FB Financial (FBK) 10-K 12 Mar 21 2020 FY Annual report Financial data

Cover

Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Mar. 05, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-37875
Entity Registrant Name	FB FINANCIAL CORPORATION
Entity Incorporation, State or Country Code	TN
Entity Tax Identification Number	62-1216058
Entity Address, Address Line One	211 Commerce Street
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	Nashville
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	37201
City Area Code	615
Local Phone Number	564-1212
Title of 12(b) Security	Common Stock, Par Value $1.00 Per Share
Trading Symbol	FBK
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 445.7
Entity Common Stock, Shares Outstanding (in shares)		47,307,688
Documents Incorporated by Reference	Portions of the Registrant’s Definitive Proxy Statement relating to the Annual Meeting of Shareholders, which will be filed within 120 days after December 31, 2019, are incorporated by reference into Part III of this Annual Report on Form 10-K.
Entity Central Index Key	0001649749
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY

Consolidated balance sheets

Consolidated balance sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 110,991	$ 48,806
Federal funds sold	121,153	131,119
Interest-bearing deposits in financial institutions	1,085,754	52,756
Cash and cash equivalents	1,317,898	232,681
Investments:
Available-for-sale debt securities, at fair value	1,172,400	688,381
Equity securities, at fair value	4,591	3,295
Federal Home Loan Bank stock, at cost	31,232	15,976
Loans held for sale, at fair value	899,173	262,518
Loans	7,082,959	4,409,642
Less: allowance for credit losses	170,389	31,139
Net loans	6,912,570	4,378,503
Premises and equipment, net	145,115	90,131
Other real estate owned, net	12,111	18,939
Operating lease right-of-use assets	49,537	32,539
Interest receivable	43,603	17,083
Mortgage servicing rights, at fair value	79,997	75,521
Goodwill	242,561	169,051
Core deposit and other intangibles, net	22,426	17,589
Other assets	274,116	122,714
Total assets	11,207,330	6,124,921
Deposits
Noninterest-bearing	2,274,103	1,208,175
Interest-bearing checking	2,491,765	1,014,875
Money market and savings	3,254,915	1,520,035
Customer time deposits	1,375,695	1,171,502
Brokered and internet time deposits	61,559	20,351
Total deposits	9,458,037	4,934,938
Borrowings	238,324	304,675
Operating lease liabilities	55,187	35,525
Accrued expenses and other liabilities	164,400	87,454
Total liabilities	9,915,948	5,362,592
Commitments and contingencies (Note 17)
SHAREHOLDERS' EQUITY
Common stock, $1 par value per share; 75,000,000 shares authorized; 47,220,743 and 31,034,315 shares issued and outstanding at December 31, 2020 and December 31, 2019, respectively	47,222	31,034
Additional paid-in capital	898,847	425,633
Retained earnings	317,625	293,524
Accumulated other comprehensive income, net	27,595	12,138
Total FB Financial Corporation shareholders' equity	1,291,289	762,329
Noncontrolling interest	93	0
Total equity	1,291,382	762,329
Total liabilities and shareholders' equity	$ 11,207,330	$ 6,124,921

Consolidated balance sheets (Pa

Consolidated balance sheets (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	47,220,743	31,034,315
Common stock, shares outstanding (in shares)	47,220,743	31,034,315

Consolidated statements of inco

Consolidated statements of income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest income:
Interest and fees on loans	$ 294,596	$ 260,458	$ 221,001
Interest on securities
Taxable	10,267	13,223	12,397
Tax-exempt	7,076	4,805	4,047
Other	2,705	4,051	2,126
Total interest income	314,644	282,537	239,571
Interest expense:
Deposits	42,859	51,568	29,536
Borrowings	6,127	4,933	5,967
Total interest expense	48,986	56,501	35,503
Net interest income	265,658	226,036	204,068
Provision for credit losses	94,606	7,053	5,398
Provision for credit losses on unfunded commitments	13,361	0	0
Net interest income after provisions for credit losses	157,691	218,983	198,670
Noninterest income:
Gain (loss) from securities, net	1,631	57	(116)
(Loss) gain on sales or write-downs of other real estate owned	(1,491)	545	(99)
(Loss) gain from other assets	(90)	(104)	328
Other income	15,322	7,099	6,172
Total noninterest income	301,855	135,397	130,642
Noninterest expenses:
Salaries, commissions and employee benefits	233,768	152,084	136,892
Occupancy and equipment expense	18,979	15,641	13,976
Legal and professional fees	7,654	7,486	7,903
Data processing	11,390	10,589	9,100
Merger costs	34,879	5,385	1,594
Amortization of core deposit and other intangibles	5,323	4,339	3,185
Advertising	10,062	9,138	13,139
Other expense	55,030	40,179	37,669
Total noninterest expense	377,085	244,841	223,458
Income before income taxes	82,461	109,539	105,854
Income tax expense	18,832	25,725	25,618
Net income applicable to FB Financial Corporation and noncontrolling interest	63,629	83,814	80,236
Net income applicable to noncontrolling interest	8	0	0
Net income applicable to FB Financial Corporation	$ 63,621	$ 83,814	$ 80,236
Earnings per common share
Basic (in dollars per share)	$ 1.69	$ 2.70	$ 2.60
Diluted (in dollars per share)	$ 1.67	$ 2.65	$ 2.55
Mortgage banking income
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	$ 255,328	$ 100,916	$ 100,661
Service charges on deposit accounts
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	9,160	9,479	8,502
ATM and interchange fees
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	14,915	12,161	10,013
Investment services and trust income
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	$ 7,080	$ 5,244	$ 5,181

Consolidated statements of comp

Consolidated statements of comprehensive income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 63,629	$ 83,814	$ 80,236
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) in available-for-sale securities, net of taxes of $5,781, $6,227, and $(2,025)	18,430	17,693	(5,439)
Reclassification adjustment for (gain) loss on sale of securities included in net income, net of taxes of $(348), $24, and $9	(987)	67	44
Net change in unrealized (loss) gain in hedging activities, net of taxes of $(363), $(322), and $366	(1,031)	(914)	1,039
Reclassification adjustment for gain on hedging activities, net of taxes of $(337), $(170), and $(45)	(955)	(481)	(128)
Total other comprehensive income (loss), net of tax	15,457	16,365	(4,484)
Comprehensive income	79,086	100,179	75,752
Comprehensive income applicable to noncontrolling interests	8	0	0
Comprehensive income applicable to FB Financial Corporation	$ 79,078	$ 100,179	$ 75,752

Consolidated statements of co_2

Consolidated statements of comprehensive income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net change in unrealized gain (loss) in available for sale securities, tax	$ 5,781	$ 6,227	$ (2,025)
Reclassification adjustment for gain on sale of securities included in net income, tax	(348)	24	9
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification, tax	(363)	(322)	366
Reclassification adjustment for gain on hedging activities, tax	$ (337)	$ (170)	$ (45)

Consolidated statements of chan

Consolidated statements of changes in shareholders' equity - USD ($) $ in Thousands	Total	FNB Financial Corp.	Franklin Financial Network, Inc.	Cumulative effect of change in accounting principle	Adjusted balance	Common stock	Common stockFNB Financial Corp.	Common stockFranklin Financial Network, Inc.	Common stockAdjusted balance	Additional paid-in capital	Additional paid-in capitalFNB Financial Corp.	Additional paid-in capitalFranklin Financial Network, Inc.	Additional paid-in capitalAdjusted balance	Retained earnings	Retained earningsCumulative effect of change in accounting principle	Retained earningsAdjusted balance	Accumulated other comprehensive income, net	Accumulated other comprehensive income, netCumulative effect of change in accounting principle	Accumulated other comprehensive income, netAdjusted balance	Total common shareholders' equity	Total common shareholders' equityFNB Financial Corp.	Total common shareholders' equityFranklin Financial Network, Inc.	Total common shareholders' equityCumulative effect of change in accounting principle	Total common shareholders' equityAdjusted balance	Noncontrolling interests	Noncontrolling interestsFranklin Financial Network, Inc.	Noncontrolling interestsAdjusted balance
Beginning balance at Dec. 31, 2017				$ 0	$ 596,729				$ 30,536				$ 418,596		$ (109)	$ 147,449		$ 109	$ 148					$ 596,729			$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 80,236													$ 80,236						$ 80,236
Other comprehensive income, net of taxes	(4,484)																$ (4,484)			(4,484)
Stock based compensation expense	7,207					$ 17				$ 7,190										7,207
Restricted stock units vested and distributed, net of shares withheld	(2,664)					143				(2,807)										(2,664)
Shares issued under employee stock purchase program	1,196					29				1,167										1,196
Dividends declared	(6,363)													(6,363)						(6,363)
Ending balance at Dec. 31, 2018	671,857			(1,309)	670,548	30,725			30,725	424,146			424,146	221,213	$ (1,309)	219,904	(4,227)		(4,227)	671,857			$ (1,309)	670,548	$ 0		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	83,814													83,814						83,814
Other comprehensive income, net of taxes	16,365																16,365			16,365
Stock based compensation expense	7,089					12				7,077										7,089
Restricted stock units vested and distributed, net of shares withheld	(6,097)					274				(6,371)										(6,097)
Shares issued under employee stock purchase program	804					23				781										804
Dividends declared	(10,194)													(10,194)						(10,194)
Ending balance at Dec. 31, 2019	762,329			$ (25,018)	$ 737,311	31,034			$ 31,034	425,633			$ 425,633	293,524		$ 268,506	12,138		$ 12,138	762,329			$ (25,018)	$ 737,311	0		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	63,629													63,621						63,621					8
Other comprehensive income, net of taxes	15,457																15,457			15,457
Common stock issued in connection with acquisitions, net of registration costs		$ 34,847	$ 444,966				$ 955	$ 15,058			$ 33,892	$ 429,815									$ 34,847	$ 444,873				$ 93
Stock based compensation expense	10,214					22				10,192										10,214
Restricted stock units vested and distributed, net of shares withheld	(1,510)					123				(1,633)										(1,510)
Shares issued under employee stock purchase program	978					30				948										978
Dividends declared	(14,502)													(14,502)						(14,502)
Noncontrolling interest distribution	(8)																								(8)
Ending balance at Dec. 31, 2020	$ 1,291,382					$ 47,222				$ 898,847				$ 317,625			$ 27,595			$ 1,291,289					$ 93

Consolidated statements of ch_2

Consolidated statements of changes in shareholders' equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (USD per share)	$ 0.36	$ 0.32	$ 0.20

Consolidated statements of cash

Consolidated statements of cash flows - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 63,629,000	$ 83,814,000	$ 80,236,000
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization of fixed assets	7,009,000	5,176,000	4,334,000
Amortization of core deposit and other intangibles	5,323,000	4,339,000	3,185,000
Capitalization of mortgage servicing rights	(47,025,000)	(42,151,000)	(54,913,000)
Net change in fair value of mortgage servicing rights	47,660,000	26,299,000	2,763,000
Stock-based compensation expense	10,214,000	7,089,000	7,207,000
Provision for credit losses	94,606,000	7,053,000	5,398,000
Provision for credit losses on unfunded commitments	13,361,000	0	0
Provision for mortgage loan repurchases	2,607,000	362,000	174,000
Accretion of yield on purchased loans	(3,788,000)	(8,556,000)	(7,608,000)
Accretion of discounts and amortization of premiums on securities, net	7,382,000	3,026,000	2,768,000
Gain from securities, net	(1,631,000)	(57,000)	116,000
Originations of loans held for sale	(6,650,258,000)	(4,540,652,000)	(5,958,066,000)
Repurchases of loans held for sale	0	(9,919,000)	(12,232,000)
Proceeds from sale of loans held for sale	6,487,809,000	4,662,728,000	6,260,532,000
Gain on sale and change in fair value of loans held for sale	(270,802,000)	(100,228,000)	(88,743,000)
Net loss (gain) or write-downs of other real estate owned	1,491,000	(545,000)	99,000
Loss (gain) on other assets	90,000	104,000	(328,000)
Relief of goodwill	0	100,000	0
Provision for deferred income taxes	(25,530,000)	(1,916,000)	6,359,000
Changes in:
Other assets and interest receivable	(74,628,000)	(45,180,000)	(22,966,000)
Accrued expenses and other liabilities	63,194,000	13,019,000	(16,107,000)
Net cash (used in) provided by operating activities	(269,287,000)	63,905,000	212,208,000
Activity in available-for-sale securities:
Sales	146,494,000	24,498,000	2,742,000
Maturities, prepayments and calls	220,549,000	113,018,000	73,066,000
Purchases	(424,971,000)	(151,425,000)	(203,844,000)
Net change in loans	118,414,000	(364,975,000)	(491,774,000)
Purchases of FHLB stock	(515,000)	(2,544,000)	(2,020,000)
Proceeds from sale of mortgage servicing rights	0	29,160,000	39,428,000
Purchases of premises and equipment	(5,934,000)	(6,812,000)	(10,144,000)
Proceeds from the sale of premises and equipment	0	1,275,000	357,000
Proceeds from the sale of other real estate owned	6,937,000	3,860,000	4,819,000
Proceeds from the sale of other assets	0	0	869,000
Net cash received in business combinations (See Note 2)	248,447,000	171,032,000	0
Net cash provided by (used in) investing activities	309,421,000	(182,913,000)	(586,501,000)
Cash flows from financing activities:
Net increase in demand deposits	1,519,868,000	249,348,000	75,906,000
Net decrease in time deposits	(328,035,000)	(75,004,000)	431,416,000
Net increase (decrease) in securities sold under agreements to repurchase	5,262,000	(908,000)	788,000
Payments on FHLB advances	(250,000,000)	0	(120,607,000)
Proceeds from FHLB advances	0	68,235,000	0
Issuance of subordinated debt, net of issuance costs	98,228,000	0	0
Amortization of subordinated debt issuance costs	(436,000)	0	0
Proceeds from other borrowings	15,000,000	0	0
Share based compensation withholding payments	(1,510,000)	(6,097,000)	(2,664,000)
Net proceeds from sale of common stock under employee stock purchase program	978,000	804,000	1,196,000
Dividends paid	(14,264,000)	(10,045,000)	(6,137,000)
Noncontrolling interest distribution	(8,000)	0	0
Net cash provided by financing activities	1,045,083,000	226,333,000	379,898,000
Net change in cash and cash equivalents	1,085,217,000	107,325,000	5,605,000
Cash and cash equivalents at beginning of the period	232,681,000	125,356,000	119,751,000
Cash and cash equivalents at end of the period	1,317,898,000	232,681,000	125,356,000
Supplemental cash flow information:
Interest paid	48,679,000	55,051,000	31,992,000
Taxes paid	20,419,000	25,920,000	24,387,000
Supplemental noncash disclosures:
Transfers from loans to other real estate owned	2,746,000	5,487,000	2,138,000
Transfers (to) from premises and equipment to other real estate owned	(841,000)	4,290,000	0
Loans provided for sales of other real estate owned	305,000	166,000	1,019,000
Transfers from loans to loans held for sale	11,483,000	7,891,000	11,888,000
Transfers from loans held for sale to loans	55,766,000	12,259,000	14,732,000
Stock consideration paid in business combination	480,867,000	0	0
Trade date payable - securities	0	0	2,120,000
Dividends declared not paid on restricted stock units	238,000	149,000	226,000
Decrease to retained earnings for adoption of new accounting standards	25,018,000	1,309,000	109,000
Right-of-use assets obtained in exchange for operating lease liabilities	$ 2,393,000	$ 37,916,000	$ 0

Basis of presentation

Basis of presentation	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation: (A) Organization and Company overview: FB Financial Corporation (the “Company”) is a financial holding company headquartered in Nashville, Tennessee. The consolidated financial statements include the Company and its wholly-owned subsidiaries, FirstBank (the "Bank") and FirstBank Risk Management, Inc. The Bank operates through 81 full-service branches throughout Tennessee, southern Kentucky, north Alabama, and north Georgia, and a national online mortgage business with office locations across the Southeast, which primarily originates mortgage loans to be sold in the secondary market. On August 15, 2020, the Company completed its previously announced acquisition of Franklin Financial Network, Inc. ("Franklin"). The transaction added a new subsidiary to the Company, FirstBank Risk Management ("FBRM") (formerly known as Franklin Synergy Risk Management), which provides risk management services to the Company in the form of enhanced insurance coverages. It also added a new subsidiary to the Bank, FirstBank Investments of Tennessee, Inc. ("FBIT"), which provides investment services to the Bank. FBIT has a wholly owned subsidiary, FirstBank Investments of Nevada, Inc. ("FBIN") to provide investment services to FBIT. FBIN has a controlling interest in a subsidiary, FirstBank Preferred Capital, Inc. ("FBPC"), which serves as a real estate investment trust ("REIT"), to allow the Bank to sell real estate loans to the REIT to obtain a tax benefit. Refer to Note 2, "Mergers and acquisitions" for additional information on this acquisition. The Bank is subject to competition from other financial services companies and financial institutions. The Company and the Bank are also subject to the regulations of certain federal and state agencies and undergo periodic examinations by those regulatory authorities. See "Supervision and regulation" in part 1, item 1, for more details regarding regulatory oversight. The Company continues to qualify as an emerging growth company as defined by the "Jumpstart Our Business Startups Act" ("JOBS Act"). During 2020, the COVID-19 health pandemic created a crisis resulting in volatility in financial markets, sudden, unprecedented job losses, and disruption in consumer and commercial behavior, resulting in governments in the United States and globally to intervene with varying levels of direct monetary support and fiscal stimulus packages. All industries, municipalities and consumers have been impacted by the health crisis to some degree, including the markets that we serve. In attempts to “flatten the curve”, businesses not deemed essential were closed or constrained to capacity limitations, individuals were asked to restrict their movements, observe social distancing and shelter in place. These actions resulted in rapid decreases in commercial and consumer activity, temporary closures of many businesses, leading to a loss of revenues and a rapid increase in unemployment, widening of credit spreads, dislocation of bond markets, disruption of global supply chains and changes in consumer spending behavior. As certain restrictions began lifting and more businesses were allowed to open their doors in late 2020, we began to experience a slow improvement in commerce through much of the Company's footprint. Despite the pickup in economic activity late in the year, there is uncertainty regarding the long term effects on the global economy which could have an adverse impact on the Company. (B) Basis of presentation: The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America and general banking industry. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and the reported results of operations for the year then ended. Actual results could differ significantly from those estimates. It is possible that the Company's estimate of the allowance for credit losses and determination of impairment of goodwill could change as a result of the continued impact of the COVID-19 pandemic on the economy. The resulting change in these estimates could be material to the Company's financial statements. The consolidated financial statements include the accounts of the Company, the Bank, and its’ wholly-owned subsidiaries, FirstBank Insurance, Inc., Investors Title Company, in addition to the newly acquired subsidiaries mentioned above. All significant intercompany accounts and transactions have been eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current period presentation without any impact on the reported amounts of net income or shareholders’ equity. Certain accounting policies identified below were modified during the year ended December 31, 2020. Please refer to the Company's audited financial statements on Form 10-K filed on March 13, 2020 for accounting policies in place as of December 31, 2019. (C) Cash flows: For purposes of reporting consolidated cash flows, cash and cash equivalents include cash on hand, amounts due from banks, federal funds sold and interest earning deposits in other financial institutions with maturities of less than 90 days at the date of purchase. These amounts are reported in the consolidated balance sheets caption “Cash and cash equivalents.” Net cash flows are reported for loans held for investment, deposits and short-term borrowings. (D) Cash and cash equivalents: The Company considers all highly liquid unrestricted investments with a maturity of three months or less when purchased to be cash equivalents. (E) Investment securities: Debt securities are classified as held to maturity and carried at amortized cost, excluding accrued interest, when management has the positive intent and ability to hold them to maturity. Debt securities are classified as available-for-sale when they might be sold before maturity. Available-for-sale debt securities are carried at fair value, with unrealized holding gains and losses reported in other comprehensive income, net of applicable taxes. Beginning January 1, 2020, unrealized losses resulting from credit losses for available-for-sale debt securities are recognized in earnings as a provision for credit losses. Unrealized losses that do not result from credit losses are excluded from earnings and reported as accumulated other comprehensive income, net of applicable taxes, which is included in equity. Accrued interest receivable is separated from other components of amortized cost and presented separately on the consolidated balance sheets. Equity securities with readily determinable market values are carried at fair value on the balance sheet with any periodic changes in value made through adjustments to the statement of income. Equity securities without readily determinable market values are carried at cost less impairment and included in other assets on the consolidated balance sheets. Interest income includes the amortization and accretion of purchase premium and discount. Premiums and discounts on securities are amortized on the level-yield method anticipating prepayments based upon the prior three month average monthly prepayments when available. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. The Company evaluates available-for-sale securities for expected credit losses at least on a quarterly basis, and more frequently when economic or market concerns warrant such evaluation. For securities in an unrealized loss position, consideration is given to the extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. In analyzing an issuer’s financial condition, the Company considers whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred, and the results of reviews of the issuer’s financial condition. When credit losses are expected to occur, the amount of the expected credit loss recognized in earnings depends on the Company's intention to sell the security or if it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis. If the Company intends to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the expected credit loss recognized in earnings is equal to the entire difference between its amortized cost basis and its fair value at the date it was determined to be impaired due to credit losses or other factors. The previous amortized cost basis less the impairment recognized in earnings becomes the new amortized cost basis of the investment. However, if the Company does not intend to sell the security and it is not more likely than not to be required to sell the security before recovery of its amortized cost basis, the difference between the amortized cost and the fair value is separated into the amount representing the credit loss and the amount related to all other factors. If the Company determines a decline in fair value below the amortized cost basis of an available-for-sale investment security has resulted from credit related factors, beginning January 1, 2020 with the adoption of CECL, the Company records a credit loss through an allowance for credit losses. The allowance for credit losses is limited by the amount that the fair value is less than amortized cost. The amount of the allowance for credit losses is determined based on the present value of cash flows expected to be collected and is recognized as a charge to earnings. The amount of the impairment related to other, non-credit related, factors is recognized in other comprehensive income, net of applicable taxes. The Company did not record any provision for credit losses for its available-for-sale debt securities during the year ended December 31, 2020, as the majority of the investment portfolio is government guaranteed and declines in fair value below amortized cost were determined to be non-credit related. (F) Federal Home Loan Bank (FHLB) stock: The Bank accounts for its investments in FHLB stock in accordance with FASB ASC Topic 942-325 "Financial Services-Depository and Lending-Investments-Other." FHLB stock are equity securities that do not have a readily determinable fair value because its ownership is restricted and lacks a market. FHLB stock is carried at cost and evaluated for impairment. (G) Loans held for sale: Loans originated and intended for sale in the secondary market, primarily mortgage loans, are carried at fair value as permitted under the guidance in ASC 825, “Financial Instruments” (“ASC 825”). Net gains (losses) of $24,233, $(2,861), and $(4,539) resulting from fair value changes of these mortgage loans were recorded in income during the years ended December 31, 2020, 2019 and 2018, respectively. The amount does not reflect changes in fair values of related derivative instruments used to hedge exposure to market-related risks associated with these mortgage loans. The change in fair value of both mortgage loans held for sale and the related derivative instruments are recorded in “Mortgage banking income” in the Consolidated Statements of Income. Gains and losses are recognized in Mortgage banking income on the consolidated statements of income at the time the loan is closed. Pass through origination costs and related loan fees are also included in “Mortgage banking income”. Periodically, the Bank will transfer mortgage loans originated for sale in the secondary markets into the loan portfolio based on current market conditions, the overall secondary marketability of the loan and the status of the loan. During the years ended December 31, 2020, 2019, and 2018, the Bank transferred $55,766, $12,259, and $14,732, respectively, of residential mortgage loans into its loans held for investment portfolio. The loans are transferred into the portfolio at fair value at the date of transfer. Additionally, occasionally the Bank will transfer loans from the held for investment portfolio into loans held for sale. At the time of the transfer, loans are marked to fair value through the allowance for credit losses and reclassified to loans held for sale. During the year ended December 31, 2020, the Company transferred $2,116 from the portfolio to loans held for sale. During the year ended December 31, 2018, the Company transferred $11,888 from the portfolio to loans held for sale,resulting in an adjustment to the allowance for loan losses of $349. Government National Mortgage Association (GNMA) optional repurchase programs allow financial institutions to buy back individual delinquent mortgage loans that meet certain criteria from the securitized loan pool for which the institution provides servicing and was the original transferor. At the servicer’s option and without GNMA’s prior authorization, the servicer may repurchase such a delinquent loan for an amount equal to 100 percent of the remaining principal balance of the loan. Under FASB ASC Topic 860, “Transfers and Servicing,” this buy-back option is considered a conditional option until the delinquency criteria are met, at which time the option becomes unconditional. When the Company is deemed to have regained effective control over these loans under the unconditional buy-back option, the loans can no longer be reported as sold and must be brought back onto the balance sheet, regardless of whether the Company intends to exercise the buy-back option if the buyback option provides the transferor a more-than-trivial benefit. When this criteria is met and these are repurchased, after a period of borrower performance, the loans are transferred to loans held for sale at fair value and are able to be repooled into new Ginnie Mae guaranteed securities. During the years ended December 31, 2020 and 2019, the Company transferred $9,367 and $7,891, respectively, of these repurchased loans from loans held for investment to loans held for sale. There was no such activity during the year ended December 21, 2018. As of December 31, 2020, and 2019, there were $151,184 and $51,705, respectively, of delinquent GNMA loans that had previously been sold which the Company had the option to repurchase; however, the Company determined there not to be a "more-than-trivial benefit" based on an analysis of interest rates and assessment of potential reputational risk associated with these loans. As such, the Company did not record these loans on the balance sheets. During the year ended December 31, 2020 , the Company acquired a portfolio of commercial loans, including shared national credits and institutional healthcare loans, as part of the Franklin transaction that the Company has elected to account for as held for sale. Changes in fair value from the acquisition date fair value are included in 'other noninterest income' on the consolidated statement of income. (H) Loans (excluding purchased credit deteriorated loans): Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are stated at the principal amount outstanding less any purchase accounting discount net of any accretion recognized to date. Interest on loans is recognized as income by using the simple interest method on daily balances of the principal amount outstanding plus any accretion of purchase accounting discounts. Loans on which the accrual of interest has been discontinued are designated as nonaccrual loans. Accrual of interest is discontinued on loans past due 90 days or more unless the credit is well secured and in the process of collection. Also, a loan may be placed on nonaccrual status prior to becoming past due 90 days if management believes, after considering economic and business conditions and collection efforts, that the borrower’s financial condition is such that collection of principal or interest is doubtful. The decision to place a loan on nonaccrual status prior to becoming past due 90 days is based on an evaluation of the borrower’s financial condition, collateral liquidation value, economic and business conditions and other factors that affect the borrower’s ability to pay. When a loan is placed on nonaccrual status, the accrued but unpaid interest is charged against current period operations. Thereafter, interest on nonaccrual loans is recognized only as received if future collection of principal is probable. If the collectability of outstanding principal is doubtful, interest received is applied as a reduction of principal. A loan may be restored to accrual status when principal and interest are no longer past due or it otherwise becomes both well secured and collectability is reasonably assured. The Company continues to monitor the level of accrued interest receivable, however an allowance for credit losses was not required as of December 31, 2020. (I) Allowance for credit losses: The allowance for credit losses represents the portion of the loan's amortized cost basis that the Company does not expect to collect due to credit losses over the loan's life, considering past events, current conditions, and reasonable and supportable forecasts of future economic conditions considering macroeconomic forecasts. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. The allowance for credit losses is based on the loan's amortized cost basis, excluding accrued interest receivable, as the Company promptly charges off uncollectible accrued interest receivable. Management’s determination of the appropriateness of the allowance is based on periodic evaluation of the loan portfolio, lending-related commitments and other relevant factors, including macroeconomic forecasts and historical loss rates. In future quarters, the Company may update information and forecasts that may cause significant changes in the estimate in those future quarters. As of January 1, 2020, the Company’s policy for the allowance for credit losses changed with the adoption of CECL. As permitted, the new guidance was implemented using a modified retrospective approach with the impact of the initial adoption being recorded through retained earnings at January 1, 2020, with no restatement of prior periods. Prior to adopting CECL, the Company calculated the allowance using an incurred loss approach. Beginning January 1, 2020, the Company calculates the allowance using a lifetime expected credit loss approach as described in the previous paragraph. See Note 5, "Loans and allowance for credit losses" for additional details related to the Company's specific calculation methodology. The allowance for credit losses is the Company’s best estimate. Actual losses may differ from the December 31, 2020 allowance for credit loss as the CECL estimate is sensitive to economic forecasts and management judgment. The following portfolio segments have been identified: Commercial and industrial loans. The Company provides a mix of variable and fixed rate commercial and industrial loans. Commercial and industrial loans are typically made to small- and medium-sized manufacturing, wholesale, retail and service businesses for working capital and operating needs and business expansions, including the purchase of capital equipment and loans made to farmers relating to their operations. This category also includes loans secured by manufactured housing receivables. Commercial and industrial loans generally include lines of credit and loans with maturities of five years or less. The loans are generally made with operating cash flows as the primary source of repayment, but may also include collateralization by inventory, accounts receivable, equipment and/or personal guarantees. The ability of the borrower to collect accounts receivable, and to turn inventory into sales are risk factors in the repayment of the loan. Construction loans. Construction loans include commercial construction, land acquisition and land development loans and single-family interim construction loans to small- and medium-sized businesses and individuals. These loans are generally secured by the land or the real property being built and are made based on our assessment of the value of the property on an as-completed basis. We expect to continue to make construction loans at a similar pace so long as demand continues and the market for and values of such properties remain stable or continue to improve in our markets. These loans can carry risk of repayment when projects incur cost overruns, have an increase in the price of building materials, encounter zoning and environmental issues, or encounter other factors that may affect the completion of a project on time and on budget. Additionally, repayment risk may be negatively impacted when the market experiences a deterioration in the value of real estate. Residential real estate 1-4 family mortgage loans . The Company’s residential real estate 1-4 family mortgage loans are primarily made with respect to and secured by single family homes, which are both owner-occupied and investor owned and include manufactured homes with real estate. The Company intends to continue to make residential 1-4 family housing loans at a similar pace, so long as housing values in our markets do not deteriorate from current prevailing levels and we are able to make such loans consistent with our current credit and underwriting standards. First lien residential 1-4 family mortgages may be affected by unemployment or underemployment and deteriorating market values of real estate. Residential line of credit loans. The Company’s residential line of credit loans are primarily revolving, open-end lines of credit secured by 1-4 residential properties. The Company intends to continue to make home equity loans if housing values in our markets do not deteriorate from current prevailing levels and we are able to make such loans consistent with our current credit and underwriting standards. Second lien residential 1-4 family mortgages may be affected by unemployment or underemployment and deteriorating market values of real estate. Multi-family residential loans. The Company’s multi-family residential loans are primarily secured by multi-family properties, such as apartments and condominium buildings. These loans also may be affected by unemployment or underemployment and deteriorating market values of real estate. Commercial real estate loans . The Company’s commercial real estate owner-occupied loans include loans to finance commercial real estate owner occupied properties for various purposes including use as offices, warehouses, production facilities, health care facilities, retail centers, restaurants, churches and agricultural based facilities. Commercial real estate owner-occupied loans are typically repaid through the ongoing business operations of the borrower, and hence are dependent on the success of the underlying business for repayment and are more exposed to general economic conditions. Commercial real estate non-owner occupied loans . The Company’s commercial real estate non-owner occupied loans include loans to finance commercial real estate non-owner occupied investment properties for various purposes including use as offices, warehouses, health care facilities, hotels, mixed-use residential/commercial, manufactured housing communities, retail centers, assisted living facilities and agricultural based facilities. Commercial real estate non-owner occupied loans are typically repaid with the funds received from the sale of the completed property or rental proceeds from such property, and are therefore more sensitive to adverse conditions in the real estate market, which can also affected by general economic conditions. Consumer and other loans . The Company’s consumer and other loans include loans to individuals for personal, family and household purposes, including car, boat and other recreational vehicle loans, manufactured homes without real estate, and personal lines of credit. Consumer loans are generally secured by vehicles and other household goods. The collateral securing consumer loans may depreciate over time. The company seeks to minimize these risks through its underwriting standards. Other loans also include loans to states and political subdivisions in the U.S. These loans are generally subject to the risk that the borrowing municipality or political subdivision may lose a significant portion of its tax base or that the project for which the loan was made may produce inadequate revenue. (J) Business combinations, accounting for acquired loans with credit deterioration and off-balance sheet financial instruments: Business combinations are accounted for by applying the acquisition method in accordance with Accounting Standards Codification ("ASC") 805, “Business Combinations” (“ASC 805”). Under the acquisition method, identifiable assets acquired and liabilities assumed and any non-controlling interest in the acquiree at the acquisition date are measured at their fair values as of that date. Any excess of the purchase price over fair value of net assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including any other identifiable intangible assets, exceed the purchase price, a bargain purchase gain is recognized. Results of operations of acquired entities are included in the consolidated statements of income from the date of acquisition. Beginning January 1, 2020, loans acquired in business combinations with evidence of more-than-insignificant credit deterioration since origination are considered to be Purchased Credit Deteriorated ("PCD"). The Company developed multiple criteria to assess the presence of more–than–insignificant credit deterioration in acquired loans, mainly focused on changes in credit quality and payment status. While general criteria have been established, each acquisition will vary in its specific facts and circumstances and the Company will apply judgment around PCD identification for each individual acquisition based on their unique portfolio mix and risks identified. The Company adopted ASC 326 using the prospective transition approach for loans previously classified as purchased credit impaired ("PCI") and accounted for under ASC 310-30. In accordance with the standard, management did not reassess whether PCI assets met the criteria of PCD assets as of the date of adoption and all PCI loans were transitioned to PCD loans upon adoption. Under PCD accounting,the amount of expected credit losses as of the acquisition date is added to the purchase price of the PCD loan. This establishes the amortized cost basis of the PCD loan. The difference between the unpaid principal balance of the PCD loan and the amortized cost basis of the PCD loan as of the acquisition date is the non-credit discount. Interest income for a PCD loan is recognized by accreting the amortized cost basis of the PCD loan to its contractual cash flows. The discount related to estimated credit losses on acquisition recorded as an allowance for credit losses will not be accreted into interest income. Only the noncredit-related discount will be accreted into interest income and subsequent adjustments to expected credit losses will flow through the provision for credit losses on the income statement. Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded, unless considered derivatives. For loan commitments that are not accounted for as derivatives and when the obligation is not unconditionally cancellable by the Company, the Company applies the CECL methodology to estimate the expected credit loss on off-balance-sheet commitments. The estimate of expected credit losses for off-balance-sheet credit commitments is recognized as a liability. When the loan is funded, an allowance for expected credit losses is estimated for that loan using the CECL methodology, and the liability for off-balance-sheet commitments is reduced. When applying the CECL methodology to estimate the expected credit loss, the Company considers the likelihood that funding will occur, the contractual period of exposure to credit loss, the risk of loss, historical loss experience, and current conditions along with expectations of future economic conditions. (K) Premises and equipment: Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. Provisions for depreciation are computed principally on the straight-line method and are charged to occupancy expense over the estimated useful lives of the assets. Maintenance agreements are amortized to expense over the period of time covered by the agreement. Costs of major additions, replacements or improvements are capitalized while expenditures for maintenance and repairs are charged to expense as incurred. For financial statement purposes, the estimated useful life for premises is the lesser of the remaining useful life per third party appraisal or forty years, for furniture and fixtures the estimated useful life is seven three (L) Other real estate owned: Real estate acquired through, or in lieu of, loan foreclosure is initially recorded at fair value less the estimated cost to sell at the date of foreclosure, which may establish a new cost basis. Other real estate owned may also include excess facilities and properties held for sale as described in Note 8. Physical possession of residential real estate property collateralizing a consumer mortgage loan occurs when legal title is obtained upon completion of foreclosure or when the borrower conveys all interest in the property to satisfy the loan. After initial measurement, valuations are periodically performed by management and the asset is carried at the lower of carrying amount or fair value less costs to sell. Revenue and expenses from operations are included in other noninterest income and noninterest expenses. Losses due to the valuation of the property are included in gain (loss) on sales or write-downs of other real estate owned. (M) Leases: The Company leases certain banking, mortgage and operations locations. Effective January 1, 2019, the Company records leases on the balance sheet in the form of a lease liability for the present value of future minimum payments under the lease terms and a right-of-use asset equal to the lease liability adjusted for items such as deferred or prepaid rent, incentive liabilities, leasehold intangibles and any impairment of the right-of-use asset. In determining whether a contract contains a lease, management conducts an analysis at lease inception to ensure an asset was specifically identified and the Company has control of use of the asset. For contracts determined to be leases entered into after January 1, 2019, the Company performs additional analysis to determine whether the lease should be classified as a finance or operating lease. The Company considers a lease to be a finance lease if future minimum lease payments amount to greater than 90% of the asset's fair value or if the lease term is equal to or greater than 75% of the asset's estimated economic useful life. As of December 31, 2020, the Company has one finance lease that resulted from the Franklin transaction. As of December 31, 2019, the Company did not have any leases that were determined to be finance leases. The Company does not record leases on the consolidated balance sheets that are classified as short term (less than one year). Additionally, the Company has not recorded equipment leases or leases in which the Company is the lessor on the consolidated balance sheets as these are not material to the Company. At lease inception, the Company determines the lease term by adding together the minimum lease term and all optional renewal periods that it is reasonably certain to renew. This determination is at management's full discretion and is made through consideration of the asset, market conditions, comp

Mergers and acquisitions

Mergers and acquisitions	12 Months Ended
	Dec. 31, 2020
Business Combinations [Abstract]
Mergers and acquisitions	Mergers and acquisitions: The following mergers and acquisitions were accounted for pursuant to FASB ASC 805. Accordingly, the purchase price of each acquisition was allocated to the acquired assets and liabilities assumed based on estimated fair values as of the respective acquisition dates. The excess of the purchase price over the net assets acquired was recorded as goodwill. Franklin Financial Network, Inc. merger Effective August 15, 2020, the Company completed its previously announced merger with Franklin Financial Network, Inc. and its wholly owned subsidiaries, with FB Financial Corporation continuing as the surviving entity. After consolidating duplicative locations the merger added 10 branches and expanded the Company's footprint in middle Tennessee and the Nashville metropolitan statistical area. Under the terms of the agreement, the Company acquired total assets of $3.63 billion, loans of $2.79 billion and assumed total deposits of $3.12 billion. Total loans acquired includes a non-strategic institutional portfolio with a fair value of $326,206 the Company classified as held for sale. Franklin common shareholders received 15,058,181 shares of the Company's common stock, net of the equivalent value of 44,311 shares withheld on certain Franklin employee equity awards that vested upon change in control, as consideration in connection with the merger, in addition to $31,330 in cash consideration. Also included in the purchase price, the Company issued replacement restricted stock units for awards initially granted by Franklin during 2020 that did not vest upon change in control, with a total fair value of $674 attributed to pre-combination service. Based on the closing price of the Company's common stock on the New York Stock Exchange of $29.52 on August 15, 2020, the merger consideration represented approximately $477,830 in aggregate consideration. Goodwill of $67,191 recorded in connection with the transaction resulted from the ongoing business contribution, reputation, operating model and expertise of Franklin. Measurement period adjustments recorded during the fourth quarter of 2020 amounting to $6,546 related to the finalization of valuations relating primarily to commercial loans held for sale, deposits and premises and equipment. The goodwill is not deductible for income tax purposes. Goodwill is included in the Banking segment as substantially all of the operations resulting from the acquisition of Franklin are in alignment with the Company's banking business. The Company incurred $32,364 in merger expenses during the year ended December 31, 2020 in connection with this transaction. These expenses are primarily comprised of professional services, employee-related costs, costs associated with branch consolidation, and integration costs. The following table presents an allocation of the consideration to net assets acquired: Purchase Price: Equity consideration Franklin shares outstanding (1) 15,588,337 Franklin options converted to net shares 62,906 15,651,243 Exchange ratio to FB Financial shares 0.965 FB Financial shares to be issued as merger consideration (2) 15,102,492 Issuance price as of August 15, 2020 $ 29.52 Value of FB Financial stock to be issued as merger consideration $ 445,826 Less: tax withholding on vested restricted stock awards, units and options (3) (1,308) Value of FB Financial stock issued $ 444,518 FB Financial shares issued 15,058,181 Franklin restricted stock units that do not vest on change in control 114,915 Replacement awards issued to Franklin employees 118,776 Fair value of replacement awards $ 3,506 Fair value of replacement awards attributable to pre-combination service $ 674 Cash consideration Total Franklin shares and net shares outstanding 15,651,243 Cash consideration per share $ 2.00 Total cash to be paid to Franklin (4) $ 31,330 Total purchase price $ 477,830 Fair value of net assets acquired 410,639 Goodwill resulting from merger $ 67,191 (1) Franklin shares outstanding includes restricted stock awards and restricted stock units that vested upon change in control. (2) Only factors in whole share issuance. Cash was paid in lieu of fractional shares. (3) Represents the equivalent value of approximately 44,311 shares of FB Financial Corporation stock on August 15, 2020. (4) Includes $28 of cash paid in lieu of fractional shares. FNB Financial Corp. merger Effective February 14, 2020, the Company completed its previously announced acquisition of FNB Financial Corp. and its wholly owned subsidiary, Farmers National Bank of Scottsville (collectively, "Farmers National"). Following the acquisition, Farmers National was merged into the Company with FB Financial Corporation continuing as the surviving entity. The transaction added four branches and expanded the Company's footprint into Kentucky. Under the terms of the agreement, the Company acquired total assets of $258,218, loans of $182,171 and assumed total deposits of $209,535. Farmers National shareholders received 954,797 shares of the Company's common stock as consideration in connection with the merger, in addition to $15,001 in cash consideration. Based on the closing price of the Company's common stock on the New York Stock Exchange of $36.70 on February 14, 2020, the merger consideration represented approximately $50,042 in aggregate consideration. Goodwill of $6,319 recorded in connection with the transaction resulted from the ongoing business contribution of Farmers National and anticipated synergies arising from the combination of certain operational areas of the Company. Goodwill resulting from this transaction is not deductible for income tax purposes. Goodwill is included in the Banking segment as substantially all of the operations resulting from the acquisition of Farmers National are in alignment with the Company's core banking business. The Company incurred $2,338 in merger expenses during the year ended December 31, 2020 in connection with this transaction. These expenses are primarily comprised of professional services, employee-related costs, and integration costs. The following table presents the total purchase price, fair value of net assets acquired, and the goodwill as of the acquisition date. Consideration: Net shares issued 954,797 Purchase price per share on February 14, 2020 $ 36.70 Value of stock consideration $ 35,041 Cash consideration paid 15,001 Total purchase price $ 50,042 Fair value of net assets acquired 43,723 Goodwill resulting from merger $ 6,319 Atlantic Capital Bank, N.A. Branches On April 5, 2019, the Bank completed its branch acquisition to purchase 11 Tennessee and three Georgia branch locations (the "Branches") from Atlantic Capital Bank, N.A., a national banking association and a wholly owned subsidiary of Atlantic Capital Bancshares, Inc., a Georgia corporation (collectively, "Atlantic Capital") in a transaction valued at $36,790, further increasing market share in existing markets and expanding the Company's footprint into new locations. The branch acquisition added $588,877 in customer deposits at a premium of 6.25%, $374,966 in loans at 99.32% of principal outstanding and $31,961 of goodwill. All of the operations of the Branches are included in the Banking segment. Net assets acquired The following table summarizes the estimated fair values of assets acquired and liabilities assumed as of the respective acquisition dates: As of August 15, 2020 As of February 14, 2020 Franklin Financial Network, Inc. FNB Financial Corp. ASSETS Cash and cash equivalents $ 284,004 $ 10,774 Investments 373,462 50,594 Mortgage loans held for sale, at fair value 38,740 — Commercial loans held for sale, at fair value 326,206 — Loans held for investment, net of fair value adjustments 2,427,527 182,171 Allowance for credit losses on PCD loans (24,831) (669) Premises and equipment 45,471 8,049 Operating lease right-of-use assets 23,958 14 Mortgage servicing rights 5,111 — Core deposit intangible 7,670 2,490 Other assets 124,571 4,795 Total assets $ 3,631,889 $ 258,218 LIABILITIES Deposits: Noninterest-bearing $ 505,374 $ 63,531 Interest-bearing 1,783,379 26,451 Money market and savings 342,093 37,002 Customer time deposits 383,433 82,551 Brokered and internet time deposits 107,452 — Total deposits 3,121,731 209,535 Borrowings 62,435 3,192 Operating lease liabilities 24,330 14 Accrued expenses and other liabilities 12,661 1,754 Total liabilities assumed 3,221,157 214,495 Noncontrolling interests acquired 93 — Net assets acquired $ 410,639 $ 43,723 Purchased credit-deteriorated loans Under CECL, the Company is required to determine whether purchased loans held for investment have experienced more-than-insignificant deterioration in credit quality since origination. Loans that have experienced this level of deterioration in credit quality are subject to special accounting at initial recognition and measurement. The Company initially measures the amortized cost of a PCD loan by adding the acquisition date estimate of expected credit losses to the loan's purchase price (i.e. the "gross up" approach). There is no provision for credit loss recognized upon acquisition of a PCD loan because the initial allowance is established through gross-up of the loans' amortized cost. The Company determined that 27.9% of the Franklin loan portfolio had more-than-insignificant deterioration in credit quality since origination as of the acquisition date. This included deterioration in credit metrics, such as delinquency, nonaccrual status or risk ratings as well as certain loans within designated industries of concern that have been negatively impacted by COVID-19. Additionally, it was determined that 10.1% of the Farmers National loan portfolio had more-than-insignificant deterioration in credit quality since origination as of the February acquisition date. These were primarily delinquent loans as of February 14, 2020, or loans that Farmers National had classified as nonaccrual or TDR prior to the Company's acquisition. As of August 15, 2020 As of February 14, 2020 Franklin Financial Network, Inc. FNB Financial Corp. Purchased credit-deteriorated loans Principal balance $ 693,999 $ 18,964 Allowance for credit losses at acquisition (24,831) (669) Net premium attributable to other factors 8,810 63 Loans purchased credit-deteriorated fair value $ 677,978 $ 18,358 Loans recognized through the acquisition of Franklin and Farmers National that have not experienced more-than-insignificant credit deterioration since origination are initially recognized at the purchase price. Expected credit losses are measured under CECL through the provision for credit losses. The Company recorded provisions for credit losses in the amounts of $52,822 and $2,885 as of August 15, 2020 and February 14, 2020, respectively, in the income statement related to estimated credit losses on non-PCD loans from Franklin and Farmers National, respectively. Additionally, the Company estimates expected credit losses on off-balance sheet loan commitments that are not accounted for as derivatives. The Company recorded an increase in provision for credit losses from unfunded commitments of $10,499 as of August 15, 2020 related to the Franklin acquisition. Pro forma financial information (unaudited) The results of operations of the acquisitions have been included in the Company's consolidated financial statements prospectively beginning on the date of each acquisition. The acquisitions have been fully integrated with the Company's existing operations. Accordingly, post-acquisition net interest income, total revenues, and net income are not discernible.The following unaudited pro forma condensed consolidated financial information presents the results of operations for the year ended December 31, 2020 and 2019, respectively, as though the Franklin merger and Farmers National acquisition had been completed as of January 1, 2019, and the Atlantic Capital acquisition had been completed as of January 1, 2018. The unaudited estimated pro forma information combines the historical results of the mergers with the Company’s historical consolidated results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the periods presented. Merger expenses are reflected in the periods they were incurred. The pro forma information is not indicative of what would have occurred had the transactions taken place on January 1, 2019 and January 1, 2018, and does not include the effect of cost-saving or revenue-enhancing strategies. Year Ended December 31, 2020 2019 2018 Net interest income $ 338,092 $ 348,660 $ 220,269 Total revenues $ 654,374 $ 504,273 $ 354,258 Net income $ 65,135 $ 99,898 $ 78,762

Cash and cash equivalents conce

Cash and cash equivalents concentrations	12 Months Ended
	Dec. 31, 2020
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents concentrations	Cash and cash equivalents concentrations:The Bank is required to maintain an average reserve balance with the Federal Reserve Bank or maintain such reserve balance in the form of cash. The required balance was $0 and $20,881 as of December 31, 2020 and 2019. The Bank maintains its cash in bank deposit accounts, which, at times, may exceed federally insured limits. The Bank has not experienced any losses in such correspondent accounts and believes it is not exposed to any significant credit risk from cash and cash equivalents. The Bank had cash in the form of Federal funds sold included in cash and cash equivalents of $121,153 and $131,119 as of December 31, 2020 and 2019, respectively.

Investment securities

Investment securities	12 Months Ended
	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Investment securities	Investment securities: The following tables summarize the amortized cost, allowance for credit losses and fair value of the available-for-sale debt securities and the corresponding amounts of unrealized gains and losses recognized in accumulated other comprehensive income at December 31, 2020 and 2019: December 31, 2020 Amortized cost Gross unrealized gains Gross unrealized losses Allowance for credit losses for investments Fair Value Investment Securities Available-for-sale debt securities U.S. government agency securities $ 2,000 $ 3 $ — $ — $ 2,003 Mortgage-backed securities - residential 760,099 14,040 (803) — 773,336 Mortgage-backed securities - commercial 20,226 1,362 — — 21,588 States and political subdivisions 336,543 19,806 (20) — 356,329 U.S. Treasury securities 16,480 148 — — 16,628 Corporate securities 2,500 17 (1) — 2,516 Total $ 1,137,848 $ 35,376 $ (824) $ — $ 1,172,400 December 31, 2019 Amortized cost Gross unrealized gains Gross unrealized losses Fair Value Investment Securities Available-for-sale debt securities Mortgage-backed securities - residential $ 474,144 $ 4,829 $ (1,661) $ 477,312 Mortgage-backed securities - commercial 12,957 407 — 13,364 States and political subdivisions 181,178 8,287 (230) 189,235 U.S. Treasury securities 7,426 22 — 7,448 Corporate securities 1,000 22 — 1,022 Total $ 676,705 $ 13,567 $ (1,891) $ 688,381 The components of amortized cost for debt securities on the consolidated balance sheets excludes accrued interest receivable since the Company elected to present accrued interest receivable separately on the consolidated balance sheets. As of December 31, 2020 and 2019, total accrued interest receivable on debt securities was $4,540 and $2,843, respectively. As of December 31, 2020 and 2019, the Company had $4,591 and $3,295, respectively, in marketable equity securities recorded at fair value, respectively. Securities pledged at December 31, 2020 and 2019 had carrying amounts of $804,821 and $373,674, respectively, and were pledged to secure a Federal Reserve Bank line of credit, public deposits and repurchase agreements. There were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of shareholders' equity during any period presented. At December 31, 2020 and December 31, 2019, there were no trade date payables that related to purchases settled after period end. The amortized cost and fair value of debt securities by contractual maturity at December 31, 2020 and December 31, 2019 are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgage underlying the security may be called or repaid without any penalties. Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary. December 31, December 31, 2020 2019 Available-for-sale Available-for-sale Amortized cost Fair value Amortized cost Fair value Due in one year or less $ 35,486 $ 35,662 $ 1,148 $ 1,152 Due in one to five years 24,278 24,684 11,553 11,676 Due in five to ten years 40,038 41,332 18,287 18,887 Due in over ten years 257,721 275,798 158,616 165,990 357,523 377,476 189,604 197,705 Mortgage-backed securities - residential 760,099 773,336 474,144 477,312 Mortgage-backed securities - commercial 20,226 21,588 12,957 13,364 Total debt securities $ 1,137,848 $ 1,172,400 $ 676,705 $ 688,381 Sales and other dispositions of available-for-sale securities were as follows: Year Ended December 31, 2020 2019 2018 Proceeds from sales $ 146,494 $ 24,498 $ 2,742 Proceeds from maturities, prepayments and calls 220,549 113,018 73,066 Gross realized gains 1,606 7 9 Gross realized losses 271 98 44 Additionally, net unrealized gains on equity securities of $296 and $148 were recognized in the years ended December 31, 2020 and 2019, respectively. The following tables show gross unrealized losses for which an allowance for credit losses has not been recorded at December 31, 2020 and December 31, 2019, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position: December 31, 2020 Less than 12 months 12 months or more Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss U.S. government agency securities $ — $ — $ — $ — $ — $ — Mortgage-backed securities - residential 182,012 (803) — — 182,012 (803) States and political subdivisions 3,184 (20) — — 3,184 (20) Corporate securities 499 (1) — — 499 (1) Total $ 185,695 $ (824) $ — $ — $ 185,695 $ (824) December 31, 2019 Less than 12 months 12 months or more Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized loss Mortgage-backed securities - residential $ 47,641 $ (164) $ 175,730 $ (1,497) $ 223,371 $ (1,661) States and political subdivisions 15,433 (230) — — 15,433 (230) Total $ 63,074 $ (394) $ 175,730 $ (1,497) $ 238,804 $ (1,891) As of December 31, 2020 and December 31, 2019, the Company’s securities portfolio consisted of 514 and 365 securities, 16 and 58 of which were in an unrealized loss position, respectively. As of December 31, 2020, Company evaluated available-for-sale debt securities with unrealized losses for expected credit loss and recorded no allowance for credit loss as the majority of the investment portfolio was either government guaranteed or an issuance of a government sponsored entity, was highly rated by major credit rating agencies and have a long history of zero losses. As such, no provision for credit losses was recorded during the year ended December 31, 2020.

Loans and Allowance for credit

Loans and Allowance for credit Losses	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Loans and allowance for credit losses	Loans and allowance for credit losses: Loans outstanding at December 31, 2020 and 2019, by class of financing receivable are as follows: December 31, December 31, 2020 2019 Commercial and industrial (1) $ 1,346,122 $ 1,034,036 Construction 1,222,220 551,101 Residential real estate: 1-to-4 family mortgage 1,089,270 710,454 Residential line of credit 408,211 221,530 Multi-family mortgage 175,676 69,429 Commercial real estate: Owner occupied 924,841 630,270 Non-owner occupied 1,598,979 920,744 Consumer and other 317,640 272,078 Gross loans 7,082,959 4,409,642 Less: Allowance for credit losses (170,389) (31,139) Net loans $ 6,912,570 $ 4,378,503 (1) Includes $212,645 of loans originated as part of the PPP at December 31, 2020, established by the CARES Act, in response to the COVID-19 pandemic. The PPP is administered by the SBA; loans originated as part of the PPP may be forgiven by the SBA under a set of defined rules. PPP loans are federally guaranteed as part of the CARES Act, provided PPP loan recipients receive loan forgiveness under the SBA regulations. As such, there is minimal credit risk associated with these loans. As of December 31, 2020 and December 31, 2019, $1,248,857 and $412,966, respectively, of qualifying residential mortgage loans (including loans held for sale) and $1,532,749 and $545,540, respectively, of qualifying commercial mortgage loans were pledged to the Federal Home Loan Bank of Cincinnati securing advances against the Bank’s line of credit. Additionally, as of December 31, 2020 and December 31, 2019, $2,463,281 and $1,407,662, respectively, of qualifying loans were pledged to the Federal Reserve Bank under the Borrower-in-Custody program. The components of amortized cost for loans on the consolidated balance sheet excludes accrued interest receivable as the Company elected to present accrued interest receivable separately on the balance sheet. As of December 31, 2020, total accrued interest receivable on loans was $38,316. Allowance for Credit Losses As of January 1, 2020, the Company’s policy for the allowance changed with the adoption of CECL. As permitted, the new guidance was implemented using a modified retrospective approach with the impact of the initial adoption being recorded through retained earnings at January 1, 2020, with no restatement of prior periods. Before January 1, 2020, the Company calculated the allowance on an incurred loss approach. As of January 1, 2020, the Company calculated an expected credit loss using a lifetime loss rate methodology. As a result of the difference in methodology between periods, disclosures presented below may not be comparative in nature. The Company utilizes probability-weighted forecasts, which consider multiple macroeconomic variables from a third-party vendor that are applicable to the type of loan. Each of the Company's loss rate models incorporate forward-looking macroeconomic projections throughout the reasonable and supportable forecast period and the subsequent historical reversion at the macroeconomic variable input level. In order to estimate the life of a loan, the contractual term of the loan is adjusted for estimated prepayments based on market information and the Company’s prepayment history. The Company's loss rate models estimate the lifetime loss rate for pools of loans by combining the calculated loss rate based on each variable within the model (including the macroeconomic variables). The lifetime loss rate for the pool is then multiplied by the loan balances to determine the expected credit losses on the pool. The Company considers the need to qualitatively adjust its modeled quantitative expected credit loss estimate for information not already captured in the model loss estimation process. These qualitative factor adjustments may increase or decrease the Company’s estimate of expected credit losses. The Company reviews the qualitative adjustments so as to validate that information that has already been considered and included in the modeled quantitative loss estimation process is not also included in the qualitative adjustment. The Company considers the qualitative factors that are relevant to the institution as of the reporting date, which may include, but are not limited to: levels of and trends in delinquencies and performance of loans; levels of and trends in write-offs and recoveries collected; trends in volume and terms of loans; effects of any changes in reasonable and supportable economic forecasts; effects of any changes in risk selection and underwriting standards; other changes in lending policies, procedures, and practices; experience, ability, and depth of lending management and expertise; available relevant information sources that contradict the Company’s own forecast; effects of changes in prepayment expectations or other factors affecting assessments of loan contractual terms; industry conditions; and effects of changes in credit concentrations. The quantitative models require loan data and macroeconomic variables based on the inherent credit risks in each portfolio to more accurately measure the credit risks associated with each. Each of the quantitative models pools loans with similar risk characteristics and collectively assesses the lifetime loss rate for each pool to estimate its expected credit loss. When a loan no longer shares similar risk characteristics with other loans in any given pool, the loan is individually assessed. The Company has determined the following circumstances in which a loan may require an individual evaluation: collateral dependent loans; loans for which foreclosure is probable; TDRs and reasonably expected TDRs. A loan is deemed collateral dependent when 1) the borrower is experiencing financial difficulty and 2) the repayment is expected to be primarily through sale or operation of the collateral. The allowance for credit losses for collateral dependent loans as well as loans where foreclosure is probable is calculated as the amount for which the loan’s amortized cost basis exceeds fair value. Fair value is determined based on appraisals performed by qualified appraisers and reviewed by qualified personnel. In cases where repayment is to be provided substantially through the sale of collateral, the Company reduces the fair value by the estimated costs to sell. Loans experiencing financial difficulty for which a concession has not yet been provided may be identified as reasonably expected TDRs. Reasonably expected TDRs use the same methodology as TDRs. In cases where the expected credit loss can only be captured through a discounted cash flow analysis (such as an interest rate modification for a TDR loan), the allowance is measured by the amount which the loan’s amortized cost exceeds the discounted cash flow analysis. The allowance for credit losses on a TDR or a reasonably expected TDR is calculated individually using a discounted cash flow methodology, unless the loan is deemed to be collateral dependent or foreclosure is probable. The Company’s acquisitions and changes in reasonable and supportable forecasts of macroeconomic variables, primarily due to the impact of the COVID-19 pandemic, resulted in projected credit deterioration requiring the Company to recognize significant increases in the provision for credit losses during the year ended December 31, 2020. Specifically, the Company performed additional qualitative evaluations by class of financing receivable in line with the Company's established qualitative framework, weighting the impact of the current economic outlook, status of federal government stimulus programs, and other considerations, in order to identify specific industries or borrowers seeing credit improvement or deterioration specific to the COVID-19 pandemic. Loans acquired during the period from Franklin increased the allowance for credit losses by $77,653 as of the August 15, 2020 acquisition date and Farmers National increased the allowance for credit losses by $4,494 as of the February 14, 2020 acquisition date. See Note 2, "Mergers and acquisitions" for additional details related to PCD loans acquired during the year ended December 31, 2020. The following provides the changes in the allowance for credit losses by class of financing receivable for the years ended December 31, 2020, 2019, and 2018: Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Year Ended December 31, 2020 Beginning balance - December 31, 2019 $ 4,805 $ 10,194 $ 3,112 $ 752 $ 544 $ 4,109 $ 4,621 $ 3,002 $ 31,139 Impact of adopting ASC 326 on non-purchased credit deteriorated loans 5,300 1,533 7,920 3,461 340 1,879 6,822 3,633 30,888 Impact of adopting ASC 326 on purchased credit deteriorated loans 82 150 421 (3) — 162 184 (438) 558 Provision for credit losses 13,830 40,807 6,408 5,649 5,506 (1,739) 17,789 6,356 94,606 Recoveries of loans previously charged-off 1,712 205 122 125 — 83 — 756 3,003 Loans charged off (11,735) (18) (403) (22) — (304) (711) (2,112) (15,305) Initial allowance on loans purchased with deteriorated credit quality 754 5,606 1,640 572 784 659 15,442 43 25,500 Ending balance - December 31, 2020 $ 14,748 $ 58,477 $ 19,220 $ 10,534 $ 7,174 $ 4,849 $ 44,147 $ 11,240 $ 170,389 Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Year Ended December 31, 2019 Beginning balance - December 31, 2018 $ 5,348 $ 9,729 $ 3,428 $ 811 $ 566 $ 3,132 $ 4,149 $ 1,769 $ 28,932 Provision for loan losses 2,251 454 (175) 112 (22) 869 484 3,080 7,053 Recoveries of loans previously charged-off 136 11 79 138 — 108 — 634 1,106 Loans charged off (2,930) — (220) (309) — — (12) (2,481) (5,952) Ending balance - December 31, 2019 $ 4,805 $ 10,194 $ 3,112 $ 752 $ 544 $ 4,109 $ 4,621 $ 3,002 $ 31,139 Commercial and industrial Construction 1-to-4 family residential mortgage Residential line of credit Multi-family residential mortgage Commercial real estate owner occupied Commercial real estate non-owner occupied Consumer and Other Total Year Ended December 31, 2018 Beginning balance - $ 4,461 $ 7,135 $ 3,197 $ 944 $ 434 $ 3,558 $ 2,817 $ 1,495 $ 24,041 Provision for loan losses 1,395 1,459 547 (275) 132 (478) 1,281 1,337 5,398 Recoveries of loans 390 1,164 171 178 — 143 51 550 2,647 Loans charged off (898) (29) (138) (36) — (91) — (1,613) (2,805) Adjustments for transfers to loans HFS — — (349) — — — — — (349) Ending balance - $ 5,348 $ 9,729 $ 3,428 $ 811 $ 566 $ 3,132 $ 4,149 $ 1,769 $ 28,932 The following tables provides the amount of the allowance for credit losses by class of financing receivable disaggregated by measurement methodology as of December 31, 2020, 2019 and 2018: December 31, 2020 Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Amount of allowance allocated to: Individually evaluated for credit loss $ 373 $ 95 $ — $ 9 $ — $ 30 $ 1,531 $ 1 $ 2,039 Collectively evaluated for credit loss 13,493 54,065 17,206 10,031 6,326 4,062 33,706 10,516 149,405 Purchased credit deteriorated 882 4,317 2,014 494 848 757 8,910 723 18,945 Ending balance - December 31, 2020 $ 14,748 $ 58,477 $ 19,220 $ 10,534 $ 7,174 $ 4,849 $ 44,147 $ 11,240 $ 170,389 December 31, 2019 Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Amount of allowance allocated to: Individually evaluated for impairment $ 241 $ — $ 8 $ 9 $ — $ 238 $ 399 $ — $ 895 Collectively evaluated for impairment 4,457 10,192 2,940 743 544 3,853 3,909 1,933 28,571 Acquired with deteriorated credit quality 107 2 164 — — 18 313 1,069 1,673 Ending balance - December 31, 2019 $ 4,805 $ 10,194 $ 3,112 $ 752 $ 544 $ 4,109 $ 4,621 $ 3,002 $ 31,139 December 31, 2018 Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Amount of allowance allocated to: Individually evaluated for impairment $ 3 $ — $ 7 $ — $ — $ 53 $ 205 $ — $ 268 Collectively evaluated for impairment 5,247 9,677 3,205 811 566 3,066 3,628 1,583 27,783 Acquired with deteriorated credit quality 98 52 216 — — 13 316 186 881 Ending balance - December 31, 2018 $ 5,348 $ 9,729 $ 3,428 $ 811 $ 566 $ 3,132 $ 4,149 $ 1,769 $ 28,932 The following table provides the amount of loans by class of financing receivable disaggregated by measurement methodology as of December 31, 2020, 2019, and 2018: December 31, 2020 Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Loans, net of unearned income Individually evaluated for credit loss $ 15,578 $ 4,851 $ 848 $ 412 $ — $ 7,846 $ 8,631 $ 39 $ 38,205 Collectively evaluated for credit loss 1,270,058 1,140,634 987,142 387,250 156,447 813,151 1,272,203 302,983 6,329,868 Purchased credit deteriorated 60,486 76,735 101,280 20,549 19,229 103,844 318,145 14,618 714,886 Ending balance - December 31, 2020 $ 1,346,122 $ 1,222,220 $ 1,089,270 $ 408,211 $ 175,676 $ 924,841 $ 1,598,979 $ 317,640 $ 7,082,959 December 31, 2019 Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Loans, net of unearned income Individually evaluated for impairment $ 9,026 $ 2,061 $ 1,347 $ 579 $ — $ 2,993 $ 7,755 $ 49 $ 23,810 Collectively evaluated for impairment 1,023,326 546,156 689,769 220,878 69,429 621,386 902,792 254,944 4,328,680 Acquired with deteriorated credit quality 1,684 2,884 19,338 73 — 5,891 10,197 17,085 57,152 Ending balance - December 31, 2019 $ 1,034,036 $ 551,101 $ 710,454 $ 221,530 $ 69,429 $ 630,270 $ 920,744 $ 272,078 $ 4,409,642 December 31, 2018 Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Loans, net of unearned income Individually evaluated for impairment $ 1,847 $ 1,221 $ 987 $ 245 $ — $ 2,608 $ 6,735 $ 73 $ 13,716 Collectively evaluated for impairment 863,788 549,075 535,451 190,235 75,457 484,900 677,247 208,643 3,584,796 Acquired with deteriorated credit quality 1,448 5,755 19,377 — — 6,016 16,266 20,137 68,999 Ending balance - December 31, 2018 $ 867,083 $ 556,051 $ 555,815 $ 190,480 $ 75,457 $ 493,524 $ 700,248 $ 228,853 $ 3,667,511 Credit Quality The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Company analyzes loans that share similar risk characteristics collectively. Loans that do not share similar risk characteristics are evaluated individually. The Company uses the following definitions for risk ratings: Pass. Loans rated Pass include those that are adequately performing and collateralized and which management believes do not have conditions that have occurred or may occur that would result in the loan being downgraded into an inferior category. Watch. Loans rated as Watch include those that management believes have conditions that have occurred, or may occur, which could result in the loan being downgraded to an inferior category. Also included in watch are loans rated as special mention, which have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date. Substandard. Loans rated as Substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so rated have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. Doubtful. Loans classified as Doubtful have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. Risk ratings are updated on an ongoing basis and are subject to change by continuous loan monitoring processes. The following table presents the credit quality of our loan portfolio by year of origination as of December 31, 2020. Revolving loans are presented separately. Management considers the guidance in ASC 310-20 when determining whether a modification, extension, or renewal constitutes a current period origination. Generally, current period renewals of credit are reunderwritten at the point of renewal and considered current period originations for the purposes of the table below. As of December 31, Term Loans Amortized Cost Basis by Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Commercial and industrial Pass $ 335,519 $ 183,905 $ 64,897 $ 56,598 $ 30,641 $ 40,964 $ 525,885 $ 1,238,409 Watch 3,786 2,555 6,213 3,764 7,847 4,301 39,901 68,367 Substandard 2,467 2,688 11,227 4,403 6,582 1,277 10,502 39,146 Doubtful 34 — — 22 — — 144 200 Total 341,806 189,148 82,337 64,787 45,070 46,542 576,432 1,346,122 Construction Pass 460,232 387,759 78,319 40,777 40,386 59,344 112,004 1,178,821 Watch 1,952 4,169 10,368 13,386 1,250 3,559 — 34,684 Substandard 573 1,755 3,178 129 — 3,068 — 8,703 Doubtful — — — 12 — — — 12 Total 462,757 393,683 91,865 54,304 41,636 65,971 112,004 1,222,220 Residential real estate: 1-to-4 family mortgage Pass 282,747 176,374 159,036 147,816 107,911 152,027 — 1,025,911 Watch 1,783 2,166 6,672 10,668 4,004 13,889 — 39,182 Substandard 448 1,422 3,787 5,473 3,418 9,043 — 23,591 Doubtful — 6 19 — 204 357 — 586 Total 284,978 179,968 169,514 163,957 115,537 175,316 — 1,089,270 Residential line of credit Pass — — — — — — 396,348 396,348 Watch — — — — — — 6,511 6,511 Substandard — — — — — — 4,756 4,756 Doubtful — — — — — — 596 596 Total — — — — — — 408,211 408,211 Multi-family mortgage Pass 29,006 13,446 11,843 46,561 28,330 35,339 11,094 175,619 Watch — — — — — — — — Substandard — — — — — 57.00 — 57 Doubtful — — — — — — — — Total 29,006 13,446 11,843 46,561 28,330 35,396 11,094 175,676 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Commercial real estate: Owner occupied Pass 133,046 174,965 95,182 89,214 76,539 208,013 51,264 828,223 Watch 8,825 5,891 6,646 21,618 6,101 18,561 2,417 70,059 Substandard 44 1,785 2,423 6,074 274 11,226 4,733 26,559 Doubtful — — — — — — — — Total 141,915 182,641 104,251 116,906 82,914 237,800 58,414 924,841 Non-owner occupied Pass 166,962 222,238 324,848 193,496 264,820 237,933 37,787 1,448,084 Watch — 8,704 24,464 27,653 25,550 42,696 1,033 130,100 Substandard — 2,210 1,502 — — 17,083 — 20,795 Doubtful — — — — — — — — Total 166,962 233,152 350,814 221,149 290,370 297,712 38,820 1,598,979 Consumer and other loans Pass 89,625 52,725 39,420 26,172 40,980 31,063 14,816 294,801 Watch 281 911 1,893 1,497 3,049 7,974 12 15,617 Substandard 96 131 867 881 779 2,044 668 5,466 Doubtful 55 434 567 280 156 264 — 1,756 Total 90,057 54,201 42,747 28,830 44,964 41,345 15,496 317,640 Total Pass 1,497,137 1,211,412 773,545 600,634 589,607 764,683 1,149,198 6,586,216 Watch 16,627 24,396 56,256 78,586 47,801 90,980 49,874 364,520 Substandard 3,628 9,991 22,984 16,960 11,053 43,798 20,659 129,073 Doubtful 89 440 586 314 360 621 740 3,150 Total $ 1,517,481 $ 1,246,239 $ 853,371 $ 696,494 $ 648,821 $ 900,082 $ 1,220,471 $ 7,082,959 The following disclosures are presented in accordance with GAAP in effect prior to the adoption of CECL. The Company has included these disclosures to address the applicable prior periods presented. The following table shows credit quality indicators by class of financing receivable at December 31, 2019. December 31, 2019 Pass Watch Substandard Total Loans, excluding purchased credit impaired loans Commercial and industrial $ 946,247 $ 66,910 $ 19,195 $ 1,032,352 Construction 541,201 4,790 2,226 548,217 Residential real estate: 1-to-4 family mortgage 666,177 11,380 13,559 691,116 Residential line of credit 218,086 1,343 2,028 221,457 Multi-family mortgage 69,366 63 — 69,429 Commercial real estate: Owner occupied 576,737 30,379 17,263 624,379 Non-owner occupied 876,670 24,342 9,535 910,547 Consumer and other 248,632 3,304 3,057 254,993 Total loans, excluding purchased credit impaired loans $ 4,143,116 $ 142,511 $ 66,863 $ 4,352,490 Purchased credit impaired loans Commercial and industrial $ — $ 1,224 $ 460 $ 1,684 Construction — 2,681 203 2,884 Residential real estate: 1-to-4 family mortgage — 15,091 4,247 19,338 Residential line of credit — — 73 73 Multi-family mortgage — — — — Commercial real estate: Owner occupied — 4,535 1,356 5,891 Non-owner occupied — 6,617 3,580 10,197 Consumer and other — 13,521 3,564 17,085 Total purchased credit impaired loans — 43,669 13,483 57,152 Total loans $ 4,143,116 $ 186,180 $ 80,346 $ 4,409,642 Nonaccrual and Past Due Loans Nonperforming loans include loans that are no longer accruing interest (nonaccrual loans) and loans past due ninety or more days and still accruing interest. The following tables provide information on nonaccrual and past due loans as of December 31, 2020 and December 31, 2019. For December 31, 2019, purchased credit impaired ("PCI") loans are not included in the nonperforming disclosures as these loans are considered to be performing, even though they may be contractually past due. This is because any non-payment of contractual principal or interest was considered in the periodic re-estimation of expected cash flows and was included in the 2019 loan loss provision or future period yield adjustments. Under PCD accounting, management considers changes in the credit quality of the borrower as part of its regular estimation of expected credit losses and does not make the same future yield adjustments as under the PCI accounting. Consequently, PCD loans that are contractually past due or on nonaccrual status, including those formerly accounted for as PCI loans, are included in the December 31, 2020 nonperforming disclosures. The following table represents an analysis of the aging by class of financing receivable as of December 31, 2020: December 31, 2020 30-89 days 90 days or Non-accrual Loans current Total Commercial and industrial $ 3,297 $ 330 $ 16,005 $ 1,326,490 $ 1,346,122 Construction 7,607 573 4,053 1,209,987 1,222,220 Residential real estate: 1-to-4 family mortgage 7,058 10,470 5,923 1,065,819 1,089,270 Residential line of credit 3,551 239 1,757 402,664 408,211 Multi-family mortgage — 57 — 175,619 175,676 Commercial real estate: Owner occupied 98 — 7,948 916,795 924,841 Non-owner occupied 915 — 12,471 1,585,593 1,598,979 Consumer and other 4,469 2,027 2,603 308,541 317,640 Total $ 26,995 $ 13,696 $ 50,760 $ 6,991,508 $ 7,082,959 The following tables provide the amortized cost basis of loans on non-accrual status, as well as any related allowance and interest income, by class of financing receivable as of or for the year ended December 31, 2020: u End of period amortized cost Beginning of Non-accrual Non-accrual Related Year to date Interest Income Commercial and industrial $ 5,586 $ 13,960 $ 2,045 $ 383 $ 325 Construction 1,254 3,061 992 131 69 Residential real estate: 1-to-4 family mortgage 4,585 3,048 2,875 84 22 Residential line of credit 489 854 903 31 72 Commercial real estate: Owner occupied 2,285 7,172 776 63 89 Non-owner occupied 9,460 4,566 7,905 1,711 215 Consumer and other 1,623 — 2,603 147 24 Total $ 25,282 $ 32,661 $ 18,099 $ 2,550 $ 816 The following disclosures are presented in accordance with GAAP in effect prior to the adoption of CECL. The Company has included these disclosures to address the applicable prior periods presented. The following table provides the period-end amounts of loans that are past due, loans not accruing interest and loans current on payments accruing interest by category at December 31, 2019: December 31, 2019 30-89 days 90 days or Non-accrual Purchased Credit Loans current on payments and accruing interest Total Commercial and industrial $ 1,918 $ 291 $ 5,587 $ 1,684 $ 1,024,556 $ 1,034,036 Construction 1,021 42 1,087 2,884 546,067 551,101 Residential real estate: 1-to-4 family mortgage 10,738 3,965 3,332 19,338 673,081 710,454 Residential line of credit 658 412 416 73 219,971 221,530 Multi-family mortgage 63 — — — 69,366 69,429 Commercial real estate: Owner occupied 1,375 — 1,793 5,891 621,211 630,270 Non-owner occupied 327 — 7,880 10,197 902,340 920,744 Consumer and other 2,377 833 967 17,085 250,816 272,078 Total $ 18,477 $ 5,543 $ 21,062 $ 57,152 $ 4,307,408 $ 4,409,642 Impaired Loans The following disclosures are presented in accordance with GAAP in effect prior to the adoption of CECL. The Company has included these disclosures to address the applicable prior periods presented. Impaired loans recognized in conformity with ASC 310 at December 31, 2019 segregated by class, were as follows: December 31, 2019 Recorded Unpaid Related With a related allowance recorded: Commercial and industrial $ 6,080 $ 8,350 $ 241 Residential real estate: 1-to-4 family mortgage 264 324 8 Residential line of credit 320 320 9 Commercial real estate: Owner occupied 756 1,140 238 Non-owner occupied 6,706 6,747 399 Total $ 14,126 $ 16,881 $ 895 With no related allowance recorded: Commercial and industrial $ 2,946 $ 3,074 $ — Construction 2,061 2,499 — Residential real estate: 1-to-4 family mortgage 1,083 1,449 — Residential line of credit 259 280 — Commercial real estate: Owner occupied 2,237 2,627 — Non-owner occupied 1,049 1,781 — Consumer and other 49 49 — Total $ 9,684 $ 11,759 $ — Total impaired loans $ 23,810 $ 28,640 $ 895 Average recorded investment and interest income on a cash basis recognized during the years ended December 31, 2019, and 2018 on impaired loans, segregated by class, were as follows: December 31, 2019 2018 Average recorded investment Interest income recognized (cash basis) Average recorded investment Interest income recognized (cash basis) With a related allowance recorded: Commercial and industrial $ 3,349 $ 474 $ 335 $ 121 Residential real estate: 1-to-4 family mortgage 205 13 170 9 Commercial real estate: Owner occupied 658 27 702 43 Non-owner occupied 6,196 109 2,915 2 Consumer and other — — — — Total $ 10,568 $ 624 $ 4,122 $ 175 With no related allowance recorded: Commercial and industrial $ 2,088 $ 201 $ 1,377 $ 70 Construction 1,641 167 1,255 74 Residential real estate: 1-to-4 family mortgage 963 68 955 74 Residential line of credit 252 1 123 15 Commercial real estate: Owner occupied 2,143 133 1,862 148 Non-owner occupied 1,049 — 1,313 7 Consumer and other 61 5 49 4 Total $ 8,197 $ 575 $ 7,423 $ 418 Total impaired loans $ 18,765 $ 1,199 $ 11,545 $ 593 Purchased Credit Impaired Loans The following disclosures are presented in accordance with GAAP in effect prior to the adoption of CECL. The Company has included these disclosures to address the applicable prior periods presented. As of December 31, 2019 and 2018, the carrying value of PCI loans accounted for under ASC 310-30 "Loans and Debt Securities Acquired with Deteriorated Credit Quality" was $57,152 and $68,999. The following table presents changes in the value of the accretable yield for PCI loans for the periods indicated. Year Ended December 31, 2019 2018 Balance at the beginning of period $ (16,587) $ (17,682) Additions through business combinations (1,167) — Principal reductions and other reclassifications from nonaccretable difference 61 (4,047) Accretion 7,003 9,010 Changes in expected cash flows (360) (3,868) Balance at end of period $ (11,050) $ (16,587) Included in the ending balance of the accretable yield on PCI loans at December 31, 2019 and 2018, was a purchase accounting liquidity discount of $292 and $2,436, respectively. There was also a purchase accounting nonaccretable credit discount of $3,537 and $4,355 related to the PCI loan portfolio at December 31, 2019 and 2018, and an accretable credit and liquidity discount on non-PCI loans of $8,964 and $3,924 as of December 31, 2019 and $7,527 and $2,197, respectively, as of December 31, 2018. Interest revenue, through accretion of the difference between the recorded investment of the loans and the expected cash flows, was recognized on all PCI loans. Accretion of interest income amounting to $7,003 and $9,010 was recognized on PCI loans during the years ended December 31, 2019 and 2018, respectively. This included both the contractual interest income recognized and the purchase accounting contribution through accretion of the liquidity discount for changes in estimated cash flows. The total purchase accounting contribution through accretion excluding contractual interest collected for all purchased loans was $8,556 and $7,608 for the years ended December 31, 2019 and 2018, respectively As of December 31, 2020 and December 31, 2019, the Company has a recorded investment in TDRs of $15,988 and $12,206, respectively. The modifications included extensions of the maturity date and/or a stated rate of interest to one lower than the current market rate to borrowers experiencing financial difficulty. The Company has calculated $310 and $360 of specific reserves for those loans at December 31, 2020 and December 31, 2019, respectively. There were no commitments to lend any additional amounts to these customers for either period end. Of these loans, $8,279 and $5,201 were classified as non-accrual loans as of December 31, 2020 and December 31, 2019, respectively. The following tables present the financial effect of TDRs recorded during the periods indicated. Year Ended December 31, 2020 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial and industrial 5 $ 2,257 $ 2,257 $ — Commercial real estate: Owner occupied 7 2,794 2,794 — Non-owner occupied 2 3,752 3,752 $ — Residential real estate: 1-to-4 family mortgage 3 618 618 — Residential line of credit 1 95 95 — Total 18 $ 9,516 $ 9,516 $ — Year Ended December 31, 2019 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial and industrial 3 $ 3,204 $ 3,204 $ — Construction 2 1,085 1,085 — Commercial real estate: Owner occupied 2 1,494 1,495 — Non-owner occupied 1 1,366 1,366 106 Residential real estate: 1-4 family mortgage 2 175 175 — Residential line of credit 2 333 333 9 Total 12 $ 7,657 $ 7,658 $ 115 Year Ended December 31, 2018 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial and industrial 2 $ 887 $ 887 $ — Commercial real estate: Owner occupied 1 143 143 — Residential real estate: 1-4 family mortgage 1 249 249 — Consumer and other 5 61 61 — Total 9 $ 1,340 $ 1,340 $ — There were no loans modified as troubled debt restructurings for which there was a payment default within twelve months following the modification during the years ended December 31, 2020, 2019, and 2018. A loan is considered to be in payment default once it is 90 days contractually past due under the modified terms. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. This evaluation is performed under the Company’s internal underwriting policy. The terms of certain other loans were modified during the years ended December 31, 2020, 2019 and 2018 that did not meet the definition of a TDR. The modification of these loans usually involve either a modification of the terms of a loan to borrowers who are not experiencing financial difficulties or an insignificant delay in payments. Collateral Dependent Loans For loans for which the repayment (based on the Company's assessment) is expected to be provided substantially through the operation or sale of collateral and the borrower is experiencing financial difficulty, the following table presents the loans and the corresponding individually assessed allowance for credit losses by class of financing receivable. December 31, 2020 Type of Collateral Real Estate Financial Assets and Equipment Individually assessed allowance for credit loss Commercial and industrial $ — $ 1,728 $ 117 Construction 3,877 — — Residential real estate: 1-to-4 family mortgage 226 — — Residential line of credit 1,174 — 9 Multi-family mortgage — — — Commercial real estate: Owner occupied 3,391 — 30 Non-owner occupied 8,164 — 1,531 Consumer and other — — — Total $ 16,832 $ 1,728 $ 1,687 Defe

Loans held for sale

Loans held for sale	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Loans held for sale	Loans held for sale: Loans held for sale are recorded at fair value, and consist primarily of residential mortgage loans originated to be sold in the secondary market. During the year ended December 31, 2020, the Company acquired a portfolio of commercial loans, including shared national credits and institutional healthcare loans, as part of the Franklin transaction that the Company elected to account for as held for sale. As such, these loans are excluded from the allowance for credit losses. Instead, the loans are recorded at fair value with subsequent changes to fair value recognized in earnings. During the year ended December 31, 2020, the Company recorded gains of $3,228 in other noninterest income related to changes in fair value of this portfolio. The following table summarizes loans held for sale, at fair value, as of the periods presented: December 31, December 31, 2020 2019 Commercial and industrial $ 215,403 $ — Residential real estate: 1-4 family mortgage 683,770 262,518 Total loans held for sale, at fair value $ 899,173 $ 262,518

Premises and equipment

Premises and equipment	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Premises and equipment	Premises and equipment: Premises and equipment and related accumulated depreciation as of December 31, 2020 and 2019, are as follows: 2020 2019 Land $ 33,151 $ 26,283 Premises 108,579 65,569 Furniture and fixtures 26,729 23,545 Leasehold improvements 18,429 12,989 Equipment 16,904 15,575 Construction in process 1,501 800 Finance lease 1,588 — 206,881 144,761 Less: accumulated depreciation and amortization (61,766) (54,630) Total Premises and Equipment $ 145,115 $ 90,131 Depreciation and amortization expense was $7,009, $5,176 and $4,334 for the years ended December 31, 2020, 2019 and 2018, respectively.

Other real estate owned

Other real estate owned	12 Months Ended
	Dec. 31, 2020
Real Estate [Abstract]
Other real estate owned	Other real estate owned The amount reported as other real estate owned includes property acquired through foreclosure in addition to excess facilities held for sale and is carried at fair value less estimated cost to sell the property. The following table summarizes the other real estate owned for the year ended December 31, 2020, 2019, and 2018: Year Ended December 31, 2020 2019 2018 Balance at beginning of period $ 18,939 $ 12,643 $ 16,442 Transfers from loans 2,746 5,487 2,138 Transfers (to) from premises and equipment (841) 4,290 — Proceeds from sale of other real estate owned (6,937) (3,860) (4,819) Gain on sale of other real estate owned 354 1,058 271 Loans provided for sales of other real estate owned (305) (166) (1,019) Write-downs and partial liquidations (1,845) (513) (370) Balance at end of period $ 12,111 $ 18,939 $ 12,643 Foreclosed residential real estate properties totaled $1,890 and $4,295 as of December 31, 2020 and December 31, 2019, respectively. The recorded investment in residential mortgage loans secured by residential real estate properties for which foreclosure proceedings are in process totaled $167 and $82 at December 31, 2020 and December 31, 2019, respectively.

Goodwill and intangible assets

Goodwill and intangible assets	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and intangible assets	Goodwill and intangible assets: Goodwill Balance at December 31, 2018 $ 137,190 Addition from acquisition of Atlantic Capital branches 31,961 Relief of goodwill due to sale of TPO mortgage delivery channel (100) Balance at December 31, 2019 $ 169,051 Balance at December 31, 2019 $ 169,051 Addition from acquisition of Farmers National 6,319 Addition from acquisition of Franklin 67,191 Balance at December 31, 2020 $ 242,561 Goodwill is tested annually, or more often if circumstances warrant, for impairment. Impairment exists when a reporting unit's carrying value exceeds its fair value. As of December 31, 2020, the Company performed a quantitative assessment and determined it was more likely than not that the fair value of the reporting units exceeded its carrying value, including goodwill. As such, no impairment was indicated. The Company performed a qualitative test of goodwill for impairment as of December 31, 2019 and determined there to be no impairment. The Company recorded $100 in relief of goodwill during the year ended December 31, 2019, related to the sale of the TPO mortgage delivery channel. See Note 2, "Mergers & Acquisitions" for information on the calculation of goodwill for each of our mergers and acquisitions. Core deposit and other intangibles include core deposit intangibles, customer base trust intangible and manufactured housing servicing intangible. The composition of core deposit and other intangibles as of December 31, 2020 and December 31, 2019 is as follows: Core deposit and other intangibles Gross Carrying Amount Accumulated Amortization Net Carrying Amount December 31, 2020 Core deposit intangible $ 59,835 $ (38,807) $ 21,028 Customer base trust intangible 1,600 (547) 1,053 Manufactured housing servicing intangible 1,088 (743) 345 Total core deposit and other intangibles $ 62,523 $ (40,097) $ 22,426 December 31, 2019 Core deposit intangible $ 49,675 $ (33,861) $ 15,814 Customer base trust intangible 1,600 (387) 1,213 Manufactured housing servicing intangible 1,088 (526) 562 Total core deposit and other intangibles $ 52,363 $ (34,774) $ 17,589 During the first quarter of 2020, the Company recorded $2,490 of core deposit intangibles resulting from the Farmers National acquisition, which is being amortized over a weighted average life of approximately 4 years. During the third quarter of 2020, the Company recorded $7,670 of core deposit intangibles resulting from the Franklin merger, which is being amortized over a weighted average life of approximately 4 years. The estimated aggregate future amortization expense of core deposit and other intangibles is as follows: 2021 $ 5,477 2022 4,586 2023 3,658 2024 2,946 2025 2,306 Thereafter 3,453 $ 22,426

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Leases	Leases: On January 1, 2019, the Company adopted ASU 2016-02 "Leases" (Topic 842) and all subsequent updates that modified Topic 842. For the Company, the adoption primarily affected the accounting treatment for operating lease agreements in which the Company is the lessee. Substantially all the leases for which the Company is the lessee are comprised of real estate for branches, mortgage, and operations locations. As of December 31, 2020, the Company was the lessee in 58 operating leases and 1 finance lease of certain branch, mortgage and operations locations, of which 49 operating leases and 1 finance lease currently have remaining terms varying from greater than one year to 35 years. Leases with initial terms of less than one year are not recorded on the consolidated balance sheets. The Company also does not include equipment leases and leases in which the Company is the lessor on the consolidated balance sheets as these are insignificant. Many leases include one or more options to renew, with renewal terms that can extend the lease up to an additional 20 years or more. Certain lease agreements contain provisions to periodically adjust rental payments for inflation. Renewal options that management is reasonably certain to renew and fixed rent escalations are included in the right-of-use ("ROU") asset and lease liability. During the year ended December 31, 2020, the Company recorded $23,972 in ROU assets and liabilities for operating leases assumed in the Franklin and FNB transactions. Additionally, the Company also assumed a finance lease in the Franklin transaction amounting to $1,630 included in premises and equipment and borrowings on the consolidated balance sheets. During the year ended December 31, 2020, the Company entered into a lease for a new corporate headquarters building located in downtown Nashville. The building is currently under construction and anticipated to be completed in late 2022. Upon commencement, the Company estimates recording a ROU asset and operating lease liability of approximately $29,000 and $30,000, respectively, in connection with this lease. Information related to the Company's leases is presented below: December 31, Classification 2020 2019 Right-of-use assets: Operating leases Operating lease right-of-use assets $ 49,537 $ 32,539 Finance leases Premises and equipment, net 1,588 — Total right-of-use assets $ 51,125 $ 32,539 Lease liabilities: Operating leases Operating lease liabilities $ 55,187 $ 35,525 Finance leases Borrowings 1,598 — Total lease liabilities $ 56,785 $ 35,525 Weighted average remaining lease term (in years) - operating 12.2 14.1 Weighted average remaining lease term (in years) - finance 14.4 0.0 Weighted average discount rate - operating 2.65 % 3.44 % Weighted average discount rate - finance 1.76 % — % The components of total lease expense included in the consolidated statements of income were as follows: Year Ended December 31, Classification 2020 2019 Operating lease costs Amortization of right-of-use asset Occupancy and equipment $ 6,228 $ 5,057 Short-term lease cost Occupancy and equipment 456 365 Variable lease cost Occupancy and equipment 602 682 Finance lease costs Interest on lease liabilities Interest expense on borrowings 11 — Amortization of right-of-use asset Occupancy and equipment 43 — Lease impairment Merger costs 2,142 — Total lease cost $ 9,482 $ 6,104 The Company does not separate lease and non-lease components and instead elects to account for them as a single lease component. Variable lease cost primarily represents variable payments such as common area maintenance, utilities, and property taxes. Prior to the adoption of ASU 2016-02 on January 1, 2019, lease expense and amortization of a favorable lease intangible included in occupancy and equipment expense during the year ended December 31, 2018 amounted to $5,019 and $90, respectively. A maturity analysis of operating and finance lease liabilities and a reconciliation of undiscounted cash flows to the total lease liability as of December 31, 2020 is as follows: Operating Finance Leases Leases Lease payments due: December 31, 2021 $ 8,042 $ 115 December 31, 2022 7,693 116 December 31, 2023 6,302 118 December 31, 2024 5,625 120 December 31, 2025 4,972 121 Thereafter 34,053 1,225 Total undiscounted future minimum lease payments 66,687 1,815 Less: imputed interest (11,500) (217) Net lease liability $ 55,187 $ 1,598
Leases	Leases: On January 1, 2019, the Company adopted ASU 2016-02 "Leases" (Topic 842) and all subsequent updates that modified Topic 842. For the Company, the adoption primarily affected the accounting treatment for operating lease agreements in which the Company is the lessee. Substantially all the leases for which the Company is the lessee are comprised of real estate for branches, mortgage, and operations locations. As of December 31, 2020, the Company was the lessee in 58 operating leases and 1 finance lease of certain branch, mortgage and operations locations, of which 49 operating leases and 1 finance lease currently have remaining terms varying from greater than one year to 35 years. Leases with initial terms of less than one year are not recorded on the consolidated balance sheets. The Company also does not include equipment leases and leases in which the Company is the lessor on the consolidated balance sheets as these are insignificant. Many leases include one or more options to renew, with renewal terms that can extend the lease up to an additional 20 years or more. Certain lease agreements contain provisions to periodically adjust rental payments for inflation. Renewal options that management is reasonably certain to renew and fixed rent escalations are included in the right-of-use ("ROU") asset and lease liability. During the year ended December 31, 2020, the Company recorded $23,972 in ROU assets and liabilities for operating leases assumed in the Franklin and FNB transactions. Additionally, the Company also assumed a finance lease in the Franklin transaction amounting to $1,630 included in premises and equipment and borrowings on the consolidated balance sheets. During the year ended December 31, 2020, the Company entered into a lease for a new corporate headquarters building located in downtown Nashville. The building is currently under construction and anticipated to be completed in late 2022. Upon commencement, the Company estimates recording a ROU asset and operating lease liability of approximately $29,000 and $30,000, respectively, in connection with this lease. Information related to the Company's leases is presented below: December 31, Classification 2020 2019 Right-of-use assets: Operating leases Operating lease right-of-use assets $ 49,537 $ 32,539 Finance leases Premises and equipment, net 1,588 — Total right-of-use assets $ 51,125 $ 32,539 Lease liabilities: Operating leases Operating lease liabilities $ 55,187 $ 35,525 Finance leases Borrowings 1,598 — Total lease liabilities $ 56,785 $ 35,525 Weighted average remaining lease term (in years) - operating 12.2 14.1 Weighted average remaining lease term (in years) - finance 14.4 0.0 Weighted average discount rate - operating 2.65 % 3.44 % Weighted average discount rate - finance 1.76 % — % The components of total lease expense included in the consolidated statements of income were as follows: Year Ended December 31, Classification 2020 2019 Operating lease costs Amortization of right-of-use asset Occupancy and equipment $ 6,228 $ 5,057 Short-term lease cost Occupancy and equipment 456 365 Variable lease cost Occupancy and equipment 602 682 Finance lease costs Interest on lease liabilities Interest expense on borrowings 11 — Amortization of right-of-use asset Occupancy and equipment 43 — Lease impairment Merger costs 2,142 — Total lease cost $ 9,482 $ 6,104 The Company does not separate lease and non-lease components and instead elects to account for them as a single lease component. Variable lease cost primarily represents variable payments such as common area maintenance, utilities, and property taxes. Prior to the adoption of ASU 2016-02 on January 1, 2019, lease expense and amortization of a favorable lease intangible included in occupancy and equipment expense during the year ended December 31, 2018 amounted to $5,019 and $90, respectively. A maturity analysis of operating and finance lease liabilities and a reconciliation of undiscounted cash flows to the total lease liability as of December 31, 2020 is as follows: Operating Finance Leases Leases Lease payments due: December 31, 2021 $ 8,042 $ 115 December 31, 2022 7,693 116 December 31, 2023 6,302 118 December 31, 2024 5,625 120 December 31, 2025 4,972 121 Thereafter 34,053 1,225 Total undiscounted future minimum lease payments 66,687 1,815 Less: imputed interest (11,500) (217) Net lease liability $ 55,187 $ 1,598

Mortgage servicing rights

Mortgage servicing rights	12 Months Ended
	Dec. 31, 2020
Transfers and Servicing of Financial Assets [Abstract]
Mortgage servicing rights	Mortgage servicing rights: Changes in the Company’s mortgage servicing rights were as follows for the years ended December 31, 2020, 2019, and 2018: Year Ended December 31, 2020 2019 2018 Carrying value at beginning of period $ 75,521 $ 88,829 76,107 Capitalization 47,025 42,151 54,913 Mortgage servicing rights acquired from Franklin, at fair value 5,111 — Sales — (29,160) (39,428) Change in fair value: Due to pay-offs/pay-downs (27,834) (16,350) (11,062) Due to change in valuation inputs or assumptions (19,826) (9,949) 8,299 Carrying value at end of period $ 79,997 $ 75,521 $ 88,829 The following table summarizes servicing income and expense, which are included in 'Mortgage banking income' and 'Other noninterest expense', respectively, within the Mortgage segment operating results for the years ended December 31, 2020, 2019, and 2018: Year Ended December 31, 2020 2019 2018 Servicing income: Servicing income $ 22,128 $ 17,677 $ 20,591 Change in fair value of mortgage servicing rights (47,660) (26,299) (2,763) Change in fair value of derivative hedging instruments 13,286 9,310 (5,910) Servicing income (12,246) 688 11,918 Servicing expenses 7,890 6,832 7,675 Net servicing (loss) income (1) $ (20,136) $ (6,144) $ 4,243 (1) Excludes benefit of custodial service related noninterest-bearing deposits held by the Bank. Data and key economic assumptions related to the Company’s mortgage servicing rights as of December 31, 2020 and 2019 are as follows: December 31, 2020 2019 Unpaid principal balance $ 9,787,657 $ 6,734,496 Weighted-average prepayment speed (CPR) 14.07 % 10.05 % Estimated impact on fair value of a 10% increase $ (4,493) $ (2,839) Estimated impact on fair value of a 20% increase $ (8,599) $ (5,474) Discount rate 11.49 % 9.68 % Estimated impact on fair value of a 100 bp increase $ (2,942) $ (3,086) Estimated impact on fair value of a 200 bp increase $ (5,674) $ (5,932) Weighted-average coupon interest rate 3.58 % 4.20 % Weighted-average servicing fee (basis points) 28 29 Weighted-average remaining maturity (in months) 328 335 The Company hedges the mortgage servicing rights portfolio with various derivative instruments to offset changes in the fair value of the related mortgage servicing rights. See Note 18, "Derivatives" for additional information on these hedging instruments.-* During the years ended December 31, 2019 and 2018, the Company sold $29,160 and $39,428, of mortgage servicing rights on $2,034,374 and $3,181,483 of serviced mortgage loans, respectively. There was not a significant gain or loss recognized in connection with the sales. During the year ended December 31, 2020, there were no such transactions. As of December 31, 2020 and 2019, mortgage escrow deposits totaled to $147,957 and $92,610, respectively.

Other assets and other liabilit

Other assets and other liabilities	12 Months Ended
	Dec. 31, 2020
Other Assets And Other Liabilities [Abstract]
Other assets and other liabilities	Other assets and other liabilities: Included in other assets are: As of December 31, Other assets 2020 2019 Cash surrender value on bank owned life insurance $ 71,977 $ 11,357 Prepaid expenses 5,328 4,575 Software 1,147 1,999 Mortgage lending receivable 8,716 10,765 Derivatives (See Note 18) 68,938 21,981 Deferred tax asset (See Note 15) 16,396 — FHLB lender risk account receivable (See Note 1) 12,729 11,225 Pledged collateral on derivative instruments 57,985 33,616 Other assets 30,900 27,196 Total other assets $ 274,116 $ 122,714 Included in other liabilities are: As of December 31, Other liabilities 2020 2019 Deferred compensation $ 2,261 $ 1,718 Accrued payroll 35,827 16,517 Mortgage buyback reserve 5,928 3,529 Accrued interest 6,772 6,465 Derivatives (See Note 18) 48,242 17,933 Deferred tax liability (See Note 15) — 20,490 FHLB lender risk account guaranty 6,183 5,546 Reserve for unfunded commitments 16,378 — Other liabilities 42,809 15,256 Total other liabilities $ 164,400 $ 87,454

Deposits

Deposits	12 Months Ended
	Dec. 31, 2020
Deposits [Abstract]
Deposits	Deposits: The aggregate amount of time deposits with a minimum denomination greater than $250 was $425,227 and $343,756 at December 31, 2020 and 2019, respectively. At December 31, 2020, the scheduled maturities of time deposits are as follows: Scheduled maturities of time deposits Due on or before: December 31, 2021 $ 1,048,816 December 31, 2022 204,165 December 31, 2023 117,178 December 31, 2024 44,718 December 31, 2025 22,325 Thereafter 52 Total $ 1,437,254 At December 31, 2020 and 2019, the Company had $2,965 and $3,487, respectively, of deposit accounts in overdraft status and thus have been reclassified to loans on the accompanying consolidated balance sheets.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Borrowings	Borrowings: Borrowings include securities sold under agreements to repurchase, lines of credit, Federal Home Loan Bank advances, and subordinated debt. Outstanding Balance Weighted Average Interest Rate December 31, December 31, December 31, December 31, 2020 2019 2020 2019 Securities sold under agreements to repurchase $ 32,199 $ 23,745 0.47 % 0.89 % FHLB advances — 250,000 — % 1.60 % Subordinated debt 189,527 30,930 5.10 % 5.13 % Other borrowings 16,598 — 1.88 % — % $ 238,324 $ 304,675 Securities sold under agreements to repurchase and federal funds purchased Securities sold under agreements to repurchase are financing arrangements that mature daily. The Company enters into agreements with certain customers to sell certain securities under agreements to repurchase the securities the following day. These agreements are made to provide customers with comprehensive treasury management programs and a short-term return for their excess funds. Information concerning securities sold under agreement to repurchase is summarized as follows: December 31, 2020 December 31, 2019 Balance at year end $ 32,199 $ 23,745 Average daily balance during the year 32,912 22,798 Average interest rate during the year 0.61 % 0.84 % Maximum month-end balance during the year $ 40,282 $ 30,273 Weighted average interest rate at year-end 0.47 % 0.89 % The fair value of securities pledged to secure repurchase agreements may decline. The Company manages this risk by having a policy to pledge securities valued at 100% of the outstanding balance of repurchase agreements. The Bank maintains lines with certain correspondent banks that provide borrowing capacity in the form of federal funds purchased in the aggregate amount of $335,000 and $305,000 as of December 31, 2020 and 2019, respectively. There were no borrowings against these available lines at December 31, 2020 or 2019. Federal Home Loan Bank Advances As a member of the FHLB Cincinnati, the Bank receives advances from the FHLB pursuant to the terms of various agreements that assist in funding its mortgage and loan portfolio production. Under these agreements, the Company pledged qualifying loans of $2,781,606 as collateral securing a line of credit with a total borrowing capacity of $1,276,095 as of December 31, 2020. As of December 31, 2019, the Company pledged qualifying loans of $958,506 as collateral securing a line of credit with a total borrowing capacity of $760,607. As of December 31, 2020 and 2019, letters of credit in the amount of $100,000 and $75,000, respectively, were pledged to secure public funds that require collateralization. Additionally, there was an additional line of $800,000 available with the FHLB for overnight borrowings as of both December 31, 2020 and 2019; however additional collateral may be needed to draw on the line. Borrowings against the Company's line totaled $0 and $250,000 as of December 31, 2020 and 2019, respectively. Total borrowings as of December 31, 2019 comprised $150,000 in long-term advances and $100,000 in 90 day fixed rate advances. The long-term advances as of December 31, 2019 contain putable features and are composed of $100,000 and $50,000 with initial contractual maturities of 10 and 7 years, respectively. The weighted average interest rate on outstanding advances at December 31, 2019 was 1.60%. During the year ended December 31, 2020, the Company repaid all the advances and incurred $6,838 in early termination costs. The Company maintained a line with the Federal Reserve Bank through the Borrower-in-Custody program in 2020 and 2019. As of December 31, 2020 and 2019, $2,463,281 and $1,407,662 of qualifying loans and $0 and $4,963 of investment securities were pledged to the Federal Reserve Bank through the Borrower-in-Custody program securing a line of credit of $1,695,639 and $1,013,239, respectively. Subordinated Debt In 2003, two separate trusts formed by the Company issued $9,000 of floating rate trust preferred securities (“Trust I”) and $21,000 of floating rate trust preferred securities (“Trust II”), respectively, as part of a pooled offering of such securities. The Company issued junior subordinated debentures of $9,280, which included proceeds of common securities purchased by the Company of $280, and junior subordinated debentures of $21,650, which included proceeds of common securities of $650. Both issuances were to the trusts in exchange for the proceeds of the securities offerings, which represent the sole asset of the trusts. Trust I pays interest quarterly based upon the 3-month LIBOR plus 3.25%. Trust II pays interest quarterly based upon the 3-month LIBOR plus 3.15%. Rates for the two issues at December 31, 2020, were 3.50% and 3.40%, respectively. Rates for the two issues at December 31, 2019, were 5.19% and 5.10%, respectively. The Company may redeem the first junior subordinated debenture listed, in whole or in part, on any distribution payment date within 120 days of the occurrence of a special event, at the redemption price. The Company may redeem the second junior subordinated debentures listed, in whole or in part, any time after June 26, 2008, on any distribution payment date, at the redemption price. The junior subordinated debentures must be redeemed no later than 2033. The Company has classified $30,000 of subordinated debt as Tier 1 capital at both December 31, 2020 and 2019. Additionally, during the year ended December 31, 2020, the Company placed $100,000 of ten year fixed-to-floating rate subordinated notes, maturing September 1, 2030. This subordinated note instrument pays interest semi-annually in arrears based on a 4.5% fixed annual interest rate for the first five years of the notes. For years six ten The Company also assumed two issues of subordinated debt, totaling $60,000, as part of the Franklin merger. The notes, issued in 2016, feature $40,000 of 6.875% fixed-to-floating rate subordinated notes due March 30, 2026 ("March 2026 Subordinated Notes"), and $20,000 of 7% fixed-to-floating rate subordinated notes due July 1, 2026 ("July 2026 Subordinated Notes"). Both note issuances currently pay interest semi-annually, and will begin resetting interest rates on a quarterly basis after March 30, 2021 and July 1, 2021. For years six ten Other borrowings During the year ended December 31, 2020, the Company initiated a credit line in the amount of $20.0 million (1.75% + 1 month LIBOR in effect 2 business days prior to reprice date) and borrowed $15.0 million against the line to fund the cash consideration paid in connection with the Farmers National transaction. As of December 31, 2020, an additional $5.0 million was available for the Company to draw. This line of credit had a term of one year and matured on February 21, 2021.

Income taxes

Income taxes	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income taxes	Income taxes: An allocation of federal and state income taxes between current and deferred portions is presented below: For the Year Ended December 31, 2020 2019 2,018 Current $ 44,362 $ 27,641 $ 19,259 Deferred (25,530) (1,916) 6,359 Total $ 18,832 $ 25,725 $ 25,618 The following table presents a reconciliation of federal income taxes at the statutory federal rate of 21% to the Company's effective tax rates for the year ended December 31, 2020, 2019, and 2018: For the Year Ended December 31, 2020 2019 2018 Federal taxes calculated at statutory rate $ 17,317 21.0 % $ 23,003 21.0 % $ 22,230 21.0 % Increase (decrease) resulting from: State taxes, net of federal benefit 3,197 3.9 % 4,792 4.4 % 4,666 4.4 % Expense (benefit) from equity based compensation 153 0.2 % (1,353) (1.2) % (870) (0.8) % Municipal interest income, net of interest disallowance (1,507) (1.8) % (908) (0.8) % (837) (0.8) % Bank owned life insurance (327) (0.4) % (51) (0.1) % (51) — % Merger costs 289 0.4 % 66 0.1 % 141 0.1 % Other (290) (0.4) % 176 0.1 % 339 0.3 % Income tax expense, as reported $ 18,832 22.9 % $ 25,725 23.5 % $ 25,618 24.2 % As of December 31, 2020, the Company acquired $8,346 of net operating losses from Franklin. The net operating loss carryforwards can be used to offset taxable income in future periods and reduce income tax liabilities in those future periods. While net operating losses are subject to certain annual utilization limits under IRC Section 382, the Company believes the net operating losses carryforward will be realized based on the projected annual limitation and the length of the net operating loss carryover period. The Company's determination of the realization of the net deferred tax asset is based on its assessment of all available positive and negative evidence. The net operating loss carryforward is set to expire as of December 31, 2030. The Company is no longer subject to examination by taxing authorities for tax years before 2017 for federal taxes and before 2016 for various state jurisdictions. The components of the net deferred tax assets (liabilities) at December 31, 2020 and December 31, 2019, are as follows: December 31, December 31 2020 2019 Deferred tax assets: Allowance for credit losses $ 48,409 $ 8,113 Operating lease liabilities 14,496 9,373 Federal net operating loss 1,753 — Amortization of core deposit intangibles — 1,386 Deferred compensation 8,872 5,231 Unrealized loss on debt securities — 54 Unrealized loss on equity securities — 60 Unrealized loss on cash flow hedges 499 — Other 19,101 2,388 Subtotal 93,130 26,605 Deferred tax liabilities: FHLB stock dividends $ (561) $ (550) Operating leases - right of use assets (13,197) (8,641) Depreciation (7,491) (5,078) Amortization of core deposit intangibles (684) — Unrealized gain on equity securities (17) — Unrealized gain on cash flow hedges — (203) Unrealized gain on debt securities (13,027) (3,051) Mortgage servicing rights (20,803) (19,678) Goodwill (11,301) (8,859) Other (9,653) (1,035) Subtotal (76,734) (47,095) Net deferred tax assets (liabilities) $ 16,396 $ (20,490)

Dividend restrictions

Dividend restrictions	12 Months Ended
	Dec. 31, 2020
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Dividend restrictions	Dividend restrictions: Due to regulations of the Tennessee Department of Financial Institutions (“TDFI”), the Bank may not declare dividends in any calendar year that exceeds the total of its net income of that year combined with its retained net income of the preceding two years without the prior approval of the TDFI Commissioner. Based upon this regulation, $185,703 and $223,730 was available for payment of dividends without such prior approval at December 31, 2020 and 2019, respectively. In addition, dividends paid by the Bank to the Company would be prohibited if the effect thereof would cause the Bank’s capital to be reduced below applicable minimum capital requirements. During the year ended December 31, 2020, there were $48,750 in cash dividends and $956 in security dividends declared from the Bank to the Company. No cash dividends were declared from the Bank to the Company during the years ended December 31, 2019 or 2018.

Commitments and contingencies

Commitments and contingencies	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	Commitments and contingencies: Some financial instruments, such as loan commitments, credit lines, letters of credit, and overdraft protection, are issued to meet customer financing needs. These are agreements to provide credit or to support the credit of others, as long as conditions established in the contract are met, and usually have expiration dates. Commitments may expire without being used. Off-balance sheet risk of credit loss exists up to the face amount of these instruments, although material losses are not anticipated. The same credit policies are used to make such commitments as are used for loans, including obtaining collateral at exercise of the commitment. December 31, 2020 2019 Commitments to extend credit, excluding interest rate lock commitments $ 2,719,996 $ 1,086,173 Letters of credit 67,598 19,569 Balance at end of period $ 2,787,594 $ 1,105,742 As of December 31, 2020, approximately $1.07 billion of loan commitments had fixed rates and $1.65 billion had floating rates. In connection with the adoption of CECL on January 1, 2020, the Company estimates expected credit losses on off-balance sheet loan commitments that are not accounted for as derivatives. When applying the CECL methodology to estimate expected credit loss, the Company considers the likelihood that funding will occur, the contractual period of exposure to credit loss, the risk of loss, historical loss experience, and current conditions along with expectations of future economic conditions. As such, upon adoption the Company recorded an initial allowance for credit losses on unfunded commitments in other liabilities amounting to $2,947. The impact net of taxes was recorded as part of the cumulative adjustment to retained earnings of $25,018 on January 1, 2020. The table below presents activity within the allowance for credit losses on unfunded commitments: For the Year Ended December 31, 2020 Balance at beginning of period $ — Impact of CECL adoption on provision for credit losses on unfunded commitments 2,947 Increase in provision for credit losses from unfunded commitments acquired in business combination 10,499 Provision for credit losses on unfunded commitments 2,932 Balance at end of period $ 16,378 In connection with the sale of mortgage loans to third party investors, the Bank makes usual and customary representations and warranties as to the propriety of its origination activities. Occasionally, the investors require the Bank to repurchase loans sold to them under the terms of the warranties. When this happens, the loans are recorded at fair value with a corresponding charge to a valuation reserve. The total principal amount of loans repurchased (or indemnified for) was $9,171, $6,475, and $6,646 for the years ended December 31, 2020, 2019, and 2018, respectively. The Company has established a reserve associated with loan repurchases. This reserve is recorded in accrued expenses and other liabilities on the consolidated balance sheets. The following table summarizes the activity in the repurchase reserve: For the Year Ended December 31, 2020 2019 2018 Balance at beginning of period $ 3,529 $ 3,273 $ 3,386 Provision for loan repurchases or indemnifications 2,607 362 174 Recoveries on previous losses (208) (106) 3 Losses on loans repurchased or indemnified — — (290) Balance at end of period $ 5,928 $ 3,529 $ 3,273

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives: The Company utilizes derivative financial instruments as part of its ongoing efforts to manage its interest rate risk exposure as well as the exposure for its customers. Derivative financial instruments are included in the consolidated balance sheets line item “Other assets” or “Other liabilities” at fair value in accordance with ASC 815, “Derivatives and Hedging.” The Company enters into commitments to originate loans whereby the interest rate on the loan is determined prior to funding (rate-lock commitments). Under such commitments, interest rates for mortgage loans are typically locked in for between 45 to 90 days with the customer. These interest rate lock commitments are recorded at fair value in the Company’s consolidated balance sheets. The Company also enters into best effort or mandatory delivery forward commitments to sell residential mortgage loans to secondary market investors. Gains and losses arising from changes in the valuation of the rate-lock commitments and forward commitments are recognized currently in earnings and are reflected under the line item “Mortgage banking income” on the consolidated statements of income. The Company enters into forward commitments, futures and options contracts that are not designated as hedging instruments as economic hedges to offset the changes in fair value of MSRs. Gains and losses associated with these instruments are included in earnings and are reflected under the line item “Mortgage banking income” on the consolidated statements of income. Additionally, the Company enters into derivative instruments that are not designated as hedging instruments to help its commercial customers manage their exposure to interest rate fluctuations. To mitigate the interest rate risk associated with customer contracts, the Company enters into an offsetting derivative contract. The Company manages its credit risk, or potential risk of default by its commercial customers through credit limit approval and monitoring procedures. The Company also maintains two interest rate swap agreements with notional amounts totaling $30,000 used to hedge interest rate exposure on outstanding subordinated debentures included in long-term debt totaling $30,930. Under these agreements, the Company receives a variable rate of interest equal to 3-month LIBOR and pays a weighted average fixed rate of interest of 2.08%. The interest rate swap contracts, which mature in June of 2024, are designated as cash flow hedges with the objective of reducing the variability in cash flows resulting from changes in interest rates. As of December 31, 2020 and December 31, 2019, the fair value of these contracts resulted in liability balances of $1,909 and $515, respectively. In July 2017, the Company entered into three interest rate swap contracts on floating rate liabilities at the Bank level with notional amounts of $30,000, $35,000 and $35,000 for a period of three four three four The following tables provide details on the Company’s derivative financial instruments as of the dates presented: December 31, 2020 Notional Amount Asset Liability Not designated as hedging: Interest rate contracts $ 606,878 $ 34,547 $ 34,317 Forward commitments 1,358,328 — 11,633 Interest rate-lock commitments 1,191,621 34,391 — Futures contracts 375,400 — 383 Total $ 3,532,227 $ 68,938 $ 46,333 December 31, 2019 Notional Amount Asset Liability Not designated as hedging: Interest rate contracts $ 440,556 $ 14,929 $ 14,929 Forward commitments 684,437 — 866 Interest rate-lock commitments 453,198 7,052 — Futures contracts 389,000 — 1,623 Total $ 1,967,191 $ 21,981 $ 17,418 December 31, 2020 Notional Amount Asset Liability Designated as hedging: Interest rate swaps $ 30,000 $ — $ 1,909 December 31, 2019 Notional Amount Asset Liability Designated as hedging: Interest rate swaps $ 30,000 $ — $ 515 Gains (losses) included in the consolidated statements of income related to the Company’s derivative financial instruments were as follows: Year Ended December 31, 2020 2019 2018 Not designated as hedging instruments (included in mortgage banking income): Interest rate lock commitments $ 27,339 $ (2,112) $ (527) Forward commitments (73,033) 12,170 3,864 Futures contracts 8,151 (6,723) (2,981) Option contracts — (47) (58) Total $ (37,543) $ 3,288 $ 298 Year Ended December 31, 2020 2019 2018 Designated as hedging: Amount of gain reclassified from other comprehensive income and recognized in interest expense on borrowings, net of taxes of $337, $170, and $45 $ 955 $ 481 $ 128 (Loss) gain included in interest expense on borrowings (353) 115 32 Total $ 602 $ 596 $ 160 The following discloses the amount included in other comprehensive income, net of tax, for derivative instruments designated as cash flow hedges for the periods presented: Year Ended December 31, 2020 2019 2018 Designated as hedging: Amount of (loss) gain recognized in other comprehensive income, net of tax $363, $322, and $366 $ (1,031) $ (914) $ 1,039 Certain financial instruments, including derivatives, may be eligible for offset in the consolidated balance sheets when the “right of offset” exists or when the instruments are subject to an enforceable master netting agreement, which includes the right of the non-defaulting party or non-affected party to offset recognized amounts, including collateral posted with the counterparty, to determine a net receivable or net payable upon early termination of the agreement. Certain of the Company’s derivative instruments are subject to master netting agreements, however the Company has not elected to offset such financial instruments in the consolidated balance sheets. The following table presents the Company's gross derivative positions as recognized in the consolidated balance sheets as well as the net derivative positions, including collateral pledged to the extent the application of such collateral did not reduce the net derivative liability position below zero, had the Company elected to offset those instruments subject to an enforceable master netting agreement: Offsetting Derivative Assets Offsetting Derivative Liabilities December 31, 2020 December 31, 2019 December 31, 2020 December 31, 2019 Gross amounts recognized $ 3,863 $ 331 $ 34,051 $ 14,682 Gross amounts offset in the consolidated balance sheets — — — — Net amounts presented in the consolidated balance sheets 3,863 331 34,051 14,682 Gross amounts not offset in the consolidated balance sheets Less: financial instruments 857 139 857 139 Less: financial collateral pledged — — 33,194 14,543 Net amounts $ 3,006 $ 192 $ — $ — Most derivative contracts with clients are secured by collateral. Additionally, in accordance with the interest rate agreements with derivatives dealers, the Company may be required to post margin to these counterparties. At December 31, 2020 and December 31, 2019, the Company had minimum collateral posting thresholds with certain derivative counterparties and had collateral posted of $57,985 and $33,616, respectively, against its obligations under these agreements. Cash collateral related to derivative contracts is recorded in other assets in the consolidated balance sheets.

Fair value of financial instrum

Fair value of financial instruments	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair value of financial instruments	Fair value of financial instruments:FASB ASC 820-10 defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. ASC 820-10 also establishes a framework for measuring the fair value of assets and liabilities according to a hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets and liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The hierarchy maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that are derived from assumptions based on management’s estimate of assumptions that market participants would use in pricing the asset or liability based on the best information available under the circumstances. The hierarchy is broken down into the following three levels, based on the reliability of inputs: Level 1: Unadjusted quoted prices in active markets for identical assets or liabilities that are accessible at the measurement date. Level 2: Significant other observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs for assets or liabilities that are derived from assumptions based on management’s estimate of assumptions that market participants would use in pricing the assets or liabilities. The Company records the fair values of financial assets and liabilities on a recurring and non-recurring basis using the following methods and assumptions: Investment securities-Investment securities are recorded at fair value on a recurring basis. Fair values for securities are based on quoted market prices, where available. If quoted prices are not available, fair values are based on quoted market prices of similar instruments or are determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the pricing relationship or correlation among other benchmark quoted securities. Investment securities valued using quoted market prices of similar instruments or that are valued using matrix pricing are classified as Level 2. When significant inputs to the valuation are unobservable, the available-for-sale securities are classified within Level 3 of the fair value hierarchy. Where no active market exists for a security or other benchmark securities, fair value is estimated by the Company with reference to discount margins for other high-risk securities. Loans held for sale-Loans held for sale are carried at fair value. Fair value is determined using current secondary market prices for loans with similar characteristics, that is, using Level 2 inputs. Derivatives-The fair value of the interest rate swaps are based upon fair values provided from entities that engage in interest rate swap activity and is based upon projected future cash flows and interest rates. Fair value of commitments is based on fees currently charged to enter into similar agreements, and for fixed-rate commitments, the difference between current levels of interest rates and the committed rates is also considered. These financial instruments are classified as Level 2. Other real estate owned (“OREO”)-OREO is comprised of commercial and residential real estate obtained in partial or total satisfaction of loan obligations and excess land and facilities held for sale. OREO acquired in settlement of indebtedness is recorded at the lower of the carrying amount of the loan or the fair value of the real estate less costs to sell. Fair value is determined on a nonrecurring basis based on appraisals by qualified licensed appraisers and is adjusted for management’s estimates of costs to sell and holding period discounts. The valuations are classified as Level 3. Mortgage servicing rights ("MSRs")-MSRs are carried at fair value. Fair value is determined using an income approach with various assumptions including expected cash flows, market discount rates, prepayment speeds, servicing costs, and other factors. As such, mortgage servicing rights are considered Level 3. Collateral dependent loans (Impaired loans prior to the adoption of ASC 326)-loans for which, based on current information and events, the Company has determined foreclosure of the collateral is probable, or where the borrower is experiencing financial difficulty and the Company expects repayment of the loan to be provided substantially through the operation or sale of the collateral and it is probable that the creditor will be unable to collect all amounts due according to the contractual terms of the loan agreement. Collateral dependent loans are classified as Level 3. The following table contains the estimated fair values and the related carrying values of the Company's financial instruments. Items which are not financial instruments are not included. Fair Value December 31, 2020 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 1,317,898 $ 1,317,898 $ — $ — $ 1,317,898 Investment securities 1,176,991 — 1,176,991 — 1,176,991 Loans, net 6,912,570 — — 7,058,693 7,058,693 Loans held for sale 899,173 — 683,770 215,403 899,173 Interest receivable 43,603 33 5,254 38,316 43,603 Mortgage servicing rights 79,997 — — 79,997 79,997 Derivatives 68,938 — 68,938 — 68,938 Financial liabilities: Deposits: Without stated maturities $ 8,020,783 $ 8,020,783 $ — $ — $ 8,020,783 With stated maturities 1,437,254 — 1,446,605 — 1,446,605 Securities sold under agreement to repurchase and federal funds sold 32,199 32,199 — — 32,199 Subordinated debt 189,527 — — 192,149 192,149 Other borrowings 16,598 — 16,598 — 16,598 Interest payable 6,772 327 4,210 2,235 6,772 Derivatives 48,242 — 48,242 — 48,242 Fair Value December 31, 2019 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 232,681 $ 232,681 $ — $ — $ 232,681 Investment securities 691,676 — 691,676 — 691,676 Loans, net 4,378,503 — — 4,363,903 4,363,903 Loans held for sale 262,518 — 262,518 — 262,518 Interest receivable 17,083 — 3,282 13,801 17,083 Mortgage servicing rights 75,521 — — 75,521 75,521 Derivatives 21,981 — 21,981 — 21,981 Financial liabilities: Deposits: Without stated maturities $ 3,743,085 $ 3,743,085 $ — $ — $ 3,743,085 With stated maturities 1,191,853 — 1,200,145 — 1,200,145 Securities sold under agreement to repurchase and federal funds sold 23,745 23,745 — — 23,745 Federal Home Loan Bank advances 250,000 — 250,213 — 250,213 Subordinated debt 30,930 — 29,706 — 29,706 Interest payable 6,465 376 6,089 — 6,465 Derivatives 17,933 — 17,933 — 17,933 The balances and levels of the assets measured at fair value on a recurring basis at December 31, 2020 are presented in the following table: December 31, 2020 Quoted prices Significant Significant unobservable Total Recurring valuations: Financial assets: Available-for-sale securities: U.S. government agency securities $ — $ 2,003 $ — $ 2,003 Mortgage-backed securities - residential — 773,336 — 773,336 Mortgage-backed securities - commercial — 21,588 — 21,588 Municipals, tax-exempt — 356,329 — 356,329 Treasury securities — 16,628 — 16,628 Corporate securities — 2,516 — 2,516 Equity securities — 4,591 — 4,591 Total $ — $ 1,176,991 $ — $ 1,176,991 Loans held for sale $ — $ 683,770 $ 215,403 $ 899,173 Mortgage servicing rights — — 79,997 79,997 Derivatives — 68,938 — 68,938 Financial Liabilities: Derivatives — 48,242 — 48,242 The balances and levels of the assets measured at fair value on a non-recurring basis at December 31, 2020 are presented in the following table: At December 31, 2020 Quoted prices Significant Significant unobservable Total Non-recurring valuations: Financial assets: Other real estate owned $ — $ — $ 6,662 $ 6,662 Collateral dependent loans: Commercial and industrial $ — $ — $ 1,728 $ 1,728 Construction — — 3,877 3,877 Residential real estate: 1-4 family mortgage — — 226 226 Residential line of credit — — 1,174 1,174 Commercial real estate: Non-owner occupied — — 3,391 3,391 Consumer and other — — 8,164 8,164 Total collateral dependent loans $ — $ — $ 18,560 $ 18,560 The balances and levels of the assets measured at fair value on a recurring basis at December 31, 2019 are presented in the following table: At December 31, 2019 Quoted prices Significant Significant unobservable Total Recurring valuations: Financial assets: Available-for-sale securities: Mortgage-backed securities - residential $ — $ 477,312 $ — $ 477,312 Mortgage-backed securities - commercial — 13,364 — 13,364 Municipals, tax-exempt — 189,235 — 189,235 Treasury securities — 7,448 — 7,448 Corporate securities — 1,022 — 1,022 Equity securities — 3,295 — 3,295 Total $ — $ 691,676 $ — $ 691,676 Loans held for sale $ — $ 262,518 $ — $ 262,518 Mortgage servicing rights — — 75,521 75,521 Derivatives — 21,981 — 21,981 Financial Liabilities: Derivatives — 17,933 — 17,933 The balances and levels of the assets measured at fair value on a non-recurring basis at December 31, 2019 are presented in the following table: At December 31, 2019 Quoted prices Significant Significant unobservable Total Non-recurring valuations: Financial assets: Other real estate owned $ — $ — $ 9,774 $ 9,774 Impaired Loans (1) : Commercial and industrial $ — $ — $ 6,481 $ 6,481 Residential real estate: 1-4 family mortgage — — 378 378 Residential line of credit — — 321 321 Commercial real estate: Owner occupied — — 951 951 Non-owner occupied — — 2,560 2,560 Total $ — $ — $ 10,691 $ 10,691 (1) Includes both impaired non-purchased loans and collateral-dependent PCI loans. The following table presents information as of December 31, 2020 about significant unobservable inputs (Level 3) used in the valuation of assets measured at fair value on a nonrecurring basis: Financial instrument Fair Value Valuation technique Significant Range of Collateral dependent loans $ 18,560 Valuation of collateral Discount for comparable sales 0%-30% Other real estate owned $ 6,662 Appraised value of property less costs to sell Discount for costs to sell 0%-15% The following table presents information as of December 31, 2019 about significant unobservable inputs (Level 3) used in the valuation of assets measured at fair value on a nonrecurring basis: Financial instrument Fair Value Valuation technique Significant Range of Impaired loans (1) $ 10,691 Valuation of collateral Discount for comparable sales 0%-30% Other real estate owned $ 9,774 Appraised value of property less costs to sell Discount for costs to sell 0%-15% (1) Includes both impaired non-purchased loans and collateral-dependent PCI loans. For collateral dependent loans, the ACL is measured based on the difference between the fair value of the collateral and the amortized cost basis of the loan as of the measurement date. Fair value of the loan's collateral is determined by third-party appraisals, which are then adjusted for the estimated selling and closing costs related to liquidation of of the collateral. Collateral dependent loans are reviewed and evaluated on at least a quarterly basis for additional impairment and adjusted accordingly, based on changes in market conditions from the time of valuation and management's knowledge of the client and client's business. Other real estate owned acquired in settlement of indebtedness is recorded at fair value of the real estate less estimated costs to sell. Subsequently, it may be necessary to record nonrecurring fair value adjustments for declines in fair value. Any write-downs based on the asset's fair value at the date of foreclosure are charged to the allowance for credit losses. Appraisals for both collateral dependent loans and other real estate owned are performed by certified general appraisers (for commercial properties) or certified residential appraisers (for residential properties) whose qualifications and licenses have been reviewed and verified by the Company. Once received, a member of the lending administrative department reviews the assumptions and approaches utilized in the appraisal as well as the overall resulting fair value in comparison with independent data sources such as recent market data or industry wide statistics. Fair value option The Company measures mortgage loans originated for sale at fair value under the fair value option as permitted under ASC 825. Electing to measure these assets at fair value reduces certain timing differences and more accurately matches the changes in fair value of the loans with changes in the fair value of derivative instruments used to economically hedge them. Net gains of $24,233 resulting from fair value changes of mortgage loans were recorded in income during the year ended December 31, 2020, compared to net losses of $2,861 during the year ended December 31, 2019, respectively. The amount does not reflect changes in fair values of related derivative instruments used to hedge exposure to market-related risks associated with these mortgage loans. The change in fair value of both loans held for sale and the related derivative instruments are recorded in Mortgage Banking Income in the consolidated statements of income. Election of the fair value option allows the Company to reduce the accounting volatility that would otherwise result from the asymmetry created by accounting for the financial instruments at the lower of cost or fair value and the derivatives at fair value. As of December 31, 2020, and 2019, there were $151,184 and $51,705, respectively, of GNMA loans previously sold that the Company did not record on its consolidated balance sheets as the Company determined there not to be a more-than-trivial benefit based on an analysis of interest rates and an assessment of potential reputational risk associated with these loans. The Company’s valuation of loans held for sale incorporates an assumption for credit risk; however, given the short-term period that the Company holds these loans, valuation adjustments attributable to instrument-specific credit risk is nominal. Interest income on loans held for sale measured at fair value is accrued as it is earned based on contractual rates and is reflected in loan interest income in the consolidated statements of income. The following table summarizes the differences between the fair value and the principal balance for loans held for sale and nonaccrual loans measured at fair value as of December 31, 2020 and 2019: December 31, 2020 Aggregate Aggregate Difference Mortgage loans held for sale measured at fair value $ 683,770 $ 651,887 $ 31,883 Commercial loans held for sale measured at fair value 208,914 226,867 (17,953) Past due loans of 90 days or more 83 163 (80) Nonaccrual loans 6,406 12,033 (5,627) December 31, 2019 Mortgage loans held for sale measured at fair value $ 262,518 $ 254,868 $ 7,650 Past due loans of 90 days or more — — — Nonaccrual loans — — —

Parent company financial statem

Parent company financial statements	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Parent company financial statements	Parent company financial statements: As of December 31, Balance sheet 2020 2019 Assets Cash and cash equivalents (1) $ 5,310 $ 4,673 Investments: Equity securities, at fair value 1,173 — Investment in subsidiaries (1) 1,378,347 782,565 Other assets 12,240 6,292 Goodwill 29 29 Total assets $ 1,397,099 $ 793,559 Liabilities and shareholders' equity Liabilities Borrowings $ 106,299 $ 30,930 Accrued expenses and other liabilities (489) 300 Total liabilities 105,810 31,230 Shareholders' equity Common stock 47,222 31,034 Additional paid-in capital 898,847 425,633 Retained earnings 317,625 293,524 Accumulated other comprehensive income 27,595 12,138 Total shareholders' equity 1,291,289 762,329 Total liabilities and shareholders' equity $ 1,397,099 $ 793,559 (1) Eliminates in Consolidation For the years ended December 31, Income Statements 2020 2019 2018 Income Dividend income from subsidiaries (1) $ 49,706 $ — $ — Gain on investments 217 — — (Loss) gain on other assets — (16) 297 Other income 1,732 211 — Total income 51,655 195 297 Expenses Interest expense 3,122 1,638 1,651 Salaries, legal and professional fees 1,458 1,056 1,481 Other noninterest expense 283 120 960 Total expenses 4,863 2,814 4,092 Income (loss) before income tax benefit and equity in undistributed 46,792 (2,619) (3,795) Federal and state income tax benefit (1,155) (683) (746) Income (loss) before equity in undistributed earnings of subsidiaries 47,947 (1,936) (3,049) Equity in undistributed earnings from subsidiaries (1) 15,674 85,750 83,285 Net income $ 63,621 $ 83,814 $ 80,236 (1) Eliminates in Consolidation For the years ended December 31, Statement of Cash Flows 2020 2019 2018 Operating Activities Net income $ 63,621 $ 83,814 $ 80,236 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed income of subsidiaries (15,674) (85,750) (83,285) Gain on investments (217) — — Loss (gain) on other assets — 16 (297) Stock-based compensation expense 10,214 7,089 7,207 (Increase) decrease in other assets (9,717) 1,056 (441) Decrease in other liabilities (13,363) (9,711) (7,737) Net provided by (used in) operating activities 34,864 (3,486) (4,317) Investing Activities Proceeds from sale of other assets — — 869 Net cash paid in business combinations (See Note 2) (35,505) — — Net cash (used in) provided by investing activities (35,505) — 869 Financing Activities Accretion of interest rate premium on subordinated debt (436) — — Payment of dividends (14,264) (10,045) (6,137) Proceeds of other borrowings 15,000 — — Net proceeds from sale of common stock 978 804 1,196 Net cash used in financing activities 1,278 (9,241) (4,941) Net decrease in cash and cash equivalents 637 (12,727) (8,389) Cash and cash equivalents at beginning of year 4,673 17,400 25,789 Cash and cash equivalents at end of year $ 5,310 $ 4,673 $ 17,400 Supplemental noncash disclosures: Dividends declared not paid on restricted stock units $ 238 $ 149 $ 226 Noncash dividend from Bank 956 — 572

Segment reporting

Segment reporting	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Segment reporting	Segment reporting: The Company and the Bank are engaged in the business of banking and provide a full range of financial services. The Company determines reportable segments based on the significance of the segment’s operating results to the overall Company, the products and services offered, customer characteristics, processes and service delivery of the segments and the regular financial performance review and allocation of resources by the Chief Executive Officer (“CEO”), the Company’s chief operating decision maker. The Company has identified two distinct reportable segments—Banking and Mortgage. The Company’s primary segment is Banking, which provides a full range of deposit and lending products and services to corporate, commercial and consumer customers. The Company offers full-service conforming residential mortgage products, including conforming residential loans and services through the Mortgage segment utilizing mortgage offices outside of the geographic footprint of the Banking operations. Additionally, the Mortgage segment includes the servicing of residential mortgage loans and the packaging and securitization of loans to governmental agencies. The residential mortgage products and services originated in our Banking footprint and related revenues and expenses are included in our Banking segment. The Company’s mortgage division represents a distinct reportable segment which differs from the Company’s primary business of commercial and retail banking. The financial performance of the Mortgage segment is assessed based on results of operations reflecting direct revenues and expenses and allocated expenses. This approach gives management a better indication of the operating performance of the segment. When assessing the Banking segment’s financial performance, the CEO utilizes reports with indirect revenues and expenses including but not limited to the investment portfolio, electronic delivery channels and areas that primarily support the banking segment operations. Therefore these are included in the results of the Banking segment. Other indirect revenue and expenses related to general administrative areas are also included in the internal financial results reports of the Banking segment utilized by the CEO for analysis and are thus included for Banking segment reporting. The Mortgage segment utilizes funding sources from the Banking segment in order to fund mortgage loans that are ultimately sold on the secondary market. The Mortgage segment uses the proceeds from loan sales to repay obligations due to the Banking segment. During the first quarter of 2019, the Company's Board of Directors approved management's strategic plan to exit its wholesale mortgage delivery channels. On June 7, 2019, the Company completed the sale of its third party origination ("TPO") channel and on August 1, 2019, the Company completed the sale of its correspondent channel. The Mortgage segment incurred $1,995 in restructuring and miscellaneous charges, during the year ended December 31, 2019, related to these sales. The restructuring charges include a one time charge of $100 in relief of goodwill associated with the TPO channel. The following tables provide segment financial information for the years ended December 31, 2020, 2019, and 2018 as follows: Year Ended December 31, 2020 Banking (4) Mortgage Consolidated Net interest income $ 265,581 $ 77 $ 265,658 Provisions for credit losses (1) 107,967 — 107,967 Mortgage banking income 75,426 214,276 289,702 Change in fair value of mortgage servicing rights, net of hedging (2) — (34,374) (34,374) Other noninterest income 46,527 — 46,527 Depreciation and amortization 6,425 584 7,009 Amortization of intangibles 5,323 — 5,323 Other noninterest mortgage banking expense 49,010 101,798 150,808 Other noninterest expense (3) 212,890 1,055 213,945 Income before income taxes $ 5,919 $ 76,542 $ 82,461 Income tax expense 18,832 Net income applicable to FB Financial Corporation and noncontrolling interest $ 63,629 Net income applicable to noncontrolling interest 8 Net income applicable to FB Financial Corporation $ 63,621 Total assets $ 10,529,812 $ 677,518 $ 11,207,330 Goodwill 242,561 — 242,561 (1) Included $13,361 in provision for credit losses on unfunded commitments. (2) Included in mortgage banking income in the Company's consolidated statements of income. (3) Included $33,824 of merger costs in the Banking segment related to the acquisition and integration of Farmers National and Franklin, and $1,055 of merger costs in the Mortgage segment related to the Franklin merger. (4) Banking segment includes noncontrolling interest. Year Ended December 31, 2019 Mortgage Consolidated Net interest income $ 226,098 $ (62) $ 226,036 Provision for credit losses 7,053 — 7,053 Mortgage banking income 30,429 87,476 117,905 Change in fair value of mortgage servicing rights, net of hedging (1) — (16,989) (16,989) Other noninterest income 34,481 — 34,481 Depreciation and amortization 4,670 506 5,176 Amortization of intangibles 4,339 — 4,339 Other noninterest mortgage banking expense 23,216 65,457 88,673 Other noninterest expense (2) 144,658 1,995 146,653 Income before income taxes $ 107,072 $ 2,467 $ 109,539 Income tax expense 25,725 Net income $ 83,814 Total assets $ 5,795,888 $ 329,033 $ 6,124,921 Goodwill 169,051 — 169,051 (1) Included in mortgage banking income in the Company's consolidated statements of income. (2) Includes $5,385 in merger costs in the Banking segment related to the Atlantic Capital branch acquisition and $1,995 in mortgage restructuring charges in the Mortgage segment. Year Ended December 31, 2018 Banking Mortgage Consolidated Net interest income $ 204,517 $ (449) $ 204,068 Provision for loan loss 5,398 — 5,398 Mortgage banking income 25,460 83,874 109,334 Change in fair value of mortgage servicing rights, net of hedging (1) — (8,673) (8,673) Other noninterest income 29,981 — 29,981 Depreciation and amortization 3,827 507 4,334 Amortization of intangibles 3,185 — 3,185 Other noninterest mortgage banking expense 21,671 73,068 94,739 Other noninterest expense (2) 121,200 — 121,200 Income before income taxes $ 104,677 $ 1,177 $ 105,854 Income tax expense 25,618 Net income $ 80,236 Total assets $ 4,752,111 $ 384,653 $ 5,136,764 Goodwill 137,090 100 137,190 (1) Included in mortgage banking income in the Company's consolidated statements of income. (2) Included $1,594 in merger costs and $671 in costs related to follow-on secondary offering in the Banking segment. Our Banking segment provides our Mortgage segment with a warehouse line of credit that is used to fund mortgage loans held for sale. The warehouse line of credit, which is eliminated in consolidation, had a prime interest rate of 3.25% and 4.75% as of December 31, 2020 and 2019, respectively, and is limited based on interest income earned by the Mortgage segment. The amount of interest paid by our Mortgage segment to our Banking segment under this warehouse line of credit is recorded as interest income to our Banking segment and as interest expense to our Mortgage segment, both of which are included in the calculation of net interest income for each segment. The amount of interest paid by our Mortgage segment to our Banking segment under this warehouse line of credit was $14,810, $11,183 and $16,057 for the years ended December 31, 2020, 2019 and 2018, respectively.

Minimum capital requirements

Minimum capital requirements	12 Months Ended
	Dec. 31, 2020
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Minimum capital requirements	Minimum capital requirements: Banks and bank holding companies are subject to regulatory capital requirements administered by federal banking agencies. Capital adequacy guidelines and, additionally for banks, prompt corrective action regulations involve quantitative measures of assets, liabilities, and certain off-balance sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators. Failure to meet capital requirements can initiate regulatory action. Under regulatory guidance for non-advanced approaches institutions, the Bank and Company are required to maintain minimum capital ratios as outlined in the table below. Additionally, under U.S. Basel III Capital Rules, the decision was made to opt out of including accumulated other comprehensive income in regulatory capital. As of December 31, 2020 and 2019, the Bank and Company met all capital adequacy requirements to which they are subject. In December 2018, the OCC, the Board of Governors of the Federal Reserve System, and the FDIC approved a final rule to address changes to credit loss accounting under GAAP, including banking organizations’ implementation of CECL. The final rule provides banking organizations the option to phase in over a three-year period the day-one adverse effects on regulatory capital that may result from the adoption of the new accounting standard. In March 2020, the OCC, the Board of Governors of the Federal Reserve System, and the FDIC announced a final rule to delay the estimated impact on regulatory capital stemming from the implementation of CECL. The final rule maintains the three-year transition option in the previous rule and provides banks the option to delay for two years an estimate of CECL’s effect on regulatory capital, relative to the incurred loss methodology’s effect on regulatory capital, followed by a three-year transition period (five-year transition option). The Company adopted the capital transition relief over the permissible five-year period. Actual and required capital amounts and ratios are included below for the periods presented. Actual Minimum Capital To be well capitalized Amount Ratio Amount Ratio Amount Ratio December 31, 2020 Total Capital (to risk-weighted assets) FB Financial Corporation $ 1,358,897 15.0 % $ 952,736 10.5 % N/A N/A FirstBank 1,353,279 14.9 % 951,327 10.5 % $ 906,026 10.0 % Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 1,090,364 12.0 % $ 771,262 8.5 % N/A N/A FirstBank 1,142,548 12.6 % 770,122 8.5 % $ 724,820 8.0 % Tier 1 Capital (to average assets) FB Financial Corporation $ 1,090,364 10.0 % $ 435,064 4.0 % N/A N/A FirstBank 1,142,548 10.5 % 435,279 4.0 % $ 544,098 5.0 % Common Equity Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 1,060,364 11.7 % $ 635,157 7.0 % N/A N/A FirstBank 1,142,548 12.6 % 634,218 7.0 % $ 588,917 6.5 % Actual Minimum Capital To be well capitalized Amount Ratio Amount Ratio Amount Ratio December 31, 2019 Total Capital (to risk-weighted assets) FB Financial Corporation $ 633,549 12.2 % $ 545,268 10.5 % N/A N/A FirstBank 623,432 12.1 % 540,995 10.5 % $ 515,233 10.0 % Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 602,410 11.6 % $ 441,421 8.50 % N/A N/A FirstBank 592,293 11.5 % 437,782 8.50 % $ 412,030 8.0 % Tier 1 Capital (to average assets) FB Financial Corporation $ 602,410 10.1 % $ 238,578 4.00 % N/A N/A FirstBank 592,293 9.9 % 239,310 4.00 % $ 299,138 5.0 % Common Equity Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 572,410 11.1 % $ 360,979 7.0 % N/A N/A FirstBank 592,293 11.5 % 360,526 7.0 % $ 334,774 6.5 %

Employee benefit plans

Employee benefit plans	12 Months Ended
	Dec. 31, 2020
Retirement Benefits [Abstract]
Employee benefit plans	Employee benefit plans: (A)—401(k) plan: The Bank has a 401(k) Plan (the “Plan”) whereby substantially all employees participate in the Plan. Employees may contribute the maximum amount of their eligible compensation subject to certain limits based on the federal tax laws. During the year ended December 31, 2019, the Bank increased the employer match to 50% of participant contributions not to exceed 6% of an employee’s total compensation. Prior to 2019, the employer match was 25% of participant contributions not to exceed 6% of an employee's total compensation with an additional discretionary 25% match. Additionally, during 2019, the vesting term of profit sharing contributions was changed to a three-year ratable period from five years in 2018. For the years ended December 31, 2020, 2019 and 2018, the matching portions provided by the Bank to this Plan were $3,198 and $2,325 and $2,211 respectively, which includes an additional discretionary contribution of 25% match for 2018. (B)—Acquired supplemental retirement plans: In prior years, the Company assumed certain nonqualified supplemental retirement plans for certain former employees of acquired entities. At December 31, 2020 and 2019, other liabilities on the consolidated balance sheet included post-retirement benefits payable of $1,112 and $1,315, respectively, related to these plans. For the years ended December 31, 2020, 2019 and 2018, the Company recorded expense of $29, $1 and $4, respectively, related to these plans and payments to the participants were $131, $150 and $191 in 2020, 2019 and 2018, respectively. The Company also acquired single premium life insurance policies on these individuals. At December 31, 2020 and 2019, other assets on the consolidated balance sheet include cash surrender value of bank owned life insurance amounting to $71,977 and $11,357, respectively. Income related to these policies (net of related insurance premium expense) amounted to $1,556, $240 and $158 in 2020, 2019 and 2018, respectively. (C)—Deferred compensation plans and agreements: 2012 EBI Plan — The Bank granted awards (“EBI Units”) to certain employees pursuant to the the FirstBank 2012 Equity Based Incentive Plan (the “2012 EBI Plan”). Prior to the initial public offering, awards granted under the 2012 EBI Plan were settled in cash only. Following the initial public offering, participants in the EBI Plans were given the one-time option to elect, for each EBI Unit vested to such participant, either (i) an amount in cash or (ii) a number of shares of Company common stock determined pursuant to a conversion formula that took into account the effect of the initial public offering. Consistent with the terms of the EBI Plans and approved by the Board of Directors, outstanding EBI Units were adjusted to reflect the 100-for-one stock split that was effectuated prior to the IPO. EBI Units granted under the 2012 EBI Plan were fully vested and paid out during the year ended December 31, 2019. No further grants will be made under the 2012 EBI Plan. Deferred Compensation Agreement —Effective December 31, 2014, the Bank entered into an agreement with the Bank’s Chief Executive Officer to reward his prior service, pursuant to which he is entitled to receive a fixed lump sum cash payment equal to $3,000,000 on December 31, 2019 or the earlier occurrence of his separation of service or a change in control of the Company. On August 19, 2016, the Bank entered into an amendment to the deferred compensation agreement, pursuant to which the award was converted to 157,895 deferred stock units, determined by dividing $3,000,000 by $19.00 (the IPO price). On December 31, 2019, the deferred stock units were converted on a 1-for-1 basis into shares of Company common stock and distributed. No other awards have been made under this agreement. Summary —At December 31, 2019, the accompanying consolidated balance sheet included other liabilities for cash-settled awards under the EBI Plans amounting to $993 representing 29,172 units for those employees who elected cash settlement of EBI units. As of January 31, 2019, these cash-settled awards were fully distributed. For the years ended December 31 , 2019 and 2018, the Company incurred expenses related to these plans and agreements totaling $484 and $3,787, respectively, which is included in salaries, commissions and employee benefits in the accompanying statement of income. Additionally, payments under the plans totaled $1,191 and $1,818 for years ended December 31, 2019 and 2018, respectively.

Stock-based compensation

Stock-based compensation	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation Restricted Stock Units The Company grants restricted stock units under compensation arrangements for the benefit of employees, executive officers, and directors. Restricted stock unit grants are subject to time-based vesting. The total number of restricted stock units granted represents the maximum number of restricted stock units eligible to vest based upon the service conditions set forth in the grant agreements. The following table summarizes information about the changes in restricted stock units as of and for the year ended December 31, 2020: Restricted Stock Weighted Balance at beginning of period 826,263 $ 23.76 Granted (1) 420,521 31.35 Vested (177,581) 31.64 Forfeited (22,132) 33.20 Balance at end of period 1,047,071 $ 26.06 (1) Includes 118,776 restricted stock units issued in replacement of those initially granted by Franklin. See Note 2, "Mergers and acquisitions" for additional information. The total fair value of restricted stock units vested and released was $5,619, $9,923 and $4,562 for the years ended December 31, 2020, 2019, and 2018, respectively. The weighted average grant date fair value price was $31.35, $34.08 and $39.55 for the years ended December 31, 2020, 2019 and 2018, respectively. The compensation cost related to stock grants and vesting of restricted stock units was $9,213, $7,089, and $7,436 for the years ended December 31, 2020, 2019, and 2018, respectively. This included $898, $724, and $645 paid to Company independent directors during the years ended December 31, 2020, 2019, and 2018, respectively, related to independent director grants and compensation elected to be settled in stock. As of December 31, 2020, there was $13,436 of total unrecognized compensation cost related to unvested restricted stock units which is expected to be recognized over a weighted-average period of 2.5 years. As of December 31, 2020 and December 31, 2019, there were 2,240,434 and 2,377,574 shares available for issuance under the 2016-LTIP plan, respectively. At December 31, 2020 and December 31, 2019, there were $613 and $375, respectively, accrued in other liabilities related to dividends declared to be paid upon vesting and distribution of the underlying RSUs. Performance Based Restricted Stock Units During 2020, the Company began awarding performance-based restricted stock units ("PSUs") to executives and other officers and employees. Under the terms of the award, the number of units that will vest and convert to shares of common stock will be based on the extent to which the Company achieves specified performance criteria during the fixed three-year performance period. The number of shares issued upon vesting will range from 0% to 200% of the PSUs granted. The PSUs vest at the end of a three-year period based on average adjusted return on tangible equity as reported, adjusted for unusual gains/losses, merger expenses, and other items as approved by the compensation committee of the Company's board of directors. Compensation expense for the PSUs will be estimated each period based on the fair value of the stock at the grant date and the most probable outcome of the performance condition, adjusted for the passage of time within the vesting period of the awards. The Company granted 53,147 shares of performance based restricted stock units and recorded compensation cost of $1,001 during the year ended December 31, 2020. As of December 31, 2020, the Company determined the probability of meeting the performance criteria, and recorded compensation cost associated with a 181% vesting, when factoring in the conversion of PSUs to shares of common stock. During the year ended December 31, 2020. there were no forfeitures or vestings related to these grants. As of December 31, 2020, maximum unrecognized compensation cost related to the unvested PSUs was $2,482, and the remaining performance period over which the cost could be recognized was 2.1 years. Employee Stock Purchase Plan: The Company maintains an employee stock purchase plan (“ESPP”) under which employees, through payroll deductions, are able to purchase shares of Company common stock. The purchase price is 95% of the lower of the market price on the first or last day of the offering period. The maximum number of shares issuable during any offering period is 200,000 shares and a participant may not purchase more than 725 shares during any offering period (and, in any event, no more than $25 worth of common stock in any calendar year). During the years ended December 31, 2020 and 2019, there were 30,179 and 23,171 shares of common stock issued under the ESPP, respectively. As of December 31, 2020 and December 31, 2019, there were 2,379,006 and 2,409,185 shares available for issuance under the ESPP, respectively.

Related party transactions

Related party transactions	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Related party transactions	Related party transactions: (A) Loans: The Bank has made and expects to continue to make loans to the directors, certain management and executive officers of the Company and their affiliates in the ordinary course of business, in compliance with regulatory requirements. An analysis of loans to executive officers, certain management, and directors of the Bank and their affiliates is presented below: Loans outstanding at January 1, 2020 $ 30,880 New loans and advances 10,492 Change in related party status (3,462) Repayments (13,235) Loans outstanding at December 31, 2020 $ 24,675 Unfunded commitments to certain executive officers, certain management and directors and their associates totaled $23,059 and $19,404 at December 31, 2020 and 2019, respectively. (B) Deposits: The Bank held deposits from related parties totaling $245,084 and $238,781 as of December 31, 2020 and 2019, respectively. (C) Leases: The Bank leases various office spaces from entities owned by certain directors of the Company under varying terms. The Company had $53 and $86 in unamortized leasehold improvements related to these leases at December 31, 2020 and 2019, respectively. These improvements are being amortized over a term not to exceed the length of the lease. Lease expense for these properties totaled $510, $509, and $516 for the years ended December 31, 2020, 2019, and 2018, respectively. (D) Aviation time sharing agreement: The Company is a participant to aviation time sharing agreements with entities owned by a certain director of the Company. During the years ended December 31, 2020, 2019, and 2018, the Company made payments of

Quarterly Results of Operations

Quarterly Results of Operations (Unaudited)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations (Unaudited)	Quarterly Results of Operations (Unaudited) Summarized unaudited quarterly operating results for the Company for the years ending December 31, 2020 and 2019 are as follows: 2020 First Second Third Fourth Interest income $ 69,674 $ 65,607 $ 81,127 $ 98,236 Interest expense 13,425 10,270 12,299 12,992 Net interest income 56,249 55,337 68,828 85,244 Provision for credit losses 27,964 24,039 45,834 (3,231) Provision for credit losses on unfunded commitments 1,601 1,882 9,567 311 Net interest income after provision for loan losses 26,684 29,416 13,427 88,164 Noninterest income 42,700 81,491 97,026 80,638 Noninterest expense 68,559 80,579 118,092 109,855 Income tax expense (benefit) 80 7,455 (2,040) 13,337 Net income (loss) attributable to FB Financial Corporation and noncontrolling interest $ 745 $ 22,873 $ (5,599) $ 45,610 Net income applicable to noncontrolling interest — — — 8 Net income (loss) applicable to FB Financial Corporation $ 745 $ 22,873 $ (5,599) $ 45,602 Weighted average common shares outstanding: Basic 31,257,739 32,094,274 40,154,841 47,204,738 Fully diluted 31,734,112 32,506,417 40,637,745 47,791,659 Earnings per share Basic $ 0.02 $ 0.71 $ (0.14) $ 0.97 Fully diluted $ 0.02 $ 0.70 $ (0.14) $ 0.95 2019 First Second Third Fourth Interest income $ 65,933 $ 71,719 $ 73,242 $ 71,643 Interest expense 12,917 14,696 14,937 13,951 Net interest income 53,016 57,023 58,305 57,692 Provision for loan losses 1,391 881 1,831 2,950 Net interest income after provision for loan losses 51,625 56,142 56,474 54,742 Noninterest income 29,039 32,979 38,145 35,234 Noninterest expense 55,101 64,119 62,935 62,686 Income tax expense 5,975 6,314 7,718 5,718 Net income $ 19,588 $ 18,688 $ 23,966 $ 21,572 Weighted average common shares outstanding: Basic 30,786,684 30,859,596 30,899,583 30,934,092 Fully diluted 31,349,198 31,378,018 31,425,573 31,470,565 Earnings per share Basic $ 0.63 $ 0.60 $ 0.77 $ 0.69 Fully diluted $ 0.62 $ 0.59 $ 0.76 $ 0.68

Basis of presentation (Policies

Basis of presentation (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation: The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America and general banking industry. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and the reported results of operations for the year then ended. Actual results could differ significantly from those estimates. It is possible that the Company's estimate of the allowance for credit losses and determination of impairment of goodwill could change as a result of the continued impact of the COVID-19 pandemic on the economy. The resulting change in these estimates could be material to the Company's financial statements. The consolidated financial statements include the accounts of the Company, the Bank, and its’ wholly-owned subsidiaries, FirstBank Insurance, Inc., Investors Title Company, in addition to the newly acquired subsidiaries mentioned above. All significant intercompany accounts and transactions have been eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current period presentation without any impact on the reported amounts of net income or shareholders’ equity.
Cash flows	Cash flows:For purposes of reporting consolidated cash flows, cash and cash equivalents include cash on hand, amounts due from banks, federal funds sold and interest earning deposits in other financial institutions with maturities of less than 90 days at the date of purchase. These amounts are reported in the consolidated balance sheets caption “Cash and cash equivalents.” Net cash flows are reported for loans held for investment, deposits and short-term borrowings.
Cash and cash equivalents	Cash and cash equivalents:The Company considers all highly liquid unrestricted investments with a maturity of three months or less when purchased to be cash equivalents.
Investment securities	Investment securities: Debt securities are classified as held to maturity and carried at amortized cost, excluding accrued interest, when management has the positive intent and ability to hold them to maturity. Debt securities are classified as available-for-sale when they might be sold before maturity. Available-for-sale debt securities are carried at fair value, with unrealized holding gains and losses reported in other comprehensive income, net of applicable taxes. Beginning January 1, 2020, unrealized losses resulting from credit losses for available-for-sale debt securities are recognized in earnings as a provision for credit losses. Unrealized losses that do not result from credit losses are excluded from earnings and reported as accumulated other comprehensive income, net of applicable taxes, which is included in equity. Accrued interest receivable is separated from other components of amortized cost and presented separately on the consolidated balance sheets. Equity securities with readily determinable market values are carried at fair value on the balance sheet with any periodic changes in value made through adjustments to the statement of income. Equity securities without readily determinable market values are carried at cost less impairment and included in other assets on the consolidated balance sheets. Interest income includes the amortization and accretion of purchase premium and discount. Premiums and discounts on securities are amortized on the level-yield method anticipating prepayments based upon the prior three month average monthly prepayments when available. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. The Company evaluates available-for-sale securities for expected credit losses at least on a quarterly basis, and more frequently when economic or market concerns warrant such evaluation. For securities in an unrealized loss position, consideration is given to the extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. In analyzing an issuer’s financial condition, the Company considers whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred, and the results of reviews of the issuer’s financial condition. When credit losses are expected to occur, the amount of the expected credit loss recognized in earnings depends on the Company's intention to sell the security or if it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis. If the Company intends to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the expected credit loss recognized in earnings is equal to the entire difference between its amortized cost basis and its fair value at the date it was determined to be impaired due to credit losses or other factors. The previous amortized cost basis less the impairment recognized in earnings becomes the new amortized cost basis of the investment. However, if the Company does not intend to sell the security and it is not more likely than not to be required to sell the security before recovery of its amortized cost basis, the difference between the amortized cost and the fair value is separated into the amount representing the credit loss and the amount related to all other factors. If the Company determines a decline in fair value below the amortized cost basis of an available-for-sale investment security has resulted from credit related factors, beginning January 1, 2020 with the adoption of CECL, the Company records a credit loss through an allowance for credit losses. The allowance for credit losses is limited by the amount that the fair value is less than amortized cost. The amount of the allowance for credit losses is determined based on the present value of cash flows expected to be collected and is recognized as a charge to earnings. The amount of the impairment related to other, non-credit related, factors is recognized in other comprehensive income, net of applicable taxes. The Company did not record any provision for credit losses for its available-for-sale debt securities during the year ended December 31, 2020, as the majority of the investment portfolio is government guaranteed and declines in fair value below amortized cost were determined to be non-credit related.
Federal Home Loan Bank (FHLB) stock	Federal Home Loan Bank (FHLB) stock:The Bank accounts for its investments in FHLB stock in accordance with FASB ASC Topic 942-325 "Financial Services-Depository and Lending-Investments-Other." FHLB stock are equity securities that do not have a readily determinable fair value because its ownership is restricted and lacks a market. FHLB stock is carried at cost and evaluated for impairment.
Loans held for sale	Loans held for sale: Loans originated and intended for sale in the secondary market, primarily mortgage loans, are carried at fair value as permitted under the guidance in ASC 825, “Financial Instruments” (“ASC 825”). Net gains (losses) of $24,233, $(2,861), and $(4,539) resulting from fair value changes of these mortgage loans were recorded in income during the years ended December 31, 2020, 2019 and 2018, respectively. The amount does not reflect changes in fair values of related derivative instruments used to hedge exposure to market-related risks associated with these mortgage loans. The change in fair value of both mortgage loans held for sale and the related derivative instruments are recorded in “Mortgage banking income” in the Consolidated Statements of Income. Gains and losses are recognized in Mortgage banking income on the consolidated statements of income at the time the loan is closed. Pass through origination costs and related loan fees are also included in “Mortgage banking income”. Periodically, the Bank will transfer mortgage loans originated for sale in the secondary markets into the loan portfolio based on current market conditions, the overall secondary marketability of the loan and the status of the loan. During the years ended December 31, 2020, 2019, and 2018, the Bank transferred $55,766, $12,259, and $14,732, respectively, of residential mortgage loans into its loans held for investment portfolio. The loans are transferred into the portfolio at fair value at the date of transfer. Additionally, occasionally the Bank will transfer loans from the held for investment portfolio into loans held for sale. At the time of the transfer, loans are marked to fair value through the allowance for credit losses and reclassified to loans held for sale. During the year ended December 31, 2020, the Company transferred $2,116 from the portfolio to loans held for sale. During the year ended December 31, 2018, the Company transferred $11,888 from the portfolio to loans held for sale,resulting in an adjustment to the allowance for loan losses of $349. Government National Mortgage Association (GNMA) optional repurchase programs allow financial institutions to buy back individual delinquent mortgage loans that meet certain criteria from the securitized loan pool for which the institution provides servicing and was the original transferor. At the servicer’s option and without GNMA’s prior authorization, the servicer may repurchase such a delinquent loan for an amount equal to 100 percent of the remaining principal balance of the loan. Under FASB ASC Topic 860, “Transfers and Servicing,” this buy-back option is considered a conditional option until the delinquency criteria are met, at which time the option becomes unconditional. When the Company is deemed to have regained effective control over these loans under the unconditional buy-back option, the loans can no longer be reported as sold and must be brought back onto the balance sheet, regardless of whether the Company intends to exercise the buy-back option if the buyback option provides the transferor a more-than-trivial benefit. When this criteria is met and these are repurchased, after a period of borrower performance, the loans are transferred to loans held for sale at fair value and are able to be repooled into new Ginnie Mae guaranteed securities. During the years ended December 31, 2020 and 2019, the Company transferred $9,367 and $7,891, respectively, of these repurchased loans from loans held for investment to loans held for sale. There was no such activity during the year ended December 21, 2018. As of December 31, 2020, and 2019, there were $151,184 and $51,705, respectively, of delinquent GNMA loans that had previously been sold which the Company had the option to repurchase; however, the Company determined there not to be a "more-than-trivial benefit" based on an analysis of interest rates and assessment of potential reputational risk associated with these loans. As such, the Company did not record these loans on the balance sheets. During the year ended December 31, 2020 , the Company acquired a portfolio of commercial loans, including shared national credits and institutional healthcare loans, as part of the Franklin transaction that the Company has elected to account for as held for sale. Changes in fair value from the acquisition date fair value are included in 'other noninterest income' on the consolidated statement of income.
Loans (excluding purchase credit impaired loans)	Loans (excluding purchased credit deteriorated loans):Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are stated at the principal amount outstanding less any purchase accounting discount net of any accretion recognized to date. Interest on loans is recognized as income by using the simple interest method on daily balances of the principal amount outstanding plus any accretion of purchase accounting discounts.Loans on which the accrual of interest has been discontinued are designated as nonaccrual loans. Accrual of interest is discontinued on loans past due 90 days or more unless the credit is well secured and in the process of collection. Also, a loan may be placed on nonaccrual status prior to becoming past due 90 days if management believes, after considering economic and business conditions and collection efforts, that the borrower’s financial condition is such that collection of principal or interest is doubtful. The decision to place a loan on nonaccrual status prior to becoming past due 90 days is based on an evaluation of the borrower’s financial condition, collateral liquidation value, economic and business conditions and other factors that affect the borrower’s ability to pay. When a loan is placed on nonaccrual status, the accrued but unpaid interest is charged against current period operations. Thereafter, interest on nonaccrual loans is recognized only as received if future collection of principal is probable. If the collectability of outstanding principal is doubtful, interest received is applied as a reduction of principal. A loan may be restored to accrual status when principal and interest are no longer past due or it otherwise becomes both well secured and collectability is reasonably assured. The Company continues to monitor the level of accrued interest receivable, however an allowance for credit losses was not required as of December 31, 2020.
Allowance for credit losses	Allowance for credit losses: The allowance for credit losses represents the portion of the loan's amortized cost basis that the Company does not expect to collect due to credit losses over the loan's life, considering past events, current conditions, and reasonable and supportable forecasts of future economic conditions considering macroeconomic forecasts. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. The allowance for credit losses is based on the loan's amortized cost basis, excluding accrued interest receivable, as the Company promptly charges off uncollectible accrued interest receivable. Management’s determination of the appropriateness of the allowance is based on periodic evaluation of the loan portfolio, lending-related commitments and other relevant factors, including macroeconomic forecasts and historical loss rates. In future quarters, the Company may update information and forecasts that may cause significant changes in the estimate in those future quarters. As of January 1, 2020, the Company’s policy for the allowance for credit losses changed with the adoption of CECL. As permitted, the new guidance was implemented using a modified retrospective approach with the impact of the initial adoption being recorded through retained earnings at January 1, 2020, with no restatement of prior periods. Prior to adopting CECL, the Company calculated the allowance using an incurred loss approach. Beginning January 1, 2020, the Company calculates the allowance using a lifetime expected credit loss approach as described in the previous paragraph. See Note 5, "Loans and allowance for credit losses" for additional details related to the Company's specific calculation methodology. The allowance for credit losses is the Company’s best estimate. Actual losses may differ from the December 31, 2020 allowance for credit loss as the CECL estimate is sensitive to economic forecasts and management judgment. The following portfolio segments have been identified: Commercial and industrial loans. The Company provides a mix of variable and fixed rate commercial and industrial loans. Commercial and industrial loans are typically made to small- and medium-sized manufacturing, wholesale, retail and service businesses for working capital and operating needs and business expansions, including the purchase of capital equipment and loans made to farmers relating to their operations. This category also includes loans secured by manufactured housing receivables. Commercial and industrial loans generally include lines of credit and loans with maturities of five years or less. The loans are generally made with operating cash flows as the primary source of repayment, but may also include collateralization by inventory, accounts receivable, equipment and/or personal guarantees. The ability of the borrower to collect accounts receivable, and to turn inventory into sales are risk factors in the repayment of the loan. Construction loans. Construction loans include commercial construction, land acquisition and land development loans and single-family interim construction loans to small- and medium-sized businesses and individuals. These loans are generally secured by the land or the real property being built and are made based on our assessment of the value of the property on an as-completed basis. We expect to continue to make construction loans at a similar pace so long as demand continues and the market for and values of such properties remain stable or continue to improve in our markets. These loans can carry risk of repayment when projects incur cost overruns, have an increase in the price of building materials, encounter zoning and environmental issues, or encounter other factors that may affect the completion of a project on time and on budget. Additionally, repayment risk may be negatively impacted when the market experiences a deterioration in the value of real estate. Residential real estate 1-4 family mortgage loans . The Company’s residential real estate 1-4 family mortgage loans are primarily made with respect to and secured by single family homes, which are both owner-occupied and investor owned and include manufactured homes with real estate. The Company intends to continue to make residential 1-4 family housing loans at a similar pace, so long as housing values in our markets do not deteriorate from current prevailing levels and we are able to make such loans consistent with our current credit and underwriting standards. First lien residential 1-4 family mortgages may be affected by unemployment or underemployment and deteriorating market values of real estate. Residential line of credit loans. The Company’s residential line of credit loans are primarily revolving, open-end lines of credit secured by 1-4 residential properties. The Company intends to continue to make home equity loans if housing values in our markets do not deteriorate from current prevailing levels and we are able to make such loans consistent with our current credit and underwriting standards. Second lien residential 1-4 family mortgages may be affected by unemployment or underemployment and deteriorating market values of real estate. Multi-family residential loans. The Company’s multi-family residential loans are primarily secured by multi-family properties, such as apartments and condominium buildings. These loans also may be affected by unemployment or underemployment and deteriorating market values of real estate. Commercial real estate loans . The Company’s commercial real estate owner-occupied loans include loans to finance commercial real estate owner occupied properties for various purposes including use as offices, warehouses, production facilities, health care facilities, retail centers, restaurants, churches and agricultural based facilities. Commercial real estate owner-occupied loans are typically repaid through the ongoing business operations of the borrower, and hence are dependent on the success of the underlying business for repayment and are more exposed to general economic conditions. Commercial real estate non-owner occupied loans . The Company’s commercial real estate non-owner occupied loans include loans to finance commercial real estate non-owner occupied investment properties for various purposes including use as offices, warehouses, health care facilities, hotels, mixed-use residential/commercial, manufactured housing communities, retail centers, assisted living facilities and agricultural based facilities. Commercial real estate non-owner occupied loans are typically repaid with the funds received from the sale of the completed property or rental proceeds from such property, and are therefore more sensitive to adverse conditions in the real estate market, which can also affected by general economic conditions. Consumer and other loans . The Company’s consumer and other loans include loans to individuals for personal, family and household purposes, including car, boat and other recreational vehicle loans, manufactured homes without real estate, and personal lines of credit. Consumer loans are generally secured by vehicles and other household goods. The collateral securing consumer loans may depreciate over time. The company seeks to minimize these risks through its underwriting standards. Other loans also include loans to states and political subdivisions in the U.S. These loans are generally subject to the risk that the borrowing municipality or political subdivision may lose a significant portion of its tax base or that the project for which the loan was made may produce inadequate revenue.
Business combinations and accounting for acquired loans with credit deterioration and off-balance sheet financial instruments	Business combinations, accounting for acquired loans with credit deterioration and off-balance sheet financial instruments: Business combinations are accounted for by applying the acquisition method in accordance with Accounting Standards Codification ("ASC") 805, “Business Combinations” (“ASC 805”). Under the acquisition method, identifiable assets acquired and liabilities assumed and any non-controlling interest in the acquiree at the acquisition date are measured at their fair values as of that date. Any excess of the purchase price over fair value of net assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including any other identifiable intangible assets, exceed the purchase price, a bargain purchase gain is recognized. Results of operations of acquired entities are included in the consolidated statements of income from the date of acquisition. Beginning January 1, 2020, loans acquired in business combinations with evidence of more-than-insignificant credit deterioration since origination are considered to be Purchased Credit Deteriorated ("PCD"). The Company developed multiple criteria to assess the presence of more–than–insignificant credit deterioration in acquired loans, mainly focused on changes in credit quality and payment status. While general criteria have been established, each acquisition will vary in its specific facts and circumstances and the Company will apply judgment around PCD identification for each individual acquisition based on their unique portfolio mix and risks identified. The Company adopted ASC 326 using the prospective transition approach for loans previously classified as purchased credit impaired ("PCI") and accounted for under ASC 310-30. In accordance with the standard, management did not reassess whether PCI assets met the criteria of PCD assets as of the date of adoption and all PCI loans were transitioned to PCD loans upon adoption. Under PCD accounting,the amount of expected credit losses as of the acquisition date is added to the purchase price of the PCD loan. This establishes the amortized cost basis of the PCD loan. The difference between the unpaid principal balance of the PCD loan and the amortized cost basis of the PCD loan as of the acquisition date is the non-credit discount. Interest income for a PCD loan is recognized by accreting the amortized cost basis of the PCD loan to its contractual cash flows. The discount related to estimated credit losses on acquisition recorded as an allowance for credit losses will not be accreted into interest income. Only the noncredit-related discount will be accreted into interest income and subsequent adjustments to expected credit losses will flow through the provision for credit losses on the income statement. Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded, unless considered derivatives. For loan commitments that are not accounted for as derivatives and when the obligation is not unconditionally cancellable by the Company, the Company applies the CECL methodology to estimate the expected credit loss on off-balance-sheet commitments. The estimate of expected credit losses for off-balance-sheet credit commitments is recognized as a liability. When the loan is funded, an allowance for expected credit losses is estimated for that loan using the CECL methodology, and the liability for off-balance-sheet commitments is reduced. When applying the CECL methodology to estimate the expected credit loss, the Company considers the likelihood that funding will occur, the contractual period of exposure to credit loss, the risk of loss, historical loss experience, and current conditions along with expectations of future economic conditions.
Premises and equipment	Premises and equipment: Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. Provisions for depreciation are computed principally on the straight-line method and are charged to occupancy expense over the estimated useful lives of the assets. Maintenance agreements are amortized to expense over the period of time covered by the agreement. Costs of major additions, replacements or improvements are capitalized while expenditures for maintenance and repairs are charged to expense as incurred. For financial statement purposes, the estimated useful life for premises is the lesser of the remaining useful life per third party appraisal or forty years, for furniture and fixtures the estimated useful life is seven three
Other real estate owned	Other real estate owned:Real estate acquired through, or in lieu of, loan foreclosure is initially recorded at fair value less the estimated cost to sell at the date of foreclosure, which may establish a new cost basis. Other real estate owned may also include excess facilities and properties held for sale as described in Note 8. Physical possession of residential real estate property collateralizing a consumer mortgage loan occurs when legal title is obtained upon completion of foreclosure or when the borrower conveys all interest in the property to satisfy the loan. After initial measurement, valuations are periodically performed by management and the asset is carried at the lower of carrying amount or fair value less costs to sell. Revenue and expenses from operations are included in other noninterest income and noninterest expenses. Losses due to the valuation of the property are included in gain (loss) on sales or write-downs of other real estate owned.
Leases	Leases:The Company leases certain banking, mortgage and operations locations. Effective January 1, 2019, the Company records leases on the balance sheet in the form of a lease liability for the present value of future minimum payments under the lease terms and a right-of-use asset equal to the lease liability adjusted for items such as deferred or prepaid rent, incentive liabilities, leasehold intangibles and any impairment of the right-of-use asset. In determining whether a contract contains a lease, management conducts an analysis at lease inception to ensure an asset was specifically identified and the Company has control of use of the asset. For contracts determined to be leases entered into after January 1, 2019, the Company performs additional analysis to determine whether the lease should be classified as a finance or operating lease. The Company considers a lease to be a finance lease if future minimum lease payments amount to greater than 90% of the asset's fair value or if the lease term is equal to or greater than 75% of the asset's estimated economic useful life. As of December 31, 2020, the Company has one finance lease that resulted from the Franklin transaction. As of December 31, 2019, the Company did not have any leases that were determined to be finance leases. The Company does not record leases on the consolidated balance sheets that are classified as short term (less than one year). Additionally, the Company has not recorded equipment leases or leases in which the Company is the lessor on the consolidated balance sheets as these are not material to the Company. At lease inception, the Company determines the lease term by adding together the minimum lease term and all optional renewal periods that it is reasonably certain to renew. This determination is at management's full discretion and is made through consideration of the asset, market conditions, competition and entity based economic conditions, among other factors. The lease term is used in the economic life test and also to calculate straight-line rent expense. The depreciable life of leasehold improvements is limited by the estimated lease term, including renewals. Operating leases are expensed on a straight-line basis over the life of the lease beginning when the lease commences. Rent expense and variable lease expense are included in occupancy and equipment expense on the Company's Consolidated statements of income. The Company's variable lease expense include rent escalators that are based on the Consumer Price Index or market conditions and include items such as common area maintenance, utilities, parking, property taxes, insurance and other costs associated with the lease. There are no residual value guarantees or restrictions or covenants imposed by leases that will impact the Company's ability to pay dividends or cause the Company to incur additional expenses. The discount rate used in determining the lease liability is based upon incremental borrowing rates the Company could obtain for similar loans as of the date of commencement or renewal.
Mortgage servicing rights	Mortgage servicing rights: The Company accounts for its mortgage servicing rights under the fair value option as permitted under ASC 860-50-35, "Transfers and Servicing". The Company retains the right to service certain mortgage loans that it sells to secondary market investors. The retained mortgage servicing right is initially recorded at the fair value of future net cash flows expected to be realized for performing servicing activities. Fair value is determined using an income approach with various assumptions including expected cash flows, prepayment speeds, market discount rates, servicing costs, and other factors. These mortgage servicing rights are recognized as a separate asset on the date the corresponding mortgage loan is sold. Subsequent changes in fair value, including the write downs due to pay offs and paydowns, are recorded in earnings in Mortgage banking income.
Transfers of financial assets	Transfers of financial assets:Transfers of financial assets are accounted for as sales, when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
Goodwill and other intangibles	Goodwill and other intangibles:Goodwill represents the excess of the cost of an acquisition over the fair value of the net assets acquired. Goodwill impairment testing is performed annually or more frequently if events or circumstances indicate possible impairment. Goodwill is assigned to the Company’s reporting units, Banking or Mortgage as applicable. Goodwill is evaluated for impairment by first performing a qualitative evaluation to determine whether it is necessary to perform the quantitative goodwill impairment test. The qualitative evaluation is an assessment of factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount, including goodwill.  If an entity does a qualitative assessment and determines that it is not more likely than not the fair value of a reporting unit is less than its carrying amount, then goodwill of the reporting unit is not considered impaired, and it is not necessary to continue to the quantitative goodwill impairment test. If the estimated implied fair value of goodwill is less than the carrying amount, an impairment loss would be recognized in noninterest expense to reduce the carrying amount to the estimated implied fair value, which could be material to our operating results for any particular reporting period.Other intangible assets consist of core deposit intangible assets arising from whole bank and branch acquisitions in addition to both a customer trust intangible and manufactured housing loan servicing intangible. All intangible assets are initially measured at fair value and then amortized over their estimated useful lives. See Note 9,"Goodwill and intangible assets" for additional information on other intangibles.
Income taxes	Income taxes: Income tax expense is the total of the current year income tax due and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded.
Long-lived assets	Long-lived assets:Premises and equipment, core deposit intangible assets, and other long-lived assets are reviewed for impairment when events indicate their carrying amount may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value.
Derivative financial instruments and hedging activities	Derivative financial instruments and hedging activities: All derivative financial instruments are recorded at their fair values in other assets or other liabilities in the consolidated balance sheets in accordance with ASC 815, “Derivatives and Hedging.” If derivative financial instruments are designated as hedges of fair values, both the change in the fair value of the hedge and the hedged item are included in current earnings. If derivative financial instruments are not designated as hedges, only the change in the fair value of the derivative instrument is included in current earnings. Cash flow hedges are utilized to mitigate the exposure to variability in expected future cash flows or other types of forecasted transactions. For the Company’s derivatives designated as cash flow hedges, changes in the fair value of cash flow hedges are, to the extent that the hedging relationship is effective, recorded as other comprehensive income and are subsequently recognized in earnings at the same time that the hedged item is recognized in earnings. The ineffective portions of the changes in fair value of the hedging instruments are immediately recognized in earnings. The assessment of the effectiveness of the hedging relationship is evaluated under the hypothetical derivative method. The Company also utilizes derivative instruments that are not designated as hedging instruments. The Company enters into interest rate cap and/or floor agreements with its customers and then enters into an offsetting derivative contract position with other financial institutions to mitigate the interest rate risk associated with these customer contracts. Because these derivative instruments are not designated as hedging instruments, changes in the fair value of the derivative instruments are recognized currently in earnings. The Company also enters into commitments to originate loans whereby the interest rate on the loan is determined prior to funding (rate-lock commitments). Rate-lock commitments on mortgage loans that are intended to be sold are considered to be derivatives. Accordingly, such commitments, along with any related fees received from potential borrowers, are recorded at fair value in other assets or liabilities, with changes in fair value recorded in the line item “Mortgage banking income” on the Consolidated Statements of Income. Fair value is based on fees currently charged to enter into similar agreements, and for fixed-rate commitments, the difference between current levels of interest rates and the committed rates is also considered. The Company utilizes forward loan sale contracts and forward sales of residential mortgage-backed securities to mitigate the interest rate risk inherent in the Company’s mortgage loan pipeline and held-for-sale portfolio. Forward sale contracts are contracts for delayed delivery of mortgage loans or a group of loans pooled as mortgage-backed securities. The Company agrees to deliver on a specified future date, a specified instrument, at a specified price or yield. However, the contract may allow for cash settlement. The credit risk inherent to the Company arises from the potential inability of counterparties to meet the terms of their contracts. In the event of non-acceptance by the counterparty, the Company would be subject to the credit and inherent (or market) risk of the loans retained. Such contracts are accounted for as derivatives and, along with related fees paid to investor are recorded at fair value in derivative assets or liabilities, with changes in fair value recorded in the line item “Mortgage banking income” on the Consolidated Statements of Income. Fair value is based on the estimated amounts that the Company would receive or pay to terminate the commitment at the reporting date. The Company utilizes two methods to deliver mortgage loans sold to an investor. Under a “best efforts” sales agreement, the Company enters into a sales agreement with an investor in the secondary market to sell the loan when an interest rate-lock commitment is entered into with a customer, as described above. Under a “best efforts” sales agreement, the Company is obligated to sell the mortgage loan to the investor only if the loan is closed and funded. Thus, the Company will not incur any liability to an investor if the mortgage loan commitment in the pipeline fails to close. The Company also utilizes “mandatory delivery” sales agreements. Under a mandatory delivery sales agreement, the Company commits to deliver a certain principal amount of mortgage loans to an investor at a specified price and delivery date. Penalties are paid to the investor should the Company fail to satisfy the contract. Mandatory commitments are recorded at fair value in the Company’s Consolidated Balance Sheets. Gains and losses arising from changes in the valuation of these commitments are recognized currently in earnings and are reflected under the line item “Mortgage banking income” on the Consolidated Statements of Income.
Lender risk account	Lender risk account:During 2018, the Company began selling qualified mortgage loans to FHLB-Cincinnati via the Mortgage Purchase Program (“MPP”).  All mortgage loans purchased from members through the MPP are held on the FHLB’s balance sheet. FHLB does not securitize MPP loans for sale to other investors.  They mitigate their credit risk exposure through their underwriting and pool composition requirements and through the establishment of the Lender Risk Account (“LRA”) credit enhancement. The LRA protects the FHLB against possible credit losses by setting aside a portion of the initial purchase price into a performance based escrow account that can be used to offset possible loan losses.  The LRA amount is established as a percentage applied to the sum of the initial unpaid principal balance of each mortgage in the aggregated pool at the time of the purchase of the mortgage as determined by the FHLB-Cincinnati and is funded by the deduction from the proceeds of sale of each mortgage in the aggregated pool to the FHLB-Cincinnati.  As of December 31, 2020 and 2019, the Company had on deposit with the FHLB-Cincinnati $12,729 and $11,225, respectively, in these LRA’s. Additionally, as of December 31, 2020 and 2019, the Company estimated the guaranty account to be $6,183 and $5,546, respectively. The Company bears the risk of receiving less than 100% of its LRA contribution in the event of losses, either by the Company or other members selling mortgages in the aggregated pool.  Any losses will be deducted first from the individual LRA contribution of the institution that sold the mortgage of which the loss was incurred. If losses incurred in the aggregated pool are greater than the member’s LRA contribution, such losses will be deducted from the LRA contribution of other members selling mortgages in that aggregated pool.  Any portion of the LRA not used to pay losses will be released over a thirty year period and will not start until the end of five years after the initial fill-up period.
Comprehensive income	Comprehensive income:Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on available-for-sale securities and derivatives designated as cash flow hedges, net of taxes.
Loss contingencies	Loss contingencies:Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Management does not believe there are such matters that will have a material effect on the financial statements.
Securities sold under agreements to repurchase	Securities sold under agreements to repurchase:The Company routinely sells securities to certain customers and then repurchases the securities the next business day. Securities sold under agreements to repurchase are recorded on the consolidated balance sheets at the amount of cash received in connection with each transaction in the line item "Borrowings". These are secured liabilities and are not covered by the Federal Deposit Insurance Corporation ("FDIC"). See Note 14, "Borrowings" in the Notes to the consolidated financial statements for additional details regarding securities sold under agreements to repurchase.
Advertising expense	Advertising expense:Advertising costs, including costs related to internet mortgage marketing, lead generation, and related costs, are expensed as incurred.
Earnings per common share	Earnings per common share: Basic earnings per common share ("EPS") excludes dilution and is computed by dividing earnings attributable to common shareholders by the weighted average number of common shares outstanding during the period. Diluted EPS includes the dilutive effect of additional potential common shares issuable under the restricted stock units granted but not yet vested and distributable. Diluted EPS is computed by dividing earnings attributable to common shareholders by the weighted average number of common shares outstanding for the year, plus an incremental number of common-equivalent shares computed using the treasury stock method. Unvested share-based payment awards, which include the right to receive non-forfeitable dividends or dividend equivalents, are considered to participate with common shareholders in undistributed earnings for purposes of computing EPS. Companies that have such participating securities, including the Company, are required to calculate basic and diluted EPS using the two-class method. Certain restricted stock awards granted by the Company include non-forfeitable dividend equivalents and are considered participating securities. Calculations of EPS under the two-class method (i) exclude from the numerator any dividends paid or owed on participating securities and any undistributed earnings considered to be attributable to participating securities and (ii) exclude from the denominator the dilutive impact of the participating securities.
Segment reporting	Segment reporting: The Company’s Mortgage division represents a distinct reportable segment that differs from the Company’s primary business of Banking.
Stock-based compensation	Stock-based compensation: The Company grants restricted stock units ("RSUs") under compensation arrangements for the benefit of employees, executive officers, and directors. Restricted stock unit grants are subject to time-based vesting. The total number of restricted stock units granted represents the maximum number of restricted stock units eligible to vest based upon the service conditions set forth in the grant agreements. During 2020, the Company began awarding performance-based restricted stock units ("PSUs") to executives and other officers and employees. Under the terms of the award, the number of units that will vest and convert to shares of common stock will be based on the extent to which the Company achieves specified performance criteria during a fixed three-year performance period. Stock-based compensation expense is recognized in accordance with ASC 718-20, “ Compensation – Stock Compensation Awards Classified as Equity”.
Subsequent events	Subsequent Events:ASC Topic 855, "Subsequent Events", establishes general standards of accounting for and disclosure of events that occur after the balance sheet date but before financial statements are issued. The Company evaluated all events or transactions that occurred after December 31, 2020 through the date of the issued financial statements.
Recently adopted accounting policies and Newly issued not yet effective accounting standards	Recently adopted accounting standards: In June 2016, the Financial Accounting Standards Board ("FASB") issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 and its subsequent amendments issued by the FASB requires the measurement of all current expected credit losses for financial assets (including off-balance sheet credit exposures) held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Additionally, the update requires enhanced disclosures related to the significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. The new methodology requires institutions to calculate all probable and estimable losses that are expected to be incurred through the financial asset's entire life through a provision for credit losses, including certain loans obtained as a result of any acquisition. For available-for-sale debt securities that have experienced a deterioration in credit, Topic 326 requires an allowance for credit losses to be recognized, instead of a direct write-down, which was previously required under the other-than-temporary impairment ("OTTI") model. Topic 326 eliminates the concept of OTTI impairment and instead focuses on determining whether any impairment is a result of a credit loss or other factors. As a result, the standard says the Company may not use the length of time a debt security has been in an unrealized loss position as a factor, either by itself or in combination with other factors, to conclude that a credit loss does not exist, as the Company was previously allowed under the OTTI model. ASU 2016-13 eliminates the existing guidance for PCI loans, but requires an allowance for purchased financial assets with more than insignificant deterioration since origination to be determined in a manner similar to that of other financial assets measured at amortized cost; however, the initial allowance will be added to the purchase price rather than recorded as provision expense referred herein as the PCD asset gross-up approach. The Company applied the new PCD asset gross-up approach at transition to all assets that were accounted for as PCI prior to adoption. Any change in the allowance for credit losses for these assets as a result of applying the new guidance is accounted for as an adjustment to the asset’s amortized cost basis and not as a cumulative-effect adjustment to beginning retained earnings. Additionally, ASU 2016-13 requires additional disclosures related to loans and debt securities. See Note 4, “Investment securities” and Note 5, “Loans and allowance for credit losses” for these disclosures. The Company formed a cross–functional working group to oversee the adoption of CECL at the effective date. The working group developed a project plan focused on understanding the new standard, researching issues, identifying data needs for modeling inputs, technology requirements, modeling considerations, and ensuring overarching governance was achieved for each objective and milestone. The key data driver for each model was identified, populated, and internally validated. The Company also completed data and model validation testing. The Company has performed model sensitivity analysis, developed a framework for qualitative adjustments, created supporting analytics, and executed the enhanced governance and approval process. Internal controls related to the CECL process were finalized prior to adoption. ASU 2016-13 was adopted effective January 1, 2020 using a modified retrospective approach with no adjustments to prior period comparative financial statements. Upon adoption, the Company recorded a cumulative effective adjustment to decrease retained earnings by $25,018, with corresponding adjustments to the allowance for credit losses on loans and unfunded commitments in addition to recording a deferred tax asset on its consolidated balance sheet. As of that date, the Company also recorded a cumulative effect adjustment to gross-up the amortized cost amount of its PCD loans by $558, with a corresponding adjustment to the allowance for credit losses on its consolidated balance sheet. In December 2018, the OCC, the Board of Governors of the Federal Reserve System, and the FDIC approved a final rule to address changes to credit loss accounting under GAAP, including banking organizations’ implementation of CECL. The final rule provides banking organizations the option to phase in over a three-year period the day-one adverse effects on regulatory capital that may result from the adoption of the new accounting standard. In March 2020, the OCC, the Board of Governors of the Federal Reserve System, and the FDIC announced an interim final rule, which became final on September 30, 2020 to delay the estimated impact on regulatory capital stemming from the implementation of CECL. The final rule maintains the three-year transition option in the previous rule and provides banks the option to delay for two years an estimate of CECL’s effect on regulatory capital, relative to the incurred loss methodology’s effect on regulatory capital, followed by a three-year transition period (five-year transition option). The Company elected the five-year capital transition relief option. In January 2017, the FASB issued ASU 2017-04, “Intangibles – Goodwill and Other (Topic 350) – Simplifying the Test for Goodwill Impairment.” ASU 2017-04 eliminates step two from the goodwill impairment test. Instead, an entity may perform only step one of its quantitative goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and then recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Entities have the option to perform a qualitative assessment for a reporting unit to determine if the quantitative step one impairment test is necessary. ASU 2017-04 became effective for the Company on January 1, 2020. The adoption of this standard did not have any impact on the Company's consolidated financial statements or disclosures. In August 2018, the FASB issued "Accounting Standards Update 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurements." This update is part of the disclosure framework project and eliminates certain disclosure requirements for fair value measurements, requires entities to disclose new information, and modifies existing disclosure requirements. The update became effective on January 1, 2020 and did not have an impact on the Company's consolidated financial statements or disclosures. In March 2019, FASB issued ASU 2019-01, "Leases (Topic 842): Codification Improvements", which aligns the guidance for fair value of the underlying assets by lessors that are not manufacturers or dealers in Topic 842 with that of existing guidance. As a result, the fair value of the underlying asset at lease commencement is its cost, reflecting any volume or trade discounts that may apply. However, if there has been a significant lapse of time between when the underlying asset is acquired and when the lease commences, the definition of fair value in Topic 820, Fair Value Measurement should be applied. ASU No. 2019-01 also requires lessors within the scope of Topic 942, "Financial Services—Depository and Lending", to present all “principal payments received under leases” within investing activities. The adoption of this standard on January 1, 2020 did not have a material impact on the Company's consolidated financial statements or disclosures. In April 2019, the FASB issued ASU No. 2019-04, " Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments". The amendments related to Topic 326 address accrued interest, transfers between classifications or categories for loans and debt securities, recoveries, vintage disclosures, and contractual extensions and renewal options and became effective for annual periods and interim periods within those annual periods beginning after December 15, 2019. The improvements and clarifications related to Topic 815 address partial-term fair value hedges of interest-rate risk, amortization, and disclosure of fair value hedge basis adjustments and consideration of hedged contractually specified interest rates under the hypothetical method and became effective for the annual reporting period beginning January 1, 2020. The amendments related to Topic 825 contain various improvements to ASU 2016-01, including scope; held-to-maturity debt securities fair value disclosures; and remeasurement of equity securities at historical exchange rates and became effective as of January 1, 2020. The amendments in this update did not have a material impact on the financial statements. Newly issued not yet effective accounting standards: In June 2018, FASB issued ASU 2018-07, "Compensation-Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting", which expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. Consistent with the accounting for employee share-based payment awards, nonemployee share-based payment awards will be measured at grant-date fair value of the equity instruments obligated to be issued when the good has been delivered or the service rendered and any other conditions necessary to earn the right to benefit from the instruments have been satisfied. This ASU is effective for all entities for fiscal years beginnings after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. The Company adopted the update effective January 1, 2021. The adoption of this standard did not have a significant impact on the consolidated financial statements or disclosures.

Basis of presentation (Tables)

Basis of presentation (Tables)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Schedule of Basic and Diluted Earnings Per Common Share Calculation	The following is a summary of the basic and diluted earnings per common share calculation for each of the periods presented: Year Ended December 31, 2020 2019 2018 Basic earnings per common share calculation: Net income applicable to FB Financial Corporation $ 63,621 $ 83,814 $ 80,236 Dividends paid on and undistributed earnings allocated to — (447) (428) Earnings available to common shareholders $ 63,621 $ 83,367 $ 79,808 Weighted average basic shares outstanding 37,621,720 30,870,474 30,675,755 Basic earnings per common share $ 1.69 $ 2.70 $ 2.60 Diluted earnings per common share: Earnings available to common shareholders 63,621 83,367 79,808 Weighted average basic shares outstanding 37,621,720 30,870,474 30,675,755 Weighted average diluted shares contingently issuable (1) 478,024 532,423 639,226 Weighted average diluted shares outstanding 38,099,744 31,402,897 31,314,981 Diluted earnings per common share $ 1.67 $ 2.65 $ 2.55 (1)
Schedule of Impact on the Consolidated Balance Sheet of Adoption of ASU 2016-13	A summary of the impact to the consolidated balance sheet as of the adoption date is presented in the table below: Balance before adoption of ASC 326 Cumulative effect adjustment to adopt ASC 326 Impact of the adjustment to adopt ASC 326 Balance at January 1, 2020 (post ASC 326 adoption) ASSETS: Loans $ 4,409,642 $ 558 Increase $ 4,410,200 Allowance for credit losses (31,139) (31,446) Increase (62,585) Total impact to assets $ (30,888) Net decrease LIABILITIES AND EQUITY: Allowance for credit losses on unfunded commitments $ — $ 2,947 Increase $ 2,947 Net deferred tax liability 20,490 (8,817) Decrease 11,673 Retained earnings 293,524 (25,018) Decrease 268,506 Total impact to liabilities and equity $ (30,888) Net decrease

Mergers and acquisitions (Table

Mergers and acquisitions (Tables)	12 Months Ended
	Dec. 31, 2020
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the estimated fair values of assets acquired and liabilities assumed as of the respective acquisition dates: As of August 15, 2020 As of February 14, 2020 Franklin Financial Network, Inc. FNB Financial Corp. ASSETS Cash and cash equivalents $ 284,004 $ 10,774 Investments 373,462 50,594 Mortgage loans held for sale, at fair value 38,740 — Commercial loans held for sale, at fair value 326,206 — Loans held for investment, net of fair value adjustments 2,427,527 182,171 Allowance for credit losses on PCD loans (24,831) (669) Premises and equipment 45,471 8,049 Operating lease right-of-use assets 23,958 14 Mortgage servicing rights 5,111 — Core deposit intangible 7,670 2,490 Other assets 124,571 4,795 Total assets $ 3,631,889 $ 258,218 LIABILITIES Deposits: Noninterest-bearing $ 505,374 $ 63,531 Interest-bearing 1,783,379 26,451 Money market and savings 342,093 37,002 Customer time deposits 383,433 82,551 Brokered and internet time deposits 107,452 — Total deposits 3,121,731 209,535 Borrowings 62,435 3,192 Operating lease liabilities 24,330 14 Accrued expenses and other liabilities 12,661 1,754 Total liabilities assumed 3,221,157 214,495 Noncontrolling interests acquired 93 — Net assets acquired $ 410,639 $ 43,723
Schedule of Purchased Credit-deteriorated Loans	As of August 15, 2020 As of February 14, 2020 Franklin Financial Network, Inc. FNB Financial Corp. Purchased credit-deteriorated loans Principal balance $ 693,999 $ 18,964 Allowance for credit losses at acquisition (24,831) (669) Net premium attributable to other factors 8,810 63 Loans purchased credit-deteriorated fair value $ 677,978 $ 18,358
Schedule of Pro Forma Financial Information (Unaudited)	Year Ended December 31, 2020 2019 2018 Net interest income $ 338,092 $ 348,660 $ 220,269 Total revenues $ 654,374 $ 504,273 $ 354,258 Net income $ 65,135 $ 99,898 $ 78,762
Franklin Financial Network, Inc.
Business Acquisition [Line Items]
Schedule of Consideration Paid and Allocation of Purchase Price to Net Assets Acquired	The following table presents an allocation of the consideration to net assets acquired: Purchase Price: Equity consideration Franklin shares outstanding (1) 15,588,337 Franklin options converted to net shares 62,906 15,651,243 Exchange ratio to FB Financial shares 0.965 FB Financial shares to be issued as merger consideration (2) 15,102,492 Issuance price as of August 15, 2020 $ 29.52 Value of FB Financial stock to be issued as merger consideration $ 445,826 Less: tax withholding on vested restricted stock awards, units and options (3) (1,308) Value of FB Financial stock issued $ 444,518 FB Financial shares issued 15,058,181 Franklin restricted stock units that do not vest on change in control 114,915 Replacement awards issued to Franklin employees 118,776 Fair value of replacement awards $ 3,506 Fair value of replacement awards attributable to pre-combination service $ 674 Cash consideration Total Franklin shares and net shares outstanding 15,651,243 Cash consideration per share $ 2.00 Total cash to be paid to Franklin (4) $ 31,330 Total purchase price $ 477,830 Fair value of net assets acquired 410,639 Goodwill resulting from merger $ 67,191 (1) Franklin shares outstanding includes restricted stock awards and restricted stock units that vested upon change in control. (2) Only factors in whole share issuance. Cash was paid in lieu of fractional shares. (3) Represents the equivalent value of approximately 44,311 shares of FB Financial Corporation stock on August 15, 2020.
FNB Financial Corp.
Business Acquisition [Line Items]
Schedule of Consideration Paid and Allocation of Purchase Price to Net Assets Acquired	The following table presents the total purchase price, fair value of net assets acquired, and the goodwill as of the acquisition date. Consideration: Net shares issued 954,797 Purchase price per share on February 14, 2020 $ 36.70 Value of stock consideration $ 35,041 Cash consideration paid 15,001 Total purchase price $ 50,042 Fair value of net assets acquired 43,723 Goodwill resulting from merger $ 6,319

Investment securities (Tables)

Investment securities (Tables)	12 Months Ended
	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Schedule of Amortized Cost of Securities and Fair Values	The following tables summarize the amortized cost, allowance for credit losses and fair value of the available-for-sale debt securities and the corresponding amounts of unrealized gains and losses recognized in accumulated other comprehensive income at December 31, 2020 and 2019: December 31, 2020 Amortized cost Gross unrealized gains Gross unrealized losses Allowance for credit losses for investments Fair Value Investment Securities Available-for-sale debt securities U.S. government agency securities $ 2,000 $ 3 $ — $ — $ 2,003 Mortgage-backed securities - residential 760,099 14,040 (803) — 773,336 Mortgage-backed securities - commercial 20,226 1,362 — — 21,588 States and political subdivisions 336,543 19,806 (20) — 356,329 U.S. Treasury securities 16,480 148 — — 16,628 Corporate securities 2,500 17 (1) — 2,516 Total $ 1,137,848 $ 35,376 $ (824) $ — $ 1,172,400 December 31, 2019 Amortized cost Gross unrealized gains Gross unrealized losses Fair Value Investment Securities Available-for-sale debt securities Mortgage-backed securities - residential $ 474,144 $ 4,829 $ (1,661) $ 477,312 Mortgage-backed securities - commercial 12,957 407 — 13,364 States and political subdivisions 181,178 8,287 (230) 189,235 U.S. Treasury securities 7,426 22 — 7,448 Corporate securities 1,000 22 — 1,022 Total $ 676,705 $ 13,567 $ (1,891) $ 688,381
Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary. December 31, December 31, 2020 2019 Available-for-sale Available-for-sale Amortized cost Fair value Amortized cost Fair value Due in one year or less $ 35,486 $ 35,662 $ 1,148 $ 1,152 Due in one to five years 24,278 24,684 11,553 11,676 Due in five to ten years 40,038 41,332 18,287 18,887 Due in over ten years 257,721 275,798 158,616 165,990 357,523 377,476 189,604 197,705 Mortgage-backed securities - residential 760,099 773,336 474,144 477,312 Mortgage-backed securities - commercial 20,226 21,588 12,957 13,364 Total debt securities $ 1,137,848 $ 1,172,400 $ 676,705 $ 688,381
Schedule of Sales and Other Dispositions of Available-for-Sale Securities	Sales and other dispositions of available-for-sale securities were as follows: Year Ended December 31, 2020 2019 2018 Proceeds from sales $ 146,494 $ 24,498 $ 2,742 Proceeds from maturities, prepayments and calls 220,549 113,018 73,066 Gross realized gains 1,606 7 9 Gross realized losses 271 98 44
Schedule of Gross Unrealized Losses	The following tables show gross unrealized losses for which an allowance for credit losses has not been recorded at December 31, 2020 and December 31, 2019, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position: December 31, 2020 Less than 12 months 12 months or more Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss U.S. government agency securities $ — $ — $ — $ — $ — $ — Mortgage-backed securities - residential 182,012 (803) — — 182,012 (803) States and political subdivisions 3,184 (20) — — 3,184 (20) Corporate securities 499 (1) — — 499 (1) Total $ 185,695 $ (824) $ — $ — $ 185,695 $ (824) December 31, 2019 Less than 12 months 12 months or more Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized loss Mortgage-backed securities - residential $ 47,641 $ (164) $ 175,730 $ (1,497) $ 223,371 $ (1,661) States and political subdivisions 15,433 (230) — — 15,433 (230) Total $ 63,074 $ (394) $ 175,730 $ (1,497) $ 238,804 $ (1,891)

Loans and allowance for credi_2

Loans and allowance for credit losses (Tables)	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Schedule of Loans Outstanding by Class of Financing Receivable	Loans outstanding at December 31, 2020 and 2019, by class of financing receivable are as follows: December 31, December 31, 2020 2019 Commercial and industrial (1) $ 1,346,122 $ 1,034,036 Construction 1,222,220 551,101 Residential real estate: 1-to-4 family mortgage 1,089,270 710,454 Residential line of credit 408,211 221,530 Multi-family mortgage 175,676 69,429 Commercial real estate: Owner occupied 924,841 630,270 Non-owner occupied 1,598,979 920,744 Consumer and other 317,640 272,078 Gross loans 7,082,959 4,409,642 Less: Allowance for credit losses (170,389) (31,139) Net loans $ 6,912,570 $ 4,378,503 (1) Includes $212,645 of loans originated as part of the PPP at December 31, 2020, established by the CARES Act, in response to the COVID-19 pandemic. The PPP is administered by the SBA; loans originated as part of the PPP may be forgiven by the SBA under a set of defined rules. PPP loans are federally guaranteed as part of the CARES Act, provided PPP loan recipients receive loan forgiveness under the SBA regulations. As such, there is minimal credit risk associated with these loans.
Schedule of Changes in Allowance for Credit Losses by Class of Financing Receivable	The following provides the changes in the allowance for credit losses by class of financing receivable for the years ended December 31, 2020, 2019, and 2018: Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Year Ended December 31, 2020 Beginning balance - December 31, 2019 $ 4,805 $ 10,194 $ 3,112 $ 752 $ 544 $ 4,109 $ 4,621 $ 3,002 $ 31,139 Impact of adopting ASC 326 on non-purchased credit deteriorated loans 5,300 1,533 7,920 3,461 340 1,879 6,822 3,633 30,888 Impact of adopting ASC 326 on purchased credit deteriorated loans 82 150 421 (3) — 162 184 (438) 558 Provision for credit losses 13,830 40,807 6,408 5,649 5,506 (1,739) 17,789 6,356 94,606 Recoveries of loans previously charged-off 1,712 205 122 125 — 83 — 756 3,003 Loans charged off (11,735) (18) (403) (22) — (304) (711) (2,112) (15,305) Initial allowance on loans purchased with deteriorated credit quality 754 5,606 1,640 572 784 659 15,442 43 25,500 Ending balance - December 31, 2020 $ 14,748 $ 58,477 $ 19,220 $ 10,534 $ 7,174 $ 4,849 $ 44,147 $ 11,240 $ 170,389 Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Year Ended December 31, 2019 Beginning balance - December 31, 2018 $ 5,348 $ 9,729 $ 3,428 $ 811 $ 566 $ 3,132 $ 4,149 $ 1,769 $ 28,932 Provision for loan losses 2,251 454 (175) 112 (22) 869 484 3,080 7,053 Recoveries of loans previously charged-off 136 11 79 138 — 108 — 634 1,106 Loans charged off (2,930) — (220) (309) — — (12) (2,481) (5,952) Ending balance - December 31, 2019 $ 4,805 $ 10,194 $ 3,112 $ 752 $ 544 $ 4,109 $ 4,621 $ 3,002 $ 31,139 Commercial and industrial Construction 1-to-4 family residential mortgage Residential line of credit Multi-family residential mortgage Commercial real estate owner occupied Commercial real estate non-owner occupied Consumer and Other Total Year Ended December 31, 2018 Beginning balance - $ 4,461 $ 7,135 $ 3,197 $ 944 $ 434 $ 3,558 $ 2,817 $ 1,495 $ 24,041 Provision for loan losses 1,395 1,459 547 (275) 132 (478) 1,281 1,337 5,398 Recoveries of loans 390 1,164 171 178 — 143 51 550 2,647 Loans charged off (898) (29) (138) (36) — (91) — (1,613) (2,805) Adjustments for transfers to loans HFS — — (349) — — — — — (349) Ending balance - $ 5,348 $ 9,729 $ 3,428 $ 811 $ 566 $ 3,132 $ 4,149 $ 1,769 $ 28,932
Schedule of Allowance for Credit Losses by Class of Financing Receivable Disaggregated by Measurement Methodology	The following tables provides the amount of the allowance for credit losses by class of financing receivable disaggregated by measurement methodology as of December 31, 2020, 2019 and 2018: December 31, 2020 Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Amount of allowance allocated to: Individually evaluated for credit loss $ 373 $ 95 $ — $ 9 $ — $ 30 $ 1,531 $ 1 $ 2,039 Collectively evaluated for credit loss 13,493 54,065 17,206 10,031 6,326 4,062 33,706 10,516 149,405 Purchased credit deteriorated 882 4,317 2,014 494 848 757 8,910 723 18,945 Ending balance - December 31, 2020 $ 14,748 $ 58,477 $ 19,220 $ 10,534 $ 7,174 $ 4,849 $ 44,147 $ 11,240 $ 170,389 December 31, 2019 Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Amount of allowance allocated to: Individually evaluated for impairment $ 241 $ — $ 8 $ 9 $ — $ 238 $ 399 $ — $ 895 Collectively evaluated for impairment 4,457 10,192 2,940 743 544 3,853 3,909 1,933 28,571 Acquired with deteriorated credit quality 107 2 164 — — 18 313 1,069 1,673 Ending balance - December 31, 2019 $ 4,805 $ 10,194 $ 3,112 $ 752 $ 544 $ 4,109 $ 4,621 $ 3,002 $ 31,139 December 31, 2018 Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Amount of allowance allocated to: Individually evaluated for impairment $ 3 $ — $ 7 $ — $ — $ 53 $ 205 $ — $ 268 Collectively evaluated for impairment 5,247 9,677 3,205 811 566 3,066 3,628 1,583 27,783 Acquired with deteriorated credit quality 98 52 216 — — 13 316 186 881 Ending balance - December 31, 2018 $ 5,348 $ 9,729 $ 3,428 $ 811 $ 566 $ 3,132 $ 4,149 $ 1,769 $ 28,932
Schedule of Amount of Loans by Class of Financing Receivable Disaggregated by Measurement Methodology	The following table provides the amount of loans by class of financing receivable disaggregated by measurement methodology as of December 31, 2020, 2019, and 2018: December 31, 2020 Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Loans, net of unearned income Individually evaluated for credit loss $ 15,578 $ 4,851 $ 848 $ 412 $ — $ 7,846 $ 8,631 $ 39 $ 38,205 Collectively evaluated for credit loss 1,270,058 1,140,634 987,142 387,250 156,447 813,151 1,272,203 302,983 6,329,868 Purchased credit deteriorated 60,486 76,735 101,280 20,549 19,229 103,844 318,145 14,618 714,886 Ending balance - December 31, 2020 $ 1,346,122 $ 1,222,220 $ 1,089,270 $ 408,211 $ 175,676 $ 924,841 $ 1,598,979 $ 317,640 $ 7,082,959 December 31, 2019 Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Loans, net of unearned income Individually evaluated for impairment $ 9,026 $ 2,061 $ 1,347 $ 579 $ — $ 2,993 $ 7,755 $ 49 $ 23,810 Collectively evaluated for impairment 1,023,326 546,156 689,769 220,878 69,429 621,386 902,792 254,944 4,328,680 Acquired with deteriorated credit quality 1,684 2,884 19,338 73 — 5,891 10,197 17,085 57,152 Ending balance - December 31, 2019 $ 1,034,036 $ 551,101 $ 710,454 $ 221,530 $ 69,429 $ 630,270 $ 920,744 $ 272,078 $ 4,409,642 December 31, 2018 Commercial Construction 1-to-4 Residential Multi-family Commercial Commercial Consumer Total Loans, net of unearned income Individually evaluated for impairment $ 1,847 $ 1,221 $ 987 $ 245 $ — $ 2,608 $ 6,735 $ 73 $ 13,716 Collectively evaluated for impairment 863,788 549,075 535,451 190,235 75,457 484,900 677,247 208,643 3,584,796 Acquired with deteriorated credit quality 1,448 5,755 19,377 — — 6,016 16,266 20,137 68,999 Ending balance - December 31, 2018 $ 867,083 $ 556,051 $ 555,815 $ 190,480 $ 75,457 $ 493,524 $ 700,248 $ 228,853 $ 3,667,511
Schedule of Credit Quality of Loan Portfolio by Year of Origination	The following table presents the credit quality of our loan portfolio by year of origination as of December 31, 2020. Revolving loans are presented separately. Management considers the guidance in ASC 310-20 when determining whether a modification, extension, or renewal constitutes a current period origination. Generally, current period renewals of credit are reunderwritten at the point of renewal and considered current period originations for the purposes of the table below. As of December 31, Term Loans Amortized Cost Basis by Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Commercial and industrial Pass $ 335,519 $ 183,905 $ 64,897 $ 56,598 $ 30,641 $ 40,964 $ 525,885 $ 1,238,409 Watch 3,786 2,555 6,213 3,764 7,847 4,301 39,901 68,367 Substandard 2,467 2,688 11,227 4,403 6,582 1,277 10,502 39,146 Doubtful 34 — — 22 — — 144 200 Total 341,806 189,148 82,337 64,787 45,070 46,542 576,432 1,346,122 Construction Pass 460,232 387,759 78,319 40,777 40,386 59,344 112,004 1,178,821 Watch 1,952 4,169 10,368 13,386 1,250 3,559 — 34,684 Substandard 573 1,755 3,178 129 — 3,068 — 8,703 Doubtful — — — 12 — — — 12 Total 462,757 393,683 91,865 54,304 41,636 65,971 112,004 1,222,220 Residential real estate: 1-to-4 family mortgage Pass 282,747 176,374 159,036 147,816 107,911 152,027 — 1,025,911 Watch 1,783 2,166 6,672 10,668 4,004 13,889 — 39,182 Substandard 448 1,422 3,787 5,473 3,418 9,043 — 23,591 Doubtful — 6 19 — 204 357 — 586 Total 284,978 179,968 169,514 163,957 115,537 175,316 — 1,089,270 Residential line of credit Pass — — — — — — 396,348 396,348 Watch — — — — — — 6,511 6,511 Substandard — — — — — — 4,756 4,756 Doubtful — — — — — — 596 596 Total — — — — — — 408,211 408,211 Multi-family mortgage Pass 29,006 13,446 11,843 46,561 28,330 35,339 11,094 175,619 Watch — — — — — — — — Substandard — — — — — 57.00 — 57 Doubtful — — — — — — — — Total 29,006 13,446 11,843 46,561 28,330 35,396 11,094 175,676 2020 2019 2018 2017 2016 Prior Revolving Loans Amortized Cost Basis Total Commercial real estate: Owner occupied Pass 133,046 174,965 95,182 89,214 76,539 208,013 51,264 828,223 Watch 8,825 5,891 6,646 21,618 6,101 18,561 2,417 70,059 Substandard 44 1,785 2,423 6,074 274 11,226 4,733 26,559 Doubtful — — — — — — — — Total 141,915 182,641 104,251 116,906 82,914 237,800 58,414 924,841 Non-owner occupied Pass 166,962 222,238 324,848 193,496 264,820 237,933 37,787 1,448,084 Watch — 8,704 24,464 27,653 25,550 42,696 1,033 130,100 Substandard — 2,210 1,502 — — 17,083 — 20,795 Doubtful — — — — — — — — Total 166,962 233,152 350,814 221,149 290,370 297,712 38,820 1,598,979 Consumer and other loans Pass 89,625 52,725 39,420 26,172 40,980 31,063 14,816 294,801 Watch 281 911 1,893 1,497 3,049 7,974 12 15,617 Substandard 96 131 867 881 779 2,044 668 5,466 Doubtful 55 434 567 280 156 264 — 1,756 Total 90,057 54,201 42,747 28,830 44,964 41,345 15,496 317,640 Total Pass 1,497,137 1,211,412 773,545 600,634 589,607 764,683 1,149,198 6,586,216 Watch 16,627 24,396 56,256 78,586 47,801 90,980 49,874 364,520 Substandard 3,628 9,991 22,984 16,960 11,053 43,798 20,659 129,073 Doubtful 89 440 586 314 360 621 740 3,150 Total $ 1,517,481 $ 1,246,239 $ 853,371 $ 696,494 $ 648,821 $ 900,082 $ 1,220,471 $ 7,082,959
Schedule of Credit Quality Indicators by Class of Financing Receivable	The following table shows credit quality indicators by class of financing receivable at December 31, 2019. December 31, 2019 Pass Watch Substandard Total Loans, excluding purchased credit impaired loans Commercial and industrial $ 946,247 $ 66,910 $ 19,195 $ 1,032,352 Construction 541,201 4,790 2,226 548,217 Residential real estate: 1-to-4 family mortgage 666,177 11,380 13,559 691,116 Residential line of credit 218,086 1,343 2,028 221,457 Multi-family mortgage 69,366 63 — 69,429 Commercial real estate: Owner occupied 576,737 30,379 17,263 624,379 Non-owner occupied 876,670 24,342 9,535 910,547 Consumer and other 248,632 3,304 3,057 254,993 Total loans, excluding purchased credit impaired loans $ 4,143,116 $ 142,511 $ 66,863 $ 4,352,490 Purchased credit impaired loans Commercial and industrial $ — $ 1,224 $ 460 $ 1,684 Construction — 2,681 203 2,884 Residential real estate: 1-to-4 family mortgage — 15,091 4,247 19,338 Residential line of credit — — 73 73 Multi-family mortgage — — — — Commercial real estate: Owner occupied — 4,535 1,356 5,891 Non-owner occupied — 6,617 3,580 10,197 Consumer and other — 13,521 3,564 17,085 Total purchased credit impaired loans — 43,669 13,483 57,152 Total loans $ 4,143,116 $ 186,180 $ 80,346 $ 4,409,642
Schedule of Analysis of Aging by Class of Financing Receivable	The following table represents an analysis of the aging by class of financing receivable as of December 31, 2020: December 31, 2020 30-89 days 90 days or Non-accrual Loans current Total Commercial and industrial $ 3,297 $ 330 $ 16,005 $ 1,326,490 $ 1,346,122 Construction 7,607 573 4,053 1,209,987 1,222,220 Residential real estate: 1-to-4 family mortgage 7,058 10,470 5,923 1,065,819 1,089,270 Residential line of credit 3,551 239 1,757 402,664 408,211 Multi-family mortgage — 57 — 175,619 175,676 Commercial real estate: Owner occupied 98 — 7,948 916,795 924,841 Non-owner occupied 915 — 12,471 1,585,593 1,598,979 Consumer and other 4,469 2,027 2,603 308,541 317,640 Total $ 26,995 $ 13,696 $ 50,760 $ 6,991,508 $ 7,082,959 The following table provides the period-end amounts of loans that are past due, loans not accruing interest and loans current on payments accruing interest by category at December 31, 2019: December 31, 2019 30-89 days 90 days or Non-accrual Purchased Credit Loans current on payments and accruing interest Total Commercial and industrial $ 1,918 $ 291 $ 5,587 $ 1,684 $ 1,024,556 $ 1,034,036 Construction 1,021 42 1,087 2,884 546,067 551,101 Residential real estate: 1-to-4 family mortgage 10,738 3,965 3,332 19,338 673,081 710,454 Residential line of credit 658 412 416 73 219,971 221,530 Multi-family mortgage 63 — — — 69,366 69,429 Commercial real estate: Owner occupied 1,375 — 1,793 5,891 621,211 630,270 Non-owner occupied 327 — 7,880 10,197 902,340 920,744 Consumer and other 2,377 833 967 17,085 250,816 272,078 Total $ 18,477 $ 5,543 $ 21,062 $ 57,152 $ 4,307,408 $ 4,409,642
Schedule of Amortized Cost, Related Allowance and Interest Income of Non-accrual Loans	The following tables provide the amortized cost basis of loans on non-accrual status, as well as any related allowance and interest income, by class of financing receivable as of or for the year ended December 31, 2020: u End of period amortized cost Beginning of Non-accrual Non-accrual Related Year to date Interest Income Commercial and industrial $ 5,586 $ 13,960 $ 2,045 $ 383 $ 325 Construction 1,254 3,061 992 131 69 Residential real estate: 1-to-4 family mortgage 4,585 3,048 2,875 84 22 Residential line of credit 489 854 903 31 72 Commercial real estate: Owner occupied 2,285 7,172 776 63 89 Non-owner occupied 9,460 4,566 7,905 1,711 215 Consumer and other 1,623 — 2,603 147 24 Total $ 25,282 $ 32,661 $ 18,099 $ 2,550 $ 816
Schedule of Impaired Loans Segregated by Class	Impaired loans recognized in conformity with ASC 310 at December 31, 2019 segregated by class, were as follows: December 31, 2019 Recorded Unpaid Related With a related allowance recorded: Commercial and industrial $ 6,080 $ 8,350 $ 241 Residential real estate: 1-to-4 family mortgage 264 324 8 Residential line of credit 320 320 9 Commercial real estate: Owner occupied 756 1,140 238 Non-owner occupied 6,706 6,747 399 Total $ 14,126 $ 16,881 $ 895 With no related allowance recorded: Commercial and industrial $ 2,946 $ 3,074 $ — Construction 2,061 2,499 — Residential real estate: 1-to-4 family mortgage 1,083 1,449 — Residential line of credit 259 280 — Commercial real estate: Owner occupied 2,237 2,627 — Non-owner occupied 1,049 1,781 — Consumer and other 49 49 — Total $ 9,684 $ 11,759 $ — Total impaired loans $ 23,810 $ 28,640 $ 895 Average recorded investment and interest income on a cash basis recognized during the years ended December 31, 2019, and 2018 on impaired loans, segregated by class, were as follows: December 31, 2019 2018 Average recorded investment Interest income recognized (cash basis) Average recorded investment Interest income recognized (cash basis) With a related allowance recorded: Commercial and industrial $ 3,349 $ 474 $ 335 $ 121 Residential real estate: 1-to-4 family mortgage 205 13 170 9 Commercial real estate: Owner occupied 658 27 702 43 Non-owner occupied 6,196 109 2,915 2 Consumer and other — — — — Total $ 10,568 $ 624 $ 4,122 $ 175 With no related allowance recorded: Commercial and industrial $ 2,088 $ 201 $ 1,377 $ 70 Construction 1,641 167 1,255 74 Residential real estate: 1-to-4 family mortgage 963 68 955 74 Residential line of credit 252 1 123 15 Commercial real estate: Owner occupied 2,143 133 1,862 148 Non-owner occupied 1,049 — 1,313 7 Consumer and other 61 5 49 4 Total $ 8,197 $ 575 $ 7,423 $ 418 Total impaired loans $ 18,765 $ 1,199 $ 11,545 $ 593
Schedule of Changes Value of Accretable Yield of PCI Loans	The following table presents changes in the value of the accretable yield for PCI loans for the periods indicated. Year Ended December 31, 2019 2018 Balance at the beginning of period $ (16,587) $ (17,682) Additions through business combinations (1,167) — Principal reductions and other reclassifications from nonaccretable difference 61 (4,047) Accretion 7,003 9,010 Changes in expected cash flows (360) (3,868) Balance at end of period $ (11,050) $ (16,587)
Schedule of Financial Effect of TDRs	The following tables present the financial effect of TDRs recorded during the periods indicated. Year Ended December 31, 2020 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial and industrial 5 $ 2,257 $ 2,257 $ — Commercial real estate: Owner occupied 7 2,794 2,794 — Non-owner occupied 2 3,752 3,752 $ — Residential real estate: 1-to-4 family mortgage 3 618 618 — Residential line of credit 1 95 95 — Total 18 $ 9,516 $ 9,516 $ — Year Ended December 31, 2019 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial and industrial 3 $ 3,204 $ 3,204 $ — Construction 2 1,085 1,085 — Commercial real estate: Owner occupied 2 1,494 1,495 — Non-owner occupied 1 1,366 1,366 106 Residential real estate: 1-4 family mortgage 2 175 175 — Residential line of credit 2 333 333 9 Total 12 $ 7,657 $ 7,658 $ 115 Year Ended December 31, 2018 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial and industrial 2 $ 887 $ 887 $ — Commercial real estate: Owner occupied 1 143 143 — Residential real estate: 1-4 family mortgage 1 249 249 — Consumer and other 5 61 61 — Total 9 $ 1,340 $ 1,340 $ —
Schedule of Individually Assessed Allowance for Credit Losses for Collateral Dependent Loans	For loans for which the repayment (based on the Company's assessment) is expected to be provided substantially through the operation or sale of collateral and the borrower is experiencing financial difficulty, the following table presents the loans and the corresponding individually assessed allowance for credit losses by class of financing receivable. December 31, 2020 Type of Collateral Real Estate Financial Assets and Equipment Individually assessed allowance for credit loss Commercial and industrial $ — $ 1,728 $ 117 Construction 3,877 — — Residential real estate: 1-to-4 family mortgage 226 — — Residential line of credit 1,174 — 9 Multi-family mortgage — — — Commercial real estate: Owner occupied 3,391 — 30 Non-owner occupied 8,164 — 1,531 Consumer and other — — — Total $ 16,832 $ 1,728 $ 1,687
Schedule of Financing Receivables Under Deferral Program	The following table outlines the Company's recorded investment and percentage of loans held for investment by class of financing receivable for Company executed deferrals that remain on deferral at December 31, 2020, in connection with Company COVID-19 relief programs. These deferrals typically ranged from sixty December 31, 2020 % of Loans Commercial and industrial $ 7,118 0.5 % Construction 1,918 0.2 % Residential real estate: 1-to-4 family mortgage 19,201 1.8 % Residential line of credit 204 — % Multi-family mortgage 3,305 1.9 % Commercial real estate: Owner occupied 19,815 2.1 % Non-owner occupied 139,590 8.7 % Consumer and other 11,366 3.6 % Total $ 202,517 2.9 %

Loans held for sale (Tables)

Loans held for sale (Tables)	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Schedule for Loans Held For Sale	The following table summarizes loans held for sale, at fair value, as of the periods presented: December 31, December 31, 2020 2019 Commercial and industrial $ 215,403 $ — Residential real estate: 1-4 family mortgage 683,770 262,518 Total loans held for sale, at fair value $ 899,173 $ 262,518

Premises and equipment (Tables)

Premises and equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Schedule of Premises and Equipment and Related Accumulated Depreciation	Premises and equipment and related accumulated depreciation as of December 31, 2020 and 2019, are as follows: 2020 2019 Land $ 33,151 $ 26,283 Premises 108,579 65,569 Furniture and fixtures 26,729 23,545 Leasehold improvements 18,429 12,989 Equipment 16,904 15,575 Construction in process 1,501 800 Finance lease 1,588 — 206,881 144,761 Less: accumulated depreciation and amortization (61,766) (54,630) Total Premises and Equipment $ 145,115 $ 90,131

Other real estate owned (Tables

Other real estate owned (Tables)	12 Months Ended
	Dec. 31, 2020
Real Estate [Abstract]
Schedule of Other Real Estate Owned	The following table summarizes the other real estate owned for the year ended December 31, 2020, 2019, and 2018: Year Ended December 31, 2020 2019 2018 Balance at beginning of period $ 18,939 $ 12,643 $ 16,442 Transfers from loans 2,746 5,487 2,138 Transfers (to) from premises and equipment (841) 4,290 — Proceeds from sale of other real estate owned (6,937) (3,860) (4,819) Gain on sale of other real estate owned 354 1,058 271 Loans provided for sales of other real estate owned (305) (166) (1,019) Write-downs and partial liquidations (1,845) (513) (370) Balance at end of period $ 12,111 $ 18,939 $ 12,643

Goodwill and intangible assets

Goodwill and intangible assets (Tables)	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill Activity	Goodwill Balance at December 31, 2018 $ 137,190 Addition from acquisition of Atlantic Capital branches 31,961 Relief of goodwill due to sale of TPO mortgage delivery channel (100) Balance at December 31, 2019 $ 169,051 Balance at December 31, 2019 $ 169,051 Addition from acquisition of Farmers National 6,319 Addition from acquisition of Franklin 67,191 Balance at December 31, 2020 $ 242,561
Schedule of Core Deposit and Other Intangibles	The composition of core deposit and other intangibles as of December 31, 2020 and December 31, 2019 is as follows: Core deposit and other intangibles Gross Carrying Amount Accumulated Amortization Net Carrying Amount December 31, 2020 Core deposit intangible $ 59,835 $ (38,807) $ 21,028 Customer base trust intangible 1,600 (547) 1,053 Manufactured housing servicing intangible 1,088 (743) 345 Total core deposit and other intangibles $ 62,523 $ (40,097) $ 22,426 December 31, 2019 Core deposit intangible $ 49,675 $ (33,861) $ 15,814 Customer base trust intangible 1,600 (387) 1,213 Manufactured housing servicing intangible 1,088 (526) 562 Total core deposit and other intangibles $ 52,363 $ (34,774) $ 17,589
Schedule of Estimated Aggregate Amortization Expense of Core Deposit and Other Intangibles	The estimated aggregate future amortization expense of core deposit and other intangibles is as follows: 2021 $ 5,477 2022 4,586 2023 3,658 2024 2,946 2025 2,306 Thereafter 3,453 $ 22,426

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Schedule of Information Related to Company's Leases and Lease Expense	Information related to the Company's leases is presented below: December 31, Classification 2020 2019 Right-of-use assets: Operating leases Operating lease right-of-use assets $ 49,537 $ 32,539 Finance leases Premises and equipment, net 1,588 — Total right-of-use assets $ 51,125 $ 32,539 Lease liabilities: Operating leases Operating lease liabilities $ 55,187 $ 35,525 Finance leases Borrowings 1,598 — Total lease liabilities $ 56,785 $ 35,525 Weighted average remaining lease term (in years) - operating 12.2 14.1 Weighted average remaining lease term (in years) - finance 14.4 0.0 Weighted average discount rate - operating 2.65 % 3.44 % Weighted average discount rate - finance 1.76 % — % The components of total lease expense included in the consolidated statements of income were as follows: Year Ended December 31, Classification 2020 2019 Operating lease costs Amortization of right-of-use asset Occupancy and equipment $ 6,228 $ 5,057 Short-term lease cost Occupancy and equipment 456 365 Variable lease cost Occupancy and equipment 602 682 Finance lease costs Interest on lease liabilities Interest expense on borrowings 11 — Amortization of right-of-use asset Occupancy and equipment 43 — Lease impairment Merger costs 2,142 — Total lease cost $ 9,482 $ 6,104
Schedule of Maturity Analysis of Operating Lease Liabilities	A maturity analysis of operating and finance lease liabilities and a reconciliation of undiscounted cash flows to the total lease liability as of December 31, 2020 is as follows: Operating Finance Leases Leases Lease payments due: December 31, 2021 $ 8,042 $ 115 December 31, 2022 7,693 116 December 31, 2023 6,302 118 December 31, 2024 5,625 120 December 31, 2025 4,972 121 Thereafter 34,053 1,225 Total undiscounted future minimum lease payments 66,687 1,815 Less: imputed interest (11,500) (217) Net lease liability $ 55,187 $ 1,598
Schedule of Maturity of Finance Lease Liabilities	A maturity analysis of operating and finance lease liabilities and a reconciliation of undiscounted cash flows to the total lease liability as of December 31, 2020 is as follows: Operating Finance Leases Leases Lease payments due: December 31, 2021 $ 8,042 $ 115 December 31, 2022 7,693 116 December 31, 2023 6,302 118 December 31, 2024 5,625 120 December 31, 2025 4,972 121 Thereafter 34,053 1,225 Total undiscounted future minimum lease payments 66,687 1,815 Less: imputed interest (11,500) (217) Net lease liability $ 55,187 $ 1,598

Mortgage servicing rights (Tabl

Mortgage servicing rights (Tables)	12 Months Ended
	Dec. 31, 2020
Transfers and Servicing of Financial Assets [Abstract]
Schedule of Changes in Mortgage Servicing Rights	Changes in the Company’s mortgage servicing rights were as follows for the years ended December 31, 2020, 2019, and 2018: Year Ended December 31, 2020 2019 2018 Carrying value at beginning of period $ 75,521 $ 88,829 76,107 Capitalization 47,025 42,151 54,913 Mortgage servicing rights acquired from Franklin, at fair value 5,111 — Sales — (29,160) (39,428) Change in fair value: Due to pay-offs/pay-downs (27,834) (16,350) (11,062) Due to change in valuation inputs or assumptions (19,826) (9,949) 8,299 Carrying value at end of period $ 79,997 $ 75,521 $ 88,829
Schedule of Servicing Income and Expense Included in Mortgage Banking Income	The following table summarizes servicing income and expense, which are included in 'Mortgage banking income' and 'Other noninterest expense', respectively, within the Mortgage segment operating results for the years ended December 31, 2020, 2019, and 2018: Year Ended December 31, 2020 2019 2018 Servicing income: Servicing income $ 22,128 $ 17,677 $ 20,591 Change in fair value of mortgage servicing rights (47,660) (26,299) (2,763) Change in fair value of derivative hedging instruments 13,286 9,310 (5,910) Servicing income (12,246) 688 11,918 Servicing expenses 7,890 6,832 7,675 Net servicing (loss) income (1) $ (20,136) $ (6,144) $ 4,243 (1) Excludes benefit of custodial service related noninterest-bearing deposits held by the Bank.
Schedule of Data and Key Economic Assumptions Related to Mortgage Servicing Rights	Data and key economic assumptions related to the Company’s mortgage servicing rights as of December 31, 2020 and 2019 are as follows: December 31, 2020 2019 Unpaid principal balance $ 9,787,657 $ 6,734,496 Weighted-average prepayment speed (CPR) 14.07 % 10.05 % Estimated impact on fair value of a 10% increase $ (4,493) $ (2,839) Estimated impact on fair value of a 20% increase $ (8,599) $ (5,474) Discount rate 11.49 % 9.68 % Estimated impact on fair value of a 100 bp increase $ (2,942) $ (3,086) Estimated impact on fair value of a 200 bp increase $ (5,674) $ (5,932) Weighted-average coupon interest rate 3.58 % 4.20 % Weighted-average servicing fee (basis points) 28 29 Weighted-average remaining maturity (in months) 328 335

Other assets and other liabil_2

Other assets and other liabilities (Tables)	12 Months Ended
	Dec. 31, 2020
Other Assets And Other Liabilities [Abstract]
Schedule of Other Assets	Included in other assets are: As of December 31, Other assets 2020 2019 Cash surrender value on bank owned life insurance $ 71,977 $ 11,357 Prepaid expenses 5,328 4,575 Software 1,147 1,999 Mortgage lending receivable 8,716 10,765 Derivatives (See Note 18) 68,938 21,981 Deferred tax asset (See Note 15) 16,396 — FHLB lender risk account receivable (See Note 1) 12,729 11,225 Pledged collateral on derivative instruments 57,985 33,616 Other assets 30,900 27,196 Total other assets $ 274,116 $ 122,714
Schedule of Other Liabilities	Included in other liabilities are: As of December 31, Other liabilities 2020 2019 Deferred compensation $ 2,261 $ 1,718 Accrued payroll 35,827 16,517 Mortgage buyback reserve 5,928 3,529 Accrued interest 6,772 6,465 Derivatives (See Note 18) 48,242 17,933 Deferred tax liability (See Note 15) — 20,490 FHLB lender risk account guaranty 6,183 5,546 Reserve for unfunded commitments 16,378 — Other liabilities 42,809 15,256 Total other liabilities $ 164,400 $ 87,454

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2020
Deposits [Abstract]
Schedule of Maturities of Time Deposits	At December 31, 2020, the scheduled maturities of time deposits are as follows: Scheduled maturities of time deposits Due on or before: December 31, 2021 $ 1,048,816 December 31, 2022 204,165 December 31, 2023 117,178 December 31, 2024 44,718 December 31, 2025 22,325 Thereafter 52 Total $ 1,437,254

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Borrowings include securities sold under agreements to repurchase, lines of credit, Federal Home Loan Bank advances, and subordinated debt. Outstanding Balance Weighted Average Interest Rate December 31, December 31, December 31, December 31, 2020 2019 2020 2019 Securities sold under agreements to repurchase $ 32,199 $ 23,745 0.47 % 0.89 % FHLB advances — 250,000 — % 1.60 % Subordinated debt 189,527 30,930 5.10 % 5.13 % Other borrowings 16,598 — 1.88 % — % $ 238,324 $ 304,675
Schedule of Securities Sold under Agreement to Repurchase	Information concerning securities sold under agreement to repurchase is summarized as follows: December 31, 2020 December 31, 2019 Balance at year end $ 32,199 $ 23,745 Average daily balance during the year 32,912 22,798 Average interest rate during the year 0.61 % 0.84 % Maximum month-end balance during the year $ 40,282 $ 30,273 Weighted average interest rate at year-end 0.47 % 0.89 %

Income taxes (Tables)

Income taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of Allocation of Federal and State Income Taxes between Current and Deferred Portions	An allocation of federal and state income taxes between current and deferred portions is presented below: For the Year Ended December 31, 2020 2019 2,018 Current $ 44,362 $ 27,641 $ 19,259 Deferred (25,530) (1,916) 6,359 Total $ 18,832 $ 25,725 $ 25,618
Schedule of Reconciliation of Income Taxes Computed at the United States Federal Statutory Tax Rates to the Provision for Income Taxes	The following table presents a reconciliation of federal income taxes at the statutory federal rate of 21% to the Company's effective tax rates for the year ended December 31, 2020, 2019, and 2018: For the Year Ended December 31, 2020 2019 2018 Federal taxes calculated at statutory rate $ 17,317 21.0 % $ 23,003 21.0 % $ 22,230 21.0 % Increase (decrease) resulting from: State taxes, net of federal benefit 3,197 3.9 % 4,792 4.4 % 4,666 4.4 % Expense (benefit) from equity based compensation 153 0.2 % (1,353) (1.2) % (870) (0.8) % Municipal interest income, net of interest disallowance (1,507) (1.8) % (908) (0.8) % (837) (0.8) % Bank owned life insurance (327) (0.4) % (51) (0.1) % (51) — % Merger costs 289 0.4 % 66 0.1 % 141 0.1 % Other (290) (0.4) % 176 0.1 % 339 0.3 % Income tax expense, as reported $ 18,832 22.9 % $ 25,725 23.5 % $ 25,618 24.2 %
Schedule of Net Deferred Tax liability	The components of the net deferred tax assets (liabilities) at December 31, 2020 and December 31, 2019, are as follows: December 31, December 31 2020 2019 Deferred tax assets: Allowance for credit losses $ 48,409 $ 8,113 Operating lease liabilities 14,496 9,373 Federal net operating loss 1,753 — Amortization of core deposit intangibles — 1,386 Deferred compensation 8,872 5,231 Unrealized loss on debt securities — 54 Unrealized loss on equity securities — 60 Unrealized loss on cash flow hedges 499 — Other 19,101 2,388 Subtotal 93,130 26,605 Deferred tax liabilities: FHLB stock dividends $ (561) $ (550) Operating leases - right of use assets (13,197) (8,641) Depreciation (7,491) (5,078) Amortization of core deposit intangibles (684) — Unrealized gain on equity securities (17) — Unrealized gain on cash flow hedges — (203) Unrealized gain on debt securities (13,027) (3,051) Mortgage servicing rights (20,803) (19,678) Goodwill (11,301) (8,859) Other (9,653) (1,035) Subtotal (76,734) (47,095) Net deferred tax assets (liabilities) $ 16,396 $ (20,490)

Commitments and contingencies (

Commitments and contingencies (Tables)	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Financial Instruments with Off-Balance Sheet Credit Risk	December 31, 2020 2019 Commitments to extend credit, excluding interest rate lock commitments $ 2,719,996 $ 1,086,173 Letters of credit 67,598 19,569 Balance at end of period $ 2,787,594 $ 1,105,742
Schedule of Allowance of Credit Losses on Unfunded Commitments	The table below presents activity within the allowance for credit losses on unfunded commitments: For the Year Ended December 31, 2020 Balance at beginning of period $ — Impact of CECL adoption on provision for credit losses on unfunded commitments 2,947 Increase in provision for credit losses from unfunded commitments acquired in business combination 10,499 Provision for credit losses on unfunded commitments 2,932 Balance at end of period $ 16,378
Schedule of Activity in the Repurchase Reserve	The following table summarizes the activity in the repurchase reserve: For the Year Ended December 31, 2020 2019 2018 Balance at beginning of period $ 3,529 $ 3,273 $ 3,386 Provision for loan repurchases or indemnifications 2,607 362 174 Recoveries on previous losses (208) (106) 3 Losses on loans repurchased or indemnified — — (290) Balance at end of period $ 5,928 $ 3,529 $ 3,273

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Financial Instruments	The following tables provide details on the Company’s derivative financial instruments as of the dates presented: December 31, 2020 Notional Amount Asset Liability Not designated as hedging: Interest rate contracts $ 606,878 $ 34,547 $ 34,317 Forward commitments 1,358,328 — 11,633 Interest rate-lock commitments 1,191,621 34,391 — Futures contracts 375,400 — 383 Total $ 3,532,227 $ 68,938 $ 46,333 December 31, 2019 Notional Amount Asset Liability Not designated as hedging: Interest rate contracts $ 440,556 $ 14,929 $ 14,929 Forward commitments 684,437 — 866 Interest rate-lock commitments 453,198 7,052 — Futures contracts 389,000 — 1,623 Total $ 1,967,191 $ 21,981 $ 17,418 December 31, 2020 Notional Amount Asset Liability Designated as hedging: Interest rate swaps $ 30,000 $ — $ 1,909 December 31, 2019 Notional Amount Asset Liability Designated as hedging: Interest rate swaps $ 30,000 $ — $ 515
Schedule of Gains (Losses) Included in the Consolidated Statements of Income Related to Derivative Financial Instruments	Gains (losses) included in the consolidated statements of income related to the Company’s derivative financial instruments were as follows: Year Ended December 31, 2020 2019 2018 Not designated as hedging instruments (included in mortgage banking income): Interest rate lock commitments $ 27,339 $ (2,112) $ (527) Forward commitments (73,033) 12,170 3,864 Futures contracts 8,151 (6,723) (2,981) Option contracts — (47) (58) Total $ (37,543) $ 3,288 $ 298 Year Ended December 31, 2020 2019 2018 Designated as hedging: Amount of gain reclassified from other comprehensive income and recognized in interest expense on borrowings, net of taxes of $337, $170, and $45 $ 955 $ 481 $ 128 (Loss) gain included in interest expense on borrowings (353) 115 32 Total $ 602 $ 596 $ 160 The following discloses the amount included in other comprehensive income, net of tax, for derivative instruments designated as cash flow hedges for the periods presented: Year Ended December 31, 2020 2019 2018 Designated as hedging: Amount of (loss) gain recognized in other comprehensive income, net of tax $363, $322, and $366 $ (1,031) $ (914) $ 1,039
Schedule of Offsetting Assets	The following table presents the Company's gross derivative positions as recognized in the consolidated balance sheets as well as the net derivative positions, including collateral pledged to the extent the application of such collateral did not reduce the net derivative liability position below zero, had the Company elected to offset those instruments subject to an enforceable master netting agreement: Offsetting Derivative Assets Offsetting Derivative Liabilities December 31, 2020 December 31, 2019 December 31, 2020 December 31, 2019 Gross amounts recognized $ 3,863 $ 331 $ 34,051 $ 14,682 Gross amounts offset in the consolidated balance sheets — — — — Net amounts presented in the consolidated balance sheets 3,863 331 34,051 14,682 Gross amounts not offset in the consolidated balance sheets Less: financial instruments 857 139 857 139 Less: financial collateral pledged — — 33,194 14,543 Net amounts $ 3,006 $ 192 $ — $ —
Schedule of Offsetting Liabilities	The following table presents the Company's gross derivative positions as recognized in the consolidated balance sheets as well as the net derivative positions, including collateral pledged to the extent the application of such collateral did not reduce the net derivative liability position below zero, had the Company elected to offset those instruments subject to an enforceable master netting agreement: Offsetting Derivative Assets Offsetting Derivative Liabilities December 31, 2020 December 31, 2019 December 31, 2020 December 31, 2019 Gross amounts recognized $ 3,863 $ 331 $ 34,051 $ 14,682 Gross amounts offset in the consolidated balance sheets — — — — Net amounts presented in the consolidated balance sheets 3,863 331 34,051 14,682 Gross amounts not offset in the consolidated balance sheets Less: financial instruments 857 139 857 139 Less: financial collateral pledged — — 33,194 14,543 Net amounts $ 3,006 $ 192 $ — $ —

Fair value of financial instr_2

Fair value of financial instruments (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Schedule of Estimated Fair Values and Carrying Values of Financial Instruments	The following table contains the estimated fair values and the related carrying values of the Company's financial instruments. Items which are not financial instruments are not included. Fair Value December 31, 2020 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 1,317,898 $ 1,317,898 $ — $ — $ 1,317,898 Investment securities 1,176,991 — 1,176,991 — 1,176,991 Loans, net 6,912,570 — — 7,058,693 7,058,693 Loans held for sale 899,173 — 683,770 215,403 899,173 Interest receivable 43,603 33 5,254 38,316 43,603 Mortgage servicing rights 79,997 — — 79,997 79,997 Derivatives 68,938 — 68,938 — 68,938 Financial liabilities: Deposits: Without stated maturities $ 8,020,783 $ 8,020,783 $ — $ — $ 8,020,783 With stated maturities 1,437,254 — 1,446,605 — 1,446,605 Securities sold under agreement to repurchase and federal funds sold 32,199 32,199 — — 32,199 Subordinated debt 189,527 — — 192,149 192,149 Other borrowings 16,598 — 16,598 — 16,598 Interest payable 6,772 327 4,210 2,235 6,772 Derivatives 48,242 — 48,242 — 48,242 Fair Value December 31, 2019 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 232,681 $ 232,681 $ — $ — $ 232,681 Investment securities 691,676 — 691,676 — 691,676 Loans, net 4,378,503 — — 4,363,903 4,363,903 Loans held for sale 262,518 — 262,518 — 262,518 Interest receivable 17,083 — 3,282 13,801 17,083 Mortgage servicing rights 75,521 — — 75,521 75,521 Derivatives 21,981 — 21,981 — 21,981 Financial liabilities: Deposits: Without stated maturities $ 3,743,085 $ 3,743,085 $ — $ — $ 3,743,085 With stated maturities 1,191,853 — 1,200,145 — 1,200,145 Securities sold under agreement to repurchase and federal funds sold 23,745 23,745 — — 23,745 Federal Home Loan Bank advances 250,000 — 250,213 — 250,213 Subordinated debt 30,930 — 29,706 — 29,706 Interest payable 6,465 376 6,089 — 6,465 Derivatives 17,933 — 17,933 — 17,933
Schedule of Balances and Levels of Assets Measured at Fair Value on Recurring Basis	The balances and levels of the assets measured at fair value on a recurring basis at December 31, 2020 are presented in the following table: December 31, 2020 Quoted prices Significant Significant unobservable Total Recurring valuations: Financial assets: Available-for-sale securities: U.S. government agency securities $ — $ 2,003 $ — $ 2,003 Mortgage-backed securities - residential — 773,336 — 773,336 Mortgage-backed securities - commercial — 21,588 — 21,588 Municipals, tax-exempt — 356,329 — 356,329 Treasury securities — 16,628 — 16,628 Corporate securities — 2,516 — 2,516 Equity securities — 4,591 — 4,591 Total $ — $ 1,176,991 $ — $ 1,176,991 Loans held for sale $ — $ 683,770 $ 215,403 $ 899,173 Mortgage servicing rights — — 79,997 79,997 Derivatives — 68,938 — 68,938 Financial Liabilities: Derivatives — 48,242 — 48,242 The balances and levels of the assets measured at fair value on a recurring basis at December 31, 2019 are presented in the following table: At December 31, 2019 Quoted prices Significant Significant unobservable Total Recurring valuations: Financial assets: Available-for-sale securities: Mortgage-backed securities - residential $ — $ 477,312 $ — $ 477,312 Mortgage-backed securities - commercial — 13,364 — 13,364 Municipals, tax-exempt — 189,235 — 189,235 Treasury securities — 7,448 — 7,448 Corporate securities — 1,022 — 1,022 Equity securities — 3,295 — 3,295 Total $ — $ 691,676 $ — $ 691,676 Loans held for sale $ — $ 262,518 $ — $ 262,518 Mortgage servicing rights — — 75,521 75,521 Derivatives — 21,981 — 21,981 Financial Liabilities: Derivatives — 17,933 — 17,933
Schedule of Balances and Levels of Assets Measured at Fair Value on Non-recurring Basis	The balances and levels of the assets measured at fair value on a non-recurring basis at December 31, 2020 are presented in the following table: At December 31, 2020 Quoted prices Significant Significant unobservable Total Non-recurring valuations: Financial assets: Other real estate owned $ — $ — $ 6,662 $ 6,662 Collateral dependent loans: Commercial and industrial $ — $ — $ 1,728 $ 1,728 Construction — — 3,877 3,877 Residential real estate: 1-4 family mortgage — — 226 226 Residential line of credit — — 1,174 1,174 Commercial real estate: Non-owner occupied — — 3,391 3,391 Consumer and other — — 8,164 8,164 Total collateral dependent loans $ — $ — $ 18,560 $ 18,560 The balances and levels of the assets measured at fair value on a non-recurring basis at December 31, 2019 are presented in the following table: At December 31, 2019 Quoted prices Significant Significant unobservable Total Non-recurring valuations: Financial assets: Other real estate owned $ — $ — $ 9,774 $ 9,774 Impaired Loans (1) : Commercial and industrial $ — $ — $ 6,481 $ 6,481 Residential real estate: 1-4 family mortgage — — 378 378 Residential line of credit — — 321 321 Commercial real estate: Owner occupied — — 951 951 Non-owner occupied — — 2,560 2,560 Total $ — $ — $ 10,691 $ 10,691 (1) Includes both impaired non-purchased loans and collateral-dependent PCI loans.
Schedule of Information About Significant Unobservable Inputs (Level 3) Used in Valuation of Assets Measured at Fair Value on Nonrecurring Basis	The following table presents information as of December 31, 2020 about significant unobservable inputs (Level 3) used in the valuation of assets measured at fair value on a nonrecurring basis: Financial instrument Fair Value Valuation technique Significant Range of Collateral dependent loans $ 18,560 Valuation of collateral Discount for comparable sales 0%-30% Other real estate owned $ 6,662 Appraised value of property less costs to sell Discount for costs to sell 0%-15% The following table presents information as of December 31, 2019 about significant unobservable inputs (Level 3) used in the valuation of assets measured at fair value on a nonrecurring basis: Financial instrument Fair Value Valuation technique Significant Range of Impaired loans (1) $ 10,691 Valuation of collateral Discount for comparable sales 0%-30% Other real estate owned $ 9,774 Appraised value of property less costs to sell Discount for costs to sell 0%-15%
Schedule of Differences between Fair Value and Principal Balance for Loans Held for Sale Measured at Fair Value	The following table summarizes the differences between the fair value and the principal balance for loans held for sale and nonaccrual loans measured at fair value as of December 31, 2020 and 2019: December 31, 2020 Aggregate Aggregate Difference Mortgage loans held for sale measured at fair value $ 683,770 $ 651,887 $ 31,883 Commercial loans held for sale measured at fair value 208,914 226,867 (17,953) Past due loans of 90 days or more 83 163 (80) Nonaccrual loans 6,406 12,033 (5,627) December 31, 2019 Mortgage loans held for sale measured at fair value $ 262,518 $ 254,868 $ 7,650 Past due loans of 90 days or more — — — Nonaccrual loans — — —

Parent company financial stat_2

Parent company financial statements (Tables)	12 Months Ended
	Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract]
Balance Sheet	As of December 31, Balance sheet 2020 2019 Assets Cash and cash equivalents (1) $ 5,310 $ 4,673 Investments: Equity securities, at fair value 1,173 — Investment in subsidiaries (1) 1,378,347 782,565 Other assets 12,240 6,292 Goodwill 29 29 Total assets $ 1,397,099 $ 793,559 Liabilities and shareholders' equity Liabilities Borrowings $ 106,299 $ 30,930 Accrued expenses and other liabilities (489) 300 Total liabilities 105,810 31,230 Shareholders' equity Common stock 47,222 31,034 Additional paid-in capital 898,847 425,633 Retained earnings 317,625 293,524 Accumulated other comprehensive income 27,595 12,138 Total shareholders' equity 1,291,289 762,329 Total liabilities and shareholders' equity $ 1,397,099 $ 793,559 (1) Eliminates in Consolidation
Income Statements	For the years ended December 31, Income Statements 2020 2019 2018 Income Dividend income from subsidiaries (1) $ 49,706 $ — $ — Gain on investments 217 — — (Loss) gain on other assets — (16) 297 Other income 1,732 211 — Total income 51,655 195 297 Expenses Interest expense 3,122 1,638 1,651 Salaries, legal and professional fees 1,458 1,056 1,481 Other noninterest expense 283 120 960 Total expenses 4,863 2,814 4,092 Income (loss) before income tax benefit and equity in undistributed 46,792 (2,619) (3,795) Federal and state income tax benefit (1,155) (683) (746) Income (loss) before equity in undistributed earnings of subsidiaries 47,947 (1,936) (3,049) Equity in undistributed earnings from subsidiaries (1) 15,674 85,750 83,285 Net income $ 63,621 $ 83,814 $ 80,236 (1) Eliminates in Consolidation
Statement of Cash Flows	For the years ended December 31, Statement of Cash Flows 2020 2019 2018 Operating Activities Net income $ 63,621 $ 83,814 $ 80,236 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed income of subsidiaries (15,674) (85,750) (83,285) Gain on investments (217) — — Loss (gain) on other assets — 16 (297) Stock-based compensation expense 10,214 7,089 7,207 (Increase) decrease in other assets (9,717) 1,056 (441) Decrease in other liabilities (13,363) (9,711) (7,737) Net provided by (used in) operating activities 34,864 (3,486) (4,317) Investing Activities Proceeds from sale of other assets — — 869 Net cash paid in business combinations (See Note 2) (35,505) — — Net cash (used in) provided by investing activities (35,505) — 869 Financing Activities Accretion of interest rate premium on subordinated debt (436) — — Payment of dividends (14,264) (10,045) (6,137) Proceeds of other borrowings 15,000 — — Net proceeds from sale of common stock 978 804 1,196 Net cash used in financing activities 1,278 (9,241) (4,941) Net decrease in cash and cash equivalents 637 (12,727) (8,389) Cash and cash equivalents at beginning of year 4,673 17,400 25,789 Cash and cash equivalents at end of year $ 5,310 $ 4,673 $ 17,400 Supplemental noncash disclosures: Dividends declared not paid on restricted stock units $ 238 $ 149 $ 226 Noncash dividend from Bank 956 — 572

Segment reporting (Tables)

Segment reporting (Tables)	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Schedule of Segment Financial Information	Year Ended December 31, 2020 Banking (4) Mortgage Consolidated Net interest income $ 265,581 $ 77 $ 265,658 Provisions for credit losses (1) 107,967 — 107,967 Mortgage banking income 75,426 214,276 289,702 Change in fair value of mortgage servicing rights, net of hedging (2) — (34,374) (34,374) Other noninterest income 46,527 — 46,527 Depreciation and amortization 6,425 584 7,009 Amortization of intangibles 5,323 — 5,323 Other noninterest mortgage banking expense 49,010 101,798 150,808 Other noninterest expense (3) 212,890 1,055 213,945 Income before income taxes $ 5,919 $ 76,542 $ 82,461 Income tax expense 18,832 Net income applicable to FB Financial Corporation and noncontrolling interest $ 63,629 Net income applicable to noncontrolling interest 8 Net income applicable to FB Financial Corporation $ 63,621 Total assets $ 10,529,812 $ 677,518 $ 11,207,330 Goodwill 242,561 — 242,561 (1) Included $13,361 in provision for credit losses on unfunded commitments. (2) Included in mortgage banking income in the Company's consolidated statements of income. (3) Included $33,824 of merger costs in the Banking segment related to the acquisition and integration of Farmers National and Franklin, and $1,055 of merger costs in the Mortgage segment related to the Franklin merger. (4) Banking segment includes noncontrolling interest. Year Ended December 31, 2019 Mortgage Consolidated Net interest income $ 226,098 $ (62) $ 226,036 Provision for credit losses 7,053 — 7,053 Mortgage banking income 30,429 87,476 117,905 Change in fair value of mortgage servicing rights, net of hedging (1) — (16,989) (16,989) Other noninterest income 34,481 — 34,481 Depreciation and amortization 4,670 506 5,176 Amortization of intangibles 4,339 — 4,339 Other noninterest mortgage banking expense 23,216 65,457 88,673 Other noninterest expense (2) 144,658 1,995 146,653 Income before income taxes $ 107,072 $ 2,467 $ 109,539 Income tax expense 25,725 Net income $ 83,814 Total assets $ 5,795,888 $ 329,033 $ 6,124,921 Goodwill 169,051 — 169,051 (1) Included in mortgage banking income in the Company's consolidated statements of income. (2) Includes $5,385 in merger costs in the Banking segment related to the Atlantic Capital branch acquisition and $1,995 in mortgage restructuring charges in the Mortgage segment. Year Ended December 31, 2018 Banking Mortgage Consolidated Net interest income $ 204,517 $ (449) $ 204,068 Provision for loan loss 5,398 — 5,398 Mortgage banking income 25,460 83,874 109,334 Change in fair value of mortgage servicing rights, net of hedging (1) — (8,673) (8,673) Other noninterest income 29,981 — 29,981 Depreciation and amortization 3,827 507 4,334 Amortization of intangibles 3,185 — 3,185 Other noninterest mortgage banking expense 21,671 73,068 94,739 Other noninterest expense (2) 121,200 — 121,200 Income before income taxes $ 104,677 $ 1,177 $ 105,854 Income tax expense 25,618 Net income $ 80,236 Total assets $ 4,752,111 $ 384,653 $ 5,136,764 Goodwill 137,090 100 137,190 (1) Included in mortgage banking income in the Company's consolidated statements of income. (2) Included $1,594 in merger costs and $671 in costs related to follow-on secondary offering in the Banking segment.

Minimum capital requirements (T

Minimum capital requirements (Tables)	12 Months Ended
	Dec. 31, 2020
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Schedule of Actual and Required Capital Amounts and Ratios	Actual and required capital amounts and ratios are included below for the periods presented. Actual Minimum Capital To be well capitalized Amount Ratio Amount Ratio Amount Ratio December 31, 2020 Total Capital (to risk-weighted assets) FB Financial Corporation $ 1,358,897 15.0 % $ 952,736 10.5 % N/A N/A FirstBank 1,353,279 14.9 % 951,327 10.5 % $ 906,026 10.0 % Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 1,090,364 12.0 % $ 771,262 8.5 % N/A N/A FirstBank 1,142,548 12.6 % 770,122 8.5 % $ 724,820 8.0 % Tier 1 Capital (to average assets) FB Financial Corporation $ 1,090,364 10.0 % $ 435,064 4.0 % N/A N/A FirstBank 1,142,548 10.5 % 435,279 4.0 % $ 544,098 5.0 % Common Equity Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 1,060,364 11.7 % $ 635,157 7.0 % N/A N/A FirstBank 1,142,548 12.6 % 634,218 7.0 % $ 588,917 6.5 % Actual Minimum Capital To be well capitalized Amount Ratio Amount Ratio Amount Ratio December 31, 2019 Total Capital (to risk-weighted assets) FB Financial Corporation $ 633,549 12.2 % $ 545,268 10.5 % N/A N/A FirstBank 623,432 12.1 % 540,995 10.5 % $ 515,233 10.0 % Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 602,410 11.6 % $ 441,421 8.50 % N/A N/A FirstBank 592,293 11.5 % 437,782 8.50 % $ 412,030 8.0 % Tier 1 Capital (to average assets) FB Financial Corporation $ 602,410 10.1 % $ 238,578 4.00 % N/A N/A FirstBank 592,293 9.9 % 239,310 4.00 % $ 299,138 5.0 % Common Equity Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 572,410 11.1 % $ 360,979 7.0 % N/A N/A FirstBank 592,293 11.5 % 360,526 7.0 % $ 334,774 6.5 %

Stock-based compensation (Table

Stock-based compensation (Tables)	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Schedule of Changes in Restricted Stock Units	The following table summarizes information about the changes in restricted stock units as of and for the year ended December 31, 2020: Restricted Stock Weighted Balance at beginning of period 826,263 $ 23.76 Granted (1) 420,521 31.35 Vested (177,581) 31.64 Forfeited (22,132) 33.20 Balance at end of period 1,047,071 $ 26.06 (1) Includes 118,776 restricted stock units issued in replacement of those initially granted by Franklin. See Note 2, "Mergers and acquisitions" for additional information.

Related party transactions (Tab

Related party transactions (Tables)	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Schedule of Loans Analysis to Executive Officers, Certain Management, Bank Directors and Their Affiliates	An analysis of loans to executive officers, certain management, and directors of the Bank and their affiliates is presented below: Loans outstanding at January 1, 2020 $ 30,880 New loans and advances 10,492 Change in related party status (3,462) Repayments (13,235) Loans outstanding at December 31, 2020 $ 24,675

Quarterly Results of Operatio_2

Quarterly Results of Operations (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Results of Operations (Unaudited)	Summarized unaudited quarterly operating results for the Company for the years ending December 31, 2020 and 2019 are as follows: 2020 First Second Third Fourth Interest income $ 69,674 $ 65,607 $ 81,127 $ 98,236 Interest expense 13,425 10,270 12,299 12,992 Net interest income 56,249 55,337 68,828 85,244 Provision for credit losses 27,964 24,039 45,834 (3,231) Provision for credit losses on unfunded commitments 1,601 1,882 9,567 311 Net interest income after provision for loan losses 26,684 29,416 13,427 88,164 Noninterest income 42,700 81,491 97,026 80,638 Noninterest expense 68,559 80,579 118,092 109,855 Income tax expense (benefit) 80 7,455 (2,040) 13,337 Net income (loss) attributable to FB Financial Corporation and noncontrolling interest $ 745 $ 22,873 $ (5,599) $ 45,610 Net income applicable to noncontrolling interest — — — 8 Net income (loss) applicable to FB Financial Corporation $ 745 $ 22,873 $ (5,599) $ 45,602 Weighted average common shares outstanding: Basic 31,257,739 32,094,274 40,154,841 47,204,738 Fully diluted 31,734,112 32,506,417 40,637,745 47,791,659 Earnings per share Basic $ 0.02 $ 0.71 $ (0.14) $ 0.97 Fully diluted $ 0.02 $ 0.70 $ (0.14) $ 0.95 2019 First Second Third Fourth Interest income $ 65,933 $ 71,719 $ 73,242 $ 71,643 Interest expense 12,917 14,696 14,937 13,951 Net interest income 53,016 57,023 58,305 57,692 Provision for loan losses 1,391 881 1,831 2,950 Net interest income after provision for loan losses 51,625 56,142 56,474 54,742 Noninterest income 29,039 32,979 38,145 35,234 Noninterest expense 55,101 64,119 62,935 62,686 Income tax expense 5,975 6,314 7,718 5,718 Net income $ 19,588 $ 18,688 $ 23,966 $ 21,572 Weighted average common shares outstanding: Basic 30,786,684 30,859,596 30,899,583 30,934,092 Fully diluted 31,349,198 31,378,018 31,425,573 31,470,565 Earnings per share Basic $ 0.63 $ 0.60 $ 0.77 $ 0.69 Fully diluted $ 0.62 $ 0.59 $ 0.76 $ 0.68

Basis of presentation - Narrati

Basis of presentation - Narrative (Details)	12 Months Ended
	Dec. 31, 2020USD ($)branchmethod	Dec. 31, 2019USD ($)branch	Dec. 31, 2018USD ($)	Jan. 01, 2020USD ($)	Dec. 31, 2017USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of full-service branches | branch	81
Provision for credit losses on available-for-sale securities	$ 0
Transfer from loans held for sale to loan portfolio	55,766,000	$ 12,259,000	$ 14,732,000
Transfer of from loan portfolio to held for sale	$ 11,483,000	7,891,000	11,888,000
Adjustments for transfers to loans HFS			349,000
Percent of remaining principal allowed to buy back under GNMA optional repurchase programs	100.00%
Lessee, number of finance leases | branch	1
Cumulative effect adjustment of adoption of accounting principle	$ (1,291,382,000)	(762,329,000)	(671,857,000)
Goodwill impairment	0	0
Amounts related to uncertain tax positions	0	0	0
Impairment of long-lived assets	$ 0	0
Number of methods to deliver mortgage loans | method	2
Deposits with Federal Home Loan Banks	$ 12,729,000	11,225,000
FHLB lender risk account guaranty	$ 6,183,000	5,546,000
Lender risk account, contribution percentage	1
Lender risk account, period to release portion of funds not used to cover losses	30 years
Lender risk account, initial fill-up period	5 years
Loans	$ 7,082,959,000	$ 4,409,642,000	3,667,511,000	$ 4,409,642,000
Residential mortgage
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Transfer of from loan portfolio to held for sale	$ 2,116,000
PSUs
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Criteria period	3 years
Franklin Financial Network, Inc.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lessee, number of finance leases | branch	1	0
Mortgage Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net gains (losses) from fair value changes of mortgage loans	$ 24,233,000	$ (2,861,000)	(4,539,000)
GNMA
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Transfer of from loan portfolio to held for sale	9,367,000	7,891,000	0
Delinquent GNMA loans that had been previously sold	151,184,000	51,705,000
Residential Mortgage Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Transfer from loans held for sale to loan portfolio	55,766,000	12,259,000	14,732,000
FHLB Cincinnati
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deposits with Federal Home Loan Banks	$ 12,729,000	11,225,000
Leasehold improvements | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life	20 years
Premises
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life	40 years
Furniture and fixtures | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life	7 years
Furniture and fixtures | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life	10 years
Equipment | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life	3 years
Equipment | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life	7 years
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment of adoption of accounting principle	$ (317,625,000)	(293,524,000)	(221,213,000)
Cumulative effect of change in accounting principle
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment of adoption of accounting principle		$ 25,018,000	1,309,000		$ 0
Loans				558,000
Cumulative effect of change in accounting principle | Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment of adoption of accounting principle			$ 1,309,000	$ 25,018,000	$ 109,000

Basis of presentation - Basic a

Basis of presentation - Basic and Diluted Earnings Per Common Share Calculation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic earnings per common share calculation:
Net income applicable to FB Financial Corporation	$ 45,602	$ (5,599)	$ 22,873	$ 745	$ 21,572	$ 23,966	$ 18,688	$ 19,588	$ 63,621	$ 83,814	$ 80,236
Dividends paid on and undistributed earnings allocated to participating securities									0	(447)	(428)
Earnings available to common shareholders									$ 63,621	$ 83,367	$ 79,808
Weighted average basic shares outstanding (in shares)	47,204,738	40,154,841	32,094,274	31,257,739	30,934,092	30,899,583	30,859,596	30,786,684	37,621,720	30,870,474	30,675,755
Basic earnings per common share (in dollars per share)	$ 0.97	$ (0.14)	$ 0.71	$ 0.02	$ 0.69	$ 0.77	$ 0.60	$ 0.63	$ 1.69	$ 2.70	$ 2.60
Diluted earnings per common share:
Earnings available to common shareholders									$ 63,621	$ 83,367	$ 79,808
Weighted average basic shares outstanding (in shares)	47,204,738	40,154,841	32,094,274	31,257,739	30,934,092	30,899,583	30,859,596	30,786,684	37,621,720	30,870,474	30,675,755
Weighted average diluted shares contingently issuable (in shares)									478,024	532,423	639,226
Weighted average diluted shares outstanding (in shares)	47,791,659	40,637,745	32,506,417	31,734,112	31,470,565	31,425,573	31,378,018	31,349,198	38,099,744	31,402,897	31,314,981
Diluted (loss) earnings per common share (in dollars per share)	$ 0.95	$ (0.14)	$ 0.70	$ 0.02	$ 0.68	$ 0.76	$ 0.59	$ 0.62	$ 1.67	$ 2.65	$ 2.55
Restricted stock units outstanding considered to be antidilutive (in shares)									239,813

Basic of presentation - Impact

Basic of presentation - Impact on the Consolidated Balance Sheet Effect of Adoption of ASU 2016-13 (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Loans	$ 7,082,959	$ 4,409,642	$ 4,409,642	$ 3,667,511
Allowance for credit losses	(170,389)	(31,139)	(31,139)	(28,932)	$ (24,041)
Total assets	11,207,330		6,124,921	$ 5,136,764
Liabilities and shareholders' equity
Allowance for credit losses on unfunded commitments		0
Net deferred tax liability		20,490	20,490
Retained earnings	317,625	293,524	293,524
Total liabilities and shareholders' equity	$ 11,207,330		$ 6,124,921
Cumulative effect adjustment to adopt ASC 326
ASSETS
Loans		558
Allowance for credit losses		(31,446)
Total assets		(30,888)
Liabilities and shareholders' equity
Allowance for credit losses on unfunded commitments		2,947
Net deferred tax liability		(8,817)
Retained earnings		(25,018)
Total liabilities and shareholders' equity		(30,888)
Balance at January 1, 2020 (post ASC 326 adoption)
ASSETS
Loans		4,410,200
Allowance for credit losses		(62,585)
Liabilities and shareholders' equity
Allowance for credit losses on unfunded commitments		2,947
Net deferred tax liability		11,673
Retained earnings		$ 268,506

Mergers and acquisitions - Fran

Mergers and acquisitions - Franklin Financial Network, Inc. - Narrative (Details) $ / shares in Units, $ in Thousands	Aug. 15, 2020USD ($)branch$ / sharesshares	Dec. 31, 2020USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Business Acquisition [Line Items]
Goodwill resulting from merger				$ 31,961
Merger costs			$ 34,879	$ 5,385	$ 1,594
Franklin Financial Network, Inc.
Business Acquisition [Line Items]
Assets assumed in acquisition	$ 3,631,889
Loans assumed in acquisition	2,790,000
Deposits assumed in acquisition	3,121,731
Non-strategic loans assumed in acquisition	$ 326,206
Business acquisition, shares issued (in shares) | shares	15,058,181
Equivalent value of parent stock (in shares) | shares	44,311
Cash consideration paid	$ 31,330
Business acquisition, stock assumed, pre combination service, fair value	$ 674
Business acquisition, share price (dollar per share) | $ / shares	$ 29.52
Business combination, consideration, value	$ 477,830
Measurement period adjustments to loans held-for-sale, deposits and premises and equipment		$ 6,546
Goodwill resulting from merger	$ 67,191		67,191
Merger costs			$ 32,364
Franklin Financial Network, Inc. | Tennessee
Business Acquisition [Line Items]
Number of branches acquired | branch	10

Mergers and acquisitions - Cons

Mergers and acquisitions - Consideration for Franklin Financial Network (Details) $ / shares in Units, $ in Thousands	Aug. 15, 2020USD ($)$ / sharesshares	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Business Combination, Consideration Transferred [Abstract]
Shares and net shares outstanding (in shares) | shares	15,651,243
Goodwill resulting from merger | $			$ 31,961
Franklin Financial Network, Inc.
Business Combination, Consideration Transferred [Abstract]
Shares outstanding (in shares) | shares	15,588,337
Options converted to net shares (in shares) | shares	62,906
Number of shares outstanding including converted options (in shares) | shares	15,651,243
Exchange ratio	0.965
Shares to be issued as merger consideration (in shares) | shares	15,102,492
Issuance price (dollar per share) | $ / shares	$ 29.52
Value of stock to be issued as merger consideration | $	$ 445,826
Tax withholding on vested restricted stock awards, units and options | $	(1,308)
Value of stock issued | $	$ 444,518
Net shares issued (in shares) | shares	15,058,181
Stock units that do not vest on change in control (in shares) | shares	114,915
Replacement awards issued to employees (in shares) | shares	118,776
Fair value of replacement awards (in shares) | shares	3,506,000
Fair value of replacement awards attributable to pre-combination service | $	$ 674
Cash consideration per share (dollar per share) | $ / shares	$ 2
Cash to be paid | $	$ 31,330
Purchase price | $	477,830
Preliminary fair value of net assets acquired | $	410,639
Goodwill resulting from merger | $	$ 67,191	$ 67,191
Equivalent value of parent stock (in shares) | shares	44,311
Cash paid in lieu of fractional shares | $	$ 28

Mergers and acquisitions - FNB

Mergers and acquisitions - FNB Financial Corp. - Narrative (Details) $ / shares in Units, $ in Thousands	Feb. 14, 2020USD ($)branch$ / sharesshares	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Business Acquisition [Line Items]
Goodwill resulting from merger			$ 31,961
Merger related expenses		$ 34,879	$ 5,385	$ 1,594
FNB Financial Corp.
Business Acquisition [Line Items]
Assets assumed in acquisition	$ 258,218
Loans assumed in acquisition	182,171
Deposits assumed in acquisition	$ 209,535
Business acquisition, shares issued (in shares) | shares	954,797
Cash consideration paid	$ 15,001
Business acquisition, share price (dollar per share) | $ / shares	$ 36.70
Business combination, consideration, value	$ 50,042
Goodwill resulting from merger	$ 6,319	6,319
Merger related expenses		$ 2,338
FNB Financial Corp. | Kentucky
Business Acquisition [Line Items]
Number of branches acquired | branch	4

Mergers and acquisitions - Co_2

Mergers and acquisitions - Consideration for FNB Financial Corp. (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 14, 2020	Dec. 31, 2020	Dec. 31, 2019
Business Combination, Consideration Transferred [Abstract]
Goodwill resulting from merger			$ 31,961
FNB Financial Corp.
Business Combination, Consideration Transferred [Abstract]
Net shares issued (in shares)	954,797
Purchase price per share (dollar per share)	$ 36.70
Value of stock consideration	$ 35,041
Cash consideration paid	15,001
Total purchase price	50,042
Preliminary fair value of net assets acquired	43,723
Goodwill resulting from merger	$ 6,319	$ 6,319

Mergers and acquisitions - Atla

Mergers and acquisitions - Atlantic Capital Bank N.A. Branches - Narrative (Details) $ in Thousands	Apr. 05, 2019USD ($)branch	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Business Acquisition [Line Items]
Goodwill		$ 242,561	$ 169,051	$ 137,190
Atlantic Capital
Business Acquisition [Line Items]
Total purchase price	$ 36,790
Customer deposits	$ 588,877
Deposit premium percentage	6.25%
Loans held for investment, net of fair value adjustments	$ 374,966
Percentage of loans outstanding	99.32%
Goodwill	$ 31,961
Tennessee | Atlantic Capital
Business Acquisition [Line Items]
Number of branches acquired | branch	11
Georgia | Atlantic Capital
Business Acquisition [Line Items]
Number of branches acquired | branch	3

Mergers and acquisitions - Reco

Mergers and acquisitions - Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Aug. 15, 2020	Feb. 14, 2020
Franklin Financial Network, Inc.
Assets
Cash and cash equivalents	$ 284,004
Investments	373,462
Mortgage loans held for sale, at fair value	38,740
Commercial loans held for sale, at fair value	326,206
Loans held for investment, net of fair value adjustments	2,427,527
Allowance for credit losses on PCD loans	(24,831)
Premises and equipment	45,471
Operating lease right-of-use assets	23,958
Mortgage servicing rights	5,111
Core deposit intangible	7,670
Other assets	124,571
Assets assumed in acquisition	3,631,889
Liabilities
Non-interest bearing deposits	505,374
Interest-bearing	1,783,379
Money market and savings	342,093
Customer time deposits	383,433
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Brokered and Internet Time Deposits	107,452
Total deposits	3,121,731
Borrowings	62,435
Operating lease liabilities	24,330
Accrued expenses and other liabilities	12,661
Total liabilities	3,221,157
Noncontrolling interests acquired	93
Net assets acquired	$ 410,639
FNB Financial Corp.
Assets
Cash and cash equivalents		$ 10,774
Investments		50,594
Mortgage loans held for sale, at fair value		0
Commercial loans held for sale, at fair value		0
Loans held for investment, net of fair value adjustments		182,171
Allowance for credit losses on PCD loans		(669)
Premises and equipment		8,049
Operating lease right-of-use assets		14
Mortgage servicing rights		0
Core deposit intangible		2,490
Other assets		4,795
Assets assumed in acquisition		258,218
Liabilities
Non-interest bearing deposits		63,531
Interest-bearing		26,451
Money market and savings		37,002
Customer time deposits		82,551
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Brokered and Internet Time Deposits		0
Total deposits		209,535
Borrowings		3,192
Operating lease liabilities		14
Accrued expenses and other liabilities		1,754
Total liabilities		214,495
Noncontrolling interests acquired		0
Net assets acquired		$ 43,723

Mergers and acquisitions - Purc

Mergers and acquisitions - Purchased Credit-deteriorated Loans (Details) - USD ($) $ in Thousands	Aug. 15, 2020	Feb. 14, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deterioration credit quality since origination, percentage	27.90%	10.10%
Allowance for credit loss, purchased with credit deterioration			$ 25,500
Franklin Financial Network, Inc.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal balance	$ 693,999
Allowance for credit losses at acquisition	(24,831)
Net premium attributable to other factors	8,810
Loans purchased credit-deteriorated fair value	677,978
Allowance for credit loss, purchased with credit deterioration	52,822
Increase in provision for credit losses from unfunded commitments acquired in business combination	$ 10,499
FNB Financial Corp.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal balance		$ 18,964
Allowance for credit losses at acquisition		(669)
Net premium attributable to other factors		63
Loans purchased credit-deteriorated fair value		18,358
Allowance for credit loss, purchased with credit deterioration		$ 2,885

Mergers and acquisitions - Pro

Mergers and acquisitions - Pro Forma Information (unaudited) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Combinations [Abstract]
Net interest income	$ 338,092	$ 348,660	$ 220,269
Total revenues	654,374	504,273	354,258
Net income	$ 65,135	$ 99,898	$ 78,762

Cash and cash equivalents con_2

Cash and cash equivalents concentrations (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Cash and Cash Equivalents [Abstract]
Restricted cash	$ 0	$ 20,881,000
Federal funds sold	$ 121,153,000	$ 131,119,000

Investment securities - Summary

Investment securities - Summary of Amortized Cost of Securities and Fair Values (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Abstract]
Amortized cost	$ 1,137,848,000	$ 676,705,000
Gross unrealized gains	35,376,000	13,567,000
Gross unrealized losses	(824,000)	(1,891,000)
Allowance for credit losses for investments	0
Fair Value	1,172,400,000	688,381,000
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost	2,000,000
Gross unrealized gains	3,000
Gross unrealized losses	0
Allowance for credit losses for investments	0
Fair Value	2,003,000
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Amortized cost	760,099,000	474,144,000
Gross unrealized gains	14,040,000	4,829,000
Gross unrealized losses	(803,000)	(1,661,000)
Allowance for credit losses for investments	0
Fair Value	773,336,000	477,312,000
Mortgage-backed securities - commercial
Debt Securities, Available-for-sale [Abstract]
Amortized cost	20,226,000	12,957,000
Gross unrealized gains	1,362,000	407,000
Gross unrealized losses	0	0
Allowance for credit losses for investments	0
Fair Value	21,588,000	13,364,000
States and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Amortized cost	336,543,000	181,178,000
Gross unrealized gains	19,806,000	8,287,000
Gross unrealized losses	(20,000)	(230,000)
Allowance for credit losses for investments	0
Fair Value	356,329,000	189,235,000
U.S. Treasury securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost	16,480,000	7,426,000
Gross unrealized gains	148,000	22,000
Gross unrealized losses	0	0
Allowance for credit losses for investments	0
Fair Value	16,628,000	7,448,000
Corporate securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost	2,500,000	1,000,000
Gross unrealized gains	17,000	22,000
Gross unrealized losses	(1,000)	0
Allowance for credit losses for investments	0
Fair Value	$ 2,516,000	$ 1,022,000

Investment securities - Narrati

Investment securities - Narrative (Details)	12 Months Ended
	Dec. 31, 2020USD ($)security	Dec. 31, 2019USD ($)security	Dec. 31, 2018USD ($)
Debt and Equity Securities, FV-NI [Line Items]
Accrued interest receivable	$ 43,603,000	$ 17,083,000
Marketable securities at fair value	4,591,000	3,295,000
Trade date payable - securities	0	0	$ 2,120,000
Net unrealized gains on equity securities	$ 296,000	$ 148,000
Number of securities in securities portfolio | security	514	365
Number of securities in securities portfolio, unrealized loss position | security	16	58
Allowance for credit losses for investments	$ 0
Provision for credit losses on available for sale debt securities	0
Other than temporary impairment of equity securities		$ 0
Debt Securities
Debt and Equity Securities, FV-NI [Line Items]
Accrued interest receivable	4,540,000	2,843,000
Collateral Pledged
Debt and Equity Securities, FV-NI [Line Items]
Securities pledged	$ 804,821,000	$ 373,674,000

Investment securities - Schedul

Investment securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amortized cost
Due in one year or less	$ 35,486	$ 1,148
Due in one to five years	24,278	11,553
Due in five to ten years	40,038	18,287
Due in over ten years	257,721	158,616
Amortized cost, total	357,523	189,604
Amortized cost	1,137,848	676,705
Fair value
Due in one year or less	35,662	1,152
Due in one to five years	24,684	11,676
Due in five to ten years	41,332	18,887
Due in over ten years	275,798	165,990
Fair value, total	377,476	197,705
Total debt securities	1,172,400	688,381
Mortgage-backed securities - residential
Amortized cost
Mortgage-backed securities	760,099	474,144
Amortized cost	760,099	474,144
Fair value
Mortgage-backed securities	773,336	477,312
Total debt securities	773,336	477,312
Mortgage-backed securities - commercial
Amortized cost
Mortgage-backed securities	20,226	12,957
Amortized cost	20,226	12,957
Fair value
Mortgage-backed securities	21,588	13,364
Total debt securities	$ 21,588	$ 13,364

Investment securities - Summa_2

Investment securities - Summary of Sales and Other Dispositions of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales	$ 146,494	$ 24,498	$ 2,742
Proceeds from maturities, prepayments and calls	220,549	113,018	73,066
Gross realized gains	1,606	7	9
Gross realized losses	$ 271	$ 98	$ 44

Investment securities - Sched_2

Investment securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	$ 185,695	$ 63,074
Unrealized Loss, Less than 12 months	(824)	(394)
Fair Value, 12 months or more	0	175,730
Unrealized Loss, 12 months or more	0	(1,497)
Fair Value, Total	185,695	238,804
Unrealized Loss, Total	(824)	(1,891)
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	0
Unrealized Loss, Less than 12 months	0
Fair Value, 12 months or more	0
Unrealized Loss, 12 months or more	0
Fair Value, Total	0
Unrealized Loss, Total	0
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	182,012	47,641
Unrealized Loss, Less than 12 months	(803)	(164)
Fair Value, 12 months or more	0	175,730
Unrealized Loss, 12 months or more	0	(1,497)
Fair Value, Total	182,012	223,371
Unrealized Loss, Total	(803)	(1,661)
States and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	3,184	15,433
Unrealized Loss, Less than 12 months	(20)	(230)
Fair Value, 12 months or more	0	0
Unrealized Loss, 12 months or more	0	0
Fair Value, Total	3,184	15,433
Unrealized Loss, Total	(20)	$ (230)
Corporate securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	499
Unrealized Loss, Less than 12 months	(1)
Fair Value, 12 months or more	0
Unrealized Loss, 12 months or more	0
Fair Value, Total	499
Unrealized Loss, Total	$ (1)

Loans and allowance for credi_3

Loans and allowance for credit losses - Loans Outstanding by Class of Financing Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Past Due [Line Items]
Gross loans	$ 7,082,959	$ 4,409,642	$ 4,409,642	$ 3,667,511
Less: Allowance for credit losses	(170,389)	$ (31,139)	(31,139)	(28,932)	$ (24,041)
Net loans	6,912,570		4,378,503
Loans originated as part of PPP program	212,645
Paycheck Protection Program
Financing Receivable, Past Due [Line Items]
Loans originated as part of PPP program	212,645
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Gross loans	1,346,122		1,034,036	867,083
Less: Allowance for credit losses	(14,748)		(4,805)	(5,348)	(4,461)
Construction
Financing Receivable, Past Due [Line Items]
Gross loans	1,222,220		551,101	556,051
Less: Allowance for credit losses	(58,477)		(10,194)	(9,729)	(7,135)
Residential real estate | 1-to-4 family mortgage
Financing Receivable, Past Due [Line Items]
Gross loans	1,089,270		710,454	555,815
Less: Allowance for credit losses	(19,220)		(3,112)	(3,428)	(3,197)
Residential real estate | Residential line of credit
Financing Receivable, Past Due [Line Items]
Gross loans	408,211		221,530	190,480
Less: Allowance for credit losses	(10,534)		(752)	(811)	(944)
Residential real estate | Multi-family mortgage
Financing Receivable, Past Due [Line Items]
Gross loans	175,676		69,429	75,457
Less: Allowance for credit losses	(7,174)		(544)	(566)	(434)
Residential real estate | Non-owner occupied
Financing Receivable, Past Due [Line Items]
Gross loans	1,598,979
Commercial real estate
Financing Receivable, Past Due [Line Items]
Gross loans	924,841
Commercial real estate | Owner occupied
Financing Receivable, Past Due [Line Items]
Gross loans	924,841		630,270	493,524
Less: Allowance for credit losses	(4,849)		(4,109)	(3,132)	(3,558)
Commercial real estate | Non-owner occupied
Financing Receivable, Past Due [Line Items]
Gross loans	1,598,979		920,744	700,248
Less: Allowance for credit losses	(44,147)		(4,621)	(4,149)	(2,817)
Consumer and other
Financing Receivable, Past Due [Line Items]
Gross loans	317,640		272,078	228,853
Less: Allowance for credit losses	$ (11,240)		$ (3,002)	$ (1,769)	$ (1,495)

Loans and allowance for credi_4

Loans and allowance for credit losses - Narrative (Details) - USD ($)	Aug. 15, 2020	Mar. 22, 2020	Feb. 14, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Accrued interest receivable					$ 38,316,000
Accretion of interest income					3,788,000	$ 8,556,000	$ 7,608,000
Total accretion excluded interest income						8,556,000	7,608,000
Recorded investment in TDRs					15,988,000	12,206,000
Allocation to specific reserves					310,000	360,000
Commitment to lend additional amounts to troubled debt restructuring					0	0
TDRs classified as non-accruals					8,279,000	5,201,000
Payment default for loans modified as troubled debt restructurings					0	0	0
Classification of TDR, exemption period, CARES ACT		60 days
Deferred loans that were transferred to normal payment status					1,399,088,000
PCI Loans
Financing Receivable, Past Due [Line Items]
Carrying value of PCI loans						57,152,000	68,999,000
Purchase accounting liquidity discount						292,000	2,436,000
Purchase accounting non accretable credit discount						3,537,000	4,355,000
Accretion of interest income						7,003,000	9,010,000
Non-PCI Loans
Financing Receivable, Past Due [Line Items]
Purchase accounting liquidity discount						3,924,000	2,197,000
Purchase accounting accretable credit discount						8,964,000	$ 7,527,000
Minimum
Financing Receivable, Past Due [Line Items]
Payment deferral period				60 days
Maximum
Financing Receivable, Past Due [Line Items]
Payment deferral period				90 days
Federal Reserve Bank
Financing Receivable, Past Due [Line Items]
Pledged loans to the Federal Reserve Bank					2,463,281,000	1,407,662,000
Residential Mortgage Loans | FHLB Cincinnati
Financing Receivable, Past Due [Line Items]
Pledge loans to the Federal Home Loan Bank securing advances					1,248,857,000	412,966,000
Commercial Loan | FHLB Cincinnati
Financing Receivable, Past Due [Line Items]
Pledge loans to the Federal Home Loan Bank securing advances					$ 1,532,749,000	$ 545,540,000
Franklin Financial Network, Inc.
Financing Receivable, Past Due [Line Items]
Increase in allowance for credit losses	$ 77,653,000
Farmers National
Financing Receivable, Past Due [Line Items]
Increase in allowance for credit losses			$ 4,494,000

Loans and allowance for credi_5

Loans and allowance for credit losses - Changes in Allowance for Credit Losses by Class of Financing Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 31,139	$ 28,932	$ 24,041
Provision for credit losses	94,606	7,053	5,398
Recoveries of loans previously charged-off	3,003	1,106	2,647
Loans charged off	(15,305)	(5,952)	(2,805)
Initial allowance on loans purchased with deteriorated credit quality	25,500
Adjustments for transfers to loans HFS			(349)
Balance at end of period	170,389	31,139	28,932
Non-purchased credit deteriorated loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	30,888
Balance at end of period		30,888
Purchased Credit Impaired loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	558
Balance at end of period		558
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	4,805	5,348	4,461
Provision for credit losses	13,830	2,251	1,395
Recoveries of loans previously charged-off	1,712	136	390
Loans charged off	(11,735)	(2,930)	(898)
Initial allowance on loans purchased with deteriorated credit quality	754
Adjustments for transfers to loans HFS			0
Balance at end of period	14,748	4,805	5,348
Commercial and industrial | Non-purchased credit deteriorated loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	5,300
Balance at end of period		5,300
Commercial and industrial | Purchased Credit Impaired loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	82
Balance at end of period		82
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	10,194	9,729	7,135
Provision for credit losses	40,807	454	1,459
Recoveries of loans previously charged-off	205	11	1,164
Loans charged off	(18)	0	(29)
Initial allowance on loans purchased with deteriorated credit quality	5,606
Adjustments for transfers to loans HFS			0
Balance at end of period	58,477	10,194	9,729
Construction | Non-purchased credit deteriorated loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	1,533
Balance at end of period		1,533
Construction | Purchased Credit Impaired loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	150
Balance at end of period		150
Residential real estate | 1-to-4 family mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	3,112	3,428	3,197
Provision for credit losses	6,408	(175)	547
Recoveries of loans previously charged-off	122	79	171
Loans charged off	(403)	(220)	(138)
Initial allowance on loans purchased with deteriorated credit quality	1,640
Adjustments for transfers to loans HFS			(349)
Balance at end of period	19,220	3,112	3,428
Residential real estate | 1-to-4 family mortgage | Non-purchased credit deteriorated loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	7,920
Balance at end of period		7,920
Residential real estate | 1-to-4 family mortgage | Purchased Credit Impaired loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	421
Balance at end of period		421
Residential real estate | Residential line of credit
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	752	811	944
Provision for credit losses	5,649	112	(275)
Recoveries of loans previously charged-off	125	138	178
Loans charged off	(22)	(309)	(36)
Initial allowance on loans purchased with deteriorated credit quality	572
Adjustments for transfers to loans HFS			0
Balance at end of period	10,534	752	811
Residential real estate | Residential line of credit | Non-purchased credit deteriorated loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	3,461
Balance at end of period		3,461
Residential real estate | Residential line of credit | Purchased Credit Impaired loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	(3)
Balance at end of period		(3)
Residential real estate | Multi-family mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	544	566	434
Provision for credit losses	5,506	(22)	132
Recoveries of loans previously charged-off	0	0	0
Loans charged off	0	0	0
Initial allowance on loans purchased with deteriorated credit quality	784
Adjustments for transfers to loans HFS			0
Balance at end of period	7,174	544	566
Residential real estate | Multi-family mortgage | Non-purchased credit deteriorated loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	340
Balance at end of period		340
Residential real estate | Multi-family mortgage | Purchased Credit Impaired loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	0
Balance at end of period		0
Commercial real estate | Owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	4,109	3,132	3,558
Provision for credit losses	(1,739)	869	(478)
Recoveries of loans previously charged-off	83	108	143
Loans charged off	(304)	0	(91)
Initial allowance on loans purchased with deteriorated credit quality	659
Adjustments for transfers to loans HFS			0
Balance at end of period	4,849	4,109	3,132
Commercial real estate | Owner occupied | Non-purchased credit deteriorated loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	1,879
Balance at end of period		1,879
Commercial real estate | Owner occupied | Purchased Credit Impaired loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	162
Balance at end of period		162
Commercial real estate | Non-owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	4,621	4,149	2,817
Provision for credit losses	17,789	484	1,281
Recoveries of loans previously charged-off	0	0	51
Loans charged off	(711)	(12)	0
Initial allowance on loans purchased with deteriorated credit quality	15,442
Adjustments for transfers to loans HFS			0
Balance at end of period	44,147	4,621	4,149
Commercial real estate | Non-owner occupied | Non-purchased credit deteriorated loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	6,822
Balance at end of period		6,822
Commercial real estate | Non-owner occupied | Purchased Credit Impaired loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	184
Balance at end of period		184
Consumer and other
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	3,002	1,769	1,495
Provision for credit losses	6,356	3,080	1,337
Recoveries of loans previously charged-off	756	634	550
Loans charged off	(2,112)	(2,481)	(1,613)
Initial allowance on loans purchased with deteriorated credit quality	43
Adjustments for transfers to loans HFS			0
Balance at end of period	11,240	3,002	$ 1,769
Consumer and other | Non-purchased credit deteriorated loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	3,633
Balance at end of period		3,633
Consumer and other | Purchased Credit Impaired loans | Cumulative effect of change in accounting principle
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ (438)
Balance at end of period		$ (438)

Loans and allowance for credi_6

Loans and allowance for credit losses - Allowance for Credit Losses by Class of Financing Receivable Disaggregated by Measurement Methodology (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	$ 2,039		$ 895	$ 268
Collectively evaluated for credit loss/impairment	149,405		28,571	27,783
Ending balance	170,389	$ 31,139	31,139	28,932	$ 24,041
Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	18,945		1,673	881
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	373		241	3
Collectively evaluated for credit loss/impairment	13,493		4,457	5,247
Ending balance	14,748		4,805	5,348	4,461
Commercial and industrial | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	882		107	98
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	95		0	0
Collectively evaluated for credit loss/impairment	54,065		10,192	9,677
Ending balance	58,477		10,194	9,729	7,135
Construction | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	4,317		2	52
Residential real estate | 1-to-4 family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	0		8	7
Collectively evaluated for credit loss/impairment	17,206		2,940	3,205
Ending balance	19,220		3,112	3,428	3,197
Residential real estate | 1-to-4 family mortgage | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	2,014		164	216
Residential real estate | Residential line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	9		9	0
Collectively evaluated for credit loss/impairment	10,031		743	811
Ending balance	10,534		752	811	944
Residential real estate | Residential line of credit | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	494		0	0
Residential real estate | Multi-family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	0		0	0
Collectively evaluated for credit loss/impairment	6,326		544	566
Ending balance	7,174		544	566	434
Residential real estate | Multi-family mortgage | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	848		0	0
Commercial real estate | Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	30		238	53
Collectively evaluated for credit loss/impairment	4,062		3,853	3,066
Ending balance	4,849		4,109	3,132	3,558
Commercial real estate | Owner occupied | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	757		18	13
Commercial real estate | Non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	1,531		399	205
Collectively evaluated for credit loss/impairment	33,706		3,909	3,628
Ending balance	44,147		4,621	4,149	2,817
Commercial real estate | Non-owner occupied | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	8,910		313	316
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	1		0	0
Collectively evaluated for credit loss/impairment	10,516		1,933	1,583
Ending balance	11,240		3,002	1,769	$ 1,495
Consumer and other | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	$ 723		$ 1,069	$ 186

Loans and allowance for credi_7

Loans and allowance for credit losses - Amount of Loans by Loan Class of Financing Receivable Individually and Collectively Evaluated for Impairment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	$ 38,205		$ 23,810	$ 13,716
Collectively evaluated for credit loss/impairment	6,329,868		4,328,680	3,584,796
Loans	7,082,959	$ 4,409,642	4,409,642	3,667,511
Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	714,886		57,152	68,999
Loans			57,152
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	15,578		9,026	1,847
Collectively evaluated for credit loss/impairment	1,270,058		1,023,326	863,788
Loans	1,346,122		1,034,036	867,083
Commercial and industrial | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	60,486		1,684	1,448
Loans			1,684
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	4,851		2,061	1,221
Collectively evaluated for credit loss/impairment	1,140,634		546,156	549,075
Loans	1,222,220		551,101	556,051
Construction | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	76,735		2,884	5,755
Loans			2,884
Residential real estate | 1-to-4 family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	848		1,347	987
Collectively evaluated for credit loss/impairment	987,142		689,769	535,451
Loans	1,089,270		710,454	555,815
Residential real estate | 1-to-4 family mortgage | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	101,280		19,338	19,377
Loans			19,338
Residential real estate | Residential line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	412		579	245
Collectively evaluated for credit loss/impairment	387,250		220,878	190,235
Loans	408,211		221,530	190,480
Residential real estate | Residential line of credit | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	20,549		73	0
Loans			73
Residential real estate | Multi-family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	0		0	0
Collectively evaluated for credit loss/impairment	156,447		69,429	75,457
Loans	175,676		69,429	75,457
Residential real estate | Multi-family mortgage | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	19,229		0	0
Loans			0
Residential real estate | Non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,598,979
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	924,841
Commercial real estate | Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	7,846		2,993	2,608
Collectively evaluated for credit loss/impairment	813,151		621,386	484,900
Loans	924,841		630,270	493,524
Commercial real estate | Owner occupied | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	103,844		5,891	6,016
Loans			5,891
Commercial real estate | Non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	8,631		7,755	6,735
Collectively evaluated for credit loss/impairment	1,272,203		902,792	677,247
Loans	1,598,979		920,744	700,248
Commercial real estate | Non-owner occupied | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	318,145		10,197	16,266
Loans			10,197
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for credit loss/impairment	39		49	73
Collectively evaluated for credit loss/impairment	302,983		254,944	208,643
Loans	317,640		272,078	228,853
Consumer and other | Purchased Credit Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for credit loss/impairment	$ 14,618		17,085	$ 20,137
Loans			$ 17,085

Loans and allowance for credi_8

Loans and allowance for credit losses - Credit Quality of Loan Portfolio by Year of Origination (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	$ 1,517,481
2019	1,246,239
2018	853,371
2017	696,494
2016	648,821
Prior	900,082
Revolving Loans Amortized Cost Basis	1,220,471
Loans	7,082,959	$ 4,409,642	$ 4,409,642	$ 3,667,511
Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	1,497,137
2019	1,211,412
2018	773,545
2017	600,634
2016	589,607
Prior	764,683
Revolving Loans Amortized Cost Basis	1,149,198
Loans	6,586,216		4,143,116
Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	16,627
2019	24,396
2018	56,256
2017	78,586
2016	47,801
Prior	90,980
Revolving Loans Amortized Cost Basis	49,874
Loans	364,520		186,180
Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	3,628
2019	9,991
2018	22,984
2017	16,960
2016	11,053
Prior	43,798
Revolving Loans Amortized Cost Basis	20,659
Loans	129,073		80,346
Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	89
2019	440
2018	586
2017	314
2016	360
Prior	621
Revolving Loans Amortized Cost Basis	740
Loans	3,150
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	341,806
2019	189,148
2018	82,337
2017	64,787
2016	45,070
Prior	46,542
Revolving Loans Amortized Cost Basis	576,432
Loans	1,346,122		1,034,036	867,083
Commercial and industrial | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	335,519
2019	183,905
2018	64,897
2017	56,598
2016	30,641
Prior	40,964
Revolving Loans Amortized Cost Basis	525,885
Loans	1,238,409
Commercial and industrial | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	3,786
2019	2,555
2018	6,213
2017	3,764
2016	7,847
Prior	4,301
Revolving Loans Amortized Cost Basis	39,901
Loans	68,367
Commercial and industrial | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	2,467
2019	2,688
2018	11,227
2017	4,403
2016	6,582
Prior	1,277
Revolving Loans Amortized Cost Basis	10,502
Loans	39,146
Commercial and industrial | Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	34
2019	0
2018	0
2017	22
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	144
Loans	200
Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	462,757
2019	393,683
2018	91,865
2017	54,304
2016	41,636
Prior	65,971
Revolving Loans Amortized Cost Basis	112,004
Loans	1,222,220		551,101	556,051
Construction | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	460,232
2019	387,759
2018	78,319
2017	40,777
2016	40,386
Prior	59,344
Revolving Loans Amortized Cost Basis	112,004
Loans	1,178,821
Construction | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	1,952
2019	4,169
2018	10,368
2017	13,386
2016	1,250
Prior	3,559
Revolving Loans Amortized Cost Basis	0
Loans	34,684
Construction | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	573
2019	1,755
2018	3,178
2017	129
2016	0
Prior	3,068
Revolving Loans Amortized Cost Basis	0
Loans	8,703
Construction | Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	0
2019	0
2018	0
2017	12
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Loans	12
Residential real estate | 1-to-4 family mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	284,978
2019	179,968
2018	169,514
2017	163,957
2016	115,537
Prior	175,316
Revolving Loans Amortized Cost Basis	0
Loans	1,089,270		710,454	555,815
Residential real estate | 1-to-4 family mortgage | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	282,747
2019	176,374
2018	159,036
2017	147,816
2016	107,911
Prior	152,027
Revolving Loans Amortized Cost Basis	0
Loans	1,025,911
Residential real estate | 1-to-4 family mortgage | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	1,783
2019	2,166
2018	6,672
2017	10,668
2016	4,004
Prior	13,889
Revolving Loans Amortized Cost Basis	0
Loans	39,182
Residential real estate | 1-to-4 family mortgage | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	448
2019	1,422
2018	3,787
2017	5,473
2016	3,418
Prior	9,043
Revolving Loans Amortized Cost Basis	0
Loans	23,591
Residential real estate | 1-to-4 family mortgage | Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	0
2019	6
2018	19
2017	0
2016	204
Prior	357
Revolving Loans Amortized Cost Basis	0
Loans	586
Residential real estate | Residential line of credit
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	408,211
Loans	408,211		221,530	190,480
Residential real estate | Residential line of credit | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	396,348
Loans	396,348
Residential real estate | Residential line of credit | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	6,511
Loans	6,511
Residential real estate | Residential line of credit | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	4,756
Loans	4,756
Residential real estate | Residential line of credit | Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	596
Loans	596
Residential real estate | Multi-family mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	29,006
2019	13,446
2018	11,843
2017	46,561
2016	28,330
Prior	35,396
Revolving Loans Amortized Cost Basis	11,094
Loans	175,676		69,429	75,457
Residential real estate | Multi-family mortgage | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	29,006
2019	13,446
2018	11,843
2017	46,561
2016	28,330
Prior	35,339
Revolving Loans Amortized Cost Basis	11,094
Loans	175,619
Residential real estate | Multi-family mortgage | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Loans	0
Residential real estate | Multi-family mortgage | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	57
Revolving Loans Amortized Cost Basis	0
Loans	57
Residential real estate | Multi-family mortgage | Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Loans	0
Residential real estate | Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	166,962
2019	233,152
2018	350,814
2017	221,149
2016	290,370
Prior	297,712
Revolving Loans Amortized Cost Basis	38,820
Loans	1,598,979
Residential real estate | Non-owner occupied | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	166,962
2019	222,238
2018	324,848
2017	193,496
2016	264,820
Prior	237,933
Revolving Loans Amortized Cost Basis	37,787
Loans	1,448,084
Residential real estate | Non-owner occupied | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	0
2019	8,704
2018	24,464
2017	27,653
2016	25,550
Prior	42,696
Revolving Loans Amortized Cost Basis	1,033
Loans	130,100
Residential real estate | Non-owner occupied | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	0
2019	2,210
2018	1,502
2017	0
2016	0
Prior	17,083
Revolving Loans Amortized Cost Basis	0
Loans	20,795
Residential real estate | Non-owner occupied | Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Loans	0
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	141,915
2019	182,641
2018	104,251
2017	116,906
2016	82,914
Prior	237,800
Revolving Loans Amortized Cost Basis	58,414
Loans	924,841
Commercial real estate | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	133,046
2019	174,965
2018	95,182
2017	89,214
2016	76,539
Prior	208,013
Revolving Loans Amortized Cost Basis	51,264
Loans	828,223
Commercial real estate | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	8,825
2019	5,891
2018	6,646
2017	21,618
2016	6,101
Prior	18,561
Revolving Loans Amortized Cost Basis	2,417
Loans	70,059
Commercial real estate | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	44
2019	1,785
2018	2,423
2017	6,074
2016	274
Prior	11,226
Revolving Loans Amortized Cost Basis	4,733
Loans	26,559
Commercial real estate | Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Loans	0
Commercial real estate | Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	1,598,979		920,744	700,248
Consumer and other
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	90,057
2019	54,201
2018	42,747
2017	28,830
2016	44,964
Prior	41,345
Revolving Loans Amortized Cost Basis	15,496
Loans	317,640		$ 272,078	$ 228,853
Consumer and other | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	89,625
2019	52,725
2018	39,420
2017	26,172
2016	40,980
Prior	31,063
Revolving Loans Amortized Cost Basis	14,816
Loans	294,801
Consumer and other | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	281
2019	911
2018	1,893
2017	1,497
2016	3,049
Prior	7,974
Revolving Loans Amortized Cost Basis	12
Loans	15,617
Consumer and other | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	96
2019	131
2018	867
2017	881
2016	779
Prior	2,044
Revolving Loans Amortized Cost Basis	668
Loans	5,466
Consumer and other | Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
2020	55
2019	434
2018	567
2017	280
2016	156
Prior	264
Revolving Loans Amortized Cost Basis	0
Loans	$ 1,756

Loans and allowance for credi_9

Loans and allowance for credit losses - Credit Quality Indicators by Class of Financing Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			$ 4,352,490
Loans	$ 7,082,959	$ 4,409,642	4,409,642	$ 3,667,511
Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			57,152
Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			4,143,116
Loans	6,586,216		4,143,116
Pass | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			0
Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			142,511
Loans	364,520		186,180
Watch | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			43,669
Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			66,863
Loans	129,073		80,346
Substandard | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			13,483
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			1,032,352
Loans	1,346,122		1,034,036	867,083
Commercial and industrial | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			1,684
Commercial and industrial | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			946,247
Loans	1,238,409
Commercial and industrial | Pass | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			0
Commercial and industrial | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			66,910
Loans	68,367
Commercial and industrial | Watch | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			1,224
Commercial and industrial | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			19,195
Loans	39,146
Commercial and industrial | Substandard | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			460
Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			548,217
Loans	1,222,220		551,101	556,051
Construction | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			2,884
Construction | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			541,201
Loans	1,178,821
Construction | Pass | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			0
Construction | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			4,790
Loans	34,684
Construction | Watch | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			2,681
Construction | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			2,226
Loans	8,703
Construction | Substandard | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			203
Residential real estate | 1-to-4 family mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			691,116
Loans	1,089,270		710,454	555,815
Residential real estate | 1-to-4 family mortgage | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			19,338
Residential real estate | 1-to-4 family mortgage | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			666,177
Loans	1,025,911
Residential real estate | 1-to-4 family mortgage | Pass | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			0
Residential real estate | 1-to-4 family mortgage | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			11,380
Loans	39,182
Residential real estate | 1-to-4 family mortgage | Watch | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			15,091
Residential real estate | 1-to-4 family mortgage | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			13,559
Loans	23,591
Residential real estate | 1-to-4 family mortgage | Substandard | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			4,247
Residential real estate | Residential line of credit
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			221,457
Loans	408,211		221,530	190,480
Residential real estate | Residential line of credit | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			73
Residential real estate | Residential line of credit | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			218,086
Loans	396,348
Residential real estate | Residential line of credit | Pass | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			0
Residential real estate | Residential line of credit | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			1,343
Loans	6,511
Residential real estate | Residential line of credit | Watch | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			0
Residential real estate | Residential line of credit | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			2,028
Loans	4,756
Residential real estate | Residential line of credit | Substandard | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			73
Residential real estate | Multi-family mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			69,429
Loans	175,676		69,429	75,457
Residential real estate | Multi-family mortgage | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			0
Residential real estate | Multi-family mortgage | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			69,366
Loans	175,619
Residential real estate | Multi-family mortgage | Pass | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			0
Residential real estate | Multi-family mortgage | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			63
Loans	0
Residential real estate | Multi-family mortgage | Watch | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			0
Residential real estate | Multi-family mortgage | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			0
Loans	57
Residential real estate | Multi-family mortgage | Substandard | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			0
Residential real estate | Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	1,598,979
Residential real estate | Non-owner occupied | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	1,448,084
Residential real estate | Non-owner occupied | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	130,100
Residential real estate | Non-owner occupied | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	20,795
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	924,841
Commercial real estate | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	828,223
Commercial real estate | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	70,059
Commercial real estate | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	26,559
Commercial real estate | Owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			624,379
Loans	924,841		630,270	493,524
Commercial real estate | Owner occupied | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			5,891
Commercial real estate | Owner occupied | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			576,737
Commercial real estate | Owner occupied | Pass | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			0
Commercial real estate | Owner occupied | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			30,379
Commercial real estate | Owner occupied | Watch | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			4,535
Commercial real estate | Owner occupied | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			17,263
Commercial real estate | Owner occupied | Substandard | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			1,356
Commercial real estate | Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			910,547
Loans	1,598,979		920,744	700,248
Commercial real estate | Non-owner occupied | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			10,197
Commercial real estate | Non-owner occupied | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			876,670
Commercial real estate | Non-owner occupied | Pass | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			0
Commercial real estate | Non-owner occupied | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			24,342
Commercial real estate | Non-owner occupied | Watch | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			6,617
Commercial real estate | Non-owner occupied | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			9,535
Commercial real estate | Non-owner occupied | Substandard | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			3,580
Consumer and other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			254,993
Loans	317,640		272,078	$ 228,853
Consumer and other | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			17,085
Consumer and other | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			248,632
Loans	294,801
Consumer and other | Pass | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			0
Consumer and other | Watch
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			3,304
Loans	15,617
Consumer and other | Watch | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			13,521
Consumer and other | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans, excluding purchased credit impaired loans			3,057
Loans	$ 5,466
Consumer and other | Substandard | Purchased Credit Impaired loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans			$ 3,564

Loans and allowance for cred_10

Loans and allowance for credit losses - Analysis of Aging by Class of Financing Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
30-89 days past due	$ 26,995		$ 18,477
90 days or  more and accruing interest	13,696		5,543
Non-accrual loans	50,760		21,062
Loans current on payments and accruing interest	6,991,508		4,307,408
Loans	7,082,959	$ 4,409,642	4,409,642	$ 3,667,511
Purchased Credit Impaired loans
Financing Receivable, Past Due [Line Items]
Loans current on payments and accruing interest			57,152
Loans			57,152
Commercial and industrial
Financing Receivable, Past Due [Line Items]
30-89 days past due	3,297		1,918
90 days or  more and accruing interest	330		291
Non-accrual loans	16,005		5,587
Loans current on payments and accruing interest	1,326,490		1,024,556
Loans	1,346,122		1,034,036	867,083
Commercial and industrial | Purchased Credit Impaired loans
Financing Receivable, Past Due [Line Items]
Loans current on payments and accruing interest			1,684
Loans			1,684
Construction
Financing Receivable, Past Due [Line Items]
30-89 days past due	7,607		1,021
90 days or  more and accruing interest	573		42
Non-accrual loans	4,053		1,087
Loans current on payments and accruing interest	1,209,987		546,067
Loans	1,222,220		551,101	556,051
Construction | Purchased Credit Impaired loans
Financing Receivable, Past Due [Line Items]
Loans current on payments and accruing interest			2,884
Loans			2,884
Residential real estate | 1-to-4 family mortgage
Financing Receivable, Past Due [Line Items]
30-89 days past due	7,058		10,738
90 days or  more and accruing interest	10,470		3,965
Non-accrual loans	5,923		3,332
Loans current on payments and accruing interest	1,065,819		673,081
Loans	1,089,270		710,454	555,815
Residential real estate | 1-to-4 family mortgage | Purchased Credit Impaired loans
Financing Receivable, Past Due [Line Items]
Loans current on payments and accruing interest			19,338
Loans			19,338
Residential real estate | Residential line of credit
Financing Receivable, Past Due [Line Items]
30-89 days past due	3,551		658
90 days or  more and accruing interest	239		412
Non-accrual loans	1,757		416
Loans current on payments and accruing interest	402,664		219,971
Loans	408,211		221,530	190,480
Residential real estate | Residential line of credit | Purchased Credit Impaired loans
Financing Receivable, Past Due [Line Items]
Loans current on payments and accruing interest			73
Loans			73
Residential real estate | Multi-family mortgage
Financing Receivable, Past Due [Line Items]
30-89 days past due	0		63
90 days or  more and accruing interest	57		0
Non-accrual loans	0		0
Loans current on payments and accruing interest	175,619		69,366
Loans	175,676		69,429	75,457
Residential real estate | Multi-family mortgage | Purchased Credit Impaired loans
Financing Receivable, Past Due [Line Items]
Loans current on payments and accruing interest			0
Loans			0
Residential real estate | Non-owner occupied
Financing Receivable, Past Due [Line Items]
Loans	1,598,979
Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans	924,841
Commercial real estate | Owner occupied
Financing Receivable, Past Due [Line Items]
30-89 days past due	98		1,375
90 days or  more and accruing interest	0		0
Non-accrual loans	7,948		1,793
Loans current on payments and accruing interest	916,795		621,211
Loans	924,841		630,270	493,524
Commercial real estate | Owner occupied | Purchased Credit Impaired loans
Financing Receivable, Past Due [Line Items]
Loans current on payments and accruing interest			5,891
Loans			5,891
Commercial real estate | Non-owner occupied
Financing Receivable, Past Due [Line Items]
30-89 days past due	915		327
90 days or  more and accruing interest	0		0
Non-accrual loans	12,471		7,880
Loans current on payments and accruing interest	1,585,593		902,340
Loans	1,598,979		920,744	700,248
Commercial real estate | Non-owner occupied | Purchased Credit Impaired loans
Financing Receivable, Past Due [Line Items]
Loans current on payments and accruing interest			10,197
Loans			10,197
Consumer and other
Financing Receivable, Past Due [Line Items]
30-89 days past due	4,469		2,377
90 days or  more and accruing interest	2,027		833
Non-accrual loans	2,603		967
Loans current on payments and accruing interest	308,541		250,816
Loans	$ 317,640		272,078	$ 228,853
Consumer and other | Purchased Credit Impaired loans
Financing Receivable, Past Due [Line Items]
Loans current on payments and accruing interest			17,085
Loans			$ 17,085

Loans and allowance for cred_11

Loans and allowance for credit losses - Amortized Cost, Related Allowance and Interest Income of Non-accrual Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Beginning of period non-accrual amortized cost		$ 25,282
Non-accrual with no related allowance	$ 32,661
Non-accrual with related allowance	18,099
Related allowance	2,550
Year to date Interest Income	816
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Beginning of period non-accrual amortized cost		5,586
Non-accrual with no related allowance	13,960
Non-accrual with related allowance	2,045
Related allowance	383
Year to date Interest Income	325
Construction
Financing Receivable, Past Due [Line Items]
Beginning of period non-accrual amortized cost		1,254
Non-accrual with no related allowance	3,061
Non-accrual with related allowance	992
Related allowance	131
Year to date Interest Income	69
Residential real estate | 1-to-4 family mortgage
Financing Receivable, Past Due [Line Items]
Beginning of period non-accrual amortized cost		4,585
Non-accrual with no related allowance	3,048
Non-accrual with related allowance	2,875
Related allowance	84
Year to date Interest Income	22
Residential real estate | Residential line of credit
Financing Receivable, Past Due [Line Items]
Beginning of period non-accrual amortized cost		489
Non-accrual with no related allowance	854
Non-accrual with related allowance	903
Related allowance	31
Year to date Interest Income	72
Commercial real estate | Owner occupied
Financing Receivable, Past Due [Line Items]
Beginning of period non-accrual amortized cost		2,285
Non-accrual with no related allowance	7,172
Non-accrual with related allowance	776
Related allowance	63
Year to date Interest Income	89
Commercial real estate | Non-owner occupied
Financing Receivable, Past Due [Line Items]
Beginning of period non-accrual amortized cost		9,460
Non-accrual with no related allowance	4,566
Non-accrual with related allowance	7,905
Related allowance	1,711
Year to date Interest Income	215
Consumer and other
Financing Receivable, Past Due [Line Items]
Beginning of period non-accrual amortized cost		$ 1,623
Non-accrual with no related allowance	0
Non-accrual with related allowance	2,603
Related allowance	147
Year to date Interest Income	$ 24

Loans and allowance for cred_12

Loans and allowance for credit losses - Impaired Loans Segregated by Class (Details) $ in Thousands	Dec. 31, 2019USD ($)
Recorded investment
With a related allowance recorded	$ 14,126
With no related allowance recorded	9,684
Total impaired loans	23,810
Unpaid principal
With a related allowance recorded	16,881
With no related allowance recorded	11,759
Total impaired loans	28,640
Related allowance	895
Commercial and industrial
Recorded investment
With a related allowance recorded	6,080
With no related allowance recorded	2,946
Unpaid principal
With a related allowance recorded	8,350
With no related allowance recorded	3,074
Related allowance	241
Construction
Recorded investment
With no related allowance recorded	2,061
Unpaid principal
With no related allowance recorded	2,499
Residential real estate | 1-to-4 family mortgage
Recorded investment
With a related allowance recorded	264
With no related allowance recorded	1,083
Unpaid principal
With a related allowance recorded	324
With no related allowance recorded	1,449
Related allowance	8
Residential real estate | Residential line of credit
Recorded investment
With a related allowance recorded	320
With no related allowance recorded	259
Unpaid principal
With a related allowance recorded	320
With no related allowance recorded	280
Related allowance	9
Commercial real estate | Owner occupied
Recorded investment
With a related allowance recorded	756
With no related allowance recorded	2,237
Unpaid principal
With a related allowance recorded	1,140
With no related allowance recorded	2,627
Related allowance	238
Commercial real estate | Non-owner occupied
Recorded investment
With a related allowance recorded	6,706
With no related allowance recorded	1,049
Unpaid principal
With a related allowance recorded	6,747
With no related allowance recorded	1,781
Related allowance	399
Consumer and other
Recorded investment
With no related allowance recorded	49
Unpaid principal
With no related allowance recorded	$ 49

Loans and allowance for cred_13

Loans and allowance for credit losses - Impaired Loans Average Recorded Investment and Interest Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Average recorded investment
With a related allowance recorded	$ 10,568	$ 4,122
With no related allowance recorded	8,197	7,423
Total impaired loans	18,765	11,545
Interest income recognized (cash basis)
With a related allowance recorded	624	175
With no related allowance recorded	575	418
Total impaired loans	1,199	593
Commercial and industrial
Average recorded investment
With a related allowance recorded	3,349	335
With no related allowance recorded	2,088	1,377
Interest income recognized (cash basis)
With a related allowance recorded	474	121
With no related allowance recorded	201	70
Construction
Average recorded investment
With no related allowance recorded	1,641	1,255
Interest income recognized (cash basis)
With no related allowance recorded	167	74
Residential real estate | 1-to-4 family mortgage
Average recorded investment
With a related allowance recorded	205	170
With no related allowance recorded	963	955
Interest income recognized (cash basis)
With a related allowance recorded	13	9
With no related allowance recorded	68	74
Residential real estate | Residential line of credit
Average recorded investment
With no related allowance recorded	252	123
Interest income recognized (cash basis)
With no related allowance recorded	1	15
Commercial real estate | Owner occupied
Average recorded investment
With a related allowance recorded	658	702
With no related allowance recorded	2,143	1,862
Interest income recognized (cash basis)
With a related allowance recorded	27	43
With no related allowance recorded	133	148
Commercial real estate | Non-owner occupied
Average recorded investment
With a related allowance recorded	6,196	2,915
With no related allowance recorded	1,049	1,313
Interest income recognized (cash basis)
With a related allowance recorded	109	2
With no related allowance recorded	0	7
Consumer and other
Average recorded investment
With a related allowance recorded	0	0
With no related allowance recorded	61	49
Interest income recognized (cash basis)
With a related allowance recorded	0	0
With no related allowance recorded	$ 5	$ 4

Loans and allowance for cred_14

Loans and allowance for credit losses - Changes in Value of Accretable Yield for PCI Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretion	$ 3,788	$ 8,556	$ 7,608
PCI Loans
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at the beginning of period	$ (11,050)	(16,587)	(17,682)
Additions through business combinations		(1,167)	0
Principal reductions and other reclassifications from nonaccretable difference		61	(4,047)
Accretion		7,003	9,010
Changes in expected cash flows		(360)	(3,868)
Balance at end of period		$ (11,050)	$ (16,587)

Loans and allowance for cred_15

Loans and allowance for credit losses - Financial Effect of TDRs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)loan	Dec. 31, 2019USD ($)loan	Dec. 31, 2018USD ($)loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | loan	18	12	9
Pre-modification outstanding recorded investment	$ 9,516	$ 7,657	$ 1,340
Post-modification outstanding recorded investment	9,516	7,658	1,340
Charge offs and specific reserves	$ 0	$ 115	$ 0
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | loan	5	3	2
Pre-modification outstanding recorded investment	$ 2,257	$ 3,204	$ 887
Post-modification outstanding recorded investment	2,257	3,204	887
Charge offs and specific reserves	$ 0	$ 0	$ 0
Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | loan		2
Pre-modification outstanding recorded investment		$ 1,085
Post-modification outstanding recorded investment		1,085
Charge offs and specific reserves		$ 0
Commercial real estate: | Owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | loan	7	2	1
Pre-modification outstanding recorded investment	$ 2,794	$ 1,494	$ 143
Post-modification outstanding recorded investment	2,794	1,495	143
Charge offs and specific reserves	$ 0	$ 0	$ 0
Commercial real estate: | Non-owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | loan	2	1
Pre-modification outstanding recorded investment	$ 3,752	$ 1,366
Post-modification outstanding recorded investment	3,752	1,366
Charge offs and specific reserves	$ 0	$ 106
Residential real estate | 1-to-4 family mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | loan	3	2	1
Pre-modification outstanding recorded investment	$ 618	$ 175	$ 249
Post-modification outstanding recorded investment	618	175	249
Charge offs and specific reserves	$ 0	$ 0	$ 0
Residential line of credit
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | loan	1	2
Pre-modification outstanding recorded investment	$ 95	$ 333
Post-modification outstanding recorded investment	95	333
Charge offs and specific reserves	$ 0	$ 9
Consumer and other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | loan			5
Pre-modification outstanding recorded investment			$ 61
Post-modification outstanding recorded investment			61
Charge offs and specific reserves			$ 0

Loans and allowance for cred_16

Loans and allowance for credit losses - Individually Assessed Allowance for Credit Losses for Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	$ 170,389	$ 31,139	$ 31,139	$ 28,932	$ 24,041
Individually assessed allowance for credit loss	2,039		895	268
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	14,748		4,805	5,348	4,461
Individually assessed allowance for credit loss	373		241	3
Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	58,477		10,194	9,729	7,135
Individually assessed allowance for credit loss	95		0	0
Residential real estate | 1-to-4 family mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	19,220		3,112	3,428	3,197
Individually assessed allowance for credit loss	0		8	7
Residential real estate | Residential line of credit
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	10,534		752	811	944
Individually assessed allowance for credit loss	9		9	0
Residential real estate | Multi-family mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	7,174		544	566	434
Individually assessed allowance for credit loss	0		0	0
Commercial real estate | Owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	4,849		4,109	3,132	3,558
Individually assessed allowance for credit loss	30		238	53
Commercial real estate | Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	44,147		4,621	4,149	2,817
Individually assessed allowance for credit loss	1,531		399	205
Consumer and other
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	11,240		3,002	1,769	$ 1,495
Individually assessed allowance for credit loss	1		$ 0	$ 0
Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	16,832
Real Estate | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	0
Real Estate | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	3,877
Real Estate | Residential real estate | 1-to-4 family mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	226
Real Estate | Residential real estate | Residential line of credit
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	1,174
Real Estate | Residential real estate | Multi-family mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	0
Real Estate | Commercial real estate | Owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	3,391
Real Estate | Commercial real estate | Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	8,164
Real Estate | Consumer and other
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	0
Financial Assets and Equipment
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	1,728
Financial Assets and Equipment | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	1,728
Financial Assets and Equipment | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	0
Financial Assets and Equipment | Residential real estate | 1-to-4 family mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	0
Financial Assets and Equipment | Residential real estate | Residential line of credit
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	0
Financial Assets and Equipment | Residential real estate | Multi-family mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	0
Financial Assets and Equipment | Commercial real estate | Owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	0
Financial Assets and Equipment | Commercial real estate | Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	0
Financial Assets and Equipment | Consumer and other
Financing Receivable, Allowance for Credit Loss [Line Items]
Type of Collateral	0
Collateral Pledged
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually assessed allowance for credit loss	1,687
Collateral Pledged | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually assessed allowance for credit loss	117
Collateral Pledged | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually assessed allowance for credit loss	0
Collateral Pledged | Residential real estate | 1-to-4 family mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually assessed allowance for credit loss	0
Collateral Pledged | Residential real estate | Residential line of credit
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually assessed allowance for credit loss	9
Collateral Pledged | Residential real estate | Multi-family mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually assessed allowance for credit loss	0
Collateral Pledged | Commercial real estate | Owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually assessed allowance for credit loss	30
Collateral Pledged | Commercial real estate | Non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually assessed allowance for credit loss	1,531
Collateral Pledged | Consumer and other
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually assessed allowance for credit loss	$ 0

Loans and allowance for cred_17

Loans and allowance for credit losses - Deferrals Program (Details) $ in Thousands	Dec. 31, 2020USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Outstanding loans balance	$ 202,517
% of Loans	2.90%
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Outstanding loans balance	$ 7,118
% of Loans	0.50%
Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Outstanding loans balance	$ 1,918
% of Loans	0.20%
Residential real estate | 1-to-4 family mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Outstanding loans balance	$ 19,201
% of Loans	1.80%
Residential real estate | Residential line of credit
Financing Receivable, Troubled Debt Restructuring [Line Items]
Outstanding loans balance	$ 204
% of Loans	0.00%
Residential real estate | Multi-family mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Outstanding loans balance	$ 3,305
% of Loans	1.90%
Commercial real estate | Owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Outstanding loans balance	$ 19,815
% of Loans	2.10%
Commercial real estate | Non-owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Outstanding loans balance	$ 139,590
% of Loans	8.70%
Consumer and other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Outstanding loans balance	$ 11,366
% of Loans	3.60%

Loans held for sale (Details)

Loans held for sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for sale, at fair value	$ 899,173	$ 262,518
Mortgage Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Net gains (losses) from fair value changes of mortgage loans	24,233	(2,861)	$ (4,539)
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Net gains (losses) from fair value changes of mortgage loans	3,228
Loans held for sale, at fair value	215,403	0
Residential real estate | 1-to-4 family mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held for sale, at fair value	$ 683,770	$ 262,518

Premises and equipment - Premis

Premises and equipment - Premises and Equipment and Related Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Finance lease	$ 1,588	$ 0
Premises and equipment and finance lease, gross	206,881	144,761
Less: accumulated depreciation and amortization	(61,766)	(54,630)
Total Premises and Equipment	145,115	90,131
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	33,151	26,283
Premises
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	108,579	65,569
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	26,729	23,545
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	18,429	12,989
Equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	16,904	15,575
Construction in process
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 1,501	$ 800

Premises and equipment - Narrat

Premises and equipment - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Depreciation and amortization	$ 7,009	$ 5,176	$ 4,334

Other real estate owned - Summa

Other real estate owned - Summary of Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Real Estate [Roll Forward]
Balance at beginning of period	$ 18,939	$ 12,643	$ 16,442
Transfers from loans	2,746	5,487	2,138
Transfers (to) from premises and equipment	(841)	4,290	0
Proceeds from sale of other real estate owned	(6,937)	(3,860)	(4,819)
Gain on sale of other real estate owned	354	1,058	271
Loans provided for sales of other real estate owned	(305)	(166)	(1,019)
Write-downs and partial liquidations	(1,845)	(513)	(370)
Balance at end of period	$ 12,111	$ 18,939	$ 12,643

Other real estate owned - Narra

Other real estate owned - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Real Estate Properties [Line Items]
Other real estate owned included excess land and facilities held for sale	$ 5,703	$ 8,956
Residential Real Estate Properties
Real Estate Properties [Line Items]
Foreclosed residential real estate properties	1,890	4,295
Total foreclosure proceedings in process	$ 167	$ 82

Goodwill and intangible asset_2

Goodwill and intangible assets - Goodwill Activity (Details) - USD ($) $ in Thousands	Aug. 15, 2020	Feb. 14, 2020	Dec. 31, 2020	Dec. 31, 2019
Goodwill
Beginning Balance			$ 169,051	$ 137,190
Addition from acquisitions				31,961
Relief of goodwill due to sale of TPO mortgage delivery channel				(100)
Ending Balance			242,561	$ 169,051
Farmers National
Goodwill
Addition from acquisitions		$ 6,319	6,319
Franklin
Goodwill
Addition from acquisitions	$ 67,191		$ 67,191

Goodwill and intangible asset_3

Goodwill and intangible assets - Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 62,523	$ 52,363
Accumulated Amortization	(40,097)	(34,774)
Net Carrying Amount	22,426	17,589
Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	59,835	49,675
Accumulated Amortization	(38,807)	(33,861)
Net Carrying Amount	21,028	15,814
Customer base trust intangible
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,600	1,600
Accumulated Amortization	(547)	(387)
Net Carrying Amount	1,053	1,213
Manufactured housing servicing intangible
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,088	1,088
Accumulated Amortization	(743)	(526)
Net Carrying Amount	$ 345	$ 562

Goodwill and intangible asset_4

Goodwill and intangible assets - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment			$ 0	$ 0
Relief of goodwill related to the sale of the TPO mortgage delivery channel				$ 100,000
Farmers National | Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		$ 2,490,000
Weighted average life of intangible assets acquired		4 years
Franklin Financial Network, Inc. | Core deposit and other intangibles
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 7,670,000
Weighted average life of intangible assets acquired	4 years

Goodwill and intangible asset_5

Goodwill and intangible assets - Estimated Aggregate Future Amortization Expense of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
2021	$ 5,477
2022	4,586
2024	3,658
2025	2,946
2025	2,306
Thereafter	3,453
Net Carrying Amount	$ 22,426	$ 17,589

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)leasebranchlease_renewal_option	Dec. 31, 2018USD ($)	Dec. 31, 2022USD ($)	Dec. 31, 2019USD ($)branch
Lessee, Lease, Description [Line Items]
Lessee, number of operating leases | lease	58
Lessee, number of finance leases | branch	1
Lessee, number of total operating leases, noncurrent | lease	49
Lessee, number of total finance leases, noncurrent | branch	1
Lessee, operating and finance lease, number of options to renew | lease_renewal_option	1
Operating lease right-of-use assets	$ 49,537			$ 32,539
Operating lease liabilities	55,187			35,525
Finance leases	$ 1,588			$ 0
Lease expense		$ 5,019
Amortization of favorable lease intangibles		$ 90
Franklin Financial Network, Inc.
Lessee, Lease, Description [Line Items]
Lessee, number of finance leases | branch	1			0
Operating lease right-of-use assets	$ 23,972
Operating lease liabilities	23,972
Finance leases	$ 1,630
Forecast | Corporate headquarters
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets			$ 29,000
Operating lease liabilities			$ 30,000
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating and finance lease, term of contract	1 year
Lessee, operating and finance lease, renewal term	20 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating and finance lease, term of contract	35 years

Leases - Information Related to

Leases - Information Related to Company's Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating leases	$ 49,537	$ 32,539
Finance leases	1,588	0
Total right-of-use assets	$ 51,125	$ 32,539
Right-of-use asset - finance [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Operating leases	$ 55,187	$ 35,525
Finance leases	1,598	0
Total lease liabilities	$ 56,785	$ 35,525
Lease liabilities - finance [Extensible List]	us-gaap:DebtLongtermAndShorttermCombinedAmount	us-gaap:DebtLongtermAndShorttermCombinedAmount
Weighted average remaining lease term (in years) - operating	12 years 2 months 12 days	14 years 1 month 6 days
Weighted average remaining lease term (in years) - finance	14 years 4 months 24 days	0 years
Weighted average discount rate - operating	2.65%	3.44%
Weighted average discount rate - finance	1.76%	0.00%

Leases - Lease Expense (Details

Leases - Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 6,228	$ 5,057
Short-term lease cost	456	365
Variable lease cost	602	682
Finance lease, interest on lease liabilities	11	0
Finance lease, amortization of right-of-use asset	43	0
Lease impairment	2,142	0
Total lease cost	$ 9,482	$ 6,104

Leases - Maturity Analysis of O

Leases - Maturity Analysis of Operating and Finance Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
December 31, 2021	$ 8,042
December 31, 2022	7,693
December 31, 2023	6,302
December 31, 2024	5,625
December 31, 2025	4,972
Thereafter	34,053
Total undiscounted future minimum lease payments	66,687
Less: imputed interest	(11,500)
Operating leases	55,187	$ 35,525
Finance Leases
December 31, 2021	115
December 31, 2022	116
December 31, 2023	118
December 31, 2024	120
December 31, 2025	121
Thereafter	1,225
Total undiscounted future minimum lease payments	1,815
Less: imputed interest	(217)
Finance leases	$ 1,598	$ 0

Mortgage servicing rights - Cha

Mortgage servicing rights - Changes in Mortgage Servicing Rights (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]
Carrying value at beginning of period	$ 75,521,000	$ 88,829,000	$ 76,107,000
Capitalization	47,025,000	42,151,000	54,913,000
Mortgage servicing rights acquired from Franklin, at fair value	5,111,000	0
Sales	0	(29,160,000)	(39,428,000)
Change in fair value:
Due to pay-offs/pay-downs	(27,834,000)	(16,350,000)	(11,062,000)
Due to change in valuation inputs or assumptions	(19,826,000)	(9,949,000)	8,299,000
Carrying value at end of period	$ 79,997,000	$ 75,521,000	$ 88,829,000

Mortgage servicing rights - Ser

Mortgage servicing rights - Servicing Income and Expense Included in Mortgage Banking Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Servicing income:
Servicing income	$ 22,128	$ 17,677	$ 20,591
Change in fair value of mortgage servicing rights	(47,660)	(26,299)	(2,763)
Change in fair value of derivative hedging instruments	13,286	9,310	(5,910)
Servicing income	(12,246)	688	11,918
Servicing expenses	7,890	6,832	7,675
Net servicing (loss) income	$ (20,136)	$ (6,144)	$ 4,243

Mortgage servicing rights - Dat

Mortgage servicing rights - Data and Key Economic Assumptions Related to Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Transfers and Servicing of Financial Assets [Abstract]
Unpaid principal balance	$ 9,787,657	$ 6,734,496
Weighted-average prepayment speed (CPR)	14.07%	10.05%
Estimated impact on fair value of a 10% increase	$ (4,493)	$ (2,839)
Estimated impact on fair value of a 20% increase	$ (8,599)	$ (5,474)
Discount rate	11.49%	9.68%
Estimated impact on fair value of a 100 bp increase	$ (2,942)	$ (3,086)
Estimated impact on fair value of a 200 bp increase	$ (5,674)	$ (5,932)
Weighted-average coupon interest rate	3.58%	4.20%
Weighted-average servicing fee (basis points)	0.28%	0.29%
Weighted-average remaining maturity (in months)	328 months	335 months

Mortgage servicing rights - Nar

Mortgage servicing rights - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Transfers and Servicing of Financial Assets [Abstract]
Mortgage servicing rights sold	$ 0	$ 29,160,000	$ 39,428,000
Mortgage loans serviced	0	2,034,374,000	$ 3,181,483,000
Mortgage escrow deposit	$ 147,957,000	$ 92,610,000

Other assets and other liabil_3

Other assets and other liabilities - Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Assets And Other Liabilities [Abstract]
Cash surrender value on bank owned life insurance	$ 71,977	$ 11,357
Prepaid expenses	5,328	4,575
Software	1,147	1,999
Mortgage lending receivable	8,716	10,765
Derivatives	68,938	21,981
Deferred tax asset	16,396	0
FHLB lender risk account receivable	12,729	11,225
Pledged collateral on derivative instruments	57,985	33,616
Other assets	30,900	27,196
Other assets	$ 274,116	$ 122,714

Other assets and other liabil_4

Other assets and other liabilities - Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Assets And Other Liabilities [Abstract]
Deferred compensation	$ 2,261	$ 1,718
Accrued payroll	35,827	16,517
Mortgage buyback reserve	5,928	3,529
Accrued interest	6,772	6,465
Derivatives	48,242	17,933
Deferred tax liability	0	20,490
FHLB lender risk account guaranty	6,183	5,546
Reserve for unfunded commitments	16,378	0
Other liabilities	42,809	15,256
Accrued expenses and other liabilities	$ 164,400	$ 87,454

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deposits [Abstract]
Time deposits in denomination of greater than $250	$ 425,227	$ 343,756
Deposits in overdraft status reclassified as loans	$ 2,965	$ 3,487

Deposits - Maturities of Time D

Deposits - Maturities of Time Deposits (Details) $ in Thousands	Dec. 31, 2020USD ($)
Deposits [Abstract]
December 31, 2021	$ 1,048,816
December 31, 2022	204,165
December 31, 2023	117,178
December 31, 2024	44,718
December 31, 2025	22,325
Thereafter	52
Total	$ 1,437,254

Borrowings - Long Term Instrume

Borrowings - Long Term Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Balance	$ 238,324	$ 304,675
Weighted Average Interest Rate	0.47%	0.89%
Securities sold under agreements to repurchase
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Balance	$ 32,199	$ 23,745
Weighted Average Interest Rate	0.47%	0.89%
FHLB advances
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Balance	$ 0	$ 250,000
Weighted Average Interest Rate	0.00%	1.60%
Subordinated debt
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Balance	$ 189,527	$ 30,930
Weighted Average Interest Rate	5.10%	5.13%
Other Borrowings
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Balance	$ 16,598	$ 0
Weighted Average Interest Rate	1.88%	0.00%

Borrowings - Securities Sold Un

Borrowings - Securities Sold Under Agreements to Repurchase (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]
Balance at year end	$ 32,199,000	$ 23,745,000
Average daily balance during the year	$ 32,912,000	$ 22,798,000
Average interest rate during the year	0.61%	0.84%
Maximum month-end balance during the year	$ 40,282,000	$ 30,273,000
Weighted average interest rate at year-end	0.47%	0.89%
Percentage of fair value of securities pledged of the outstanding balance of repurchase agreement	1
Borrowings outstanding under line of credit as federal funds purchased	$ 0	$ 0
Federal Funds Purchased
Assets Sold under Agreements to Repurchase [Line Items]
Line of credit	$ 335,000,000	$ 305,000,000

Borrowings - Federal Home Loan

Borrowings - Federal Home Loan Bank Advances (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Collateral securing line of credit	$ 2,781,606,000	$ 958,506,000
Total borrowing capacity remaining	1,276,095,000	760,607,000
Letter of credit pledged	100,000,000	75,000,000
Borrowings against line of credit	0	$ 250,000,000
Weighted average interest rate on outstanding advances		1.60%
Federal Reserve Bank
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Pledged loans to the Federal Reserve Bank	2,463,281,000	$ 1,407,662,000
Line of credit	1,695,639,000	1,013,239,000
Collateral Pledged
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Securities pledged	804,821,000	373,674,000
Collateral Pledged | Federal Reserve Bank
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Securities pledged	0	4,963,000
FHLB Overnight
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Additional line available	800,000,000	800,000,000
Long Term Advances
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Borrowings against line of credit		150,000,000
90 Day Fixed Rate Advance
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Borrowings against line of credit		$ 100,000,000
Advance term		90 days
FHLB Advance 10 Year
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Borrowings against line of credit		$ 100,000
Advance term		10 years
Early termination costs	$ 6,838,000
FHLB Advance 7 Year
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Borrowings against line of credit		$ 50,000
Advance term		7 years

Borrowings - Subordinated Debt

Borrowings - Subordinated Debt (Details)	Aug. 15, 2020USD ($)issue	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2003USD ($)trust	Mar. 31, 2021USD ($)
Debt Instrument [Line Items]
Issuance of subordinated debt, net of issuance costs		$ 98,228,000	$ 0	$ 0
Net proceeds from sale of common stock under employee stock purchase program		978,000	804,000	$ 1,196,000
Borrowings		238,324,000	304,675,000
Subordinated debt
Debt Instrument [Line Items]
Number of separate trusts | trust					2
Borrowings		30,930,000
Subordinated debt | Franklin Financial Network, Inc.
Debt Instrument [Line Items]
Debt instrument, face amount	$ 60,000,000
Number of issues | issue	2
Fair value premium adjustment		369,000
Borrowings		60,369,000
Subordinated debt | Minimum | Franklin Financial Network, Inc.
Debt Instrument [Line Items]
Debt instrument, interest rate, phase two period	6 years
Subordinated debt | Maximum | Franklin Financial Network, Inc.
Debt Instrument [Line Items]
Debt instrument, interest rate, phase two period	10 years
Subordinated debt | Floating Rate Trust Preferred Securities Trust
Debt Instrument [Line Items]
Preferred securities issued to form the trust		$ 30,000,000	$ 30,000,000
Distribution payment period of occurrence of a special event		120 days
Subordinated debt | Floating Rate Trust Preferred Securities Trust I
Debt Instrument [Line Items]
Preferred securities issued to form the trust					$ 9,000,000
Issuance of subordinated debt, net of issuance costs					9,280,000
Net proceeds from sale of common stock under employee stock purchase program					$ 280,000
Debt instrument, interest rate		3.50%	5.19%
Subordinated debt | Floating Rate Trust Preferred Securities Trust I | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on debt variable rate					3.25%
Subordinated debt | Floating Rate Trust Preferred Securities Trust II
Debt Instrument [Line Items]
Preferred securities issued to form the trust					$ 21,000,000
Issuance of subordinated debt, net of issuance costs					21,650,000
Net proceeds from sale of common stock under employee stock purchase program					$ 650,000
Debt instrument, interest rate		3.40%	5.10%
Subordinated debt | Floating Rate Trust Preferred Securities Trust II | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on debt variable rate					3.15%
Subordinated debt | Fixed To Floating Rate Note
Debt Instrument [Line Items]
Basis spread on debt variable rate		4.39%
Debt instrument, interest rate		4.50%
Debt instrument, face amount		$ 100,000,000
Long-term debt, term		10 years
Debt instrument, interest rate, phase one period		5 years
Unamortized debt issuance costs		$ 1,772,000
Percentage of tier 2 capital treatment lost		20.00%
Period for loss of tier 2 capital treatment		5 years
Subordinated debt | Fixed To Floating Rate Note | Minimum
Debt Instrument [Line Items]
Debt instrument, interest rate, phase two period		6 years
Subordinated debt | Fixed To Floating Rate Note | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate, phase two period		10 years
Subordinated debt | March 2026 Subordinated Notes | Franklin Financial Network, Inc.
Debt Instrument [Line Items]
Preferred securities issued to form the trust	$ 40,000,000
Debt instrument, interest rate	6.875%
Subordinated debt | March 2026 Subordinated Notes | Franklin Financial Network, Inc. | Subsequent Event | Forecast
Debt Instrument [Line Items]
Debt redemption amount						$ 40,000,000
Subordinated debt | March 2026 Subordinated Notes | London Interbank Offered Rate (LIBOR) | Franklin Financial Network, Inc.
Debt Instrument [Line Items]
Basis spread on debt variable rate	5.636%
Subordinated debt | July 2026 Subordinated Notes | Franklin Financial Network, Inc.
Debt Instrument [Line Items]
Preferred securities issued to form the trust	$ 20,000
Debt instrument, interest rate	7.00%
Subordinated debt | July 2026 Subordinated Notes | London Interbank Offered Rate (LIBOR) | Franklin Financial Network, Inc.
Debt Instrument [Line Items]
Basis spread on debt variable rate	6.04%

Borrowings - Other Borrowings (

Borrowings - Other Borrowings (Details)	12 Months Ended
	Dec. 31, 2020USD ($)
Debt Instrument [Line Items]
Remaining amount available under credit line	$ 5,000,000
Line of Credit
Debt Instrument [Line Items]
Credit line	20,000,000
Amount borrowed from credit line	$ 15,000,000
Credit line term	1 year
Line of Credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on debt variable rate	1.75%

Income taxes - Allocation of Fe

Income taxes - Allocation of Federal and State Income Taxes between Current and Deferred Portions (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Current									$ 44,362	$ 27,641	$ 19,259
Provision for deferred income taxes									(25,530)	(1,916)	6,359
Total	$ 13,337	$ (2,040)	$ 7,455	$ 80	$ 5,718	$ 7,718	$ 6,314	$ 5,975	$ 18,832	$ 25,725	$ 25,618

Income taxes - Reconciliation o

Income taxes - Reconciliation of Income Taxes Computed at the United States Federal Statutory Tax Rates to the Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal taxes calculated at statutory rate, amount									$ 17,317	$ 23,003	$ 22,230
Amount increase (decrease) resulting from:
State taxes, net of federal benefit									3,197	4,792	4,666
Expense (benefit) from equity based compensation									153	(1,353)	(870)
Municipal interest income, net of interest disallowance									(1,507)	(908)	(837)
Bank owned life insurance									(327)	(51)	(51)
Merger costs									289	66	141
Other									(290)	176	339
Total	$ 13,337	$ (2,040)	$ 7,455	$ 80	$ 5,718	$ 7,718	$ 6,314	$ 5,975	$ 18,832	$ 25,725	$ 25,618
Federal taxes calculated at statutory rate, percent									21.00%	21.00%	21.00%
Percentage increase (decrease) resulting from:
State taxes, net of federal benefit									3.90%	4.40%	4.40%
Expense (benefit) from equity based compensation									0.20%	(1.20%)	(0.80%)
Municipal interest income, net of interest disallowance									(1.80%)	(0.80%)	(0.80%)
Bank owned life insurance									(0.40%)	(0.10%)	0.00%
Merger costs									0.40%	0.10%	0.10%
Other									(0.40%)	0.10%	0.30%
Total									22.90%	23.50%	24.20%

Income taxes - Narrative (Detai

Income taxes - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Acquired net operating losses	$ 1,753	$ 0
Franklin Financial Network, Inc.
Business Acquisition [Line Items]
Acquired net operating losses	$ 8,346

Income taxes - Schedule of Net

Income taxes - Schedule of Net Deferred Tax Assets (Liability) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Deferred tax assets:
Allowance for credit losses	$ 48,409		$ 8,113
Operating lease liabilities	14,496		9,373
Federal net operating loss	1,753		0
Amortization of core deposit intangibles	0		1,386
Deferred compensation	8,872		5,231
Unrealized loss on debt securities	0		54
Unrealized loss on equity securities	0		60
Unrealized loss on cash flow hedges	499		0
Other	19,101		2,388
Subtotal	93,130		26,605
Deferred tax liabilities:
FHLB stock dividends	(561)		(550)
Operating leases - right of use assets	(13,197)		(8,641)
Depreciation	(7,491)		(5,078)
Amortization of core deposit intangibles	(684)		0
Unrealized gain on equity securities	(17)		0
Unrealized gain on cash flow hedges	0		(203)
Unrealized gain on debt securities	(13,027)		(3,051)
Mortgage servicing rights	(20,803)		(19,678)
Goodwill	(11,301)		(8,859)
Other	(9,653)		(1,035)
Subtotal	(76,734)		(47,095)
Net deferred tax assets (liabilities)	$ 16,396
Net deferred tax assets (liabilities)		$ (20,490)	$ (20,490)

Dividend restrictions (Details)

Dividend restrictions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Amount available for payment of dividend without prior approval	$ 185,703,000	$ 223,730,000
Cash dividends	48,750,000	$ 0	$ 0
Security dividends	$ 956,000

Commitments and contingencies -

Commitments and contingencies - Financial Instruments with Off-Balance Sheet Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Balance at end of period	$ 2,787,594	$ 1,105,742
Commitments to extend credit, excluding interest rate lock commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Balance at end of period	2,719,996	1,086,173
Letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Balance at end of period	$ 67,598	$ 19,569

Commitments and contingencies_2

Commitments and contingencies -Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020	Dec. 31, 2017
Loss Contingencies [Line Items]
Fixed rate loan commitments	$ 1,070,000
Floating rate loan commitments	1,650,000
Cumulative effect adjustment of adoption of accounting principle	(1,291,382)	$ (762,329)	$ (671,857)
Total principal amount of loans repurchased or indemnified	9,171	6,475	6,646
Cumulative effect of change in accounting principle
Loss Contingencies [Line Items]
Cumulative effect adjustment of adoption of accounting principle		25,018	1,309		$ 0
Unfunded Commitments
Loss Contingencies [Line Items]
Impact of CECL adoption on provision for credit losses on unfunded commitments				$ 2,947
Retained earnings
Loss Contingencies [Line Items]
Cumulative effect adjustment of adoption of accounting principle	$ (317,625)	$ (293,524)	(221,213)
Retained earnings | Cumulative effect of change in accounting principle
Loss Contingencies [Line Items]
Cumulative effect adjustment of adoption of accounting principle			$ 1,309	$ 25,018	$ 109

Commitments and contingencies_3

Commitments and contingencies - Allowance for Credit Losses on Unfunded Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Jan. 01, 2020
Commitments and Contingencies [Roll Forward]
Balance at beginning of period	$ 31,139
Balance at end of period	170,389
Unfunded Commitments
Commitments and Contingencies [Roll Forward]
Balance at beginning of period	0
Impact of CECL adoption on provision for credit losses on unfunded commitments		$ 2,947
Increase in provision for credit losses from unfunded commitments acquired in business combination	10,499
Provision for credit losses on unfunded commitments	2,932
Balance at end of period	$ 16,378

Commitments and contingencies_4

Commitments and contingencies - Activity in the Repurchase Reserve (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Commitments and Contingencies [Roll Forward]
Balance at beginning of period	$ 3,529	$ 3,273	$ 3,386
Provision for loan repurchases or indemnifications	2,607	362	174
Recoveries on previous losses	(208)	(106)	3
Losses on loans repurchased or indemnified	0	0	(290)
Balance at end of period	$ 5,928	$ 3,529	$ 3,273

Derivatives - Narrative (Detail

Derivatives - Narrative (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2017USD ($)derivative	Mar. 31, 2018USD ($)	Dec. 31, 2020USD ($)derivative	Dec. 31, 2019USD ($)
Derivative [Line Items]
Notional Amount	$ 100,000,000
Borrowings			$ 238,324,000	$ 304,675,000
Stockholders' equity			1,291,289,000	762,329,000
Cash collateral pledged on derivatives			57,985,000	33,616,000
Net liability position			$ 0	0
Minimum
Derivative [Line Items]
Period to lock interest rate on mortgage loan commitments			45 days
Maximum
Derivative [Line Items]
Period to lock interest rate on mortgage loan commitments			90 days
Subordinated debt
Derivative [Line Items]
Number of derivative instruments | derivative			2
Borrowings			$ 30,930,000
Interest rate swaps
Derivative [Line Items]
Number of derivative instruments | derivative	3
Interest rate swaps | Designated as hedging:
Derivative [Line Items]
Notional Amount			30,000,000	30,000,000
Interest rate swaps | Subordinated debt
Derivative [Line Items]
Notional Amount			30,000,000
Fair value of contract liability balances of interest rate swaps			$ 1,909,000	515,000
Interest rate swaps three years
Derivative [Line Items]
Notional Amount	$ 30,000,000
Derivative notional amount maturity period	3 years
Interest rate swaps four years
Derivative [Line Items]
Notional Amount	$ 35,000,000
Derivative notional amount maturity period	4 years
Interest rate swaps five years
Derivative [Line Items]
Notional Amount	$ 35,000,000
Derivative notional amount maturity period	5 years
Gain on canceled derivatives		$ 1,564,000
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Derivative [Line Items]
Stockholders' equity				$ 955,000
London Interbank Offered Rate (LIBOR) | Interest rate swaps | Subordinated debt
Derivative [Line Items]
Variable interest rate			2.08%

Derivatives - Derivative Financ

Derivatives - Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jul. 31, 2017
Derivatives, Fair Value [Line Items]
Notional Amount			$ 100,000
Asset	$ 68,938	$ 21,981
Liability	48,242	17,933
Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	3,532,227	1,967,191
Asset	68,938	21,981
Liability	46,333	17,418
Interest rate contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	606,878	440,556
Asset	34,547	14,929
Liability	34,317	14,929
Forward commitments | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	1,358,328	684,437
Asset	0	0
Liability	11,633	866
Interest rate-lock commitments | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	1,191,621	453,198
Asset	34,391	7,052
Liability	0	0
Futures contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	375,400	389,000
Asset	0	0
Liability	383	1,623
Interest rate swaps | Designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	30,000	30,000
Asset	0	0
Liability	$ 1,909	$ 515

Derivatives - Gains (Losses) In

Derivatives - Gains (Losses) Included in the Consolidated Statements of Income Related to Derivative Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Reclassification adjustment for gain on hedging activities, tax	$ 337	$ 170	$ 45
Amount of (loss) gain recognized in other comprehensive income	(1,031)	(914)	1,039
(Loss) gain recognized in other comprehensive income, expense (benefit), tax	363	322	(366)
Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(37,543)	3,288	298
Designated as hedging:
Derivatives, Fair Value [Line Items]
Total cash flow hedge gain (loss) and derivative excluded component increase (decrease)	602	596	160
Designated as hedging: | Interest Expense on Borrowings
Derivatives, Fair Value [Line Items]
Amount of gain (loss) reclassified from other comprehensive income and recognized in interest expense on borrowings	955	481	128
(Loss) gain included in interest expense on borrowings	(353)	115	32
Interest rate-lock commitments | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	27,339	(2,112)	(527)
Forward commitments | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(73,033)	12,170	3,864
Futures contracts | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	8,151	(6,723)	(2,981)
Option contracts | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ 0	$ (47)	$ (58)

Derivatives - Offsetting Deriva

Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Offsetting Derivative Assets
Gross amounts recognized	$ 3,863,000	$ 331,000
Gross amounts offset in the consolidated balance sheets	0	0
Net amounts presented in the consolidated balance sheets	3,863,000	331,000
Gross amounts not offset in the consolidated balance sheets, less financial instruments	857,000	139,000
Gross amounts not offset in the consolidated balance sheets, less financial collateral pledged	0	0
Net amounts	3,006,000	192,000
Offsetting Derivative Liabilities
Gross amounts recognized	34,051,000	14,682,000
Gross amounts offset in the consolidated balance sheets	0	0
Net amounts presented in the consolidated balance sheets	34,051,000	14,682,000
Gross amounts not offset in the consolidated balance sheets, less financial instruments	857,000	139,000
Gross amounts not offset in the consolidated balance sheets, less financial collateral pledged	33,194,000	14,543,000
Net amounts	$ 0	$ 0

Fair value of financial instr_3

Fair value of financial instruments - Estimated Fair Values and Carrying Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial assets:
Interest receivable	$ 43,603	$ 17,083
Derivatives	68,938	21,981
Financial liabilities:
Derivatives	48,242	17,933
Level 1
Financial assets:
Cash and cash equivalents	1,317,898	232,681
Investment securities	0	0
Loans, net	0	0
Loans held for sale	0	0
Interest receivable	33	0
Mortgage servicing rights	0	0
Derivatives	0	0
Financial liabilities:
Deposits, Without stated maturities	8,020,783	3,743,085
Deposits, With stated maturities	0	0
Securities sold under agreement to repurchase and federal funds sold	32,199	23,745
Federal Home Loan Bank advances		0
Subordinated debt	0	0
Other borrowings	0
Interest payable	327	376
Derivatives	0	0
Level 2
Financial assets:
Cash and cash equivalents	0	0
Investment securities	1,176,991	691,676
Loans, net	0	0
Loans held for sale	683,770	262,518
Interest receivable	5,254	3,282
Mortgage servicing rights	0	0
Derivatives	68,938	21,981
Financial liabilities:
Deposits, Without stated maturities	0	0
Deposits, With stated maturities	1,446,605	1,200,145
Securities sold under agreement to repurchase and federal funds sold	0	0
Federal Home Loan Bank advances		250,213
Subordinated debt	0	29,706
Other borrowings	16,598
Interest payable	4,210	6,089
Derivatives	48,242	17,933
Level 3
Financial assets:
Cash and cash equivalents	0	0
Investment securities	0	0
Loans, net	7,058,693	4,363,903
Loans held for sale	215,403	0
Interest receivable	38,316	13,801
Mortgage servicing rights	79,997	75,521
Derivatives	0	0
Financial liabilities:
Deposits, Without stated maturities	0	0
Deposits, With stated maturities	0	0
Securities sold under agreement to repurchase and federal funds sold	0	0
Federal Home Loan Bank advances		0
Subordinated debt	192,149	0
Other borrowings	0
Interest payable	2,235	0
Derivatives	0	0
Carrying amount
Financial assets:
Cash and cash equivalents	1,317,898	232,681
Investment securities	1,176,991	691,676
Loans, net	6,912,570	4,378,503
Loans held for sale	899,173	262,518
Interest receivable	43,603	17,083
Mortgage servicing rights	79,997	75,521
Derivatives	68,938	21,981
Financial liabilities:
Deposits, Without stated maturities	8,020,783	3,743,085
Deposits, With stated maturities	1,437,254	1,191,853
Securities sold under agreement to repurchase and federal funds sold	32,199	23,745
Federal Home Loan Bank advances		250,000
Subordinated debt	189,527	30,930
Other borrowings	16,598
Interest payable	6,772	6,465
Derivatives	48,242	17,933
Aggregate fair value
Financial assets:
Cash and cash equivalents	1,317,898	232,681
Investment securities	1,176,991	691,676
Loans, net	7,058,693	4,363,903
Loans held for sale	899,173	262,518
Interest receivable	43,603	17,083
Mortgage servicing rights	79,997	75,521
Derivatives	68,938	21,981
Financial liabilities:
Deposits, Without stated maturities	8,020,783	3,743,085
Deposits, With stated maturities	1,446,605	1,200,145
Securities sold under agreement to repurchase and federal funds sold	32,199	23,745
Federal Home Loan Bank advances		250,213
Subordinated debt	192,149	29,706
Other borrowings	16,598
Interest payable	6,772	6,465
Derivatives	$ 48,242	$ 17,933

Fair value of financial instr_4

Fair value of financial instruments - Balances and Levels of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial assets:
Available-for-sale debt securities, at fair value	$ 1,172,400	$ 688,381
Equity securities, at fair value	4,591	3,295
Derivatives	68,938	21,981
Financial liabilities:
Derivatives	48,242	17,933
Mortgage-backed securities - residential
Financial assets:
Available-for-sale debt securities, at fair value	773,336	477,312
Mortgage-backed securities - commercial
Financial assets:
Available-for-sale debt securities, at fair value	21,588	13,364
U.S. Treasury securities
Financial assets:
Available-for-sale debt securities, at fair value	16,628	7,448
Corporate securities
Financial assets:
Available-for-sale debt securities, at fair value	2,516	1,022
Quoted prices in active markets for identical assets (liabilities) (level 1)
Financial assets:
Investment securities	0	0
Loans held for sale	0	0
Mortgage servicing rights	0	0
Derivatives	0	0
Financial liabilities:
Derivatives	0	0
Significant other observable inputs (level 2)
Financial assets:
Investment securities	1,176,991	691,676
Loans held for sale	683,770	262,518
Mortgage servicing rights	0	0
Derivatives	68,938	21,981
Financial liabilities:
Derivatives	48,242	17,933
Significant unobservable inputs (level 3)
Financial assets:
Investment securities	0	0
Loans held for sale	215,403	0
Mortgage servicing rights	79,997	75,521
Derivatives	0	0
Financial liabilities:
Derivatives	0	0
Fair Value, Measurements, Recurring
Financial assets:
Equity securities, at fair value	4,591	3,295
Investment securities	1,176,991	691,676
Loans held for sale	899,173	262,518
Mortgage servicing rights	79,997	75,521
Derivatives	68,938	21,981
Financial liabilities:
Derivatives	48,242	17,933
Fair Value, Measurements, Recurring | U.S. government agency securities
Financial assets:
Available-for-sale debt securities, at fair value	2,003
Fair Value, Measurements, Recurring | Mortgage-backed securities - residential
Financial assets:
Available-for-sale debt securities, at fair value	773,336	477,312
Fair Value, Measurements, Recurring | Mortgage-backed securities - commercial
Financial assets:
Available-for-sale debt securities, at fair value	21,588	13,364
Fair Value, Measurements, Recurring | Municipals, tax-exempt
Financial assets:
Available-for-sale debt securities, at fair value	356,329	189,235
Fair Value, Measurements, Recurring | U.S. Treasury securities
Financial assets:
Available-for-sale debt securities, at fair value	16,628	7,448
Fair Value, Measurements, Recurring | Corporate securities
Financial assets:
Available-for-sale debt securities, at fair value	2,516	1,022
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (liabilities) (level 1)
Financial assets:
Equity securities, at fair value	0	0
Investment securities	0	0
Loans held for sale	0	0
Mortgage servicing rights	0	0
Derivatives	0	0
Financial liabilities:
Derivatives	0	0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | U.S. government agency securities
Financial assets:
Available-for-sale debt securities, at fair value	0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Mortgage-backed securities - residential
Financial assets:
Available-for-sale debt securities, at fair value	0	0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Mortgage-backed securities - commercial
Financial assets:
Available-for-sale debt securities, at fair value	0	0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Municipals, tax-exempt
Financial assets:
Available-for-sale debt securities, at fair value	0	0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | U.S. Treasury securities
Financial assets:
Available-for-sale debt securities, at fair value	0	0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Corporate securities
Financial assets:
Available-for-sale debt securities, at fair value	0	0
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2)
Financial assets:
Equity securities, at fair value	4,591	3,295
Investment securities	1,176,991	691,676
Loans held for sale	683,770	262,518
Mortgage servicing rights	0	0
Derivatives	68,938	21,981
Financial liabilities:
Derivatives	48,242	17,933
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2) | U.S. government agency securities
Financial assets:
Available-for-sale debt securities, at fair value	2,003
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2) | Mortgage-backed securities - residential
Financial assets:
Available-for-sale debt securities, at fair value	773,336	477,312
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2) | Mortgage-backed securities - commercial
Financial assets:
Available-for-sale debt securities, at fair value	21,588	13,364
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2) | Municipals, tax-exempt
Financial assets:
Available-for-sale debt securities, at fair value	356,329	189,235
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2) | U.S. Treasury securities
Financial assets:
Available-for-sale debt securities, at fair value	16,628	7,448
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2) | Corporate securities
Financial assets:
Available-for-sale debt securities, at fair value	2,516	1,022
Fair Value, Measurements, Recurring | Significant unobservable inputs (level 3)
Financial assets:
Equity securities, at fair value	0	0
Investment securities	0	0
Loans held for sale	215,403	0
Mortgage servicing rights	79,997	75,521
Derivatives	0	0
Financial liabilities:
Derivatives	0	0
Fair Value, Measurements, Recurring | Significant unobservable inputs (level 3) | U.S. government agency securities
Financial assets:
Available-for-sale debt securities, at fair value	0
Fair Value, Measurements, Recurring | Significant unobservable inputs (level 3) | Mortgage-backed securities - residential
Financial assets:
Available-for-sale debt securities, at fair value	0	0
Fair Value, Measurements, Recurring | Significant unobservable inputs (level 3) | Mortgage-backed securities - commercial
Financial assets:
Available-for-sale debt securities, at fair value	0	0
Fair Value, Measurements, Recurring | Significant unobservable inputs (level 3) | Municipals, tax-exempt
Financial assets:
Available-for-sale debt securities, at fair value	0	0
Fair Value, Measurements, Recurring | Significant unobservable inputs (level 3) | U.S. Treasury securities
Financial assets:
Available-for-sale debt securities, at fair value	0	0
Fair Value, Measurements, Recurring | Significant unobservable inputs (level 3) | Corporate securities
Financial assets:
Available-for-sale debt securities, at fair value	$ 0	$ 0

Fair value of financial instr_5

Fair value of financial instruments - Balances and Levels of Assets Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial assets:
Collateral dependent loans		$ 23,810
Fair Value, Measurements, Nonrecurring
Financial assets:
Other real estate owned	$ 6,662	9,774
Collateral dependent loans	18,560	10,691
Fair Value, Measurements, Nonrecurring | Commercial and industrial
Financial assets:
Collateral dependent loans	1,728	6,481
Fair Value, Measurements, Nonrecurring | Construction
Financial assets:
Collateral dependent loans	3,877
Fair Value, Measurements, Nonrecurring | Residential real estate | 1-to-4 family mortgage
Financial assets:
Collateral dependent loans	226	378
Fair Value, Measurements, Nonrecurring | Residential real estate | Residential line of credit
Financial assets:
Collateral dependent loans	1,174	321
Fair Value, Measurements, Nonrecurring | Commercial real estate | Owner occupied
Financial assets:
Collateral dependent loans		951
Fair Value, Measurements, Nonrecurring | Commercial real estate | Non-owner occupied
Financial assets:
Collateral dependent loans	3,391	2,560
Fair Value, Measurements, Nonrecurring | Consumer and other
Financial assets:
Collateral dependent loans	8,164
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1)
Financial assets:
Other real estate owned	0	0
Collateral dependent loans	0	0
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Commercial and industrial
Financial assets:
Collateral dependent loans	0	0
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Construction
Financial assets:
Collateral dependent loans	0
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Residential real estate | 1-to-4 family mortgage
Financial assets:
Collateral dependent loans	0	0
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Residential real estate | Residential line of credit
Financial assets:
Collateral dependent loans	0	0
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Commercial real estate | Owner occupied
Financial assets:
Collateral dependent loans		0
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Commercial real estate | Non-owner occupied
Financial assets:
Collateral dependent loans	0	0
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Consumer and other
Financial assets:
Collateral dependent loans	0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2)
Financial assets:
Other real estate owned	0	0
Collateral dependent loans	0	0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2) | Commercial and industrial
Financial assets:
Collateral dependent loans	0	0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2) | Construction
Financial assets:
Collateral dependent loans	0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2) | Residential real estate | 1-to-4 family mortgage
Financial assets:
Collateral dependent loans	0	0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2) | Residential real estate | Residential line of credit
Financial assets:
Collateral dependent loans	0	0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2) | Commercial real estate | Owner occupied
Financial assets:
Collateral dependent loans		0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2) | Commercial real estate | Non-owner occupied
Financial assets:
Collateral dependent loans	0	0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2) | Consumer and other
Financial assets:
Collateral dependent loans	0
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3)
Financial assets:
Other real estate owned	6,662	9,774
Collateral dependent loans	18,560	10,691
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Commercial and industrial
Financial assets:
Collateral dependent loans	1,728	6,481
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Construction
Financial assets:
Collateral dependent loans	3,877
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Residential real estate | 1-to-4 family mortgage
Financial assets:
Collateral dependent loans	226	378
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Residential real estate | Residential line of credit
Financial assets:
Collateral dependent loans	1,174	321
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Commercial real estate | Owner occupied
Financial assets:
Collateral dependent loans		951
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Commercial real estate | Non-owner occupied
Financial assets:
Collateral dependent loans	3,391	$ 2,560
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Consumer and other
Financial assets:
Collateral dependent loans	$ 8,164

Fair value of financial instr_6

Fair value of financial instruments - Information about Significant Unobservable Inputs (Level 3) Used in Valuation of Assets Measured at Fair Value on Nonrecurring Basis (Details) $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans		$ 23,810
Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	$ 6,662	9,774
Impaired loans	18,560	10,691
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent loans	18,560
Other real estate owned	6,662	9,774
Impaired loans	$ 18,560	$ 10,691
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent loans, measurement input	0
Other real estate owned, measurement input	0	0
Impaired loans, measurement input	0.00%
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Collateral dependent loans, measurement input	0.30
Other real estate owned, measurement input	0.15	0.15
Impaired loans, measurement input	30.00%

Fair value of financial instr_7

Fair value of financial instruments - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Mortgage Loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net gains (losses) from fair value changes of mortgage loans	$ 24,233,000	$ (2,861,000)	$ (4,539,000)
GNMA
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Delinquent GNMA loans that had been previously sold	$ 151,184,000	$ 51,705,000

Fair value of financial instr_8

Fair value of financial instruments - Differences between Fair Value and Principal Balance for Loans Held for Sale Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Aggregate fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	$ 683,770	$ 262,518
Past due loans of 90 days or more	83	0
Nonaccrual loans	6,406	0
Aggregate fair value | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	208,914
Aggregate Unpaid Principal Balance
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	651,887	254,868
Past due loans of 90 days or more	163	0
Nonaccrual loans	12,033	0
Aggregate Unpaid Principal Balance | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	226,867
Difference
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	31,883	7,650
Past due loans of 90 days or more	(80)	0
Nonaccrual loans	(5,627)	$ 0
Difference | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	$ (17,953)

Parent company financial stat_3

Parent company financial statements - Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 1,317,898		$ 232,681
Equity securities, at fair value	4,591		3,295
Other assets	274,116		122,714
Goodwill	242,561		169,051	$ 137,190
Total assets	11,207,330		6,124,921	$ 5,136,764
LIABILITIES
Borrowings	238,324		304,675
Accrued expenses and other liabilities	164,400		87,454
Total liabilities	9,915,948		5,362,592
SHAREHOLDERS' EQUITY
Common stock	47,222		31,034
Additional paid-in capital	898,847		425,633
Retained earnings	317,625	$ 293,524	293,524
Accumulated other comprehensive income	27,595		12,138
Total FB Financial Corporation shareholders' equity	1,291,289		762,329
Total liabilities and shareholders' equity	11,207,330		6,124,921
Parent Company
ASSETS
Cash and cash equivalents	5,310		4,673
Equity securities, at fair value	1,173		0
Investments in subsidiaries	1,378,347		782,565
Other assets	12,240		6,292
Goodwill	29		29
Total assets	1,397,099		793,559
LIABILITIES
Borrowings	106,299		30,930
Accrued expenses and other liabilities	(489)		300
Total liabilities	105,810		31,230
SHAREHOLDERS' EQUITY
Common stock	47,222		31,034
Additional paid-in capital	898,847		425,633
Retained earnings	317,625		293,524
Accumulated other comprehensive income	27,595		12,138
Total FB Financial Corporation shareholders' equity	1,291,289		762,329
Total liabilities and shareholders' equity	$ 1,397,099		$ 793,559

Parent company financial stat_4

Parent company financial statements - Income Statements (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income
Dividend income from subsidiaries									$ 2,705	$ 4,051	$ 2,126
(Loss) gain from other assets									(90)	(104)	328
Net interest income	$ 85,244	$ 68,828	$ 55,337	$ 56,249	$ 57,692	$ 58,305	$ 57,023	$ 53,016	265,658	226,036	204,068
Interest expense
Interest expense	12,992	12,299	10,270	13,425	13,951	14,937	14,696	12,917	48,986	56,501	35,503
Other noninterest expense									213,945	146,653	121,200
Net income applicable to FB Financial Corporation	$ 45,602	$ (5,599)	$ 22,873	$ 745	$ 21,572	$ 23,966	$ 18,688	$ 19,588	63,621	83,814	80,236
Parent Company
Income
Dividend income from subsidiaries									49,706	0	0
Gain on investments									217	0	0
(Loss) gain from other assets									0	(16)	297
Other income									1,732	211	0
Net interest income									51,655	195	297
Interest expense
Interest expense									3,122	1,638	1,651
Salaries, legal and professional fees									1,458	1,056	1,481
Other noninterest expense									283	120	960
Total expenses									4,863	2,814	4,092
Income (loss) before income tax benefit and equity in undistributed earnings of subsidiaries									46,792	(2,619)	(3,795)
Federal and state income tax benefit									(1,155)	(683)	(746)
Income (loss) before equity in undistributed earnings of subsidiaries									47,947	(1,936)	(3,049)
Equity in undistributed earnings from subsidiaries									15,674	85,750	83,285
Net income applicable to FB Financial Corporation									$ 63,621	$ 83,814	$ 80,236

Parent company financial stat_5

Parent company financial statements - Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities
Net income	$ 45,602	$ (5,599)	$ 22,873	$ 745	$ 21,572	$ 23,966	$ 18,688	$ 19,588	$ 63,621	$ 83,814	$ 80,236
Adjustments to reconcile net income to net cash used in operating activities:
Loss (gain) on other assets									90	104	(328)
Stock-based compensation expense									10,214	7,089	7,207
Net cash (used in) provided by operating activities									(269,287)	63,905	212,208
Investing Activities
Proceeds from the sale of other assets									0	0	869
Net cash provided by (used in) investing activities									309,421	(182,913)	(586,501)
Financing Activities
Accretion of interest rate premium on subordinated debt									(436)	0	0
Payment of dividends									(14,264)	(10,045)	(6,137)
Proceeds from other borrowings									15,000	0	0
Net proceeds from sale of common stock under employee stock purchase program									978	804	1,196
Net cash provided by financing activities									1,045,083	226,333	379,898
Net change in cash and cash equivalents									1,085,217	107,325	5,605
Cash and cash equivalents at beginning of the period				232,681				125,356	232,681	125,356	119,751
Cash and cash equivalents at end of the period	1,317,898				232,681				1,317,898	232,681	125,356
Supplemental cash flow information:
Dividends declared not paid on restricted stock units	238				149				238	149	226
Parent Company
Operating Activities
Net income									63,621	83,814	80,236
Adjustments to reconcile net income to net cash used in operating activities:
Equity in undistributed income of subsidiaries									(15,674)	(85,750)	(83,285)
Gain on investments									(217)	0	0
Loss (gain) on other assets									0	16	(297)
Stock-based compensation expense									10,214	7,089	7,207
(Increase) decrease in other assets									(9,717)	1,056	(441)
Decrease in other liabilities									(13,363)	(9,711)	(7,737)
Net cash (used in) provided by operating activities									34,864	(3,486)	(4,317)
Investing Activities
Proceeds from the sale of other assets									0	0	869
Net cash paid in business combinations (See Note 2)									(35,505)	0	0
Net cash provided by (used in) investing activities									(35,505)	0	869
Financing Activities
Accretion of interest rate premium on subordinated debt									(436)	0	0
Payment of dividends									(14,264)	(10,045)	(6,137)
Proceeds from other borrowings									15,000	0	0
Net proceeds from sale of common stock under employee stock purchase program									978	804	1,196
Net cash provided by financing activities									1,278	(9,241)	(4,941)
Net change in cash and cash equivalents									637	(12,727)	(8,389)
Cash and cash equivalents at beginning of the period				$ 4,673				$ 17,400	4,673	17,400	25,789
Cash and cash equivalents at end of the period	5,310				4,673				5,310	4,673	17,400
Supplemental cash flow information:
Dividends declared not paid on restricted stock units	$ 238				$ 149				238	149	226
Noncash dividend from Bank									$ 956	$ 0	$ 572

Segment reporting - Narrative (

Segment reporting - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)segment	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Other noninterest expense	$ 213,945	$ 146,653	$ 121,200
Relief of goodwill due to sale of TPO mortgage delivery channel	0	100	0
Mortgage
Segment Reporting Information [Line Items]
Other noninterest expense	1,055	1,995	0
Relief of goodwill due to sale of TPO mortgage delivery channel		100
Interest paid	$ 14,810	$ 11,183	16,057
Mortgage | Prime Interest Rate
Segment Reporting Information [Line Items]
Warehouse line of credit interest rate	3.25%	4.75%
Banking
Segment Reporting Information [Line Items]
Other noninterest expense	$ 212,890	$ 144,658	$ 121,200

Segment reporting - Segment Fin

Segment reporting - Segment Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net interest income	$ 85,244	$ 68,828	$ 55,337	$ 56,249	$ 57,692	$ 58,305	$ 57,023	$ 53,016	$ 265,658	$ 226,036	$ 204,068
Provisions for credit losses									107,967	7,053	5,398
Mortgage banking income									289,702	117,905	109,334
Change in fair value of mortgage servicing rights, net of hedging									(34,374)	(16,989)	(8,673)
Other noninterest income									46,527	34,481	29,981
Depreciation and amortization									7,009	5,176	4,334
Amortization of intangibles									5,323	4,339	3,185
Other noninterest mortgage banking expense									150,808	88,673	94,739
Other noninterest expense									213,945	146,653	121,200
Income before income taxes									82,461	109,539	105,854
Income tax expense	13,337	(2,040)	7,455	80	5,718	7,718	6,314	5,975	18,832	25,725	25,618
Net income applicable to FB Financial Corporation and noncontrolling interest	45,610	(5,599)	22,873	745					63,629	83,814	80,236
Net income applicable to noncontrolling interest	8	0	0	0					8	0	0
Net income applicable to FB Financial Corporation	45,602	(5,599)	22,873	745	21,572	$ 23,966	$ 18,688	$ 19,588	63,621	83,814	80,236
Total assets	11,207,330				6,124,921				11,207,330	6,124,921	5,136,764
Goodwill	242,561				169,051				242,561	169,051	137,190
Provision for credit losses on unfunded commitments	311	$ 9,567	$ 1,882	$ 1,601					13,361	0	0
Merger costs									34,879	5,385	1,594
Banking
Segment Reporting Information [Line Items]
Net interest income									265,581	226,098	204,517
Provisions for credit losses									107,967	7,053	5,398
Mortgage banking income									75,426	30,429	25,460
Change in fair value of mortgage servicing rights, net of hedging									0	0	0
Other noninterest income									46,527	34,481	29,981
Depreciation and amortization									6,425	4,670	3,827
Amortization of intangibles									5,323	4,339	3,185
Other noninterest mortgage banking expense									49,010	23,216	21,671
Other noninterest expense									212,890	144,658	121,200
Income before income taxes									5,919	107,072	104,677
Total assets	10,529,812				5,795,888				10,529,812	5,795,888	4,752,111
Goodwill	242,561				169,051				242,561	169,051	137,090
Merger costs									33,824
Mortgage
Segment Reporting Information [Line Items]
Net interest income									77	(62)	(449)
Provisions for credit losses									0	0	0
Mortgage banking income									214,276	87,476	83,874
Change in fair value of mortgage servicing rights, net of hedging									(34,374)	(16,989)	(8,673)
Other noninterest income									0	0	0
Depreciation and amortization									584	506	507
Amortization of intangibles									0	0	0
Other noninterest mortgage banking expense									101,798	65,457	73,068
Other noninterest expense									1,055	1,995	0
Income before income taxes									76,542	2,467	1,177
Total assets	677,518				329,033				677,518	329,033	384,653
Goodwill	$ 0				$ 0				0	$ 0	100
Merger costs									$ 1,055
Offering costs											$ 671

Minimum capital requirements (D

Minimum capital requirements (Details) $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
FB Financial Corporation
Total Capital (to risk-weighted assets)
Actual, Amount	$ 1,358,897	$ 633,549
Actual, Ratio	0.150	0.122
Minimum Capital adequacy with capital buffer, Amount	$ 952,736	$ 545,268
Minimum Capital adequacy with capital buffer, Ratio	0.105	0.105
Tier 1 Capital (to risk-weighted assets)
Actual, Amount	$ 1,090,364	$ 602,410
Actual, Ratio	0.120	0.116
Minimum Capital adequacy with capital buffer, Amount	$ 771,262	$ 441,421
Minimum Capital adequacy with capital buffer, Ratio	8.50%	8.50%
Tier 1 Capital (to average assets)
Actual, Amount	$ 1,090,364	$ 602,410
Actual, Ratio	0.100	0.101
Minimum Capital adequacy with capital buffer, Amount	$ 435,064	$ 238,578
Minimum Capital adequacy with capital buffer. Ratio	0.040	0.0400
Common Equity Tier 1 Capital (to risk-weighted assets)
Actual, Amount	$ 1,060,364	$ 572,410
Actual Ratio	11.70%	11.10%
Minimum Capital adequacy with capital buffer, Amount	$ 635,157	$ 360,979
Minimum Capital adequacy with capital buffer, Ratio	0.070	0.070
FirstBank
Total Capital (to risk-weighted assets)
Actual, Amount	$ 1,353,279	$ 623,432
Actual, Ratio	0.149	0.121
Minimum Capital adequacy with capital buffer, Amount	$ 951,327	$ 540,995
Minimum Capital adequacy with capital buffer, Ratio	0.105	0.105
To be well capitalized under prompt corrective action provisions, Amount	$ 906,026	$ 515,233
To be well capitalized under prompt corrective action provisions, Ratio	0.100	0.100
Tier 1 Capital (to risk-weighted assets)
Actual, Amount	$ 1,142,548	$ 592,293
Actual, Ratio	0.126	0.115
Minimum Capital adequacy with capital buffer, Amount	$ 770,122	$ 437,782
Minimum Capital adequacy with capital buffer, Ratio	8.50%	8.50%
To be well capitalized under prompt corrective action provisions Amount	$ 724,820	$ 412,030
To be well capitalized under prompt corrective action provisions Ratio	0.080	0.080
Tier 1 Capital (to average assets)
Actual, Amount	$ 1,142,548	$ 592,293
Actual, Ratio	0.105	0.099
Minimum Capital adequacy with capital buffer, Amount	$ 435,279	$ 239,310
Minimum Capital adequacy with capital buffer. Ratio	0.040	0.0400
To be well capitalized under prompt corrective action provisions, Amount	$ 544,098	$ 299,138
To be well capitalized under prompt corrective action provisions, Ratio	0.050	0.050
Common Equity Tier 1 Capital (to risk-weighted assets)
Actual, Amount	$ 1,142,548	$ 592,293
Actual Ratio	12.60%	11.50%
Minimum Capital adequacy with capital buffer, Amount	$ 634,218	$ 360,526
Minimum Capital adequacy with capital buffer, Ratio	0.070	0.070
To be well capitalized under prompt corrective action provisions, Amount	$ 588,917	$ 334,774
To be well capitalized under prompt corrective action provisions, Ratio	6.50%	6.50%

Employee benefit plans (Details

Employee benefit plans (Details)	Jun. 28, 2016	Dec. 31, 2020USD ($)shares	Dec. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)	Dec. 31, 2014USD ($)$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discretionary contribution percentage			50.00%	25.00%
Maximum percentage of amount to be contributed by the employer			6.00%	6.00%
Matching and profit sharing vesting period			3 years	5 years
Contribution provided by the bank to the plan		$ 3,198,000	$ 2,325,000	$ 2,211,000
Post retirement benefits payable		1,112,000	1,315,000
Expense related to plans		29,000	1,000	4,000
Payments to participants		131,000	150,000	191,000
Cash surrender value on bank owned life insurance		71,977,000	11,357,000
Cash value income		1,556,000	240,000	158,000
Deferred compensation		2,261,000	1,718,000
Salaries, commissions and employee benefits		$ 233,768,000	152,084,000	136,892,000
2012 EBI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants authorized under the plan (in shares) | shares		0
Deferred Compensation Plans and Agreements
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments to participants			1,191,000	1,818,000
Liability for cash-settled awards			$ 993,000
Number of units remaining in equity based incentive plan for cash settlement | shares			29,172
Salaries, commissions and employee benefits			$ 484,000	$ 3,787,000
Deferred Compensation Plans and Agreements | 2012 EBI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock split ratio	100
Deferred Compensation Plans and Agreements | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock split ratio			1
Deferred compensation			$ 3,000,000		$ 3,000,000
Deferred stock units issued (in shares) | shares		0	157,895
IPO price (USD per share) | $ / shares					$ 19

Stock-based compensation - Chan

Stock-based compensation - Changes in Restricted Stock Units (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 15, 2020
Franklin Financial Network, Inc.
Weighted Average Grant Date Fair Value
Replacement awards issued to employees (in shares)				118,776
RSUs
Restricted Stock Units Outstanding
Balance at beginning of period (in shares)	826,263,000
Granted (in shares)	420,521,000
Vested (in shares)	(177,581,000)
Forfeited (in shares)	(22,132,000)
Balance at end of period (in shares)	1,047,071,000	826,263,000
Weighted Average Grant Date Fair Value
Balance at beginning of period (in USD per share)	$ 23.76
Granted (USD per share)	31.35	$ 34.08	$ 39.55
Vested (USD per share)	31.64
Forfeited (USD per share)	33.20
Balance at end of period (in USD per share)	$ 26.06	$ 23.76

Stock-based compensation - Narr

Stock-based compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to nonvested awards	$ 10,214	$ 7,089	$ 7,207
Dividends declared not paid on restricted stock units	$ 238	$ 149	226
2016-LTIP Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuable (in shares)	2,240,434	2,377,574
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance (in shares)	2,379,006	2,409,185
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock units vested and released	$ 5,619	$ 9,923	$ 4,562
Weighted average grant date fair value price of restricted stock granted (in USD per share)	$ 31.35	$ 34.08	$ 39.55
Compensation cost related to nonvested awards	$ 9,213	$ 7,089	$ 7,436
Awards granted (in shares)	420,521,000
Forfeitures (in shares)	22,132,000
Vesting (in shares)	177,581,000
RSUs | Independent Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to nonvested awards	$ 898	724	$ 645
Stock-Settled EBI Units and RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested awards	$ 13,436
Expected weighted-average period to be recognized	2 years 6 months
Dividends declared not paid on restricted stock units	$ 613	$ 375
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to nonvested awards	1,001
Unrecognized compensation cost related to nonvested awards	$ 2,482
Expected weighted-average period to be recognized	2 years 1 month 6 days
Criteria period	3 years
Vesting period	3 years
Awards granted (in shares)	53,147
Award vesting, percentage	181.00%
Forfeitures (in shares)	0
Vesting (in shares)	0
Employee Stock | ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuable (in shares)	200,000
Purchase price percentage of subsequent offering periods	95.00%
Maximum number of shares per participant (in shares)	725
Maximum worth of award per participant	$ 25
Shares issued under plan (in shares)	30,179,000	23,171,000
Minimum | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Core return threshold percentages	0.00%
Maximum | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Core return threshold percentages	200.00%

Related party transactions - Lo

Related party transactions - Loans Analysis to Executive Officers, Certain Management, Bank Directors and Their Affiliates (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
Financing Receivable, Related Parties [Roll Forward]
Loans outstanding at January 1, 2020	$ 30,880
New loans and advances	10,492
Change in related party status	(3,462)
Repayments	(13,235)
Loans outstanding at December 31, 2020	$ 24,675

Related party transactions - Na

Related party transactions - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Deposits from related parties	$ 245,084	$ 238,781
Lease expense			$ 5,019
Aviation Time Sharing Agreement
Related Party Transaction [Line Items]
Payments to related party	161	266	208
Certain Executive Officers, Certain Management and Directors and Their Associates | Unfunded Loan Commitment
Related Party Transaction [Line Items]
Unfunded commitments	23,059	19,404
Director
Related Party Transaction [Line Items]
Unamortized leasehold improvements	53	86
Operating lease expense	$ 510	$ 509
Lease expense			$ 516

Quarterly Results of Operatio_3

Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 98,236	$ 81,127	$ 65,607	$ 69,674	$ 71,643	$ 73,242	$ 71,719	$ 65,933	$ 314,644	$ 282,537	$ 239,571
Interest expense	12,992	12,299	10,270	13,425	13,951	14,937	14,696	12,917	48,986	56,501	35,503
Net interest income	85,244	68,828	55,337	56,249	57,692	58,305	57,023	53,016	265,658	226,036	204,068
Provision for credit losses	(3,231)	45,834	24,039	27,964	2,950	1,831	881	1,391	94,606	7,053	5,398
Provision for Credit Losses On Unfunded Commitments	311	9,567	1,882	1,601					13,361	0	0
Net interest income after provisions for credit losses	88,164	13,427	29,416	26,684	54,742	56,474	56,142	51,625	157,691	218,983	198,670
Noninterest income	80,638	97,026	81,491	42,700	35,234	38,145	32,979	29,039	301,855	135,397	130,642
Noninterest expense	109,855	118,092	80,579	68,559	62,686	62,935	64,119	55,101	377,085	244,841	223,458
Income tax expense	13,337	(2,040)	7,455	80	5,718	7,718	6,314	5,975	18,832	25,725	25,618
Net income applicable to FB Financial Corporation and noncontrolling interest	45,610	(5,599)	22,873	745					63,629	83,814	80,236
Net income applicable to noncontrolling interest	8	0	0	0					8	0	0
Net income applicable to FB Financial Corporation	$ 45,602	$ (5,599)	$ 22,873	$ 745	$ 21,572	$ 23,966	$ 18,688	$ 19,588	$ 63,621	$ 83,814	$ 80,236
Weighted average common shares outstanding:
Basic (in shares)	47,204,738	40,154,841	32,094,274	31,257,739	30,934,092	30,899,583	30,859,596	30,786,684	37,621,720	30,870,474	30,675,755
Diluted (in shares)	47,791,659	40,637,745	32,506,417	31,734,112	31,470,565	31,425,573	31,378,018	31,349,198	38,099,744	31,402,897	31,314,981
Earnings per share
Basic (in dollars per share)	$ 0.97	$ (0.14)	$ 0.71	$ 0.02	$ 0.69	$ 0.77	$ 0.60	$ 0.63	$ 1.69	$ 2.70	$ 2.60
Diluted (in dollars per share)	$ 0.95	$ (0.14)	$ 0.70	$ 0.02	$ 0.68	$ 0.76	$ 0.59	$ 0.62	$ 1.67	$ 2.65	$ 2.55