$FBK
FB Financial Corp Stock $fbk

$fbk Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-Q Financial Statement

#000164974921000180 Filed on November 08, 2021

Income Statement

Concept	2021 Q4	2021 Q3	2020 Q3
Revenue		$96.67M	$81.13M
YoY Change		19.15%	10.77%
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	$3.400M	$3.600M	$3.100M
YoY Change	-17.07%	16.13%	24.0%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense		$8.189M	$12.30M
YoY Change		-33.42%	-17.66%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$62.80M	$55.01M	-$7.639M
YoY Change	6.62%	-820.07%	-124.11%
Income Tax	$14.00M	$9.716M	-$2.040M
% Of Pretax Income	22.29%	17.66%
Net Earnings	$48.80M	$45.29M	-$5.599M
YoY Change	7.01%	-908.89%	-123.36%
Net Earnings / Revenue		46.85%	-6.9%
Basic Earnings Per Share		$0.96	-$0.14
Diluted Earnings Per Share	$1.019M	$0.94	-$0.14
COMMON SHARES
Basic Shares Outstanding	47.71M shares	47.41M shares	40.15M shares
Diluted Shares Outstanding		48.01M shares	40.64M shares

Balance Sheet

Concept	2021 Q4	2021 Q3	2020 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$1.798B	$1.325B	$1.062B
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$185.0M	$189.0M	$136.8M
YoY Change	-5.13%	38.18%	48.97%
Goodwill	$242.6M	$242.6M	$236.1M
YoY Change	0.0%	2.74%	40.12%
Intangibles
YoY Change
Long-Term Investments	$3.000M	$5.000M	$4.000M
YoY Change	-40.0%	25.0%	33.33%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$12.60B	$11.81B	$11.01B
YoY Change	12.41%	7.26%	80.83%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$156.0M	$165.0M	$233.0M
YoY Change	-29.09%	-29.18%	102.61%
Deferred Revenue
YoY Change
Short-Term Debt	$41.00M	$42.00M
YoY Change	28.13%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$156.0M	$165.0M	$233.0M
YoY Change	-29.09%	-29.18%	102.61%
LONG-TERM LIABILITIES
Long-Term Debt	$131.0M	$131.0M	$239.0M
YoY Change	-36.41%	-45.19%	-22.15%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$131.0M	$131.0M	$239.0M
YoY Change	-36.41%	-45.19%	-22.15%
TOTAL LIABILITIES
Total Short-Term Liabilities	$156.0M	$165.0M	$233.0M
Total Long-Term Liabilities	$131.0M	$131.0M	$239.0M
Total Liabilities	$11.16B	$10.41B	$9.765B
YoY Change	12.6%	6.59%	82.73%
SHAREHOLDERS EQUITY
Retained Earnings	$486.7M	$443.1M	$276.4M
YoY Change	53.22%	60.35%	0.68%
Common Stock	$940.1M	$945.1M	$943.4M
YoY Change	-0.63%	0.19%	106.09%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.433B	$1.401B	$1.245B
YoY Change
Total Liabilities & Shareholders Equity	$12.60B	$11.81B	$11.01B
YoY Change	12.41%	7.26%	80.83%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2020 Q3
OPERATING ACTIVITIES
Net Income	$48.80M	$45.29M	-$5.599M
YoY Change	7.01%	-908.89%	-123.36%
Depreciation, Depletion And Amortization	$3.400M	$3.600M	$3.100M
YoY Change	-17.07%	16.13%	24.0%
Cash From Operating Activities	$95.90M	$34.10M	$5.700M
YoY Change	-174.92%	498.25%	-283.87%
INVESTING ACTIVITIES
Capital Expenditures	-$900.0K	-$4.000M	$2.100M
YoY Change	-71.88%	-290.48%	-167.74%
Acquisitions
YoY Change
Other Investing Activities	-$373.4M	-$265.6M	$259.0M
YoY Change	-254.11%	-202.55%	-731.71%
Cash From Investing Activities	-$374.3M	-$269.6M	$261.2M
YoY Change	-256.68%	-203.22%	-693.64%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	751.5M	-157.0M	77.90M
YoY Change	420.07%	-301.54%	-37.98%
NET CHANGE
Cash From Operating Activities	95.90M	34.10M	5.700M
Cash From Investing Activities	-374.3M	-269.6M	261.2M
Cash From Financing Activities	751.5M	-157.0M	77.90M
Net Change In Cash	473.1M	-392.5M	344.8M
YoY Change	85.24%	-213.83%	339.24%
FREE CASH FLOW
Cash From Operating Activities	$95.90M	$34.10M	$5.700M
Capital Expenditures	-$900.0K	-$4.000M	$2.100M
Free Cash Flow	$96.80M	$38.10M	$3.600M
YoY Change	-177.56%	958.33%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Entity Central Index Key EntityCentralIndexKey	0001649749
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
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CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
CY2021Q3	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#DebtLongtermAndShorttermCombinedAmount
CY2020Q4	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#DebtLongtermAndShorttermCombinedAmount
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2021-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-37875
	dei	Entity Registrant Name EntityRegistrantName	FB FINANCIAL CORPORATION
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	TN
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	TN
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	62-1216058
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	62-1216058
	dei	Entity Address Address Line1 EntityAddressAddressLine1	211 Commerce Street
	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 300
	dei	Entity Address City Or Town EntityAddressCityOrTown	Nashville
	dei	Entity Address State Or Province EntityAddressStateOrProvince	TN
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	37201
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	37201
	dei	City Area Code CityAreaCode	615
	dei	Local Phone Number LocalPhoneNumber	564-1212
	dei	Security12b Title Security12bTitle	Common Stock, Par Value $1.00 Per Share
	dei	Trading Symbol TradingSymbol	FBK
	dei	Security Exchange Name SecurityExchangeName	NYSE
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	true
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	true
	dei	Entity Ex Transition Period EntityExTransitionPeriod	true
	dei	Entity Shell Company EntityShellCompany	false
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	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-156000	USD
CY2021Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1398000	USD
CY2020Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	5133000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	6578000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	10395000	USD
CY2021Q3	us-gaap	Noninterest Income NoninterestIncome	59006000	USD
CY2020Q3	us-gaap	Noninterest Income NoninterestIncome	97026000	USD
	us-gaap	Noninterest Income NoninterestIncome	175036000	USD
	us-gaap	Noninterest Income NoninterestIncome	221217000	USD
CY2021Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	62818000	USD
CY2020Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	67676000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	189756000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	166556000	USD
CY2021Q3	us-gaap	Occupancy Net OccupancyNet	5979000	USD
CY2020Q3	us-gaap	Occupancy Net OccupancyNet	4892000	USD
	us-gaap	Occupancy Net OccupancyNet	17184000	USD
	us-gaap	Occupancy Net OccupancyNet	13166000	USD
CY2021Q3	fbk	Legal And Professional Fees LegalAndProfessionalFees	2177000	USD
CY2020Q3	fbk	Legal And Professional Fees LegalAndProfessionalFees	1917000	USD
	fbk	Legal And Professional Fees LegalAndProfessionalFees	6701000	USD
	fbk	Legal And Professional Fees LegalAndProfessionalFees	5427000	USD
CY2021Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	2595000	USD
CY2020Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	2994000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	7456000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	8229000	USD
CY2021Q3	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	0	USD
CY2020Q3	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	20730000	USD
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	0	USD
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	25366000	USD
CY2021Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1344000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1417000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	4178000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3825000	USD
CY2021Q3	us-gaap	Advertising Expense AdvertisingExpense	4200000	USD
CY2020Q3	us-gaap	Advertising Expense AdvertisingExpense	2256000	USD
	us-gaap	Advertising Expense AdvertisingExpense	10012000	USD
	us-gaap	Advertising Expense AdvertisingExpense	7236000	USD
CY2021Q3	fbk	Noninterest Expense Other NoninterestExpenseOther	15894000	USD
CY2020Q3	fbk	Noninterest Expense Other NoninterestExpenseOther	16210000	USD
	fbk	Noninterest Expense Other NoninterestExpenseOther	47378000	USD
	fbk	Noninterest Expense Other NoninterestExpenseOther	37425000	USD
CY2021Q3	us-gaap	Noninterest Expense NoninterestExpense	95007000	USD
CY2020Q3	us-gaap	Noninterest Expense NoninterestExpense	118092000	USD
	us-gaap	Noninterest Expense NoninterestExpense	282665000	USD
	us-gaap	Noninterest Expense NoninterestExpense	267230000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	55006000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-7639000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	180210000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	23514000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9716000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2040000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38744000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5495000	USD
CY2021Q3	us-gaap	Profit Loss ProfitLoss	45290000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	-5599000	USD
	us-gaap	Profit Loss ProfitLoss	141466000	USD
	us-gaap	Profit Loss ProfitLoss	18019000	USD
CY2021Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2020Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	8000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	45290000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-5599000	USD
	us-gaap	Net Income Loss NetIncomeLoss	141458000	USD
	us-gaap	Net Income Loss NetIncomeLoss	18019000	USD
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.96
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.14
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.99
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.94
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.14
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.95
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2021Q3	us-gaap	Profit Loss ProfitLoss	45290000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	-5599000	USD
	us-gaap	Profit Loss ProfitLoss	141466000	USD
	us-gaap	Profit Loss ProfitLoss	18019000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-2054000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	521000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-4708000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	5225000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-5818000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1788000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-15380000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	15091000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	19000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	137000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	23000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	137000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	56000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	387000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	67000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	387000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	38000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	40000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	173000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-403000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	106000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	112000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	489000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-1145000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	41000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	145000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	115000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	0	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	410000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-5768000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1398000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-14958000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	13149000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	39522000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-4201000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	126508000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	31168000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	8000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	39522000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-4201000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	126500000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	31168000	USD
CY2021Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1371814000	USD
CY2021Q3	us-gaap	Profit Loss ProfitLoss	45290000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-5768000	USD
CY2021Q3	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	436000	USD
CY2021Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2884000	USD
CY2021Q3	us-gaap	Restricted Stock Value Shares Issued Net Of Tax Withholdings RestrictedStockValueSharesIssuedNetOfTaxWithholdings	8102000	USD
CY2021Q3	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	647000	USD
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.11
CY2021Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	5323000	USD
CY2021Q3	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	0	USD
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1401006000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1291382000	USD
	us-gaap	Profit Loss ProfitLoss	141466000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-14958000	USD
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	436000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8065000	USD
	us-gaap	Restricted Stock Value Shares Issued Net Of Tax Withholdings RestrictedStockValueSharesIssuedNetOfTaxWithholdings	10042000	USD
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1480000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.33
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	15943000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	8000	USD
CY2021Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1401006000	USD
CY2020Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	805216000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	-5599000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1398000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	444966000	USD
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3020000	USD
CY2020Q3	us-gaap	Restricted Stock Value Shares Issued Net Of Tax Withholdings RestrictedStockValueSharesIssuedNetOfTaxWithholdings	106000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	532000	USD
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.09
CY2020Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4336000	USD
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1245091000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	762329000	USD
	us-gaap	Profit Loss ProfitLoss	18019000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	13149000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	7253000	USD
	us-gaap	Restricted Stock Value Shares Issued Net Of Tax Withholdings RestrictedStockValueSharesIssuedNetOfTaxWithholdings	1268000	USD
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	978000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.27
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	10164000	USD
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1245091000	USD
	us-gaap	Profit Loss ProfitLoss	141466000	USD
	us-gaap	Profit Loss ProfitLoss	18019000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	6288000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	4924000	USD
	fbk	Amortization Of Other Intangible Assets AmortizationOfOtherIntangibleAssets	4178000	USD
	fbk	Amortization Of Other Intangible Assets AmortizationOfOtherIntangibleAssets	3825000	USD
	fbk	Capitalization Of Mortgage Servicing Rights Ms Rs CapitalizationOfMortgageServicingRightsMSRs	31382000	USD
	fbk	Capitalization Of Mortgage Servicing Rights Ms Rs CapitalizationOfMortgageServicingRightsMSRs	33415000	USD
	fbk	Change In Fair Value Of Mortgage Servicing Rights ChangeInFairValueOfMortgageServicingRights	788000	USD
	fbk	Change In Fair Value Of Mortgage Servicing Rights ChangeInFairValueOfMortgageServicingRights	42251000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	8065000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	7253000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-27349000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	97837000	USD
	fbk	Unfunded Commitments Credit Loss Expense Reversal UnfundedCommitmentsCreditLossExpenseReversal	-2875000	USD
	fbk	Unfunded Commitments Credit Loss Expense Reversal UnfundedCommitmentsCreditLossExpenseReversal	13050000	USD
	fbk	Provision For Mortgage Loan Repurchases Or Indemnifications ProvisionForMortgageLoanRepurchasesOrIndemnifications	-266000	USD
	fbk	Provision For Mortgage Loan Repurchases Or Indemnifications ProvisionForMortgageLoanRepurchasesOrIndemnifications	2128000	USD
	fbk	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion Amortization CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretionAmortization	-127000	USD
	fbk	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion Amortization CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretionAmortization	3080000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-6521000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-4431000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	278000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	618000	USD
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	4926390000	USD
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	4739497000	USD
	us-gaap	Payments To Purchase Loans Held For Sale PaymentsToPurchaseLoansHeldForSale	384000	USD
	us-gaap	Payments To Purchase Loans Held For Sale PaymentsToPurchaseLoansHeldForSale	0	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	4939323000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	4690135000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	126983000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	202336000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	2478000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-1368000	USD
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	162000	USD
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-156000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	20904000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-31543000	USD
	fbk	Increase Decrease In Operating Leases IncreaseDecreaseInOperatingLeases	-781000	USD
	fbk	Increase Decrease In Operating Leases IncreaseDecreaseInOperatingLeases	1309000	USD
	fbk	Increase Decrease In Other Assets And Interest Receivable IncreaseDecreaseInOtherAssetsAndInterestReceivable	-2508000	USD
CY2020	fbk	Noncash Or Part Noncash Trade Date Receivable NoncashOrPartNoncashTradeDateReceivable	0	USD
	fbk	Increase Decrease In Other Assets And Interest Receivable IncreaseDecreaseInOtherAssetsAndInterestReceivable	-77566000	USD
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	-46867000	USD
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	59420000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-41043000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-141949000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	8855000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	28257000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	216032000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	140246000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	645658000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	214285000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	61795000	USD
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	133893000	USD
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	4294000	USD
	us-gaap	Proceeds From Sale Of Federal Home Loan Bank Stock ProceedsFromSaleOfFederalHomeLoanBankStock	0	USD
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	663000	USD
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	515000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5193000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2652000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	8834000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	5561000	USD
	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	248439000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-475294000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	71158000	USD
	us-gaap	Increase Decrease In Demand Deposits IncreaseDecreaseInDemandDeposits	863646000	USD
	us-gaap	Increase Decrease In Demand Deposits IncreaseDecreaseInDemandDeposits	1043928000	USD
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-249765000	USD
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-201659000	USD
	fbk	Increase Decrease In Securities Sold Under Agreements To Repurchase IncreaseDecreaseInSecuritiesSoldUnderAgreementsToRepurchase	9531000	USD
	fbk	Increase Decrease In Securities Sold Under Agreements To Repurchase IncreaseDecreaseInSecuritiesSoldUnderAgreementsToRepurchase	5532000	USD
	us-gaap	Payments For Federal Home Loan Bank Advances PaymentsForFederalHomeLoanBankAdvances	0	USD
	us-gaap	Payments For Federal Home Loan Bank Advances PaymentsForFederalHomeLoanBankAdvances	50000000	USD
	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0	USD
	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	98190000	USD
	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	60000000	USD
	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	0	USD
	fbk	Accretion Of Debt Fair Value Premium And Amortization Of Debt Issuance Costs AccretionOfDebtFairValuePremiumAndAmortizationOfDebtIssuanceCosts	79000	USD
	fbk	Accretion Of Debt Fair Value Premium And Amortization Of Debt Issuance Costs AccretionOfDebtFairValuePremiumAndAmortizationOfDebtIssuanceCosts	175000	USD
	fbk	Proceeds From Payments For Other Borrowings ProceedsFromPaymentsForOtherBorrowings	-15000000	USD
	fbk	Proceeds From Payments For Other Borrowings ProceedsFromPaymentsForOtherBorrowings	15000000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	10042000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1268000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1480000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	978000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	436000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	16324000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	10025000	USD
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	8000	USD
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
	fbk	Noncash Or Part Noncash Trade Date Receivable NoncashOrPartNoncashTradeDateReceivable	0	USD
	fbk	Noncash Or Part Noncash Trade Date Payable NoncashOrPartNoncashTradeDatePayable	5996000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	523003000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	900501000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	6666000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	829710000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1317898000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	232681000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1324564000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1062391000	USD
	us-gaap	Interest Paid Net InterestPaidNet	34542000	USD
	us-gaap	Interest Paid Net InterestPaidNet	36498000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	55609000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	16449000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	4945000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1579000	USD
	fbk	Other Real Estate Owned Transfer To Other Real Estate Owned OtherRealEstateOwnedTransferToOtherRealEstateOwned	0	USD
	fbk	Other Real Estate Owned Transfer To Other Real Estate Owned OtherRealEstateOwnedTransferToOtherRealEstateOwned	841000	USD
	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	685000	USD
	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	0	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	10408000	USD
	us-gaap	Transfer Of Portfolio Loans And Leases To Held For Sale1 TransferOfPortfolioLoansAndLeasesToHeldForSale1	9304000	USD
	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	52151000	USD
	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	49508000	USD
	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	0	USD
	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	480867000	USD
	fbk	Noncash Or Part Noncash Trade Date Payable NoncashOrPartNoncashTradeDatePayable	5996000	USD
	fbk	Noncash Or Part Noncash Trade Date Payable NoncashOrPartNoncashTradeDatePayable	1214000	USD
CY2021Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	340000	USD
CY2020Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	139000	USD
	fbk	Non Cash Transaction Due To Adoption Of Recognition And Measurement Of Financial Assets And Liabilities NonCashTransactionDueToAdoptionOfRecognitionAndMeasurementOfFinancialAssetsAndLiabilities	0	USD
	fbk	Non Cash Transaction Due To Adoption Of Recognition And Measurement Of Financial Assets And Liabilities NonCashTransactionDueToAdoptionOfRecognitionAndMeasurementOfFinancialAssetsAndLiabilities	25018000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	839000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	806000	USD
CY2021Q3	fbk	Number Of Full Service Branches NumberOfFullServiceBranches	82	branch
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	Certain prior period amounts have been reclassified to conform to the current period presentation without any impact on the reported amounts of net income or shareholders’ equity.
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	45290000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-5599000	USD
	us-gaap	Net Income Loss NetIncomeLoss	141458000	USD
	us-gaap	Net Income Loss NetIncomeLoss	18019000	USD
CY2021Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0	USD
CY2020Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0	USD
CY2021Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	45290000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-5599000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	141458000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	18019000	USD
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47412214	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40154841	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47345984	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	34404064	shares
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.96
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.14
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.99
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2021Q3	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Diluted NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted	45290000	USD
CY2020Q3	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Diluted NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted	-5599000	USD
	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Diluted NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted	141458000	USD
	us-gaap	Net Income Loss From Continuing Operations Available To Common Shareholders Diluted NetIncomeLossFromContinuingOperationsAvailableToCommonShareholdersDiluted	18019000	USD
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47412214	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40154841	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47345984	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	34404064	shares
CY2021Q3	us-gaap	Weighted Average Number Of Shares Contingently Issuable WeightedAverageNumberOfSharesContingentlyIssuable	594933	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Contingently Issuable WeightedAverageNumberOfSharesContingentlyIssuable	482904	shares
	us-gaap	Weighted Average Number Of Shares Contingently Issuable WeightedAverageNumberOfSharesContingentlyIssuable	637510	shares
	us-gaap	Weighted Average Number Of Shares Contingently Issuable WeightedAverageNumberOfSharesContingentlyIssuable	436228	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48007147	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	40637745	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	47983494	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	34840292	shares
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.94
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.14
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.95
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2020	fbk	Noncash Or Part Noncash Trade Date Payable NoncashOrPartNoncashTradeDatePayable	0	USD
CY2020Q3	fbk	Business Combination Consideration Transferred Shares Outstanding BusinessCombinationConsiderationTransferredSharesOutstanding	15651243	shares
CY2020Q3	fbk	Financing Receivable Deterioration Credit Quality Since Origination FinancingReceivableDeteriorationCreditQualitySinceOrigination	0.279
CY2020Q1	fbk	Financing Receivable Deterioration Credit Quality Since Origination FinancingReceivableDeteriorationCreditQualitySinceOrigination	0.101
CY2020Q3	fbk	Business Acquisition Pro Forma Interest Income Net BusinessAcquisitionProFormaInterestIncomeNet	83641000	USD
CY2020Q3	fbk	Business Acquisition Pro Forma Interest Income Net BusinessAcquisitionProFormaInterestIncomeNet	83641000	USD
	fbk	Business Acquisition Pro Forma Interest Income Net BusinessAcquisitionProFormaInterestIncomeNet	252849000	USD
CY2020Q3	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	178384000	USD
CY2020Q3	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	178384000	USD
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	488493000	USD
CY2020Q3	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	-12428000	USD
CY2020Q3	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	-12428000	USD
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	19526000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	1558184000	USD
CY2021Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	24408000	USD
CY2021Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	10034000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	1572558000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	1137848000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	35376000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	824000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	1172400000	USD
CY2021Q3	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	4779000	USD
CY2020Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	4591000	USD
CY2021Q3	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	34915000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	16713000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	16773000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	35486000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	35662000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	20242000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	20637000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	24278000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	24684000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	40757000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	42211000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	40038000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	41332000	USD
CY2020Q4	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	38316000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	254056000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	266722000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	257721000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	275798000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	331768000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	346343000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	357523000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	377476000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	1558184000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	1572558000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	1137848000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	1172400000	USD
CY2021Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	8855000	USD
CY2020Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	28257000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	8855000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	28257000	USD
CY2021Q3	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	68126000	USD
CY2020Q3	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	67886000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	216032000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	140246000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	76000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	563000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	91000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	563000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	1000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	39000	USD
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	1000	USD
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	39000	USD
CY2021Q3	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	-24000	USD
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	188000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	USD
CY2020Q3	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	59000	USD
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	94000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	752226000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	9761000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	24341000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	273000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	776567000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	10034000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	185695000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	824000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	0	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	0	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	185695000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	824000	USD
CY2021Q3	fbk	Number Of Available For Sale Securities In Portfolio NumberOfAvailableForSaleSecuritiesInPortfolio	513	security
CY2020Q4	fbk	Number Of Available For Sale Securities In Portfolio NumberOfAvailableForSaleSecuritiesInPortfolio	514	security
CY2021Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	61	security
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	16	security
CY2020Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	USD
CY2021Q3	fbk	Provision For Credit Losses On Available For Sale Debt Securities ProvisionForCreditLossesOnAvailableForSaleDebtSecurities	0	USD
CY2020Q3	fbk	Provision For Credit Losses On Available For Sale Debt Securities ProvisionForCreditLossesOnAvailableForSaleDebtSecurities	0	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	7294674000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	7082959000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	139446000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	170389000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	7155228000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	6912570000	USD
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	144663000	USD
CY2021Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-2832000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	229000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	2614000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	139446000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	170389000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-27349000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	1049000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	4643000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	139446000	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	113129000	USD
CY2020Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	45834000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	1172000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	993000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Loss Purchased With Credit Deterioration Increase FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	24831000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	183973000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	31139000	USD
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	97837000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2620000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	4569000	USD
	us-gaap	Financing Receivable Allowance For Credit Loss Purchased With Credit Deterioration Increase FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	25500000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	183973000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	1035000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	124183000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	139446000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	2039000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	149405000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	170389000	USD
CY2021Q3	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	28161000	USD
CY2021Q3	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	6754302000	USD
CY2021Q3	fbk	Financing Receivable Purchased With Credit Deterioration FinancingReceivablePurchasedWithCreditDeterioration	512211000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	7294674000	USD
CY2020Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	38205000	USD
CY2020Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	6329868000	USD
CY2020Q4	fbk	Financing Receivable Purchased With Credit Deterioration FinancingReceivablePurchasedWithCreditDeterioration	714886000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	7082959000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear	1652254000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear	1062475000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear	913233000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear	675880000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear	527364000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear	1225434000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Revolving FinancingReceivableExcludingAccruedInterestRevolving	1238034000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	7294674000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear	1517481000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear	1246239000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear	853371000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear	696494000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear	648821000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear	900082000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Revolving FinancingReceivableExcludingAccruedInterestRevolving	1220471000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	7082959000	USD
CY2021Q3	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	8901000	USD
CY2021Q3	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	34126000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	7294674000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	13696000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	50760000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	7082959000	USD
CY2021Q3	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	17919000	USD
CY2021Q3	fbk	Financing Receivable Nonaccrual Related Allowance FinancingReceivableNonaccrualRelatedAllowance	16207000	USD
CY2021Q3	fbk	Financing Receivable Allowance For Credit Losses Nonaccrual FinancingReceivableAllowanceForCreditLossesNonaccrual	1314000	USD
CY2020Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	32661000	USD
CY2020Q4	fbk	Financing Receivable Nonaccrual Related Allowance FinancingReceivableNonaccrualRelatedAllowance	18099000	USD
CY2020Q4	fbk	Financing Receivable Allowance For Credit Losses Nonaccrual FinancingReceivableAllowanceForCreditLossesNonaccrual	2550000	USD
CY2021Q3	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	961000	USD
CY2020Q3	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	524000	USD
	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	1973000	USD
	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	729000	USD
CY2021Q3	us-gaap	Financing Receivable Accrued Interest Writeoff FinancingReceivableAccruedInterestWriteoff	63000	USD
	us-gaap	Financing Receivable Accrued Interest Writeoff FinancingReceivableAccruedInterestWriteoff	177000	USD
CY2020Q3	us-gaap	Financing Receivable Accrued Interest Writeoff FinancingReceivableAccruedInterestWriteoff	660000	USD
	us-gaap	Financing Receivable Accrued Interest Writeoff FinancingReceivableAccruedInterestWriteoff	459000	USD
CY2021Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	29645000	USD
CY2020Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	15988000	USD
CY2021Q3	fbk	Financing Receivable Troubled Debt Restructuring Nonaccrual FinancingReceivableTroubledDebtRestructuringNonaccrual	10628000	USD
CY2021Q3	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	422000	USD
CY2021Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	1	loan
CY2020Q4	fbk	Financing Receivable Troubled Debt Restructuring Nonaccrual FinancingReceivableTroubledDebtRestructuringNonaccrual	8279000	USD
CY2021Q3	fbk	Financing Receivable Modifications Recorded Investment Specific Reserves FinancingReceivableModificationsRecordedInvestmentSpecificReserves	1007000	USD
CY2020Q4	fbk	Financing Receivable Modifications Recorded Investment Specific Reserves FinancingReceivableModificationsRecordedInvestmentSpecificReserves	310000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	0	USD
CY2021Q3	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	134000	USD
CY2021Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	134000	USD
CY2021Q3	fbk	Financing Receivable Modifications Charge Offs And Specific Reserves FinancingReceivableModificationsChargeOffsAndSpecificReserves	0	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	14	loan
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	29665000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	29665000	USD
	fbk	Financing Receivable Modifications Charge Offs And Specific Reserves FinancingReceivableModificationsChargeOffsAndSpecificReserves	0	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	2	loan
CY2020Q3	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	420000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	420000	USD
CY2020Q3	fbk	Financing Receivable Modifications Charge Offs And Specific Reserves FinancingReceivableModificationsChargeOffsAndSpecificReserves	0	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	8	loan
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	6190000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	6190000	USD
	fbk	Financing Receivable Modifications Charge Offs And Specific Reserves FinancingReceivableModificationsChargeOffsAndSpecificReserves	0	USD
CY2021Q3	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	305000	USD
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	305000	USD
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	USD
	fbk	Financing Receivable Classification Of Troubled Debt Restructures Exemption Period Caresact FinancingReceivableClassificationOfTroubledDebtRestructuresExemptionPeriodCARESACT	P60D
CY2021Q3	fbk	Deferred Loans That Were Transferred To Normal Payment Status Value Cares Act DeferredLoansThatWereTransferredToNormalPaymentStatusValueCARESAct	1331538000	USD
CY2020Q4	fbk	Deferred Loans That Were Transferred To Normal Payment Status Value Cares Act DeferredLoansThatWereTransferredToNormalPaymentStatusValueCARESAct	1399088000	USD
CY2021Q3	fbk	Financing Receivable Outstanding Loans Balance Caresact FinancingReceivableOutstandingLoansBalanceCARESACT	17953000	USD
CY2021Q3	fbk	Financing Receivable Percent Of Loans Held For Investment Caresact FinancingReceivablePercentOfLoansHeldForInvestmentCARESACT	0.002
CY2020Q4	fbk	Financing Receivable Outstanding Loans Balance Caresact FinancingReceivableOutstandingLoansBalanceCARESACT	202517000	USD
CY2020Q4	fbk	Financing Receivable Percent Of Loans Held For Investment Caresact FinancingReceivablePercentOfLoansHeldForInvestmentCARESACT	0.029
CY2021Q2	us-gaap	Foreclosed Assets ForeclosedAssets	11986000	USD
CY2020Q2	us-gaap	Foreclosed Assets ForeclosedAssets	15091000	USD
CY2020Q4	us-gaap	Foreclosed Assets ForeclosedAssets	12111000	USD
CY2019Q4	us-gaap	Foreclosed Assets ForeclosedAssets	18939000	USD
CY2021Q3	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	349000	USD
CY2020Q3	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	573000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	4945000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1579000	USD
CY2021Q3	fbk	Property Plant And Equipment Transfers To And From PropertyPlantAndEquipmentTransfersToAndFrom	0	USD
CY2020Q3	fbk	Property Plant And Equipment Transfers To And From PropertyPlantAndEquipmentTransfersToAndFrom	0	USD
	fbk	Property Plant And Equipment Transfers To And From PropertyPlantAndEquipmentTransfersToAndFrom	0	USD
	fbk	Property Plant And Equipment Transfers To And From PropertyPlantAndEquipmentTransfersToAndFrom	841000	USD
CY2021Q3	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	4173000	USD
CY2020Q3	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	1411000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	8834000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	5561000	USD
CY2021Q3	fbk	Gain Loss On Sale Of Foreclosed Real Estate Assets. GainLossOnSaleOfForeclosedRealEstateAssets.	2090000	USD
CY2020Q3	fbk	Gain Loss On Sale Of Foreclosed Real Estate Assets. GainLossOnSaleOfForeclosedRealEstateAssets.	119000	USD
	fbk	Gain Loss On Sale Of Foreclosed Real Estate Assets. GainLossOnSaleOfForeclosedRealEstateAssets.	3190000	USD
	fbk	Gain Loss On Sale Of Foreclosed Real Estate Assets. GainLossOnSaleOfForeclosedRealEstateAssets.	464000	USD
CY2021Q3	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	152000	USD
CY2020Q3	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	0	USD
	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	685000	USD
	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	0	USD
CY2021Q3	fbk	Foreclosed Real Estate Expense Write Downs And Liquidations ForeclosedRealEstateExpenseWriteDownsAndLiquidations	85000	USD
CY2020Q3	fbk	Foreclosed Real Estate Expense Write Downs And Liquidations ForeclosedRealEstateExpenseWriteDownsAndLiquidations	1624000	USD
	fbk	Foreclosed Real Estate Expense Write Downs And Liquidations ForeclosedRealEstateExpenseWriteDownsAndLiquidations	712000	USD
	fbk	Foreclosed Real Estate Expense Write Downs And Liquidations ForeclosedRealEstateExpenseWriteDownsAndLiquidations	1832000	USD
CY2021Q3	us-gaap	Foreclosed Assets ForeclosedAssets	10015000	USD
CY2020Q3	us-gaap	Foreclosed Assets ForeclosedAssets	12748000	USD
CY2021Q3	us-gaap	Foreclosed Assets ForeclosedAssets	10015000	USD
CY2020Q3	us-gaap	Foreclosed Assets ForeclosedAssets	12748000	USD
	us-gaap	Payments To Acquire Held For Sale Real Estate PaymentsToAcquireHeldForSaleRealEstate	3501000	USD
CY2020	us-gaap	Payments To Acquire Held For Sale Real Estate PaymentsToAcquireHeldForSaleRealEstate	5703000	USD
CY2021Q3	fbk	Lessee Number Of Operating Leases LesseeNumberOfOperatingLeases	55	lease
CY2021Q3	fbk	Lessee Number Of Finance Leases LesseeNumberOfFinanceLeases	1	branch
CY2021Q3	fbk	Lessee Number Of Total Operating Leases Noncurrent LesseeNumberOfTotalOperatingLeasesNoncurrent	44	lease
CY2021Q3	fbk	Lessee Number Of Total Finance Leases Noncurrent LesseeNumberOfTotalFinanceLeasesNoncurrent	1	branch
CY2021Q3	fbk	Lessee Operating And Finance Lease Number Of Options To Renew LesseeOperatingAndFinanceLeaseNumberOfOptionsToRenew	1	lease_renewal_option
CY2021Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	44006000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	49537000	USD
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	1505000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	1588000	USD
CY2021Q3	fbk	Right Of Use Asset RightOfUseAsset	45511000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	1598000	USD
CY2020Q4	fbk	Right Of Use Asset RightOfUseAsset	51125000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	48875000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	55187000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	1532000	USD
CY2021Q3	fbk	Lease Liability LeaseLiability	50407000	USD
CY2020Q4	fbk	Lease Liability LeaseLiability	56785000	USD
CY2021Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P12Y4M24D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P12Y2M12D
CY2021Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P13Y7M6D
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P14Y4M24D
CY2021Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0272
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0265
CY2021Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0176
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0176
CY2021Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	1838000	USD
CY2020Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	1663000	USD
CY2021Q3	us-gaap	Variable Lease Cost VariableLeaseCost	284000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	5948000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	4341000	USD
CY2021Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	107000	USD
CY2020Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	95000	USD
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	296000	USD
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	261000	USD
CY2020Q3	us-gaap	Variable Lease Cost VariableLeaseCost	78000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	760000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	376000	USD
CY2021Q3	fbk	Gain Loss On Modification And Termination Of Lease GainLossOnModificationAndTerminationOfLease	14000	USD
CY2020Q3	fbk	Gain Loss On Modification And Termination Of Lease GainLossOnModificationAndTerminationOfLease	0	USD
	fbk	Gain Loss On Modification And Termination Of Lease GainLossOnModificationAndTerminationOfLease	801000	USD
	fbk	Gain Loss On Modification And Termination Of Lease GainLossOnModificationAndTerminationOfLease	0	USD
CY2021Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	7000	USD
CY2020Q3	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	0	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	21000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	0	USD
CY2021Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	28000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	0	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	83000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	0	USD
CY2021Q3	us-gaap	Lease Cost LeaseCost	2250000	USD
CY2020Q3	us-gaap	Lease Cost LeaseCost	1836000	USD
	us-gaap	Lease Cost LeaseCost	6307000	USD
	us-gaap	Lease Cost LeaseCost	4978000	USD
CY2021Q3	fbk	Gain Loss On Modification And Termination Of Lease GainLossOnModificationAndTerminationOfLease	14000	USD
	fbk	Gain Loss On Modification And Termination Of Lease GainLossOnModificationAndTerminationOfLease	801000	USD
CY2020Q3	fbk	Gain Loss On Modification And Termination Of Lease GainLossOnModificationAndTerminationOfLease	0	USD
	fbk	Gain Loss On Modification And Termination Of Lease GainLossOnModificationAndTerminationOfLease	0	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	7434000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due In Next Rolling Twelve Months FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths	116000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Two LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo	6110000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Two FinanceLeaseLiabilityPaymentsDueInRollingYearTwo	117000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Three LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree	5180000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Three FinanceLeaseLiabilityPaymentsDueInRollingYearThree	119000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Four LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour	4765000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Four FinanceLeaseLiabilityPaymentsDueInRollingYearFour	121000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive	4637000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due In Rolling Year Five FinanceLeaseLiabilityPaymentsDueInRollingYearFive	123000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive	29784000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due In Rolling After Year Five FinanceLeaseLiabilityPaymentsDueInRollingAfterYearFive	1133000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	57910000	USD
CY2021Q3	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	1729000	USD
CY2021Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	9035000	USD
CY2021Q3	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	197000	USD
CY2021Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	48875000	USD
CY2021Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	1532000	USD
CY2021Q2	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	101615000	USD
CY2020Q2	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	60508000	USD
CY2020Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	79997000	USD
CY2019Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	75521000	USD
CY2021Q3	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	9215000	USD
CY2020Q3	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	18202000	USD
	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	31382000	USD
	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	33415000	USD
CY2021Q3	fbk	Servicing Asset At Amortized Cost Additions From Acquisition ServicingAssetAtAmortizedCostAdditionsFromAcquisition	0	USD
CY2020Q3	fbk	Servicing Asset At Amortized Cost Additions From Acquisition ServicingAssetAtAmortizedCostAdditionsFromAcquisition	4850000	USD
	fbk	Servicing Asset At Amortized Cost Additions From Acquisition ServicingAssetAtAmortizedCostAdditionsFromAcquisition	0	USD
	fbk	Servicing Asset At Amortized Cost Additions From Acquisition ServicingAssetAtAmortizedCostAdditionsFromAcquisition	4850000	USD
CY2021Q3	fbk	Servicing Asset At Fair Value Changes In Fair Value Due To Pay Offs Or Pay Downs ServicingAssetAtFairValueChangesInFairValueDueToPayOffsOrPayDowns	-7302000	USD
CY2020Q3	fbk	Servicing Asset At Fair Value Changes In Fair Value Due To Pay Offs Or Pay Downs ServicingAssetAtFairValueChangesInFairValueDueToPayOffsOrPayDowns	-7756000	USD
	fbk	Servicing Asset At Fair Value Changes In Fair Value Due To Pay Offs Or Pay Downs ServicingAssetAtFairValueChangesInFairValueDueToPayOffsOrPayDowns	-24488000	USD
	fbk	Servicing Asset At Fair Value Changes In Fair Value Due To Pay Offs Or Pay Downs ServicingAssetAtFairValueChangesInFairValueDueToPayOffsOrPayDowns	-19676000	USD
CY2021Q3	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	7063000	USD
CY2020Q3	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	581000	USD
	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	23700000	USD
	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	-22575000	USD
CY2021Q3	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	110591000	USD
CY2020Q3	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	71535000	USD
CY2021Q3	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	110591000	USD
CY2020Q3	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	71535000	USD
CY2021Q3	us-gaap	Contractually Specified Servicing Fees Amount ContractuallySpecifiedServicingFeesAmount	7539000	USD
CY2020Q3	us-gaap	Contractually Specified Servicing Fees Amount ContractuallySpecifiedServicingFeesAmount	5536000	USD
	us-gaap	Contractually Specified Servicing Fees Amount ContractuallySpecifiedServicingFeesAmount	21258000	USD
	us-gaap	Contractually Specified Servicing Fees Amount ContractuallySpecifiedServicingFeesAmount	15667000	USD
CY2021Q3	fbk	Change In Fair Value Of Mortgage Servicing Rights ChangeInFairValueOfMortgageServicingRights	239000	USD
CY2020Q3	fbk	Change In Fair Value Of Mortgage Servicing Rights ChangeInFairValueOfMortgageServicingRights	7175000	USD
	fbk	Change In Fair Value Of Mortgage Servicing Rights ChangeInFairValueOfMortgageServicingRights	788000	USD
	fbk	Change In Fair Value Of Mortgage Servicing Rights ChangeInFairValueOfMortgageServicingRights	42251000	USD
CY2021Q3	fbk	Change In Fair Value Of Derivative Hedging Instruments ChangeInFairValueOfDerivativeHedgingInstruments	2128000	USD
CY2020Q3	fbk	Change In Fair Value Of Derivative Hedging Instruments ChangeInFairValueOfDerivativeHedgingInstruments	265000	USD
	fbk	Change In Fair Value Of Derivative Hedging Instruments ChangeInFairValueOfDerivativeHedgingInstruments	9987000	USD
	fbk	Change In Fair Value Of Derivative Hedging Instruments ChangeInFairValueOfDerivativeHedgingInstruments	-15705000	USD
CY2021Q3	fbk	Contractually Specified Servicing Fee Late Fee And Ancillary Fee Earned In Exchange For Servicing Financial Asset Liabilities ContractuallySpecifiedServicingFeeLateFeeAndAncillaryFeeEarnedInExchangeForServicingFinancialAssetLiabilities	5172000	USD
CY2020Q3	fbk	Contractually Specified Servicing Fee Late Fee And Ancillary Fee Earned In Exchange For Servicing Financial Asset Liabilities ContractuallySpecifiedServicingFeeLateFeeAndAncillaryFeeEarnedInExchangeForServicingFinancialAssetLiabilities	-1904000	USD
	fbk	Contractually Specified Servicing Fee Late Fee And Ancillary Fee Earned In Exchange For Servicing Financial Asset Liabilities ContractuallySpecifiedServicingFeeLateFeeAndAncillaryFeeEarnedInExchangeForServicingFinancialAssetLiabilities	10483000	USD
	fbk	Contractually Specified Servicing Fee Late Fee And Ancillary Fee Earned In Exchange For Servicing Financial Asset Liabilities ContractuallySpecifiedServicingFeeLateFeeAndAncillaryFeeEarnedInExchangeForServicingFinancialAssetLiabilities	-10879000	USD
CY2021Q3	fbk	Gross Servicing Expense GrossServicingExpense	2156000	USD
CY2020Q3	fbk	Gross Servicing Expense GrossServicingExpense	1999000	USD
	fbk	Gross Servicing Expense GrossServicingExpense	7381000	USD
	fbk	Gross Servicing Expense GrossServicingExpense	5392000	USD
CY2021Q3	fbk	Servicing Income Loss ServicingIncomeLoss	3016000	USD
CY2020Q3	fbk	Servicing Income Loss ServicingIncomeLoss	-3903000	USD
	fbk	Servicing Income Loss ServicingIncomeLoss	3102000	USD
	fbk	Servicing Income Loss ServicingIncomeLoss	-16271000	USD
CY2021Q3	us-gaap	Continuing Involvement With Transferred Financial Assets Principal Amount Outstanding ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding	10633805000	USD
CY2020Q4	us-gaap	Continuing Involvement With Transferred Financial Assets Principal Amount Outstanding ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding	9787657000	USD
CY2020Q4	us-gaap	Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of10 Percent Adverse Change In Prepayment Speed SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed	4493000	USD
CY2021Q3	us-gaap	Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of20 Percent Adverse Change In Prepayment Speed SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed	9107000	USD
CY2020	us-gaap	Assumption For Fair Value Of Assets Or Liabilities That Relate To Transferors Continuing Involvement Weighted Average Life1 AssumptionForFairValueOfAssetsOrLiabilitiesThatRelateToTransferorsContinuingInvolvementWeightedAverageLife1	P328M
	us-gaap	Assumption For Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Prepayment Speed AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed	0.0946
CY2020	us-gaap	Assumption For Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Prepayment Speed AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed	0.1407
CY2021Q3	us-gaap	Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of10 Percent Adverse Change In Prepayment Speed SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed	4737000	USD
CY2020Q4	us-gaap	Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of20 Percent Adverse Change In Prepayment Speed SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed	8599000	USD
	us-gaap	Assumption For Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Discount Rate AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesDiscountRate	0.1156
CY2020	us-gaap	Assumption For Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Discount Rate AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesDiscountRate	0.1149
CY2021Q3	fbk	Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transfer Or Servicing Assets Or Liabilities Impact Of One Percent Adverse Change In Discount Rate SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferOrServicingAssetsOrLiabilitiesImpactOfOnePercentAdverseChangeInDiscountRate	4454000	USD
CY2020Q4	fbk	Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transfer Or Servicing Assets Or Liabilities Impact Of One Percent Adverse Change In Discount Rate SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferOrServicingAssetsOrLiabilitiesImpactOfOnePercentAdverseChangeInDiscountRate	2942000	USD
CY2021Q3	fbk	Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Two Percent Adverse Change In Discount Rate SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfTwoPercentAdverseChangeInDiscountRate	8571000	USD
CY2020Q4	fbk	Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Two Percent Adverse Change In Discount Rate SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfTwoPercentAdverseChangeInDiscountRate	5674000	USD
	fbk	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Coupon Interest Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageCouponInterestRate	0.0329
CY2020	fbk	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Coupon Interest Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageCouponInterestRate	0.0358
	fbk	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Servicing Fee ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageServicingFee	0.0027
CY2020	fbk	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Servicing Fee ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageServicingFee	0.0028
	us-gaap	Assumption For Fair Value Of Assets Or Liabilities That Relate To Transferors Continuing Involvement Weighted Average Life1 AssumptionForFairValueOfAssetsOrLiabilitiesThatRelateToTransferorsContinuingInvolvementWeightedAverageLife1	P330M
CY2021Q3	us-gaap	Escrow Deposit EscrowDeposit	190631000	USD
CY2020Q4	us-gaap	Escrow Deposit EscrowDeposit	147957000	USD
CY2021Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2350000	USD
CY2020Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	13123000	USD
CY2021Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	7366000	USD
CY2020Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-15163000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9716000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2040000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	17840000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	37038000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	20904000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-31543000	USD
CY2021Q3	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	11551000	USD
CY2021Q3	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38744000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5495000	USD
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2020Q3	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-1604000	USD
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2021Q3	fbk	Income Tax Reconciliation Change In State Taxes Net Of Federal Benefit IncomeTaxReconciliationChangeInStateTaxesNetOfFederalBenefit	3279000	USD
CY2021Q3	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.060
CY2020Q3	fbk	Income Tax Reconciliation Change In State Taxes Net Of Federal Benefit IncomeTaxReconciliationChangeInStateTaxesNetOfFederalBenefit	100000	USD
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.013
CY2021Q3	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-1784000	USD
CY2021Q3	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.032
CY2020Q3	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-7000	USD
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.001
CY2021Q3	fbk	Income Tax Reconciliation Permanent Items IncomeTaxReconciliationPermanentItems	-416000	USD
CY2021Q3	fbk	Effective Income Tax Rate Reconciliation Municipal Interest Income Net Of Interest Disallowance Percent EffectiveIncomeTaxRateReconciliationMunicipalInterestIncomeNetOfInterestDisallowancePercent	-0.008
CY2020Q3	fbk	Income Tax Reconciliation Permanent Items IncomeTaxReconciliationPermanentItems	-422000	USD
CY2020Q3	fbk	Effective Income Tax Rate Reconciliation Municipal Interest Income Net Of Interest Disallowance Percent EffectiveIncomeTaxRateReconciliationMunicipalInterestIncomeNetOfInterestDisallowancePercent	0.055
CY2021Q3	fbk	Income Tax Reconciliation Bank Owned Life Insurance IncomeTaxReconciliationBankOwnedLifeInsurance	74000	USD
CY2021Q3	fbk	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Percent EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsurancePercent	0.001
CY2020Q3	fbk	Income Tax Reconciliation Bank Owned Life Insurance IncomeTaxReconciliationBankOwnedLifeInsurance	55000	USD
CY2020Q3	fbk	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Percent EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsurancePercent	-0.007
CY2021Q3	fbk	Effective Income Tax Reconciliation Operating Loss Carryback Cares Act Amount EffectiveIncomeTaxReconciliationOperatingLossCarrybackCARESActAmount	3424000	USD
CY2021Q3	fbk	Effective Income Tax Reconciliation Operating Loss Carryback Care Act Percent EffectiveIncomeTaxReconciliationOperatingLossCarrybackCAREActPercent	0.062
CY2020Q3	fbk	Effective Income Tax Reconciliation Operating Loss Carryback Cares Act Amount EffectiveIncomeTaxReconciliationOperatingLossCarrybackCARESActAmount		USD
CY2020Q3	fbk	Effective Income Tax Reconciliation Operating Loss Carryback Care Act Percent EffectiveIncomeTaxReconciliationOperatingLossCarrybackCAREActPercent
CY2021Q3	fbk	Income Tax Reconciliation Change In Merger And Offering Costs IncomeTaxReconciliationChangeInMergerAndOfferingCosts	0	USD
CY2021Q3	fbk	Effective Income Tax Rate Reconciliation Nondeductible Expense Merger And Offering Costs EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMergerAndOfferingCosts	0
CY2020Q3	fbk	Income Tax Reconciliation Change In Merger And Offering Costs IncomeTaxReconciliationChangeInMergerAndOfferingCosts	126000	USD
CY2020Q3	fbk	Effective Income Tax Rate Reconciliation Nondeductible Expense Merger And Offering Costs EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMergerAndOfferingCosts	-0.016
CY2021Q3	fbk	Income Tax Reconciliation Nondeductible Income Share Based Compensation Cost IncomeTaxReconciliationNondeductibleIncomeShareBasedCompensationCost	1065000	USD
CY2021Q3	fbk	Income Tax Reconciliation Nondeductible Income Share Based Compensation Cost Percent IncomeTaxReconciliationNondeductibleIncomeShareBasedCompensationCostPercent	0.019
CY2020Q3	fbk	Income Tax Reconciliation Nondeductible Income Share Based Compensation Cost IncomeTaxReconciliationNondeductibleIncomeShareBasedCompensationCost	0	USD
CY2020Q3	fbk	Income Tax Reconciliation Nondeductible Income Share Based Compensation Cost Percent IncomeTaxReconciliationNondeductibleIncomeShareBasedCompensationCostPercent	0
CY2021Q3	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-481000	USD
CY2021Q3	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	-0.009
CY2020Q3	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-178000	USD
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.023
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9716000	USD
CY2021Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.177
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2040000	USD
CY2020Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.267
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	37844000	USD
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	4938000	USD
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
	fbk	Income Tax Reconciliation Change In State Taxes Net Of Federal Benefit IncomeTaxReconciliationChangeInStateTaxesNetOfFederalBenefit	6908000	USD
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.038
	fbk	Income Tax Reconciliation Change In State Taxes Net Of Federal Benefit IncomeTaxReconciliationChangeInStateTaxesNetOfFederalBenefit	1266000	USD
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.054
	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-2129000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.012
	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	154000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.007
	fbk	Income Tax Reconciliation Permanent Items IncomeTaxReconciliationPermanentItems	-1259000	USD
	fbk	Effective Income Tax Rate Reconciliation Municipal Interest Income Net Of Interest Disallowance Percent EffectiveIncomeTaxRateReconciliationMunicipalInterestIncomeNetOfInterestDisallowancePercent	-0.007
	fbk	Income Tax Reconciliation Permanent Items IncomeTaxReconciliationPermanentItems	-996000	USD
	fbk	Effective Income Tax Rate Reconciliation Municipal Interest Income Net Of Interest Disallowance Percent EffectiveIncomeTaxRateReconciliationMunicipalInterestIncomeNetOfInterestDisallowancePercent	-0.042
	fbk	Income Tax Reconciliation Bank Owned Life Insurance IncomeTaxReconciliationBankOwnedLifeInsurance	240000	USD
	fbk	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Percent EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsurancePercent	0.001
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CY2020Q4	fbk	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	14496000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	1541000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	1753000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	6798000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	8872000	USD
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CY2020Q4	fbk	Deferred Tax Assets Unrealized Losses On Cash Flow Hedges DeferredTaxAssetsUnrealizedLossesOnCashFlowHedges	499000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	13886000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	19101000	USD
CY2021Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	74436000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	93130000	USD
CY2021Q3	fbk	Deferred Tax Liabilities Federal Home Loan Bank Stock Dividends DeferredTaxLiabilitiesFederalHomeLoanBankStockDividends	484000	USD
CY2020Q4	fbk	Deferred Tax Liabilities Federal Home Loan Bank Stock Dividends DeferredTaxLiabilitiesFederalHomeLoanBankStockDividends	561000	USD
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CY2020Q4	fbk	Deferred Tax Liabilities Operating Lease Right Of Use Asset DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset	13197000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	7276000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	7491000	USD
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CY2020Q4	fbk	Deferred Tax Liabilities Amortization Of Intangibles DeferredTaxLiabilitiesAmortizationOfIntangibles	684000	USD
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CY2020Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	17000	USD
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CY2020Q4	us-gaap	Deferred Tax Liabilities Unrealized Gains On Trading Securities DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities	13027000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	28774000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	20803000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	13133000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	11301000	USD
CY2021Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	4407000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	9653000	USD
CY2020Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	0	USD
CY2021Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	0	USD
CY2021Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	73792000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	76734000	USD
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CY2021Q3	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	2889884000	USD
CY2020Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	2787594000	USD
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CY2020	us-gaap	Loans And Leases Receivable Commitments Variable Rates LoansAndLeasesReceivableCommitmentsVariableRates	1650000000	USD
CY2021Q3	fbk	Principal Amount Of Loans Repurchased Or Indemnified During Period PrincipalAmountOfLoansRepurchasedOrIndemnifiedDuringPeriod	2917000	USD
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CY2020Q3	fbk	Principal Amount Of Loans Repurchased Or Indemnified During Period PrincipalAmountOfLoansRepurchasedOrIndemnifiedDuringPeriod	1329000	USD
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CY2021Q2	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	5489000	USD
CY2020Q2	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	4601000	USD
CY2020Q4	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	5928000	USD
CY2019Q4	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	3529000	USD
CY2021Q3	fbk	Provision For Mortgage Loan Repurchases Or Indemnifications ProvisionForMortgageLoanRepurchasesOrIndemnifications	0	USD
CY2020Q3	fbk	Provision For Mortgage Loan Repurchases Or Indemnifications ProvisionForMortgageLoanRepurchasesOrIndemnifications	901000	USD
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CY2021Q3	fbk	Allowance For Loan Repurchases Or Indemnifications Losses On Loans Repurchased Or Indemnified AllowanceForLoanRepurchasesOrIndemnificationsLossesOnLoansRepurchasedOrIndemnified	120000	USD
CY2020Q3	fbk	Allowance For Loan Repurchases Or Indemnifications Losses On Loans Repurchased Or Indemnified AllowanceForLoanRepurchasesOrIndemnificationsLossesOnLoansRepurchasedOrIndemnified	44000	USD
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	fbk	Allowance For Loan Repurchases Or Indemnifications Losses On Loans Repurchased Or Indemnified AllowanceForLoanRepurchasesOrIndemnificationsLossesOnLoansRepurchasedOrIndemnified	199000	USD
CY2021Q3	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	5369000	USD
CY2020Q3	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	5458000	USD
CY2021Q3	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	5369000	USD
CY2020Q3	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	5458000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	0	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	41000	USD
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CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	38000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	40000	USD
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CY2021Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	0	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	106000	USD
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CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	34051000	USD
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CY2021Q3	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	4813000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral	3863000	USD
CY2021Q3	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	19467000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral	34051000	USD
CY2021Q3	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	3816000	USD
CY2020Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	857000	USD
CY2021Q3	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	3816000	USD
CY2020Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	857000	USD
CY2021Q3	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	0	USD
CY2020Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	0	USD
CY2021Q3	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	15651000	USD
CY2020Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	33194000	USD
CY2021Q3	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	997000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	3006000	USD
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CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	0	USD
CY2021Q3	us-gaap	Profit Loss ProfitLoss	45290000	USD
CY2021Q3	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	68910000	USD
CY2020Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	57985000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	9716000	USD
CY2021Q3	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	855706000	USD
CY2020Q3	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	899173000	USD
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CY2021Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	88476000	USD
CY2021Q3	fbk	Financing Receivable And Unfunded Commitments Credit Loss Expense Reversal FinancingReceivableAndUnfundedCommitmentsCreditLossExpenseReversal	-2531000	USD
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CY2021Q3	fbk	Change In Fair Value Of Mortgage Servicing Rights And Hedging Instruments ChangeInFairValueOfMortgageServicingRightsAndHedgingInstruments	2367000	USD
CY2021Q3	us-gaap	Noninterest Income Other NoninterestIncomeOther	13622000	USD
CY2021Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	2140000	USD
CY2021Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1344000	USD
CY2021Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	91523000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	55006000	USD
CY2021Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	45290000	USD
CY2021Q3	us-gaap	Assets Assets	11810290000	USD
CY2021Q3	us-gaap	Goodwill Goodwill	242561000	USD
CY2021Q3	fbk	Unfunded Commitments Credit Loss Expense Reversal UnfundedCommitmentsCreditLossExpenseReversal	301000	USD
CY2020Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	68828000	USD
CY2020Q3	fbk	Financing Receivable And Unfunded Commitments Credit Loss Expense Reversal FinancingReceivableAndUnfundedCommitmentsCreditLossExpenseReversal	55401000	USD
CY2020Q3	fbk	Fees And Commissions Mortgage Banking Before Adjustments FeesAndCommissionsMortgageBankingBeforeAdjustments	92126000	USD
CY2020Q3	fbk	Change In Fair Value Of Mortgage Servicing Rights And Hedging Instruments ChangeInFairValueOfMortgageServicingRightsAndHedgingInstruments	7440000	USD
CY2020Q3	us-gaap	Noninterest Income Other NoninterestIncomeOther	12340000	USD
CY2020Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1823000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1417000	USD
CY2020Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	114852000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-7639000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2040000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	-5599000	USD
CY2020Q3	fbk	Unfunded Commitments Credit Loss Expense Reversal UnfundedCommitmentsCreditLossExpenseReversal	9567000	USD
CY2020Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-5599000	USD
CY2020Q3	us-gaap	Assets Assets	11010438000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	236086000	USD
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	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	180210000	USD
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CY2021Q3	us-gaap	Assets Assets	11810290000	USD
CY2021Q3	us-gaap	Goodwill Goodwill	242561000	USD
	fbk	Unfunded Commitments Credit Loss Expense Reversal UnfundedCommitmentsCreditLossExpenseReversal	-2875000	USD
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CY2020Q3	us-gaap	Assets Assets	11010438000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	236086000	USD
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CY2020Q4	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	24675000	USD
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CY2021Q3	us-gaap	Loans And Leases Receivable Related Parties LoansAndLeasesReceivableRelatedParties	30744000	USD
CY2021Q3	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	320207000	USD
CY2020Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	245084000	USD

Files In Submission

Name	View Source	Status
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0001649749-21-000180-index.html	Edgar Link	pending
0001649749-21-000180.txt	Edgar Link	pending
0001649749-21-000180-xbrl.zip	Edgar Link	pending
a3q21ex-311.htm	Edgar Link	pending
a3q21ex-312.htm	Edgar Link	pending
a3q21ex-321.htm	Edgar Link	pending
fbk-20210930.htm	Edgar Link	pending
fbk-20210930.xsd	Edgar Link	pending
fbk-20210930_cal.xml	Edgar Link	unprocessable
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fbk-20210930_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R102.htm	Edgar Link	pending
R103.htm	Edgar Link	pending
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2021 Q4 Form 10-Q Financial Statement

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Income Statement

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