John Marshall Bancorp, Inc. Stock $jmsb

2024 Q1 Form 10-K Financial Statement

#000155837024003634 Filed on March 20, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$JMSB John Marshall Bancorp, Inc. Stock $jmsb

2024 Q1 Form 10-K Financial Statement

#000155837024003634 Filed on March 20, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$JMSB
John Marshall Bancorp, Inc. Stock $jmsb