$FBK
FB Financial Corp Stock $fbk

$fbk Overview Financials Valuation SEC Filings Company Website

2020 Q3 Form 10-Q Financial Statement

#000164974920000194 Filed on November 06, 2020

Income Statement

Concept	2020 Q3	2019 Q4	2019 Q3
Revenue	$81.13M	$71.64M	$73.24M
YoY Change	10.77%		16.98%
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	$3.100M	$2.500M	$2.500M
YoY Change	24.0%	38.89%	38.89%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$12.30M	$13.95M	$14.94M
YoY Change	-17.66%		51.54%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	-$7.639M	$27.30M	$31.68M
YoY Change	-124.11%	20.26%	12.84%
Income Tax	-$2.040M	$5.718M	$7.718M
% Of Pretax Income		20.95%	24.36%
Net Earnings	-$5.599M	$21.57M	$23.97M
YoY Change	-123.36%	26.89%	12.11%
Net Earnings / Revenue	-6.9%	30.11%	32.72%
Basic Earnings Per Share	-$0.14	$0.69	$0.77
Diluted Earnings Per Share	-$0.14	$0.68	$0.76
COMMON SHARES
Basic Shares Outstanding	40.15M shares	30.93M shares	30.90M shares
Diluted Shares Outstanding	40.64M shares	31.47M shares	31.43M shares

Balance Sheet

Concept	2020 Q3	2019 Q4	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$1.062B	$232.7M	$243.0M
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	$136.8M	$90.13M	$91.82M
YoY Change	48.97%	3.74%	6.76%
Goodwill	$236.1M	$169.1M	$168.5M
YoY Change	40.12%	23.22%	22.81%
Intangibles
YoY Change
Long-Term Investments	$4.000M	$3.000M	$3.000M
YoY Change	33.33%	0.0%	0.0%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$11.01B	$6.125B	$6.089B
YoY Change	80.83%	19.24%	20.38%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$233.0M	$123.0M	$115.0M
YoY Change	102.61%	89.23%	66.67%
Deferred Revenue
YoY Change
Short-Term Debt		$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$233.0M	$123.0M	$115.0M
YoY Change	102.61%	89.23%	66.67%
LONG-TERM LIABILITIES
Long-Term Debt	$239.0M	$305.0M	$307.0M
YoY Change	-22.15%	33.77%	45.5%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$239.0M	$305.0M	$307.0M
YoY Change	-22.15%	33.77%	45.5%
TOTAL LIABILITIES
Total Short-Term Liabilities	$233.0M	$123.0M	$115.0M
Total Long-Term Liabilities	$239.0M	$305.0M	$307.0M
Total Liabilities	$9.765B	$5.363B	$5.344B
YoY Change	82.73%	20.11%	21.21%
SHAREHOLDERS EQUITY
Retained Earnings	$276.4M	$293.5M	$274.5M
YoY Change	0.68%	32.69%
Common Stock	$943.4M	$456.7M	$457.7M
YoY Change	106.09%	0.39%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.245B	$762.3M	$744.8M
YoY Change
Total Liabilities & Shareholders Equity	$11.01B	$6.125B	$6.089B
YoY Change	80.83%	19.24%	20.38%

Cashflow Statement

Concept	2020 Q3	2019 Q4	2019 Q3
OPERATING ACTIVITIES
Net Income	-$5.599M	$21.57M	$23.97M
YoY Change	-123.36%	26.89%	12.11%
Depreciation, Depletion And Amortization	$3.100M	$2.500M	$2.500M
YoY Change	24.0%	38.89%	38.89%
Cash From Operating Activities	$5.700M	$80.10M	-$3.100M
YoY Change	-283.87%	12.03%	-105.01%
INVESTING ACTIVITIES
Capital Expenditures	$2.100M	-$2.700M	-$3.100M
YoY Change	-167.74%	80.0%	55.0%
Acquisitions
YoY Change
Other Investing Activities	$259.0M	-$93.20M	-$41.00M
YoY Change	-731.71%	-49.02%	-40.58%
Cash From Investing Activities	$261.2M	-$96.00M	-$44.00M
YoY Change	-693.64%	-47.91%	-38.03%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	77.90M	5.600M	125.6M
YoY Change	-37.98%	-90.11%	45.54%
NET CHANGE
Cash From Operating Activities	5.700M	80.10M	-3.100M
Cash From Investing Activities	261.2M	-96.00M	-44.00M
Cash From Financing Activities	77.90M	5.600M	125.6M
Net Change In Cash	344.8M	-10.30M	78.50M
YoY Change	339.24%	-81.67%	1.68%
FREE CASH FLOW
Cash From Operating Activities	$5.700M	$80.10M	-$3.100M
Capital Expenditures	$2.100M	-$2.700M	-$3.100M
Free Cash Flow	$3.600M	$82.80M	$0.00
YoY Change		13.42%	-100.0%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2019Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1449000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2040000	USD
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Entity Central Index Key EntityCentralIndexKey	0001649749
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList	us-gaap:OtherAssets
CY2020Q3	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	us-gaap:DebtLongtermAndShorttermCombinedAmount
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-09-30
	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 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	City Area Code CityAreaCode	615
	dei	Local Phone Number LocalPhoneNumber	564-1212
	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 Emerging Growth Company EntityEmergingGrowthCompany	true
	dei	Entity Ex Transition Period EntityExTransitionPeriod	true
	dei	Entity Shell Company EntityShellCompany	false
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	dei	Security12b Title Security12bTitle	Common Stock, Par Value $1.00 Per Share
	dei	Trading Symbol TradingSymbol	FBK
	dei	Security Exchange Name SecurityExchangeName	NYSE
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	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	7843000	USD
CY2020Q3	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	20730000	USD
CY2019Q3	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	295000	USD
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	25366000	USD
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	4699000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1417000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1197000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3825000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3180000	USD
CY2020Q3	us-gaap	Advertising Expense AdvertisingExpense	2256000	USD
CY2019Q3	us-gaap	Advertising Expense AdvertisingExpense	1895000	USD
	us-gaap	Advertising Expense AdvertisingExpense	7236000	USD
	us-gaap	Advertising Expense AdvertisingExpense	7066000	USD
CY2020Q3	fbk	Noninterest Expense Other NoninterestExpenseOther	16210000	USD
CY2019Q3	fbk	Noninterest Expense Other NoninterestExpenseOther	9801000	USD
	fbk	Noninterest Expense Other NoninterestExpenseOther	37425000	USD
	fbk	Noninterest Expense Other NoninterestExpenseOther	29353000	USD
CY2020Q3	us-gaap	Noninterest Expense NoninterestExpense	118092000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	62935000	USD
	us-gaap	Noninterest Expense NoninterestExpense	267230000	USD
	us-gaap	Noninterest Expense NoninterestExpense	182155000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-7639000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	31684000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	23514000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	82249000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2040000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7718000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5495000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20007000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	-5599000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	23966000	USD
	us-gaap	Profit Loss ProfitLoss	18019000	USD
	us-gaap	Profit Loss ProfitLoss	62242000	USD
CY2020Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2019Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-5599000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	23966000	USD
	us-gaap	Net Income Loss NetIncomeLoss	18019000	USD
	us-gaap	Net Income Loss NetIncomeLoss	62242000	USD
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.14
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.77
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.01
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.14
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.76
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.97
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-5599000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	23966000	USD
	us-gaap	Net Income Loss NetIncomeLoss	18019000	USD
	us-gaap	Net Income Loss NetIncomeLoss	62242000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	521000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1296000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	5225000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	6430000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1788000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	3762000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	15091000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	18265000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-137000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	20000	USD
	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	20000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	387000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-55000	USD
	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	-56000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	40000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-90000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-403000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-407000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	112000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-256000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-1145000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-1151000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-41000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-46000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-145000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-121000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	115000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	130000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	410000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	343000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1398000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	3431000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	13149000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	16827000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-4201000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	27397000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	31168000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	79069000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2019Q3	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	0	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-4201000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	27397000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	31168000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	79069000	USD
CY2020Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	805216000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-5599000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1398000	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	Net Income Loss NetIncomeLoss	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
CY2019Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	718759000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	23966000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	3431000	USD
CY2019Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1836000	USD
CY2019Q3	us-gaap	Restricted Stock Value Shares Issued Net Of Tax Withholdings RestrictedStockValueSharesIssuedNetOfTaxWithholdings	-1042000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	440000	USD
CY2019Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.08
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	2555000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	744835000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	671857000	USD
	us-gaap	Net Income Loss NetIncomeLoss	62242000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	16827000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5621000	USD
	us-gaap	Restricted Stock Value Shares Issued Net Of Tax Withholdings RestrictedStockValueSharesIssuedNetOfTaxWithholdings	-3552000	USD
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	804000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.24
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	7655000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	744835000	USD
	us-gaap	Net Income Loss NetIncomeLoss	18019000	USD
	us-gaap	Net Income Loss NetIncomeLoss	62242000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	4924000	USD
	fbk	Change In Fair Value Of Mortgage Servicing Rights ChangeInFairValueOfMortgageServicingRights	42251000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	3830000	USD
	fbk	Amortization Of Other Intangible Assets AmortizationOfOtherIntangibleAssets	3825000	USD
	fbk	Amortization Of Other Intangible Assets AmortizationOfOtherIntangibleAssets	3180000	USD
	fbk	Capitalization Of Mortgage Servicing Rights Ms Rs CapitalizationOfMortgageServicingRightsMSRs	33415000	USD
	fbk	Capitalization Of Mortgage Servicing Rights Ms Rs CapitalizationOfMortgageServicingRightsMSRs	30319000	USD
	fbk	Change In Fair Value Of Mortgage Servicing Rights ChangeInFairValueOfMortgageServicingRights	23832000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	7253000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	5621000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	97837000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	4103000	USD
	fbk	Provisionfor Credit Losses On Unfunded Commitments ProvisionforCreditLossesOnUnfundedCommitments	13050000	USD
	fbk	Provisionfor Credit Losses On Unfunded Commitments ProvisionforCreditLossesOnUnfundedCommitments	0	USD
	fbk	Provision For Mortgage Loan Repurchases Or Indemnifications ProvisionForMortgageLoanRepurchasesOrIndemnifications	2128000	USD
	fbk	Provision For Mortgage Loan Repurchases Or Indemnifications ProvisionForMortgageLoanRepurchasesOrIndemnifications	255000	USD
	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	3080000	USD
	us-gaap	Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Accretion CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYieldAccretion	6030000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-4431000	USD
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-2113000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	618000	USD
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	75000	USD
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	4739497000	USD
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	3477658000	USD
	us-gaap	Payments To Purchase Loans Held For Sale PaymentsToPurchaseLoansHeldForSale	0	USD
	us-gaap	Payments To Purchase Loans Held For Sale PaymentsToPurchaseLoansHeldForSale	9919000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	4690135000	USD
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	3527632000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	202336000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	72749000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	-1368000	USD
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	112000	USD
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	-156000	USD
	us-gaap	Gain Loss On Sale Of Other Assets GainLossOnSaleOfOtherAssets	52000	USD
	fbk	Goodwill Relief Written Off Related To Sale Of Business Unit GoodwillReliefWrittenOffRelatedToSaleOfBusinessUnit	0	USD
	fbk	Goodwill Relief Written Off Related To Sale Of Business Unit GoodwillReliefWrittenOffRelatedToSaleOfBusinessUnit	100000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-31543000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5900000	USD
	fbk	Increase Decrease In Operating Leases IncreaseDecreaseInOperatingLeases	1309000	USD
	fbk	Increase Decrease In Operating Leases IncreaseDecreaseInOperatingLeases	0	USD
	fbk	Increase Decrease In Other Assets And Interest Receivable IncreaseDecreaseInOtherAssetsAndInterestReceivable	-77566000	USD
	fbk	Increase Decrease In Other Assets And Interest Receivable IncreaseDecreaseInOtherAssetsAndInterestReceivable	-50509000	USD
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	59325000	USD
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	4243000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-142044000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-16172000	USD
	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	24498000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	140246000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	78861000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	214285000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	92059000	USD
	us-gaap	Increase Decrease In Other Loans IncreaseDecreaseInOtherLoans	133893000	USD
	us-gaap	Increase Decrease In Other Loans IncreaseDecreaseInOtherLoans	295791000	USD
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	515000	USD
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	2544000	USD
	us-gaap	Proceeds From Sale Of Mortgage Servicing Rights Msr ProceedsFromSaleOfMortgageServicingRightsMSR	0	USD
	us-gaap	Proceeds From Sale Of Mortgage Servicing Rights Msr ProceedsFromSaleOfMortgageServicingRightsMSR	29160000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2652000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	4052000	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1275000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	5561000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	2718000	USD
	fbk	Payments For Proceeds From Acquire Businesses Net Of Cash Acquired PaymentsForProceedsFromAcquireBusinessesNetOfCashAcquired	-248439000	USD
	fbk	Payments For Proceeds From Acquire Businesses Net Of Cash Acquired PaymentsForProceedsFromAcquireBusinessesNetOfCashAcquired	-171032000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	71158000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-86902000	USD
	us-gaap	Increase Decrease In Demand Deposits IncreaseDecreaseInDemandDeposits	1043928000	USD
	fbk	Increase Decrease In Securities Sold Under Agreements To Repurchase IncreaseDecreaseInSecuritiesSoldUnderAgreementsToRepurchase	5532000	USD
	us-gaap	Increase Decrease In Demand Deposits IncreaseDecreaseInDemandDeposits	231763000	USD
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-201659000	USD
	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	-70594000	USD
	fbk	Increase Decrease In Securities Sold Under Agreements To Repurchase IncreaseDecreaseInSecuritiesSoldUnderAgreementsToRepurchase	1546000	USD
	fbk	Increase Decrease In Fhlb Advances IncreaseDecreaseInFHLBAdvances	-50000000	USD
	fbk	Increase Decrease In Fhlb Advances IncreaseDecreaseInFHLBAdvances	68235000	USD
	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	100000000	USD
	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	0	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1890000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
	fbk	Proceeds From Other Borrowings ProceedsFromOtherBorrowings	15000000	USD
	fbk	Proceeds From Other Borrowings ProceedsFromOtherBorrowings	0	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1268000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	3552000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	978000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	804000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	10025000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	7487000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	900596000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	220715000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	829710000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	117641000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	232681000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	125356000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1062391000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	242997000	USD
	us-gaap	Interest Paid Net InterestPaidNet	36498000	USD
	us-gaap	Interest Paid Net InterestPaidNet	41463000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	16449000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	21377000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1579000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	3565000	USD
	fbk	Other Real Estate Owned Transfer To Other Real Estate Owned OtherRealEstateOwnedTransferToOtherRealEstateOwned	841000	USD
	fbk	Other Real Estate Owned Transfer To Other Real Estate Owned OtherRealEstateOwnedTransferToOtherRealEstateOwned	0	USD
	us-gaap	Property Plant And Equipment Transfers And Changes PropertyPlantAndEquipmentTransfersAndChanges	0	USD
	us-gaap	Property Plant And Equipment Transfers And Changes PropertyPlantAndEquipmentTransfersAndChanges	2640000	USD
	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	0	USD
	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	166000	USD
	fbk	Transfer Of Portfolio Loans To Held For Sale TransferOfPortfolioLoansToHeldForSale	9304000	USD
	fbk	Transfer Of Portfolio Loans To Held For Sale TransferOfPortfolioLoansToHeldForSale	5460000	USD
	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	-49508000	USD
	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	11476000	USD
	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	480867000	USD
	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	0	USD
	fbk	Noncash Or Part Noncash Trade Date Payable NoncashOrPartNoncashTradeDatePayable	1214000	USD
	fbk	Noncash Or Part Noncash Trade Date Payable NoncashOrPartNoncashTradeDatePayable	3671000	USD
	fbk	Noncash Or Part Noncash Trade Date Receivable NoncashOrPartNoncashTradeDateReceivable	0	USD
	fbk	Noncash Or Part Noncash Trade Date Receivable NoncashOrPartNoncashTradeDateReceivable	0	USD
CY2020Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	139000	USD
CY2019Q3	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	168000	USD
	fbk	Non Cash Transaction Due To Adoption Of Recognition And Measurement Of Financial Assets And Liabilities NonCashTransactionDueToAdoptionOfRecognitionAndMeasurementOfFinancialAssetsAndLiabilities	25018000	USD
	fbk	Non Cash Transaction Due To Adoption Of Recognition And Measurement Of Financial Assets And Liabilities NonCashTransactionDueToAdoptionOfRecognitionAndMeasurementOfFinancialAssetsAndLiabilities	1309000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	806000	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	39011000	USD
CY2020Q3	fbk	Number Of Full Service Branches NumberOfFullServiceBranches	87	branch
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-5599000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	23966000	USD
	us-gaap	Net Income Loss NetIncomeLoss	18019000	USD
	us-gaap	Net Income Loss NetIncomeLoss	62242000	USD
CY2020Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	0	USD
CY2019Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	128000	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	333000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-5599000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	23838000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	18019000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	61909000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40154841	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	30899583	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	34404064	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	30849035	shares
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.14
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.77
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.01
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-5599000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	23838000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	18019000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	61909000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	40154841	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	30899583	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	34404064	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	30849035	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Contingently Issuable WeightedAverageNumberOfSharesContingentlyIssuable	482904	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Contingently Issuable WeightedAverageNumberOfSharesContingentlyIssuable	525990	shares
	us-gaap	Weighted Average Number Of Shares Contingently Issuable WeightedAverageNumberOfSharesContingentlyIssuable	436228	shares
	us-gaap	Weighted Average Number Of Shares Contingently Issuable WeightedAverageNumberOfSharesContingentlyIssuable	529751	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	40637745	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	31425573	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	34840292	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	31378786	shares
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.14
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.76
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.97
CY2020Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	332347	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	536908	shares
CY2020Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	4409642000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	31139000	USD
CY2020Q1	fbk	Financing Receivable Allowancefor Credit Loss Unfunded Commitments FinancingReceivableAllowanceforCreditLossUnfundedCommitments	0	USD
CY2020Q1	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	20490000	USD
CY2020Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	293524000	USD
CY2020Q3	fbk	Business Combination Consideration Transferred Shares Outstanding BusinessCombinationConsiderationTransferredSharesOutstanding	15651243	shares
CY2020Q3	fbk	Financing Receivable Deterioration Credit Quality Since Origination FinancingReceivableDeteriorationCreditQualitySinceOrigination	0.282
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
CY2019Q3	fbk	Business Acquisition Pro Forma Interest Income Net BusinessAcquisitionProFormaInterestIncomeNet	90195000	USD
CY2019Q3	fbk	Business Acquisition Pro Forma Interest Income Net BusinessAcquisitionProFormaInterestIncomeNet	90195000	USD
	fbk	Business Acquisition Pro Forma Interest Income Net BusinessAcquisitionProFormaInterestIncomeNet	252849000	USD
	fbk	Business Acquisition Pro Forma Interest Income Net BusinessAcquisitionProFormaInterestIncomeNet	252849000	USD
	fbk	Business Acquisition Pro Forma Interest Income Net BusinessAcquisitionProFormaInterestIncomeNet	260353000	USD
	fbk	Business Acquisition Pro Forma Interest Income Net BusinessAcquisitionProFormaInterestIncomeNet	260353000	USD
CY2020Q3	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	71214000	USD
CY2020Q3	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	71214000	USD
CY2019Q3	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	126918000	USD
CY2019Q3	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	126918000	USD
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	272375000	USD
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	272375000	USD
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	343425000	USD
	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	343425000	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
CY2019Q3	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	36723000	USD
CY2019Q3	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	36723000	USD
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	19526000	USD
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	19526000	USD
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	83072000	USD
	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	83072000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1129053000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	32503000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1035000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1160521000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	676705000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	13567000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1891000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	688381000	USD
CY2020Q3	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	4389000	USD
CY2019Q4	us-gaap	Equity Securities Fv Ni EquitySecuritiesFvNi	3295000	USD
	fbk	Noncash Or Part Noncash Trade Date Payable NoncashOrPartNoncashTradeDatePayable	1214000	USD
CY2019	fbk	Noncash Or Part Noncash Trade Date Payable NoncashOrPartNoncashTradeDatePayable	0	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	18861000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	19009000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1148000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	1152000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	29353000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	29811000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	11553000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	11676000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	30513000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	31676000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	18287000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	18887000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	306515000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	320065000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	158616000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	165990000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	385242000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	400561000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	189604000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	197705000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1129053000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1160521000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	676705000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	688381000	USD
CY2020Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	28257000	USD
CY2019Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	22740000	USD
	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	24498000	USD
CY2020Q3	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	67886000	USD
CY2019Q3	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	28694000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	140246000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	78861000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	563000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	1000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	563000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	7000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	39000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	76000	USD
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	39000	USD
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	83000	USD
CY2020Q3	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	59000	USD
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	94000	USD
CY2019Q3	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	55000	USD
	us-gaap	Equity Securities Fv Ni Gain Loss EquitySecuritiesFvNiGainLoss	151000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	167138000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	1035000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	0	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	0	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	167138000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1035000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	63074000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	394000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	175730000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	1497000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	238804000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1891000	USD
CY2020Q3	fbk	Number Of Available For Sale Securities In Portfolio NumberOfAvailableForSaleSecuritiesInPortfolio	553	security
CY2019Q4	fbk	Number Of Available For Sale Securities In Portfolio NumberOfAvailableForSaleSecuritiesInPortfolio	365	security
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	33	security
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	58	security
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
	fbk	Provisionfor Credit Losseson Availablefor Sale Debt Securities ProvisionforCreditLossesonAvailableforSaleDebtSecurities	0	USD
CY2020Q3	fbk	Provisionfor Credit Losseson Availablefor Sale Debt Securities ProvisionforCreditLossesonAvailableforSaleDebtSecurities	0	USD
CY2019Q3	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2020Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	7213538000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	4409642000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	183973000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	31139000	USD
CY2020Q3	us-gaap	Notes Receivable Net NotesReceivableNet	7029565000	USD
CY2019Q4	us-gaap	Notes Receivable Net NotesReceivableNet	4378503000	USD
CY2020Q3	fbk	Loans Processed Value Cares Act LoansProcessedValueCARESAct	310719000	USD
CY2020Q3	fbk	Financing Receivable Accrued Interest Receivable FinancingReceivableAccruedInterestReceivable	41797000	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	113129000	USD
CY2020Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	45834000	USD
CY2020Q3	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	1172000	USD
CY2020Q3	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	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 Losses FinancingReceivableAllowanceForCreditLosses	183973000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	31139000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	97837000	USD
	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	2620000	USD
	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	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 Losses FinancingReceivableAllowanceForCreditLosses	183973000	USD
CY2019Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	30138000	USD
CY2019Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1831000	USD
CY2019Q3	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	212000	USD
CY2019Q3	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	717000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	31464000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	28932000	USD
	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	4103000	USD
	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	787000	USD
	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	2358000	USD
CY2019Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	31464000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	895000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	28571000	USD
CY2019Q4	us-gaap	Certain Loans And Debt Securities Acquired In Transfer Allowance For Credit Losses Due To Subsequent Impairment CertainLoansAndDebtSecuritiesAcquiredInTransferAllowanceForCreditLossesDueToSubsequentImpairment	1673000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	31139000	USD
CY2019Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	23810000	USD
CY2019Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	4328680000	USD
CY2019Q4	us-gaap	Certain Loans Acquired In Transfer Accounted For As Debt Securities Acquired During Period At Acquisition At Fair Value CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue	57152000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	4409642000	USD
CY2020Q3	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	1251350000	USD
CY2020Q3	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	1363764000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	961417000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	768142000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	680590000	USD
CY2020Q3	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	968015000	USD
CY2020Q3	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	1220260000	USD
CY2020Q3	fbk	Financing Receivable Originatedand Revolving FinancingReceivableOriginatedandRevolving	7213538000	USD
CY2019Q4	fbk	Financing Receivable Gross Exclude Loans Acquired With Deteriorated Credit Quality FinancingReceivableGrossExcludeLoansAcquiredWithDeterioratedCreditQuality	4352490000	USD
CY2019Q4	us-gaap	Certain Loans Acquired In Transfer Accounted For As Debt Securities Acquired During Period At Acquisition At Fair Value CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue	57152000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	4409642000	USD
CY2020Q3	us-gaap	Notes Receivable Gross NotesReceivableGross	7213538000	USD
CY2019Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	4409642000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	14126000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	16881000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	895000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	9684000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	11759000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	23810000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	28640000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	895000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	10148000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeCashBasisMethod	113000	USD
	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	8865000	USD
	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeCashBasisMethod	288000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	6828000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisMethod	168000	USD
	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	7129000	USD
	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisMethod	338000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	16976000	USD
CY2019Q3	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	281000	USD
	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	15994000	USD
	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	626000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	16681000	USD
CY2020Q3	fbk	Financing Receivable Modifications Recorded Investment Specific Reserves FinancingReceivableModificationsRecordedInvestmentSpecificReserves	854000	USD
CY2019Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	12206000	USD
CY2019Q4	fbk	Financing Receivable Modifications Recorded Investment Specific Reserves FinancingReceivableModificationsRecordedInvestmentSpecificReserves	360000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	2	loan
CY2020Q3	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	12243000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	5201000	USD
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
CY2019Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	5	loan
CY2019Q3	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	3507000	USD
CY2019Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	3507000	USD
CY2019Q3	fbk	Financing Receivable Modifications Charge Offs And Specific Reserves FinancingReceivableModificationsChargeOffsAndSpecificReserves	106000	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
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	7	loan
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	6695000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	6695000	USD
	fbk	Financing Receivable Modifications Charge Offs And Specific Reserves FinancingReceivableModificationsChargeOffsAndSpecificReserves	106000	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
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	USD
CY2019Q3	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	USD
	fbk	Financing Receivable Individually Assessed Allowance For Credit Loss FinancingReceivableIndividuallyAssessedAllowanceForCreditLoss	2291000	USD
CY2020Q1	fbk	Financing Receivable Classification Of Troubled Debt Restructures Exemption Period Caresact FinancingReceivableClassificationOfTroubledDebtRestructuresExemptionPeriodCARESACT	P60D
CY2020Q3	fbk	Deferred Loans That Were Transfered To Normal Payment Status Value Cares Act DeferredLoansThatWereTransferedToNormalPaymentStatusValueCARESAct	1181232000	USD
CY2020Q3	fbk	Financing Receivable Outstanding Loans Balance Caresact FinancingReceivableOutstandingLoansBalanceCARESACT	464832000	USD
CY2020Q3	fbk	Financing Receivable Percent Of Loans Held For Investment Caresact FinancingReceivablePercentOfLoansHeldForInvestmentCARESACT	0.064
CY2020Q3	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	851951000	USD
CY2019Q4	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	262518000	USD
CY2020Q2	us-gaap	Foreclosed Assets ForeclosedAssets	15091000	USD
CY2019Q2	us-gaap	Foreclosed Assets ForeclosedAssets	15521000	USD
CY2019Q4	us-gaap	Foreclosed Assets ForeclosedAssets	18939000	USD
CY2018Q4	us-gaap	Foreclosed Assets ForeclosedAssets	12643000	USD
CY2020Q3	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	573000	USD
CY2019Q3	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1535000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	1579000	USD
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	3565000	USD
CY2020Q3	fbk	Property Plant And Equipment Transfers To And From PropertyPlantAndEquipmentTransfersToAndFrom	0	USD
CY2019Q3	fbk	Property Plant And Equipment Transfers To And From PropertyPlantAndEquipmentTransfersToAndFrom	0	USD
	fbk	Property Plant And Equipment Transfers To And From PropertyPlantAndEquipmentTransfersToAndFrom	-841000	USD
	fbk	Property Plant And Equipment Transfers To And From PropertyPlantAndEquipmentTransfersToAndFrom	2640000	USD
CY2020Q3	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	1411000	USD
CY2019Q3	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	854000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	5561000	USD
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	2718000	USD
CY2020Q3	fbk	Gain Loss On Sale Of Foreclosed Real Estate Assets. GainLossOnSaleOfForeclosedRealEstateAssets.	119000	USD
CY2019Q3	fbk	Gain Loss On Sale Of Foreclosed Real Estate Assets. GainLossOnSaleOfForeclosedRealEstateAssets.	260000	USD
	fbk	Gain Loss On Sale Of Foreclosed Real Estate Assets. GainLossOnSaleOfForeclosedRealEstateAssets.	464000	USD
	fbk	Gain Loss On Sale Of Foreclosed Real Estate Assets. GainLossOnSaleOfForeclosedRealEstateAssets.	582000	USD
CY2020Q3	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	0	USD
CY2019Q3	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	0	USD
	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	0	USD
	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	166000	USD
CY2020Q3	fbk	Foreclosed Real Estate Expense Write Downs And Liquidations ForeclosedRealEstateExpenseWriteDownsAndLiquidations	1624000	USD
CY2019Q3	fbk	Foreclosed Real Estate Expense Write Downs And Liquidations ForeclosedRealEstateExpenseWriteDownsAndLiquidations	386000	USD
	fbk	Foreclosed Real Estate Expense Write Downs And Liquidations ForeclosedRealEstateExpenseWriteDownsAndLiquidations	1832000	USD
	fbk	Foreclosed Real Estate Expense Write Downs And Liquidations ForeclosedRealEstateExpenseWriteDownsAndLiquidations	470000	USD
CY2020Q3	us-gaap	Foreclosed Assets ForeclosedAssets	12748000	USD
CY2019Q3	us-gaap	Foreclosed Assets ForeclosedAssets	16076000	USD
CY2020Q3	us-gaap	Foreclosed Assets ForeclosedAssets	12748000	USD
CY2019Q3	us-gaap	Foreclosed Assets ForeclosedAssets	16076000	USD
	us-gaap	Payments To Acquire Held For Sale Real Estate PaymentsToAcquireHeldForSaleRealEstate	6178000	USD
CY2020Q1	us-gaap	Payments To Acquire Held For Sale Real Estate PaymentsToAcquireHeldForSaleRealEstate	8956000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	169051000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	236086000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	62523000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	38599000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	23924000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	52363000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	34774000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	17589000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	1494000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	5477000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	4586000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	3658000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	2946000	USD
CY2020Q3	fbk	Finite Lived Intangible Asset Expected Amortization After Year Four FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour	5763000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	23924000	USD
CY2020Q3	fbk	Lessee Number Of Operating Leases LesseeNumberOfOperatingLeases	60	operatingLease
CY2020Q3	fbk	Lessee Number Of Finance Leases LesseeNumberOfFinanceLeases	1	branch
CY2020Q3	fbk	Lessee Number Of Total Operating Leases Noncurrent LesseeNumberOfTotalOperatingLeasesNoncurrent	54	operatingLease
CY2020Q3	fbk	Lessee Number Of Total Finance Leases Noncurrent LesseeNumberOfTotalFinanceLeasesNoncurrent	1	branch
CY2020Q3	fbk	Lessee Operating And Finance Lease Number Of Options To Renew LesseeOperatingAndFinanceLeaseNumberOfOptionsToRenew	1	lease_renew_option
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	52410000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	32539000	USD
CY2020Q3	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	1616000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	0	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	56705000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	35525000	USD
CY2020Q3	us-gaap	Finance Lease Liability FinanceLeaseLiability	1619000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	0	USD
CY2020Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P12Y4M24D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P14Y1M6D
CY2020Q3	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P14Y7M6D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P0Y
CY2020Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0266
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0344
CY2020Q3	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0176
CY2020Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	1663000	USD
CY2019Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	1260000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	4341000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	3875000	USD
CY2020Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	95000	USD
CY2019Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	81000	USD
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	261000	USD
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	239000	USD
CY2020Q3	us-gaap	Variable Lease Cost VariableLeaseCost	78000	USD
CY2019Q3	us-gaap	Variable Lease Cost VariableLeaseCost	146000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	376000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	580000	USD
CY2020Q3	us-gaap	Lease Cost LeaseCost	1836000	USD
CY2019Q3	us-gaap	Lease Cost LeaseCost	1487000	USD
	us-gaap	Lease Cost LeaseCost	4978000	USD
	us-gaap	Lease Cost LeaseCost	4694000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths	7928000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Two LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo	7196000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Three LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree	6572000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Four LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour	6046000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due In Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive	5298000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Rolling Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive	35242000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	68282000	USD
CY2020Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	11577000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	56705000	USD
CY2020Q2	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	60508000	USD
CY2019Q2	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	66380000	USD
CY2019Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	75521000	USD
CY2018Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	88829000	USD
CY2020Q3	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	18202000	USD
CY2019Q3	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	10387000	USD
	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	33415000	USD
	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	30319000	USD
CY2020Q3	fbk	Servicing Asset At Amortized Cost Additions From Acquisition ServicingAssetAtAmortizedCostAdditionsFromAcquisition	4850000	USD
CY2019Q3	fbk	Servicing Asset At Amortized Cost Additions From Acquisition ServicingAssetAtAmortizedCostAdditionsFromAcquisition	0	USD
	fbk	Servicing Asset At Amortized Cost Additions From Acquisition ServicingAssetAtAmortizedCostAdditionsFromAcquisition	4850000	USD
	fbk	Servicing Asset At Amortized Cost Additions From Acquisition ServicingAssetAtAmortizedCostAdditionsFromAcquisition	0	USD
CY2020Q3	us-gaap	Servicing Asset At Amortized Value Disposals ServicingAssetAtAmortizedValueDisposals	0	USD
CY2019Q3	us-gaap	Servicing Asset At Amortized Value Disposals ServicingAssetAtAmortizedValueDisposals	0	USD
	us-gaap	Servicing Asset At Amortized Value Disposals ServicingAssetAtAmortizedValueDisposals	0	USD
	us-gaap	Servicing Asset At Amortized Value Disposals ServicingAssetAtAmortizedValueDisposals	29160000	USD
CY2020Q3	fbk	Servicing Asset At Fair Value Changes In Fair Value Due To Pay Offs Or Pay Downs ServicingAssetAtFairValueChangesInFairValueDueToPayOffsOrPayDowns	-7756000	USD
CY2019Q3	fbk	Servicing Asset At Fair Value Changes In Fair Value Due To Pay Offs Or Pay Downs ServicingAssetAtFairValueChangesInFairValueDueToPayOffsOrPayDowns	-5050000	USD
	fbk	Servicing Asset At Fair Value Changes In Fair Value Due To Pay Offs Or Pay Downs ServicingAssetAtFairValueChangesInFairValueDueToPayOffsOrPayDowns	-19676000	USD
	fbk	Servicing Asset At Fair Value Changes In Fair Value Due To Pay Offs Or Pay Downs ServicingAssetAtFairValueChangesInFairValueDueToPayOffsOrPayDowns	-10150000	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
CY2019Q3	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	-5561000	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
	us-gaap	Servicing Asset At Fair Value Changes In Fair Value Resulting From Changes In Valuation Inputs Or Changes In Assumptions ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions	-13682000	USD
CY2020Q3	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	71535000	USD
CY2019Q3	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	66156000	USD
CY2020Q3	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	71535000	USD
CY2019Q3	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	66156000	USD
CY2020Q3	us-gaap	Contractually Specified Servicing Fees Amount ContractuallySpecifiedServicingFeesAmount	5536000	USD
CY2019Q3	us-gaap	Contractually Specified Servicing Fees Amount ContractuallySpecifiedServicingFeesAmount	3960000	USD
	us-gaap	Contractually Specified Servicing Fees Amount ContractuallySpecifiedServicingFeesAmount	15667000	USD
	us-gaap	Contractually Specified Servicing Fees Amount ContractuallySpecifiedServicingFeesAmount	12763000	USD
CY2020Q3	fbk	Change In Fair Value Of Mortgage Servicing Rights ChangeInFairValueOfMortgageServicingRights	7175000	USD
CY2019Q3	fbk	Change In Fair Value Of Mortgage Servicing Rights ChangeInFairValueOfMortgageServicingRights	10611000	USD
	fbk	Change In Fair Value Of Mortgage Servicing Rights ChangeInFairValueOfMortgageServicingRights	42251000	USD
	fbk	Change In Fair Value Of Mortgage Servicing Rights ChangeInFairValueOfMortgageServicingRights	23832000	USD
CY2020Q3	fbk	Change In Fair Value Of Derivative Hedging Instruments ChangeInFairValueOfDerivativeHedgingInstruments	265000	USD
CY2019Q3	fbk	Change In Fair Value Of Derivative Hedging Instruments ChangeInFairValueOfDerivativeHedgingInstruments	-5520000	USD
	fbk	Change In Fair Value Of Derivative Hedging Instruments ChangeInFairValueOfDerivativeHedgingInstruments	-15705000	USD
	fbk	Change In Fair Value Of Derivative Hedging Instruments ChangeInFairValueOfDerivativeHedgingInstruments	-13060000	USD
CY2020Q3	fbk	Contractually Specified Servicing Fee Late Feeand Ancillary Fee Earnedin Exchangefor Servicing Financial Asset Liabilities ContractuallySpecifiedServicingFeeLateFeeandAncillaryFeeEarnedinExchangeforServicingFinancialAssetLiabilities	-1904000	USD
CY2019Q3	fbk	Contractually Specified Servicing Fee Late Feeand Ancillary Fee Earnedin Exchangefor Servicing Financial Asset Liabilities ContractuallySpecifiedServicingFeeLateFeeandAncillaryFeeEarnedinExchangeforServicingFinancialAssetLiabilities	-1131000	USD
	fbk	Contractually Specified Servicing Fee Late Feeand Ancillary Fee Earnedin Exchangefor Servicing Financial Asset Liabilities ContractuallySpecifiedServicingFeeLateFeeandAncillaryFeeEarnedinExchangeforServicingFinancialAssetLiabilities	-10879000	USD
	fbk	Contractually Specified Servicing Fee Late Feeand Ancillary Fee Earnedin Exchangefor Servicing Financial Asset Liabilities ContractuallySpecifiedServicingFeeLateFeeandAncillaryFeeEarnedinExchangeforServicingFinancialAssetLiabilities	1991000	USD
CY2020Q3	fbk	Gross Servicing Expense GrossServicingExpense	1999000	USD
CY2019Q3	fbk	Gross Servicing Expense GrossServicingExpense	1732000	USD
	fbk	Gross Servicing Expense GrossServicingExpense	5392000	USD
	fbk	Gross Servicing Expense GrossServicingExpense	4961000	USD
CY2020Q3	fbk	Servicing Income Loss ServicingIncomeLoss	-3903000	USD
CY2019Q3	fbk	Servicing Income Loss ServicingIncomeLoss	-2863000	USD
	fbk	Servicing Income Loss ServicingIncomeLoss	-16271000	USD
	fbk	Servicing Income Loss ServicingIncomeLoss	-2970000	USD
CY2020Q3	us-gaap	Continuing Involvement With Transferred Financial Assets Principal Amount Outstanding ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding	9101007000	USD
CY2019Q4	us-gaap	Continuing Involvement With Transferred Financial Assets Principal Amount Outstanding ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding	6734496000	USD
	us-gaap	Assumption For Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Prepayment Speed AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed	0.1528
CY2019	us-gaap	Assumption For Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Prepayment Speed AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed	0.1005
CY2020Q3	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	4214000	USD
CY2019Q4	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	2839000	USD
CY2020Q3	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	8053000	USD
CY2019Q4	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	5474000	USD
	us-gaap	Assumption For Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Discount Rate AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesDiscountRate	0.1127
CY2019	us-gaap	Assumption For Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Discount Rate AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesDiscountRate	0.0968
CY2020Q3	fbk	Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of One Percent Adverse Change In Discount Rate SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOnePercentAdverseChangeInDiscountRate	2570000	USD
CY2019Q4	fbk	Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of One Percent Adverse Change In Discount Rate SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfOnePercentAdverseChangeInDiscountRate	3086000	USD
CY2020Q3	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	4960000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	304675000	USD
CY2020Q3	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	2079975000	USD
CY2019Q4	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	5932000	USD
	fbk	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Coupon Interest Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageCouponInterestRate	0.0375
CY2019	fbk	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Coupon Interest Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageCouponInterestRate	0.0420
	fbk	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Servicing Fee ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageServicingFee	0.0028
CY2019	fbk	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Servicing Fee ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageServicingFee	0.0029
	us-gaap	Assumption For Fair Value Of Assets Or Liabilities That Relate To Transferors Continuing Involvement Weighted Average Life1 AssumptionForFairValueOfAssetsOrLiabilitiesThatRelateToTransferorsContinuingInvolvementWeightedAverageLife1	P328M
CY2019	us-gaap	Assumption For Fair Value Of Assets Or Liabilities That Relate To Transferors Continuing Involvement Weighted Average Life1 AssumptionForFairValueOfAssetsOrLiabilitiesThatRelateToTransferorsContinuingInvolvementWeightedAverageLife1	P335M
	us-gaap	Servicing Asset At Amortized Value Disposals ServicingAssetAtAmortizedValueDisposals	29160000	USD
CY2019Q3	fbk	Mortgage Loans Serviced MortgageLoansServiced	2034374000	USD
CY2020Q3	us-gaap	Escrow Deposit EscrowDeposit	194276000	USD
CY2019Q4	us-gaap	Escrow Deposit EscrowDeposit	92610000	USD
CY2020Q3	us-gaap	Long Term Debt LongTermDebt	438838000	USD
CY2019Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	9167000	USD
CY2020Q3	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-15163000	USD
CY2020Q3	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds	1604499000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	958506000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds	760607000	USD
CY2020Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	145000000	USD
CY2019Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	75000000	USD
CY2020Q3	us-gaap	Federal Home Loan Bank Advances Branch Of Fhlb Bank Amount Of Advances By Branch FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch	200000000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances Branch Of Fhlb Bank Amount Of Advances By Branch FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch	250000000	USD
	fbk	Federal Home Loan Bank Advances Option Cancellation Term FederalHomeLoanBankAdvancesOptionCancellationTerm	P1Y
	fbk	Debt Period For Loss Of Tier2 Capital Treatment DebtPeriodForLossOfTier2CapitalTreatment	P5Y
CY2020Q3	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	13123000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7718000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	37038000	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	25907000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-31543000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5900000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5495000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20007000	USD
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
CY2019Q3	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	6653000	USD
CY2019Q3	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
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
CY2019Q3	fbk	Income Tax Reconciliation Change In State Taxes Net Of Federal Benefit IncomeTaxReconciliationChangeInStateTaxesNetOfFederalBenefit	1512000	USD
CY2019Q3	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.047
CY2020Q3	fbk	Income Tax Reconciliation Nondeductible Income Share Based Compensation Cost IncomeTaxReconciliationNondeductibleIncomeShareBasedCompensationCost	7000	USD
CY2019Q3	fbk	Income Tax Reconciliation Nondeductible Income Share Based Compensation Cost IncomeTaxReconciliationNondeductibleIncomeShareBasedCompensationCost	275000	USD
CY2019Q3	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.009
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
CY2019Q3	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.002
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2040000	USD
CY2019Q3	fbk	Income Tax Reconciliation Permanent Items IncomeTaxReconciliationPermanentItems	-211000	USD
CY2019Q3	fbk	Effective Income Tax Rate Reconciliation Municipal Interest Income Net Of Interest Disallowance Percent EffectiveIncomeTaxRateReconciliationMunicipalInterestIncomeNetOfInterestDisallowancePercent	-0.007
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
CY2019Q3	fbk	Income Tax Reconciliation Bank Owned Life Insurance IncomeTaxReconciliationBankOwnedLifeInsurance	11000	USD
CY2019Q3	fbk	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Percent EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsurancePercent	-0.001
CY2020Q3	fbk	Income Tax Reconciliation Change In Merger Costs IncomeTaxReconciliationChangeInMergerCosts	126000	USD
CY2020Q3	fbk	Effective Income Tax Rate Reconciliation Nondeductible Expense Merger Costs EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMergerCosts	-0.016
CY2019Q3	fbk	Income Tax Reconciliation Change In Merger Costs IncomeTaxReconciliationChangeInMergerCosts	0	USD
CY2019Q3	fbk	Effective Income Tax Rate Reconciliation Nondeductible Expense Merger Costs EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMergerCosts	0
CY2020Q3	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-177000	USD
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.023
CY2019Q3	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	50000	USD
CY2020Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.267
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7718000	USD
CY2019Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.244
	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
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	17272000	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	1266000	USD
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.054
	fbk	Income Tax Reconciliation Change In State Taxes Net Of Federal Benefit IncomeTaxReconciliationChangeInStateTaxesNetOfFederalBenefit	3855000	USD
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.047
	fbk	Income Tax Reconciliation Nondeductible Income Share Based Compensation Cost IncomeTaxReconciliationNondeductibleIncomeShareBasedCompensationCost	-154000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.007
	fbk	Income Tax Reconciliation Nondeductible Income Share Based Compensation Cost IncomeTaxReconciliationNondeductibleIncomeShareBasedCompensationCost	668000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.008
	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 Permanent Items IncomeTaxReconciliationPermanentItems	-650000	USD
	fbk	Effective Income Tax Rate Reconciliation Municipal Interest Income Net Of Interest Disallowance Percent EffectiveIncomeTaxRateReconciliationMunicipalInterestIncomeNetOfInterestDisallowancePercent	-0.008
	fbk	Income Tax Reconciliation Bank Owned Life Insurance IncomeTaxReconciliationBankOwnedLifeInsurance	90000	USD
	fbk	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Percent EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsurancePercent	0.004
	fbk	Income Tax Reconciliation Bank Owned Life Insurance IncomeTaxReconciliationBankOwnedLifeInsurance	38000	USD
	fbk	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Percent EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsurancePercent	-0.001
	fbk	Income Tax Reconciliation Change In Merger Costs IncomeTaxReconciliationChangeInMergerCosts	289000	USD
	fbk	Effective Income Tax Rate Reconciliation Nondeductible Expense Merger Costs EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMergerCosts	0.012
	fbk	Income Tax Reconciliation Change In Merger Costs IncomeTaxReconciliationChangeInMergerCosts	0	USD
	fbk	Effective Income Tax Rate Reconciliation Nondeductible Expense Merger Costs EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMergerCosts	0
	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-65000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	-0.003
	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	236000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Other Reconciling Items Percent EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent	0.003
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5495000	USD
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.234
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20007000	USD
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.243
CY2020Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	51869000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	8113000	USD
CY2020Q3	fbk	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	14892000	USD
CY2019Q4	fbk	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	9373000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	1753000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	0	USD
CY2020Q3	fbk	Deferred Tax Assets Amortization Of Core Deposit Intangible DeferredTaxAssetsAmortizationOfCoreDepositIntangible	0	USD
CY2019Q4	fbk	Deferred Tax Assets Amortization Of Core Deposit Intangible DeferredTaxAssetsAmortizationOfCoreDepositIntangible	1386000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	8250000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	5231000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	54000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Unrealized Losses On Trading Securities DeferredTaxAssetsUnrealizedLossesOnTradingSecurities	41000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Trading Securities DeferredTaxAssetsUnrealizedLossesOnTradingSecurities	60000	USD
CY2020Q3	fbk	Deferred Tax Assets Unrealized Losseson Cash Flow Hedges DeferredTaxAssetsUnrealizedLossesonCashFlowHedges	347000	USD
CY2019Q4	fbk	Deferred Tax Assets Unrealized Losseson Cash Flow Hedges DeferredTaxAssetsUnrealizedLossesonCashFlowHedges	0	USD
CY2020Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	6684000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2388000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	83836000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	26605000	USD
CY2020Q3	fbk	Deferred Tax Liabilities Federal Home Loan Bank Stock Dividends DeferredTaxLiabilitiesFederalHomeLoanBankStockDividends	561000	USD
CY2019Q4	fbk	Deferred Tax Liabilities Federal Home Loan Bank Stock Dividends DeferredTaxLiabilitiesFederalHomeLoanBankStockDividends	550000	USD
CY2020Q3	fbk	Deferred Tax Liabilities Operating Lease Rightof Use Asset DeferredTaxLiabilitiesOperatingLeaseRightofUseAsset	13863000	USD
CY2019Q4	fbk	Deferred Tax Liabilities Operating Lease Rightof Use Asset DeferredTaxLiabilitiesOperatingLeaseRightofUseAsset	8641000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	5689000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	5078000	USD
CY2020Q3	fbk	Deferred Tax Liabilities Amortization Of Intangibles DeferredTaxLiabilitiesAmortizationOfIntangibles	668000	USD
CY2019Q4	fbk	Deferred Tax Liabilities Amortization Of Intangibles DeferredTaxLiabilitiesAmortizationOfIntangibles	0	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	203000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Unrealized Gains On Trading Securities DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities	12116000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Unrealized Gains On Trading Securities DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities	3051000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	18557000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	19678000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	10691000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	8859000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	-200000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1035000	USD
CY2020Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	61945000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	47095000	USD
CY2020Q3	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	21891000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	20490000	USD
CY2020Q3	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	1837309000	USD
CY2019Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Face Amount Liability FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	1105742000	USD
CY2020Q3	fbk	Principal Amount Of Loans Repurchased Or Indemnified During Period PrincipalAmountOfLoansRepurchasedOrIndemnifiedDuringPeriod	1329000	USD
	fbk	Principal Amount Of Loans Repurchased Or Indemnified During Period PrincipalAmountOfLoansRepurchasedOrIndemnifiedDuringPeriod	5696000	USD
CY2019Q3	fbk	Principal Amount Of Loans Repurchased Or Indemnified During Period PrincipalAmountOfLoansRepurchasedOrIndemnifiedDuringPeriod	1165000	USD
	fbk	Principal Amount Of Loans Repurchased Or Indemnified During Period PrincipalAmountOfLoansRepurchasedOrIndemnifiedDuringPeriod	4675000	USD
CY2020Q2	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	4601000	USD
CY2019Q2	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	3407000	USD
CY2019Q4	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	3529000	USD
CY2018Q4	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	3273000	USD
CY2020Q3	fbk	Provision For Mortgage Loan Repurchases Or Indemnifications ProvisionForMortgageLoanRepurchasesOrIndemnifications	901000	USD
CY2019Q3	fbk	Provision For Mortgage Loan Repurchases Or Indemnifications ProvisionForMortgageLoanRepurchasesOrIndemnifications	107000	USD
	fbk	Provision For Mortgage Loan Repurchases Or Indemnifications ProvisionForMortgageLoanRepurchasesOrIndemnifications	2128000	USD
	fbk	Provision For Mortgage Loan Repurchases Or Indemnifications ProvisionForMortgageLoanRepurchasesOrIndemnifications	255000	USD
CY2020Q3	fbk	Allowance For Loan Repurchases Or Indemnifications Recoveries On Previous Losses AllowanceForLoanRepurchasesOrIndemnificationsRecoveriesOnPreviousLosses	44000	USD
CY2019Q3	fbk	Allowance For Loan Repurchases Or Indemnifications Recoveries On Previous Losses AllowanceForLoanRepurchasesOrIndemnificationsRecoveriesOnPreviousLosses	79000	USD
	fbk	Allowance For Loan Repurchases Or Indemnifications Recoveries On Previous Losses AllowanceForLoanRepurchasesOrIndemnificationsRecoveriesOnPreviousLosses	199000	USD
	fbk	Allowance For Loan Repurchases Or Indemnifications Recoveries On Previous Losses AllowanceForLoanRepurchasesOrIndemnificationsRecoveriesOnPreviousLosses	93000	USD
CY2020Q3	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	5458000	USD
CY2019Q3	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	3435000	USD
CY2020Q3	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	5458000	USD
CY2019Q3	fbk	Allowance For Loan Repurchases Or Indemnifications AllowanceForLoanRepurchasesOrIndemnifications	3435000	USD
CY2017Q3	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	100000000	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	4328000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	331000	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	39298000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	14682000	USD
CY2020Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	0	USD
CY2019Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	0	USD
CY2020Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	0	USD
CY2019Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	0	USD
CY2020Q3	us-gaap	Derivative Assets DerivativeAssets	4328000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	331000	USD
CY2020Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	39298000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	14682000	USD
CY2020Q3	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	974000	USD
CY2019Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	139000	USD
CY2020Q3	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	974000	USD
CY2019Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	139000	USD
CY2020Q3	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	0	USD
CY2019Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	0	USD
CY2020Q3	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	38324000	USD
CY2019Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	14543000	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	3354000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	192000	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	0	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	0	USD
CY2020Q3	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	76063000	USD
CY2019Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	33616000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-41000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-46000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-145000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	-121000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	40000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-90000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-403000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-407000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	112000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-256000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-1145000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-1151000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-2040000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-5599000	USD
CY2020Q3	us-gaap	Assets Assets	11010438000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	236086000	USD
CY2020Q3	fbk	Provisionfor Credit Losses On Unfunded Commitments ProvisionforCreditLossesOnUnfundedCommitments	9567000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2020Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	68828000	USD
CY2020Q3	fbk	Provisionfor Loanand Lease Losses Net ProvisionforLoanandLeaseLossesNet	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	1693000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1417000	USD
CY2020Q3	fbk	Other Noninterest Mortgage Banking Expense OtherNoninterestMortgageBankingExpense	45084000	USD
CY2020Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	69898000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-7639000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	58305000	USD
CY2019Q3	fbk	Provisionfor Loanand Lease Losses Net ProvisionforLoanandLeaseLossesNet	1831000	USD
CY2019Q3	fbk	Fees And Commissions Mortgage Banking Before Adjustments FeesAndCommissionsMortgageBankingBeforeAdjustments	34284000	USD
CY2019Q3	fbk	Change In Fair Value Of Mortgage Servicing Rights And Hedging Instruments ChangeInFairValueOfMortgageServicingRightsAndHedgingInstruments	5091000	USD
CY2019Q3	us-gaap	Noninterest Income Other NoninterestIncomeOther	8952000	USD
CY2019Q3	us-gaap	Depreciation And Amortization DepreciationAndAmortization	1380000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1197000	USD
CY2019Q3	fbk	Other Noninterest Mortgage Banking Expense OtherNoninterestMortgageBankingExpense	23648000	USD
CY2019Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	36710000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	31684000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7718000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	23966000	USD
CY2019Q3	us-gaap	Assets Assets	6088895000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	168486000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	180414000	USD
	fbk	Provisionfor Loanand Lease Losses Net ProvisionforLoanandLeaseLossesNet	110887000	USD
	fbk	Change In Fair Value Of Mortgage Servicing Rights And Hedging Instruments ChangeInFairValueOfMortgageServicingRightsAndHedgingInstruments	26546000	USD
	us-gaap	Noninterest Income Other NoninterestIncomeOther	31618000	USD
	fbk	Fees And Commissions Mortgage Banking Before Adjustments FeesAndCommissionsMortgageBankingBeforeAdjustments	216145000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	4924000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3825000	USD
	fbk	Other Noninterest Mortgage Banking Expense OtherNoninterestMortgageBankingExpense	108129000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	150352000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	23514000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5495000	USD
	us-gaap	Net Income Loss NetIncomeLoss	18019000	USD
CY2020Q3	us-gaap	Assets Assets	11010438000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	236086000	USD
	fbk	Provisionfor Credit Losses On Unfunded Commitments ProvisionforCreditLossesOnUnfundedCommitments	13050000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	168344000	USD
	fbk	Provisionfor Loanand Lease Losses Net ProvisionforLoanandLeaseLossesNet	4103000	USD
	fbk	Fees And Commissions Mortgage Banking Before Adjustments FeesAndCommissionsMortgageBankingBeforeAdjustments	85512000	USD
	fbk	Change In Fair Value Of Mortgage Servicing Rights And Hedging Instruments ChangeInFairValueOfMortgageServicingRightsAndHedgingInstruments	10772000	USD
	us-gaap	Noninterest Income Other NoninterestIncomeOther	25423000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	3830000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3180000	USD
	fbk	Other Noninterest Mortgage Banking Expense OtherNoninterestMortgageBankingExpense	65698000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	109447000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	82249000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20007000	USD
	us-gaap	Net Income Loss NetIncomeLoss	62242000	USD
CY2019Q3	us-gaap	Assets Assets	6088895000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	168486000	USD
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	4699000	USD
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Award Vesting Rights Percentage SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage	1.81
	fbk	Share Based Compensation Arrangement By Share Based Payment Award Maximum Purchase Of Common Stock Value Per Employee ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumPurchaseOfCommonStockValuePerEmployee	25000	USD
	fbk	Financing Receivable Related Parties Additions FinancingReceivableRelatedPartiesAdditions	5870000	USD
CY2019Q4	fbk	Financing Receivable Related Parties FinancingReceivableRelatedParties	30880000	USD
	fbk	Financing Receivable Related Parties Changes In Related Party Status FinancingReceivableRelatedPartiesChangesInRelatedPartyStatus	4167000	USD
	fbk	Financing Receivable Related Parties Proceeds FinancingReceivableRelatedPartiesProceeds	8200000	USD
CY2020Q3	fbk	Financing Receivable Related Parties FinancingReceivableRelatedParties	32717000	USD
CY2020Q3	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	268179000	USD
CY2019Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	238781000	USD

Files In Submission

Name	View Source	Status
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2020 Q3 Form 10-Q Financial Statement

#000164974920000194 Filed on November 06, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FBK FB Financial Corp Stock $fbk

2020 Q3 Form 10-Q Financial Statement

#000164974920000194 Filed on November 06, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FBK
FB Financial Corp Stock $fbk