FB Financial (FBK) 10-Q 7 Nov 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 05, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Registrant Name	FB Financial Corp
Entity Central Index Key	0001649749
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Smaller Reporting Company	false
Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		30,932,152

Consolidated balance sheets

Consolidated balance sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Cash and due from banks	$ 31,594	$ 38,381
Federal funds sold	50,532	31,364
Interest-bearing deposits in financial institutions	160,871	55,611
Cash and cash equivalents	242,997	125,356
Investments:
Available-for-sale debt securities, at fair value	668,531	655,698
Equity securities, at fair value	3,250	3,107
Federal Home Loan Bank stock, at cost	15,976	13,432
Loans held for sale, at fair value	305,493	278,815
Loans	4,345,344	3,667,511
Less: allowance for loan losses	31,464	28,932
Net loans	4,313,880	3,638,579
Premises and equipment, net	91,815	86,882
Other real estate owned, net	16,076	12,643
Operating lease right-of-use assets	34,812	0
Interest receivable	17,729	14,503
Mortgage servicing rights, at fair value	66,156	88,829
Goodwill	168,486	137,190
Core deposit and other intangibles, net	18,748	11,628
Other assets	124,946	70,102
Total assets	6,088,895	5,136,764
Deposits
Noninterest-bearing	1,214,373	949,135
Interest-bearing checking	1,029,430	863,706
Money market and savings	1,481,697	1,239,131
Customer time deposits	1,170,827	1,016,638
Brokered and internet time deposits	25,436	103,107
Total deposits	4,921,763	4,171,717
Borrowings	307,129	227,776
Operating lease liabilities	37,760	0
Accrued expenses and other liabilities	77,408	65,414
Total liabilities	5,344,060	4,464,907
SHAREHOLDERS' EQUITY
Common stock, $1 par value per share; 75,000,000 shares authorized; 30,927,664 and 30,724,532 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	30,928	30,725
Additional paid-in capital	426,816	424,146
Retained earnings	274,491	221,213
Accumulated other comprehensive income (loss), net	12,600	(4,227)
Total shareholders' equity	744,835	671,857
Total liabilities and shareholders' equity	$ 6,088,895	$ 5,136,764

Consolidated balance sheets (Pa

Consolidated balance sheets (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
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)	30,927,664	30,724,532
Common stock, shares outstanding (in shares)	30,927,664	30,724,532

Consolidated statements of inco

Consolidated statements of income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income:
Interest and fees on loans	$ 67,639	$ 57,904	$ 194,363	$ 163,126
Interest on securities
Taxable	3,137	3,151	10,254	9,137
Tax-exempt	1,174	1,031	3,478	2,937
Other	1,292	526	2,799	1,303
Total interest income	73,242	62,612	210,894	176,503
Interest expense:
Deposits	13,522	7,864	38,865	18,833
Borrowings	1,415	1,993	3,685	4,969
Total interest expense	14,937	9,857	42,550	23,802
Net interest income	58,305	52,755	168,344	152,701
Provision for loan losses	1,831	1,818	4,103	3,198
Net interest income after provision for loan losses	56,474	50,937	164,241	149,503
Noninterest income:
(Loss) gain from securities, net	(20)	(27)	75	(116)
(Loss) gain on sales or write-downs of other real estate owned	(126)	120	112	(43)
Gain from other assets	44	326	52	239
Other income	2,114	1,257	5,598	4,283
Total noninterest income	38,145	34,355	100,163	103,393
Noninterest expenses:
Salaries, commissions and employee benefits	40,880	35,213	112,495	103,606
Occupancy and equipment expense	4,058	3,514	12,107	10,483
Legal and professional fees	1,993	1,917	5,412	5,925
Data processing	2,816	2,562	7,843	6,735
Merger costs	295	0	4,699	1,193
Amortization of core deposit and other intangibles	1,197	777	3,180	2,432
Advertising	1,895	3,810	7,066	10,500
Other expense	9,801	9,420	29,353	28,848
Total noninterest expense	62,935	57,213	182,155	169,722
Income before income taxes	31,684	28,079	82,249	83,174
Income tax expense	7,718	6,702	20,007	19,978
Net income	$ 23,966	$ 21,377	$ 62,242	$ 63,196
Earnings per common share
Basic (in dollars per share)	$ 0.77	$ 0.69	$ 2.01	$ 2.05
Fully diluted (in dollars per share)	$ 0.76	$ 0.68	$ 1.97	$ 2.01
Mortgage banking income
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	$ 29,193	$ 26,649	$ 74,740	$ 81,664
Service charges on deposit accounts
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	2,416	2,208	6,822	6,216
ATM and interchange fees
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	3,188	2,411	8,846	7,353
Investment services and trust income
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	$ 1,336	$ 1,411	$ 3,918	$ 3,797

Consolidated statements of comp

Consolidated statements of comprehensive income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 23,966	$ 21,377	$ 62,242	$ 63,196
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) in available-for-sale securities, net of taxes of $1,296, ($1,348), $6,430 and ($4,667)	3,762	(3,749)	18,265	(12,845)
Reclassification adjustment for (gain) loss on sale of securities included in net income, net of taxes of $20, $0, $20 and $2	55	0	56	7
Net change in unrealized (loss) gain in hedging activities, net of taxes of ($90), $59, ($407) and $577	(256)	169	(1,151)	1,638
Reclassification adjustment for (gain) loss on hedging activities, net of taxes of ($46), $23, ($121) and $22	(130)	(69)	(343)	(62)
Total other comprehensive income (loss), net of tax	3,431	(3,649)	16,827	(11,262)
Comprehensive income	$ 27,397	$ 17,728	$ 79,069	$ 51,934

Consolidated statements of co_2

Consolidated statements of comprehensive income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net change in unrealized gain (loss) in available for sale securities, tax	$ 1,296	$ (1,348)	$ 6,430	$ (4,667)
Reclassification adjustment for gain on sale of securities included in net income, tax	20	0	20	2
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification, tax	(90)	59	(407)	577
Reclassification adjustment for gain on hedging activities, tax	$ (46)	$ 23	$ (121)	$ 22

Consolidated statements of chan

Consolidated statements of changes in shareholders' equity - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income, net
Balance at Dec. 31, 2017	$ 596,729	$ 30,536	$ 418,596	$ 147,449	$ 148
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	63,196			63,196
Other comprehensive (loss) income, net of taxes	(11,262)				(11,262)
Stock based compensation expense	5,327	9	5,318
Restricted stock units vested and distributed, net of shares withheld	(2,637)	142	(2,779)
Shares issued under employee stock purchase program	1,196	29	1,167
Cash dividends declared	(3,818)			(3,818)
Balance at Sep. 30, 2018	648,731	30,716	422,302	206,718	(11,005)
Balance at Jun. 30, 2018	630,959	30,683	420,382	187,250	(7,356)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,377			21,377
Other comprehensive (loss) income, net of taxes	(3,649)				(3,649)
Stock based compensation expense	1,508	3	1,505
Restricted stock units vested and distributed, net of shares withheld	(82)	18	(100)
Shares issued under employee stock purchase program	527	12	515
Cash dividends declared	(1,909)			(1,909)
Balance at Sep. 30, 2018	648,731	30,716	422,302	206,718	(11,005)
Balance at Dec. 31, 2018	671,857	30,725	424,146	221,213	(4,227)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	62,242			62,242
Other comprehensive (loss) income, net of taxes	16,827				16,827
Stock based compensation expense	5,621	9	5,612
Restricted stock units vested and distributed, net of shares withheld	(3,552)	171	(3,723)
Shares issued under employee stock purchase program	804	23	781
Cash dividends declared	(7,655)			(7,655)
Balance at Sep. 30, 2019	744,835	30,928	426,816	274,491	12,600
Balance at Jun. 30, 2019	718,759	30,866	425,644	253,080	9,169
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,966			23,966
Other comprehensive (loss) income, net of taxes	3,431				3,431
Stock based compensation expense	1,836	3	1,833
Restricted stock units vested and distributed, net of shares withheld	(1,042)	47	(1,089)
Shares issued under employee stock purchase program	440	12	428
Cash dividends declared	(2,555)			(2,555)
Balance at Sep. 30, 2019	$ 744,835	$ 30,928	$ 426,816	$ 274,491	$ 12,600

Consolidated statements of ch_2

Consolidated statements of changes in shareholders' equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (USD per share)	$ 0.08	$ 0.06	$ 0.24	$ 0.12

Consolidated statements of cash

Consolidated statements of cash flows - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 23,966,000	$ 21,377,000	$ 62,242,000	$ 63,196,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	1,380,000	1,013,000	3,830,000	3,251,000
Amortization of core deposit and other intangibles	1,197,000	777,000	3,180,000	2,432,000
Capitalization of mortgage servicing rights			(30,319,000)	(41,555,000)
Net change in fair value of mortgage servicing rights	10,611,000	1,872,000	23,832,000	(1,656,000)
Stock-based compensation expense			5,621,000	5,327,000
Provision for loan losses	1,831,000	1,818,000	4,103,000	3,198,000
Provision for mortgage loan repurchases	107,000	206,000	255,000	598,000
Accretion of yield on purchased loans			(6,030,000)	(5,745,000)
Accretion of discounts and amortization of premiums on securities, net			2,113,000	2,108,000
(Gain) loss from securities, net	20,000	27,000	(75,000)	116,000
Originations of loans held for sale			(3,477,658,000)	(4,777,814,000)
Repurchases of loans held for sale			(9,919,000)	(7,892,000)
Proceeds from sale of loans held for sale			3,527,632,000	5,003,669,000
Gain on sale and change in fair value of loans held for sale			(72,749,000)	(71,883,000)
Net (gain) loss or write-downs of other real estate owned	126,000	(120,000)	(112,000)	43,000
Gain on other assets	(44,000)	(326,000)	(52,000)	(239,000)
Impairment of goodwill			100,000	0
Provision for deferred income taxes	(1,449,000)	(6,665,000)	(5,900,000)	4,416,000
Changes in:
Other assets and interest receivable			(50,509,000)	(28,473,000)
Accrued expenses and other liabilities			4,243,000	(12,350,000)
Net cash (used in) provided by operating activities			(16,172,000)	140,747,000
Activity in available-for-sale securities:
Sales	22,740,000	0	24,498,000	221,000
Maturities, prepayments and calls	28,694,000	20,068,000	78,861,000	54,576,000
Purchases			(92,059,000)	(137,891,000)
Purchases of FHLB stock			(2,544,000)	(2,020,000)
Net increase in loans			(295,791,000)	(352,776,000)
Proceeds from sale of mortgage servicing rights			29,160,000	39,428,000
Purchases of premises and equipment			(4,052,000)	(8,608,000)
Proceeds from the sale of premises and equipment			1,275,000	341,000
Proceeds from the sale of other real estate owned	854,000	1,457,000	2,718,000	3,666,000
Proceeds from the sale of other assets			0	869,000
Net cash received in business combination			171,032,000	0
Net cash used in investing activities			(86,902,000)	(402,194,000)
Cash flows from financing activities:
Net increase in demand deposits			231,763,000	100,724,000
Net (decrease) increase in time deposits			(70,594,000)	364,354,000
Net increase in securities sold under agreements to repurchase and federal funds purchased			1,546,000	35,824,000
Net increase (decrease) in FHLB advances			68,235,000	(172,451,000)
Share based compensation witholding payment			(3,552,000)	(2,637,000)
Net proceeds from sale of common stock			804,000	1,196,000
Dividends paid			(7,487,000)	(3,684,000)
Net cash provided by financing activities			220,715,000	323,326,000
Net change in cash and cash equivalents			117,641,000	61,879,000
Cash and cash equivalents at beginning of the period			125,356,000	119,751,000
Cash and cash equivalents at end of the period	242,997,000	181,630,000	242,997,000	181,630,000
Supplemental cash flow information:
Interest paid			41,463,000	21,690,000
Taxes paid			21,377,000	19,137,000
Supplemental noncash disclosures:
Transfers from loans to other real estate owned	1,535,000	476,000	3,565,000	1,490,000
Transfers from premises and equipment to other real estate owned at fair value	0	0	2,640,000	0
Loans provided for sales of other real estate owned	0	191,000	166,000	636,000
Transfers from loans to loans held for sale			5,460,000	0
Transfers from loans held for sale to loans			11,476,000	13,584,000
Trade date payable - securities			3,671,000	7,253,000
Dividends declared not paid on restricted stock units	$ 168,000	$ 134,000	168,000	134,000
Decrease to retained earnings for adoption of new accounting standards			1,309,000	109,000
Right-of-use assets obtained in exchange for operating lease liabilities			39,011,000	0
GNMA
Supplemental noncash disclosures:
Derecognition of rebooked GNMA delinquent loans			$ 0	$ 43,035,000

Basis of presentation

Basis of presentation	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation: (Amounts are in thousands) Overview and presentation FB Financial Corporation (the “Company”) is a bank holding company headquartered in Nashville, Tennessee. The Company operates through its wholly-owned subsidiary, FirstBank (the "Bank"), with 68 full-service branches throughout Tennessee, north Alabama, and north Georgia, and a national mortgage business with office locations across the Southeast, which primarily originates loans to be sold in the secondary market. The unaudited consolidated financial statements, including the notes thereto of the Company, have been prepared in accordance with United States generally accepted accounting principles (“GAAP”) interim reporting requirements and general banking industry guidelines, and therefore, do not include all information and notes included in the annual consolidated financial statements in conformity with GAAP. These interim consolidated financial statements and notes thereto should be read in conjunction with the Company’s audited consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K. The unaudited consolidated financial statements include all adjustments, consisting of normal recurring adjustments, necessary for a fair presentation of the results for the interim periods. The results for interim periods are not necessarily indicative of results for a full year. 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 periods then ended. Actual results could differ significantly from those estimates. 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. Prior to May 31, 2018, the Company was considered a "controlled company" and was controlled by the Company's Executive Chairman and former majority shareholder, James W. Ayers. During the second quarter of 2018, the Company completed a secondary offering of 3,680,000 shares of common stock pursuant to the Company's effective registration statement on Form S-3 whereby James W. Ayers was the seller. As a result of this transaction, the Company ceased to qualify as a "controlled company" as the selling shareholder's ownership was reduced below 50% of the voting power of the Company's issued and outstanding shares of common stock. The Company continues to qualify as an emerging growth company as defined by the "Jumpstart Our Business Startups Act" ("JOBS Act"). Subsequent events The Company has evaluated, for consideration of recognition or disclosure, subsequent events that occurred through the date of issuance of these financial statements. The Company has determined that there were no other subsequent events other than described below that occurred after September 30, 2019, but prior to the issuance of these financial statements that would have a material impact on the Company’s consolidated financial statements. On October 17, 2019, the Company declared a regular quarterly dividend of $0.08 per share to be paid on November 15, 2019 to shareholders of record as of November 1, 2019, totaling approximately $2,556 . Earnings per 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 period, 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. The following is a summary of the basic and diluted earnings per common share calculation for each of the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Basic earnings per common share calculation: Net income $ 23,966 $ 21,377 $ 62,242 $ 63,196 Dividends paid on and undistributed earnings allocated to (128 ) (114 ) (333 ) (337 ) Earnings attributable to common shareholders $ 23,838 $ 21,263 $ 61,909 $ 62,859 Weighted-average basic shares outstanding 30,899,583 30,692,668 30,849,035 30,661,852 Basic earnings per common share $ 0.77 $ 0.69 $ 2.01 $ 2.05 Diluted earnings per common share: Earnings attributable to common shareholders 23,838 21,263 61,909 62,859 Weighted-average basic shares outstanding 30,899,583 30,692,668 30,849,035 30,661,852 Weighted-average diluted shares contingently issuable 525,990 646,960 529,751 636,802 Weighted-average diluted shares outstanding 31,425,573 31,339,628 31,378,786 31,298,654 Diluted earnings per common share $ 0.76 $ 0.68 $ 1.97 $ 2.01 Recently adopted accounting policies: Except as set forth below, the Company did not adopt any new accounting policies that were not disclosed in the Company's 2018 audited consolidated financial statements included on Form 10-K. 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 September 30, 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. Recently adopted accounting standards: Except as set forth below, the Company did not adopt any new accounting standards that were not disclosed in the Company's 2018 audited consolidated financial statements included on Form 10-K. In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” The update requires lessees to recognize right-of-use assets and lease liabilities for all leases not considered short term leases. The provisions of the update also include (a) defining direct costs to only include those incremental costs that would not have been incurred if the lease had not been entered into, (b) circumstances under which the transfer contract in a sale-leaseback transaction should be accounted for as the sale of an asset by the seller-lessee and the purchase of an asset by the buyer-lessor, and (c) additional disclosure requirements. The provisions of this update became effective for the Company on January 1, 2019. In July 2018, the FASB issued ASU 2018-10, “Codification Improvements to Topic 842, Leases” and 2018-11, “Leases (Topic 842): Targeted Improvements”. ASU No. 2018-10 provides improvements related to ASU No. 2016-02 to provide corrections or improvements to a number of areas within FASB Accounting Standards Codification ("ASC") Topic 842 and provides additional and optional transition method to adopt the new lease standard. ASU No. 2018-11 allows entities to initially apply the new lease standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. ASU 2018-11 also allows lessors to not separate non-lease components from the associated lease component if certain conditions are met. The amendments in these updates became effective for the Company on January 1, 2019. FB Financial Corporation elected the optional transition method permitted by ASU 2018-11. Under this method, an entity shall recognize and measure leases that exist at the application date and prior comparative periods are not adjusted. Additionally, the Company elected to adopt the practical expedients allowed under the updates and therefore did not reassess 1) whether any expired or existing contract contain leases, 2) the lease classification for any expired or existing leases, or 3) initial direct costs for any existing leases. On January 1, 2019, the Company adopted these updates and recognized a right of use asset ("ROU") and lease liability of $32,545 and $34,876 , respectively, and recorded a cumulative effect adjustment to retained earnings of $1,309 , net of deferred taxes of $461 , in addition to adjustments to leasehold improvements of $1,022 and a reclassification from a previously-recognized lease intangible asset for $460 . The difference between the asset and liability amounts represents lease incentive liabilities, deferred rent and a lease intangible asset that was reclassified to the ROU asset upon adoption. This adoption did not have a significant impact on the Company's consolidated statements of income and did not have an impact on the Company's cash flows. Disclosures required by the update are presented in Note 7, "Leases" in the notes to the consolidated financial statements. In March 2017, the FASB issued ASU 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities." The amendments in this ASU shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount, which continue to be amortized to maturity. Public business entities were required to prospectively apply the amendments in this ASU to annual periods beginning after December 15, 2018, including interim periods. The adoption of this update did not have an impact on the Company's consolidated financial statements. I n July 2019, the FASB issued ASU No. 2019-07, “Codification Updates to SEC Sections-Amendments to SEC Paragraphs Pursuant to SEC Final Rule Release No. 33-10532, Disclosure Update and Simplification, and Nos. 33-10231 and 33-10442, Investment Company Reporting Modernization, and Miscellaneous Updates.” These amendments modify FASB Codification to reflect previously issued SEC rules for disclosure updates and simplification and investment company reporting modernization. The SEC adopted these rules to improve its regulations on financial reporting and disclosure. Other miscellaneous updates were made to agree to the electronic Code of Federal Regulations. The amendments in this update became effective upon issuance on July 26, 2019. There were no material impacts on the consolidated financial statements. Newly issued not yet effective accounting standards: In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts and 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 model will require 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 loans obtained as a result of any acquisition not deemed to be purchased credit deteriorated ("PCD"). The new current expected credit loss standard ("CECL") also requires the allowance for credit losses for PCD loans 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. The disclosure of credit quality indicators related to the amortized cost of financing receivables will be further disaggregated by year of origination (or vintage). Institutions are to apply the changes through a cumulative-effect adjustment to their retained earnings as of the beginning of the first reporting period in which the standard is effective. ASU 2016-13 will become effective for interim and annual periods beginning after December 15, 2019. Management established a CECL implementation working group, which includes the appropriate members of management to evaluate the impact the adoption of this ASU will have on the Company's financial statements and disclosures and determine the most appropriate method of implementing the amendments in this ASU. The working group selected a software vendor and has worked to validate the accuracy and completeness of data being used as inputs into the model based on the methodology selected for the Company's identified loan segments. During the remainder of 2019, the Company will refine modeling segments and assumptions in addition to finalizing and documenting internal controls and accounting and credit policy elections, drafting disclosures, and completing model validation. Parallel processing of the existing allowance for loan losses model with the CECL model will occur during the fourth quarter of 2019. The Company is currently evaluating the impact of this adoption on its financial statements and disclosures and currently expects to record a one-time adjustment to retained earnings to increase the allowance for loan losses, however the magnitude of this adjustment cannot currently be reasonably quantified. The total increase in the allowance for loan losses will be partly offset by the existing credit discount on purchased credit impaired loans upon adoption. Management plans to disclose the total impact in Form 10-K for the year ended December 31, 2019. In December 2018, the Office of the Comptroller of the Currency ("OCC"), the Board of Governors of the Federal Reserve System, and the Federal Deposit Insurance Corporation ("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. The Company plans to adopt the transitional guidance to reduce the impact of the initial adoption to our capital. In April 2019, the FASB issued ASU No. 2019-04, "Financial Instruments—Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Financial Instruments (Topic 825): Codification Improvements" 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 will become 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 rate under the hypothetical method and will become 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 will become effective for fiscal years and interim periods beginning after December 15, 2019. The Company is currently evaluating the impact of adopting the new guidance on the consolidated financial statements, but it is not expected to have a material impact. In May 2019, the FASB issued ASU No. 2019-05, "Financial Instruments—Credit Losses (Topic 326): Targeted Transition Relief." These amendments provide targeted transition relief allowing entities to irrevocably elect the fair value option, on an instrument-by-instrument basis, for certain financial assets (excluding held-to-maturity debt securities) previously measured at amortized cost. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2019. This update will not have an impact on the Company's consolidated financial statements or disclosures. 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 will 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 recognizing 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. An entity will still 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 will become effective for interim and annual periods beginning after December 15, 2019. Early adoption is permitted, including in an interim period, for impairment tests performed after January 1, 2017. Management does not expect adoption of this standard to have any impact on the Company's consolidated financial statements or disclosures. 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. Early adoption is permitted. The Company does not expect adoption of this standard to have a significant impact on the 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 new disclosure guidance is effective for fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is currently evaluating the impact this change will have on its consolidated financial statements and disclosures. In March 2019, FASB issued ASU 2019-01, "Leases (Topic 842): Codification Improvements", which align 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 amendments in this update become effective for fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is currently evaluating the impact of this change on its consolidated financial statements and disclosures, but it is not expected to have a material impact.

Mergers and acquisitions

Mergers and acquisitions	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Mergers and acquisitions	Mergers and acquisitions: FNB Financial Corp. merger On September 17, 2019, the Company entered into a definitive agreement to acquire FNB Financial Corp. and its wholly owned subsidiary, Farmers National Bank of Scottsville (collectively, "Farmers National"). Farmers National has five branches and reported total assets of $251,216 , loans of $174,850 and deposits of $201,909 as of September 30, 2019. The Company expects to issue 954,827 shares of FBK common stock as consideration in connection with the merger, in addition to approximately $15,000 in cash consideration. The market value of the stock consideration will fluctuate with the market price of the Company's common stock and will not be known until the merger is consummated. Based on the closing price of the Company's common stock on the New York Stock Exchange of $38.26 on September 17, 2019, the merger consideration represented approximately $51,900 in aggregate consideration. The acquisition is expected to close in the first quarter of 2020 and is subject to regulatory approvals, approval by FNB Financial Corp. shareholders and other customary closing conditions. Upon consummation, Farmers National will be merged with and into FB Financial. The Farmers National merger will be accounted for under FASB ASC Topic 805, "Business Combinations." Atlantic Capital Bank branch acquisition On April 5, 2019, the Bank completed its previously-announced 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. (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. Upon consummation, the Branches were merged with and into FirstBank, consolidating three of the purchased branches across the existing bank footprint. Under the terms of the agreement, the Bank assumed $588,877 in deposits for a premium of 6.25% and acquired $ 374,966 in loans at 99.32% of principal outstanding. The acquisition of the Branches was accounted for in accordance with ASC Topic "Business Combinations." Accordingly, the assets and liabilities, both tangible and intangible, were recorded at their estimated fair values as of the acquisition date. The Company is finalizing the fair value of acquired assets and liabilities assumed and as such, purchase accounting is not yet complete. Goodwill of $ 31,396 recorded in connection with the transaction resulted from the ongoing business contribution of the Branches. The Company incurred $199 and $4,614 in merger expenses during the three and nine months ended September 30, 2019 , respectively, in connection with this transaction. These expenses are primarily comprised of professional services and employee-related costs in addition to branch closings and conversion and integration costs. The following tables present the preliminary fair values of assets acquired and liabilities assumed as of the April 5, 2019 acquisition date and an allocation of the consideration to net assets acquired: As of April 5, 2019 As Recorded by FB Financial Corporation (1) Assets Cash and cash equivalents (1) $ 207,822 Loans, net of fair value adjustments 374,966 Premises and equipment 9,650 Operating lease right-of-use assets 4,133 Core deposit intangible 10,760 Accrued interest and other assets 1,271 Total assets $ 608,602 Liabilities Deposits Noninterest-bearing $ 118,405 Interest-bearing checking 112,225 Money markey and savings 211,135 Customer time deposits 147,112 Total deposits 588,877 Customer repurchase agreements 9,572 Operating lease liabilities 4,133 Accrued expenses and other liabilities 626 Total liabilities 603,208 Total net assets acquired $ 5,394 (1) Cash and cash equivalents were reduced in settlement by the deposit premium paid of $36,790 to reflect net cash received of $171,032 . Consideration: Deposit premium $ 36,790 Preliminary allocation of consideration: Fair value of net assets acquired $ 5,394 Goodwill (preliminary) 31,396 Total consideration $ 36,790 The following table presents the fair value of acquired purchased credit impaired loans accounted for in accordance with ASC 310-30 "Loans and Debt Securities Acquired with Deteriorated Credit Quality" from the Atlantic Capital branch acquisition as of the acquisition date: April 5, 2019 Contractually-required principal and interest $ 11,374 Nonaccretable difference 1,615 Best estimate of contractual cash flows expected to be collected 9,759 Accretable yield 1,167 Fair value $ 8,592 The following unaudited pro forma condensed consolidated financial information presents the results of operations for the three and nine months ended September 30, 2019 and 2018 as though the merger had been completed as of January 1, 2018. The unaudited estimated pro forma information combines the historical results of the Branches 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 acquisition taken place on January 1, 2018 and does not include the effect of all cost-saving or revenue-enhancing strategies. Three months ended September 30, Nine months ended September 30, 2019 2018 2019 2018 Net interest income $ 58,305 $ 56,522 $ 171,915 $ 165,209 Total revenues $ 96,450 $ 91,688 $ 272,868 $ 271,099 Net income $ 23,966 $ 20,283 $ 59,745 $ 60,680 Due to the timing of the data conversion and the integration of operations of the Branches onto the Company's existing operations, historical reporting of the acquired Branches is impracticable, and therefore, disclosure of the amounts of revenue and expenses from the acquired Branches since the acquisition date are not available.

Investment securities

Investment securities	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Investment securities	Investment securities: The amortized cost of securities and their fair values at September 30, 2019 and December 31, 2018 are shown below: September 30, 2019 Amortized cost Gross unrealized gains Gross unrealized losses Fair Value Investment Securities Available-for-sale debt securities U.S. government agency securities $ 1,000 $ — $ (1 ) $ 999 Mortgage-backed securities - residential 481,580 5,784 (2,064 ) 485,300 Municipals, tax exempt 165,100 8,754 (69 ) 173,785 Treasury securities 7,415 17 — 7,432 Corporate securities 1,000 15 — 1,015 Total $ 656,095 $ 14,570 $ (2,134 ) $ 668,531 December 31, 2018 Amortized cost Gross unrealized gains Gross unrealized losses Fair Value Investment Securities Available-for-sale debt securities U.S. government agency securities $ 1,000 $ — $ (11 ) $ 989 Mortgage-backed securities - residential 520,654 1,191 (13,265 ) 508,580 Municipals, tax exempt 138,994 1,565 (1,672 ) 138,887 Treasury securities 7,385 — (143 ) 7,242 Total $ 668,033 $ 2,756 $ (15,091 ) $ 655,698 As of September 30, 2019 and December 31, 2018, the Company had $3,250 and $ 3,107 in marketable equity securities recorded at fair value, respectively. Securities pledged at September 30, 2019 and December 31, 2018 had carrying amounts of $ 329,681 and $ 326,215 , 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 September 30, 2019 and December 31, 2018 , there were $ 3,671 and $ 2,120 , respectively, in trade date payables that related to purchases settled after period end. The amortized cost and fair value of debt securities by contractual maturity at September 30, 2019 and December 31, 2018 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. September 30, 2019 December 31, 2018 Available-for-sale Available-for-sale Amortized cost Fair value Amortized cost Fair value Due in one year or less $ 5,292 $ 5,312 $ 15,883 $ 16,028 Due in one to five years 12,477 12,601 13,806 13,740 Due in five to ten years 15,412 15,978 18,539 18,387 Due in over ten years 141,334 149,340 99,151 98,963 174,515 183,231 147,379 147,118 Mortgage-backed securities - residential 481,580 485,300 520,654 508,580 Total debt securities $ 656,095 $ 668,531 $ 668,033 $ 655,698 Sales and other dispositions of available-for-sale securities were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Proceeds from sales $ 22,740 $ — $ 24,498 $ 221 Proceeds from maturities, prepayments and calls 28,694 20,068 78,861 54,576 Gross realized gains 1 — 7 1 Gross realized losses 76 — 83 9 Additionally, net gains on the change in fair value of equity securities of $55 and $151 were recognized during the three and nine months ended September 30, 2019 , respectively. Net losses on the change in fair value of equity securities of $27 and $108 were recognized in the three and nine months ended September 30, 2018 , respectively. The following tables show gross unrealized losses at September 30, 2019 and December 31, 2018 , aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position: September 30, 2019 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 $ — $ — $ 999 $ (1 ) $ 999 $ (1 ) Mortgage-backed securities - residential 26,610 (70 ) 217,385 (1,994 ) 243,995 (2,064 ) Municipals, tax exempt 10,553 (69 ) — — 10,553 (69 ) Treasury securities — — — — — — Total $ 37,163 $ (139 ) $ 218,384 $ (1,995 ) $ 255,547 $ (2,134 ) December 31, 2018 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 $ — $ — $ 989 $ (11 ) $ 989 $ (11 ) Mortgage-backed securities - residential 60,347 (478 ) 335,769 (12,787 ) 396,116 (13,265 ) Municipals, tax exempt 27,511 (366 ) 25,343 (1,306 ) 52,854 (1,672 ) Treasury securities — — 7,242 (143 ) 7,242 (143 ) Total $ 87,858 $ (844 ) $ 369,343 $ (14,247 ) $ 457,201 $ (15,091 ) As of September 30, 2019 and December 31, 2018 , the Company’s securities portfolio consisted of 359 and 360 securities, 57 and 174 of which were in an unrealized loss position, respectively. The Company evaluates available-for-sale debt securities with unrealized losses for other-than-temporary impairment ("OTTI") on a quarterly basis and recorded no OTTI for the three and nine months ended September 30, 2019 and 2018 . The Company considers an investment security impaired if the fair value of the security is less than its cost or amortized cost basis. For debt securities, the unrealized losses associated with these investment securities are primarily driven by interest rates and are not due to the credit quality of the securities. The Company currently does not intend to sell those investments with unrealized losses, and it is unlikely that the Company will be required to sell the investments before recovery of their amortized cost basis, which may be maturity.

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2019
Receivables [Abstract]
Loans and allowance for loan losses	Loans and allowance for loan losses: Loans outstanding at September 30, 2019 and December 31, 2018 , by major lending classification are as follows: September 30, December 31, 2019 2018 Commercial and industrial $ 997,921 $ 867,083 Construction 537,784 556,051 Residential real estate: 1-to-4 family mortgage 710,077 555,815 Residential line of credit 215,493 190,480 Multi-family mortgage 80,352 75,457 Commercial real estate: Owner occupied 620,635 493,524 Non-owner occupied 914,502 700,248 Consumer and other 268,580 228,853 Gross loans 4,345,344 3,667,511 Less: Allowance for loan losses (31,464 ) (28,932 ) Net loans $ 4,313,880 $ 3,638,579 As of September 30, 2019 and December 31, 2018 , $ 527,351 and $ 618,976 , respectively, of qualifying residential mortgage loans (including loans held for sale) and $ 521,754 and $ 608,735 , 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. As of September 30, 2019 and December 31, 2018 , $ 1,403,511 and $ 1,336,092 , respectively, of qualifying loans were pledged to the Federal Reserve Bank under the Borrower-in-Custody program. As of September 30, 2019 and December 31, 2018 , the carrying value of purchased credit impaired loans (“PCI”) loans accounted for under ASC 310-30 "Loans and Debt Securities Acquired with Deteriorated Credit Quality", were $ 63,069 and $ 68,999 , respectively. The following table presents changes in the value of the accretable yield for PCI loans for the periods indicated. Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Balance at the beginning of period $ (14,862 ) $ (20,169 ) $ (16,587 ) $ (17,682 ) Additions through the branch acquisition of Atlantic Capital Bank — — (1,167 ) — Principal reductions and other reclassifications from nonaccretable difference (150 ) (84 ) 100 (3,536 ) Accretion 1,583 2,103 5,471 6,943 Changes in expected cash flows 110 6 (1,136 ) (3,869 ) Balance at end of period $ (13,319 ) $ (18,144 ) $ (13,319 ) $ (18,144 ) Included in the ending balance of the accretable yield on PCI loans at September 30, 2019 and December 31, 2018 , is a purchase accounting liquidity discount of $ 781 and $2,436 , respectively. There is also a purchase accounting nonaccretable credit discount of $4,331 and $4,355 related to the PCI loan portfolio at September 30, 2019 and December 31, 2018 , respectively, and an accretable credit and liquidity discount on non-PCI loans of $ 10,075 and $ 4,483 as of September 30, 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, is being recognized on all PCI loans. Accretion of interest income on PCI loans amounted to $ 1,583 and $ 5,471 during the three and nine months ended September 30, 2019 , respectively, and $ 2,103 and $ 6,943 during the three and nine months ended September 30, 2018 , respectively. This includes 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 $ 2,102 and $ 6,030 for the three and nine months ended September 30, 2019 , respectively, and $ 2,130 and $5,745 for the three and nine months ended September 30, 2018 , respectively. The following provides the changes in the allowance for loan losses by portfolio segment for the three and nine months ended September 30, 2019 and 2018 : 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 Three Months Ended September 30, 2019 Beginning balance - $ 4,923 $ 9,655 $ 3,288 $ 755 $ 617 $ 3,512 $ 4,478 $ 2,910 $ 30,138 Provision for loan losses 234 186 18 67 (43 ) 194 461 714 1,831 Recoveries of loans 16 1 25 75 — 3 — 92 212 Loans charged off (3 ) — — (170 ) — — (12 ) (532 ) (717 ) Ending balance - $ 5,170 $ 9,842 $ 3,331 $ 727 $ 574 $ 3,709 $ 4,927 $ 3,184 $ 31,464 Nine Months Ended September 30, 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 17 105 (77 ) 100 8 482 790 2,678 4,103 Recoveries of loans previously charged-off 66 8 62 121 — 95 — 435 787 Loans charged off (261 ) — (82 ) (305 ) — — (12 ) (1,698 ) (2,358 ) Ending balance - September 30, 2019 $ 5,170 $ 9,842 $ 3,331 $ 727 $ 574 $ 3,709 $ 4,927 $ 3,184 $ 31,464 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 Three Months Ended September 30, 2018 Beginning balance - $ 4,747 $ 9,023 $ 3,378 $ 795 $ 391 $ 3,290 $ 3,272 $ 1,451 $ 26,347 Provision for loan losses 847 (754 ) 47 25 292 236 639 486 1,818 Recoveries of loans 104 13 99 31 — 10 — 103 360 Loans charged off (333 ) (14 ) (4 ) (13 ) — (55 ) — (498 ) (917 ) Ending balance - $ 5,365 $ 8,268 $ 3,520 $ 838 $ 683 $ 3,481 $ 3,911 $ 1,542 $ 27,608 Nine Months Ended September 30, 2018 Beginning balance - December 31, 2017 $ 4,461 $ 7,135 $ 3,197 $ 944 $ 434 $ 3,558 $ 2,817 $ 1,495 $ 24,041 Provision for loan losses 1,088 35 235 (175 ) 249 (163 ) 1,043 886 3,198 Recoveries of loans previously charged-off 374 1,127 157 102 — 141 51 416 2,368 Loans charged off (558 ) (29 ) (69 ) (33 ) — (55 ) — (1,255 ) (1,999 ) Ending balance - $ 5,365 $ 8,268 $ 3,520 $ 838 $ 683 $ 3,481 $ 3,911 $ 1,542 $ 27,608 The following tables provides the allocation of the allowance for loan losses by loan category broken out between loans individually evaluated for impairment, loans collectively evaluated for impairment and loans acquired with deteriorated credit quality as of September 30, 2019 and December 31, 2018 : September 30, 2019 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 Amount of allowance allocated to: Individually evaluated for impairment $ 13 $ — $ 11 $ — $ — $ 52 $ 405 $ 254 $ 735 Collectively evaluated for impairment 5,064 9,796 3,173 727 574 3,641 4,225 1,967 29,167 Acquired with deteriorated credit quality 93 46 147 — — 16 297 963 1,562 Ending balance - September 30, 2019 $ 5,170 $ 9,842 $ 3,331 $ 727 $ 574 $ 3,709 $ 4,927 $ 3,184 $ 31,464 December 31, 2018 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 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 tables provides the amount of loans by loan category broken between loans individually evaluated for impairment, loans collectively evaluated for impairment and loans acquired with deteriorated credit quality as of September 30, 2019 and December 31, 2018 : September 30, 2019 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 Loans, net of unearned income Individually evaluated for impairment $ 3,834 $ 2,061 $ 1,346 $ 245 $ — $ 2,476 $ 7,846 $ 459 $ 18,267 Collectively evaluated for impairment 992,463 532,521 687,748 215,175 80,352 612,112 894,468 249,169 4,264,008 Acquired with deteriorated credit quality 1,624 3,202 20,983 73 — 6,047 12,188 18,952 63,069 Ending balance - September 30, 2019 $ 997,921 $ 537,784 $ 710,077 $ 215,493 $ 80,352 $ 620,635 $ 914,502 $ 268,580 $ 4,345,344 December 31, 2018 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 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 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 individually by classifying the loans as to credit risk. The Company uses the following definitions for risk ratings: Watch. Loans rated as watch includes loans in which management believes conditions have occurred, or may occur, which could result in the loan being downgraded to a worse rated 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. Also included in this category are loans considered doubtful, which have all the weaknesses previously described and management believes those weaknesses may make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. Loans not meeting the criteria above are considered to be pass rated loans. The following tables show credit quality indicators by portfolio class at September 30, 2019 and December 31, 2018 : September 30, 2019 Pass Watch Substandard Total Loans, excluding purchased credit impaired loans Commercial and industrial $ 930,094 $ 49,209 $ 16,994 $ 996,297 Construction 528,358 4,074 2,150 534,582 Residential real estate: 1-to-4 family mortgage 666,942 8,254 13,898 689,094 Residential line of credit 212,556 1,171 1,693 215,420 Multi-family mortgage 80,285 67 — 80,352 Commercial real estate: Owner occupied 574,582 25,962 14,044 614,588 Non-owner occupied 868,007 25,597 8,710 902,314 Consumer and other 243,495 3,315 2,818 249,628 Total loans, excluding purchased credit impaired loans $ 4,104,319 $ 117,649 $ 60,307 $ 4,282,275 Purchased credit impaired loans Commercial and industrial $ — $ 1,023 $ 601 $ 1,624 Construction — 2,994 208 3,202 Residential real estate: 1-to-4 family mortgage — 16,540 4,443 20,983 Residential line of credit — — 73 73 Multi-family mortgage — — — — Commercial real estate: Owner occupied — 4,244 1,803 6,047 Non-owner occupied — 5,620 6,568 12,188 Consumer and other — 14,074 4,878 18,952 Total purchased credit impaired loans $ — $ 44,495 $ 18,574 $ 63,069 Total loans $ 4,104,319 $ 162,144 $ 78,881 $ 4,345,344 December 31, 2018 Pass Watch Substandard Total Loans, excluding purchased credit impaired loans Commercial and industrial $ 804,447 $ 52,624 $ 8,564 $ 865,635 Construction 543,953 5,012 1,331 550,296 Residential real estate: 1-to-4 family mortgage 519,541 8,697 8,200 536,438 Residential line of credit 186,753 1,039 2,688 190,480 Multi-family mortgage 75,381 76 — 75,457 Commercial real estate: Owner occupied 456,694 16,765 14,049 487,508 Non-owner occupied 667,447 8,881 7,654 683,982 Consumer and other 204,279 2,763 1,674 208,716 Total loans, excluding purchased credit impaired loans $ 3,458,495 $ 95,857 $ 44,160 $ 3,598,512 Purchased credit impaired loans Commercial and industrial $ — $ 964 $ 484 $ 1,448 Construction — 3,229 2,526 5,755 Residential real estate: 1-to-4 family mortgage — 14,681 4,696 19,377 Residential line of credit — — — — Multi-family mortgage — — — — Commercial real estate: Owner occupied — 4,110 1,906 6,016 Non-owner occupied — 8,266 8,000 16,266 Consumer and other — 15,422 4,715 20,137 Total purchased credit impaired loans $ — $ 46,672 $ 22,327 $ 68,999 Total loans $ 3,458,495 $ 142,529 $ 66,487 $ 3,667,511 Nonperforming loans include loans that are no longer accruing interest (nonaccrual loans) and loans past due ninety or more days and still accruing interest. Nonperforming loans and impaired loans are defined differently. Some loans may be included in both categories, whereas other loans may only be included in one category. PCI loans are considered past due or delinquent when the contractual principal or interest due in accordance with the terms of the loan agreement remains unpaid after the due date of the scheduled payment. However, these loans are considered to be performing, even though they may be contractually past due, as any non-payment of contractual principal or interest is considered in the periodic re-estimation of expected cash flows and is included in the resulting recognition of current period covered loan loss provision or future period yield adjustments. As such, PCI loans are excluded from past due disclosures presented below. The accrual and/or accretion of interest is discontinued on PCI loans if management can no longer reliably estimate future cash flows on the loan. No PCI loans were classified as nonaccrual at September 30, 2019 or December 31, 2018 as the present value of the respective loan or pool of loans cash flows were considered estimable and probable of collection. Therefore, interest income, through accretion of the difference between the carrying value of the loans and the expected cash flows, is being recognized on all PCI loans. PCI contractually past due 30-89 days amounted to $3,598 and $3,605 as of September 30, 2019 and December 31, 2018 , respectively, and an additional $754 and $4,076 were contractually past due 90 days or more as of September 30, 2019 and December 31, 2018 , respectively. The following tables provide the period-end amounts of loans that are past due thirty to eighty-nine days, past due ninety or more days and still accruing interest, loans not accruing interest and loans current on payments accruing interest by category at September 30, 2019 and December 31, 2018 : September 30, 2019 30-89 days past due 90 days or more and accruing interest Non-accrual loans Purchased Credit Impaired loans Loans current on payments and accruing interest Total Commercial and industrial $ 3,892 $ 4 $ 383 $ 1,624 $ 992,018 $ 997,921 Construction 327 — 1,107 3,202 533,148 537,784 Residential real estate: 1-to-4 family mortgage 5,552 1,316 7,260 20,983 674,966 710,077 Residential line of credit 475 298 421 73 214,226 215,493 Multi-family mortgage — — — — 80,352 80,352 Commercial real estate: Owner occupied 153 — 1,274 6,047 613,161 620,635 Non-owner occupied 2,605 5 6,596 12,188 893,108 914,502 Consumer and other 2,446 829 870 18,952 245,483 268,580 Total $ 15,450 $ 2,452 $ 17,911 $ 63,069 $ 4,246,462 $ 4,345,344 December 31, 2018 30-89 days past due 90 days or more and accruing interest Non-accrual loans Purchased Credit Impaired loans Loans current on payments and accruing interest Total Commercial and industrial $ 999 $ 65 $ 438 $ 1,448 $ 864,133 $ 867,083 Construction 109 — 283 5,755 549,904 556,051 Residential real estate: 1-to-4 family mortgage 4,919 737 2,704 19,377 528,078 555,815 Residential line of credit 726 957 804 — 187,993 190,480 Multi-family mortgage — — — — 75,457 75,457 Commercial real estate: Owner occupied 407 197 2,423 6,016 484,481 493,524 Non-owner occupied 61 77 6,885 16,266 676,959 700,248 Consumer and other 1,987 1,008 148 20,137 205,573 228,853 Total $ 9,208 $ 3,041 $ 13,685 $ 68,999 $ 3,572,578 $ 3,667,511 Impaired loans recognized in conformity with ASC 310 at September 30, 2019 and December 31, 2018 , segregated by class, were as follows: September 30, 2019 Recorded investment Unpaid principal Related allowance With a related allowance recorded: Commercial and industrial $ 3,081 $ 3,081 $ 13 Residential real estate: 1-to-4 family mortgage 264 324 11 Commercial real estate: Owner occupied 182 220 52 Non-owner occupied 6,796 6,831 405 Consumer and other 395 395 254 Total $ 10,718 $ 10,851 $ 735 With no related allowance recorded Commercial and industrial $ 753 $ 898 $ — Construction 2,061 2,484 — Residential real estate: 1-to-4 family mortgage 1,082 1,400 — Residential line of credit 245 262 — Commercial real estate: Owner occupied 2,294 3,437 — Non-owner occupied 1,050 1,781 — Consumer and other 64 64 — Total $ 7,549 $ 10,326 $ — Total impaired loans $ 18,267 $ 21,177 $ 735 December 31, 2018 Recorded investment Unpaid principal Related allowance With a related allowance recorded: Commercial and industrial $ 618 $ 732 $ 3 Residential real estate: 1-to-4 family mortgage 145 145 7 Commercial real estate: Owner occupied 560 641 53 Non-owner occupied 5,686 5,686 205 Total $ 7,009 $ 7,204 $ 268 With no related allowance recorded: Commercial and industrial $ 1,229 $ 1,281 $ — Construction 1,221 1,262 — Residential real estate: 1-to-4 family mortgage 842 1,151 — Residential line of credit 245 249 — Commercial real estate: Owner occupied 2,048 2,780 — Non-owner occupied 1,049 1,781 — Consumer and other 73 73 — Total $ 6,707 $ 8,577 $ — Total impaired loans $ 13,716 $ 15,781 $ 268 Average recorded investment and interest income on a cash basis recognized during the three and nine months ended September 30, 2019 and 2018 on impaired loans, segregated by class, were as follows: Three Months Ended Nine Months Ended September 30, 2019 Average recorded investment Interest income recognized (cash basis) Average recorded investment Interest income recognized (cash basis) With a related allowance recorded: Commercial and industrial $ 3,109 $ 51 $ 1,850 $ 156 Construction — — — — Residential real estate: 1-to-4 family mortgage 265 2 205 13 Residential line of credit — — — — Multi-family mortgage — — — — Commercial real estate: Owner occupied 184 4 371 10 Non-owner occupied 6,143 56 6,241 90 Consumer and other 447 — 198 19 Total $ 10,148 $ 113 $ 8,865 $ 288 With no related allowance recorded: Commercial and industrial $ 766 $ 11 $ 991 $ 36 Construction 1,639 90 1,641 142 Residential real estate: 1-to-4 family mortgage 835 24 962 50 Residential line of credit 427 — 245 2 Multi-family mortgage — — — — Commercial real estate: Owner occupied 2,045 41 2,171 103 Non-owner occupied 1,050 — 1,050 — Consumer and other 66 2 69 5 Total $ 6,828 $ 168 $ 7,129 $ 338 Total impaired loans $ 16,976 $ 281 $ 15,994 $ 626 September 30, 2018 With a related allowance recorded: Commercial and industrial $ 922 $ 81 $ 872 $ 84 Residential real estate: 1-to-4 family mortgage 186 2 189 7 Commercial real estate: Owner occupied 661 7 706 34 Non-owner occupied — — 72 2 Total $ 1,769 $ 90 $ 1,839 $ 127 With no related allowance recorded: Commercial and industrial $ 1,983 $ 21 $ 1,729 $ 80 Construction 1,279 35 1,283 70 Residential real estate: 1-to-4 family mortgage 1,313 15 1,189 60 Residential line of credit 127 8 127 8 Multi-family mortgage 569 2 583 26 Commercial real estate: Owner occupied 1,490 27 1,572 87 Non-owner occupied 1,049 — 1,313 7 Consumer and other 54 1 53 2 Total $ 7,864 $ 109 $ 7,849 $ 340 Total impaired loans $ 9,633 $ 199 $ 9,688 $ 467 As of September 30, 2019 and December 31, 2018 , the Company has a recorded investment in troubled debt restructurings of $11,460 and $ 6,794 , respectively. The modifications included extensions of the maturity date and/or a stated rate of interest to one lower than the current market rate. The Company has allocated $171 and $ 63 of specific reserves for those loans at September 30, 2019 and December 31, 2018 , respectively. There were no commitments to lend any additional amounts to these customers for either period end. Of these loans, $3,211 and $ 2,703 were classified as non-accrual loans as of September 30, 2019 and December 31, 2018 , respectively. The following tables present the financial effect of TDRs recorded during the periods indicated. Three Months Ended September 30, 2019 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial and industrial 1 $ 16 $ 16 $ — Construction 1 1,070 1,070 — Commercial real estate: Owner occupied 1 927 927 — Non-owner occupied 1 1,366 1,366 106 Residential real estate: 1-to-4 family mortgage 1 128 128 — Total 5 $ 3,507 $ 3,507 $ 106 Three Months Ended September 30, 2018 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial real estate: Owner occupied 1 $ 143 $ 143 $ — Consumer and other 4 55 55 — Total 5 $ 198 $ 198 $ — Nine Months Ended September 30, 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 1 1,070 1,070 — Commercial real estate: Owner occupied 1 927 927 — Non-owner occupied 1 1,366 1,366 106 Residential real estate: 1-to-4 family mortgage 1 128 128 — Total 7 $ 6,695 $ 6,695 $ 106 Nine Months Ended September 30, 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 three or nine months ended September 30, 2019 and 2018 . A loan is considered to be in payment default once it is 90 days contractually past due under the modified terms. The terms of certain other loans were modified during the three and nine months ended September 30, 2019 and 2018 that did not meet the definition of a troubled debt restructuring. The modification of these loans involved either a modification of the terms of a loan to borrowers who were not experiencing financial difficulties or a delay in a payment that was considered to be insignificant. 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.

Other Real Estate Owned

Other Real Estate Owned	9 Months Ended
	Sep. 30, 2019
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 three and nine months ended September 30, 2019 and 2018 : Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Balance at beginning of period $15,521 $ 14,639 $ 12,643 $ 16,442 Transfers from loans 1,535 476 3,565 1,490 Transfers from premises and equipment — — 2,640 — Proceeds from sale of other real estate owned (854 ) (1,457 ) (2,718 ) (3,666 ) Gain on sale of other real estate owned 260 205 582 213 Loans provided for sales of other real estate owned — (191 ) (166 ) (636 ) Write-downs and partial liquidations (386 ) (85 ) (470 ) (256 ) Balance at end of period $16,076 $ 13,587 $ 16,076 $ 13,587 Foreclosed residential real estate properties included in the table above totaled $3,066 and $2,101 as of September 30, 2019 and December 31, 2018 , respectively. The recorded investment in residential mortgage loans secured by residential real estate properties for which foreclosure proceedings are in process totaled $867 and $478 at September 30, 2019 and December 31, 2018 , respectively. Excess land and facilities held for sale resulting from branch consolidations totaled $ 7,305 as of September 30, 2019 , including $ 891 acquired in the Atlantic Capital branch acquisition, and $5,381 as of December 31, 2018, respectively.

Goodwill and intangible assets

Goodwill and intangible assets	9 Months Ended
	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and intangible assets	Goodwill and intangible assets: The following table summarizes changes in goodwill during the nine months ended September 30, 2019 . There was no such activity during the nine months ended September 30, 2018 . Goodwill Balance at December 31, 2018 $ 137,190 Addition from acquisition of Atlantic Capital branches (see Note 2) 31,396 Impairment due to sale of third party origination ("TPO") mortgage delivery channel (100 ) Balance at September 30, 2019 $ 168,486 Goodwill is tested annually, or more often if circumstances warrant, for impairment. If the implied fair value of goodwill is lower than its carrying amount, goodwill impairment is indicated and is written down to its implied fair value. Subsequent increases in goodwill values are not recognized in the financial statements. Goodwill impairment of $ 100 for the nine months ended September 30, 2019 is related to the goodwill assigned to the third party origination channel in the Mortgage segment, which was sold during the second quarter of 2019. There were no additions or impairment recorded during the nine months ended September 30, 2018 . Core deposit and other intangibles include core deposit intangibles, customer base trust intangible and manufactured housing servicing intangible. The change in core deposit and other intangibles during the three and nine months ended September 30, 2019 and 2018 is as follows: Core deposit and other intangibles Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Beginning Balance $ 19,945 $ 13,203 $ 11,628 $ 14,902 Addition of core deposit intangible from acquisition of Atlantic Capital branches (see Note 2) — — 10,760 — Reclassification of leasehold intangible (1) — — (460 ) — Less: amortization expense (2) (1,197 ) (800 ) (3,180 ) (2,499 ) Ending Balance $ 18,748 $ 12,403 $ 18,748 $ 12,403 (1) The Company adopted ASU 2016-02 "Leases" (Topic 842) on January 1, 2019 and reclassified $460 of leasehold intangibles to Operating lease right-of-use asset. (2) The three and nine months ended September 30, 2018 includes $23 and $67 , respectively, of amortization expense related to leasehold intangibles included in occupancy and equipment expense. During the second quarter of 2019, the Company recorded $10,760 of core deposit intangibles resulting from the Atlantic Capital branch acquisition, which is being amortized over a weighted average life of approximately 6 years . The estimated aggregate future amortization expense of the core deposit and other intangibles is as follows: Remainder of 2019 $ 1,159 December 31, 2020 4,262 December 31, 2021 3,663 December 31, 2022 2,973 December 31, 2023 2,247 Thereafter 4,444 $ 18,748

Leases

Leases	9 Months Ended
	Sep. 30, 2019
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 September 30, 2019 , the Company had 42 operating leases with terms greater than one year to 37 years. Leases with initial terms of less than one year are not recorded on the balance sheet. The Company elected not to include equipment leases and leases in which the Company is the lessor on the consolidated balance sheets as these are not material. Most 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 are included in the ROU asset and lease liability. Information related to the Company's operating leases is presented below: September 30, 2019 Right-of-use assets $ 34,812 Lease liabilities 37,760 Weighted average remaining lease term (in years) 14.43 Weighted average discount rate 3.46 % The components of lease expense included in Occupancy and equipment expense were as follows: Three Months Ended Nine Months Ended September 30, 2019 September 30, 2019 Operating lease cost $ 1,260 $ 3,875 Short-term lease cost 81 239 Variable lease cost 146 580 Total lease cost $ 1,487 $ 4,694 As the Company elected, for all classes of underlying assets, not to separate lease and non-lease components and instead to account for them as a single lease component, the variable lease cost primarily represents variable payments such as common area maintenance, utilities, and property taxes. Lease expense for the three and nine months ended September 30, 2018 , prior to the adoption of ASU 2016-02, was $1,295 and $3,786 , respectively. A maturity analysis of operating lease liabilities and a reconciliation of undiscounted cash flows to the total operating lease liability is as follows: September 30, 2019 Lease payments due on or before: September 30, 2020 $ 5,537 September 30, 2021 5,244 September 30, 2022 4,523 September 30, 2023 3,996 September 30, 2024 3,578 Thereafter 26,396 Total undiscounted cash flows 49,274 Discount on cash flows (11,514 ) Total lease liability $ 37,760

Mortgage servicing rights

Mortgage servicing rights	9 Months Ended
	Sep. 30, 2019
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 three and nine months ended September 30, 2019 and 2018 : Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Carrying value at beginning of period $ 66,380 $ 109,449 $ 88,829 $ 76,107 Capitalization 10,387 11,741 30,319 41,555 Sales — (39,428 ) (29,160 ) (39,428 ) Change in fair value: Due to pay-offs/pay-downs (5,050 ) (3,339 ) (10,150 ) (8,606 ) Due to change in valuation inputs or assumptions (5,561 ) 1,467 (13,682 ) 10,262 Carrying value at period end $ 66,156 $ 79,890 $ 66,156 $ 79,890 The following table summarizes servicing income and expense included in mortgage banking income and other noninterest expense within the Mortgage Segment operating results, respectively, for the three and nine months ended September 30, 2019 and 2018 , respectively: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Servicing income: Servicing income $ 3,960 $ 5,576 $ 12,763 $ 15,973 Change in fair value of mortgage servicing rights (10,611 ) (1,872 ) (23,832 ) 1,656 Change in fair value of derivative hedging instruments 5,520 (829 ) 13,060 (7,848 ) Servicing income (1,131 ) 2,875 1,991 9,781 Servicing expenses 1,732 2,114 4,961 5,987 Net servicing (loss) income (1) $ (2,863 ) $ 761 $ (2,970 ) $ 3,794 (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 September 30, 2019 and December 31, 2018 are as follows: September 30, December 31, 2019 2018 Unpaid principal balance $ 6,297,723 $ 6,755,114 Weighted-average prepayment speed (CPR) 11.64 % 8.58 % Estimated impact on fair value of a 10% increase $ (2,743 ) $ (2,072 ) Estimated impact on fair value of a 20% increase $ (5,278 ) $ (4,006 ) Discount rate 8.58 % 10.45 % Estimated impact on fair value of a 100 bp increase $ (2,568 ) $ (2,505 ) Estimated impact on fair value of a 200 bp increase $ (4,946 ) $ (4,807 ) Weighted-average coupon interest rate 4.32 % 4.21 % Weighted-average servicing fee (basis points) 29 30 Weighted-average remaining maturity (in months) 336 325 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 11, "Derivatives" for additional information on these hedging instruments. From time to time, the Company enters agreements to sell certain tranches of mortgage servicing rights. Upon consummation of the sale, the Company generally continues to subservice the underlying mortgage loans until they can be transferred to the purchaser. During the nine months ended September 30, 2019 , the Company sold $29,160 of mortgage servicing rights on $2,034,374 of serviced mortgage loans. No material gain or loss was recognized in connection with this transaction. During the nine months ended September 30, 2018 , the Company sold $ 39,428 of mortgage servicing rights on $ 3,181,483 of serviced mortgages. There was not a material gain or loss recognized in this transaction. As of September 30, 2019 and September 30, 2018 , there were no loans being serviced that related to the bulk sale of mortgage servicing rights. As of September 30, 2019 and December 31, 2018 , mortgage escrow deposits totaled to $ 121,400 and $53,468 , respectively.

Income taxes

Income taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income taxes	Income taxes: An allocation of federal and state income taxes between current and deferred portions is presented below: Three Months Ended September 30, 2019 2018 Current $ 9,167 $ 13,367 Deferred (1,449 ) (6,665 ) Total $ 7,718 $ 6,702 Nine Months Ended September 30, 2019 2018 Current $ 25,907 $ 15,562 Deferred (5,900 ) 4,416 Total $ 20,007 $ 19,978 Federal income tax expense differs from the statutory federal rate of 21% for the three and nine months ended September 30, 2019 and 2018 due to the following: Three Months Ended September 30, 2019 2018 Federal taxes calculated at statutory rate $ 6,653 21.0 % $ 5,897 21.0 % Increase (decrease) resulting from: State taxes, net of federal benefit 1,512 4.7 % 1,187 4.2 % Benefit of equity based compensation (275 ) (0.9 )% (115 ) (0.4 )% Municipal interest income, net of interest disallowance (211 ) (0.7 )% (213 ) (0.8 )% Bank owned life insurance (11 ) 0.1 % (13 ) — % Other 50 0.2 % (41 ) (0.1 )% Income tax expense, as reported $ 7,718 24.4 % $ 6,702 23.9 % Nine Months Ended September 30, 2019 2018 Federal taxes calculated at statutory rate $ 17,272 21.0 % $ 17,467 21.0 % Increase (decrease) resulting from: State taxes, net of federal benefit 3,855 4.7 % 3,873 4.6 % Benefit of equity based compensation (668 ) (0.8 )% (866 ) (1.0 )% Municipal interest income, net of interest disallowance (650 ) (0.8 )% (621 ) (0.8 )% Bank owned life insurance (38 ) (0.1 )% (38 ) (0.1 )% Stock offering costs — — % 141 0.2 % Other 236 0.3 % 22 0.1 % Income tax expense, as reported $ 20,007 24.3 % $ 19,978 24.0 % The components of the net deferred tax liability at September 30, 2019 and December 31, 2018 , are as follows: September 30, December 31, 2019 2018 Deferred tax assets: Allowance for loan losses $ 8,198 $ 7,539 Operating lease liability 9,839 — Amortization of core deposit intangible 1,273 1,012 Deferred compensation 5,891 5,878 Unrealized loss on available-for-sale debt securities 115 3,299 Other 2,451 1,998 Subtotal 27,767 19,726 Deferred tax liabilities: FHLB stock dividends (550 ) (550 ) Operating lease - right of use asset (9,514 ) — Depreciation (4,466 ) (4,812 ) Cash flow hedges (3,418 ) (736 ) Mortgage servicing rights (17,342 ) (23,146 ) Goodwill (8,244 ) (6,583 ) Other (901 ) (562 ) Subtotal (44,435 ) (36,389 ) Net deferred tax liability $ (16,668 ) $ (16,663 ) Tax periods for all fiscal years after 2014 remain open to examination by the federal and state taxing jurisdictions to which the Company is subject.

Commitments and contingencies

Commitments and contingencies	9 Months Ended
	Sep. 30, 2019
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 to 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. September 30, December 31, 2019 2018 Commitments to extend credit, excluding interest rate lock commitments $ 1,188,160 $ 1,032,390 Letters of credit 22,376 19,024 Balance at end of period $ 1,210,536 $ 1,051,414 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 $ 1,165 and $4,675 for the three and nine months ended September 30, 2019 , respectively, and $2,322 and $4,984 for the three and nine months ended September 30, 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: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Balance at beginning of period $ 3,407 $ 3,646 $ 3,273 $ 3,386 Provision for loan repurchases or indemnifications 107 206 255 598 Recoveries on previous losses (79 ) (115 ) (93 ) (247 ) Balance at end of period $ 3,435 $ 3,737 $ 3,435 $ 3,737

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2019
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 up to sixty 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. These contracts had a negative fair value of $837 at September 30, 2019 and a positive fair value of $721 at December 31, 2018 . 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 and five years, respectively. These interest rate swaps were designated as cash flow hedges with the objective of reducing the variability of cash flows associated with $100,000 of FHLB borrowings obtained in conjunction with the Clayton Banks acquisition. During the first quarter of 2018, these swaps were canceled, locking in a tax-adjusted gain of $1,564 in other comprehensive income to be accreted over the three, four and five-year terms of the underlying contracts. As of September 30, 2019 and December 31, 2018 , there was $1,093 and $1,436 , respectively, remaining in the other comprehensive income to be accreted. Certain financial instruments, including derivatives, may be eligible for offset in the Consolidated Balance Sheets when the “right of setoff” 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. The Company has not elected to offset such financial instruments in the Consolidated Balance Sheets. 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 September 30, 2019 and December 31, 2018 , the Company had minimum collateral posting thresholds with certain derivative counterparties and had collateral posted of $34,172 and $13,904 , respectively, against its obligations under these agreements. Cash collateral related to derivative contracts is recorded in other assets in the Consolidated Balance Sheets. The following table provides details on the Company’s derivative financial instruments as of the dates presented: September 30, 2019 Notional Amount Asset Liability Not designated as hedging: Interest rate contracts $ 427,468 $ 19,050 $ 19,050 Forward commitments 824,724 582 — Interest rate-lock commitments 679,524 9,142 — Futures contracts 270,000 398 — Option contracts — — — Total $ 2,201,716 $ 29,172 $ 19,050 December 31, 2018 Notional Amount Asset Liability Not designated as hedging: Interest rate contracts $ 295,333 $ 6,679 $ 6,679 Forward commitments 474,208 — 4,958 Interest rate-lock commitments 318,706 6,241 — Futures contracts 166,000 649 — Options contracts 3,800 26 — Total $ 1,258,047 $ 13,595 $ 11,637 September 30, 2019 Notional Amount Asset Liability Designated as hedging: Interest rate swaps $ 30,000 $ — $ 837 December 31, 2018 Notional Amount Asset Liability Designated as hedging: Interest rate swaps $ 30,000 $ 721 $ — Gains (losses) included in the Consolidated Statements of Income related to the Company’s derivative financial instruments were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Not designated as hedging instruments (included in mortgage banking income): Interest rate lock commitments $ 447 $ (3,415 ) $ 4,202 $ (688 ) Forward commitments (3,227 ) 1,524 (12,895 ) 7,477 Futures contracts 4,685 (563 ) 10,663 (4,379 ) Option contracts 3 (55 ) 47 (50 ) Total $ 1,908 $ (2,509 ) $ 2,017 $ 2,360 Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Designated as hedging: Amount of gain reclassified from other comprehensive $ 130 $ 69 $ 343 $ 62 Gain included in interest expense on borrowings 19 20 113 64 Total $ 149 $ 89 $ 456 $ 126 The following discloses the amount included in other comprehensive income (loss), net of tax, for derivative instruments designated as cash flow hedges for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Designated as hedging: Amount of (loss) gain recognized in other comprehensive income, net of tax $ (256 ) $ 169 $ (1,151 ) $ 1,638

Fair value of financial instrum

Fair value of financial instruments	9 Months Ended
	Sep. 30, 2019
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. Impaired loans-Loans considered impaired under FASB ASC 310, "Receivables", are loans for which, based on current information and events, it is probable that the creditor will be unable to collect all amounts due according to the contractual terms of the loan agreement. Fair value adjustments for impaired loans are recorded on a non-recurring basis as either partial write downs based on observable market prices or current appraisal of the collateral. Impaired 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 September 30, 2019 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 242,997 $ 242,997 $ — $ — $ 242,997 Investment securities 671,781 — 671,781 — 671,781 Loans, net 4,313,880 — — 4,299,499 4,299,499 Loans held for sale 305,493 — 305,493 — 305,493 Interest receivable 17,729 — 3,263 14,466 17,729 Mortgage servicing rights 66,156 — — 66,156 66,156 Derivatives 29,172 — 29,172 — 29,172 Financial liabilities: Deposits: Without stated maturities $ 3,725,500 $ 3,725,500 $ — $ — $ 3,725,500 With stated maturities 1,196,263 — 1,208,205 — 1,208,205 Securities sold under agreement to 26,199 26,199 — — 26,199 Federal Home Loan Bank advances 250,000 — 251,799 — 251,799 Subordinated debt 30,930 — 29,760 — 29,760 Interest payable 6,102 356 5,746 — 6,102 Derivatives 19,887 — 19,887 — 19,887 Fair Value December 31, 2018 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 125,356 $ 125,356 $ — $ — $ 125,356 Investment securities 658,805 — 658,805 — 658,805 Loans, net 3,638,579 — — 3,630,500 3,630,500 Loans held for sale 278,815 — 278,815 — 278,815 Interest receivable 14,503 — 2,848 11,655 14,503 Mortgage servicing rights 88,829 — — 88,829 88,829 Derivatives 14,316 — 14,316 — 14,316 Financial liabilities: Deposits: Without stated maturities $ 3,051,972 $ 3,051,972 $ — $ — $ 3,051,972 With stated maturities 1,119,745 — 1,122,076 — 1,122,076 Securities sold under agreement to 15,081 15,081 — — 15,081 Federal Home Loan Bank advances 181,765 — 181,864 — 181,864 Subordinated debt 30,930 — 30,000 — 30,000 Interest payable 5,015 530 4,485 — 5,015 Derivatives 11,637 — 11,637 — 11,637 The balances and levels of the assets measured at fair value on a recurring basis at September 30, 2019 are presented in the following table: September 30, 2019 Quoted prices in active markets for identical assets (liabilities) (level 1) Significant other observable inputs (level 2) Significant unobservable inputs (level 3) Total Recurring valuations: Financial assets: Available-for-sale securities: U.S. government agency securities $ — $ 999 $ — $ 999 Mortgage-backed securities — 485,300 — 485,300 Municipals, tax-exempt — 173,785 — 173,785 Treasury securities — 7,432 — 7,432 Corporate securities — 1,015 — 1,015 Equity securities — 3,250 — 3,250 Total $ — $ 671,781 $ — $ 671,781 Loans held for sale $ — $ 305,493 $ — $ 305,493 Mortgage servicing rights — — 66,156 66,156 Derivatives — 29,172 — 29,172 Financial Liabilities: Derivatives — 19,887 — 19,887 The balances and levels of the assets measured at fair value on a non-recurring basis at September 30, 2019 are presented in the following table: At September 30, 2019 Quoted prices in active markets for identical assets (liabilities) (level 1) Significant other observable inputs (level 2) Significant unobservable inputs (level 3) Total Non-recurring valuations: Financial assets: Other real estate owned $ — $ — $ 6,053 $ 6,053 Impaired loans (1) : Commercial and industrial $ — $ — $ 3,479 $ 3,479 Residential real estate: 1-4 family mortgage — — 315 315 Commercial real estate: Owner occupied — — 260 260 Consumer and other — — 395 395 Total $ — $ — $ 5,815 $ 5,815 (1) Includes both impaired non-purchased loans and collateral-dependent PCI loans. The balances and levels of the assets measured at fair value on a recurring basis at December 31, 2018 are presented in the following table: At December 31, 2018 Quoted prices in active markets for identical assets (liabilities) (level 1) Significant other observable inputs (level 2) Significant unobservable inputs (level 3) Total Recurring valuations: Financial assets: Available-for-sale securities: U.S. government agency securities $ — $ 989 $ — $ 989 Mortgage-backed securities — 508,580 — 508,580 Municipals, tax-exempt — 138,887 — 138,887 Treasury securities — 7,242 — 7,242 Equity securities — 3,107 — 3,107 Total $ — $ 658,805 $ — $ 658,805 Loans held for sale $ — $ 278,815 $ — $ 278,815 Mortgage servicing rights — — 88,829 88,829 Derivatives — 14,316 — 14,316 Financial Liabilities: Derivatives — 11,637 — 11,637 The balances and levels of the assets measured at fair value on a non-recurring basis at December 31, 2018 are presented in the following table: At December 31, 2018 Quoted prices in active markets for identical assets (liabilities) (level 1) Significant other observable inputs (level 2) Significant unobservable inputs (level 3) Total Non-recurring valuations: Financial assets: Other real estate owned $ — $ — $ 2,266 $ 2,266 Impaired Loans (1) : Commercial and industrial $ — $ — $ 732 $ 732 Construction — — 832 832 Residential real estate: 1-4 family mortgage — — 146 146 Commercial real estate: Owner occupied — — 87 87 Non-owner occupied — — 6,921 6,921 Total $ — $ — $ 8,718 $ 8,718 (1) Includes both impaired non-purchased loans and collateral-dependent PCI loans. There were no transfers between Level 1, 2 or 3 during the periods presented. The following table provides a reconciliation for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs, or Level 3 inputs, during the nine months ended September 30, 2019 and 2018 . There was no activity during the three months ended September 30, 2019 and 2018 . Available-for-sale securities Nine Months Ended September 30, 2019 2018 Balance at beginning of period $ — $ 3,604 Reclassification of equity securities without a readily determinable fair value to other assets — (3,604 ) Balance at end of period $ — $ — The following table presents information as of September 30, 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 Unobservable inputs Range of inputs Impaired loans (1) $ 5,815 Valuation of collateral Discount for comparable sales 0%-30% Other real estate owned $ 6,053 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. The following table presents information as of December 31, 2018 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 Unobservable inputs Range of inputs Impaired loans (1) $ 8,718 Valuation of collateral Discount for comparable sales 0%-30% Other real estate owned $ 2,266 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. Loans considered impaired are reserved for at the time the loan is identified as impaired taking into account the fair value of the collateral less estimated selling costs. Impaired 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 loan losses. Appraisals for both collateral-dependent impaired 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 elected to measure all 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 better matches the changes in fair value of the loans with changes in the fair value of derivative instruments used to economically hedge them. Net losses of $ 3,291 and $ 2,329 resulting from fair value changes of mortgage loans held for sale were recorded in income during the three and nine months months ended September 30, 2019 , respectively, compared to net gains of $ 3,212 and $ 7,409 during the three and nine months ended September 30, 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 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. There were $ 28,897 and $ 67,362 of delinquent GNMA loans that had previously been sold at September 30, 2019 and December 31, 2018, respectively. 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. As such, the Company did not record any rebooked GNMA loans on the balance sheet as of September 30, 2019 or December 31, 2018. 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 measured at fair value as of September 30, 2019 and December 31, 2018 : September 30, 2019 Aggregate fair value Aggregate Unpaid Principal Balance Difference Mortgage loans held for sale measured at fair value $ 305,493 $ 297,311 $ 8,182 Past due loans of 90 days or more — — — Nonaccrual loans — — — December 31, 2018 Mortgage loans held for sale measured at fair value $ 278,418 $ 267,907 $ 10,511 Past due loans of 90 days or more — — — Nonaccrual loans 397 397 —

Segment reporting

Segment reporting	9 Months Ended
	Sep. 30, 2019
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 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 $ 112 and $ 1,995 in restructuring and miscellaneous charges during the three and nine months ended September 30, 2019 related to these sales. The following tables provide segment financial information for the three and nine months ended September 30, 2019 and 2018 as follows: Three Months Ended September 30, 2019 Banking Mortgage Consolidated Net interest income $ 58,350 $ (45 ) $ 58,305 Provision for loan loss 1,831 — 1,831 Mortgage banking income 10,693 23,591 34,284 Change in fair value of mortgage servicing rights, net of hedging (1) — (5,091 ) (5,091 ) Other noninterest income 8,952 — 8,952 Depreciation and amortization 1,255 125 1,380 Amortization of intangibles 1,197 — 1,197 Other noninterest mortgage banking expense 8,087 15,561 23,648 Other noninterest expense (2) 36,598 112 36,710 Income before income taxes $ 29,027 $ 2,657 $ 31,684 Income tax expense 7,718 Net income $ 23,966 Total assets $ 5,730,492 $ 358,403 $ 6,088,895 Goodwill 168,486 — 168,486 (1) Included in mortgage banking income. (2) Included $ 295 in merger costs in the Banking segment related to the Atlantic Capital branch acquisition and the pending Farmers National merger and $ 112 in the Mortgage segment related to mortgage business restructuring charges. Three Months Ended September 30, 2018 Banking Mortgage Consolidated Net interest income $ 52,733 $ 22 $ 52,755 Provision for loan loss 1,818 — 1,818 Mortgage banking income 7,417 21,933 29,350 Change in fair value of mortgage servicing rights, net of hedging (1) — (2,701 ) (2,701 ) Other noninterest income 7,706 — 7,706 Depreciation and amortization 896 117 1,013 Amortization of intangibles 777 — 777 Other noninterest mortgage banking expense 6,383 18,704 25,087 Other noninterest expense 30,336 — 30,336 Income before income taxes $ 27,646 $ 433 $ 28,079 Income tax expense 6,702 Net income $ 21,377 Total assets $ 4,637,097 $ 421,070 $ 5,058,167 Goodwill 137,090 100 137,190 (1) Included in mortgage banking income. Nine Months Ended September 30, 2019 Banking Mortgage Consolidated Net interest income $ 168,322 $ 22 $ 168,344 Provision for loan loss 4,103 — 4,103 Mortgage banking income 20,530 64,982 85,512 Change in fair value of mortgage servicing rights, net of hedging (1) — (10,772 ) (10,772 ) Other noninterest income 25,423 — 25,423 Depreciation and amortization 3,431 399 3,830 Amortization of intangibles 3,180 — 3,180 Other noninterest mortgage banking expense 15,090 50,608 65,698 Other noninterest expense (2) 107,452 1,995 109,447 Income before income taxes $ 81,019 $ 1,230 $ 82,249 Income tax expense 20,007 Net income 62,242 Total assets $ 5,730,492 $ 358,403 $ 6,088,895 Goodwill (3) 168,486 — 168,486 (1) Included in mortgage banking income. (2) Included $ 4,699 in merger costs in the Banking segment related to the Atlantic Capital branch acquisition and the pending Farmers National merger and $ 1,995 in the Mortgage segment related to mortgage business restructuring charges. (3) Recognized $100 of impairment of goodwill related to the sale of the third party origination channel in the Mortgage segment. See Note 6. Goodwill and intangible assets. Nine Months Ended September 30, 2018 Banking Mortgage Consolidated Net interest income $ 153,173 $ (472 ) $ 152,701 Provision for loan loss 3,198 — 3,198 Mortgage banking income 20,419 67,437 87,856 Change in fair value of mortgage servicing rights, net of hedging (1) — (6,192 ) (6,192 ) Other noninterest income 21,729 — 21,729 Depreciation and amortization 2,864 387 3,251 Amortization of intangibles 2,432 — 2,432 Other noninterest mortgage banking expense 17,129 56,926 74,055 Other noninterest expense (2) 89,984 — 89,984 Income before income taxes $ 79,714 $ 3,460 $ 83,174 Income tax expense 19,978 Net income 63,196 Total assets $ 4,637,097 $ 421,070 $ 5,058,167 Goodwill 137,090 100 137,190 (1) Included in mortgage banking income. (2) Included $1,193 in merger costs related to the acquisition of the Clayton Banks and $671 in offering costs in the Banking segment related to the follow-on secondary offering. 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 5.00% and 5.25% as of September 30, 2019 and 2018 , respectively, and further 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 $ 2,875 and $8,723 for the three and nine months ended September 30, 2019 , respectively, and $3,997 and $13,022 for the three and nine months ended September 30, 2018 , respectively.

Minimum capital requirements

Minimum capital requirements	9 Months Ended
	Sep. 30, 2019
Banking and Thrift [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 amounts and ratios of common equity Tier I capital to risk-weighted assets. Additionally, under Basel III rules, the decision was made to opt-out of including accumulated other comprehensive income in regulatory capital. As of September 30, 2019 and December 31, 2018 , the Bank and Company met all capital adequacy requirements to which they are subject. Beginning in 2016, an additional conservation buffer was added to the minimum requirements for capital adequacy purposes, subject to a three year phase-in period. As of September 30, 2019 and December 31, 2018 , the buffer was 2.50% and 1.88% , respectively. The capital conservation buffer was fully phased in on January 1, 2019. Actual and required capital amounts and ratios are presented below at period-end. Actual For capital adequacy purposes Minimum Capital adequacy with capital buffer To be well capitalized under prompt corrective action provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio September 30, 2019 Total Capital (to risk-weighted assets) FB Financial Corporation $ 614,708 12.0 % $ 409,805 8.0 % $ 537,870 10.5 % N/A N/A FirstBank 601,769 11.7 % 411,466 8.0 % 540,049 10.5 % $ 514,332 10.0 % Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 583,244 11.3 % $ 309,687 6.0 % $ 438,723 8.5 % N/A N/A FirstBank 570,305 11.1 % 308,273 6.0 % 436,720 8.5 % $ 411,031 8.0 % Tier 1 Capital (to average assets) FB Financial Corporation $ 583,244 10.1 % $ 230,988 4.0 % N/A N/A N/A N/A FirstBank 570,305 9.8 % 232,778 4.0 % N/A N/A $ 290,972 5.0 % Common Equity Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 553,244 10.8 % $ 230,518 4.5 % $ 358,584 7.0 % N/A N/A FirstBank 570,305 11.1 % 231,205 4.5 % 359,652 7.0 % $ 333,962 6.5 % Actual For capital adequacy purposes Minimum Capital adequacy with capital buffer To be well capitalized under prompt corrective action provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio December 31, 2018 Total Capital (to risk-weighted assets) FB Financial Corporation $ 582,945 13.0 % $ 358,735 8.0 % $ 442,814 9.9 % N/A N/A FirstBank 561,327 12.5 % 359,249 8.0 % 443,448 9.9 % $ 449,062 10.0 % Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 554,013 12.4 % $ 268,071 6.0 % $ 351,843 7.9 % N/A N/A FirstBank 532,395 11.9 % 268,434 6.0 % 352,320 7.9 % $ 357,913 8.0 % Tier 1 Capital (to average assets) FB Financial Corporation $ 554,013 11.4 % $ 194,391 4.0 % N/A N/A N/A N/A FirstBank 532,395 10.9 % 195,374 4.0 % N/A N/A $ 244,218 5.0 % Common Equity Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 524,013 11.7 % $ 201,543 4.5 % $ 285,520 6.4 % N/A N/A FirstBank 532,395 11.9 % 201,326 4.5 % 285,212 6.4 % $ 290,804 6.5 %

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation 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 vested and unvested restricted stock units, excluding cash-settled EBI units discussed above, outstanding at September 30, 2019 and 2018 : Nine Months Ended September 30, 2019 2018 Restricted Stock Units Outstanding Weighted Average Grant Date Fair Value Restricted Stock Units Outstanding Weighted Average Grant Date Fair Value Balance at beginning of period 1,140,215 $ 21.96 1,214,325 $ 19.97 Grants 167,343 34.05 117,459 40.20 Released and distributed (vested) (270,959 ) 24.00 (205,565 ) 21.93 Forfeited/expired (11,727 ) 24.56 (10,035 ) 23.66 Balance at end of period 1,024,872 $ 23.67 1,116,184 $ 21.86 The total fair value of restricted stock units vested and released, excluding cash-settled EBI units, was $ 1,488 and $6,503 for the three and nine months ended September 30, 2019 , respectively, and $ 490 and $4,508 for the three and nine months ended September 30, 2018 , respectively. The compensation cost related to stock grants and vesting of restricted stock units, excluding cash-settled EBI units, was $ 1,836 and $5,621 for the three and nine months ended September 30, 2019 , respectively, and $ 1,508 and $5,327 for the three and nine months ended September 30, 2018 , respectively. This included $ 186 and $537 paid to Company independent directors during the three and nine months ended September 30, 2019 , respectively, and $ 212 and $557 for the three and nine months ended September 30, 2018 , respectively, related to independent director grants and compensation elected to be settled in stock. The nine months ended September 30, 2019 also includes a one-time expense of $249 related to the modification of vesting terms of certain grants. As of September 30, 2019 and 2018 , there were $12,759 and $12,768 , respectively, of total unrecognized compensation cost related to nonvested stock-settled EBI Units and restricted stock units (excluding cash-settled EBI units discussed above) which is expected to be recognized over a weighted-average period of 1.87 years and 2.33 years, respectively. At September 30, 2019 and December 31, 2018, there were $ 394 and $ 226 , respectively, accrued in other liabilities related to dividends declared to be paid upon vesting and distribution of the underlying RSUs. Employee Stock Purchase Plan: In 2016, the Company adopted 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 $25,000 worth of common stock in any calendar year). During the three months ended September 30, 2019 and 2018 , there were 12,558 and 12,072 shares of of common stock issues under the ESPP, respectively. During the nine months ended September 30, 2019 and 2018 , there were 23,171 shares and 28,609 shares of common stock issued under the ESPP, respectively. As of September 30, 2019 and 2018 , there were 2,409,185 and 2,432,356 shares available for issuance under the ESPP, respectively.

Related party transactions

Related party transactions	9 Months Ended
	Sep. 30, 2019
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, 2019 $ 32,264 New loans and advances 12,160 Change in related party status (9,687 ) Repayments (3,458 ) Loans outstanding at September 30, 2019 $ 31,279 Unfunded commitments to certain executive officers, certain management and directors and their associates totaled $26,114 and $15,000 at September 30, 2019 and December 31, 2018 , respectively. (B) Deposits: The Bank held deposits from related parties totaling $271,090 and $287,156 as of September 30, 2019 and December 31, 2018 , respectively. (C) Leases: The Bank leases various office spaces from entities owned by certain directors of the Company under varying terms. The Company had $92 and $116 in unamortized leasehold improvements related to these leases at September 30, 2019 and December 31, 2018 , respectively. These improvements are being amortized over a term not to exceed the length of the lease. Lease expense for these properties totaled $128 and $381 for the three and nine months ended September 30, 2019 respectively, and $128 and $387 for the three and nine months ended September 30, 2018 , respectively. (D) Aviation time sharing agreement: The Company is a participant to an aviation time sharing agreement with an entity owned by a certain director of the Company. During the three and nine months ended September 30, 2019 , the Company made payments of $46 and $143 , respectively, and $36 and $127 during the three and nine months ended September 30, 2018 , respectively, under these agreements. (E) Registration rights agreement: The Company is party to a registration rights agreement with its former majority shareholder entered into in connection with the 2016 IPO, under which the Company is responsible for payment of expenses (other than underwriting discounts and commissions) relating to sales to the public by the shareholder of shares of the Company’s common stock beneficially owned by him. Such expenses include registration fees, legal and accounting fees, and printing costs payable by the Company and expensed when incurred. During the nine months ended September 30, 2018 , the Company paid $0.7 million under this agreement. No such expenses were incurred for the three and nine months ended September 30, 2019 .

Basis of presentation (Policies

Basis of presentation (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Earnings per common share	Earnings per 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 period, 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.
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 September 30, 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.
Recently adopted accounting standards and Newly issued not yet effective accounting standards	Recently adopted accounting standards: Except as set forth below, the Company did not adopt any new accounting standards that were not disclosed in the Company's 2018 audited consolidated financial statements included on Form 10-K. In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” The update requires lessees to recognize right-of-use assets and lease liabilities for all leases not considered short term leases. The provisions of the update also include (a) defining direct costs to only include those incremental costs that would not have been incurred if the lease had not been entered into, (b) circumstances under which the transfer contract in a sale-leaseback transaction should be accounted for as the sale of an asset by the seller-lessee and the purchase of an asset by the buyer-lessor, and (c) additional disclosure requirements. The provisions of this update became effective for the Company on January 1, 2019. In July 2018, the FASB issued ASU 2018-10, “Codification Improvements to Topic 842, Leases” and 2018-11, “Leases (Topic 842): Targeted Improvements”. ASU No. 2018-10 provides improvements related to ASU No. 2016-02 to provide corrections or improvements to a number of areas within FASB Accounting Standards Codification ("ASC") Topic 842 and provides additional and optional transition method to adopt the new lease standard. ASU No. 2018-11 allows entities to initially apply the new lease standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. ASU 2018-11 also allows lessors to not separate non-lease components from the associated lease component if certain conditions are met. The amendments in these updates became effective for the Company on January 1, 2019. FB Financial Corporation elected the optional transition method permitted by ASU 2018-11. Under this method, an entity shall recognize and measure leases that exist at the application date and prior comparative periods are not adjusted. Additionally, the Company elected to adopt the practical expedients allowed under the updates and therefore did not reassess 1) whether any expired or existing contract contain leases, 2) the lease classification for any expired or existing leases, or 3) initial direct costs for any existing leases. On January 1, 2019, the Company adopted these updates and recognized a right of use asset ("ROU") and lease liability of $32,545 and $34,876 , respectively, and recorded a cumulative effect adjustment to retained earnings of $1,309 , net of deferred taxes of $461 , in addition to adjustments to leasehold improvements of $1,022 and a reclassification from a previously-recognized lease intangible asset for $460 . The difference between the asset and liability amounts represents lease incentive liabilities, deferred rent and a lease intangible asset that was reclassified to the ROU asset upon adoption. This adoption did not have a significant impact on the Company's consolidated statements of income and did not have an impact on the Company's cash flows. Disclosures required by the update are presented in Note 7, "Leases" in the notes to the consolidated financial statements. In March 2017, the FASB issued ASU 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities." The amendments in this ASU shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount, which continue to be amortized to maturity. Public business entities were required to prospectively apply the amendments in this ASU to annual periods beginning after December 15, 2018, including interim periods. The adoption of this update did not have an impact on the Company's consolidated financial statements. I n July 2019, the FASB issued ASU No. 2019-07, “Codification Updates to SEC Sections-Amendments to SEC Paragraphs Pursuant to SEC Final Rule Release No. 33-10532, Disclosure Update and Simplification, and Nos. 33-10231 and 33-10442, Investment Company Reporting Modernization, and Miscellaneous Updates.” These amendments modify FASB Codification to reflect previously issued SEC rules for disclosure updates and simplification and investment company reporting modernization. The SEC adopted these rules to improve its regulations on financial reporting and disclosure. Other miscellaneous updates were made to agree to the electronic Code of Federal Regulations. The amendments in this update became effective upon issuance on July 26, 2019. There were no material impacts on the consolidated financial statements. Newly issued not yet effective accounting standards: In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts and 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 model will require 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 loans obtained as a result of any acquisition not deemed to be purchased credit deteriorated ("PCD"). The new current expected credit loss standard ("CECL") also requires the allowance for credit losses for PCD loans 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. The disclosure of credit quality indicators related to the amortized cost of financing receivables will be further disaggregated by year of origination (or vintage). Institutions are to apply the changes through a cumulative-effect adjustment to their retained earnings as of the beginning of the first reporting period in which the standard is effective. ASU 2016-13 will become effective for interim and annual periods beginning after December 15, 2019. Management established a CECL implementation working group, which includes the appropriate members of management to evaluate the impact the adoption of this ASU will have on the Company's financial statements and disclosures and determine the most appropriate method of implementing the amendments in this ASU. The working group selected a software vendor and has worked to validate the accuracy and completeness of data being used as inputs into the model based on the methodology selected for the Company's identified loan segments. During the remainder of 2019, the Company will refine modeling segments and assumptions in addition to finalizing and documenting internal controls and accounting and credit policy elections, drafting disclosures, and completing model validation. Parallel processing of the existing allowance for loan losses model with the CECL model will occur during the fourth quarter of 2019. The Company is currently evaluating the impact of this adoption on its financial statements and disclosures and currently expects to record a one-time adjustment to retained earnings to increase the allowance for loan losses, however the magnitude of this adjustment cannot currently be reasonably quantified. The total increase in the allowance for loan losses will be partly offset by the existing credit discount on purchased credit impaired loans upon adoption. Management plans to disclose the total impact in Form 10-K for the year ended December 31, 2019. In December 2018, the Office of the Comptroller of the Currency ("OCC"), the Board of Governors of the Federal Reserve System, and the Federal Deposit Insurance Corporation ("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. The Company plans to adopt the transitional guidance to reduce the impact of the initial adoption to our capital. In April 2019, the FASB issued ASU No. 2019-04, "Financial Instruments—Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Financial Instruments (Topic 825): Codification Improvements" 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 will become 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 rate under the hypothetical method and will become 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 will become effective for fiscal years and interim periods beginning after December 15, 2019. The Company is currently evaluating the impact of adopting the new guidance on the consolidated financial statements, but it is not expected to have a material impact. In May 2019, the FASB issued ASU No. 2019-05, "Financial Instruments—Credit Losses (Topic 326): Targeted Transition Relief." These amendments provide targeted transition relief allowing entities to irrevocably elect the fair value option, on an instrument-by-instrument basis, for certain financial assets (excluding held-to-maturity debt securities) previously measured at amortized cost. The amendments in this update become effective for annual periods and interim periods within those annual periods beginning after December 15, 2019. This update will not have an impact on the Company's consolidated financial statements or disclosures. 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 will 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 recognizing 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. An entity will still 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 will become effective for interim and annual periods beginning after December 15, 2019. Early adoption is permitted, including in an interim period, for impairment tests performed after January 1, 2017. Management does not expect adoption of this standard to have any impact on the Company's consolidated financial statements or disclosures. 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. Early adoption is permitted. The Company does not expect adoption of this standard to have a significant impact on the 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 new disclosure guidance is effective for fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is currently evaluating the impact this change will have on its consolidated financial statements and disclosures. In March 2019, FASB issued ASU 2019-01, "Leases (Topic 842): Codification Improvements", which align 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 amendments in this update become effective for fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company is currently evaluating the impact of this change on its consolidated financial statements and disclosures, but it is not expected to have a material impact.

Basis of presentation (Tables)

Basis of presentation (Tables)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Summary of Basic and Diluted Earnings Per Common Share	The following is a summary of the basic and diluted earnings per common share calculation for each of the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Basic earnings per common share calculation: Net income $ 23,966 $ 21,377 $ 62,242 $ 63,196 Dividends paid on and undistributed earnings allocated to (128 ) (114 ) (333 ) (337 ) Earnings attributable to common shareholders $ 23,838 $ 21,263 $ 61,909 $ 62,859 Weighted-average basic shares outstanding 30,899,583 30,692,668 30,849,035 30,661,852 Basic earnings per common share $ 0.77 $ 0.69 $ 2.01 $ 2.05 Diluted earnings per common share: Earnings attributable to common shareholders 23,838 21,263 61,909 62,859 Weighted-average basic shares outstanding 30,899,583 30,692,668 30,849,035 30,661,852 Weighted-average diluted shares contingently issuable 525,990 646,960 529,751 636,802 Weighted-average diluted shares outstanding 31,425,573 31,339,628 31,378,786 31,298,654 Diluted earnings per common share $ 0.76 $ 0.68 $ 1.97 $ 2.01

Mergers and acquisitions (Table

Mergers and acquisitions (Tables)	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The Company incurred $199 and $4,614 in merger expenses during the three and nine months ended September 30, 2019 , respectively, in connection with this transaction. These expenses are primarily comprised of professional services and employee-related costs in addition to branch closings and conversion and integration costs. The following tables present the preliminary fair values o
Schedule of Consideration Paid and Allocation of Purchase Price to Net Assets Acquired	Consideration: Deposit premium $ 36,790 Preliminary allocation of consideration: Fair value of net assets acquired $ 5,394 Goodwill (preliminary) 31,396 Total consideration $ 36,790
Schedule of Loans and Debt Securities Acquired with Deteriorated Credit Quality	The following table presents the fair value of acquired purchased credit impaired loans accounted for in accordance with ASC 310-30 "Loans and Debt Securities Acquired with Deteriorated Credit Quality" from the Atlantic Capital branch acquisition as of the acquisition date: April 5, 2019 Contractually-required principal and interest $ 11,374 Nonaccretable difference 1,615 Best estimate of contractual cash flows expected to be collected 9,759 Accretable yield 1,167 Fair value $ 8,592
Business Acquisition, Pro Forma Information	The pro forma information is not indicative of what would have occurred had the acquisition taken place on January 1, 2018 and does not include the effect of all cost-saving or revenue-enhancing strategies. Three months ended September 30, Nine months ended September 30, 2019 2018 2019 2018 Net interest income $ 58,305 $ 56,522 $ 171,915 $ 165,209 Total revenues $ 96,450 $ 91,688 $ 272,868 $ 271,099 Net income $ 23,966 $ 20,283 $ 59,745 $ 60,680

Investment securities (Tables)

Investment securities (Tables)	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Cost of Securities and Fair Values	The amortized cost of securities and their fair values at September 30, 2019 and December 31, 2018 are shown below: September 30, 2019 Amortized cost Gross unrealized gains Gross unrealized losses Fair Value Investment Securities Available-for-sale debt securities U.S. government agency securities $ 1,000 $ — $ (1 ) $ 999 Mortgage-backed securities - residential 481,580 5,784 (2,064 ) 485,300 Municipals, tax exempt 165,100 8,754 (69 ) 173,785 Treasury securities 7,415 17 — 7,432 Corporate securities 1,000 15 — 1,015 Total $ 656,095 $ 14,570 $ (2,134 ) $ 668,531 December 31, 2018 Amortized cost Gross unrealized gains Gross unrealized losses Fair Value Investment Securities Available-for-sale debt securities U.S. government agency securities $ 1,000 $ — $ (11 ) $ 989 Mortgage-backed securities - residential 520,654 1,191 (13,265 ) 508,580 Municipals, tax exempt 138,994 1,565 (1,672 ) 138,887 Treasury securities 7,385 — (143 ) 7,242 Total $ 668,033 $ 2,756 $ (15,091 ) $ 655,698
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. September 30, 2019 December 31, 2018 Available-for-sale Available-for-sale Amortized cost Fair value Amortized cost Fair value Due in one year or less $ 5,292 $ 5,312 $ 15,883 $ 16,028 Due in one to five years 12,477 12,601 13,806 13,740 Due in five to ten years 15,412 15,978 18,539 18,387 Due in over ten years 141,334 149,340 99,151 98,963 174,515 183,231 147,379 147,118 Mortgage-backed securities - residential 481,580 485,300 520,654 508,580 Total debt securities $ 656,095 $ 668,531 $ 668,033 $ 655,698
Summary of Summary of Sales and Other Dispositions of Available-for-Sale Securities	Sales and other dispositions of available-for-sale securities were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Proceeds from sales $ 22,740 $ — $ 24,498 $ 221 Proceeds from maturities, prepayments and calls 28,694 20,068 78,861 54,576 Gross realized gains 1 — 7 1 Gross realized losses 76 — 83 9
Schedule of Gross Unrealized Losses	The following tables show gross unrealized losses at September 30, 2019 and December 31, 2018 , aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position: September 30, 2019 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 $ — $ — $ 999 $ (1 ) $ 999 $ (1 ) Mortgage-backed securities - residential 26,610 (70 ) 217,385 (1,994 ) 243,995 (2,064 ) Municipals, tax exempt 10,553 (69 ) — — 10,553 (69 ) Treasury securities — — — — — — Total $ 37,163 $ (139 ) $ 218,384 $ (1,995 ) $ 255,547 $ (2,134 ) December 31, 2018 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 $ — $ — $ 989 $ (11 ) $ 989 $ (11 ) Mortgage-backed securities - residential 60,347 (478 ) 335,769 (12,787 ) 396,116 (13,265 ) Municipals, tax exempt 27,511 (366 ) 25,343 (1,306 ) 52,854 (1,672 ) Treasury securities — — 7,242 (143 ) 7,242 (143 ) Total $ 87,858 $ (844 ) $ 369,343 $ (14,247 ) $ 457,201 $ (15,091 )

Loans and allowance for loan _2

Loans and allowance for loan losses (Tables)	9 Months Ended
	Sep. 30, 2019
Receivables [Abstract]
Loans Outstanding by Major Lending Classification	Loans outstanding at September 30, 2019 and December 31, 2018 , by major lending classification are as follows: September 30, December 31, 2019 2018 Commercial and industrial $ 997,921 $ 867,083 Construction 537,784 556,051 Residential real estate: 1-to-4 family mortgage 710,077 555,815 Residential line of credit 215,493 190,480 Multi-family mortgage 80,352 75,457 Commercial real estate: Owner occupied 620,635 493,524 Non-owner occupied 914,502 700,248 Consumer and other 268,580 228,853 Gross loans 4,345,344 3,667,511 Less: Allowance for loan losses (31,464 ) (28,932 ) Net loans $ 4,313,880 $ 3,638,579
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. Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Balance at the beginning of period $ (14,862 ) $ (20,169 ) $ (16,587 ) $ (17,682 ) Additions through the branch acquisition of Atlantic Capital Bank — — (1,167 ) — Principal reductions and other reclassifications from nonaccretable difference (150 ) (84 ) 100 (3,536 ) Accretion 1,583 2,103 5,471 6,943 Changes in expected cash flows 110 6 (1,136 ) (3,869 ) Balance at end of period $ (13,319 ) $ (18,144 ) $ (13,319 ) $ (18,144 )
Allowance for Loan Losses by Portfolio Segment and Related Investment in Loans Net of Unearned Interest	The following provides the changes in the allowance for loan losses by portfolio segment for the three and nine months ended September 30, 2019 and 2018 : 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 Three Months Ended September 30, 2019 Beginning balance - $ 4,923 $ 9,655 $ 3,288 $ 755 $ 617 $ 3,512 $ 4,478 $ 2,910 $ 30,138 Provision for loan losses 234 186 18 67 (43 ) 194 461 714 1,831 Recoveries of loans 16 1 25 75 — 3 — 92 212 Loans charged off (3 ) — — (170 ) — — (12 ) (532 ) (717 ) Ending balance - $ 5,170 $ 9,842 $ 3,331 $ 727 $ 574 $ 3,709 $ 4,927 $ 3,184 $ 31,464 Nine Months Ended September 30, 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 17 105 (77 ) 100 8 482 790 2,678 4,103 Recoveries of loans previously charged-off 66 8 62 121 — 95 — 435 787 Loans charged off (261 ) — (82 ) (305 ) — — (12 ) (1,698 ) (2,358 ) Ending balance - September 30, 2019 $ 5,170 $ 9,842 $ 3,331 $ 727 $ 574 $ 3,709 $ 4,927 $ 3,184 $ 31,464 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 Three Months Ended September 30, 2018 Beginning balance - $ 4,747 $ 9,023 $ 3,378 $ 795 $ 391 $ 3,290 $ 3,272 $ 1,451 $ 26,347 Provision for loan losses 847 (754 ) 47 25 292 236 639 486 1,818 Recoveries of loans 104 13 99 31 — 10 — 103 360 Loans charged off (333 ) (14 ) (4 ) (13 ) — (55 ) — (498 ) (917 ) Ending balance - $ 5,365 $ 8,268 $ 3,520 $ 838 $ 683 $ 3,481 $ 3,911 $ 1,542 $ 27,608 Nine Months Ended September 30, 2018 Beginning balance - December 31, 2017 $ 4,461 $ 7,135 $ 3,197 $ 944 $ 434 $ 3,558 $ 2,817 $ 1,495 $ 24,041 Provision for loan losses 1,088 35 235 (175 ) 249 (163 ) 1,043 886 3,198 Recoveries of loans previously charged-off 374 1,127 157 102 — 141 51 416 2,368 Loans charged off (558 ) (29 ) (69 ) (33 ) — (55 ) — (1,255 ) (1,999 ) Ending balance - $ 5,365 $ 8,268 $ 3,520 $ 838 $ 683 $ 3,481 $ 3,911 $ 1,542 $ 27,608
Allocation of Allowance for Loan Losses by Loan Category Broken Out Between Loans Individually and Collectively Evaluated for Impairment	The following tables provides the allocation of the allowance for loan losses by loan category broken out between loans individually evaluated for impairment, loans collectively evaluated for impairment and loans acquired with deteriorated credit quality as of September 30, 2019 and December 31, 2018 : September 30, 2019 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 Amount of allowance allocated to: Individually evaluated for impairment $ 13 $ — $ 11 $ — $ — $ 52 $ 405 $ 254 $ 735 Collectively evaluated for impairment 5,064 9,796 3,173 727 574 3,641 4,225 1,967 29,167 Acquired with deteriorated credit quality 93 46 147 — — 16 297 963 1,562 Ending balance - September 30, 2019 $ 5,170 $ 9,842 $ 3,331 $ 727 $ 574 $ 3,709 $ 4,927 $ 3,184 $ 31,464 December 31, 2018 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 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
Amount of Loans by Loan Category Broken Between Loans Individually and Collectively Evaluated for Impairment	The following tables provides the amount of loans by loan category broken between loans individually evaluated for impairment, loans collectively evaluated for impairment and loans acquired with deteriorated credit quality as of September 30, 2019 and December 31, 2018 : September 30, 2019 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 Loans, net of unearned income Individually evaluated for impairment $ 3,834 $ 2,061 $ 1,346 $ 245 $ — $ 2,476 $ 7,846 $ 459 $ 18,267 Collectively evaluated for impairment 992,463 532,521 687,748 215,175 80,352 612,112 894,468 249,169 4,264,008 Acquired with deteriorated credit quality 1,624 3,202 20,983 73 — 6,047 12,188 18,952 63,069 Ending balance - September 30, 2019 $ 997,921 $ 537,784 $ 710,077 $ 215,493 $ 80,352 $ 620,635 $ 914,502 $ 268,580 $ 4,345,344 December 31, 2018 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 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 Indicators by Portfolio Class	The following tables show credit quality indicators by portfolio class at September 30, 2019 and December 31, 2018 : September 30, 2019 Pass Watch Substandard Total Loans, excluding purchased credit impaired loans Commercial and industrial $ 930,094 $ 49,209 $ 16,994 $ 996,297 Construction 528,358 4,074 2,150 534,582 Residential real estate: 1-to-4 family mortgage 666,942 8,254 13,898 689,094 Residential line of credit 212,556 1,171 1,693 215,420 Multi-family mortgage 80,285 67 — 80,352 Commercial real estate: Owner occupied 574,582 25,962 14,044 614,588 Non-owner occupied 868,007 25,597 8,710 902,314 Consumer and other 243,495 3,315 2,818 249,628 Total loans, excluding purchased credit impaired loans $ 4,104,319 $ 117,649 $ 60,307 $ 4,282,275 Purchased credit impaired loans Commercial and industrial $ — $ 1,023 $ 601 $ 1,624 Construction — 2,994 208 3,202 Residential real estate: 1-to-4 family mortgage — 16,540 4,443 20,983 Residential line of credit — — 73 73 Multi-family mortgage — — — — Commercial real estate: Owner occupied — 4,244 1,803 6,047 Non-owner occupied — 5,620 6,568 12,188 Consumer and other — 14,074 4,878 18,952 Total purchased credit impaired loans $ — $ 44,495 $ 18,574 $ 63,069 Total loans $ 4,104,319 $ 162,144 $ 78,881 $ 4,345,344 December 31, 2018 Pass Watch Substandard Total Loans, excluding purchased credit impaired loans Commercial and industrial $ 804,447 $ 52,624 $ 8,564 $ 865,635 Construction 543,953 5,012 1,331 550,296 Residential real estate: 1-to-4 family mortgage 519,541 8,697 8,200 536,438 Residential line of credit 186,753 1,039 2,688 190,480 Multi-family mortgage 75,381 76 — 75,457 Commercial real estate: Owner occupied 456,694 16,765 14,049 487,508 Non-owner occupied 667,447 8,881 7,654 683,982 Consumer and other 204,279 2,763 1,674 208,716 Total loans, excluding purchased credit impaired loans $ 3,458,495 $ 95,857 $ 44,160 $ 3,598,512 Purchased credit impaired loans Commercial and industrial $ — $ 964 $ 484 $ 1,448 Construction — 3,229 2,526 5,755 Residential real estate: 1-to-4 family mortgage — 14,681 4,696 19,377 Residential line of credit — — — — Multi-family mortgage — — — — Commercial real estate: Owner occupied — 4,110 1,906 6,016 Non-owner occupied — 8,266 8,000 16,266 Consumer and other — 15,422 4,715 20,137 Total purchased credit impaired loans $ — $ 46,672 $ 22,327 $ 68,999 Total loans $ 3,458,495 $ 142,529 $ 66,487 $ 3,667,511
Past Due Loans	The following tables provide the period-end amounts of loans that are past due thirty to eighty-nine days, past due ninety or more days and still accruing interest, loans not accruing interest and loans current on payments accruing interest by category at September 30, 2019 and December 31, 2018 : September 30, 2019 30-89 days past due 90 days or more and accruing interest Non-accrual loans Purchased Credit Impaired loans Loans current on payments and accruing interest Total Commercial and industrial $ 3,892 $ 4 $ 383 $ 1,624 $ 992,018 $ 997,921 Construction 327 — 1,107 3,202 533,148 537,784 Residential real estate: 1-to-4 family mortgage 5,552 1,316 7,260 20,983 674,966 710,077 Residential line of credit 475 298 421 73 214,226 215,493 Multi-family mortgage — — — — 80,352 80,352 Commercial real estate: Owner occupied 153 — 1,274 6,047 613,161 620,635 Non-owner occupied 2,605 5 6,596 12,188 893,108 914,502 Consumer and other 2,446 829 870 18,952 245,483 268,580 Total $ 15,450 $ 2,452 $ 17,911 $ 63,069 $ 4,246,462 $ 4,345,344 December 31, 2018 30-89 days past due 90 days or more and accruing interest Non-accrual loans Purchased Credit Impaired loans Loans current on payments and accruing interest Total Commercial and industrial $ 999 $ 65 $ 438 $ 1,448 $ 864,133 $ 867,083 Construction 109 — 283 5,755 549,904 556,051 Residential real estate: 1-to-4 family mortgage 4,919 737 2,704 19,377 528,078 555,815 Residential line of credit 726 957 804 — 187,993 190,480 Multi-family mortgage — — — — 75,457 75,457 Commercial real estate: Owner occupied 407 197 2,423 6,016 484,481 493,524 Non-owner occupied 61 77 6,885 16,266 676,959 700,248 Consumer and other 1,987 1,008 148 20,137 205,573 228,853 Total $ 9,208 $ 3,041 $ 13,685 $ 68,999 $ 3,572,578 $ 3,667,511
Impaired Loans Recognized	Average recorded investment and interest income on a cash basis recognized during the three and nine months ended September 30, 2019 and 2018 on impaired loans, segregated by class, were as follows: Three Months Ended Nine Months Ended September 30, 2019 Average recorded investment Interest income recognized (cash basis) Average recorded investment Interest income recognized (cash basis) With a related allowance recorded: Commercial and industrial $ 3,109 $ 51 $ 1,850 $ 156 Construction — — — — Residential real estate: 1-to-4 family mortgage 265 2 205 13 Residential line of credit — — — — Multi-family mortgage — — — — Commercial real estate: Owner occupied 184 4 371 10 Non-owner occupied 6,143 56 6,241 90 Consumer and other 447 — 198 19 Total $ 10,148 $ 113 $ 8,865 $ 288 With no related allowance recorded: Commercial and industrial $ 766 $ 11 $ 991 $ 36 Construction 1,639 90 1,641 142 Residential real estate: 1-to-4 family mortgage 835 24 962 50 Residential line of credit 427 — 245 2 Multi-family mortgage — — — — Commercial real estate: Owner occupied 2,045 41 2,171 103 Non-owner occupied 1,050 — 1,050 — Consumer and other 66 2 69 5 Total $ 6,828 $ 168 $ 7,129 $ 338 Total impaired loans $ 16,976 $ 281 $ 15,994 $ 626 September 30, 2018 With a related allowance recorded: Commercial and industrial $ 922 $ 81 $ 872 $ 84 Residential real estate: 1-to-4 family mortgage 186 2 189 7 Commercial real estate: Owner occupied 661 7 706 34 Non-owner occupied — — 72 2 Total $ 1,769 $ 90 $ 1,839 $ 127 With no related allowance recorded: Commercial and industrial $ 1,983 $ 21 $ 1,729 $ 80 Construction 1,279 35 1,283 70 Residential real estate: 1-to-4 family mortgage 1,313 15 1,189 60 Residential line of credit 127 8 127 8 Multi-family mortgage 569 2 583 26 Commercial real estate: Owner occupied 1,490 27 1,572 87 Non-owner occupied 1,049 — 1,313 7 Consumer and other 54 1 53 2 Total $ 7,864 $ 109 $ 7,849 $ 340 Total impaired loans $ 9,633 $ 199 $ 9,688 $ 467 Impaired loans recognized in conformity with ASC 310 at September 30, 2019 and December 31, 2018 , segregated by class, were as follows: September 30, 2019 Recorded investment Unpaid principal Related allowance With a related allowance recorded: Commercial and industrial $ 3,081 $ 3,081 $ 13 Residential real estate: 1-to-4 family mortgage 264 324 11 Commercial real estate: Owner occupied 182 220 52 Non-owner occupied 6,796 6,831 405 Consumer and other 395 395 254 Total $ 10,718 $ 10,851 $ 735 With no related allowance recorded Commercial and industrial $ 753 $ 898 $ — Construction 2,061 2,484 — Residential real estate: 1-to-4 family mortgage 1,082 1,400 — Residential line of credit 245 262 — Commercial real estate: Owner occupied 2,294 3,437 — Non-owner occupied 1,050 1,781 — Consumer and other 64 64 — Total $ 7,549 $ 10,326 $ — Total impaired loans $ 18,267 $ 21,177 $ 735 December 31, 2018 Recorded investment Unpaid principal Related allowance With a related allowance recorded: Commercial and industrial $ 618 $ 732 $ 3 Residential real estate: 1-to-4 family mortgage 145 145 7 Commercial real estate: Owner occupied 560 641 53 Non-owner occupied 5,686 5,686 205 Total $ 7,009 $ 7,204 $ 268 With no related allowance recorded: Commercial and industrial $ 1,229 $ 1,281 $ — Construction 1,221 1,262 — Residential real estate: 1-to-4 family mortgage 842 1,151 — Residential line of credit 245 249 — Commercial real estate: Owner occupied 2,048 2,780 — Non-owner occupied 1,049 1,781 — Consumer and other 73 73 — Total $ 6,707 $ 8,577 $ — Total impaired loans $ 13,716 $ 15,781 $ 268
Financial Effect of TDRs	The following tables present the financial effect of TDRs recorded during the periods indicated. Three Months Ended September 30, 2019 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial and industrial 1 $ 16 $ 16 $ — Construction 1 1,070 1,070 — Commercial real estate: Owner occupied 1 927 927 — Non-owner occupied 1 1,366 1,366 106 Residential real estate: 1-to-4 family mortgage 1 128 128 — Total 5 $ 3,507 $ 3,507 $ 106 Three Months Ended September 30, 2018 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial real estate: Owner occupied 1 $ 143 $ 143 $ — Consumer and other 4 55 55 — Total 5 $ 198 $ 198 $ — Nine Months Ended September 30, 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 1 1,070 1,070 — Commercial real estate: Owner occupied 1 927 927 — Non-owner occupied 1 1,366 1,366 106 Residential real estate: 1-to-4 family mortgage 1 128 128 — Total 7 $ 6,695 $ 6,695 $ 106 Nine Months Ended September 30, 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 $ —

Other real estate owned (Tables

Other real estate owned (Tables)	9 Months Ended
	Sep. 30, 2019
Real Estate [Abstract]
Summary of Other Real Estate Owned	The following table summarizes the other real estate owned for the three and nine months ended September 30, 2019 and 2018 : Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Balance at beginning of period $15,521 $ 14,639 $ 12,643 $ 16,442 Transfers from loans 1,535 476 3,565 1,490 Transfers from premises and equipment — — 2,640 — Proceeds from sale of other real estate owned (854 ) (1,457 ) (2,718 ) (3,666 ) Gain on sale of other real estate owned 260 205 582 213 Loans provided for sales of other real estate owned — (191 ) (166 ) (636 ) Write-downs and partial liquidations (386 ) (85 ) (470 ) (256 ) Balance at end of period $16,076 $ 13,587 $ 16,076 $ 13,587

Goodwill and intangible assets

Goodwill and intangible assets (Tables)	9 Months Ended
	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table summarizes changes in goodwill during the nine months ended September 30, 2019 . There was no such activity during the nine months ended September 30, 2018 . Goodwill Balance at December 31, 2018 $ 137,190 Addition from acquisition of Atlantic Capital branches (see Note 2) 31,396 Impairment due to sale of third party origination ("TPO") mortgage delivery channel (100 ) Balance at September 30, 2019 $ 168,486
Schedule of Core Deposit and Other Intangibles	The change in core deposit and other intangibles during the three and nine months ended September 30, 2019 and 2018 is as follows: Core deposit and other intangibles Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Beginning Balance $ 19,945 $ 13,203 $ 11,628 $ 14,902 Addition of core deposit intangible from acquisition of Atlantic Capital branches (see Note 2) — — 10,760 — Reclassification of leasehold intangible (1) — — (460 ) — Less: amortization expense (2) (1,197 ) (800 ) (3,180 ) (2,499 ) Ending Balance $ 18,748 $ 12,403 $ 18,748 $ 12,403 (1) The Company adopted ASU 2016-02 "Leases" (Topic 842) on January 1, 2019 and reclassified $460 of leasehold intangibles to Operating lease right-of-use asset. (2) The three and nine months ended September 30, 2018 includes $23 and $67 , respectively, of amortization expense related to leasehold intangibles included in occupancy and equipment expense.
Schedule of Estimated Aggregate Amortization Expense of Core Deposit and Other Intangibles	The estimated aggregate future amortization expense of the core deposit and other intangibles is as follows: Remainder of 2019 $ 1,159 December 31, 2020 4,262 December 31, 2021 3,663 December 31, 2022 2,973 December 31, 2023 2,247 Thereafter 4,444 $ 18,748

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Lease, Cost	Information related to the Company's operating leases is presented below: September 30, 2019 Right-of-use assets $ 34,812 Lease liabilities 37,760 Weighted average remaining lease term (in years) 14.43 Weighted average discount rate 3.46 % The components of lease expense included in Occupancy and equipment expense were as follows: Three Months Ended Nine Months Ended September 30, 2019 September 30, 2019 Operating lease cost $ 1,260 $ 3,875 Short-term lease cost 81 239 Variable lease cost 146 580 Total lease cost $ 1,487 $ 4,694
Lessee, Operating Lease, Liability, Maturity	Lease expense for the three and nine months ended September 30, 2018 , prior to the adoption of ASU 2016-02, was $1,295 and $3,786 , respectively. A maturity analysis of operating le

Mortgage servicing rights (Tabl

Mortgage servicing rights (Tables)	9 Months Ended
	Sep. 30, 2019
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 three and nine months ended September 30, 2019 and 2018 : Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Carrying value at beginning of period $ 66,380 $ 109,449 $ 88,829 $ 76,107 Capitalization 10,387 11,741 30,319 41,555 Sales — (39,428 ) (29,160 ) (39,428 ) Change in fair value: Due to pay-offs/pay-downs (5,050 ) (3,339 ) (10,150 ) (8,606 ) Due to change in valuation inputs or assumptions (5,561 ) 1,467 (13,682 ) 10,262 Carrying value at period end $ 66,156 $ 79,890 $ 66,156 $ 79,890
Schedule of Servicing Income and Expense Included in Mortgage Banking Income	The following table summarizes servicing income and expense included in mortgage banking income and other noninterest expense within the Mortgage Segment operating results, respectively, for the three and nine months ended September 30, 2019 and 2018 , respectively: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Servicing income: Servicing income $ 3,960 $ 5,576 $ 12,763 $ 15,973 Change in fair value of mortgage servicing rights (10,611 ) (1,872 ) (23,832 ) 1,656 Change in fair value of derivative hedging instruments 5,520 (829 ) 13,060 (7,848 ) Servicing income (1,131 ) 2,875 1,991 9,781 Servicing expenses 1,732 2,114 4,961 5,987 Net servicing (loss) income (1) $ (2,863 ) $ 761 $ (2,970 ) $ 3,794 (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 September 30, 2019 and December 31, 2018 are as follows: September 30, December 31, 2019 2018 Unpaid principal balance $ 6,297,723 $ 6,755,114 Weighted-average prepayment speed (CPR) 11.64 % 8.58 % Estimated impact on fair value of a 10% increase $ (2,743 ) $ (2,072 ) Estimated impact on fair value of a 20% increase $ (5,278 ) $ (4,006 ) Discount rate 8.58 % 10.45 % Estimated impact on fair value of a 100 bp increase $ (2,568 ) $ (2,505 ) Estimated impact on fair value of a 200 bp increase $ (4,946 ) $ (4,807 ) Weighted-average coupon interest rate 4.32 % 4.21 % Weighted-average servicing fee (basis points) 29 30 Weighted-average remaining maturity (in months) 336 325

Income taxes (Tables)

Income taxes (Tables)	9 Months Ended
	Sep. 30, 2019
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: Three Months Ended September 30, 2019 2018 Current $ 9,167 $ 13,367 Deferred (1,449 ) (6,665 ) Total $ 7,718 $ 6,702 Nine Months Ended September 30, 2019 2018 Current $ 25,907 $ 15,562 Deferred (5,900 ) 4,416 Total $ 20,007 $ 19,978
Schedule of Reconciliation of Income Taxes Computed at the United States Federal Statutory Tax Rates to the Provision for Income Taxes	Federal income tax expense differs from the statutory federal rate of 21% for the three and nine months ended September 30, 2019 and 2018 due to the following: Three Months Ended September 30, 2019 2018 Federal taxes calculated at statutory rate $ 6,653 21.0 % $ 5,897 21.0 % Increase (decrease) resulting from: State taxes, net of federal benefit 1,512 4.7 % 1,187 4.2 % Benefit of equity based compensation (275 ) (0.9 )% (115 ) (0.4 )% Municipal interest income, net of interest disallowance (211 ) (0.7 )% (213 ) (0.8 )% Bank owned life insurance (11 ) 0.1 % (13 ) — % Other 50 0.2 % (41 ) (0.1 )% Income tax expense, as reported $ 7,718 24.4 % $ 6,702 23.9 % Nine Months Ended September 30, 2019 2018 Federal taxes calculated at statutory rate $ 17,272 21.0 % $ 17,467 21.0 % Increase (decrease) resulting from: State taxes, net of federal benefit 3,855 4.7 % 3,873 4.6 % Benefit of equity based compensation (668 ) (0.8 )% (866 ) (1.0 )% Municipal interest income, net of interest disallowance (650 ) (0.8 )% (621 ) (0.8 )% Bank owned life insurance (38 ) (0.1 )% (38 ) (0.1 )% Stock offering costs — — % 141 0.2 % Other 236 0.3 % 22 0.1 % Income tax expense, as reported $ 20,007 24.3 % $ 19,978 24.0 %
Schedule of Net Deferred Tax liability	The components of the net deferred tax liability at September 30, 2019 and December 31, 2018 , are as follows: September 30, December 31, 2019 2018 Deferred tax assets: Allowance for loan losses $ 8,198 $ 7,539 Operating lease liability 9,839 — Amortization of core deposit intangible 1,273 1,012 Deferred compensation 5,891 5,878 Unrealized loss on available-for-sale debt securities 115 3,299 Other 2,451 1,998 Subtotal 27,767 19,726 Deferred tax liabilities: FHLB stock dividends (550 ) (550 ) Operating lease - right of use asset (9,514 ) — Depreciation (4,466 ) (4,812 ) Cash flow hedges (3,418 ) (736 ) Mortgage servicing rights (17,342 ) (23,146 ) Goodwill (8,244 ) (6,583 ) Other (901 ) (562 ) Subtotal (44,435 ) (36,389 ) Net deferred tax liability $ (16,668 ) $ (16,663 )

Commitments and contingencies (

Commitments and contingencies (Tables)	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Summary of Financial instruments with Off-Balance Sheet Credit Risk	The same credit policies are used to make such commitments as are used for loans, including obtaining collateral at exercise of the commitment. September 30, December 31, 2019 2018 Commitments to extend credit, excluding interest rate lock commitments $ 1,188,160 $ 1,032,390 Letters of credit 22,376 19,024 Balance at end of period $ 1,210,536 $ 1,051,414
Summary of Allowance for Loan Repurchases or Indemnifications	The following table summarizes the activity in the repurchase reserve: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Balance at beginning of period $ 3,407 $ 3,646 $ 3,273 $ 3,386 Provision for loan repurchases or indemnifications 107 206 255 598 Recoveries on previous losses (79 ) (115 ) (93 ) (247 ) Balance at end of period $ 3,435 $ 3,737 $ 3,435 $ 3,737

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Financial Instruments	The following table provides details on the Company’s derivative financial instruments as of the dates presented: September 30, 2019 Notional Amount Asset Liability Not designated as hedging: Interest rate contracts $ 427,468 $ 19,050 $ 19,050 Forward commitments 824,724 582 — Interest rate-lock commitments 679,524 9,142 — Futures contracts 270,000 398 — Option contracts — — — Total $ 2,201,716 $ 29,172 $ 19,050 December 31, 2018 Notional Amount Asset Liability Not designated as hedging: Interest rate contracts $ 295,333 $ 6,679 $ 6,679 Forward commitments 474,208 — 4,958 Interest rate-lock commitments 318,706 6,241 — Futures contracts 166,000 649 — Options contracts 3,800 26 — Total $ 1,258,047 $ 13,595 $ 11,637 September 30, 2019 Notional Amount Asset Liability Designated as hedging: Interest rate swaps $ 30,000 $ — $ 837 December 31, 2018 Notional Amount Asset Liability Designated as hedging: Interest rate swaps $ 30,000 $ 721 $ —
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: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Not designated as hedging instruments (included in mortgage banking income): Interest rate lock commitments $ 447 $ (3,415 ) $ 4,202 $ (688 ) Forward commitments (3,227 ) 1,524 (12,895 ) 7,477 Futures contracts 4,685 (563 ) 10,663 (4,379 ) Option contracts 3 (55 ) 47 (50 ) Total $ 1,908 $ (2,509 ) $ 2,017 $ 2,360 Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Designated as hedging: Amount of gain reclassified from other comprehensive $ 130 $ 69 $ 343 $ 62 Gain included in interest expense on borrowings 19 20 113 64 Total $ 149 $ 89 $ 456 $ 126 The following discloses the amount included in other comprehensive income (loss), net of tax, for derivative instruments designated as cash flow hedges for the periods presented: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Designated as hedging: Amount of (loss) gain recognized in other comprehensive income, net of tax $ (256 ) $ 169 $ (1,151 ) $ 1,638

Fair value of financial instr_2

Fair value of financial instruments (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Estimated Fair 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 September 30, 2019 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 242,997 $ 242,997 $ — $ — $ 242,997 Investment securities 671,781 — 671,781 — 671,781 Loans, net 4,313,880 — — 4,299,499 4,299,499 Loans held for sale 305,493 — 305,493 — 305,493 Interest receivable 17,729 — 3,263 14,466 17,729 Mortgage servicing rights 66,156 — — 66,156 66,156 Derivatives 29,172 — 29,172 — 29,172 Financial liabilities: Deposits: Without stated maturities $ 3,725,500 $ 3,725,500 $ — $ — $ 3,725,500 With stated maturities 1,196,263 — 1,208,205 — 1,208,205 Securities sold under agreement to 26,199 26,199 — — 26,199 Federal Home Loan Bank advances 250,000 — 251,799 — 251,799 Subordinated debt 30,930 — 29,760 — 29,760 Interest payable 6,102 356 5,746 — 6,102 Derivatives 19,887 — 19,887 — 19,887 Fair Value December 31, 2018 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 125,356 $ 125,356 $ — $ — $ 125,356 Investment securities 658,805 — 658,805 — 658,805 Loans, net 3,638,579 — — 3,630,500 3,630,500 Loans held for sale 278,815 — 278,815 — 278,815 Interest receivable 14,503 — 2,848 11,655 14,503 Mortgage servicing rights 88,829 — — 88,829 88,829 Derivatives 14,316 — 14,316 — 14,316 Financial liabilities: Deposits: Without stated maturities $ 3,051,972 $ 3,051,972 $ — $ — $ 3,051,972 With stated maturities 1,119,745 — 1,122,076 — 1,122,076 Securities sold under agreement to 15,081 15,081 — — 15,081 Federal Home Loan Bank advances 181,765 — 181,864 — 181,864 Subordinated debt 30,930 — 30,000 — 30,000 Interest payable 5,015 530 4,485 — 5,015 Derivatives 11,637 — 11,637 — 11,637
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, 2018 are presented in the following table: At December 31, 2018 Quoted prices in active markets for identical assets (liabilities) (level 1) Significant other observable inputs (level 2) Significant unobservable inputs (level 3) Total Recurring valuations: Financial assets: Available-for-sale securities: U.S. government agency securities $ — $ 989 $ — $ 989 Mortgage-backed securities — 508,580 — 508,580 Municipals, tax-exempt — 138,887 — 138,887 Treasury securities — 7,242 — 7,242 Equity securities — 3,107 — 3,107 Total $ — $ 658,805 $ — $ 658,805 Loans held for sale $ — $ 278,815 $ — $ 278,815 Mortgage servicing rights — — 88,829 88,829 Derivatives — 14,316 — 14,316 Financial Liabilities: Derivatives — 11,637 — 11,637 The balances and levels of the assets measured at fair value on a recurring basis at September 30, 2019 are presented in the following table: September 30, 2019 Quoted prices in active markets for identical assets (liabilities) (level 1) Significant other observable inputs (level 2) Significant unobservable inputs (level 3) Total Recurring valuations: Financial assets: Available-for-sale securities: U.S. government agency securities $ — $ 999 $ — $ 999 Mortgage-backed securities — 485,300 — 485,300 Municipals, tax-exempt — 173,785 — 173,785 Treasury securities — 7,432 — 7,432 Corporate securities — 1,015 — 1,015 Equity securities — 3,250 — 3,250 Total $ — $ 671,781 $ — $ 671,781 Loans held for sale $ — $ 305,493 $ — $ 305,493 Mortgage servicing rights — — 66,156 66,156 Derivatives — 29,172 — 29,172 Financial Liabilities: Derivatives — 19,887 — 19,887
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, 2018 are presented in the following table: At December 31, 2018 Quoted prices in active markets for identical assets (liabilities) (level 1) Significant other observable inputs (level 2) Significant unobservable inputs (level 3) Total Non-recurring valuations: Financial assets: Other real estate owned $ — $ — $ 2,266 $ 2,266 Impaired Loans (1) : Commercial and industrial $ — $ — $ 732 $ 732 Construction — — 832 832 Residential real estate: 1-4 family mortgage — — 146 146 Commercial real estate: Owner occupied — — 87 87 Non-owner occupied — — 6,921 6,921 Total $ — $ — $ 8,718 $ 8,718 (1) Includes both impaired non-purchased loans and collateral-dependent PCI loans. The balances and levels of the assets measured at fair value on a non-recurring basis at September 30, 2019 are presented in the following table: At September 30, 2019 Quoted prices in active markets for identical assets (liabilities) (level 1) Significant other observable inputs (level 2) Significant unobservable inputs (level 3) Total Non-recurring valuations: Financial assets: Other real estate owned $ — $ — $ 6,053 $ 6,053 Impaired loans (1) : Commercial and industrial $ — $ — $ 3,479 $ 3,479 Residential real estate: 1-4 family mortgage — — 315 315 Commercial real estate: Owner occupied — — 260 260 Consumer and other — — 395 395 Total $ — $ — $ 5,815 $ 5,815 (1) Includes both impaired non-purchased loans and collateral-dependent PCI loans.
Reconciliation for Assets and Liabilities Measured at Fair Value on Recurring Basis using Significant Unobservable Inputs or Level 3 Inputs	The following table provides a reconciliation for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs, or Level 3 inputs, during the nine months ended September 30, 2019 and 2018 . There was no activity during the three months ended September 30, 2019 and 2018 . Available-for-sale securities Nine Months Ended September 30, 2019 2018 Balance at beginning of period $ — $ 3,604 Reclassification of equity securities without a readily determinable fair value to other assets — (3,604 ) Balance at end of period $ — $ —
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 September 30, 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 Unobservable inputs Range of inputs Impaired loans (1) $ 5,815 Valuation of collateral Discount for comparable sales 0%-30% Other real estate owned $ 6,053 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. The following table presents information as of December 31, 2018 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 Unobservable inputs Range of inputs Impaired loans (1) $ 8,718 Valuation of collateral Discount for comparable sales 0%-30% Other real estate owned $ 2,266 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.
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 measured at fair value as of September 30, 2019 and December 31, 2018 : September 30, 2019 Aggregate fair value Aggregate Unpaid Principal Balance Difference Mortgage loans held for sale measured at fair value $ 305,493 $ 297,311 $ 8,182 Past due loans of 90 days or more — — — Nonaccrual loans — — — December 31, 2018 Mortgage loans held for sale measured at fair value $ 278,418 $ 267,907 $ 10,511 Past due loans of 90 days or more — — — Nonaccrual loans 397 397 —

Segment reporting (Tables)

Segment reporting (Tables)	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Schedule of Segment Financial Information	The following tables provide segment financial information for the three and nine months ended September 30, 2019 and 2018 as follows: Three Months Ended September 30, 2019 Banking Mortgage Consolidated Net interest income $ 58,350 $ (45 ) $ 58,305 Provision for loan loss 1,831 — 1,831 Mortgage banking income 10,693 23,591 34,284 Change in fair value of mortgage servicing rights, net of hedging (1) — (5,091 ) (5,091 ) Other noninterest income 8,952 — 8,952 Depreciation and amortization 1,255 125 1,380 Amortization of intangibles 1,197 — 1,197 Other noninterest mortgage banking expense 8,087 15,561 23,648 Other noninterest expense (2) 36,598 112 36,710 Income before income taxes $ 29,027 $ 2,657 $ 31,684 Income tax expense 7,718 Net income $ 23,966 Total assets $ 5,730,492 $ 358,403 $ 6,088,895 Goodwill 168,486 — 168,486 (1) Included in mortgage banking income. (2) Included $ 295 in merger costs in the Banking segment related to the Atlantic Capital branch acquisition and the pending Farmers National merger and $ 112 in the Mortgage segment related to mortgage business restructuring charges. Three Months Ended September 30, 2018 Banking Mortgage Consolidated Net interest income $ 52,733 $ 22 $ 52,755 Provision for loan loss 1,818 — 1,818 Mortgage banking income 7,417 21,933 29,350 Change in fair value of mortgage servicing rights, net of hedging (1) — (2,701 ) (2,701 ) Other noninterest income 7,706 — 7,706 Depreciation and amortization 896 117 1,013 Amortization of intangibles 777 — 777 Other noninterest mortgage banking expense 6,383 18,704 25,087 Other noninterest expense 30,336 — 30,336 Income before income taxes $ 27,646 $ 433 $ 28,079 Income tax expense 6,702 Net income $ 21,377 Total assets $ 4,637,097 $ 421,070 $ 5,058,167 Goodwill 137,090 100 137,190 (1) Included in mortgage banking income. Nine Months Ended September 30, 2019 Banking Mortgage Consolidated Net interest income $ 168,322 $ 22 $ 168,344 Provision for loan loss 4,103 — 4,103 Mortgage banking income 20,530 64,982 85,512 Change in fair value of mortgage servicing rights, net of hedging (1) — (10,772 ) (10,772 ) Other noninterest income 25,423 — 25,423 Depreciation and amortization 3,431 399 3,830 Amortization of intangibles 3,180 — 3,180 Other noninterest mortgage banking expense 15,090 50,608 65,698 Other noninterest expense (2) 107,452 1,995 109,447 Income before income taxes $ 81,019 $ 1,230 $ 82,249 Income tax expense 20,007 Net income 62,242 Total assets $ 5,730,492 $ 358,403 $ 6,088,895 Goodwill (3) 168,486 — 168,486 (1) Included in mortgage banking income. (2) Included $ 4,699 in merger costs in the Banking segment related to the Atlantic Capital branch acquisition and the pending Farmers National merger and $ 1,995 in the Mortgage segment related to mortgage business restructuring charges. (3) Recognized $100 of impairment of goodwill related to the sale of the third party origination channel in the Mortgage segment. See Note 6. Goodwill and intangible assets. Nine Months Ended September 30, 2018 Banking Mortgage Consolidated Net interest income $ 153,173 $ (472 ) $ 152,701 Provision for loan loss 3,198 — 3,198 Mortgage banking income 20,419 67,437 87,856 Change in fair value of mortgage servicing rights, net of hedging (1) — (6,192 ) (6,192 ) Other noninterest income 21,729 — 21,729 Depreciation and amortization 2,864 387 3,251 Amortization of intangibles 2,432 — 2,432 Other noninterest mortgage banking expense 17,129 56,926 74,055 Other noninterest expense (2) 89,984 — 89,984 Income before income taxes $ 79,714 $ 3,460 $ 83,174 Income tax expense 19,978 Net income 63,196 Total assets $ 4,637,097 $ 421,070 $ 5,058,167 Goodwill 137,090 100 137,190 (1) Included in mortgage banking income. (2) Included $1,193 in merger costs related to the acquisition of the Clayton Banks and $671 in offering costs in the Banking segment related to the follow-on secondary offering.

Minimum capital requirements (T

Minimum capital requirements (Tables)	9 Months Ended
	Sep. 30, 2019
Banking and Thrift [Abstract]
Schedule of Actual and Required Capital Amounts and Ratios	Actual and required capital amounts and ratios are presented below at period-end. Actual For capital adequacy purposes Minimum Capital adequacy with capital buffer To be well capitalized under prompt corrective action provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio September 30, 2019 Total Capital (to risk-weighted assets) FB Financial Corporation $ 614,708 12.0 % $ 409,805 8.0 % $ 537,870 10.5 % N/A N/A FirstBank 601,769 11.7 % 411,466 8.0 % 540,049 10.5 % $ 514,332 10.0 % Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 583,244 11.3 % $ 309,687 6.0 % $ 438,723 8.5 % N/A N/A FirstBank 570,305 11.1 % 308,273 6.0 % 436,720 8.5 % $ 411,031 8.0 % Tier 1 Capital (to average assets) FB Financial Corporation $ 583,244 10.1 % $ 230,988 4.0 % N/A N/A N/A N/A FirstBank 570,305 9.8 % 232,778 4.0 % N/A N/A $ 290,972 5.0 % Common Equity Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 553,244 10.8 % $ 230,518 4.5 % $ 358,584 7.0 % N/A N/A FirstBank 570,305 11.1 % 231,205 4.5 % 359,652 7.0 % $ 333,962 6.5 % Actual For capital adequacy purposes Minimum Capital adequacy with capital buffer To be well capitalized under prompt corrective action provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio December 31, 2018 Total Capital (to risk-weighted assets) FB Financial Corporation $ 582,945 13.0 % $ 358,735 8.0 % $ 442,814 9.9 % N/A N/A FirstBank 561,327 12.5 % 359,249 8.0 % 443,448 9.9 % $ 449,062 10.0 % Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 554,013 12.4 % $ 268,071 6.0 % $ 351,843 7.9 % N/A N/A FirstBank 532,395 11.9 % 268,434 6.0 % 352,320 7.9 % $ 357,913 8.0 % Tier 1 Capital (to average assets) FB Financial Corporation $ 554,013 11.4 % $ 194,391 4.0 % N/A N/A N/A N/A FirstBank 532,395 10.9 % 195,374 4.0 % N/A N/A $ 244,218 5.0 % Common Equity Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 524,013 11.7 % $ 201,543 4.5 % $ 285,520 6.4 % N/A N/A FirstBank 532,395 11.9 % 201,326 4.5 % 285,212 6.4 % $ 290,804 6.5 %

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Vested and Unvested Restricted Stock Units Outstanding	The following table summarizes information about vested and unvested restricted stock units, excluding cash-settled EBI units discussed above, outstanding at September 30, 2019 and 2018 : Nine Months Ended September 30, 2019 2018 Restricted Stock Units Outstanding Weighted Average Grant Date Fair Value Restricted Stock Units Outstanding Weighted Average Grant Date Fair Value Balance at beginning of period 1,140,215 $ 21.96 1,214,325 $ 19.97 Grants 167,343 34.05 117,459 40.20 Released and distributed (vested) (270,959 ) 24.00 (205,565 ) 21.93 Forfeited/expired (11,727 ) 24.56 (10,035 ) 23.66 Balance at end of period 1,024,872 $ 23.67 1,116,184 $ 21.86

Related party transactions (Tab

Related party transactions (Tables)	9 Months Ended
	Sep. 30, 2019
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, 2019 $ 32,264 New loans and advances 12,160 Change in related party status (9,687 ) Repayments (3,458 ) Loans outstanding at September 30, 2019 $ 31,279

Basis of presentation - Additio

Basis of presentation - Additional Information (Details) $ / shares in Units, $ in Thousands	Oct. 17, 2019USD ($)$ / shares	Sep. 30, 2019USD ($)$ / shares	Sep. 30, 2018$ / shares	Jun. 30, 2018shares	Sep. 30, 2019USD ($)branch$ / shares	Sep. 30, 2018$ / shares	Jan. 01, 2019USD ($)	Dec. 31, 2018USD ($)	Jan. 01, 2018USD ($)
Class of Stock [Line Items]
Number of full-service branches | branch					68
Cash dividends declared (USD per share) | $ / shares		$ 0.08	$ 0.06		$ 0.24	$ 0.12
Operating lease right-of-use assets		$ 34,812			$ 34,812			$ 0
Operating lease liabilities		37,760			37,760			0
Cumulative effect of new accounting principal							$ (1,309)		$ 0
Leasehold improvements		91,815			91,815			86,882
Finite lived intangible assets		$ 18,748			$ 18,748			$ 11,628
Accounting Standards Update 2016-02
Class of Stock [Line Items]
Operating lease right-of-use assets							32,545
Operating lease liabilities							34,876
Secondary Public Offering
Class of Stock [Line Items]
Common stock sold and issued, shares (in shares) | shares				3,680,000
Retained earnings
Class of Stock [Line Items]
Cumulative effect of new accounting principal							(1,309)		$ (109)
Retained earnings | Accounting Standards Update 2016-02
Class of Stock [Line Items]
Cumulative effect of new accounting principal							(1,309)
Cumulative effect of new accounting principle in period of adoption, net of deferred taxes							461
Subsequent Event
Class of Stock [Line Items]
Cash dividends declared (USD per share) | $ / shares	$ 0.08
Dividends declared	$ 2,556
James W. Ayers
Class of Stock [Line Items]
Percentage of voting power (less than)				50.00%
Lease Agreements | Accounting Standards Update 2016-02
Class of Stock [Line Items]
Finite lived intangible assets							460
Leasehold improvements | Accounting Standards Update 2016-02
Class of Stock [Line Items]
Leasehold improvements							$ 1,022

Basis of presentation - Schedul

Basis of presentation - Schedule of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic earnings per common share calculation:
Net income	$ 23,966	$ 21,377	$ 62,242	$ 63,196
Dividends paid on and undistributed earnings allocated to participating securities	(128)	(114)	(333)	(337)
Earnings attributable to common shareholders	$ 23,838	$ 21,263	$ 61,909	$ 62,859
Weighted-average basic shares outstanding (in shares)	30,899,583	30,692,668	30,849,035	30,661,852
Basic earnings per common share (in dollars per share)	$ 0.77	$ 0.69	$ 2.01	$ 2.05
Diluted earnings per common share:
Earnings attributable to common shareholders	$ 23,838	$ 21,263	$ 61,909	$ 62,859
Weighted-average basic shares outstanding (in shares)	30,899,583	30,692,668	30,849,035	30,661,852
Weighted-average diluted shares contingently issuable (in shares)	525,990	646,960	529,751	636,802
Weighted-average diluted shares outstanding (in shares)	31,425,573	31,339,628	31,378,786	31,298,654
Diluted earnings per common share (in dollars per share)	$ 0.76	$ 0.68	$ 1.97	$ 2.01

Mergers and acquisitions - Farm

Mergers and acquisitions - Farmers National Bank Narrative (Details) - Farmers National Bank of Scottsville $ / shares in Units, $ in Thousands	Sep. 17, 2019USD ($)$ / sharesshares	Sep. 30, 2019USD ($)branch
Business Acquisition [Line Items]
Number of branches | branch		5
Assets assumed in acquisition		$ 251,216
Loans assumed in acquisition		174,850
Deposits assumed in acquisition		$ 201,909
Business acquisition, shares issued (in shares) | shares	954,827
Cash purchase price	$ 15,000
Business acquisition, share price | $ / shares	$ 38.26
Business combination, consideration, value	$ 51,900

Mergers and acquisitions - Atla

Mergers and acquisitions - Atlantic Capital Bank Narrative (Details) $ in Thousands	Apr. 05, 2019USD ($)branch	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Business Acquisition [Line Items]
Goodwill		$ 168,486	$ 137,190	$ 168,486	$ 137,190	$ 137,190
Merger related expenses		295	$ 0	4,699	$ 1,193
Atlantic Capital Bank
Business Acquisition [Line Items]
Transaction value	$ 36,790
Deposits assumed in acquisition	$ 588,877
Deposit premium percentage	6.25%
Loans, net of fair value adjustments	$ 374,966
Percent of book value for acquired loans	99.32%
Goodwill	$ 31,396
Merger related expenses		$ 199		$ 4,614
TENNESSEE | Atlantic Capital Bank
Business Acquisition [Line Items]
Number of branches acquired | branch	11
GEORGIA | Atlantic Capital Bank
Business Acquisition [Line Items]
Number of branches acquired | branch	3

Mergers and acquisitions - Sche

Mergers and acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - Atlantic Capital Bank $ in Thousands	Apr. 05, 2019USD ($)
Assets
Cash and cash equivalents	$ 207,822
Loans, net of fair value adjustments	374,966
Premises and equipment	9,650
Operating lease right-of-use assets	4,133
Core deposit intangible	10,760
Accrued interest and other assets	1,271
Total assets	608,602
Liabilities
Non-interest bearing deposits	118,405
Interest-bearing checking	112,225
Money markey and savings	211,135
Interest-bearing deposits	147,112
Total deposits	588,877
Operating lease liabilities	9,572
Operating lease liabilities	4,133
Accrued expenses and other liabilities	626
Total liabilities	603,208
Net assets acquired	5,394
Deposit premium	36,790
Cash and equivalents received	$ 171,032

Mergers and acquisitions - Sc_2

Mergers and acquisitions - Schedule of Consideration Paid and Allocation of Purchase Price to Net Assets Acquired (Details) - USD ($) $ in Thousands	Apr. 05, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Preliminary allocation of consideration:
Goodwill		$ 168,486	$ 137,190	$ 137,190
Atlantic Capital Bank
Purchase price:
Deposit premium	$ 36,790
Preliminary allocation of consideration:
Fair value of net assets acquired including identifiable intangible assets	5,394
Goodwill	31,396
Total consideration paid	$ 36,790

Mergers and acquisitions - Loan

Mergers and acquisitions - Loans and Debt Securities Acquired with Deteriorated Credit Quality (Details) - Atlantic Capital Bank $ in Thousands	Apr. 05, 2019USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually-required principal and interest	$ 11,374
Nonaccretable difference	1,615
Best estimate of contractual cash flows expected to be collected	9,759
Accretable yield	1,167
Fair value	$ 8,592

Mergers and acquisitions - Busi

Mergers and acquisitions - Business Acquisition, Pro Forma Information (Details) - Atlantic Capital Bank - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Net interest income	$ 58,305	$ 56,522	$ 171,915	$ 165,209
Total revenues	96,450	91,688	272,868	271,099
Net income	$ 23,966	$ 20,283	$ 59,745	$ 60,680

Investment securities - Summary

Investment securities - Summary of Amortized Cost of Securities and Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Amortized cost	$ 656,095	$ 668,033
Gross unrealized gains	14,570	2,756
Gross unrealized losses	(2,134)	(15,091)
Fair Value	668,531	655,698
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost	1,000	1,000
Gross unrealized gains	0	0
Gross unrealized losses	(1)	(11)
Fair Value	999	989
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Amortized cost	481,580	520,654
Gross unrealized gains	5,784	1,191
Gross unrealized losses	(2,064)	(13,265)
Fair Value	485,300	508,580
Municipals, tax exempt
Debt Securities, Available-for-sale [Abstract]
Amortized cost	165,100	138,994
Gross unrealized gains	8,754	1,565
Gross unrealized losses	(69)	(1,672)
Fair Value	173,785	138,887
Treasury securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost	7,415	7,385
Gross unrealized gains	17	0
Gross unrealized losses	0	(143)
Fair Value	7,432	$ 7,242
Corporate securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost	1,000
Gross unrealized gains	15
Gross unrealized losses	0
Fair Value	$ 1,015

Investment securities - Narrati

Investment securities - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)security	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)security	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)security
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	$ 3,250,000		$ 3,250,000		$ 3,107,000
Available-for-sale securities	656,095,000		656,095,000		$ 668,033,000
Net gains (losses) on marketable equity securities	$ 55,000	$ (27,000)	$ 151,000	$ (108,000)
Number of securities in securities portfolio | security	359		359		360
Number of securities in securities portfolio, unrealized loss position | security	57		57		174
Other than temporary impairment	$ 0	$ 0	$ 0	$ 0
Trade Date Payables
Debt and Equity Securities, FV-NI [Line Items]
Available-for-sale securities	3,671,000		3,671,000		$ 2,120,000
Collateral Pledged
Debt and Equity Securities, FV-NI [Line Items]
Securities pledged	$ 329,681,000		$ 329,681,000		$ 326,215,000

Investment securities - Schedul

Investment securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Amortized cost
Amortized cost, due in one year or less	$ 5,292	$ 15,883
Amortized costs, due in one to five years	12,477	13,806
Amortized cost, due in five to ten years	15,412	18,539
Amortized cost, due in over ten years	141,334	99,151
Amortized cost, total	174,515	147,379
Mortgage-backed securities - residential, amortized cost	481,580	520,654
Amortized cost	656,095	668,033
Fair value
Fair value, due in one year or less	5,312	16,028
Fair value, due in one to five years	12,601	13,740
Fair value, due in five to ten years	15,978	18,387
Fair value, due in over ten years	149,340	98,963
Fair value, total	183,231	147,118
Mortgage-backed securities - residential, fair value	485,300	508,580
Total debt securities, Fair value	$ 668,531	$ 655,698

Investment securities - Summa_2

Investment securities - Summary of Sales and Other Dispositions of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Sales	$ 22,740	$ 0	$ 24,498	$ 221
Maturities, prepayments and calls	28,694	20,068	78,861	54,576
Gross realized gains	1	0	7	1
Gross realized losses	$ 76	$ 0	$ 83	$ 9

Investment securities - Sched_2

Investment securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value	$ 37,163	$ 87,858
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	(139)	(844)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	218,384	369,343
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	(1,995)	(14,247)
Debt securities, available-for-sale, continuous unrealized loss position, fair value	255,547	457,201
Debt securities, available-for-sale, unrealized loss position, accumulated loss	(2,134)	(15,091)
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value	0	0
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	0	0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	999	989
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	(1)	(11)
Debt securities, available-for-sale, continuous unrealized loss position, fair value	999	989
Debt securities, available-for-sale, unrealized loss position, accumulated loss	(1)	(11)
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value	26,610	60,347
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	(70)	(478)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	217,385	335,769
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	(1,994)	(12,787)
Debt securities, available-for-sale, continuous unrealized loss position, fair value	243,995	396,116
Debt securities, available-for-sale, unrealized loss position, accumulated loss	(2,064)	(13,265)
Municipals, tax exempt
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value	10,553	27,511
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	(69)	(366)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	0	25,343
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	0	(1,306)
Debt securities, available-for-sale, continuous unrealized loss position, fair value	10,553	52,854
Debt securities, available-for-sale, unrealized loss position, accumulated loss	(69)	(1,672)
Treasury securities
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value	0	0
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	0	0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	0	7,242
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	0	(143)
Debt securities, available-for-sale, continuous unrealized loss position, fair value	0	7,242
Debt securities, available-for-sale, unrealized loss position, accumulated loss	$ 0	$ (143)

Loans and allowance for loan _3

Loans and allowance for loan losses- Loans Outstanding by Major Lending Classification (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	$ 4,345,344		$ 3,667,511
Less: Allowance for loan losses	(31,464)	$ (30,138)	(28,932)	$ (27,608)	$ (26,347)	$ (24,041)
Net loans	4,313,880		3,638,579
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	997,921		867,083
Less: Allowance for loan losses	(5,170)	(4,923)	(5,348)	(5,365)	(4,747)	(4,461)
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	537,784		556,051
Less: Allowance for loan losses	(9,842)	(9,655)	(9,729)	(8,268)	(9,023)	(7,135)
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	710,077		555,815
Less: Allowance for loan losses	(3,331)	(3,288)	(3,428)	(3,520)	(3,378)	(3,197)
Residential real estate: | Residential line of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	215,493		190,480
Less: Allowance for loan losses	(727)	(755)	(811)	(838)	(795)	(944)
Residential real estate: | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	80,352		75,457
Less: Allowance for loan losses	(574)	(617)	(566)	(683)	(391)	(434)
Commercial real estate: | Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	620,635		493,524
Less: Allowance for loan losses	(3,709)	(3,512)	(3,132)	(3,481)	(3,290)	(3,558)
Commercial real estate: | Non-owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	914,502		700,248
Less: Allowance for loan losses	(4,927)	(4,478)	(4,149)	(3,911)	(3,272)	(2,817)
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	268,580		228,853
Less: Allowance for loan losses	$ (3,184)	$ (2,910)	$ (1,769)	$ (1,542)	$ (1,451)	$ (1,495)

Loans and allowance for loan _4

Loans and allowance for loan losses - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Carrying value of PCI loans	$ 63,069,000		$ 63,069,000		$ 68,999,000
Accretion of interest income			6,030,000	$ 5,745,000
Non-accrual loans	3,211,000		3,211,000		2,703,000
Loans	4,345,344,000		4,345,344,000		3,667,511,000
Recorded investment in troubled debt restructurings	11,460,000		11,460,000		6,794,000
Allocation to specific reserves	171,000		171,000		63,000
Payment default for loans modified as troubled debt restructurings	0	$ 0	0	0
Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Carrying value of PCI loans	63,069,000		63,069,000		68,999,000
Purchase accounting liquidity discount			781,000		2,436,000
Purchase accounting non accretable credit discount			4,331,000		4,355,000
Accretion of interest income	1,583,000	2,103,000	5,471,000	6,943,000
Total purchase accounting contribution through accretion for purchased loans	2,102,000	$ 2,130,000	6,030,000	$ 5,745,000
Non-accrual loans	0		0		0
Loans	63,069,000		63,069,000		68,999,000
Non-Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Purchase accounting liquidity discount			4,483,000		2,197,000
Purchase accounting accretable credit discount			10,075,000		7,527,000
Federal Reserve
Financing Receivable, Recorded Investment, Past Due [Line Items]
Pledged loans to the Federal Reserve Bank	1,403,511,000		1,403,511,000		1,336,092,000
Residential Mortgage Loans | Federal Home Loan Bank of Cincinnati
Financing Receivable, Recorded Investment, Past Due [Line Items]
Pledge loans for Federal Home Loan Bank Debt	527,351,000		527,351,000		618,976,000
Commercial Loan | Federal Home Loan Bank of Cincinnati
Financing Receivable, Recorded Investment, Past Due [Line Items]
Pledge loans for Federal Home Loan Bank Debt	521,754,000		521,754,000		608,735,000
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	15,450,000		15,450,000		9,208,000
30-89 Days Past Due | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	3,598,000		3,598,000		3,605,000
90 Days or More and Accruing Interest
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,452,000		2,452,000		3,041,000
90 Days or More and Accruing Interest | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 754,000		$ 754,000		$ 4,076,000

Loans and allowance for loan _5

Loans and allowance for loan losses - Changes in Value of Accretable Yield for PCI Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretion			$ 6,030	$ 5,745
Purchased Credit Impaired
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at the beginning of period	$ (14,862)	$ (20,169)	(16,587)	(17,682)
Additions through the branch acquisition of Atlantic Capital Bank	0	0	(1,167)	0
Principal reductions and other reclassifications from nonaccretable difference	(150)	(84)	100	(3,536)
Accretion	1,583	2,103	5,471	6,943
Changes in expected cash flows	110	6	(1,136)	(3,869)
Balance at end of period	$ (13,319)	$ (18,144)	$ (13,319)	$ (18,144)

Loans and allowance for loan _6

Loans and allowance for loan losses - Allowance for Loan Losses by Portfolio Segment and Related Investment in Loans Net of Unearned Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 30,138	$ 26,347	$ 28,932	$ 24,041
Provision for loan losses	1,831	1,818	4,103	3,198
Recoveries of loans previously charged-off	212	360	787	2,368
Loans charged off	(717)	(917)	(2,358)	(1,999)
Ending balance	31,464	27,608	31,464	27,608
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,923	4,747	5,348	4,461
Provision for loan losses	234	847	17	1,088
Recoveries of loans previously charged-off	16	104	66	374
Loans charged off	(3)	(333)	(261)	(558)
Ending balance	5,170	5,365	5,170	5,365
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,655	9,023	9,729	7,135
Provision for loan losses	186	(754)	105	35
Recoveries of loans previously charged-off	1	13	8	1,127
Loans charged off	0	(14)	0	(29)
Ending balance	9,842	8,268	9,842	8,268
Residential real estate: | 1-to-4 family mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,288	3,378	3,428	3,197
Provision for loan losses	18	47	(77)	235
Recoveries of loans previously charged-off	25	99	62	157
Loans charged off	0	(4)	(82)	(69)
Ending balance	3,331	3,520	3,331	3,520
Residential real estate: | Residential line of credit
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	755	795	811	944
Provision for loan losses	67	25	100	(175)
Recoveries of loans previously charged-off	75	31	121	102
Loans charged off	(170)	(13)	(305)	(33)
Ending balance	727	838	727	838
Residential real estate: | Multi-family mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	617	391	566	434
Provision for loan losses	(43)	292	8	249
Recoveries of loans previously charged-off	0	0	0	0
Loans charged off	0	0	0	0
Ending balance	574	683	574	683
Commercial real estate: | Owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,512	3,290	3,132	3,558
Provision for loan losses	194	236	482	(163)
Recoveries of loans previously charged-off	3	10	95	141
Loans charged off	0	(55)	0	(55)
Ending balance	3,709	3,481	3,709	3,481
Commercial real estate: | Non-owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,478	3,272	4,149	2,817
Provision for loan losses	461	639	790	1,043
Recoveries of loans previously charged-off	0	0	0	51
Loans charged off	(12)	0	(12)	0
Ending balance	4,927	3,911	4,927	3,911
Consumer and other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,910	1,451	1,769	1,495
Provision for loan losses	714	486	2,678	886
Recoveries of loans previously charged-off	92	103	435	416
Loans charged off	(532)	(498)	(1,698)	(1,255)
Ending balance	$ 3,184	$ 1,542	$ 3,184	$ 1,542

Loans and allowance for loan _7

Loans and allowance for loan losses - Allocation of Allowance for Loan Losses by Loan Category Broken Out Between Loans Individually Evaluated for Impairment and Collectively Evaluated for Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 735		$ 268
Collectively evaluated for impairment	29,167		27,783
Acquired with deteriorated credit quality	1,562		881
Ending balance	31,464	$ 30,138	28,932	$ 27,608	$ 26,347	$ 24,041
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	13		3
Collectively evaluated for impairment	5,064		5,247
Acquired with deteriorated credit quality	93		98
Ending balance	5,170	4,923	5,348	5,365	4,747	4,461
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	9,796		9,677
Acquired with deteriorated credit quality	46		52
Ending balance	9,842	9,655	9,729	8,268	9,023	7,135
Residential real estate: | 1-to-4 family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	11		7
Collectively evaluated for impairment	3,173		3,205
Acquired with deteriorated credit quality	147		216
Ending balance	3,331	3,288	3,428	3,520	3,378	3,197
Residential real estate: | Residential line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	727		811
Acquired with deteriorated credit quality	0		0
Ending balance	727	755	811	838	795	944
Residential real estate: | Multi-family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	574		566
Acquired with deteriorated credit quality	0		0
Ending balance	574	617	566	683	391	434
Commercial real estate: | Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	52		53
Collectively evaluated for impairment	3,641		3,066
Acquired with deteriorated credit quality	16		13
Ending balance	3,709	3,512	3,132	3,481	3,290	3,558
Commercial real estate: | Non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	405		205
Collectively evaluated for impairment	4,225		3,628
Acquired with deteriorated credit quality	297		316
Ending balance	4,927	4,478	4,149	3,911	3,272	2,817
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	254		0
Collectively evaluated for impairment	1,967		1,583
Acquired with deteriorated credit quality	963		186
Ending balance	$ 3,184	$ 2,910	$ 1,769	$ 1,542	$ 1,451	$ 1,495

Loans and allowance for loan _8

Loans and allowance for loan losses - Amount of Loans by Loan Category Broken Out Between Loans Individually Evaluated for Impairment and Collectively Evaluated for Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 18,267	$ 13,716
Collectively evaluated for impairment	4,264,008	3,584,796
Fair value	63,069	68,999
Loans	4,345,344	3,667,511
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	3,834	1,847
Collectively evaluated for impairment	992,463	863,788
Fair value	1,624	1,448
Loans	997,921	867,083
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	2,061	1,221
Collectively evaluated for impairment	532,521	549,075
Fair value	3,202	5,755
Loans	537,784	556,051
Residential real estate: | 1-to-4 family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	1,346	987
Collectively evaluated for impairment	687,748	535,451
Fair value	20,983	19,377
Loans	710,077	555,815
Residential real estate: | Residential line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	245	245
Collectively evaluated for impairment	215,175	190,235
Fair value	73	0
Loans	215,493	190,480
Residential real estate: | Multi-family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	80,352	75,457
Fair value	0	0
Loans	80,352	75,457
Commercial real estate: | Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	2,476	2,608
Collectively evaluated for impairment	612,112	484,900
Fair value	6,047	6,016
Loans	620,635	493,524
Commercial real estate: | Non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	7,846	6,735
Collectively evaluated for impairment	894,468	677,247
Fair value	12,188	16,266
Loans	914,502	700,248
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	459	73
Collectively evaluated for impairment	249,169	208,643
Fair value	18,952	20,137
Loans	$ 268,580	$ 228,853

Loans and allowance for loan _9

Loans and allowance for loan losses - Credit Quality Indicators by Portfolio Class (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	$ 4,282,275	$ 3,598,512
Purchased credit impaired loans	63,069	68,999
Loans	4,345,344	3,667,511
Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	4,104,319	3,458,495
Purchased credit impaired loans	0	0
Loans	4,104,319	3,458,495
Watch
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	117,649	95,857
Purchased credit impaired loans	44,495	46,672
Loans	162,144	142,529
Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	60,307	44,160
Purchased credit impaired loans	18,574	22,327
Loans	78,881	66,487
Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	996,297	865,635
Purchased credit impaired loans	1,624	1,448
Loans	997,921	867,083
Commercial and industrial | Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	930,094	804,447
Purchased credit impaired loans	0	0
Commercial and industrial | Watch
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	49,209	52,624
Purchased credit impaired loans	1,023	964
Commercial and industrial | Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	16,994	8,564
Purchased credit impaired loans	601	484
Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	534,582	550,296
Purchased credit impaired loans	3,202	5,755
Loans	537,784	556,051
Construction | Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	528,358	543,953
Purchased credit impaired loans	0	0
Construction | Watch
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	4,074	5,012
Purchased credit impaired loans	2,994	3,229
Construction | Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	2,150	1,331
Purchased credit impaired loans	208	2,526
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	689,094	536,438
Purchased credit impaired loans	20,983	19,377
Loans	710,077	555,815
Residential real estate: | Residential line of credit
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	215,420	190,480
Purchased credit impaired loans	73	0
Loans	215,493	190,480
Residential real estate: | Multi-family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	80,352	75,457
Purchased credit impaired loans	0	0
Loans	80,352	75,457
Residential real estate: | Pass | 1-to-4 family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	666,942	519,541
Purchased credit impaired loans	0	0
Residential real estate: | Pass | Residential line of credit
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	212,556	186,753
Purchased credit impaired loans	0	0
Residential real estate: | Pass | Multi-family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	80,285	75,381
Purchased credit impaired loans	0	0
Residential real estate: | Watch | 1-to-4 family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	8,254	8,697
Purchased credit impaired loans	16,540	14,681
Residential real estate: | Watch | Residential line of credit
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	1,171	1,039
Purchased credit impaired loans	0	0
Residential real estate: | Watch | Multi-family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	67	76
Purchased credit impaired loans	0	0
Residential real estate: | Substandard | 1-to-4 family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	13,898	8,200
Purchased credit impaired loans	4,443	4,696
Residential real estate: | Substandard | Residential line of credit
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	1,693	2,688
Purchased credit impaired loans	73	0
Residential real estate: | Substandard | Multi-family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	0	0
Purchased credit impaired loans	0	0
Commercial real estate: | Owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	614,588	487,508
Purchased credit impaired loans	6,047	6,016
Loans	620,635	493,524
Commercial real estate: | Non-owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	902,314	683,982
Purchased credit impaired loans	12,188	16,266
Loans	914,502	700,248
Commercial real estate: | Pass | Owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	574,582	456,694
Purchased credit impaired loans	0	0
Commercial real estate: | Pass | Non-owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	868,007	667,447
Purchased credit impaired loans	0	0
Commercial real estate: | Watch | Owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	25,962	16,765
Purchased credit impaired loans	4,244	4,110
Commercial real estate: | Watch | Non-owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	25,597	8,881
Purchased credit impaired loans	5,620	8,266
Commercial real estate: | Substandard | Owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	14,044	14,049
Purchased credit impaired loans	1,803	1,906
Commercial real estate: | Substandard | Non-owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	8,710	7,654
Purchased credit impaired loans	6,568	8,000
Consumer and other
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	249,628	208,716
Purchased credit impaired loans	18,952	20,137
Loans	268,580	228,853
Consumer and other | Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	243,495	204,279
Purchased credit impaired loans	0	0
Consumer and other | Watch
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	3,315	2,763
Purchased credit impaired loans	14,074	15,422
Consumer and other | Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	2,818	1,674
Purchased credit impaired loans	$ 4,878	$ 4,715

Loans and allowance for loan_10

Loans and allowance for loan losses - Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 4,345,344	$ 3,667,511
Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	63,069	68,999
Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	17,911	13,685
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	15,450	9,208
30-89 Days Past Due | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	3,598	3,605
90 Days or More and Accruing Interest
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,452	3,041
90 Days or More and Accruing Interest | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	754	4,076
Financing Receivables Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,246,462	3,572,578
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	997,921	867,083
Commercial and industrial | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,624	1,448
Commercial and industrial | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	383	438
Commercial and industrial | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	3,892	999
Commercial and industrial | 90 Days or More and Accruing Interest
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4	65
Commercial and industrial | Financing Receivables Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	992,018	864,133
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	537,784	556,051
Construction | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	3,202	5,755
Construction | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,107	283
Construction | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	327	109
Construction | 90 Days or More and Accruing Interest
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Construction | Financing Receivables Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	533,148	549,904
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	710,077	555,815
Residential real estate: | 1-to-4 family mortgage | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	20,983	19,377
Residential real estate: | 1-to-4 family mortgage | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	7,260	2,704
Residential real estate: | Residential line of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	215,493	190,480
Residential real estate: | Residential line of credit | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	73	0
Residential real estate: | Residential line of credit | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	421	804
Residential real estate: | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	80,352	75,457
Residential real estate: | Multi-family mortgage | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Residential real estate: | Multi-family mortgage | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Residential real estate: | 30-89 Days Past Due | 1-to-4 family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,552	4,919
Residential real estate: | 30-89 Days Past Due | Residential line of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	475	726
Residential real estate: | 30-89 Days Past Due | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Residential real estate: | 90 Days or More and Accruing Interest | 1-to-4 family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,316	737
Residential real estate: | 90 Days or More and Accruing Interest | Residential line of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	298	957
Residential real estate: | 90 Days or More and Accruing Interest | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Residential real estate: | Financing Receivables Current | 1-to-4 family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	674,966	528,078
Residential real estate: | Financing Receivables Current | Residential line of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	214,226	187,993
Residential real estate: | Financing Receivables Current | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	80,352	75,457
Commercial real estate: | Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	620,635	493,524
Commercial real estate: | Owner occupied | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,047	6,016
Commercial real estate: | Owner occupied | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,274	2,423
Commercial real estate: | Non-owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	914,502	700,248
Commercial real estate: | Non-owner occupied | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	12,188	16,266
Commercial real estate: | Non-owner occupied | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,596	6,885
Commercial real estate: | 30-89 Days Past Due | Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	153	407
Commercial real estate: | 30-89 Days Past Due | Non-owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,605	61
Commercial real estate: | 90 Days or More and Accruing Interest | Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	197
Commercial real estate: | 90 Days or More and Accruing Interest | Non-owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5	77
Commercial real estate: | Financing Receivables Current | Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	613,161	484,481
Commercial real estate: | Financing Receivables Current | Non-owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	893,108	676,959
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	268,580	228,853
Consumer and other | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	18,952	20,137
Consumer and other | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	870	148
Consumer and other | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,446	1,987
Consumer and other | 90 Days or More and Accruing Interest
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	829	1,008
Consumer and other | Financing Receivables Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 245,483	$ 205,573

Loans and allowance for loan_11

Loans and allowance for loan losses - Impaired Loans Recognized, Segregated by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	$ 10,718	$ 7,009
Impaired loans with related allowance, unpaid principal	10,851	7,204
Impaired loans with related allowance, related allowance	735	268
Impaired loan with no related allowance, recorded investment	7,549	6,707
Impaired loan with no related allowance, unpaid principal	10,326	8,577
Total impaired loans, recorded investment	18,267	13,716
Total impaired loans, unpaid principal	21,177	15,781
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	3,081	618
Impaired loans with related allowance, unpaid principal	3,081	732
Impaired loans with related allowance, related allowance	13	3
Impaired loan with no related allowance, recorded investment	753	1,229
Impaired loan with no related allowance, unpaid principal	898	1,281
Construction
Financing Receivable, Impaired [Line Items]
Impaired loan with no related allowance, recorded investment	2,061	1,221
Impaired loan with no related allowance, unpaid principal	2,484	1,262
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	264	145
Impaired loans with related allowance, unpaid principal	324	145
Impaired loans with related allowance, related allowance	11	7
Impaired loan with no related allowance, recorded investment	1,082	842
Impaired loan with no related allowance, unpaid principal	1,400	1,151
Residential real estate: | Residential line of credit
Financing Receivable, Impaired [Line Items]
Impaired loan with no related allowance, recorded investment	245	245
Impaired loan with no related allowance, unpaid principal	262	249
Commercial real estate: | Owner occupied
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	182	560
Impaired loans with related allowance, unpaid principal	220	641
Impaired loans with related allowance, related allowance	52	53
Impaired loan with no related allowance, recorded investment	2,294	2,048
Impaired loan with no related allowance, unpaid principal	3,437	2,780
Commercial real estate: | Non-owner occupied
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	6,796	5,686
Impaired loans with related allowance, unpaid principal	6,831	5,686
Impaired loans with related allowance, related allowance	405	205
Impaired loan with no related allowance, recorded investment	1,050	1,049
Impaired loan with no related allowance, unpaid principal	1,781	1,781
Consumer and other
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	395
Impaired loans with related allowance, unpaid principal	395
Impaired loans with related allowance, related allowance	254
Impaired loan with no related allowance, recorded investment	64	73
Impaired loan with no related allowance, unpaid principal	$ 64	$ 73

Loans and allowance for loan_12

Loans and allowance for loan losses - Impaired Loans Recognized, Recorded Investment and Interest Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, average recorded investment	$ 10,148	$ 1,769	$ 8,865	$ 1,839
Impaired loan with no related allowance, average recorded investment	6,828	7,864	7,129	7,849
Total impaired loans, average recorded investment	16,976	9,633	15,994	9,688
Impaired loans with related allowance, interest income recognized (cash basis)	113	90	288	127
Impaired loan with no related allowance, interest income recognized (cash basis)	168	109	338	340
Total impaired loans, interest income recognized (cash basis)	281	199	626	467
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, average recorded investment	3,109	922	1,850	872
Impaired loan with no related allowance, average recorded investment	766	1,983	991	1,729
Impaired loans with related allowance, interest income recognized (cash basis)	51	81	156	84
Impaired loan with no related allowance, interest income recognized (cash basis)	11	21	36	80
Construction
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, average recorded investment	0		0
Impaired loan with no related allowance, average recorded investment	1,639	1,279	1,641	1,283
Impaired loans with related allowance, interest income recognized (cash basis)	0		0
Impaired loan with no related allowance, interest income recognized (cash basis)	90	35	142	70
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, average recorded investment	265	186	205	189
Impaired loan with no related allowance, average recorded investment	835	1,313	962	1,189
Impaired loans with related allowance, interest income recognized (cash basis)	2	2	13	7
Impaired loan with no related allowance, interest income recognized (cash basis)	24	15	50	60
Residential real estate: | Residential line of credit
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, average recorded investment	0		0
Impaired loan with no related allowance, average recorded investment	427	127	245	127
Impaired loans with related allowance, interest income recognized (cash basis)	0		0
Impaired loan with no related allowance, interest income recognized (cash basis)	0	8	2	8
Residential real estate: | Multi-family mortgage
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, average recorded investment	0		0
Impaired loan with no related allowance, average recorded investment	0	569	0	583
Impaired loans with related allowance, interest income recognized (cash basis)	0		0
Impaired loan with no related allowance, interest income recognized (cash basis)	0	2	0	26
Commercial real estate: | Owner occupied
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, average recorded investment	184	661	371	706
Impaired loan with no related allowance, average recorded investment	2,045	1,490	2,171	1,572
Impaired loans with related allowance, interest income recognized (cash basis)	4	7	10	34
Impaired loan with no related allowance, interest income recognized (cash basis)	41	27	103	87
Commercial real estate: | Non-owner occupied
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, average recorded investment	6,143	0	6,241	72
Impaired loan with no related allowance, average recorded investment	1,050	1,049	1,050	1,313
Impaired loans with related allowance, interest income recognized (cash basis)	56	0	90	2
Impaired loan with no related allowance, interest income recognized (cash basis)	0	0	0	7
Consumer and other
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, average recorded investment	447		198
Impaired loan with no related allowance, average recorded investment	66	54	69	53
Impaired loans with related allowance, interest income recognized (cash basis)	0		19
Impaired loan with no related allowance, interest income recognized (cash basis)	$ 2	$ 1	$ 5	$ 2

Loans and allowance for loan_13

Loans and allowance for loan losses - Financial Effect of TDRs (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)loan	Sep. 30, 2018USD ($)loan	Sep. 30, 2019USD ($)loan	Sep. 30, 2018USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of loans | loan	5	5	7	9
Pre-modification outstanding recorded investment	$ 3,507	$ 198	$ 6,695	$ 1,340
Post-modification outstanding recorded investment	3,507	198	6,695	1,340
Charge offs and specific reserves	$ 106	$ 0	$ 106	$ 0
Consumer and other
Financing Receivable, Modifications [Line Items]
Number of loans | loan		4
Pre-modification outstanding recorded investment		$ 55
Post-modification outstanding recorded investment		55
Charge offs and specific reserves		$ 0
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of loans | loan	1		3	2
Pre-modification outstanding recorded investment	$ 16		$ 3,204	$ 887
Post-modification outstanding recorded investment	16		3,204	887
Charge offs and specific reserves	$ 0		$ 0	$ 0
Construction
Financing Receivable, Modifications [Line Items]
Number of loans | loan	1		1
Pre-modification outstanding recorded investment	$ 1,070		$ 1,070
Post-modification outstanding recorded investment	1,070		1,070
Charge offs and specific reserves	$ 0		$ 0
Commercial real estate: | Owner occupied
Financing Receivable, Modifications [Line Items]
Number of loans | loan	1	1	1	1
Pre-modification outstanding recorded investment	$ 927	$ 143	$ 927	$ 143
Post-modification outstanding recorded investment	927	143	927	143
Charge offs and specific reserves	$ 0	$ 0	$ 0	$ 0
Commercial real estate: | Non-owner occupied
Financing Receivable, Modifications [Line Items]
Number of loans | loan	1		1
Pre-modification outstanding recorded investment	$ 1,366		$ 1,366
Post-modification outstanding recorded investment	1,366		1,366
Charge offs and specific reserves	$ 106		$ 106
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Modifications [Line Items]
Number of loans | loan	1		1	1
Pre-modification outstanding recorded investment	$ 128		$ 128	$ 249
Post-modification outstanding recorded investment	128		128	249
Charge offs and specific reserves	$ 0		$ 0	$ 0
Residential real estate: | Consumer and other
Financing Receivable, Modifications [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

Other real estate owned - Summa

Other real estate owned - Summary of Other Real Estate Owned (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Real Estate [Roll Forward]
Balance at beginning of period	$ 15,521	$ 14,639	$ 12,643	$ 16,442
Transfers from loans	1,535	476	3,565	1,490
Transfers from premises and equipment	0	0	2,640	0
Proceeds from sale of other real estate owned	(854)	(1,457)	(2,718)	(3,666)
Gain on sale of other real estate owned	260	205	582	213
Loans provided for sales of other real estate owned	0	(191)	(166)	(636)
Write-downs and partial liquidations	(386)	(85)	(470)	(256)
Balance at end of period	$ 16,076	$ 13,587	$ 16,076	$ 13,587

Other real estate owned - Narra

Other real estate owned - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Real Estate Properties [Line Items]
Other real estate owned included excess land and facilities held for sale	$ 7,305
Residential Real Estate Properties
Real Estate Properties [Line Items]
Foreclosed residential real estate properties	3,066	$ 2,101
Total foreclosure proceedings in process	867	478
Atlantic Capital Bank
Real Estate Properties [Line Items]
Other real estate owned included excess land and facilities held for sale	$ 891	$ 5,381

Goodwill and intangible asset_2

Goodwill and intangible assets Goodwill and intangible assets - Goodwill activity (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 137,190,000
Addition from acquisition of Atlantic Capital branches	31,396,000
Impairment due to sale of third party origination (TPO) mortgage delivery channel	(100,000)	$ 0
Goodwill, ending balance	$ 168,486,000	$ 137,190,000

Goodwill and intangible asset_3

Goodwill and intangible assets - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Impairment		$ 100,000	$ 0
Atlantic Capital Bank | Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 10,760,000
Estimated useful life of intangible assets	6 years

Goodwill and intangible asset_4

Goodwill and intangible assets - Schedule of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Finite-lived Intangible Assets [Roll Forward]
Beginning Balance			$ 11,628
Amortization of intangibles	$ (1,197)	$ (777)	(3,180)	$ (2,432)
Ending Balance	18,748		18,748
Core Deposit and Other Intangibles
Finite-lived Intangible Assets [Roll Forward]
Beginning Balance	19,945	13,203	11,628	14,902
Finite-lived intangible assets acquired	0	0	10,760	0
Reclassification of leasehold intangible	0	0	(460)	0
Amortization of intangibles	(1,197)	(800)	(3,180)	(2,499)
Ending Balance	18,748	$ 12,403	18,748	$ 12,403
Lease Agreements | Occupancy and equipment expense
Finite-lived Intangible Assets [Roll Forward]
Amortization of intangibles	$ (23)		$ (67)

Goodwill and intangible asset_5

Goodwill and intangible assets - Schedule of Estimated Aggregate Amortization Expense of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2019	$ 1,159
December 31, 2020	4,262
December 31, 2021	3,663
December 31, 2022	2,973
December 31, 2023	2,247
Thereafter	4,444
Net Carrying Amount	$ 18,748	$ 11,628

Leases (Details)

Leases (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019lease_renew_optionlease
Lessee, Lease, Description [Line Items]
Lessee, number of operating leases, noncurrent | lease			42
Lessee, operating lease, number of options to renew | lease_renew_option			1
Operating lease rent expense | $	$ 1,295	$ 3,786
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract			1 year
Lessee, operating lease, renewal term			20 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract			37 years

Leases - Operating Leases (Deta

Leases - Operating Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets	$ 34,812	$ 0
Lease liability	$ 37,760	$ 0
Weighted average remaining lease term (in years)	14 years 5 months 5 days
Weighted average discount rate	3.46%

Leases - Lease Costs (Details)

Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 1,260	$ 3,875
Short-term lease cost	81	239
Variable lease cost	146	580
Total lease cost	$ 1,487	$ 4,694

Leases - Maturity (Details)

Leases - Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Lease payments due on or before:
September 30, 2020	$ 5,537
September 30, 2021	5,244
September 30, 2022	4,523
September 30, 2023	3,996
September 30, 2024	3,578
Thereafter	26,396
Total undiscounted cash flows	49,274
Discount on cash flows	(11,514)
Lease liability	$ 37,760	$ 0

Mortgage servicing rights - Sch

Mortgage servicing rights - Schedule of Changes in Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]
Carrying value at beginning of period	$ 66,380	$ 109,449	$ 88,829	$ 76,107
Capitalization	10,387	11,741	30,319	41,555
Sales	0	(39,428)	(29,160)	(39,428)
Change in fair value:
Due to pay-offs/pay-downs	(5,050)	(3,339)	(10,150)	(8,606)
Due to change in valuation inputs or assumptions	(5,561)	1,467	(13,682)	10,262
Carrying value at period end	$ 66,156	$ 79,890	$ 66,156	$ 79,890

Mortgage servicing rights - S_2

Mortgage servicing rights - Schedule of Servicing Income and Expense Included in Mortgage Banking Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Servicing income:
Servicing income	$ 3,960	$ 5,576	$ 12,763	$ 15,973
Change in fair value of mortgage servicing rights	(10,611)	(1,872)	(23,832)	1,656
Change in fair value of derivative hedging instruments	5,520	(829)	13,060	(7,848)
Servicing income	(1,131)	2,875	1,991	9,781
Servicing expenses	1,732	2,114	4,961	5,987
Net servicing (loss) income	$ (2,863)	$ 761	$ (2,970)	$ 3,794

Mortgage servicing rights - S_3

Mortgage servicing rights - Schedule of Data and Key Economic Assumptions Related to Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Transfers and Servicing of Financial Assets [Abstract]
Unpaid principal balance	$ 6,297,723	$ 6,755,114
Weighted-average prepayment speed (CPR)	11.64%	8.58%
Estimated impact on fair value of a 10% increase	$ (2,743)	$ (2,072)
Estimated impact on fair value of a 20% increase	$ (5,278)	$ (4,006)
Discount rate	8.58%	10.45%
Estimated impact on fair value of a 100 bp increase	$ (2,568)	$ (2,505)
Estimated impact on fair value of a 200 bp increase	$ (4,946)	$ (4,807)
Weighted-average coupon interest rate	4.32%	4.21%
Weighted-average servicing fee (basis points)	0.29%	0.30%
Weighted-average remaining maturity (in months)	336 months	325 months

Mortgage servicing rights - Nar

Mortgage servicing rights - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Transfers and Servicing of Financial Assets [Abstract]
Mortgage servicing rights sold	$ 0	$ 39,428	$ 29,160	$ 39,428
Mortgage loans serviced	2,034,374	$ 3,181,483	2,034,374	$ 3,181,483
Mortgage escrow deposit	$ 121,400		$ 121,400		$ 53,468

Income taxes - Schedule of Allo

Income taxes - Schedule of Allocation of Federal and State Income Taxes between Current and Deferred Portions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Current	$ 9,167	$ 13,367	$ 25,907	$ 15,562
Deferred	(1,449)	(6,665)	(5,900)	4,416
Total	$ 7,718	$ 6,702	$ 20,007	$ 19,978

Income taxes - Schedule of Reco

Income taxes - Schedule of 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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Federal taxes calculated at statutory rate	$ 6,653	$ 5,897	$ 17,272	$ 17,467
Federal taxes calculated at statutory rate, percent	21.00%	21.00%	21.00%	21.00%
Increase (decrease) resulting from:
State taxes, net of federal benefit	$ 1,512	$ 1,187	$ 3,855	$ 3,873
Benefit of equity based compensation	(275)	(115)	(668)	(866)
Municipal interest income, net of interest disallowance	(211)	(213)	(650)	(621)
Bank owned life insurance	(11)	(13)	(38)	(38)
Stock offering costs			0	141
Other	50	(41)	236	22
Total	$ 7,718	$ 6,702	$ 20,007	$ 19,978
Effective Income Tax Rate Reconciliation, Percent [Abstract]
State taxes, net of federal benefit, percent	4.70%	4.20%	4.70%	4.60%
Benefit of equity based compensation, percent	(0.90%)	(0.40%)	(0.80%)	(1.00%)
Municipal interest income, net of interest disallowance, percent	(0.70%)	(0.80%)	(0.80%)	(0.80%)
Bank owned life insurance, percent	0.10%	(0.00%)	(0.10%)	(0.10%)
Stock offering costs, percent			0.00%	0.20%
Other, percent	0.20%	(0.10%)	0.30%	0.10%
Income tax expense, as reported	24.40%	23.90%	24.30%	24.00%

Income taxes - Schedule of Net

Income taxes - Schedule of Net Deferred Tax liability (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Deferred tax assets:
Allowance for loan losses	$ 8,198	$ 7,539
Operating lease liability	9,839	0
Amortization of core deposit intangible	1,273	1,012
Deferred compensation	5,891	5,878
Unrealized loss on available-for-sale debt securities	115	3,299
Other	2,451	1,998
Subtotal	27,767	19,726
Deferred tax liabilities:
FHLB stock dividends	(550)	(550)
Operating lease - right of use asset	(9,514)	0
Depreciation	(4,466)	(4,812)
Cash flow hedges	(3,418)	(736)
Mortgage servicing rights	(17,342)	(23,146)
Goodwill	(8,244)	(6,583)
Other	(901)	(562)
Subtotal	(44,435)	(36,389)
Net deferred tax liability	$ (16,668)	$ (16,663)

Commitments and contingencies -

Commitments and contingencies - Summary of Financial Instruments with Off-Balance Sheet Credit Risk (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Balance at end of period	$ 1,210,536	$ 1,051,414
Commitments to extend credit, excluding interest rate lock commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Balance at end of period	1,188,160	1,032,390
Letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Balance at end of period	$ 22,376	$ 19,024

Commitments and contingencies_2

Commitments and contingencies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Total principal amount of loans repurchased or indemnified	$ 1,165	$ 2,322	$ 4,675	$ 4,984

Commitments and contingencies_3

Commitments and contingencies - Summary of Allowance for Loan Repurchases or Indemnifications (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 3,407	$ 3,646	$ 3,273	$ 3,386
Provision for loan repurchases or indemnifications	107	206	255	598
Recoveries on previous losses	(79)	(115)	(93)	(247)
Balance at end of period	$ 3,435	$ 3,737	$ 3,435	$ 3,737

Derivatives - Additional Inform

Derivatives - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Jul. 31, 2017USD ($)derivative	Mar. 31, 2018USD ($)	Sep. 30, 2019USD ($)derivative	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2017USD ($)
Derivative [Line Items]
Notional Amount	$ 100,000
Stockholders' equity			$ 744,835	$ 718,759	$ 671,857	$ 648,731	$ 630,959	$ 596,729
Cash collateral pledged on derivatives			$ 34,172		13,904
Subordinated Debentures
Derivative [Line Items]
Number of derivative instruments | derivative			2
Long-term debt			$ 30,930
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		30,000
Interest rate swaps | Subordinated Debentures
Derivative [Line Items]
Notional Amount			30,000
Fair value of interest rate swap			(837)		721
Interest Rate Swaps Three
Derivative [Line Items]
Notional Amount	$ 30,000
Derivative notional amount maturity period	3 years
Interest Rate Swaps Four
Derivative [Line Items]
Notional Amount	$ 35,000
Derivative notional amount maturity period	4 years
Interest Rate Swaps Five
Derivative [Line Items]
Notional Amount	$ 35,000
Derivative notional amount maturity period	5 years
Gain on canceled derivatives		$ 1,564
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Derivative [Line Items]
Stockholders' equity			$ 1,093		$ 1,436
London Interbank Offered Rate (LIBOR) | Interest rate swaps | Subordinated Debentures
Derivative [Line Items]
Variable interest rate			2.08%

Derivatives - Schedule of Deriv

Derivatives - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Jul. 31, 2017
Derivatives, Fair Value [Line Items]
Notional Amount			$ 100,000
Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	$ 2,201,716	$ 1,258,047
Asset	29,172	13,595
Liability	19,050	11,637
Interest rate contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	427,468	295,333
Asset	19,050	6,679
Liability	19,050	6,679
Forward commitments | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	824,724	474,208
Asset	582	0
Liability	0	4,958
Interest rate-lock commitments | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	679,524	318,706
Asset	9,142	6,241
Liability	0	0
Futures contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	270,000	166,000
Asset	398	649
Liability	0	0
Option contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	0	3,800
Asset	0	26
Liability	0	0
Interest rate swaps | Designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	30,000	30,000
Asset	0	721
Liability	$ 837	$ 0

Derivatives - Schedule of Gains

Derivatives - Schedule of Gains (Losses) Included in the Consolidated Statements of Income Related to Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivatives, Fair Value [Line Items]
Reclassification adjustment for gain on hedging activities, tax	$ (46)	$ 23	$ (121)	$ 22
Amount of (loss) gain recognized in other comprehensive income, net of tax	(256)		(1,151)
Amount of (loss) gain recognized in other comprehensive income, net of tax		169		1,638
Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	1,908	(2,509)	2,017	2,360
Designated as hedging:
Derivatives, Fair Value [Line Items]
Total cash flow hedge gain (loss) and derivative excluded component increase (decrease)	149	89	456	126
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	130	69	343	62
Gain included in interest expense on borrowings	19	20	113	64
Interest rate-lock commitments | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	447	(3,415)	4,202	(688)
Forward commitments | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(3,227)	1,524	(12,895)	7,477
Futures contracts | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	4,685	(563)	10,663	(4,379)
Option contracts | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ 3	$ (55)	$ 47	$ (50)

Fair value of financial instr_3

Fair value of financial instruments - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financial assets:
Interest receivable	$ 17,729	$ 14,503
Level 1
Financial assets:
Cash and cash equivalents	242,997	125,356
Investment securities	0	0
Loans, net	0	0
Loans held for sale	0	0
Interest receivable	0	0
Mortgage servicing rights	0	0
Derivatives	0	0
Financial liabilities:
Deposits, Without stated maturities	3,725,500	3,051,972
Deposits, With stated maturities	0	0
Securities sold under agreement to repurchase and federal funds sold	26,199	15,081
Federal Home Loan Bank advances	0	0
Subordinated debt	0	0
Interest Payable	356	530
Derivatives	0	0
Level 2
Financial assets:
Cash and cash equivalents	0	0
Investment securities	671,781	658,805
Loans, net	0	0
Loans held for sale	305,493	278,815
Interest receivable	3,263	2,848
Mortgage servicing rights	0	0
Derivatives	29,172	14,316
Financial liabilities:
Deposits, Without stated maturities	0	0
Deposits, With stated maturities	1,208,205	1,122,076
Securities sold under agreement to repurchase and federal funds sold	0	0
Federal Home Loan Bank advances	251,799	181,864
Subordinated debt	29,760	30,000
Interest Payable	5,746	4,485
Derivatives	19,887	11,637
Level 3
Financial assets:
Cash and cash equivalents	0	0
Investment securities	0	0
Loans, net	4,299,499	3,630,500
Loans held for sale	0	0
Interest receivable	14,466	11,655
Mortgage servicing rights	66,156	88,829
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	0
Subordinated debt	0	0
Interest Payable	0	0
Derivatives	0	0
Carrying amount
Financial assets:
Cash and cash equivalents	242,997	125,356
Investment securities	671,781	658,805
Loans, net	4,313,880	3,638,579
Loans held for sale	305,493	278,815
Interest receivable	17,729	14,503
Mortgage servicing rights	66,156	88,829
Derivatives	29,172	14,316
Financial liabilities:
Deposits, Without stated maturities	3,725,500	3,051,972
Deposits, With stated maturities	1,196,263	1,119,745
Securities sold under agreement to repurchase and federal funds sold	26,199	15,081
Federal Home Loan Bank advances	250,000	181,765
Subordinated debt	30,930	30,930
Interest Payable	6,102	5,015
Derivatives	19,887	11,637
Fair Value
Financial assets:
Cash and cash equivalents	242,997	125,356
Investment securities	671,781	658,805
Loans, net	4,299,499	3,630,500
Loans held for sale	305,493	278,815
Interest receivable	17,729	14,503
Mortgage servicing rights	66,156	88,829
Derivatives	29,172	14,316
Financial liabilities:
Deposits, Without stated maturities	3,725,500	3,051,972
Deposits, With stated maturities	1,208,205	1,122,076
Securities sold under agreement to repurchase and federal funds sold	26,199	15,081
Federal Home Loan Bank advances	251,799	181,864
Subordinated debt	29,760	30,000
Interest Payable	6,102	5,015
Derivatives	$ 19,887	$ 11,637

Fair value of financial instr_4

Fair value of financial instruments - Balances and Levels of Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financial assets:
Available-for-sale debt securities, at fair value	$ 668,531	$ 655,698
Equity securities, at fair value	3,250	3,107
Impaired loans	18,267	13,716
Municipals, tax exempt
Financial assets:
Available-for-sale debt securities, at fair value	173,785	138,887
Treasury securities
Financial assets:
Available-for-sale debt securities, at fair value	7,432	7,242
Corporate securities
Financial assets:
Available-for-sale debt securities, at fair value	1,015
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	671,781	658,805
Loans held for sale	305,493	278,815
Mortgage servicing rights	0	0
Derivatives	29,172	14,316
Financial liabilities:
Derivatives	19,887	11,637
Significant unobservable inputs (level 3)
Financial assets:
Investment securities	0	0
Loans held for sale	0	0
Mortgage servicing rights	66,156	88,829
Derivatives	0	0
Financial liabilities:
Derivatives	0	0
Fair Value, Measurements, Recurring
Financial assets:
Equity securities, at fair value	3,250	3,107
Investment securities	671,781	658,805
Loans held for sale	305,493	278,815
Mortgage servicing rights	66,156	88,829
Derivatives	29,172	14,316
Financial liabilities:
Derivatives	19,887	11,637
Fair Value, Measurements, Recurring | U.S. government agency securities
Financial assets:
Available-for-sale debt securities, at fair value	999	989
Fair Value, Measurements, Recurring | Mortgage-backed securities
Financial assets:
Available-for-sale debt securities, at fair value	485,300	508,580
Fair Value, Measurements, Recurring | Municipals, tax exempt
Financial assets:
Available-for-sale debt securities, at fair value	173,785	138,887
Fair Value, Measurements, Recurring | Treasury securities
Financial assets:
Available-for-sale debt securities, at fair value	7,432	7,242
Fair Value, Measurements, Recurring | Corporate securities
Financial assets:
Available-for-sale debt securities, at fair value	1,015
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	0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Mortgage-backed 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) | 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) | 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
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2)
Financial assets:
Equity securities, at fair value	3,250	3,107
Investment securities	671,781	658,805
Loans held for sale	305,493	278,815
Mortgage servicing rights	0	0
Derivatives	29,172	14,316
Financial liabilities:
Derivatives	19,887	11,637
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	999	989
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2) | Mortgage-backed securities
Financial assets:
Available-for-sale debt securities, at fair value	485,300	508,580
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2) | Municipals, tax exempt
Financial assets:
Available-for-sale debt securities, at fair value	173,785	138,887
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2) | Treasury securities
Financial assets:
Available-for-sale debt securities, at fair value	7,432	7,242
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2) | Corporate securities
Financial assets:
Available-for-sale debt securities, at fair value	1,015
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	0	0
Mortgage servicing rights	66,156	88,829
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	0
Fair Value, Measurements, Recurring | Significant unobservable inputs (level 3) | Mortgage-backed securities
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) | 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
Fair Value, Measurements, Nonrecurring
Financial assets:
Other real estate owned	6,053	2,266
Impaired loans	5,815	8,718
Fair Value, Measurements, Nonrecurring | Commercial and industrial
Financial assets:
Impaired loans	3,479	732
Fair Value, Measurements, Nonrecurring | Consumer and other
Financial assets:
Impaired loans	395
Fair Value, Measurements, Nonrecurring | Construction Loans | Commercial and industrial
Financial assets:
Impaired loans		832
Fair Value, Measurements, Nonrecurring | 1-to-4 family mortgage | Residential real estate:
Financial assets:
Impaired loans	315	146
Fair Value, Measurements, Nonrecurring | Owner occupied | Commercial real estate:
Financial assets:
Impaired loans	260	87
Fair Value, Measurements, Nonrecurring | Non-owner occupied | Commercial real estate:
Financial assets:
Impaired loans		6,921
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1)
Financial assets:
Other real estate owned	0	0
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Commercial and industrial
Financial assets:
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Consumer and other
Financial assets:
Impaired loans	0
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Construction Loans | Commercial and industrial
Financial assets:
Impaired loans		0
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | 1-to-4 family mortgage | Residential real estate:
Financial assets:
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Owner occupied | Commercial real estate:
Financial assets:
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring | Quoted prices in active markets for identical assets (liabilities) (level 1) | Non-owner occupied | Commercial real estate:
Financial assets:
Impaired loans		0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2)
Financial assets:
Other real estate owned	0	0
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2) | Commercial and industrial
Financial assets:
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2) | Consumer and other
Financial assets:
Impaired loans	0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2) | Construction Loans | Commercial and industrial
Financial assets:
Impaired loans		0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2) | 1-to-4 family mortgage | Residential real estate:
Financial assets:
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2) | Owner occupied | Commercial real estate:
Financial assets:
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring | Significant other observable inputs (level 2) | Non-owner occupied | Commercial real estate:
Financial assets:
Impaired loans		0
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3)
Financial assets:
Other real estate owned	6,053	2,266
Impaired loans	5,815	8,718
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Commercial and industrial
Financial assets:
Impaired loans	3,479	732
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Consumer and other
Financial assets:
Impaired loans	395
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Construction Loans | Commercial and industrial
Financial assets:
Impaired loans		832
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | 1-to-4 family mortgage | Residential real estate:
Financial assets:
Impaired loans	315	146
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Owner occupied | Commercial real estate:
Financial assets:
Impaired loans	$ 260	87
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Non-owner occupied | Commercial real estate:
Financial assets:
Impaired loans		$ 6,921

Fair value of financial instr_5

Fair value of financial instruments - Reconciliation for Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs or Level 3 Inputs (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 0	$ 3,604
Reclassification of equity securities without a readily determinable fair value to other assets	0	(3,604)
Balance at end of period	$ 0	$ 0

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) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	$ 18,267	$ 13,716
Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	5,815	8,718
Other real estate owned	6,053	2,266
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	5,815	8,718
Other real estate owned	$ 6,053	$ 2,266
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans, measurement input	0.00%	0.00%
Other real estate owned, measurement input	0	0
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans, measurement input	30.00%	30.00%
Other real estate owned, measurement input	0.15	0.15

Fair value of financial instr_7

Fair value of financial instruments - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Mortgage Loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net (losses) gains from fair value changes of mortgage loans	$ (3,291)	$ 3,212	$ (2,329)	$ 7,409
GNMA
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Delinquent GNMA loans that had been previously sold	$ 28,897		$ 28,897		$ 67,362

Fair value of financial instr_8

Fair value of financial instruments - Schedule of Differences between Fair Value and Principal Balance for Loans Held for Sale Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	$ 305,493	$ 278,418
Past due loans of 90 days or more	0	0
Nonaccrual loans	0	397
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	297,311	267,907
Past due loans of 90 days or more	0	0
Nonaccrual loans	0	397
Difference
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	8,182	10,511
Past due loans of 90 days or more	0	0
Nonaccrual loans	$ 0	$ 0

Segment reporting - Additional

Segment reporting - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)segment	Sep. 30, 2018USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Other noninterest expense	$ 36,710	$ 30,336	$ 109,447	$ 89,984
Interest income	67,639	57,904	194,363	163,126
Mortgage Segment
Segment Reporting Information [Line Items]
Other noninterest expense	112	0	1,995	0
Interest paid	$ 2,875	$ 3,997	$ 8,723	$ 13,022
Mortgage Segment | Prime Interest Rate
Segment Reporting Information [Line Items]
Warehouse line of credit interest rate	5.00%	5.25%	5.00%	5.25%
Banking Segment
Segment Reporting Information [Line Items]
Other noninterest expense	$ 36,598	$ 30,336	$ 107,452	$ 89,984
Interest income	$ (5,848)	$ 0	$ 3,997	$ 13,022

Segment reporting - Schedule of

Segment reporting - Schedule of Segment Financial Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net interest income	$ 58,305,000	$ 52,755,000	$ 168,344,000	$ 152,701,000
Provision for loan losses	1,831,000	1,818,000	4,103,000	3,198,000
Mortgage banking income	34,284,000	29,350,000	85,512,000	87,856,000
Change in fair value of mortgage servicing rights	(5,091,000)	(2,701,000)	(10,772,000)	(6,192,000)
Other noninterest income	8,952,000	7,706,000	25,423,000	21,729,000
Depreciation and amortization	1,380,000	1,013,000	3,830,000	3,251,000
Amortization of intangibles	1,197,000	777,000	3,180,000	2,432,000
Other noninterest mortgage banking expense	23,648,000	25,087,000	65,698,000	74,055,000
Other noninterest expense	36,710,000	30,336,000	109,447,000	89,984,000
Income before income taxes	31,684,000	28,079,000	82,249,000	83,174,000
Income tax expense	7,718,000	6,702,000	20,007,000	19,978,000
Net income	23,966,000	21,377,000	62,242,000	63,196,000
Total assets	6,088,895,000	5,058,167,000	6,088,895,000	5,058,167,000	$ 5,136,764,000
Goodwill	168,486,000	137,190,000	168,486,000	137,190,000	$ 137,190,000
Merger costs	295,000	0	4,699,000	1,193,000
Impairment of goodwill			100,000	0
Banking Segment
Segment Reporting Information [Line Items]
Net interest income	58,350,000	52,733,000	168,322,000	153,173,000
Provision for loan losses	1,831,000	1,818,000	4,103,000	3,198,000
Mortgage banking income	10,693,000	7,417,000	20,530,000	20,419,000
Change in fair value of mortgage servicing rights	0	0	0	0
Other noninterest income	8,952,000	7,706,000	25,423,000	21,729,000
Depreciation and amortization	1,255,000	896,000	3,431,000	2,864,000
Amortization of intangibles	1,197,000	777,000	3,180,000	2,432,000
Other noninterest mortgage banking expense	8,087,000	6,383,000	15,090,000	17,129,000
Other noninterest expense	36,598,000	30,336,000	107,452,000	89,984,000
Income before income taxes	29,027,000	27,646,000	81,019,000	79,714,000
Total assets	5,730,492,000	4,637,097,000	5,730,492,000	4,637,097,000
Goodwill	168,486,000	137,090,000	168,486,000	137,090,000
Merger costs	295,000		4,699,000
Offering cost				671,000
Mortgage Segment
Segment Reporting Information [Line Items]
Net interest income	(45,000)	22,000	22,000	(472,000)
Provision for loan losses	0	0	0	0
Mortgage banking income	23,591,000	21,933,000	64,982,000	67,437,000
Change in fair value of mortgage servicing rights	(5,091,000)	(2,701,000)	(10,772,000)	(6,192,000)
Other noninterest income	0	0	0	0
Depreciation and amortization	125,000	117,000	399,000	387,000
Amortization of intangibles	0	0	0	0
Other noninterest mortgage banking expense	15,561,000	18,704,000	50,608,000	56,926,000
Other noninterest expense	112,000	0	1,995,000	0
Income before income taxes	2,657,000	433,000	1,230,000	3,460,000
Total assets	358,403,000	421,070,000	358,403,000	421,070,000
Goodwill	$ 0	$ 100,000	0	$ 100,000
Impairment of goodwill			$ 100,000

Minimum capital requirements -

Minimum capital requirements - Additional Information (Details)	Sep. 30, 2019	Dec. 31, 2018
Banking and Thrift [Abstract]
Capital conservative buffer percentage	2.50%	1.88%

Minimum capital requirements _2

Minimum capital requirements - Schedule of Actual and Required Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
FB Financial Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to risk-weighted assets), Actual Amount	$ 614,708	$ 582,945
Total Capital (to risk-weighted assets), Actual Ratio	12.00%	13.00%
Total Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 409,805	$ 358,735
Total Capital (to risk-weighted assets), For capital adequacy purposes, Ratio	8.00%	8.00%
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount	$ 537,870	$ 442,814
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	10.50%	9.90%
Tier 1 Capital (to risk-weighted assets), Actual Amount	$ 583,244	$ 554,013
Tier 1 Capital (to risk-weighted assets), Actual Ratio	11.30%	12.40%
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 309,687	$ 268,071
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio	6.00%	6.00%
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount	$ 438,723	$ 351,843
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	8.50%	7.90%
Tier 1 Capital (to average assets), Actual Amount	$ 583,244	$ 554,013
Tier 1 Capital (to average assets), Actual Ratio	10.10%	11.40%
Tier 1 Capital (to average assets), For capital adequacy purposes, Amount	$ 230,988	$ 194,391
Tier 1 Capital (to average assets), For capital adequacy purposes, Ratio	4.00%	4.00%
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount	$ 553,244	$ 524,013
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio	10.80%	11.70%
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 230,518	$ 201,543
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio	4.50%	4.50%
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount	$ 358,584	$ 285,520
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	7.00%	6.40%
FirstBank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to risk-weighted assets), Actual Amount	$ 601,769	$ 561,327
Total Capital (to risk-weighted assets), Actual Ratio	11.70%	12.50%
Total Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 411,466	$ 359,249
Total Capital (to risk-weighted assets), For capital adequacy purposes, Ratio	8.00%	8.00%
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount	$ 540,049	$ 443,448
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	10.50%	9.90%
Total Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Amount	$ 514,332	$ 449,062
Total Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Ratio	10.00%	10.00%
Tier 1 Capital (to risk-weighted assets), Actual Amount	$ 570,305	$ 532,395
Tier 1 Capital (to risk-weighted assets), Actual Ratio	11.10%	11.90%
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 308,273	$ 268,434
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio	6.00%	6.00%
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount	$ 436,720	$ 352,320
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	8.50%	7.90%
Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions Amount	$ 411,031	$ 357,913
Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions Ratio	8.00%	8.00%
Tier 1 Capital (to average assets), Actual Amount	$ 570,305	$ 532,395
Tier 1 Capital (to average assets), Actual Ratio	9.80%	10.90%
Tier 1 Capital (to average assets), For capital adequacy purposes, Amount	$ 232,778	$ 195,374
Tier 1 Capital (to average assets), For capital adequacy purposes, Ratio	4.00%	4.00%
Tier 1 Capital (to average assets), To be well capitalized under prompt corrective action provisions, Amount	$ 290,972	$ 244,218
Tier 1 Capital (to average assets), To be well capitalized under prompt corrective action provisions, Ratio	5.00%	5.00%
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount	$ 570,305	$ 532,395
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio	11.10%	11.90%
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 231,205	$ 201,326
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio	4.50%	4.50%
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount	$ 359,652	$ 285,212
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	7.00%	6.40%
Common Equity Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Amount	$ 333,962	$ 290,804
Common Equity Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Ratio	6.50%	6.50%

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Vested and Unvested Restricted Stock Units Outstanding (Details) - Restricted Stock Units (RSUs) - $ / shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Restricted Stock Units Outstanding, Balance, beginning of period (in shares)	1,140,215,000	1,214,325,000
Restricted Stock Units Outstanding, Grants (in shares)	167,343,000	117,459,000
Restricted Stock Units Outstanding, Released and distributed (vested) (in shares)	(270,959,000)	(205,565,000)
Restricted Stock Units Outstanding, Forfeited/expired (in shares)	(11,727,000)	(10,035,000)
Restricted Stock Units Outstanding, Balance, end of period (in shares)	1,024,872,000	1,116,184,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Grant Date Fair Value, Balance, beginning of period (USD per share)	$ 21.96	$ 19.97
Weighted Average Grant Date Fair Value, Grants (USD per share)	34.05	40.20
Weighted Average Grant Date Fair Value, Released and distributed (vested) (USD per share)	24	21.93
Weighted Average Grant Date Fair Value, Forfeited/expired (USD per share)	24.56	23.66
Weighted Average Grant Date Fair Value, Balance, end of period (USD per share)	$ 23.67	$ 21.86

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2016	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to stock grants and vesting of restricted stock units			$ 5,621	$ 5,327
Dividends declared not paid on restricted stock units	$ 168	$ 134	168	134
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock units vested and released	1,488	490	6,503	4,508
Compensation cost related to stock grants and vesting of restricted stock units	1,836	1,508	5,621	5,327
One-time expense for modification of vesting terms				249
Restricted Stock Units (RSUs) | Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to stock grants and vesting of restricted stock units	186	212	537	557
Stock-Settled EBI Units and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested stock-settled EBI units and restricted stock units	12,759	$ 12,768	$ 12,759	$ 12,768
Expected weighted-average period to be recognized			1 year 10 months 13 days	2 years 3 months 29 days
Dividends declared not paid on restricted stock units	$ 394		$ 394			$ 226
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price percentage of subsequent offering periods					95.00%
Maximum number of shares issuable (in shares)					200,000
Maximum number of shares per participant (in shares)					725
Maximum worth of award per participant					$ 25,000
Shares issued under plan (in shares)	12,558,000	12,072,000	23,171,000	28,609,000
Number of shares reserved for issuance (in shares)	2,409,185	2,432,356	2,409,185	2,432,356

Related party transactions - Sc

Related party transactions - Schedule of Loans Analysis to Executive Officers, Certain Management, Bank Directors and Their Affiliates (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Loans and Leases Receivable, Related Parties [Roll Forward]
Loans outstanding, Beginning balance	$ 32,264
New loans and advances	12,160
Change in related party status	(9,687)
Repayments	(3,458)
Loans outstanding, Ending balance	$ 31,279

Related party transactions - Ad

Related party transactions - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Deposits from related parties	$ 271,090,000		$ 271,090,000		$ 287,156,000
Aviation Time Sharing Agreement
Related Party Transaction [Line Items]
Payments to related party	46,000	$ 36,000	143,000	$ 127,000
Registration Rights Agreement, 2016
Related Party Transaction [Line Items]
Payments to related party	0		0	700,000
Certain Executive Officers, Certain Management and Directors and Their Associates
Related Party Transaction [Line Items]
Unfunded commitments	26,114,000		26,114,000		15,000,000
Director
Related Party Transaction [Line Items]
Unamortized leasehold improvements	92,000		92,000		$ 116,000
Lease expense	$ 128,000	$ 128,000	$ 381,000	$ 387,000

Uncategorized Items - fbk-20190

Label	Element	Value
AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 109,000
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 0