$FGBI
First Guaranty Bancshares, Inc. Stock $fgbi

$fgbi Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000140853422000022 Filed on March 16, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue		$111.9M
YoY Change		11.16%
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	$1.370M	$3.400M	$1.270M
YoY Change	7.87%	21.43%	51.19%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense		$22.30M
YoY Change		-14.29%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$10.16M	$34.46M	$7.670M
YoY Change	32.46%	34.92%	51.88%
Income Tax	$2.120M	$7.158M	$1.540M
% Of Pretax Income	20.87%	20.77%	20.08%
Net Earnings	$8.050M	$27.30M	$6.130M
YoY Change	31.32%	34.35%	51.36%
Net Earnings / Revenue		24.39%
Basic Earnings Per Share		$2.42
Diluted Earnings Per Share	$750.9K	$2.551M	$629.4K
COMMON SHARES
Basic Shares Outstanding	9.741M shares	10.72M shares	9.741M shares
Diluted Shares Outstanding

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$626.1M		$538.2M
YoY Change	16.34%		8.95%
Cash & Equivalents	$261.9M		$299.6M
Short-Term Investments	$364.2M		$238.5M
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$58.64M	$58.60M	$59.89M
YoY Change	-2.1%	-2.17%	6.07%
Goodwill	$12.90M		$12.90M
YoY Change	0.0%		0.0%
Intangibles	$5.922M		$6.587M
YoY Change	-10.1%		-8.08%
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	$2.878B	$2.878B	$2.473B
YoY Change	16.38%	16.38%	16.81%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$4.500M	$4.500M	$5.300M
YoY Change	-15.09%	-15.09%	-11.67%
Deferred Revenue
YoY Change
Short-Term Debt	$6.439M	$6.400M	$56.12M
YoY Change	-88.53%	4.92%	181.75%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$4.500M	$4.500M	$5.300M
YoY Change	-15.09%	-15.09%	-11.67%
LONG-TERM LIABILITIES
Long-Term Debt	$40.00M	$40.00M	$57.10M
YoY Change	-29.95%	-29.95%	-9.79%
Other Long-Term Liabilities	$3.600M	$3.600M	$6.200M
YoY Change	-41.94%	-41.94%	14.81%
Total Long-Term Liabilities	$43.60M	$43.60M	$63.30M
YoY Change	-31.12%	-31.12%	-7.86%
TOTAL LIABILITIES
Total Short-Term Liabilities	$4.500M	$4.500M	$5.300M
Total Long-Term Liabilities	$43.60M	$43.60M	$63.30M
Total Liabilities	$2.654B	$2.654B	$2.294B
YoY Change	15.68%	15.68%	17.59%
SHAREHOLDERS EQUITY
Retained Earnings	$56.65M		$37.13M
YoY Change	52.57%		-14.21%
Common Stock	$140.8M		$140.8M
YoY Change	0.0%		16.78%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$223.9M	$223.9M	$178.6M
YoY Change
Total Liabilities & Shareholders Equity	$2.878B	$2.878B	$2.473B
YoY Change	16.38%	16.38%	16.81%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$8.050M	$27.30M	$6.130M
YoY Change	31.32%	34.35%	51.36%
Depreciation, Depletion And Amortization	$1.370M	$3.400M	$1.270M
YoY Change	7.87%	21.43%	51.19%
Cash From Operating Activities	$17.59M	$26.52M	$9.440M
YoY Change	86.33%	11.62%	22.12%
INVESTING ACTIVITIES
Capital Expenditures	-$170.0K	$2.204M	-$2.040M
YoY Change	-91.67%	-65.09%	-48.74%
Acquisitions
YoY Change
Other Investing Activities	-$74.60M	-$450.4M	$130.7M
YoY Change	-157.06%	268.79%	-167.66%
Cash From Investing Activities	-$74.78M	-$452.6M	$128.7M
YoY Change	-158.11%	252.38%	-165.25%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$0.00
YoY Change
Debt Paid & Issued, Net		$17.32M
YoY Change		174.85%
Cash From Financing Activities	49.34M	$388.5M	-30.83M
YoY Change	-260.04%	15.31%	-139.56%
NET CHANGE
Cash From Operating Activities	17.59M	$26.52M	9.440M
Cash From Investing Activities	-74.78M	-$452.6M	128.7M
Cash From Financing Activities	49.34M	$388.5M	-30.83M
Net Change In Cash	-7.850M	-$37.67M	107.3M
YoY Change	-107.32%	-116.23%	-196.18%
FREE CASH FLOW
Cash From Operating Activities	$17.59M	$26.52M	$9.440M
Capital Expenditures	-$170.0K	$2.204M	-$2.040M
Free Cash Flow	$17.76M	$24.32M	$11.48M
YoY Change	54.7%	39.38%	-1.96%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0001408534
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	001-37621
CY2021	dei	Entity Registrant Name EntityRegistrantName	FIRST GUARANTY BANCSHARES, INC.
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	LA
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	26-0513559
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	400 East Thomas Street
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Hammond,
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	LA
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	70401
CY2021	dei	City Area Code CityAreaCode	(985)
CY2021	dei	Local Phone Number LocalPhoneNumber	345-7685
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	true
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021Q2	dei	Entity Public Float EntityPublicFloat	99900000	USD
CY2022Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	10716796	shares
CY2021	dei	Auditor Name AuditorName	Castaing, Hussey & Lolan, LLC
CY2021	dei	Auditor Location AuditorLocation	New Iberia, Louisiana
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CY2020	us-gaap	Net Income Loss NetIncomeLoss	20318000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	27297000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	14241000	USD
CY2021	us-gaap	Dividends Preferred Stock DividendsPreferredStock	1384000	USD
CY2020	us-gaap	Dividends Preferred Stock DividendsPreferredStock	0	USD
CY2019	us-gaap	Dividends Preferred Stock DividendsPreferredStock	0	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	25913000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	20318000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	14241000	USD
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.42
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.90
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.34
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.60
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.58
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.54
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	10716796	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	10716796	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	10666055	shares
CY2021Q4	fgbi	Dividends Common Stock Paid In Kind Percent DividendsCommonStockPaidInKindPercent	0.10
CY2021	us-gaap	Net Income Loss NetIncomeLoss	27297000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	20318000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	14241000	USD
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-8501000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	12757000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	11435000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	714000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	14791000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-353000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesBeforeTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesBeforeTax	100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Writedown Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesBeforeTax	0	USD
CY2021	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	-9215000	USD
CY2020	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	-1934000	USD
CY2019	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentBeforeTaxPortionAttributableToParent	11788000	USD
CY2021	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-1935000	USD
CY2020	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	-406000	USD
CY2019	us-gaap	Other Comprehensive Income Availableforsale Securities Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesTaxPortionAttributableToParent	2475000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-7280000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1528000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9313000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	20017000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	18790000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	23554000	USD
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1000
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1000
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	147284000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	14241000	USD
CY2019	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	59551	shares
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	9313000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.54
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	5803000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	166035000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	20318000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1528000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.58
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	6234000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	178591000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	27297000	USD
CY2021	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	34500	shares
CY2021	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	33058000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-7280000	USD
CY2021	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	6393000	USD
CY2021	us-gaap	Dividends Preferred Stock Stock DividendsPreferredStockStock	1384000	USD
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.60
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	223889000	USD
CY2021Q4	fgbi	Dividends Common Stock Paid In Kind Percent DividendsCommonStockPaidInKindPercent	0.10
CY2021	us-gaap	Net Income Loss NetIncomeLoss	27297000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	20318000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	14241000	USD
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	2055000	USD
CY2020	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	14877000	USD
CY2019	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	4860000	USD
CY2021	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	4775000	USD
CY2020	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	3781000	USD
CY2019	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	3057000	USD
CY2021	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	104000	USD
CY2020	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-2594000	USD
CY2019	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1347000	USD
CY2021	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	714000	USD
CY2020	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	14791000	USD
CY2019	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-157000	USD
CY2021	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Heldtomaturity Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetHeldtomaturitySecurities	0	USD
CY2020	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Heldtomaturity Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetHeldtomaturitySecurities	100000	USD
CY2019	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Heldtomaturity Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetHeldtomaturitySecurities	0	USD
CY2021	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	965000	USD
CY2020	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	1054000	USD
CY2019	us-gaap	Gains Losses On Sales Of Assets GainsLossesOnSalesOfAssets	1304000	USD
CY2021	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-536000	USD
CY2020	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-1245000	USD
CY2019	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-90000	USD
CY2021	fgbi	Fhlb Stock Dividends FhlbStockDividends	13000	USD
CY2020	fgbi	Fhlb Stock Dividends FhlbStockDividends	43000	USD
CY2019	fgbi	Fhlb Stock Dividends FhlbStockDividends	63000	USD
CY2021	us-gaap	Increase Decrease In Loans Held For Sale IncreaseDecreaseInLoansHeldForSale	0	USD
CY2020	us-gaap	Increase Decrease In Loans Held For Sale IncreaseDecreaseInLoansHeldForSale	0	USD
CY2019	us-gaap	Increase Decrease In Loans Held For Sale IncreaseDecreaseInLoansHeldForSale	-344000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	6347000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	3268000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-6349000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	26520000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	23759000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	29078000	USD
CY2021	us-gaap	Proceeds From Sale And Maturity Of Held To Maturity Securities ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities	0	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Held To Maturity Securities ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities	34022000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Held To Maturity Securities ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities	21190000	USD
CY2021	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	417557000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	1242559000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	279590000	USD
CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	551563000	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1078450000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	274437000	USD
CY2021	us-gaap	Payments To Acquire Trust Preferred Investments PaymentsToAcquireTrustPreferredInvestments	1000000	USD
CY2020	us-gaap	Payments To Acquire Trust Preferred Investments PaymentsToAcquireTrustPreferredInvestments	0	USD
CY2019	us-gaap	Payments To Acquire Trust Preferred Investments PaymentsToAcquireTrustPreferredInvestments	0	USD
CY2021	fgbi	Proceeds From Redemption Of Investment In Preferred Securities ProceedsFromRedemptionOfInvestmentInPreferredSecurities	1500000	USD
CY2020	fgbi	Proceeds From Redemption Of Investment In Preferred Securities ProceedsFromRedemptionOfInvestmentInPreferredSecurities	0	USD
CY2019	fgbi	Proceeds From Redemption Of Investment In Preferred Securities ProceedsFromRedemptionOfInvestmentInPreferredSecurities	0	USD
CY2021	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	2160000	USD
CY2020	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	0	USD
CY2019	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	0	USD
CY2021	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	155000	USD
CY2020	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	0	USD
CY2019	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	0	USD
CY2021	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	320347000	USD
CY2020	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	322745000	USD
CY2019	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	123553000	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2204000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	6313000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	11933000	USD
CY2021	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	77000	USD
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	127000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	12000	USD
CY2021	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	1330000	USD
CY2020	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	2345000	USD
CY2019	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	550000	USD
CY2021	fgbi	Cash Paid In Excess Of Cash Received In Acquisition CashPaidInExcessOfCashReceivedInAcquisition	0	USD
CY2020	fgbi	Cash Paid In Excess Of Cash Received In Acquisition CashPaidInExcessOfCashReceivedInAcquisition	0	USD
CY2019	fgbi	Cash Paid In Excess Of Cash Received In Acquisition CashPaidInExcessOfCashReceivedInAcquisition	23325000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-452645000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-128455000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-131906000	USD
CY2021	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	430174000	USD
CY2020	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	313210000	USD
CY2019	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	18408000	USD
CY2021	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-49682000	USD
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	36202000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-28000	USD
CY2021	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	32465000	USD
CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	17321000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	6302000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	3754000	USD
CY2021	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	33058000	USD
CY2020	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Preferred Stock And Preference Stock ProceedsFromIssuanceOfPreferredStockAndPreferenceStock	0	USD
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1000000	USD
CY2021	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	1384000	USD
CY2020	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	0	USD
CY2019	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	0	USD
CY2021	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	6393000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	6234000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	5803000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	388452000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	336876000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	42288000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-37673000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	232180000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-60540000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	299605000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	67425000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	127965000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	261932000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	299605000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	67425000	USD
CY2021	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1782000	USD
CY2020	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	951000	USD
CY2019	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	2789000	USD
CY2021	us-gaap	Debt Securities Held To Maturity Transfer Amount DebtSecuritiesHeldToMaturityTransferAmount	0	USD
CY2020	us-gaap	Debt Securities Held To Maturity Transfer Amount DebtSecuritiesHeldToMaturityTransferAmount	52553000	USD
CY2019	us-gaap	Debt Securities Held To Maturity Transfer Amount DebtSecuritiesHeldToMaturityTransferAmount	0	USD
CY2021	fgbi	Debt Securities Available For Sale Transfer Amount DebtSecuritiesAvailableForSaleTransferAmount	160014000	USD
CY2020	fgbi	Debt Securities Available For Sale Transfer Amount DebtSecuritiesAvailableForSaleTransferAmount	0	USD
CY2019	fgbi	Debt Securities Available For Sale Transfer Amount DebtSecuritiesAvailableForSaleTransferAmount	0	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	23111000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	26772000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	27871000	USD
CY2019Q4	fgbi	Common Stock Dividend Percentage CommonStockDividendPercentage	0.10
CY2021	fgbi	Number Of Banking Offices NumberOfBankingOffices	36	office
CY2021	fgbi	Number Of Automated Teller Machines NumberOfAutomatedTellerMachines	49	atm
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<div><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-style:italic;font-weight:700;line-height:120%">Use of estimates</span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:120%">The preparation of financial statements in conformity with generally accepted accounting principles requires Management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the dates of the financial statements and the reported amounts of revenue and expense during the reporting periods. 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 and lease losses, the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans, and the valuation of investment securities. In connection with the determination of the allowance for loan and lease losses and real estate owned, First Guaranty obtains independent appraisals for significant properties.</span></div>
CY2021	fgbi	Period Past Due After Which Evaluation Is Made For Discontinuation Of Interest Accrual On Loan PeriodPastDueAfterWhichEvaluationIsMadeForDiscontinuationOfInterestAccrualOnLoan	P90D
CY2021	fgbi	Period Of Payment Performance After Which Loans Are Returned To Accrual Status PeriodOfPaymentPerformanceAfterWhichLoansAreReturnedToAccrualStatus	P6M
CY2021	fgbi	Period Of Performance After Which Company Evaluates Td Rs That Have Subsequently Been Restructured And Returned To Market Terms PeriodOfPerformanceAfterWhichCompanyEvaluatesTDRsThatHaveSubsequentlyBeenRestructuredAndReturnedToMarketTerms	P6M
CY2021Q4	fgbi	Minimum Balance Of Impaired Loans Over Which Impairment Method Is Applied MinimumBalanceOfImpairedLoansOverWhichImpairmentMethodIsApplied	500000	USD
CY2021	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	segment
CY2021	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-style:italic;font-weight:700;line-height:120%">Reclassifications</span></div><div><span><br/></span></div><div style="text-align:justify"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:120%">Certain reclassifications have been made to prior year end financial statements in order to conform to the classification adopted for reporting in 2021.</span></div>
CY2020Q4	fgbi	Federal Reserve Required Cash Deposit FederalReserveRequiredCashDeposit	0	USD
CY2021Q4	fgbi	Federal Reserve Required Cash Deposit FederalReserveRequiredCashDeposit	0	USD
CY2021Q4	fgbi	Number Of Accounts That Exceeded Fdic Insurable Limit NumberOfAccountsThatExceededFDICInsurableLimit	3	account
CY2021Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	2000000	USD
CY2020Q4	fgbi	Number Of Accounts That Exceeded Fdic Insurable Limit NumberOfAccountsThatExceededFDICInsurableLimit	0	account
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	212196000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	898000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	2474000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	210620000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	237728000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1493000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	673000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	238548000	USD
CY2021Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	153536000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	0	USD
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	2951000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	150585000	USD
CY2020Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	0	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Transfer To Trading Loss DebtSecuritiesAvailableForSaleTransferToTradingLoss	5700000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	641000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	643000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	3885000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	3759000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	82320000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	81390000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	124774000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	124242000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	211620000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	210034000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	576000	USD
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	49700000	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	394900000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	586000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	212196000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	210620000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	0	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	0	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	0	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	0	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	19445000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	19122000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	134091000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	131463000	USD
CY2021Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	153536000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	150585000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	75	loan
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	177727000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	2300000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	8	loan
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	454000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	174000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	83	loan
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	178181000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	2474000	USD
CY2021Q4	fgbi	Held To Maturity Securities In Unrealized Loss Positions Less Than Twelve Months Qualitative Disclosure Number Of Positions HeldToMaturitySecuritiesInUnrealizedLossPositionsLessThanTwelveMonthsQualitativeDisclosureNumberOfPositions	16	loan
CY2021	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	600000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	150585000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	2951000	USD
CY2021Q4	fgbi	Held To Maturity Securities In Unrealized Loss Positions More Than Twelve Months Qualitative Disclosure Number Of Positions HeldToMaturitySecuritiesInUnrealizedLossPositionsMoreThanTwelveMonthsQualitativeDisclosureNumberOfPositions	0	loan
CY2021Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	0	USD
CY2021Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	0	USD
CY2021Q4	us-gaap	Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	16	loan
CY2021Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	150585000	USD
CY2021Q4	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	2951000	USD
CY2021Q4	fgbi	Debt Securities Held To Maturity Number Of Securities With Other Than Temporary Impairment Loss DebtSecuritiesHeldToMaturityNumberOfSecuritiesWithOtherThanTemporaryImpairmentLoss	0	security
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	30	loan
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	141807000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	549000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	10	loan
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	1265000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	124000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	90500000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	40	loan
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	143072000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	673000	USD
CY2021Q4	fgbi	Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions SecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	99	security
CY2021Q4	fgbi	Debt Securities Continuous Unrealized Loss Position Accumulated Loss As Percentage Of All Individual Securities Amortized Cost Basis DebtSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAsPercentageOfAllIndividualSecuritiesAmortizedCostBasis	0.016
CY2021Q4	fgbi	Debt Securities Continuous Unrealized Loss Position Accumulated Loss As Percentage Of Investment Securities Portfolio DebtSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAsPercentageOfInvestmentSecuritiesPortfolio	0.015
CY2021Q4	fgbi	Securities In Unrealized Loss Positions More Than Twelve Months Qualitative Disclosure Number Of Positions SecuritiesInUnrealizedLossPositionsMoreThanTwelveMonthsQualitativeDisclosureNumberOfPositions	8	security
CY2021Q4	fgbi	Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions SecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions	99	security
CY2021Q4	fgbi	Securities In Unrealized Loss Positions More Than Twelve Months Qualitative Disclosure Number Of Positions SecuritiesInUnrealizedLossPositionsMoreThanTwelveMonthsQualitativeDisclosureNumberOfPositions	8	security
CY2021Q4	fgbi	Securities Continuous Unrealized Loss Position Twelve Months Or Longer Amortized Cost Basis SecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCostBasis	600000	USD
CY2021Q4	fgbi	Securities Continuous Unrealized Loss Position Accumulated Loss SecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	200000	USD
CY2021	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	6600000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	100000	USD
CY2020Q4	fgbi	Debt Securities Held To Maturity Number Of Securities With Other Than Temporary Impairment Loss DebtSecuritiesHeldToMaturityNumberOfSecuritiesWithOtherThanTemporaryImpairmentLoss	1	security
CY2020	us-gaap	Impairment Of Investments ImpairmentOfInvestments	100000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Originated In Current Fiscal Year DebtSecuritiesHeldToMaturityOriginatedInCurrentFiscalYear	100000	USD
CY2019	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	0	USD
CY2020Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	100000	USD
CY2019Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	0	USD
CY2018Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	60000	USD
CY2021	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment		USD
CY2020	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	100000	USD
CY2019	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	0	USD
CY2021	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	0	USD
CY2020	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	0	USD
CY2019	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	0	USD
CY2021	fgbi	Proceedsfrom Saleof Debt Securities Availableforsale Tax ProceedsfromSaleofDebtSecuritiesAvailableforsaleTax	100000	USD
CY2020	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	600000	USD
CY2020	fgbi	Proceedsfrom Saleof Debt Securities Availableforsale Tax ProceedsfromSaleofDebtSecuritiesAvailableforsaleTax	3100000	USD
CY2021	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Cash Flows OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows	0	USD
CY2020	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Cash Flows OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows	0	USD
CY2019	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Cash Flows OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows	0	USD
CY2021	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	100000	USD
CY2020	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	0	USD
CY2019	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	60000	USD
CY2021Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	0	USD
CY2020Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	100000	USD
CY2019Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	0	USD
CY2019	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	0	USD
CY2020	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	0	USD
CY2021	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	0	USD
CY2021Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Securities Pledged PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged	234900000	USD
CY2020Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Securities Pledged PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged	184000000	USD
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	1000000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	14700000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	800000	USD
CY2021	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	400000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	1100000	USD
CY2019	fgbi	Proceedsfrom Saleof Debt Securities Availableforsale Tax ProceedsfromSaleofDebtSecuritiesAvailableforsaleTax	-79000	USD
CY2020	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	11700000	USD
CY2021Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	2166048000	USD
CY2021Q4	fgbi	Financing Receivable Ratio Of Individual Loans Receivable To All Loans Before Unearned Income FinancingReceivableRatioOfIndividualLoansReceivableToAllLoansBeforeUnearnedIncome	1.000
CY2020Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1849172000	USD
CY2020Q4	fgbi	Financing Receivable Ratio Of Individual Loans Receivable To All Loans Before Unearned Income FinancingReceivableRatioOfIndividualLoansReceivableToAllLoansBeforeUnearnedIncome	1.000
CY2021Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	6689000	USD
CY2020Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	5037000	USD
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	2159359000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	1844135000	USD
CY2021Q4	fgbi	Financing Receivables That Are Maturing After One Year Or Less FinancingReceivablesThatAreMaturingAfterOneYearOrLess	357120000	USD
CY2020Q4	fgbi	Financing Receivables That Are Maturing After One Year Or Less FinancingReceivablesThatAreMaturingAfterOneYearOrLess	265932000	USD
CY2021Q4	fgbi	Financing Receivables That Are Maturing After One Year But Not More Than Five Years FinancingReceivablesThatAreMaturingAfterOneYearButNotMoreThanFiveYears	1312149000	USD
CY2020Q4	fgbi	Financing Receivables That Are Maturing After One Year But Not More Than Five Years FinancingReceivablesThatAreMaturingAfterOneYearButNotMoreThanFiveYears	1108617000	USD
CY2021Q4	fgbi	Financing Receivables That Are Maturing After Five Years But Not More Than Fifteen Years FinancingReceivablesThatAreMaturingAfterFiveYearsButNotMoreThanFifteenYears	221555000	USD
CY2020Q4	fgbi	Financing Receivables That Are Maturing After Five Years But Not More Than Fifteen Years FinancingReceivablesThatAreMaturingAfterFiveYearsButNotMoreThanFifteenYears	219892000	USD
CY2021Q4	fgbi	Financing Receivables That Are Maturing After Fifteen Years FinancingReceivablesThatAreMaturingAfterFifteenYears	258509000	USD
CY2020Q4	fgbi	Financing Receivables That Are Maturing After Fifteen Years FinancingReceivablesThatAreMaturingAfterFifteenYears	239155000	USD
CY2021Q4	fgbi	Financing Receivable Gross Carrying Amount Net Nonaccrual FinancingReceivableGrossCarryingAmountNetNonaccrual	2149333000	USD
CY2020Q4	fgbi	Financing Receivable Gross Carrying Amount Net Nonaccrual FinancingReceivableGrossCarryingAmountNetNonaccrual	1833596000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	16715000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	15576000	USD
CY2021Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	2166048000	USD
CY2020Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1849172000	USD
CY2021Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	6689000	USD
CY2020Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	5037000	USD
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	2159359000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	1844135000	USD
CY2021Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	2166048000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	1245000	USD
CY2021Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	6689000	USD
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	2159359000	USD
CY2020Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1849172000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	13091000	USD
CY2020Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	5037000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	1844135000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	16700000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	15600000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	16715000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	15576000	USD
CY2021Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	2166048000	USD
CY2020Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1849172000	USD
CY2021Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	6689000	USD
CY2020Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	5037000	USD
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	2159359000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	1844135000	USD
CY2021Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Outstanding Balance CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance	5143000	USD
CY2020Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Outstanding Balance CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance	9155000	USD
CY2021	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Provision For Loan Losses1 CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesProvisionForLoanLosses1	700000	USD
CY2020	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Provision For Loan Losses1 CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesProvisionForLoanLosses1	500000	USD
CY2020Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	2892000	USD
CY2019Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	3647000	USD
CY2021	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Additions CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions	0	USD
CY2020	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Additions CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAdditions	30000	USD
CY2021	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	514000	USD
CY2020	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	785000	USD
CY2021	us-gaap	Impairment Of Intangible Assets Indefinitelived Excluding Goodwill ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill	0	USD
CY2021	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications To From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference	0	USD
CY2020	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Reclassifications To From Nonaccretable Difference CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldReclassificationsToFromNonaccretableDifference	0	USD
CY2021Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	2378000	USD
CY2020Q4	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield	2892000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	24518000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3122000	USD
CY2021	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	578000	USD
CY2021	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	2055000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	24029000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	10929000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	2427000	USD
CY2020	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	1139000	USD
CY2020	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	14877000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	24518000	USD
CY2019Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	91000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	10776000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	5264000	USD
CY2019	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	557000	USD
CY2019	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	4860000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	10929000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	2171000	USD
CY2021Q4	fgbi	Financing Receivable Allowance For Credit Losses Individually Evaluated For Purchased Credit Impairment FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForPurchasedCreditImpairment	725000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	21133000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	24029000	USD
CY2021Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	15025000	USD
CY2021Q4	fgbi	Financing Receivable Individually Evaluated For Purchased Credit Impairment FinancingReceivableIndividuallyEvaluatedForPurchasedCreditImpairment	5143000	USD
CY2021Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	2145880000	USD
CY2021Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	2166048000	USD
CY2021Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	6689000	USD
CY2021Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	2159359000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	2643000	USD
CY2020Q4	fgbi	Financing Receivable Allowance For Credit Losses Individually Evaluated For Purchased Credit Impairment FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForPurchasedCreditImpairment	476000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	21399000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	24518000	USD
CY2020Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	15898000	USD
CY2020Q4	fgbi	Financing Receivable Individually Evaluated For Purchased Credit Impairment FinancingReceivableIndividuallyEvaluatedForPurchasedCreditImpairment	9155000	USD
CY2020Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1824119000	USD
CY2020Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1849172000	USD
CY2020Q4	us-gaap	Financing Receivable Deferred Income FinancingReceivableDeferredIncome	5037000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	1844135000	USD
CY2021Q4	fgbi	Financing Receivable Recorded Investment Not Accruing Interest FinancingReceivableRecordedInvestmentNotAccruingInterest	16700000	USD
CY2020Q4	fgbi	Financing Receivable Recorded Investment Not Accruing Interest FinancingReceivableRecordedInvestmentNotAccruingInterest	15600000	USD
CY2019Q4	fgbi	Financing Receivable Recorded Investment Not Accruing Interest FinancingReceivableRecordedInvestmentNotAccruingInterest	14400000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	1200000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	13100000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	2600000	USD
CY2021Q4	fgbi	Financing Receivable Average Recorded Investment Nonaccrual Status FinancingReceivableAverageRecordedInvestmentNonaccrualStatus	17100000	USD
CY2020Q4	fgbi	Financing Receivable Average Recorded Investment Nonaccrual Status FinancingReceivableAverageRecordedInvestmentNonaccrualStatus	19800000	USD
CY2019Q4	fgbi	Financing Receivable Average Recorded Investment Nonaccrual Status FinancingReceivableAverageRecordedInvestmentNonaccrualStatus	12000000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	7017000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	7956000	USD
CY2021	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	7826000	USD
CY2021	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	167000	USD
CY2021	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisMethod	134000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	8008000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	8399000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2171000	USD
CY2021	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	8200000	USD
CY2021	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	174000	USD
CY2021	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeCashBasisMethod	209000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	15025000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	16355000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2171000	USD
CY2021	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	16026000	USD
CY2021	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	341000	USD
CY2021	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	343000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	5413000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	5575000	USD
CY2020	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	5703000	USD
CY2020	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	128000	USD
CY2020	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisMethod	119000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	10485000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	10531000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2643000	USD
CY2020	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	9500000	USD
CY2020	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	144000	USD
CY2020	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeCashBasisMethod	142000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	15898000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	16106000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2643000	USD
CY2020	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	15203000	USD
CY2020	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	272000	USD
CY2020	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	261000	USD
CY2020Q4	fgbi	Financing Receivable Troubled Debt Restructuring Number Of Contracts FinancingReceivableTroubledDebtRestructuringNumberOfContracts	1	loan
CY2021Q4	fgbi	Financing Receivable Troubled Debt Restructuring Number Of Contracts FinancingReceivableTroubledDebtRestructuringNumberOfContracts	1	loan
CY2021Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	3382000	USD
CY2020Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	3591000	USD
CY2020Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	3591000	USD
CY2021	fgbi	Financing Receivable Modifications Additions FinancingReceivableModificationsAdditions	0	USD
CY2021	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	0	USD
CY2021	fgbi	Financing Receivable Modifications Transferred To Other Real Estate FinancingReceivableModificationsTransferredToOtherRealEstate	0	USD
CY2021	fgbi	Financing Receivable Modifications Paydowns FinancingReceivableModificationsPaydowns	250000	USD
CY2021	fgbi	Financing Receivable Modifications Construction To Permanent Financing FinancingReceivableModificationsConstructionToPermanentFinancing	0	USD
CY2021	fgbi	Financing Receivable Modifications Restructured To Market Terms FinancingReceivableModificationsRestructuredToMarketTerms	0	USD
CY2021	fgbi	Financing Receivable Modifications Other Adjustments FinancingReceivableModificationsOtherAdjustments	41000	USD
CY2021Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	3382000	USD
CY2020Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	55000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	100200000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	98159000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	41563000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	38267000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	58637000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	59892000	USD
CY2021	us-gaap	Depreciation Depreciation	3400000	USD
CY2020	us-gaap	Depreciation Depreciation	2800000	USD
CY2019	us-gaap	Depreciation Depreciation	2300000	USD
CY2021Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	61000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	12900000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	12900000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	18399000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	12477000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	5922000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	18092000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	11505000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	6587000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	800000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	700000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	400000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	696000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	696000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	696000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	696000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Rolling After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseRollingAfterYearFive	696000	USD
CY2021Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	2593000	USD
CY2020Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	2645000	USD
CY2021Q4	fgbi	Other Real Estate Foreclosed Assets And Repossessed Assets Allowance For Credit Loss OtherRealEstateForeclosedAssetsAndRepossessedAssetsAllowanceForCreditLoss	521000	USD
CY2020Q4	fgbi	Other Real Estate Foreclosed Assets And Repossessed Assets Allowance For Credit Loss OtherRealEstateForeclosedAssetsAndRepossessedAssetsAllowanceForCreditLoss	405000	USD
CY2021Q4	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	2072000	USD
CY2020Q4	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	2240000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	267016000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	152920000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	116771000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	19482000	USD
CY2021Q4	fgbi	Time Deposit Maturities After Year Four TimeDepositMaturitiesAfterYearFour	30482000	USD
CY2021Q4	us-gaap	Time Deposits TimeDeposits	586671000	USD
CY2021Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	3400000	USD
CY2021Q4	fgbi	Time Deposits250000 Or More TimeDeposits250000OrMore	159100000	USD
CY2020Q4	fgbi	Time Deposits250000 Or More TimeDeposits250000OrMore	248800000	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	0	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	50000000	USD
CY2021Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	6439000	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	6121000	USD
CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	6439000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	56121000	USD
CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	6400000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	56100000	USD
CY2021Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	26500000	USD
CY2021Q4	us-gaap	Lines Of Credit Current LinesOfCreditCurrent	0	USD
CY2021Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	597600000	USD
CY2020Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	297200000	USD
CY2021Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	6439000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	56121000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	19919000	USD
CY2021	us-gaap	Shortterm Debt Maximum Monthend Outstanding Amount ShorttermDebtMaximumMonthendOutstandingAmount	56369000	USD
CY2020	us-gaap	Shortterm Debt Maximum Monthend Outstanding Amount ShorttermDebtMaximumMonthendOutstandingAmount	57048000	USD
CY2019	us-gaap	Shortterm Debt Maximum Monthend Outstanding Amount ShorttermDebtMaximumMonthendOutstandingAmount	19919000	USD
CY2021	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	10458000	USD
CY2020	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	48277000	USD
CY2019	us-gaap	Shortterm Debt Average Outstanding Amount ShorttermDebtAverageOutstandingAmount	3320000	USD
CY2021	us-gaap	Short Term Debt Weighted Average Interest Rate Over Time ShortTermDebtWeightedAverageInterestRateOverTime	0.0140
CY2020	us-gaap	Short Term Debt Weighted Average Interest Rate Over Time ShortTermDebtWeightedAverageInterestRateOverTime	0.0095
CY2019	us-gaap	Short Term Debt Weighted Average Interest Rate Over Time ShortTermDebtWeightedAverageInterestRateOverTime	0.0200
CY2021Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0223
CY2020Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0089
CY2019Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.0200
CY2021Q4	fgbi	Number Of Credit Facilities NumberOfCreditFacilities	2	facility
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	43200000	USD
CY2021Q4	us-gaap	Banking Regulation Capital Conservation Buffer Capital Conserved Minimum BankingRegulationCapitalConservationBufferCapitalConservedMinimum	0.025
CY2021Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	10000000000	USD
CY2021Q1	fgbi	Banking Regulation Community Bank Leverage Ratio BankingRegulationCommunityBankLeverageRatio	0.09
CY2020Q2	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.08
CY2021	fgbi	Banking Regulation Increase Community Bank Leverage Ratio BankingRegulationIncreaseCommunityBankLeverageRatio	0.085
CY2021	fgbi	Banking Regulation Community Bank Leverage Ratio BankingRegulationCommunityBankLeverageRatio	0.09
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
CY2021	fgbi	Percentage Of Outstanding Capital Stock Maximum PercentageOfOutstandingCapitalStockMaximum	0.50
CY2021	us-gaap	Undistributed Earnings UndistributedEarnings	8700000	USD
CY2020Q4	us-gaap	Notes Receivable Related Parties NotesReceivableRelatedParties	79399000	USD
CY2019Q4	us-gaap	Notes Receivable Related Parties NotesReceivableRelatedParties	61820000	USD
CY2021	us-gaap	Increase Decrease In Notes Receivable Related Parties IncreaseDecreaseInNotesReceivableRelatedParties	13871000	USD
CY2020	us-gaap	Increase Decrease In Notes Receivable Related Parties IncreaseDecreaseInNotesReceivableRelatedParties	17579000	USD
CY2021Q4	us-gaap	Notes Receivable Related Parties NotesReceivableRelatedParties	93270000	USD
CY2020Q4	us-gaap	Notes Receivable Related Parties NotesReceivableRelatedParties	79399000	USD
CY2021	fgbi	Defined Contribution Plan Minimum Annual Contributions Per Employee Percent DefinedContributionPlanMinimumAnnualContributionsPerEmployeePercent	0.01
CY2021	fgbi	Defined Contribution Plan Maximum Matching Percentage DefinedContributionPlanMaximumMatchingPercentage	1
CY2021	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	396000	USD
CY2020	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	173000	USD
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	149000	USD
CY2021	us-gaap	Employee Stock Ownership Plan Esop Cash Contributions To Esop EmployeeStockOwnershipPlanESOPCashContributionsToESOP	0	USD
CY2019	us-gaap	Employee Stock Ownership Plan Esop Cash Contributions To Esop EmployeeStockOwnershipPlanESOPCashContributionsToESOP	0	USD
CY2020	us-gaap	Employee Stock Ownership Plan Esop Cash Contributions To Esop EmployeeStockOwnershipPlanESOPCashContributionsToESOP	0	USD
CY2021Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	3047	shares
CY2021	us-gaap	Legal Fees LegalFees	3375000	USD
CY2020	us-gaap	Legal Fees LegalFees	2919000	USD
CY2019	us-gaap	Legal Fees LegalFees	2648000	USD
CY2021	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	1794000	USD
CY2020	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	2465000	USD
CY2019	fgbi	Automated Teller Machine Fees AutomatedTellerMachineFees	1217000	USD
CY2019	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	1972000	USD
CY2021	fgbi	Automated Teller Machine Fees AutomatedTellerMachineFees	1760000	USD
CY2020	fgbi	Automated Teller Machine Fees AutomatedTellerMachineFees	1332000	USD
CY2021	us-gaap	Marketing Expense MarketingExpense	1711000	USD
CY2020	us-gaap	Marketing Expense MarketingExpense	1046000	USD
CY2019	us-gaap	Marketing Expense MarketingExpense	1456000	USD
CY2021	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	1755000	USD
CY2020	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	1251000	USD
CY2019	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	1094000	USD
CY2021	us-gaap	Supplies Expense SuppliesExpense	853000	USD
CY2020	us-gaap	Supplies Expense SuppliesExpense	921000	USD
CY2019	us-gaap	Supplies Expense SuppliesExpense	674000	USD
CY2021	fgbi	Software Expense And Amortization SoftwareExpenseAndAmortization	3071000	USD
CY2020	fgbi	Software Expense And Amortization SoftwareExpenseAndAmortization	2354000	USD
CY2019	fgbi	Software Expense And Amortization SoftwareExpenseAndAmortization	1308000	USD
CY2019	fgbi	Telephone Expense TelephoneExpense	193000	USD
CY2021	fgbi	Amortization Of Core Deposits AmortizationOfCoreDeposits	764000	USD
CY2021	us-gaap	Travel And Entertainment Expense TravelAndEntertainmentExpense	826000	USD
CY2020	us-gaap	Travel And Entertainment Expense TravelAndEntertainmentExpense	726000	USD
CY2019	us-gaap	Travel And Entertainment Expense TravelAndEntertainmentExpense	908000	USD
CY2021	fgbi	Telephone Expense TelephoneExpense	398000	USD
CY2020	fgbi	Telephone Expense TelephoneExpense	256000	USD
CY2020	fgbi	Amortization Of Core Deposits AmortizationOfCoreDeposits	712000	USD
CY2019	fgbi	Amortization Of Core Deposits AmortizationOfCoreDeposits	390000	USD
CY2021	fgbi	Donations Donations	564000	USD
CY2020	fgbi	Donations Donations	393000	USD
CY2019	fgbi	Donations Donations	603000	USD
CY2021	fgbi	Net Costs From Other Real Estate And Repossessions NetCostsFromOtherRealEstateAndRepossessions	801000	USD
CY2020	fgbi	Net Costs From Other Real Estate And Repossessions NetCostsFromOtherRealEstateAndRepossessions	1653000	USD
CY2019	fgbi	Net Costs From Other Real Estate And Repossessions NetCostsFromOtherRealEstateAndRepossessions	422000	USD
CY2021	fgbi	Regulatory Assessment RegulatoryAssessment	1945000	USD
CY2020	fgbi	Regulatory Assessment RegulatoryAssessment	1716000	USD
CY2019	fgbi	Regulatory Assessment RegulatoryAssessment	683000	USD
CY2021	fgbi	Non Interest Expense Other NonInterestExpenseOther	3391000	USD
CY2020	fgbi	Non Interest Expense Other NonInterestExpenseOther	2980000	USD
CY2019	fgbi	Non Interest Expense Other NonInterestExpenseOther	2536000	USD
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	23008000	USD
CY2020	us-gaap	Other Noninterest Expense OtherNoninterestExpense	20724000	USD
CY2019	us-gaap	Other Noninterest Expense OtherNoninterestExpense	16104000	USD
CY2021	us-gaap	Advertising Expense AdvertisingExpense	1000000	USD
CY2020	us-gaap	Advertising Expense AdvertisingExpense	400000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	800000	USD
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	7970000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	8964000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3770000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-812000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3745000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-114000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7158000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5219000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3656000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	7236000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	5363000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	3758000	USD
CY2021	fgbi	Income Tax Reconciliation Tax Exempt Income Municipal Income IncomeTaxReconciliationTaxExemptIncomeMunicipalIncome	81000	USD
CY2020	fgbi	Income Tax Reconciliation Tax Exempt Income Municipal Income IncomeTaxReconciliationTaxExemptIncomeMunicipalIncome	124000	USD
CY2019	fgbi	Income Tax Reconciliation Tax Exempt Income Municipal Income IncomeTaxReconciliationTaxExemptIncomeMunicipalIncome	140000	USD
CY2021	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	3000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-20000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	38000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7158000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5219000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3656000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	4817000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	4748000	USD
CY2021Q4	fgbi	Deferred Tax Assets Other Real Estate Owned DeferredTaxAssetsOtherRealEstateOwned	219000	USD
CY2020Q4	fgbi	Deferred Tax Assets Other Real Estate Owned DeferredTaxAssetsOtherRealEstateOwned	239000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	331000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	0	USD
CY2021Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1098000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1190000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	781000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	581000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	7246000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	6758000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1917000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1952000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	1059000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	1214000	USD
CY2021Q4	fgbi	Deferred Tax Liabilities Unrealized Gains On Availablefor Sale Securities DeferredTaxLiabilitiesUnrealizedGainsOnAvailableforSaleSecurities	0	USD
CY2020Q4	fgbi	Deferred Tax Liabilities Unrealized Gains On Availablefor Sale Securities DeferredTaxLiabilitiesUnrealizedGainsOnAvailableforSaleSecurities	172000	USD
CY2021Q4	fgbi	Deferred Tax Liabilities Discount On Purchased Loans DeferredTaxLiabilitiesDiscountOnPurchasedLoans	164000	USD
CY2020Q4	fgbi	Deferred Tax Liabilities Discount On Purchased Loans DeferredTaxLiabilitiesDiscountOnPurchasedLoans	161000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	687000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	625000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	0	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	3827000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	4124000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	3419000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	2634000	USD
CY2021Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	5200000	USD
CY2020Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	5700000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2021	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense	0	USD
CY2020Q4	us-gaap	Income Tax Examination Penalties Accrued IncomeTaxExaminationPenaltiesAccrued	0	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2019Q4	us-gaap	Income Tax Examination Penalties Accrued IncomeTaxExaminationPenaltiesAccrued	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2021Q4	us-gaap	Income Tax Examination Penalties Accrued IncomeTaxExaminationPenaltiesAccrued	0	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2021	fgbi	Extension Period Of Majority Of Short Term Borrowing ExtensionPeriodOfMajorityOfShortTermBorrowing	P1Y
CY2021	fgbi	Maximum Extension Period Of Short Term Borrowing MaximumExtensionPeriodOfShortTermBorrowing	P3Y
CY2020	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	0	USD
CY2019	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	0	USD
CY2021	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	0	USD
CY2020Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	26189000	USD
CY2019Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	9398000	USD
CY2021	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	0	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	0	USD
CY2021	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	-195000	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	256000	USD
CY2021	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases Sales Issuances Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements	-8845000	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchases Sales Issuances Settlements FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements	5361000	USD
CY2021	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	-4844000	USD
CY2020	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet	11174000	USD
CY2021Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	12305000	USD
CY2020Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	26189000	USD
CY2021Q4	fgbi	Percentage Of Entity Deposits PercentageOfEntityDeposits	0.369
CY2021	fgbi	Number Of Deposits Of Depositing Authorities NumberOfDepositsOfDepositingAuthorities	1	deposit
CY2021Q4	fgbi	Public Fund Deposits PublicFundDeposits	957900000	USD
CY2021	dei	Auditor Firm AuditorFirmId	447

Files In Submission

Name	View Source	Status
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$FGBI
First Guaranty Bancshares, Inc. Stock $fgbi

2021 Q4 Form 10-K Financial Statement

#000140853422000022 Filed on March 16, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FGBI First Guaranty Bancshares, Inc. Stock $fgbi

2021 Q4 Form 10-K Financial Statement

#000140853422000022 Filed on March 16, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FGBI
First Guaranty Bancshares, Inc. Stock $fgbi