$BFST
Business First Bancshares Inc Stock $bfst

$bfst Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000143774924006270 Filed on March 01, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$2.439M		$9.704M
YoY Change	6.93%		17.31%
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	$1.153M	$1.124M	$4.670M
YoY Change	-2.86%	-4.42%	-3.07%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$44.48M		$138.2M
YoY Change	66.32%		278.24%
% of Operating Profit
Other Income/Expense, Net			$13.97M
YoY Change			12.54%
Pretax Income	$17.21M	$20.34M	$90.59M
YoY Change	-10.54%	-11.34%	32.06%
Income Tax	$3.639M	$4.516M	$19.54M
% Of Pretax Income	21.15%	22.2%	21.57%
Net Earnings	$13.57M	$14.47M	$65.64M
YoY Change	-9.68%	-12.9%	20.99%
Net Earnings / Revenue	556.38%		676.44%
Basic Earnings Per Share	$0.49		$2.62
Diluted Earnings Per Share	$0.48	$0.57	$2.60
COMMON SHARES
Basic Shares Outstanding	25.36M	25.34M	25.08M
Diluted Shares Outstanding	25.43M shares		25.30M

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$185.9M	$226.1M
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	$68.72M	$69.48M	$69.48M
YoY Change	7.26%	9.98%	9.98%
Goodwill	$91.53M	$88.40M
YoY Change	3.37%	-0.11%
Intangibles
YoY Change
Long-Term Investments		$16.02M
YoY Change		12.51%
Other Assets	$26.80M	$27.32M	$27.32M
YoY Change	-6.56%	-12.41%	-12.41%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$6.696B	$6.585B	$6.585B
YoY Change	6.45%	9.92%	9.92%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$3.930M	$14.84M	$14.84M
YoY Change	11.87%	609.42%	609.42%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$17.21M	$18.89M	$18.89M
YoY Change	-45.03%	-44.9%	-44.9%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$21.14M	$33.73M	$33.73M
YoY Change	-39.28%	-7.26%	-7.26%
LONG-TERM LIABILITIES
Long-Term Debt	$104.9M	$405.0M	$405.0M
YoY Change	-75.34%	249.89%	249.89%
Other Long-Term Liabilities	$39.50M	$41.59M	$41.59M
YoY Change	29.21%	51.67%	51.67%
Total Long-Term Liabilities	$144.4M	$446.6M	$446.6M
YoY Change	-68.34%	211.93%	211.93%
TOTAL LIABILITIES
Total Short-Term Liabilities	$21.14M	$33.73M	$33.73M
Total Long-Term Liabilities	$144.4M	$446.6M	$446.6M
Total Liabilities	$6.047B	$5.940B	$5.940B
YoY Change	6.22%	9.8%	9.8%
SHAREHOLDERS EQUITY
Retained Earnings	$224.7M	$216.1M
YoY Change	29.34%	31.81%
Common Stock	$424.0M	$422.8M
YoY Change	0.95%	0.95%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$649.0M	$644.3M	$644.3M
YoY Change
Total Liabilities & Shareholders Equity	$6.696B	$6.585B	$6.585B
YoY Change	6.45%	9.92%	9.92%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$13.57M	$14.47M	$65.64M
YoY Change	-9.68%	-12.9%	20.99%
Depreciation, Depletion And Amortization	$1.153M	$1.124M	$4.670M
YoY Change	-2.86%	-4.42%	-3.07%
Cash From Operating Activities	$7.603M	$21.28M	$92.43M
YoY Change	-66.85%	86.99%	32.84%
INVESTING ACTIVITIES
Capital Expenditures	$389.0K	$5.930M	$11.65M
YoY Change	-81.25%	908.5%	49.7%
Acquisitions
YoY Change
Other Investing Activities	-$161.8M	-$26.50M	-$509.5M
YoY Change	-43.7%	-84.49%	-26.45%
Cash From Investing Activities	-$162.2M	-$32.44M	-$521.1M
YoY Change	-43.97%	-81.09%	-25.61%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$114.3M	45.81M	$502.1M
YoY Change	-58.19%	-71.41%	-29.81%
NET CHANGE
Cash From Operating Activities	$7.603M	21.28M	$92.43M
Cash From Investing Activities	-$162.2M	-32.44M	-$521.1M
Cash From Financing Activities	$114.3M	45.81M	$502.1M
Net Change In Cash	-$40.20M	34.65M	$73.37M
YoY Change	-672.14%	50115.94%	-13.03%
FREE CASH FLOW
Cash From Operating Activities	$7.603M	$21.28M	$92.43M
Capital Expenditures	$389.0K	$5.930M	$11.65M
Free Cash Flow	$7.214M	$15.35M	$80.78M
YoY Change	-65.42%	42.23%	30.72%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2023	dei	Entity Central Index Key EntityCentralIndexKey	0001624322
CY2023	dei	Entity Registrant Name EntityRegistrantName	Business First Bancshares, Inc.
CY2023	dei	Amendment Flag AmendmentFlag	false
CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
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CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	38178000	usd
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CY2022Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
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CY2022Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
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CY2022Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	72010
CY2023Q4	us-gaap	Preferred Stock Liquidation Preference Value PreferredStockLiquidationPreferenceValue	1000000	usd
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CY2022Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	25110313
CY2022Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	25110313
CY2021	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.46
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CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	001-38447
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	LA
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	20-5340628
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	500 Laurel Street, Suite 101
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Baton Rouge
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	LA
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	70801
CY2023	dei	City Area Code CityAreaCode	225
CY2023	dei	Local Phone Number LocalPhoneNumber	248-7600
CY2023	dei	Security12b Title Security12bTitle	Common Stock, par value $1.00 per share
CY2023	dei	Trading Symbol TradingSymbol	BFST
CY2023	dei	Security Exchange Name SecurityExchangeName	NASDAQ
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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	Accelerated Filer
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CY2023	us-gaap	Labor And Related Expense LaborAndRelatedExpense	90611000	usd
CY2022	us-gaap	Labor And Related Expense LaborAndRelatedExpense	85222000	usd
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	65825000	usd
CY2023	us-gaap	Occupancy Net OccupancyNet	20859000	usd
CY2022	us-gaap	Occupancy Net OccupancyNet	19367000	usd
CY2021	us-gaap	Occupancy Net OccupancyNet	15750000	usd
CY2023	us-gaap	Other Noninterest Expense OtherNoninterestExpense	45232000	usd
CY2022	us-gaap	Other Noninterest Expense OtherNoninterestExpense	44820000	usd
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	35486000	usd
CY2023	us-gaap	Noninterest Expense NoninterestExpense	156702000	usd
CY2022	us-gaap	Noninterest Expense NoninterestExpense	149409000	usd
CY2021	us-gaap	Noninterest Expense NoninterestExpense	117061000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	90586000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	68592000	usd
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	64558000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	19543000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14337000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12422000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	71043000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	54255000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	52136000	usd
CY2023	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	5401000	usd
CY2022	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	1350000	usd
CY2021	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	0	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	65642000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	52905000	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	52136000	usd
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.62
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.34
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.54
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.59
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.32
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.53
CY2023	us-gaap	Net Income Loss NetIncomeLoss	71043000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	54255000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	52136000	usd
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	13006000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-93418000	usd
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-14985000	usd
CY2023	bfst	Oci Equity Securities Availableforsale Unrealized Holding Gain Loss Before Adjustment And Tax OciEquitySecuritiesAvailableforsaleUnrealizedHoldingGainLossBeforeAdjustmentAndTax	-782000	usd
CY2022	bfst	Oci Equity Securities Availableforsale Unrealized Holding Gain Loss Before Adjustment And Tax OciEquitySecuritiesAvailableforsaleUnrealizedHoldingGainLossBeforeAdjustmentAndTax	874000	usd
CY2021	bfst	Oci Equity Securities Availableforsale Unrealized Holding Gain Loss Before Adjustment And Tax OciEquitySecuritiesAvailableforsaleUnrealizedHoldingGainLossBeforeAdjustmentAndTax	-336000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	2565000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	48000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-378000	usd
CY2023	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	2040000	usd
CY2022	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-19565000	usd
CY2021	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-3138000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7619000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-73027000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-11805000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	78662000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-18772000	usd
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	40331000	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	409963000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	52136000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-11805000	usd
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	9436000	usd
CY2021	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	3564000	usd
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	2861000	usd
CY2021	bfst	Stock Surrendered Of Options Exercised StockSurrenderedOfOptionsExercised	2992000	usd
CY2021	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	10923000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	433368000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	54255000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-73027000	usd
CY2022	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	1350000	usd
CY2022	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	10824000	usd
CY2022	bfst	Stock Issued During Period Value Preferred Stock StockIssuedDuringPeriodValuePreferredStock	71930000	usd
CY2022	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	103535000	usd
CY2022	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	3696000	usd
CY2022	bfst	Stock Surrendered Of Options Exercised StockSurrenderedOfOptionsExercised	1102000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	580481000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	71043000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	7619000	usd
CY2023	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	5401000	usd
CY2023	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	12655000	usd
CY2023	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	3999000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	644259000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	71043000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	54255000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	52136000	usd
CY2023	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	4483000	usd
CY2022	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	10886000	usd
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	8047000	usd
CY2023	us-gaap	Depreciation And Amortization DepreciationAndAmortization	4670000	usd
CY2022	us-gaap	Depreciation And Amortization DepreciationAndAmortization	4818000	usd
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	4163000	usd
CY2023	bfst	Business Acquisition Amortization Accretion Fair Market Value Adjustments BusinessAcquisitionAmortizationAccretionFairMarketValueAdjustments	-7615000	usd
CY2022	bfst	Business Acquisition Amortization Accretion Fair Market Value Adjustments BusinessAcquisitionAmortizationAccretionFairMarketValueAdjustments	-7949000	usd
CY2021	bfst	Business Acquisition Amortization Accretion Fair Market Value Adjustments BusinessAcquisitionAmortizationAccretionFairMarketValueAdjustments	-7122000	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	3999000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	3696000	usd
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	2861000	usd
CY2023	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-4197000	usd
CY2022	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-6005000	usd
CY2021	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-7021000	usd
CY2023	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-2565000	usd
CY2022	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-48000	usd
CY2021	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	378000	usd
CY2023	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	671000	usd
CY2022	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	398000	usd
CY2021	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	9179000	usd
CY2023	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	3045000	usd
CY2022	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1554000	usd
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	2399000	usd
CY2023	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	214000	usd
CY2022	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-92000	usd
CY2021	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-1404000	usd
CY2023	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	2247000	usd
CY2022	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	1931000	usd
CY2021	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	1396000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2052000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1368000	usd
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	586000	usd
CY2023	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	945000	usd
CY2022	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	-0	usd
CY2021	us-gaap	Gain Loss On Disposition Of Assets1 GainLossOnDispositionOfAssets1	492000	usd
CY2023	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	4250000	usd
CY2022	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	3466000	usd
CY2021	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-4298000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1683000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-6075000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	3500000	usd
CY2023	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	12749000	usd
CY2022	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	519000	usd
CY2021	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-1145000	usd
CY2023	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	11443000	usd
CY2022	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-151000	usd
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	1538000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	92427000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	69577000	usd
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	56443000	usd
CY2023	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	131038000	usd
CY2022	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	102809000	usd
CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	528059000	usd
CY2023	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	91981000	usd
CY2022	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	38951000	usd
CY2021	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	29945000	usd
CY2023	bfst	Proceeds From Repayments Of Investment Securities Available For Sale ProceedsFromRepaymentsOfInvestmentSecuritiesAvailableForSale	53916000	usd
CY2022	bfst	Proceeds From Repayments Of Investment Securities Available For Sale ProceedsFromRepaymentsOfInvestmentSecuritiesAvailableForSale	95019000	usd
CY2021	bfst	Proceeds From Repayments Of Investment Securities Available For Sale ProceedsFromRepaymentsOfInvestmentSecuritiesAvailableForSale	96408000	usd
CY2023	bfst	Cash Acquired From Paid For Acquisition CashAcquiredFromPaidForAcquisition	0	usd
CY2022	bfst	Cash Acquired From Paid For Acquisition CashAcquiredFromPaidForAcquisition	163460000	usd
CY2021	bfst	Cash Acquired From Paid For Acquisition CashAcquiredFromPaidForAcquisition	-7256000	usd
CY2023	bfst	Payments To Sell Branch Net PaymentsToSellBranchNet	14506000	usd
CY2022	bfst	Payments To Sell Branch Net PaymentsToSellBranchNet	-0	usd
CY2021	bfst	Payments To Sell Branch Net PaymentsToSellBranchNet	13727000	usd
CY2023	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	15573000	usd
CY2022	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	22670000	usd
CY2021	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	4438000	usd
CY2023	bfst	Redemption Of Other Equity Securities RedemptionOfOtherEquitySecurities	21361000	usd
CY2022	bfst	Redemption Of Other Equity Securities RedemptionOfOtherEquitySecurities	10327000	usd
CY2021	bfst	Redemption Of Other Equity Securities RedemptionOfOtherEquitySecurities	2575000	usd
CY2023	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	2273000	usd
CY2022	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	18000000	usd
CY2021	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	15928000	usd
CY2023	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	usd
CY2022	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	499000	usd
CY2021	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1974000	usd
CY2023	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	0	usd
CY2022	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	0	usd
CY2021	us-gaap	Proceeds From Sale Of Loans Receivable ProceedsFromSaleOfLoansReceivable	243607000	usd
CY2023	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	379073000	usd
CY2022	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	1070354000	usd
CY2021	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	431236000	usd
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	11648000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7781000	usd
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3971000	usd
CY2023	bfst	Loss On Disposal Of Property Plant And Equipment LossOnDisposalOfPropertyPlantAndEquipment	0	usd
CY2022	bfst	Loss On Disposal Of Property Plant And Equipment LossOnDisposalOfPropertyPlantAndEquipment	717000	usd
CY2021	bfst	Loss On Disposal Of Property Plant And Equipment LossOnDisposalOfPropertyPlantAndEquipment	4000	usd
CY2023	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	1240000	usd
CY2022	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	682000	usd
CY2021	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	7640000	usd
CY2023	us-gaap	Increase Decrease In Federal Funds Sold IncreaseDecreaseInFederalFundsSold	-135528000	usd
CY2022	us-gaap	Increase Decrease In Federal Funds Sold IncreaseDecreaseInFederalFundsSold	211438000	usd
CY2021	us-gaap	Increase Decrease In Federal Funds Sold IncreaseDecreaseInFederalFundsSold	-52892000	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-521141000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-700521000	usd
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-675354000	usd
CY2023	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	444780000	usd
CY2022	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	265827000	usd
CY2021	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	480124000	usd
CY2023	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-1323000	usd
CY2022	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	1087000	usd
CY2021	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	-2704000	usd
CY2023	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	14057000	usd
CY2022	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	-14057000	usd
CY2021	us-gaap	Increase Decrease In Federal Funds Purchased IncreaseDecreaseInFederalFundsPurchased	-0	usd
CY2023	bfst	Net Repayments Advances Of Federal Home Loan Bank Borrowings NetRepaymentsAdvancesOfFederalHomeLoanBankBorrowings	-198902000	usd
CY2022	bfst	Net Repayments Advances Of Federal Home Loan Bank Borrowings NetRepaymentsAdvancesOfFederalHomeLoanBankBorrowings	327203000	usd
CY2021	bfst	Net Repayments Advances Of Federal Home Loan Bank Borrowings NetRepaymentsAdvancesOfFederalHomeLoanBankBorrowings	39022000	usd
CY2023	bfst	Proceeds From Secured Loan Under Bank Term Funding Program ProceedsFromSecuredLoanUnderBankTermFundingProgram	300000000	usd
CY2022	bfst	Proceeds From Secured Loan Under Bank Term Funding Program ProceedsFromSecuredLoanUnderBankTermFundingProgram	0	usd
CY2021	bfst	Proceeds From Secured Loan Under Bank Term Funding Program ProceedsFromSecuredLoanUnderBankTermFundingProgram	0	usd
CY2023	bfst	Proceeds From Repayments Of Shortterm Debt Excluding Securities Sold Under Agreements To Repurchase And Federal Funds ProceedsFromRepaymentsOfShorttermDebtExcludingSecuritiesSoldUnderAgreementsToRepurchaseAndFederalFunds	0	usd
CY2022	bfst	Proceeds From Repayments Of Shortterm Debt Excluding Securities Sold Under Agreements To Repurchase And Federal Funds ProceedsFromRepaymentsOfShorttermDebtExcludingSecuritiesSoldUnderAgreementsToRepurchaseAndFederalFunds	-11000	usd
CY2021	bfst	Proceeds From Repayments Of Shortterm Debt Excluding Securities Sold Under Agreements To Repurchase And Federal Funds ProceedsFromRepaymentsOfShorttermDebtExcludingSecuritiesSoldUnderAgreementsToRepurchaseAndFederalFunds	-5000000	usd
CY2023	us-gaap	Proceeds From Repayments Of Secured Debt ProceedsFromRepaymentsOfSecuredDebt	0	usd
CY2022	us-gaap	Proceeds From Repayments Of Secured Debt ProceedsFromRepaymentsOfSecuredDebt	0	usd
CY2021	us-gaap	Proceeds From Repayments Of Secured Debt ProceedsFromRepaymentsOfSecuredDebt	-6000000	usd
CY2023	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0	usd
CY2022	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0	usd
CY2021	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	52500000	usd
CY2023	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	8900000	usd
CY2022	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	-0	usd
CY2021	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	-0	usd
CY2023	bfst	Gain Loss On Extinguishment Of Debt Financing Activities GainLossOnExtinguishmentOfDebtFinancingActivities	1458000	usd
CY2022	bfst	Gain Loss On Extinguishment Of Debt Financing Activities GainLossOnExtinguishmentOfDebtFinancingActivities	-0	usd
CY2021	bfst	Gain Loss On Extinguishment Of Debt Financing Activities GainLossOnExtinguishmentOfDebtFinancingActivities	-0	usd
CY2023	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	0	usd
CY2022	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	71930000	usd
CY2021	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	0	usd
CY2023	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	usd
CY2022	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	48492000	usd
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	3564000	usd
CY2023	bfst	Payments For Surrendered Shares Of Options Exercised PaymentsForSurrenderedSharesOfOptionsExercised	-0	usd
CY2022	bfst	Payments For Surrendered Shares Of Options Exercised PaymentsForSurrenderedSharesOfOptionsExercised	1102000	usd
CY2021	bfst	Payments For Surrendered Shares Of Options Exercised PaymentsForSurrenderedSharesOfOptionsExercised	2992000	usd
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	-0	usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	-0	usd
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	10923000	usd
CY2023	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	5401000	usd
CY2022	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	1350000	usd
CY2021	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	-0	usd
CY2023	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	12655000	usd
CY2022	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	10824000	usd
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	9436000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	502084000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	715309000	usd
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	538155000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	73370000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	84365000	usd
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-80756000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	152740000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	68375000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	149131000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	226110000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	152740000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	68375000	usd
CY2023	bfst	Interest On Deposits InterestOnDeposits	104811000	usd
CY2022	bfst	Interest On Deposits InterestOnDeposits	23846000	usd
CY2021	bfst	Interest On Deposits InterestOnDeposits	13249000	usd
CY2023	bfst	Interest Paid On Borrowings Net InterestPaidOnBorrowingsNet	20638000	usd
CY2022	bfst	Interest Paid On Borrowings Net InterestPaidOnBorrowingsNet	11953000	usd
CY2021	bfst	Interest Paid On Borrowings Net InterestPaidOnBorrowingsNet	4450000	usd
CY2023	us-gaap	Income Taxes Paid IncomeTaxesPaid	16095000	usd
CY2022	us-gaap	Income Taxes Paid IncomeTaxesPaid	13550000	usd
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	15711000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	10441000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-93466000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-14607000	usd
CY2023	bfst	Oci Equity Securities Availableforsale Unrealized Holding Gain Loss Before Adjustment And Tax OciEquitySecuritiesAvailableforsaleUnrealizedHoldingGainLossBeforeAdjustmentAndTax	-782000	usd
CY2022	bfst	Oci Equity Securities Availableforsale Unrealized Holding Gain Loss Before Adjustment And Tax OciEquitySecuritiesAvailableforsaleUnrealizedHoldingGainLossBeforeAdjustmentAndTax	874000	usd
CY2021	bfst	Oci Equity Securities Availableforsale Unrealized Holding Gain Loss Before Adjustment And Tax OciEquitySecuritiesAvailableforsaleUnrealizedHoldingGainLossBeforeAdjustmentAndTax	-336000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	-2040000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	19565000	usd
CY2021	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	3138000	usd
CY2023	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1339000	usd
CY2022	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	719000	usd
CY2021	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1420000	usd
CY2023	bfst	Noncash Or Part Noncash Acquisition Identifiable Assets Acquired NoncashOrPartNoncashAcquisitionIdentifiableAssetsAcquired	0	usd
CY2022	bfst	Noncash Or Part Noncash Acquisition Identifiable Assets Acquired NoncashOrPartNoncashAcquisitionIdentifiableAssetsAcquired	531510000	usd
CY2021	bfst	Noncash Or Part Noncash Acquisition Identifiable Assets Acquired NoncashOrPartNoncashAcquisitionIdentifiableAssetsAcquired	1343000	usd
CY2023	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	0	usd
CY2022	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	3875000	usd
CY2021	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	4300000	usd
CY2023	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	0	usd
CY2022	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	508991000	usd
CY2021	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	6000	usd
CY2023	bfst	Noncash Or Part Noncash Acquisition Assets Acquired Liabilities Assumed NoncashOrPartNoncashAcquisitionAssetsAcquiredLiabilitiesAssumed	0	usd
CY2022	bfst	Noncash Or Part Noncash Acquisition Assets Acquired Liabilities Assumed NoncashOrPartNoncashAcquisitionAssetsAcquiredLiabilitiesAssumed	26394000	usd
CY2021	bfst	Noncash Or Part Noncash Acquisition Assets Acquired Liabilities Assumed NoncashOrPartNoncashAcquisitionAssetsAcquiredLiabilitiesAssumed	5637000	usd
CY2023	us-gaap	Notes Issued1 NotesIssued1	0	usd
CY2022	us-gaap	Notes Issued1 NotesIssued1	0	usd
CY2021	us-gaap	Notes Issued1 NotesIssued1	3927000	usd
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt 0pt 0pt 15pt;"><span style="text-decoration: underline; ">Estimates</span></p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt 0pt 0pt 15pt;">Preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying disclosures. These estimates are based on management’s best knowledge of current events and actions the Company <em style="font: inherit;"> may </em>undertake in the future. Critical accounting estimates that are particularly susceptible to significant change for the Company include the determination of the acquired loans and allowance for credit losses and purchase accounting adjustments (other than loans). Other estimates include goodwill, fair value of financial instruments, investment securities and the assessment of income taxes. Management does <em style="font: inherit;">not</em> anticipate any material changes to estimates in the near term. Factors that <em style="font: inherit;"> may </em>cause sensitivity to the aforementioned estimates include but are <em style="font: inherit;">not</em> limited to: external market factors such as market interest rates and employment rates, changes to operating policies and procedures, economic conditions in the Company’s markets, and changes in applicable banking regulations. Actual results <em style="font: inherit;"> may </em>ultimately differ from estimates.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt 0pt 0pt 15pt;">The Bank’s loans are generally secured by specific items of collateral including real property, business assets, and consumer assets. Although the Bank has a diversified loan portfolio, a substantial portion of its debtors’ ability to honor their contracts is dependent on local economic conditions in the Bank’s market area.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt 0pt 0pt 15pt;">While management uses available information to recognize losses on loans, further reductions in the carrying amounts of loans <em style="font: inherit;"> may </em>be necessary based on changes in local economic conditions. In addition, regulatory agencies, as an integral part of their examination process, periodically review the estimated losses on loans. Such agencies <em style="font: inherit;"> may </em>require the Bank to recognize additional losses based on their judgments about information available to them at the time of their examination.</p> <div> </div> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt 0pt 0pt 15pt;">Because of these factors, it is reasonably possible that the estimated losses on loans <em style="font: inherit;"> may </em>change materially in the near term. However, the amount of the change that is reasonably possible cannot be estimated.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p>
CY2023Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	0	usd
CY2023Q4	us-gaap	Trading Securities TradingSecurities	0	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	708113000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	890751000	usd
CY2023	us-gaap	Advertising Expense AdvertisingExpense	4600000	usd
CY2022	us-gaap	Advertising Expense AdvertisingExpense	3900000	usd
CY2021	us-gaap	Advertising Expense AdvertisingExpense	2700000	usd
CY2023	us-gaap	Reclassifications Reclassifications	<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"><b>Note <em style="font: inherit;">2</em> </b>–<b> Reclassifications </b>–</p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt;"> </p> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt 0pt 0pt 15pt; text-align: justify;">Certain reclassifications <em style="font: inherit;"> may </em>have been made to the prior years’ financial statements in order to conform to the classifications adopted for reporting in <em style="font: inherit;">2023.</em> </p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt 0pt 0pt 15pt; text-align: justify;">Specifically for the adoption of CECL, prior to <em style="font: inherit;"> January 1, 2023, </em>the allowance for credit losses was established based on an incurred loss model. Upon adoption of ASU <em style="font: inherit;">2016</em>-<em style="font: inherit;">13</em> (i.e. ASC <em style="font: inherit;">326</em>), certain loan classification and segmentation categories were changed to align with the requirements of the standard and more effectively model the CECL estimate. The updated CECL segmentation is reflected in the disclosures beginning <em style="font: inherit;"> January 1, 2023. </em>Results from periods prior to <em style="font: inherit;"> January 1, 2023 </em>are presented using the previously applicable GAAP.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family: Times New Roman; font-size: 10pt; font-variant: normal; margin: 0pt 0pt 0pt 15pt; text-align: justify;">These reclassifications have <em style="font: inherit;">no</em> material effect on previously reported shareholders’ equity or net income.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p>
CY2023	us-gaap	Net Income Loss NetIncomeLoss	71043000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	54255000	usd
CY2021	us-gaap	Net Income Loss NetIncomeLoss	52136000	usd
CY2023	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	5401000	usd
CY2022	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	1350000	usd
CY2021	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	0	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	65642000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	52905000	usd
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	52136000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	25079106
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	22633478
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	20502249
CY2023	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	217094
CY2022	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	184015
CY2021	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	132032
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	25296200
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	22817493
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	20634281
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.62
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.34
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.54
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.59
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.32
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.53
CY2022Q4	bfst	Reserve Requirements With Federal Reserve ReserveRequirementsWithFederalReserve	0	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	963978000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1274000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	85681000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	879571000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	985599000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	303000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	95151000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	36978000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	1320000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	84361000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	745091000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	85681000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	312398000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	20007000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	505752000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	75144000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	818150000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	95151000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis	17287000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Next Rolling Twelve Months Fair Value AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue	17126000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis	181791000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Two Through Five Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue	171117000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis	384160000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling Year Six Through Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue	349660000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis	380740000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Rolling After Year Ten Fair Value AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue	341668000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	963978000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	879571000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	629700000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	482700000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	4700000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	4400000	usd
CY2022	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	9000	usd
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	593000	usd
CY2023	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0	usd
CY2023	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	2600000	usd
CY2022	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	57000	usd
CY2021	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	215000	usd
CY2023Q4	us-gaap	Equity Method Investments EquityMethodInvestments	16024000	usd
CY2022Q4	us-gaap	Equity Method Investments EquityMethodInvestments	14242000	usd
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	4992785000	usd
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	4606176000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	40414000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	38178000	usd
CY2023Q4	us-gaap	Notes Receivable Net NotesReceivableNet	4952371000	usd
CY2022Q4	us-gaap	Notes Receivable Net NotesReceivableNet	4567998000	usd
CY2023Q4	us-gaap	Financing Receivable Unamortized Loan Fee Cost FinancingReceivableUnamortizedLoanFeeCost	12600000	usd
CY2022Q4	us-gaap	Financing Receivable Unamortized Loan Fee Cost FinancingReceivableUnamortizedLoanFeeCost	13100000	usd
CY2023Q4	bfst	Loans And Leases Receivable Reclassified From Overdraft LoansAndLeasesReceivableReclassifiedFromOverdraft	2200000	usd
CY2022Q4	bfst	Loans And Leases Receivable Reclassified From Overdraft LoansAndLeasesReceivableReclassifiedFromOverdraft	2000000	usd
CY2023Q4	us-gaap	Principal Amount Outstanding On Loans Securitized PrincipalAmountOutstandingOnLoansSecuritized	723500000	usd
CY2022Q4	us-gaap	Principal Amount Outstanding On Loans Securitized PrincipalAmountOutstandingOnLoansSecuritized	683300000	usd
CY2023Q4	us-gaap	Servicing Asset ServicingAsset	1100000	usd
CY2022Q4	us-gaap	Servicing Asset ServicingAsset	1700000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	38178000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	6429000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	1044000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	4961000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	40414000	usd
CY2022Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	605000	usd
CY2023	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-478000	usd
CY2023Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	3324000	usd
CY2023Q4	bfst	Financing Receivable Allowance For Credit Loss And Offbalancesheet And Unfunded Loan Commitments FinancingReceivableAllowanceForCreditLossAndOffbalancesheetAndUnfundedLoanCommitments	43738000	usd
CY2023Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	4750000	usd
CY2023Q4	bfst	Financing Receivables Allowance For Credit Losses Individually Evaluated For Impairment FinancingReceivablesAllowanceForCreditLossesIndividuallyEvaluatedForImpairment	513000	usd
CY2023Q1	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	12086000	usd
CY2023Q1	bfst	Financing Receivables Allowance For Credit Losses Individually Evaluated For Impairment FinancingReceivablesAllowanceForCreditLossesIndividuallyEvaluatedForImpairment	4210000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	29112000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	2821000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	1001000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Period Increase Decrease FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease	10886000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	38178000	usd
CY2022Q4	bfst	Financing Receivables Allowance For Credit Losses Individually Evaluated For Impairment FinancingReceivablesAllowanceForCreditLossesIndividuallyEvaluatedForImpairment	2214000	usd
CY2022Q4	bfst	Financing Receivables Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivablesAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	35964000	usd
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	4606176000	usd
CY2022Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	14707000	usd
CY2022Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	4541682000	usd
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	4992785000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	6429000	usd
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	4606176000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	127000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	335000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	16900000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	11100000	usd
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	4992785000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	127000	usd
CY2022Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	4606176000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	335000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	16943000	usd
CY2023Q1	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	18088000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	11054000	usd
CY2023Q4	bfst	Financing Receivable Accrued Interest Receivable Loans Deferrals FinancingReceivableAccruedInterestReceivableLoansDeferrals	4200000	usd
CY2022Q4	bfst	Financing Receivable Accrued Interest Receivable Loans Deferrals FinancingReceivableAccruedInterestReceivableLoansDeferrals	5400000	usd
CY2023Q4	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	25200000	usd
CY2022Q4	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	21200000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	120146000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	111388000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	50666000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	48211000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	69480000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	63177000	usd
CY2023	us-gaap	Depreciation And Amortization DepreciationAndAmortization	4700000	usd
CY2022	us-gaap	Depreciation And Amortization DepreciationAndAmortization	4800000	usd
CY2021	us-gaap	Depreciation And Amortization DepreciationAndAmortization	4200000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	88400000	usd
CY2022Q4	us-gaap	Goodwill Goodwill	88500000	usd
CY2023	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	-153000	usd
CY2022	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	28600000	usd
CY2023Q4	us-gaap	Finite Lived Core Deposits Gross FiniteLivedCoreDepositsGross	21100000	usd
CY2022Q4	us-gaap	Finite Lived Core Deposits Gross FiniteLivedCoreDepositsGross	17225000	usd
CY2023	bfst	Finitelived Intangible Assets Adjustment For Sale Of Branch FinitelivedIntangibleAssetsAdjustmentForSaleOfBranch	-50000	usd
CY2022	bfst	Finitelived Intangible Assets Adjustment For Sale Of Branch FinitelivedIntangibleAssetsAdjustmentForSaleOfBranch	0	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	9155000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	7058000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	11895000	usd
CY2022Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	14042000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2100000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2000000	usd
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1600000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	2093000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1885000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1816000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1816000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1539000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	2746000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	11895000	usd
CY2023Q4	us-gaap	Noninterest Bearing Domestic Deposit Demand NoninterestBearingDomesticDepositDemand	1299090000	usd
CY2022Q4	us-gaap	Noninterest Bearing Domestic Deposit Demand NoninterestBearingDomesticDepositDemand	1549381000	usd
CY2023Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	1299090000	usd
CY2022Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	1549381000	usd
CY2023Q4	us-gaap	Interest Bearing Domestic Deposit Demand InterestBearingDomesticDepositDemand	502077000	usd
CY2022Q4	us-gaap	Interest Bearing Domestic Deposit Demand InterestBearingDomesticDepositDemand	455117000	usd
CY2023Q4	us-gaap	Interest Bearing Domestic Deposit Negotiable Order Of Withdrawal Now InterestBearingDomesticDepositNegotiableOrderOfWithdrawalNOW	496845000	usd
CY2022Q4	us-gaap	Interest Bearing Domestic Deposit Negotiable Order Of Withdrawal Now InterestBearingDomesticDepositNegotiableOrderOfWithdrawalNOW	579789000	usd
CY2023Q4	us-gaap	Interest Bearing Domestic Deposit Money Market InterestBearingDomesticDepositMoneyMarket	1425808000	usd
CY2022Q4	us-gaap	Interest Bearing Domestic Deposit Money Market InterestBearingDomesticDepositMoneyMarket	1136597000	usd
CY2023Q4	us-gaap	Interest Bearing Domestic Deposit Savings InterestBearingDomesticDepositSavings	223871000	usd
CY2022Q4	us-gaap	Interest Bearing Domestic Deposit Savings InterestBearingDomesticDepositSavings	312884000	usd
CY2023Q4	bfst	Time Deposits250000 Or More TimeDeposits250000OrMore	623336000	usd
CY2022Q4	bfst	Time Deposits250000 Or More TimeDeposits250000OrMore	279781000	usd
CY2023Q4	us-gaap	Interestbearing Domestic Deposit Other InterestbearingDomesticDepositOther	677763000	usd
CY2022Q4	us-gaap	Interestbearing Domestic Deposit Other InterestbearingDomesticDepositOther	506796000	usd
CY2023Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	3949700000	usd
CY2022Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	3270964000	usd
CY2023Q4	us-gaap	Deposits Deposits	5248790000	usd
CY2022Q4	us-gaap	Deposits Deposits	4820345000	usd
CY2023Q4	bfst	Percentage Of Certificate Of Deposit Maturities Year One PercentageOfCertificateOfDepositMaturitiesYearOne	0.79	pure
CY2023Q4	bfst	Percentage Of Certificate Of Deposit Maturities Year Two And Thereafter PercentageOfCertificateOfDepositMaturitiesYearTwoAndThereafter	0.21	pure
CY2023Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	1000000000	usd
CY2022Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	550200000	usd
CY2023Q4	bfst	Interest Bearing Deposits Public Funds Brokered InterestBearingDepositsPublicFundsBrokered	145900000	usd
CY2022Q4	bfst	Interest Bearing Deposits Public Funds Brokered InterestBearingDepositsPublicFundsBrokered	131900000	usd
CY2023Q4	bfst	Deposits Public Funds Non Brokered DepositsPublicFundsNonBrokered	511600000	usd
CY2022Q4	bfst	Deposits Public Funds Non Brokered DepositsPublicFundsNonBrokered	504100000	usd
CY2023Q4	bfst	Advances From Federal Home Loan Banks Net Of Unaccreted Market Value Adjustment AdvancesFromFederalHomeLoanBanksNetOfUnaccretedMarketValueAdjustment	211200000	usd
CY2022Q4	bfst	Advances From Federal Home Loan Banks Net Of Unaccreted Market Value Adjustment AdvancesFromFederalHomeLoanBanksNetOfUnaccretedMarketValueAdjustment	410100000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	1800000000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds	1200000000	usd
CY2020Q2	bfst	Trust Preferred Securities TrustPreferredSecurities	5000000	usd
CY2023Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	18900000	usd
CY2022Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	20200000	usd
CY2023	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	17491000	usd
CY2022	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	12969000	usd
CY2021	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	13008000	usd
CY2023	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2052000	usd
CY2022	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	1368000	usd
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-586000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	19543000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14337000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12422000	usd
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	19023000	usd
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	14404000	usd
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	13557000	usd
CY2023	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	188000	usd
CY2022	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	690000	usd
CY2021	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	815000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	197000	usd
CY2022	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	16000	usd
CY2021	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount	-220000	usd
CY2023	bfst	Effective Income Tax Rate Reconciliation Goodwill Writeoff EffectiveIncomeTaxRateReconciliationGoodwillWriteoff	32000	usd
CY2022	bfst	Effective Income Tax Rate Reconciliation Goodwill Writeoff EffectiveIncomeTaxRateReconciliationGoodwillWriteoff	0	usd
CY2021	bfst	Effective Income Tax Rate Reconciliation Goodwill Writeoff EffectiveIncomeTaxRateReconciliationGoodwillWriteoff	35000	usd
CY2023	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	479000	usd
CY2022	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	607000	usd
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-135000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	19543000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14337000	usd
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12422000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	2885000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	2285000	usd
CY2023Q4	bfst	Deferred Tax Assets Operating Loss Carryforwards State And Local Valuation Allowance DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocalValuationAllowance	2885000	usd
CY2022Q4	bfst	Deferred Tax Assets Operating Loss Carryforwards State And Local Valuation Allowance DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocalValuationAllowance	2285000	usd
CY2023Q4	bfst	Deferred Tax Assets Operating Loss Carryforwards Excluding State And Local DeferredTaxAssetsOperatingLossCarryforwardsExcludingStateAndLocal	583000	usd
CY2022Q4	bfst	Deferred Tax Assets Operating Loss Carryforwards Excluding State And Local DeferredTaxAssetsOperatingLossCarryforwardsExcludingStateAndLocal	1700000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	17835000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	20040000	usd
CY2023Q4	bfst	Deferred Tax Assets Acquired Loans Fair Market Value Adjustment DeferredTaxAssetsAcquiredLoansFairMarketValueAdjustment	2596000	usd
CY2022Q4	bfst	Deferred Tax Assets Acquired Loans Fair Market Value Adjustment DeferredTaxAssetsAcquiredLoansFairMarketValueAdjustment	5705000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	8539000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	8067000	usd
CY2023Q4	bfst	Deferred Tax Assets Right Of Use Asset DeferredTaxAssetsRightOfUseAsset	4472000	usd
CY2022Q4	bfst	Deferred Tax Assets Right Of Use Asset DeferredTaxAssetsRightOfUseAsset	3731000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	2231000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	1589000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1277000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1135000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1156000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	940000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	38689000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	42907000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	4402000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	3693000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	2513000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	2967000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2409000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2512000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	1209000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	1477000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	833000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1064000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	11366000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	11713000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	27323000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	31194000	usd
CY2023	bfst	Oci Equity Securities Unrealized Holding Gain Loss Before Adjustment After Tax OCIEquitySecuritiesUnrealizedHoldingGainLossBeforeAdjustmentAfterTax	-616000	usd
CY2022	bfst	Oci Equity Securities Unrealized Holding Gain Loss Before Adjustment After Tax OCIEquitySecuritiesUnrealizedHoldingGainLossBeforeAdjustmentAfterTax	690000	usd
CY2023	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.5
CY2022	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.48
CY2023	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	75
CY2022Q4	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	18.75
CY2022Q3	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.075	pure
CY2022Q3	bfst	Proceeds From Issuance Of Preferred Stock ProceedsFromIssuanceOfPreferredStock	72000000	usd
CY2022Q3	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.075	pure
CY2023	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	75
CY2022	us-gaap	Preferred Stock Dividends Per Share Cash Paid PreferredStockDividendsPerShareCashPaid	18.75
CY2023Q4	us-gaap	Capital Capital	754990000	usd
CY2023Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1285	pure
CY2023Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	470215000	usd
CY2023Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.08	pure
CY2023Q4	us-gaap	Capital Required To Be Well Capitalized CapitalRequiredToBeWellCapitalized	587769000	usd
CY2023Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10	pure
CY2023Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	614975000	usd
CY2023Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1046	pure
CY2023Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	352661000	usd
CY2023Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.06	pure
CY2023Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized TierOneRiskBasedCapitalRequiredToBeWellCapitalized	470215000	usd
CY2023Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.08	pure
CY2023Q4	us-gaap	Common Equity Tier One Capital CommonEquityTierOneCapital	538045000	usd
CY2023Q4	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.0915	pure
CY2023Q4	us-gaap	Common Equity Tier One Capital Required For Capital Adequacy CommonEquityTierOneCapitalRequiredForCapitalAdequacy	264496000	usd
CY2023Q4	bfst	Common Equity Tier1capital Required For Capital Adequacy To Risk Weighted Assets CommonEquityTier1capitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.045	pure
CY2023Q4	us-gaap	Common Equity Tier One Capital Required To Be Well Capitalized CommonEquityTierOneCapitalRequiredToBeWellCapitalized	382050000	usd
CY2023Q4	bfst	Common Equity Tier1 Capital Required To Be Well Capitalized To Risk Weighted Assets CommonEquityTier1CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.065	pure
CY2023Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	614975000	usd
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CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3473000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3362000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	3064000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	5617000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	23638000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	2474000	usd
CY2023Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	19500000	usd
CY2022Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	66800000	usd
CY2023Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	51200000	usd
CY2022Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	58000000	usd
CY2023	us-gaap	Loss Contingency Disclosures LossContingencyDisclosures	<p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"><b>Note <em style="font: inherit;">25</em> </b>–<b> Litigation and Contingencies </b>–</p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;margin:0pt;"> </p> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:justify;margin:0pt 0pt 0pt 15pt;">In the normal course of business, the Bank is involved in various legal proceedings. In the opinion of management and counsel, the disposition or ultimate resolution of such proceedings would <em style="font: inherit;">not</em> have a material adverse effect on the Bank’s financial statements.</p> <p style="font-family:'Times New Roman';font-size:10pt;font-variant:normal;margin:0pt;"> </p>
CY2023	dei	Auditor Name AuditorName	FORVIS, LLP
CY2023	dei	Auditor Firm AuditorFirmId	686
CY2023	dei	Auditor Location AuditorLocation	Fort Worth, TX

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2024 Q1 Form 10-K Financial Statement

#000143774924006270 Filed on March 01, 2024

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Balance Sheet

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$BFST Business First Bancshares Inc Stock $bfst

2024 Q1 Form 10-K Financial Statement

#000143774924006270 Filed on March 01, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BFST
Business First Bancshares Inc Stock $bfst