FB Financial (FBK) 10-K 12 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Mar. 05, 2019	Jun. 29, 2018
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Trading Symbol	FBK
Entity Registrant Name	FB Financial Corp
Entity Central Index Key	0001649749
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
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)		30,832,823
Entity Public Float			$ 686.3

Consolidated balance sheets

Consolidated balance sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 38,381	$ 29,831
Federal funds sold	31,364	66,127
Interest bearing deposits in financial institutions	55,611	23,793
Cash and cash equivalents	125,356	119,751
Investments:
Available-for-sale debt securities, at fair value	655,698	536,270
Equity securities, at fair value	3,107	7,722
Federal Home Loan Bank stock, at cost	13,432	11,412
Loans held for sale, at fair value	278,815	526,185
Loans	3,667,511	3,166,911
Less: allowance for loan losses	28,932	24,041
Net loans	3,638,579	3,142,870
Premises and equipment, net	86,882	81,577
Other real estate owned, net	12,643	16,442
Interest receivable	14,503	13,069
Mortgage servicing rights	88,829	76,107
Goodwill	137,190	137,190
Core deposit and other intangibles, net	11,628	14,902
Other assets	70,102	44,216
Total assets	5,136,764	4,727,713
Deposits
Noninterest bearing	949,135	888,200
Interest bearing checking	863,706	895,140
Money market and savings	1,239,131	1,192,726
Customer time deposits	1,016,638	602,628
Brokered and internet time deposits	103,107	85,701
Total deposits	4,171,717	3,664,395
Borrowings	227,776	347,595
Accrued expenses and other liabilities	65,414	118,994
Total liabilities	4,464,907	4,130,984
SHAREHOLDERS' EQUITY
Common stock, $1 par value per share; 75,000,000 shares authorized; 30,724,532 and 30,535,517 shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively	30,725	30,536
Additional paid-in capital	424,146	418,596
Retained earnings	221,213	147,449
Accumulated other comprehensive (loss) income, net	(4,227)	148
Total shareholders' equity	671,857	596,729
Total liabilities and shareholders' equity	$ 5,136,764	$ 4,727,713

Consolidated balance sheets (Pa

Consolidated balance sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
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)	30,724,532	30,535,517
Common stock, shares outstanding (in shares)	30,724,532	30,535,517

Consolidated statements of inco

Consolidated statements of income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income:
Interest and fees on loans	$ 221,001	$ 153,969	$ 105,865
Interest on securities
Taxable	12,397	10,084	10,646
Tax-exempt	4,047	4,006	3,372
Other	2,126	1,554	611
Total interest income	239,571	169,613	120,494
Interest expense:
Deposits	29,536	13,031	7,342
Borrowings	5,967	3,311	2,202
Total interest expense	35,503	16,342	9,544
Net interest income	204,068	153,271	110,950
Provision for loan losses	5,398	(950)	(1,479)
Net interest income after provision for loan losses	198,670	154,221	112,429
Noninterest income:
(Loss) gain from securities, net	(116)	285	4,407
(Loss) gain on sales or write-downs of other real estate owned	(99)	774	1,282
Gain (loss) from other assets	328	(664)	(103)
Other income	6,172	4,094	2,498
Total noninterest income	130,642	141,581	144,685
Noninterest expenses:
Salaries, commissions and employee benefits	136,892	130,005	113,486
Occupancy and equipment expense	13,976	13,010	12,272
Legal and professional fees	7,903	5,737	3,514
Data processing	9,100	6,488	4,181
Merger and conversion	1,594	19,034	3,268
Amortization of core deposit and other intangibles	3,185	1,995	2,132
Amortization of mortgage servicing rights	0	0	8,321
Impairment of mortgage servicing rights	0	0	4,678
Loss on sale of mortgage servicing rights	0	249	4,447
Regulatory fees and deposit insurance assessments	2,714	2,049	1,952
Advertising	13,139	12,957	10,608
Other expense	32,584	28,035	22,551
Total noninterest expense	223,458	222,317	194,790
Income before income taxes	105,854	73,485	62,324
Income tax expense (Note 13)	25,618	21,087	21,733
Net income	$ 80,236	$ 52,398	$ 40,591
Earnings per share
Basic (in dollars per share)	$ 2.60	$ 1.90	$ 2.12
Fully diluted (in dollars per share)	$ 2.55	$ 1.86	$ 2.10
Pro Forma (C Corporation basis) (unaudited) (Note 13):
Income tax expense	$ 25,618	$ 21,087	$ 22,902
Net income	$ 80,236	$ 52,398	$ 39,422
Pro Forma Earnings per share (unaudited):
Basic (in dollars per share)	$ 2.60	$ 1.90	$ 2.06
Fully diluted (in dollars per share)	$ 2.55	$ 1.86	$ 2.04
Mortgage banking income
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	$ 100,661	$ 116,933	$ 117,751
Service charges on deposit accounts
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	8,502	7,426	7,722
ATM and interchange fees
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	10,013	8,784	7,791
Investment services and trust income
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	5,181	3,949	3,337
Software license and maintenance fees
Noninterest expenses:
Software license and maintenance fees	$ 2,371	$ 2,758	$ 3,380

Consolidated statements of comp

Consolidated statements of comprehensive income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 80,236	$ 52,398	$ 40,591
Other comprehensive income (loss), net of tax:
Net change in unrealized (loss) gain in available-for-sale securities, net of taxes of $2,025, $493 and $144	(5,439)	1,162	778
Reclassification adjustment for loss (gain) on sale of securities included in net income, net of taxes of $9, $112 and $298	44	(173)	(4,109)
Net change in unrealized gain in hedging activities, net of taxes of $366, $442, and $0	1,039	685	0
Reclassification adjustment for gain on hedging activities, net of taxes of $45, $0, and $0.	(128)	0	0
Total other comprehensive (loss) income, net of tax	(4,484)	1,674	(3,331)
Comprehensive income	$ 75,752	$ 54,072	$ 37,260

Consolidated statements of co_2

Consolidated statements of comprehensive income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net change in unrealized gain (loss) in available for sale securities, tax	$ 2,025	$ 493	$ 144
Reclassification adjustment for gain on sale of securities included in net income, tax	9	112	298
Net change in unrealized gain in hedging activities, tax	366	442	0
Reclassification adjustment for gain on hedging activities, tax	$ 45	$ 0	$ 0

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, 2015	$ 236,674	$ 17,180	$ 94,544	$ 122,493	$ 2,457
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	40,591			40,591
Other comprehensive (loss) income, net of taxes	(3,331)				(3,331)
Common stock issued, net of offering costs	115,525	6,765	108,760
Conversion of cash to stock-settled awards for equity based incentive plans	2,388		2,388
Conversion of cash to stock-settled awards for deferred compensation plan	3,000		3,000
Stock based compensation expense	4,693		4,693
Restricted stock units vested and distributed, net of shares withheld	(271)	142	(413)
Shares issued under employee stock purchase program	529	21	508
Cash dividends declared	(69,300)			(69,300)
Balance at Dec. 31, 2016	330,498	24,108	213,480	93,784	(874)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Initial fair value election on mortgage servicing rights, net of taxes of $396	615			615
Net income	52,398			52,398
Other comprehensive (loss) income, net of taxes	1,674				1,674
Reclassification of the income tax effects of the Tax Cuts and Jobs Act to Retained earnings (Note 13)	0			652	(652)
Common stock issued, net of offering costs	152,721	4,807	147,914
Common stock issued in conjunction with acquisition of the Clayton Banks (See Note 2)	52,284	1,521	50,763
Stock based compensation expense	6,760	18	6,742
Restricted stock units vested and distributed, net of shares withheld	(856)	63	(919)
Shares issued under employee stock purchase program	635	19	616
Balance at Dec. 31, 2017	596,729	30,536	418,596	147,449	148
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	80,236			80,236
Other comprehensive (loss) income, net of taxes	(4,484)				(4,484)
Stock based compensation expense	7,207	17	7,190
Restricted stock units vested and distributed, net of shares withheld	(2,664)	143	(2,807)
Shares issued under employee stock purchase program	1,196	29	1,167
Cash dividends declared	(6,363)			(6,363)
Balance at Dec. 31, 2018	$ 671,857	$ 30,725	$ 424,146	$ 221,213	$ (4,227)

Consolidated statements of ch_2

Consolidated statements of changes in shareholders' equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (USD per share)	$ 0.20		$ 4.03
Initial fair value election on mortgage servicing rights, tax		$ 396

Consolidated statements of cash

Consolidated statements of cash flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 80,236	$ 52,398	$ 40,591
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation expense	4,334	4,316	3,995
Amortization of core deposit and other intangibles	3,185	1,995	2,132
Capitalization of mortgage servicing rights	(54,913)	(58,984)	(46,070)
Amortization of mortgage servicing rights	0	0	8,321
Net change in fair value of mortgage servicing rights	2,763	4,023	0
Impairment of mortgage servicing rights	0	0	4,678
Stock-based compensation expense	7,207	6,760	4,693
Provision for loan losses	5,398	(950)	(1,479)
Provision for mortgage loan repurchases	174	810	512
Accretion of yield on purchased loans	(7,608)	(5,419)	(3,538)
Accretion of discounts and amortization of premiums on securities, net	2,768	2,693	2,326
Loss (gain) from securities, net	116	(285)	(4,407)
Originations of loans held for sale	(5,958,066)	(6,331,458)	(4,671,561)
Repurchases of loans held for sale	(12,232)	0	0
Proceeds from sale of loans held for sale	6,260,532	6,408,198	4,534,837
Gain on sale and change in fair value of loans held for sale	(88,743)	(107,189)	(115,485)
Loss (gain) on sale of mortgage servicing rights	0	249	(3,406)
Net (gain) or write-downs of other real estate owned	99	(774)	(1,282)
(Gain) loss on other assets	(328)	664	103
Provision for deferred income taxes	6,359	6,458	9,257
Changes in:
Other assets and interest receivable	(22,966)	6,478	(24,730)
Accrued expenses and other liabilities	(16,107)	47,627	15,312
Net cash provided by (used in) operating activities	212,208	37,610	(245,201)
Activity in available-for-sale securities:
Sales	2,742	94,743	271,148
Maturities, prepayments and calls	73,066	83,344	104,368
Purchases	(203,844)	(81,353)	(316,384)
Net increase in loans	(491,774)	(241,379)	(127,949)
Purchases of FHLB stock	(2,020)	0	0
Proceeds from sale of mortgage servicing rights	39,428	11,686	34,118
Purchases of premises and equipment	(10,144)	(4,545)	(4,784)
Proceeds from the sale of premises and equipment	357	39	46
Proceeds from the sale of other real estate owned	4,819	5,438	6,696
Proceeds from the sale of other assets	869	0	0
Net cash paid in business combination	0	(135,141)	0
Net cash used in investing activities	(586,501)	(267,168)	(32,741)
Cash flows from financing activities:
Net increase in demand deposits	75,906	14,682	167,616
Net increase (decrease) in time deposits	431,416	(1,367)	65,472
Net (decrease) increase in borrowings	(119,819)	46,311	36,704
Share based compensation withholding obligation	(2,664)	0	0
Net proceeds from sale of common stock	1,196	153,356	116,054
Dividends paid	(6,137)	0	(69,300)
Net cash provided by financing activities	379,898	212,982	316,546
Net change in cash and cash equivalents	5,605	(16,576)	38,604
Cash and cash equivalents at beginning of the period	119,751	136,327	97,723
Cash and cash equivalents at end of the period	125,356	119,751	136,327
Supplemental cash flow information:
Interest paid	31,992	15,470	9,474
Taxes paid	24,387	22,292	1,307
Supplemental noncash disclosures:
Transfers from loans to other real estate owned	2,138	3,605	2,724
Transfers from other real estate owned to loans	1,019	256	1,548
Transfers from loans held for sale to loans	14,732	11,706	17,963
Transfers from loans to loans held for sale	11,888	0	0
Stock consideration paid in business combination	0	52,284	0
Conversion of cash-settled to stock settled compensation	0	0	5,388
Trade date payable - securities	2,120	348	0
Dividends declared not paid on restricted stock units	226	0	0
Adoption of ASU 2016-01 (See Note 1)	(109)	0	0
Fair value election of mortgage servicing rights	0	1,011	0
GNMA
Supplemental noncash disclosures:
Transfers from loans to loans held for sale	0	43,035	0
Derecognition of rebooked GNMA delinquent loans (See Note 1)	$ 43,035	$ 0	$ 0

Basis of presentation

Basis of presentation	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation: (A) Organization and Company overview: FB Financial Corporation (f/k/a First South Bancorp, Inc.) (the “Company”) is a bank holding company headquartered in Nashville, Tennessee. The Company operates through its wholly-owned subsidiary, FirstBank (the "Bank"), with 56 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. On November 14, 2018, the Bank entered into a Purchase and Assumption Agreement to purchase 11 Tennessee and three Georgia branch locations (the "Branches") from Atlantic Capital Bank, N.A., a national banking association and a wholly owned subsidiary of Atlantic Capital Bancshares, Inc., a Georgia corporation (collectively, “Atlantic Capital”), further increasing market share in existing markets and expanding the Company's footprint into new locations. See Note 2, “Mergers and acquisitions” in the notes to the consolidated financial statements for further details regarding the terms and conditions of this acquisition. The Bank is subject to competition from other financial services companies and financial institutions. The Company and the Bank are also subject to the regulations of certain federal and state agencies and undergo periodic examinations by those regulatory authorities. See "Supervision and regulation" in part 1, item 1, for more details regarding regulatory oversight. On June 28, 2016, the Company declared a 100 -for -1 stock split, increasing the number of issued and authorized shares from 171,800 to 17,180,000 and 250,000 to 25,000,000 , respectively. Additional shares issued as a result of the stock split were distributed immediately upon issuance to the sole shareholder on that date. Share and per share amounts included in the consolidated financial statements and notes thereto reflect the effect of the split for all periods presented. Additionally, in July 2016, the Company increased the authorized shares from 25,000,000 to 75,000,000 . On August 19, 2016, the Company filed a registration statement on Form S-1 with the Securities and Exchange Commission (“SEC”) which was declared effective by the SEC on September 15, 2016. The Company sold and issued 6,764,704 shares of common stock at $19 per share pursuant to that registration statement. Total proceeds received by the Company, net of offering costs, were approximately $115,525 . The proceeds were used to fund a $55,000 distribution to the majority shareholder representing undistributed earnings previously taxed to him under subchapter S, and used to repay all $10,075 aggregate principal amount of subordinated notes held by the majority shareholder, plus any accrued and unpaid interest thereon. The Company terminated its S-Corporation status and became a taxable corporate entity (“C Corporation”) on September 16, 2016 in connection with its initial public offering. Unaudited pro forma amounts for income tax expense, net income, and basic and diluted earnings per share have been presented assuming the Company’s pro forma effective tax rate of 36.75% for the year ended December 31, 2016 as if it had been a C Corporation during that full year. On May 26, 2017, the Company entered into Securities Purchase Agreements with accredited investors, pursuant to which the Company agreed to sell an aggregate of 4,806,710 shares of the Company’s common stock at a purchase price of $33.00 per share. Total proceeds received from such sale, net of placement agent and other offering costs of $5,901 , were approximately $152,721 . 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"). (B) Basis of presentation: The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America and general banking industry. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and the reported results of operations for the year then ended. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to significant changes in the near term relate to the determination of the allowance for loan losses, investment securities determination of other-than-temporary impairment (“OTTI”), the determination of fair value in business combinations, the valuation of other real estate owned, and the determination of the fair value of financial instruments, loans held for sale and mortgage servicing rights. See Note 17 for additional information regarding the determination of fair value. The consolidated financial statements include the accounts of the Company, the Bank, and its’ wholly-owned subsidiaries, FirstBank Insurance, Inc. and Investors Title Company. All significant intercompany accounts and transactions have been eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current period presentation without any impact on the reported amounts of net income or shareholders’ equity. (C) Cash flows: For purposes of reporting consolidated cash flows, cash and cash equivalents include cash on hand, amounts due from banks, federal funds sold and interest earning deposits in other financial institutions with maturities of less than 90 days at the date of purchase. These amounts are reported in the consolidated balance sheets caption “Cash and cash equivalents.” Net cash flows are reported for loans held for investment, deposits and borrowings. (D) Cash and cash equivalents: The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash and cash equivalents. (E) Investment securities: Debt securities are classified as held to maturity and carried at amortized cost when management has the positive intent and ability to hold them to maturity. Debt securities are classified as available-for-sale when they might be sold before maturity. Available-for-sale debt securities are carried at fair value, with unrealized holding gains and losses reported in other comprehensive income, net of applicable taxes. Beginning as of January 1, 2018, equity securities with readily determinable market values are carried at fair value on the balance sheet with any periodic changes in value made through adjustments to the statement of income. Equity securities without readily determinable market values are carried at cost less impairment and included in other assets on the balance sheet. Interest income includes the amortization and accretion of purchase premium and discount. Premiums and discounts on securities are amortized on the level-yield method anticipating prepayments based upon the prior three month average monthly prepayments when available. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. The Company evaluates available-for-sale securities for other-than-temporary impairment at least on a quarterly basis, and more frequently when economic or market concerns warrant such evaluation. For securities in an unrealized loss position, consideration is given to the length of time and the extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. In analyzing an issuer’s financial condition, the Company considers whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred, and the results of reviews of the issuer’s financial condition. When OTTI is determined to have occurred, the amount of the OTTI recognized in earnings depends on whether we intend to sell the security or it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis. If we intend to sell the security or it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis, the OTTI recognized in earnings is equal to the entire difference between its amortized cost basis and its fair value at the date it was determined to be OTTI. If we do not intend to sell the security and it is not more likely than not that we will be required to sell the security before recovery of its amortized cost basis, the OTTI is separated into the amount representing the credit loss and the amount related to all other factors. The amount of the total related to the credit loss is determined based on the present value of cash flows expected to be collected and is recognized as a charge to earnings. The amount of the OTTI related to other factors is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the OTTI recognized in earnings becomes the new amortized cost basis of the investment. During the years ended December 31, 2018, 2017 and 2016, the Company did not record any OTTI on the available-for-sale portfolio; however, during the year ended December 31, 2017, the Company recognized impairment of $945 on one of its equity securities without a readily determinable market value as discussed in Note 4. There were no such impairment charges taken during the years ended December 31, 2018 or 2016. (F) Federal Home Loan Bank (FHLB) stock: The Bank accounts for its investments in FHLB stock in accordance with FASB ASC Topic 942-325 "Financial Services-Depository and Lending-Investments-Other." FHLB stock are equity securities that do not have a readily determinable fair value because its ownership is restricted and lacks a market. FHLB stock is carried at cost and evaluated for impairment. (G) Loans held for sale: Loans originated and intended for sale in the secondary market, primarily mortgage loans, are carried at fair value as permitted under the guidance in ASC 825, “Financial Instruments” (“ASC 825”). Net (losses) gains of $(4,539) , $9,111 , and $(2,289) resulting from fair value changes of these mortgage loans were recorded in income during the years ended December 31, 2018 , 2017 and 2016 , respectively. The amount does not reflect changes in fair values of related derivative instruments used to hedge exposure to market-related risks associated with these mortgage loans. The change in fair value of both mortgage loans held for sale and the related derivative instruments are recorded in “Mortgage banking income” in the Consolidated Statements of Income. Gains and losses are recognized in Mortgage banking income on the consolidated statements of income at the time the loan is closed. Pass through origination costs and related loan fees are also included in “Mortgage banking income”. Effective December 31, 2017, the Company adopted a change in accounting policy to recognize revenue on Best Efforts deliveries and accrue commissions at the time of the interest rate lock commitment. Management believes this treatment better correlates and streamlines the revenue and expenses of mortgage sale delivery methods. Periodically, the Bank will transfer mortgage loans originated for sale in the secondary markets into the loan portfolio based on current market conditions, the overall secondary marketability of the loan and the status of the loan. During 2018 , 2017 , and 2016 , the Bank transferred $ 14,732 , $ 11,706 , and $ 17,963 , respectively, of residential mortgage loans into its portfolio. The loans are transferred into the portfolio at fair value at the date of transfer. On occasion, the Bank is able to restructure and sell certain of these mortgage loans previously originated to sell in the secondary market that were included in the Bank's loans held for investment portfolio. At the time of transfer, loans are marked to fair value through adjustment to the allowance for loan losses and reclassified to loans held for sale. During the year ended December 31, 2018, the Company transferred $11,888 of loans held for investment to loans held for sale, resulting in an adjustment to the allowance for loan losses of $349 . There were no such transfers during the years ended December 31, 2017 or 2016. Government National Mortgage Association (GNMA) optional repurchase programs allow financial institutions to buy back individual delinquent mortgage loans that meet certain criteria from the securitized loan pool for which the institution provides servicing and was the original transferor. At the servicer’s option and without GNMA’s prior authorization, the servicer may repurchase such a delinquent loan for an amount equal to 100 percent of the remaining principal balance of the loan. Under FASB ASC Topic 860, “Transfers and Servicing,” this buy-back option is considered a conditional option until the delinquency criteria are met, at which time the option becomes unconditional. When the Company is deemed to have regained effective control over these loans under the unconditional buy-back option, the loans can no longer be reported as sold and must be brought back onto the balance sheet as loans held for sale, regardless of whether the Company intends to exercise the buy-back option if the buyback option provides the transferor a more-than-trivial benefit. At December 31, 2018, there were $ 67,362 of delinquent GNMA loans that had previously been sold; however, the Company determined there was not 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 rebook the GNMA loans as of December 31, 2018. At December 31, 2017, rebooked GNMA loans held for sale amounted to $ 43,035 with an offsetting liability included in accrued expenses and other liabilities in the same amount. The fair value option election does not apply to the GNMA optional repurchase loans which do not meet the requirements under FASB ASC Topic 825 to be accounted for under the fair value option . (H) Loans (excluding purchased credit impaired loans): Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are stated at the principal amount outstanding less any purchase accounting discount net of any accretion recognized to date. Interest on loans is recognized as income by using the simple interest method on daily balances of the principal amount outstanding plus any accretion of purchase accounting discounts. Loans on which the accrual of interest has been discontinued are designated as nonaccrual loans. Accrual of interest is discontinued on loans past due 90 days or more unless the credit is well secured and in the process of collection. Also, a loan may be placed on nonaccrual status prior to becoming past due 90 days if management believes, after considering economic and business conditions and collection efforts, that the borrower’s financial condition is such that collection of principal or interest is doubtful. The decision to place a loan on nonaccrual status prior to becoming past due 90 days is based on an evaluation of the borrower’s financial condition, collateral liquidation value, economic and business conditions and other factors that affect the borrower’s ability to pay. When a loan is placed on nonaccrual status, the accrued but unpaid interest is charged against current period operations. Thereafter, interest on nonaccrual loans is recognized only as received if future collection of principal is probable. If the collectability of outstanding principal is doubtful, interest received is applied as a reduction of principal. A loan may be restored to accrual status when principal and interest are no longer past due or it otherwise becomes both well secured and collectability is reasonably assured. (I) Allowance for loan losses: The allowance for loan losses is a valuation allowance for probable incurred credit losses. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. Management estimates the allowance balance required using past loan loss experience, the nature and volume of the portfolio, information about specific borrower situations and estimated collateral values, economic conditions, and other factors. Allocations of the allowance may be made for specific loans, but the entire allowance is available for any loan that, in management’s judgment, should be charged off. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. Commercial and commercial real estate loans over $250 are individually evaluated for impairment. If a loan is impaired, a portion of the allowance is allocated so that the loan is reported, net, at the present value of estimated future cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected solely from the collateral. Large groups of smaller balance homogeneous loans, such as consumer, residential real estate loans, commercial and commercial real estate loans less than $250 are collectively evaluated for impairment, and accordingly, they are not separately identified for impairment disclosures. Loans for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings (“TDRs”) and classified as impaired. TDRs are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate at inception. If a TDR is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. The general component covers non-impaired loans and is based on historical loss experience adjusted for current factors. The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Company over the most recent 5 years. This actual loss experience is supplemented with other economic factors based on the risks present for each portfolio segment. These economic factors include consideration of the following: levels of and trends in delinquencies and impaired loans; levels of and trends in charge-offs and recoveries; trends in volume and terms of loans; effects of any changes in risk selection and underwriting standards; other changes in lending policies, procedures, and practices; experience, ability, and depth of lending management and other relevant staff; national and local economic trends and conditions; industry conditions; and effects of changes in credit concentrations. The following portfolio segments have been identified: Commercial and industrial loans. The Company provides a mix of variable and fixed rate commercial and industrial loans. Commercial and industrial loans are typically made to small- and medium-sized manufacturing, wholesale, retail and service businesses for working capital and operating needs and business expansions, including the purchase of capital equipment and loans made to farmers relating to their operations. This category also includes loans secured by manufactured housing receivables. Commercial and industrial loans generally include lines of credit and loans with maturities of five years or less. The loans are generally made with operating cash flows as the primary source of repayment, but may also include collateralization by inventory, accounts receivable, equipment and/or personal guarantees. The ability of the borrower to collect accounts receivable, and to turn inventory into sales are risk factors in the repayment of the loan. Construction loans. Construction loans include commercial construction, land acquisition and land development loans and single-family interim construction loans to small- and medium-sized businesses and individuals. These loans are generally secured by the land or the real property being built and are made based on our assessment of the value of the property on an as-completed basis. We expect to continue to make construction loans at a similar pace so long as demand continues and the market for and values of such properties remain stable or continue to improve in our markets. These loans can carry risk of repayment when projects incur cost overruns, have an increase in the price of building materials, encounter zoning and environmental issues, or encounter other factors that may affect the completion of a project on time and on budget. Additionally, repayment risk may be negatively impacted when the market experiences a deterioration in the value of real estate. Residential real estate 1-4 family mortgage loans . The Company’s residential real estate 1-4 family mortgage loans are primarily made with respect to and secured by single family homes, which are both owner-occupied and investor owned and include manufactured homes with real estate. The Company intends to continue to make residential 1-4 family housing loans at a similar pace, so long as housing values in our markets do not deteriorate from current prevailing levels and we are able to make such loans consistent with our current credit and underwriting standards. First lien residential 1-4 family mortgages may be affected by unemployment or underemployment and deteriorating market values of real estate. Residential line of credit loans. The Company’s residential line of credit loans are primarily revolving, open-end lines of credit secured by 1-4 residential properties. The Company intends to continue to make home equity loans if housing values in our markets do not deteriorate from current prevailing levels and we are able to make such loans consistent with our current credit and underwriting standards. Second lien residential 1-4 family mortgages may be affected by unemployment or underemployment and deteriorating market values of real estate. Multi-family residential loans. The Company’s multi-family residential loans are primarily secured by multi-family properties, such as apartments and condominium buildings. These loans also may be affected by unemployment or underemployment and deteriorating market values of real estate. Commercial real estate loans . The Company’s commercial real estate owner-occupied loans include loans to finance commercial real estate owner occupied properties for various purposes including use as offices, warehouses, production facilities, health care facilities, retail centers, restaurants, churches and agricultural based facilities. Commercial real estate owner-occupied loans are typically repaid through the ongoing business operations of the borrower, and hence are dependent on the success of the underlying business for repayment and are more exposed to general economic conditions. Commercial real estate non-owner occupied loans . The Company’s commercial real estate non-owner occupied loans include loans to finance commercial real estate non-owner occupied investment properties for various purposes including use as offices, warehouses, health care facilities, hotels, mixed-use residential/commercial, manufactured housing communities, retail centers, assisted living facilities and agricultural based facilities. Commercial real estate non-owner occupied loans are typically repaid with the funds received from the sale of the completed property or rental proceeds from such property, and are therefore more sensitive to adverse conditions in the real estate market, which can also affected by general economic conditions. Consumer and other loans . The Company’s consumer and other loans include loans to individuals for personal, family and household purposes, including car, boat and other recreational vehicle loans, manufactured homes without real estate, and personal lines of credit. Consumer loans are generally secured by vehicles and other household goods. The collateral securing consumer loans may depreciate over time. The company seeks to minimize these risks through its underwriting standards. Other loans also include loans to states and political subdivisions in the U.S. These loans are generally subject to the risk that the borrowing municipality or political subdivision may lose a significant portion of its tax base or that the project for which the loan was made may produce inadequate revenue. (J) Business combinations and accounting for acquired loans with credit deterioration: Business combinations are accounted for by applying the acquisition method in accordance with ASC 805, “Business Combinations” (“ASC 805”). Under the acquisition method, identifiable assets acquired and liabilities assumed and any non-controlling interest in the acquiree at the acquisition date are measured at their fair values as of that date. Any excess of the purchase price over fair value of net assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including any other identifiable intangible assets, exceed the purchase price, a bargain purchase gain is recognized. Results of operations of acquired entities are included in the Consolidated Statements of Income from the date of acquisition. Loans acquired in business combinations with evidence of credit deterioration since origination and for which it is probable that all contractually required payments will not be collected are considered to be credit-impaired. Purchased credit-impaired loans (“PCI” loans) are accounted for under the accounting guidance for loans and debt securities acquired with deteriorated credit quality, in accordance with ASC 310-30, “Loans and Debt Securities Acquired with Deteriorated Credit Quality” (“ASC 310-30”), and initially measured at fair value, which includes estimated future credit losses expected to be incurred over the life of the loans. Increases in expected cash flows to be collected on these loans are recognized as an adjustment of the loan’s yield over its remaining life, while decreases in expected cash flows are recognized as an impairment. As a result, related discounts are recognized subsequently through accretion based on the expected cash flow of the acquired loans or through adjustment to the allowance for loan loss for any impairment identified subsequent to acquisitions. (K) Premises and equipment: Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. Provisions for depreciation are computed principally on the straight-line method and are charged to occupancy expense over the estimated useful lives of the assets. Maintenance agreements are amortized to expense over the period of time covered by the agreement. Costs of major additions, replacements or improvements are capitalized while expenditures for maintenance and repairs are charged to expense as incurred. For financial statement purposes, the estimated useful life for premises is forty years , for furniture and fixtures the estimated useful life is seven to ten years, for leasehold improvements the estimated useful life is the lesser of twenty years or the term of the lease and for equipment the estimated useful life is three to seven years. (L) Other real estate owned: Real estate acquired through, or in lieu of, loan foreclosure is initially recorded at fair value less the estimated cost to sell at the date of foreclosure which may establish a new cost basis. Other real estate owned may also include excess facilities held for sale as described in Note 7. Physical possession of residential real estate property collateralizing a consumer mortgage loan occurs when legal title is obtained upon completion of foreclosure or when the borrower conveys all interest in the property to satisfy the loan. After initial measurement, valuations are periodically performed by management and the asset is carried at the lower of carrying amount or fair value less costs to sell. Revenue and expenses from operations are included in other noninterest income and noninterest expenses. Losses due to the valuation of the property are included in (loss) gain on sales or write-downs of other real estate owned. (M) Mortgage servicing rights: The Company retains the right to service certain mortgage loans that it sells to secondary market investors. The retained mortgage servicing right is initially recorded at the fair value of future net cash flows expected to be realized for performing servicing activities. Fair value is determined using an income approach with various assumptions including expected cash flows, prepayment speeds, market discount rates, servicing costs, and other factors. These mortgage servicing rights are recognized as a separate asset on the date the corresponding mortgage loan is sold. In periods prior to 2017, mortgage servicing rights were amortized in proportion to and over the period of estimated net servicing income. These servicing rights were carried at amortized cost less any impairment. Impairment losses on mortgage servicing rights were recognized to the extent by which the unamortized cost exceeded fair value. Impairment losses on mortgage servicing rights of $4,678 was recognized in earnings during the year ended December 31, 2016 . As of January 1, 2017, the Company elected to account for its mortgage servicing rights under the fair value option as permitted under ASC 860-50-35, Transfers and Servicing. The change in accounting policy resulted in a one-time adjustment to retained earnings of $615 for the after-tax increase in fair value above book value at the time of adoption. Subsequent changes in fair value are recorded in earnings in Mortgage banking income. (N) Transfers of financial assets: Transfers of financial assets are accounted for as sales, when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. (O) Goodwill and other intangibles: Goodwill represents the excess of the cost of an acquisition over the fair value of the net assets acquired. Goodwill impairment testing is performed annually or more frequently if events or circumstances indicate possible impairment. Goodwill is assigned to the Company’s reporting units, Banking or Mortgage as applicable. See Note 2, “Mergers and acquisitions” for information related to the goodwill recorded in the Bank’s acquisitions of Clayton Bank and Trust and American City Bank. Goodwill is evaluated for impairment by either performing a qualitative evaluation or a two -step quantitative test. The qualitative evaluation is an assessment of factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount, including goodwill. If an entity does a qualitative assessment and determines that it is not more likely than

Mergers and acquisitions

Mergers and acquisitions	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Mergers and acquisitions	Mergers and acquisitions: Atlantic Capital Bank branch acquisition On November 14, 2018, the Bank entered into a Purchase and Assumption Agreement (the "Purchase Agreement") to purchase 11 Tennessee and three Georgia branch locations (the "Branches") from Atlantic Capital Bank, N.A., a national banking association and a wholly owned subsidiary of Atlantic Capital Bancshares, Inc., a Georgia corporation (collectively, “Atlantic Capital”). On the terms and subject to conditions set forth in the Purchase Agreement, FirstBank has committed to assume approximately $602,000 in deposits, purchase approximately $381,000 in loans at 99.32% of book value, and pay a deposit premium of 6.25% based on the lower of the actual deposit balance at close or on the average closing deposit balance for the 30 days prior to close. Upon consumation, the Branches will become FirstBank branches. As such, the Atlantic Capital branch acquistion will be accounted for under ASC 805, "Business Combinations." The Company incurred $401 in merger-related expenses during the year ended December 31, 2018 in connection with this transaction. The acquisition is expected to be completed in the second quarter of 2019. As of the date of this annual report, all regulatory approvals have been received. Clayton Bank and Trust and American City Bank On July 31, 2017, FirstBank merged with Clayton Bank and Trust (“CBT”) and American City Bank (“ACB” and together with CBT, the “Clayton Banks”), pursuant to the Stock Purchase Agreement by and among the Company, FirstBank, the Clayton Banks, Clayton HC, Inc., a Tennessee corporation and its majority shareholder, James L. Clayton, dated February 8, 2017 , as amended on May 26, 2017, with a purchase price of $236,484 . The Company issued 1,521,200 shares of common stock and paid cash of $184,200 to purchase all of the outstanding shares of the Clayton Banks. At closing, the Clayton Banks merged with and into FirstBank, with FirstBank continuing as the surviving banking entity. Prior to the merger, the Clayton Banks operated 18 banking locations across Tennessee. The merger with the Clayton Banks has allowed the Company to further its strategic initiatives by expanding its geographic footprint in Knoxville and other Tennessee markets and accelerates the growth of the Company’s Banking segment. Goodwill of $90,323 recorded in connection with the transaction resulted primarily from anticipated synergies arising from the combination of certain operational areas of the Clayton Banks and the Company as well as the purchase premium inherent to buying a complete and successful banking operation. Goodwill is included in the Banking segment as substantially all of the operations resulting from the Clayton Banks merger is included in the Banking segment. In connection with the transaction, the Company incurred $1,193 and $ 19,034 in merger and conversion expenses during the years ended December 31, 2018 and 2017, respectively. For income tax purposes, the merger with the Clayton Banks was treated as an asset purchase. As an asset purchase for income tax purposes, the value of assets and liabilities for the Clayton Banks are the same for both financial reporting and income tax purposes; therefore, no deferred taxes were recorded at the date of acquisition. Additionally, this treatment allows for the deductibility of the goodwill and core deposit intangible for income tax purposes over 15 years. The Company accounted for the Clayton Banks transaction under the acquisition method under ASC Topic 805. Accordingly, the fair value of the assets acquired and liabilities assumed along with the resulting goodwill was recorded as of the date of the merger. The Company’s operating results include the operating results of the acquired assets and assumed liabilities of the Clayton Banks subsequent to the acquisition date. As of December 31, 2017 , the Company finalized its valuation of all assets acquired and liabilities assumed, resulting in no material changes to preliminary purchase accounting adjustments. The following tables present the final estimated fair value of net assets acquired as of the July 31, 2017 acquisition date and the consideration paid and an allocation of the purchase price to net assets acquired: As of July 31, 2017 As Recorded by FB Financial Corporation (1) Assets Cash and cash equivalents $ 49,059 Investment securities 59,493 FHLB stock 3,409 Loans 1,059,728 Allowance for loan losses — Premises and equipment 18,866 Other real estate owned 6,888 Intangibles, net 12,334 Other assets 5,978 Total assets $ 1,215,755 Liabilities Interest-bearing deposits $ 670,054 Noninterest-bearing deposits 309,464 Borrowings 84,831 Accrued expenses and other liabilities 5,245 Total liabilities 1,069,594 Net assets acquired $ 146,161 Purchase price: Equity consideration Common stock issued 1,521,200 Price per share as of July 31, 2017 $ 34.37 Total equity consideration $ 52,284 Cash consideration 184,200 (2) Total consideration paid $ 236,484 Preliminary allocation of consideration paid: Fair value of net assets acquired including identifiable intangible assets $ 146,161 Goodwill 90,323 Total consideration paid $ 236,484 (1) Amounts include certain reclassifications of opening balances to conform to the Company’s presentation. (2) Amount was deposited into an interest-bearing deposit account with the Bank in the name of the Seller as of July, 31, 2017. The following unaudited pro forma condensed consolidated financial information presents the results of operations for the years ended December 31, 2017 and 2016 as though the merger had been completed as of January 1, 2016. The unaudited estimated pro forma information combines the historical results of the Clayton Banks with the Company’s historical consolidated results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments including loan discount accretion, amortization of core deposit and other intangibles, and amortization of the discount on time deposits for the periods presented. The pro forma information is not indicative of what would have occurred had the acquisition taken place on January 1, 2016 and does not reflect any assumptions regarding cost-savings, revenue enhancements, provision for credit losses or asset dispositions. Actual revenues and earnings of the Clayton Banks since the merger date have not been disclosed as it is not practicable as the Clayton Banks were merged into the Company and separate financial information is not readily available. Year Ended December 31, 2017 2016 Net interest income $ 192,633 $ 171,383 Total revenues $ 336,404 $ 322,045 Net income $ 75,659 $ 64,608

Cash and cash equivalents conce

Cash and cash equivalents concentrations	12 Months Ended
	Dec. 31, 2018
Risks and Uncertainties [Abstract]
Cash and cash equivalents concentrations	Cash and cash equivalents concentrations: The Bank is required to maintain an average reserve balance with the Federal Reserve Bank or maintain such reserve balance in the form of cash. The required balance at December 31, 2018 was $ 10,184 . The Bank maintains its cash in bank deposit accounts, which, at times, may exceed federally insured limits. The Bank has not experienced any losses in such correspondent accounts and believes it is not exposed to any significant credit risk from cash and cash equivalents. The Bank had cash in the form of Federal funds sold included in cash and cash equivalents of $ 31,364 and $ 66,127 as of December 31, 2018 and 2017, respectively.

Investment securities

Investment securities	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investment securities	Investment securities: The amortized cost of securities and their fair values at December 31, 2018 and 2017 are shown below: 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 December 31, 2018, the Company also had $ 3,107 in marketable equity securities recorded at fair value. Net losses of $ 81 were recognized due to changes in fair value of these securities during the year ended December 31, 2018. As of January 1, 2018, the Company adopted ASU 2016-01 (See Note 1) and reclassified $3,604 of other securities without readily determinable market values to other assets. December 31, 2017 Amortized cost Gross unrealized gains Gross unrealized losses Fair Value Investment Securities Available-for-sale debt securities U.S. government agency securities $ 999 $ — $ (13 ) $ 986 Mortgage-backed securities - residential 425,557 374 (7,150 ) 418,781 Municipals, tax exempt 107,127 2,692 (568 ) 109,251 Treasury securities 7,345 — (93 ) 7,252 Total debt securities 541,028 3,066 (7,824 ) 536,270 Equity securities 7,870 1 (149 ) 7,722 Total securities available-for-sale $ 548,898 $ 3,067 $ (7,973 ) $ 543,992 Securities pledged at December 31, 2018 and 2017 had carrying amounts of $ 326,215 and $ 337,604 , 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 at December 31, 2018 and 2017. Included in available-for-sale securities at December 31, 2018 and 2017 were $ 2,120 and $ 348 , respectively, in trade date payables that were settled after year end. The amortized cost and fair value of debt securities by contractual maturity at December 31, 2018 and 2017 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. Year Ended December 31, 2018 2017 Available-for-sale Available-for-sale Amortized cost Fair value Amortized cost Fair value Due in one year or less $ 15,883 $ 16,028 $ 905 $ 925 Due in one to five years 13,806 13,740 28,332 28,878 Due in five to ten years 18,539 18,387 19,218 19,588 Due in over ten years 99,151 98,963 67,016 68,098 147,379 147,118 115,471 117,489 Mortgage-backed securities - residential 520,654 508,580 425,557 418,781 Total debt securities $ 668,033 $ 655,698 $ 541,028 $ 536,270 Sales of available-for-sale securities were as follows: Year Ended December 31, 2018 2017 2016 Proceeds from sales $ 2,742 $ 94,743 $ 271,148 Gross realized gains 8 1,277 4,755 Gross realized losses 44 48 348 The Company also recognized $ 1 and $ 1 on gains related to the early call of available for sale securities during the years ended December 31, 2018 and December 31, 2017, respectively. The following tables show gross unrealized losses at December 31, 2018 and 2017 , aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position: 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 debt securities $ 87,858 $ (844 ) $ 369,343 $ (14,247 ) $ 457,201 $ (15,091 ) December 31, 2017 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 $ — $ — $ 986 $ (13 ) $ 986 $ (13 ) Mortgage-backed securities - residential 107,611 (980 ) 290,258 (6,170 ) 397,869 (7,150 ) Municipals, tax exempt 7,354 (101 ) 20,112 (467 ) 27,466 (568 ) Treasury securities 7,252 (93 ) — — 7,252 (93 ) Total debt securities 122,217 (1,174 ) 311,356 (6,650 ) 433,573 (7,824 ) Equity securities — — 3,050 (149 ) 3,050 (149 ) $ 122,217 $ (1,174 ) $ 314,406 $ (6,799 ) $ 436,623 $ (7,973 ) As of December 31, 2018 and 2017 , the Company’s securities portfolio consisted of 360 and 294 securities, 174 and 124 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 year ended December 31, 2018. During the year ended December 31, 2017, the Company recognized impairment of $945 on one of the equity securities without readily determinable market value. On January 1, 2018, this investment was reclassified to other assets. 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 bases, which may be maturity.

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Loans and allowance for loan losses	Loans and allowance for loan losses: Loans outstanding at December 31, 2018 and 2017 , by major lending classification are as follows: December 31, 2018 2017 Commercial and industrial $ 867,083 $ 715,075 Construction 556,051 448,326 Residential real estate: 1-to-4 family mortgage 555,815 480,989 Residential line of credit 190,480 194,986 Multi-family mortgage 75,457 62,374 Commercial real estate: Owner occupied 493,524 495,872 Non-owner occupied 700,248 551,588 Consumer and other 228,853 217,701 Gross loans 3,667,511 3,166,911 Less: Allowance for loan losses (28,932 ) (24,041 ) Net loans $ 3,638,579 $ 3,142,870 As of December 31, 2018 and 2017 , $ 618,976 and $ 761,197 , respectively, of qualifying residential mortgage loans (including loans held for sale) and $ 608,735 and $ 207,370 , respectively, of qualifying commercial mortgage loans were pledged to the Federal Home Loan Bank of Cincinnati securing advances against the Bank’s line. As of December 31, 2018 and 2017 , $ 1,336,092 and $ 737,856 , respectively, of qualifying loans were pledged to the Federal Reserve Bank under the Borrower-in-Custody program. As of December 31, 2018 and 2017 , 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 $ 68,999 and $ 88,835 , respectively. The following table presents changes in the value of the accretable yield for PCI loans for the periods indicated. Year Ended 2018 2017 2016 Balance at the beginning of period $ (17,682 ) $ (2,444 ) $ (1,637 ) Additions through the acquisition of the Clayton Banks — (18,868 ) — Principal reductions and other reclassifications from nonaccretable difference (4,047 ) (1,841 ) (3,438 ) Recoveries — (23 ) — Accretion 9,010 5,299 2,631 Changes in expected cash flows (3,868 ) 195 — Balance at end of period $ (16,587 ) $ (17,682 ) $ (2,444 ) Included in the ending balance of the accretable yield on PCI loans in the table above at December 31, 2018, is a purchase accounting liquidity discount of $ 2,436 . There is also a purchase accounting nonaccretable credit discount of $4,355 related to the PCI loan portfolio at December 31, 2018 and an accretable credit and liquidity discount on non-PCI loans of $ 7,527 and $ 2,197 , respectively. 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 amounting to $ 9,010 , $ 5,299 and $ 2,631 was recognized on purchased credit impaired loans during the years ended December 31, 2018 , 2017 and 2016 , respectively. This includes both the contractual interest income recognized and the purchase accounting contribution through accretion of the liquidity discount and credit mark for changes in estimated cash flows. The total purchase accounting contribution through accretion excluding contractual interest collected for all purchased loans was $ 7,608 , $ 5,419 and $ 3,538 for the years ended December 31, 2018 , 2017 and 2016 , respectively. The following provides the allowance for loan losses by portfolio segment and the related investment in loans net of unearned interest for the years December 31, 2018 , 2017 and 2016 : Commercial and industrial Construction 1-to-4 family residential mortgage Residential line of credit Multi- family residential mortgage Commercial real estate owner occupied Commercial real estate non-owner occupied Consumer and other Total Year Ended December 31, 2018 Beginning balance - December 31, 2017 $ 4,461 $ 7,135 $ 3,197 $ 944 $ 434 $ 3,558 $ 2,817 $ 1,495 $ 24,041 Provision for loan losses 1,395 1,459 547 (275 ) 132 (478 ) 1,281 1,337 5,398 Recoveries of loans previously charged-off 390 1,164 171 178 — 143 51 550 2,647 Loans charged off (898 ) (29 ) (138 ) (36 ) — (91 ) — (1,613 ) (2,805 ) Adjustments for transfers to loans HFS — — (349 ) — — — — — (349 ) Ending balance - December 31, 2018 $ 5,348 $ 9,729 $ 3,428 $ 811 $ 566 $ 3,132 $ 4,149 $ 1,769 $ 28,932 Commercial and industrial Construction 1-to-4 family residential mortgage Residential line of credit Multi- family residential mortgage Commercial real estate owner occupied Commercial real estate non-owner occupied Consumer and other Total Year Ended December 31, 2017 Beginning balance - December 31, 2016 $ 5,309 $ 4,940 $ 3,197 $ 1,613 $ 504 $ 3,302 $ 2,019 $ 863 $ 21,747 Provision for loan losses (2,158 ) 1,138 41 (788 ) (70 ) 483 (848 ) 1,252 (950 ) Recoveries of loans previously charged-off 1,894 1,084 159 395 — 61 1,646 532 5,771 Loans charged off (584 ) (27 ) (200 ) (276 ) — (288 ) — (1,152 ) (2,527 ) Ending balance - December 31, 2017 $ 4,461 $ 7,135 $ 3,197 $ 944 $ 434 $ 3,558 $ 2,817 $ 1,495 $ 24,041 Commercial and industrial Construction 1-to-4 family residential mortgage Residential line of credit Multi- family residential mortgage Commercial real estate owner occupied Commercial real estate non-owner occupied Consumer and other Total Year Ended December 31, 2016 Beginning balance - December 31, 2015 $ 5,135 $ 5,143 $ 4,176 $ 2,201 $ 311 $ 3,682 $ 2,622 $ 1,190 $ 24,460 Provision for loan losses 212 (417 ) (882 ) (630 ) 193 (271 ) (271 ) 587 (1,479 ) Recoveries of loans previously charged-off 524 216 127 174 — 140 195 240 1,616 Loans charged off (562 ) (2 ) (224 ) (132 ) — (249 ) (527 ) (1,154 ) (2,850 ) Ending balance - December 31, 2016 $ 5,309 $ 4,940 $ 3,197 $ 1,613 $ 504 $ 3,302 $ 2,019 $ 863 $ 21,747 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 December 31, 2018 , 2017 and 2016 : 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 December 31, 2017 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 $ 20 $ — $ 18 $ — $ — $ 120 $ 33 $ — $ 191 Collectively evaluated for impairment 4,441 7,135 3,179 944 434 3,438 2,784 1,495 23,850 Acquired with deteriorated credit quality — — — — — — — — — Ending balance - December 31, 2017 $ 4,461 $ 7,135 $ 3,197 $ 944 $ 434 $ 3,558 $ 2,817 $ 1,495 $ 24,041 December 31, 2016 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 $ 135 $ — $ 23 $ — $ — $ 113 $ 242 $ — $ 513 Collectively evaluated for impairment 5,174 4,940 3,174 1,613 504 3,189 1,777 863 21,234 Acquired with deteriorated credit quality — — — — — — — — — Ending balance - December 31, 2016 $ 5,309 $ 4,940 $ 3,197 $ 1,613 $ 504 $ 3,302 $ 2,019 $ 863 $ 21,747 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 December 31, 2018 , 2017 and 2016 : 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 December 31, 2017 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 $ 1,579 $ 1,289 $ 1,262 $ — $ 978 $ 2,520 $ 1,720 $ 25 $ 9,373 Collectively evaluated for impairment 711,352 439,309 456,229 194,986 61,376 481,390 531,704 192,357 3,068,703 Acquired with deteriorated credit quality 2,144 7,728 23,498 — 20 11,962 18,164 25,319 88,835 Ending balance - December 31, 2017 $ 715,075 $ 448,326 $ 480,989 $ 194,986 $ 62,374 $ 495,872 $ 551,588 $ 217,701 $ 3,166,911 December 31, 2016 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 $ 1,476 $ 2,686 $ 2,471 $ 311 $ 1,027 $ 2,752 $ 2,201 $ 27 $ 12,951 Collectively evaluated for impairment 384,279 238,900 290,346 176,879 43,922 350,812 260,361 74,276 1,819,775 Acquired with deteriorated credit quality 478 4,319 2,107 — 28 3,782 5,340 4 16,058 Ending balance - December 31, 2016 $ 386,233 $ 245,905 $ 294,924 $ 177,190 $ 44,977 $ 357,346 $ 267,902 $ 74,307 $ 1,848,784 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 December 31, 2018 and 2017 : 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 December 31, 2017 Pass Watch Substandard Total Loans, excluding purchased credit impaired loans Commercial and industrial $ 657,595 $ 50,946 $ 4,390 $ 712,931 Construction 431,242 7,388 1,968 440,598 Residential real estate: 1-to-4 family mortgage 440,202 9,522 7,767 457,491 Residential line of credit 192,427 1,184 1,375 194,986 Multi-family mortgage 61,234 142 978 62,354 Commercial real estate: Owner occupied 451,140 28,308 4,462 483,910 Non-owner occupied 517,253 14,199 1,972 533,424 Consumer and other 189,081 2,712 589 192,382 Total loans, excluding purchased credit impaired loans $ 2,940,174 $ 114,401 $ 23,501 $ 3,078,076 Purchased credit impaired loans Commercial and industrial $ — $ 1,499 $ 645 $ 2,144 Construction — 3,324 4,404 7,728 Residential real estate: 1-to-4 family mortgage — 20,284 3,214 23,498 Residential line of credit — — — — Multi-family mortgage — — 20 20 Commercial real estate: Owner occupied — 4,631 7,331 11,962 Non-owner occupied — 7,359 10,805 18,164 Consumer and other — 19,751 5,568 25,319 Total purchased credit impaired loans $ — $ 56,848 $ 31,987 $ 88,835 Total loans $ 2,940,174 $ 171,249 $ 55,488 $ 3,166,911 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. The accrual 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 December 31, 2018 or December 31, 2017 as the carrying value of the respective loan or pool of loans cash flows were considered estimable and probable of collection. 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 December 31, 2018 and 2017 : December 31, 2018 30-89 days past due 90 days or more and accruing interest Non-accrual loans Loans current on payments and accruing interest Purchased Credit Impaired loans Total Commercial and industrial $ 999 $ 65 $ 6,124 $ 858,447 $ 1,448 $ 867,083 Construction 109 — 283 549,904 5,755 556,051 Residential real estate: 1-to-4 family mortgage 4,919 737 2,704 528,078 19,377 555,815 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 2,423 484,481 6,016 493,524 Non-owner occupied 61 77 1,199 682,645 16,266 700,248 Consumer and other 1,987 1,008 148 205,573 20,137 228,853 Total $ 9,208 $ 3,041 $ 13,685 $ 3,572,578 $ 68,999 $ 3,667,511 December 31, 2017 30-89 days past due 90 days or more and accruing interest Non-accrual loans Loans current on payments and accruing interest Purchased Credit Impaired loans Total Commercial and industrial $ 5,859 $ 90 $ 533 $ 706,449 $ 2,144 $ 715,075 Construction 1,412 241 300 438,645 7,728 448,326 Residential real estate: 1-to-4 family mortgage 4,678 956 2,548 449,309 23,498 480,989 Residential line of credit 527 134 699 193,626 — 194,986 Multi-family mortgage — — — 62,354 20 62,374 Commercial real estate: Owner occupied 521 358 2,582 480,449 11,962 495,872 Non-owner occupied 121 — 1,371 531,932 18,164 551,588 Consumer and other 1,945 217 68 190,152 25,319 217,701 Total $ 15,063 $ 1,996 $ 8,101 $ 3,052,916 $ 88,835 $ 3,166,911 Impaired loans recognized in conformity with ASC 310 at December 31, 2018 and 2017 , segregated by class, were as follows: December 31, 2018 Recorded investment Unpaid principal Related allowance With a related allowance recorded: Commercial and industrial $ 618 $ 732 $ 3 Construction — — — Residential real estate: 1-to-4 family mortgage 145 145 7 Residential line of credit — — — Multi-family mortgage — — — Commercial real estate: Owner occupied 560 641 53 Non-owner occupied 5,686 5,686 205 Consumer and other — — — 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 — Multi-family mortgage — — — 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 December 31, 2017 Recorded investment Unpaid principal Related allowance With a related allowance recorded: Commercial and industrial $ 53 $ 53 $ 20 Construction — — — Residential real estate: 1-to-4 family mortgage 194 495 18 Residential line of credit — — — Multi-family mortgage — — — Commercial real estate: Owner occupied 844 1,123 120 Non-owner occupied 144 150 33 Consumer and other — — — Total $ 1,235 $ 1,821 $ 191 With no related allowance recorded: Commercial and industrial $ 1,526 $ 1,570 $ — Construction 1,289 1,313 — Residential real estate: 1-to-4 family mortgage 1,068 1,072 — Residential line of credit — — — Multi-family mortgage 978 978 — Commercial real estate: Owner occupied 1,676 2,168 — Non-owner occupied 1,576 2,325 — Consumer and other 25 25 — Total $ 8,138 $ 9,451 $ — Total impaired loans $ 9,373 $ 11,272 $ 191 December 31, 2018 2017 2016 Average recorded investment Interest income recognized (cash basis) Average recorded investment Interest income recognized (cash basis) Average recorded investment Interest income recognized (cash basis) With a related allowance recorded: Commercial and industrial $ 335 $ 121 $ 454 $ 2 $ 994 $ 17 Construction — — — — 154 — Residential real estate: 1-to-4 family mortgage 170 9 149 9 1,750 1 Residential line of credit — — — — — — Multi-family mortgage — — — — — — Commercial real estate: Owner occupied 702 43 740 48 1,756 25 Non-owner occupied 2,915 2 648 5 1,777 — Consumer and other — — 1 — 1 — Total $ 4,122 $ 175 $ 1,992 $ 64 $ 6,432 $ 43 With no related allowance recorded Commercial and industrial $ 1,377 $ 70 $ 1,074 $ 38 $ 494 $ 20 Construction 1,255 74 1,988 46 2,622 132 Residential real estate: 1-to-4 family mortgage 955 74 1,718 63 1,329 137 Residential line of credit 123 15 156 — 156 10 Multi-family mortgage 489 26 1,003 46 1,051 37 Commercial real estate: Owner occupied 1,862 148 1,897 122 1,120 119 Non-owner occupied 1,313 7 1,313 19 1,050 — Consumer and other 49 4 26 1 13 — Total $ 7,423 $ 418 $ 9,175 $ 335 $ 7,835 $ 455 Total impaired loans $ 11,545 $ 593 $ 11,167 $ 399 $ 14,267 $ 498 As of December 31, 2018 and 2017 , the Company has a recorded investment in troubled debt restructurings of $6,794 and $ 8,604 , 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 $63 and $ 172 of specific reserves for those loans at December 31, 2018 and 2017 , respectively, and has committed to lend additional amounts totaling up to $0 and $ 2 , respectively to these customers. Of these loans, $2,703 and $ 3,205 were classified as non-accrual loans as of December 31, 2018 and 2017 , respectively. The following tables present the financial effect of TDRs recorded during the periods indicated: Year Ended December 31, 2018 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial and industrial 2 $ 887 $ 887 $ — Commercial real estate: Owner occupied 1 143 143 — Residential real estate: 1-to-4 family mortgage 1 249 249 — Consumer and other 5 61 61 — Total 9 $ 1,340 $ 1,340 $ — Year Ended December 31, 2017 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial and industrial 2 $ 627 $ 627 $ — Commercial real estate: Owner occupied 1 377 377 — Non-owner occupied 2 711 711 68 Residential real estate: 1-4 family mortgage 1 143 143 8 Consumer and other 1 25 25 — Total 7 $ 1,883 $ 1,883 $ 76 Year Ended December 31, 2016 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial real estate: Owner occupied 1 $ 118 $ 118 — Residential real estate: 1-4 family mortgage 5 1,819 1,819 — Consumer and other 3 29 29 — Total 9 $ 1,966 $ 1,966 $ — There were no loans modified as troubled debt restructurings for which there was a payment default within twelve months following the modification during the years ended December 31, 2018 , 2017 and 2016. 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 years ended December 31, 2018 , 2017 and 2016 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.

Premises and equipment

Premises and equipment	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Premises and equipment	Premises and equipment: Premises and equipment and related accumulated depreciation as of December 31, 2018 and 2017 , are as follows: 2018 2017 Land $ 25,821 $ 22,108 Premises 60,995 57,719 Furniture and fixtures 23,220 22,292 Leasehold improvements 11,819 10,740 Equipment 13,774 12,525 Construction in process 869 1,496 136,498 126,880 Less: accumulated depreciation (49,616 ) (45,303 ) Total Premises and Equipment $ 86,882 $ 81,577 Depreciation expense was $ 4,334 , $4,316 and $3,995 for the years ended December 31, 2018 , 2017 and 2016 , respectively.

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2018
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 years ended December 31, 2018 , 2017 and 2016 : Year Ended 2018 2017 2016 Balance at beginning of period $ 16,442 $ 7,403 $ 11,641 Transfers from loans 2,138 3,605 2,724 Transfers from premises and equipment — 3,466 — Acquired through merger or acquisition — 6,888 — Properties sold (4,819 ) (5,438 ) (6,696 ) Gain on sale of other real estate owned 271 1,080 1,670 Transferred to loans (1,019 ) (256 ) (1,548 ) Write-downs and partial liquidations (370 ) (306 ) (388 ) Balance at end of period $ 12,643 $ 16,442 $ 7,403 Foreclosed residential real estate properties included in the table above totaled $2,101 and $3,631 as of December 31, 2018 and 2017 , respectively. The recorded investment in residential mortgage loans secured by residential real estate properties for which foreclosure proceedings are in process totaled $478 and $19 at December 31, 2018 and 2017 , respectively. During the year ended December 31, 2017, the Company acquired $6,888 in other real estate owned through the merger with Clayton Banks, including $4,147 in excess land and facilities held for sale. During the fourth quarter of 2017, the Company consolidated an additional five branch locations and transferred an additional $3,466 of excess land and facilities into other real estate owned as held for sale. At December 31, 2018 and 2017, other real estate owned included excess land and facilities held for sale amounting to $ 5,381 and $5,895 , respectively.

Goodwill and intangible assets

Goodwill and intangible assets	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and intangible assets	Goodwill and intangible assets: The balance in goodwill at December 31, 2018 and 2017 was $ 137,190 and $ 137,190 , respectively. 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 was neither indicated nor recorded during the year ended December 31, 2018 or the year ended December 31, 2017 . On July 31, 2017, the Company recorded $9,060 of core deposit intangibles resulting from the merger with the Clayton Banks, which is being amortized over a weighted average life of approximately 3 years . Additionally, the Company recognized identifiable intangible assets related to favorable lease terms of $587 , customer base trust intangible of $1,600 , and manufactured housing loan servicing intangible of $1,088 as a result of the Clayton Banks acquisition, which are being amortized over estimated lives of 6.5 years , 10 years , and 5 years respectively. Core deposit and other intangibles are as follows as of the indicated dates: Core deposit and other intangibles Gross Carrying Amount Accumulated Amortization Net Carrying Amount December 31, 2018 Core deposit intangible $ 38,915 $ (29,901 ) $ 9,014 Leasehold intangible 587 (127 ) 460 Customer base trust intangible 1,600 (227 ) 1,373 Manufactured housing servicing intangible 1,088 (307 ) 781 Total core deposit and other intangibles $ 42,190 $ (30,562 ) $ 11,628 December 31, 2017 Core deposit intangible $ 38,915 $ (27,121 ) $ 11,794 Leasehold intangible 587 (38 ) 549 Customer base trust intangible 1,600 (67 ) 1,533 Manufactured housing servicing intangible 1,088 (62 ) 1,026 Total core deposit and other intangibles $ 42,190 $ (27,288 ) $ 14,902 Amortization expense for core deposit and other intangibles for the years ended December 31, 2018, 2017 and 2016 was $ 3,185 , $ 1,995 , and $ 2,132 , respectively. The estimated aggregate amortization expense of core deposit and other intangibles for each of the next five years and thereafter is as follows: December 31, 2019 $ 2,862 December 31, 2020 2,476 December 31, 2021 2,090 December 31, 2022 1,614 December 31, 2023 1,101 Thereafter 1,485 $ 11,628

Mortgage servicing rights

Mortgage servicing rights	12 Months Ended
	Dec. 31, 2018
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 years ended December 31, 2018 , 2017 and 2016 : Year Ended December 31, 2018 2017 2016 Carrying value prior to policy change $ 76,107 $ 32,070 $ 29,711 Fair value impact of change in accounting policy (See Note 1) — 1,011 — Carrying value at beginning of period 76,107 33,081 29,711 Capitalization 54,913 58,984 46,070 Amortization — — (8,321 ) Sales (39,428 ) (11,686 ) (34,118 ) (Loss) gain on sale — (249 ) 3,406 Impairment — — (4,678 ) Change in fair value: Due to pay-offs/pay-downs (11,062 ) (3,104 ) — Due to change in valuation inputs or assumptions 8,299 (919 ) — Carrying value at December 31 $ 88,829 $ 76,107 $ 32,070 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 years ended December 31, 2018 , 2017 and 2016 , respectively: Year Ended December 31, 2018 2017 2016 Servicing income: Servicing income $ 20,591 $ 13,168 $ 12,063 Change in fair value of mortgage servicing rights (2,763 ) (4,023 ) — Change in fair value of derivative hedging instruments (5,910 ) 599 — Total servicing income 11,918 9,744 12,063 Servicing expenses: Servicing asset amortization — — 8,321 Servicing asset impairment — — 4,678 Loss on sale of mortgage servicing rights, related hedges and transaction costs on sale — 249 4,447 Other servicing expenses 7,675 4,896 2,325 Total servicing expenses 7,675 5,145 19,771 Net servicing income (loss) $ 4,243 $ 4,599 $ (7,708 ) Data and key economic assumptions related to the Company’s mortgage servicing rights as of December 31, 2018 and 2017 are as follows: As of December 31, 2018 2017 Unpaid principal balance $ 6,755,114 $ 6,529,431 Weighted-average prepayment speed (CPR) 8.58 % 8.90 % Estimated impact on fair value of a 10% increase (2,072 ) (3,026 ) Estimated impact on fair value of a 20% increase (4,006 ) (5,855 ) Discount rate 10.45 % 9.75 % Estimated impact on fair value of a 100 bp increase (2,505 ) (3,052 ) Estimated impact on fair value of a 200 bp increase (4,807 ) (5,867 ) Weighted-average coupon interest rate 4.21 % 3.94 % Weighted-average servicing fee (basis points) 30 28 Weighted-average remaining maturity (in months) 325 335 During the second quarter of 2017, the Company began hedging the mortgage servicing rights portfolio with various derivative instruments to offset changes in the fair value of the related mortgage servicing rights. As of December 31, 2018 , the MSR asset was fully hedged with respect to changes in the underlying interest rates (see Note 16). From time to time, the Company enters agreements to sell certain tranches of mortgage servicing rights. Upon consummation of the sale, occasionally the Company continues to subservice the underlying mortgage loans until they can be transferred to the purchaser. During the years ended December 31, 2018 , 2017 and 2016 , the Company sold $39,428 , $11,686 , and $34,118 of mortgage servicing rights on $3,181,483 , $1,086,465 and $3,370,395 of serviced mortgage loans, respectively. There was not a material gain or loss recognized during the year ended December 31, 2018 in connection with the sale. As of December 31, 2018 and 2017 , there were no loans being serviced that related to bulk sale of mortgage servicing rights. As of December 31, 2018, mortgage escrow deposits amounts to $ 53,468 . During the fourth quarter of 2018, the Company entered into a letter of intent for the sale of certain mortgage servicing rights on approximately $2,061,175 of serviced mortgage loans. The transaction closed subsequent to the year ended December 31, 2018 during the first quarter of 2019, resulting in the reduction of $ 29,416 in mortgage servicing rights. The Company is currently subservicing the loans until they can be transferred to the purchaser in 2019. No significant gain or loss is was recognized related to this transaction.

Other assets and other liabilit

Other assets and other liabilities	12 Months Ended
	Dec. 31, 2018
Other Assets And Other Liabilities [Abstract]
Other assets and other liabilities	Other assets and other liabilities: Included in other assets are: As of December 31, Other assets 2018 2017 Cash surrender value on bank owned life insurance $ 11,115 $ 10,873 Prepaid expenses 3,283 2,477 Software 1,313 1,962 Mortgage lending receivable 3,876 3,703 Derivatives (See Note 16) 14,316 9,690 FHLB lender risk account receivable (See Note 1) 5,225 — Other assets 30,974 15,511 Total other assets $ 70,102 $ 44,216 Included in other liabilities are: As of December 31, Other liabilities 2018 2017 Deferred compensation $ 3,836 $ 5,301 Accrued payroll 8,026 11,018 Mortgage servicing escrows 4,441 3,341 Mortgage buyback reserve 3,273 3,386 Accrued interest 5,015 1,504 Derivatives (See Note 16) 11,637 1,699 Deferred tax liability (See Note 13) 16,663 11,858 Right to repurchase GNMA loans serviced (See Note 1) — 43,035 FHLB lender risk account guaranty 2,646 — Other liabilities 9,877 37,852 Total other liabilities $ 65,414 $ 118,994

Deposits

Deposits	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
Deposits	Deposits: The aggregate amount of time deposits with a minimum denomination greater than $250 was $353,134 and $176,837 at December 31, 2018 and 2017 , respectively. At December 31, 2018 , the scheduled maturities of time deposits are as follows: Scheduled maturities of time deposits Due on or before: December 31, 2019 $ 755,870 December 31, 2020 220,751 December 31, 2021 60,928 December 31, 2022 16,887 December 31, 2023 64,811 Thereafter 498 Total $ 1,119,745 At December 31, 2018 and 2017 , the Company had $2,738 and $1,640 , respectively, of deposit accounts in overdraft status and thus have been reclassified to loans on the accompanying consolidated balance sheets.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Borrowings	Borrowings: Borrowings include securities sold under agreements to repurchase, lines of credit, Federal Home Loans Bank advances, and subordinated debt. Securities sold under agreements to repurchase and federal funds purchased Securities sold under agreements to repurchase are financing arrangements that mature daily. Securities sold under agreements to repurchase are secured by mortgage-backed securities with a carrying amount of $ 15,081 and $ 14,293 at December 31, 2018 and 2017 , respectively. Information concerning securities sold under agreements to repurchase is summarized as follows: 2018 2017 Balance at year end $ 15,081 $ 14,293 Average daily balance during the year 16,128 16,326 Average interest rate during the year 0.28 % 0.17 % Maximum month-end balance during the year 19,651 19,432 Weighted average interest rate at year-end 0.74 % 0.16 % The Bank maintains lines with certain correspondent banks that provide borrowing capacity in the form of federal funds purchased in the aggregate amount of $ 240,000 , of which there were no borrowings against as of December 31, 2018. Federal Home Loan Bank Advances As a member of the FHLB Cincinnati, the Bank receives advances from the FHLB pursuant to the terms of various agreements that assist in funding its mortgage and loan portfolio production. Under these agreements, the Company pledged qualifying loans of $ 1,227,711 as collateral securing a line with a total line of credit with a total borrowing capacity of $ 736,962 as of December 31, 2018. As of December 31, 2017, the Company pledged qualifying loans of $ 968,567 as collateral securing a line of credit with a total borrowing capacity of $ 671,461 . In 2018, a letter of credit with the FHLB of $100,000 was pledged at December 31, 2018 to secure public funds that required collateral. Additionally, during 2018 a line of $ 800,000 has been secured with the FHLB for overnight borrowing; however, additional collateral may be needed to draw on the line. Borrowings against our line totaled $ 181,765 and $ 302,372 as of December 31, 2018 and December 31, 2017, respectively. Total borrowings as of December 31, 2018 comprised $ 1,765 in long term advances, $ 80,000 in overnight cash management advances (CMAs) and $100,000 in 90 day fixed rate advances borrowed during 2017 as part of a funding strategy for the Clayton Banks merger. During 2017, the Company also entered into three corresponding interest rate swaps to hedge interest rate exposure which mature in 2020, 2021, and 2022 in increments of $30,000 , $35,000 , and $35,000 , respectively. For more information about our derivative financial instruments, see Note 16, “Derivatives.” Total borrowings as of December 31, 2017 comprised $ 12,372 in long term advances, $ 190,000 in CMAs and $100,000 in 90 day fixed rate advances. FHLB advances includes both fixed and floating rates ranging from 2.43% to 7.78% at December 31, 2018 . The weighted average interest rate on outstanding advances at December 31, 2018 was 1.93% . Maturities of FHLB advances as of December 31, 2018 are as follows: FHLB advances Due on or before: December 31, 2019 $ 180,060 December 31, December 31, 2020 59 December 31, December 31, 2021 283 December 31, December 31, 2022 692 December 31, December 31, 2023 124 Due thereafter 547 Total $ 181,765 The Company maintained a line with the Federal Reserve Bank through the Borrower-in-Custody program in 2018 and 2017. As of December 31, 2018 and 2017 , $ 1,336,092 and $ 737,856 of qualifying loans and $ 8,569 and $13,544 of investment securities were pledged to the Federal Reserve Bank through the Borrower-in-Custody program securing a line of credit of $ 934,745 and $ 529,547 , respectively. Subordinated Debt In 2003, two separate trusts formed by the Company issued $9,000 of floating rate trust preferred securities (“Trust I”) and $21,000 of floating rate trust preferred securities (“Trust II”), respectively, as part of a pooled offering of such securities. The Company issued junior subordinated debentures of $9,280 , which included proceeds of common securities purchased by the Company of $280 , and junior subordinated debentures of $21,650 , which included proceeds of common securities of $650 . Both issuances were to the trusts in exchange for the proceeds of the securities offerings, which represent the sole asset of the trusts. Trust I pays interest quarterly based upon the 3-month LIBOR plus 3.25% . Trust II pays interest quarterly based upon the 3-month LIBOR plus 3.15% . Rates for the two issues at December 31, 2018 , were 5.65% and 5.97% , respectively. Rates for the two issues at December 31, 2017 , were 4.59% and 4.82% , respectively. The Company may redeem the first junior subordinated debenture listed, in whole or in part, on any distribution payment date within 120 days of the occurrence of a special event, at the redemption price. The Company may redeem the second junior subordinated debentures listed, in whole or in part, any time after June 26, 2008, on any distribution payment date, at the redemption price. The junior subordinated debentures must be redeemed no later than 2033. The Company has classified $30,000 of subordinated debt described in the above paragraph as Tier 1 capital. The Federal Reserve Board issued guidance in March 2005 providing more strict quantitative limits on the amount of securities, similar to the junior subordinated debentures issued or assumed by the Company, that are includable in Tier 1 capital. The new guidance, which became effective in March 2009, did not impact the amount of debentures the Company includes in Tier 1 capital. Furthermore, the provisions of the Dodd-Frank Wall Street Reform and Consumer Protection Act have no effect on the treatment of this subordinated debt as Tier 1 capital while the Company remains below $15,000,000 in assets.

Income taxes

Income taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income taxes	Income taxes: Allocation of federal and state income taxes between current and deferred portions is as follows: For the year ended December 31, 2018 2017 2016 Current $ 19,259 $ 14,629 $ 12,476 Deferred 6,359 6,458 9,257 Total $ 25,618 $ 21,087 $ 21,733 Federal income tax expense differs from the statutory federal rates of 21% for the year ended December 31, 2018 and 35% for the years ended December 31, 2017 and 2016 due to the following: For the year ended December 31, 2018 2017 2016 Federal taxes calculated at statutory rate $ 22,230 21.0 % $ 25,720 35.0 % $ 5,061 8.1 % Increase (decrease) resulting from: State taxes, net of federal benefit 4,666 4.4 % 3,053 4.2 % 3,664 5.9 % Revaluation of net deferred tax liability as a result of the Tax Cuts and Jobs Act — — % (5,894 ) (8.0 )% — — % Conversion as of September 16, 2016 to C Corporation — — % — — % 13,181 21.1 % Benefit of equity based compensation (870 ) (0.8 )% (310 ) (0.4 )% (786 ) (1.3 )% Municipal interest income, net of interest disallowance (837 ) (0.8 )% (1,402 ) (1.9 )% (633 ) (1.0 )% Bank owned life insurance (51 ) — % (85 ) (0.2 )% (24 ) — % Stock offering costs 141 0.1 % — — % — — % Other 339 0.3 % 5 — % 1,270 2.1 % Income tax expense, as reported $ 25,618 24.2 % $ 21,087 28.7 % $ 21,733 34.9 % The components of the net deferred tax liability at December 31, 2018 and 2017 , are as follows: December 31, 2018 2017 Deferred tax assets: Allowance for loan losses $ 7,539 $ 6,264 Amortization of core deposit intangible 1,012 759 Deferred compensation 5,878 6,158 Unrealized loss on available-for-sale debt securities 3,299 988 Other 1,998 3,599 Subtotal 19,726 17,768 Deferred tax liabilities: FHLB stock dividends (550 ) (550 ) Depreciation (4,812 ) (4,115 ) Cash flow hedges (736 ) — Mortgage servicing rights (23,146 ) (19,830 ) Other (7,145 ) (5,131 ) Subtotal (36,389 ) (29,626 ) Net deferred tax liability $ (16,663 ) $ (11,858 ) On December 22, 2017, the Tax Cuts and Jobs Act (the “Act”) was signed into law, among other things permanently reduced the corporate tax rate from 35 percent to 21 percent , effective for tax years beginning January 1, 2018. Under the guidance of ASC 740, “Income Taxes” (“ASC 740”), the Company revalued its net deferred tax assets on the date of enactment based on the reduction in the overall future tax benefit expected to be realized at the lower tax rate implemented by the new legislation. After reviewing the Company’s inventory of deferred tax assets and liabilities on the date of enactment and giving consideration to the future impact of the lower corporate tax rates and other provisions of the new legislation, the Company’s revaluation of its net deferred tax liabilities resulted in a $5,894 reduction, which was included in “income taxes” in the Consolidated Statements of Income. In connection with the initial public offering, as discussed in Note 1, the Company terminated its S-corporation status and became a taxable entity (“C corporation”) on September 16, 2016. The reported income tax expense for the year ended December 31, 2016 reflects the increase in the deferred tax net liability of $13,181 from the conversion in the taxable status. The deferred tax net liability is the result of timing differences in the recognition of income/deductions for generally accepted accounting principles (“GAAP”) and tax purposes. The consolidated statements of income present unaudited pro forma statements of income for the year ended December 31, 2016. Additionally, in recording the impact of the conversion to a C corporation, the Company recorded a deferred income tax expense of $2,955 related to the unrealized gain on available for sale securities through the income statement in accordance with ASC 740-20-45-8; therefore, the amount shown in other comprehensive income has not been reduced by the above expense. This difference will remain in OCI until the underlying securities are sold or mature in accordance with the portfolio approach allowed under ASC 740. 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.

Dividend restrictions

Dividend restrictions	12 Months Ended
	Dec. 31, 2018
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Dividend restrictions	Dividend restrictions: Due to regulations of the Tennessee Department of Financial Institutions (“TDFI”), the Bank may not declare dividends in any calendar year that exceeds the total of its net income of that year combined with its retained net income of the preceding two years without the prior approval of the TDFI Commissioner. Based upon this regulation, $ 164,859 and $ 105,453 was available for payment of dividends without such prior approval at December 31, 2018 and 2017 , respectively. In addition, dividends paid by the Bank to the Company would be prohibited if the effect thereof would cause the Bank’s capital to be reduced below applicable minimum capital requirements. No cash dividends were declared from the Bank to the Company during the years ended December 31, 2018 or 2017.

Commitments and contingencies

Commitments and contingencies	12 Months Ended
	Dec. 31, 2018
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. December 31, 2018 2017 Commitments to extend credit, excluding interest rate lock commitments $ 1,032,390 $ 977,276 Letters of credit 19,024 22,882 Balance at end of period $ 1,051,414 $ 1,000,158 Commitments under non-cancelable operating leases were as follows, before considering renewal options that generally are present: 2019 $ 4,328 2020 3,780 2021 3,548 2022 2,542 2023 1,613 Thereafter 6,250 Total $ 22,061 Rent expense for the years ended December 31, 2018 , 2017 and 2016 , was $4,940 , $4,245 and $3,904 , respectively. 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 $6,646 and $4,704 and $8,326 for the years ended December 31, 2018 , 2017 and 2016 , respectively. The Company has established a reserve associated with loan repurchases. This reserve is recorded in accrued expenses and other liabilities on the consolidated balance sheets. The following table summarizes the activity in the repurchase reserve: For the year ended 2018 2017 2016 Balance at beginning of period $ 3,386 $ 2,659 $ 2,156 Provision for loan repurchases or indemnifications 174 810 512 Recoveries on previous losses 3 — 9 Losses on loans repurchased or indemnified (290 ) (83 ) (18 ) Balance at end of period $ 3,273 $ 3,386 $ 2,659

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2018
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 forty-five 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. In June of 2017, the Company entered into two interest rate swap agreements with notional amounts totaling $30,000 to hedge interest rate exposure on outstanding subordinate debentures included in long-term debt totaling $30,930 . See Note 12 “Borrowings” in the notes to the consolidated financial statements for additional details regarding subordinated debentures. Under these agreements, the Company receives a variable rate of interest and pays a fixed rate of interest. The interest rate swap contracts, which mature in June of 2024 , are designated as cash flow hedges with the objective of reducing the variability in cash flows resulting from changes in interest rates. As of December 31, 2018 and 2017 , the fair value of these contracts was $721 and $305 , respectively. In July of 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 are 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. Under these contracts, the Company receives a variable rate of interest and pays a fixed rate of interest. As of December 31, 2017 , the fair value of these contracts was $1,127 . 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 December 31, 2018 , there was $1,436 remaining in the other comprehensive income to be accreted into income. Certain financial instruments, including derivatives, may be eligible for offset in the Consolidated Balance Sheet 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 December 31, 2018 the Company had minimum collateral posting thresholds with certain of its derivative counterparties and had collateral posted of $13,904 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: 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 — Option contracts 3,800 26 — Total $ 1,258,047 $ 13,595 $ 11,637 December 31, 2017 Notional Amount Asset Liability Not designated as hedging: Interest rate contracts $ 146,754 $ 1,146 $ 1,146 Forward commitments 870,574 — 553 Interest rate-lock commitments 504,156 6,768 — Futures contracts 283,000 315 — Options contracts 6,000 29 — Total $ 1,810,484 $ 8,258 $ 1,699 December 31, 2018 Notional Amount Asset Liability Designated as hedging: Interest rate swaps $ 30,000 $ 721 $ — Total $ 30,000 $ 721 $ — December 31, 2017 Notional Amount Asset Liability Designated as hedging: Interest rate swaps $ 130,000 $ 1,432 — Total $ 130,000 $ 1,432 — Gains (losses) included in the Consolidated Statements of Income related to the Company’s derivative financial instruments were as follows: Year Ended December 31, 2018 2017 2016 Not designated as hedging instruments (included in mortgage banking income): Interest rate lock commitments $ (527 ) $ 340 $ 835 Forward commitments 3,864 (11,987 ) 10,497 Futures contracts (2,981 ) 315 — Option contracts (58 ) 22 — Total $ 298 $ (11,310 ) $ 11,332 Year Ended December 31, 2018 2017 2016 Designated as hedging: Amount of gain reclassified from other comprehensive income and recognized in interest expense on borrowings $ 128 $ — $ — Gain (loss) included in interest expense on borrowings 32 (168 ) — Included in loss on sale of mortgage servicing rights — — (5,569 ) Total $ 160 $ (168 ) $ (5,569 ) 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: Year Ended December 31, 2018 2017 2016 Designated as hedging: Amount of gain recognized in other comprehensive income, net of tax $ 1,039 $ 685 $ —

Fair value of financial instrum

Fair value of financial instruments	12 Months Ended
	Dec. 31, 2018
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: During the first quarter of 2018, the Company adopted ASU 2016-01, “Recognition and Measurement of Financial Assets and Liabilities.” The amendments included within this standard, which are applied prospectively, require the Company to disclose fair value of financial instruments measured at amortized cost on the balance sheet to measure the fair value using an exit price notion. Prior to adopting the amendments included in the standard, the Company measured fair value under an entry price notion. 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-Other real estate owned (“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-Servicing rights 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. Due to the adoption of ASU 2016-01 as of January 1, 2018, the fair value as presented below is measured using the exit price notion in the periods after adoption and may not be comparable with prior periods presented as a result of the change in methodology. 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 Fair Value December 31, 2017 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 119,751 $ 119,751 $ — $ — $ 119,751 Investment securities 543,992 — 540,388 3,604 543,992 Federal Home Loan Bank Stock 11,412 N/A N/A N/A N/A Loans, net 3,142,870 — 3,064,373 77,027 3,141,400 Loans held for sale 526,185 — 526,185 — 526,185 Interest receivable 13,069 — 13,069 — 13,069 Mortgage servicing rights 76,107 — — 76,107 76,107 Derivatives 9,690 — 9,690 — 9,690 Financial liabilities: Deposits: Without stated maturities $ 2,976,066 $ 2,976,066 $ — $ — $ 2,976,066 With stated maturities 688,329 — 682,403 — 682,403 Securities sold under agreement to 14,293 14,293 — — 14,293 Federal Home Loan Bank advances 302,372 190,000 112,465 — 302,465 Subordinated debt 30,930 — 36,670 — 36,670 Interest payable 1,504 575 929 — 1,504 Derivatives 1,699 — 1,699 — 1,699 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: 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 PCI loans. The balances and levels of the assets measured at fair value on a recurring basis at December 31, 2017 are presented in the following table: At December 31, 2017 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 $ — $ 986 $ — $ 986 Mortgage-backed securities — 418,781 — 418,781 Municipals, tax-exempt — 109,251 — 109,251 Treasury securities — 7,252 — 7,252 Equity securities — 4,118 3,604 7,722 Total $ — $ 540,388 $ 3,604 $ 543,992 Loans held for sale — 526,185 — 526,185 Mortgage servicing rights — — 76,107 76,107 Derivatives — 9,690 — 9,690 Financial Liabilities: Derivatives — 1,699 — 1,699 The balances and levels of the assets measured at fair value on a non-recurring basis at December 31, 2017 are presented in the following table: At December 31, 2017 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 $ — $ — $ 13,174 $ 13,174 Impaired Loans (1) : Commercial and industrial — — 1,971 1,971 Construction — — 4,211 4,211 Residential real estate: 1-4 family mortgage — — 21,902 21,902 Commercial real estate: Owner occupied — — 10,030 10,030 Non-owner occupied — — 13,593 13,593 Consumer and other — — 25,320 25,320 Total $ — $ — $ 77,027 $ 77,027 (1) Includes both impaired non-purchased loans and 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 year ended December 31, 2018 and 2017 : Available-for-sale securities Year Ended December 31, 2018 2017 Balance at beginning of period $ 3,604 $ 4,549 Reclassification of equity securities without a readily determinable fair value to other assets (1) (3,604 ) — Impairment of equity securities — (945 ) Balance at end of period $ — $ 3,604 (1) See Note 1, "Basis of Presentation" in the Notes to the consolidated financial statements for additional details regarding the adoption of ASU 2016-01, Recognition and Measurement of Financial Assets and Liabilities. As of December 31, 2017, there was no established market for certain other securities, and as such, the Company had estimated that historical costs approximated market value. As of January 1, 2018, the Company adopted ASU 2016-01 (See Note 1) and reclassified $3,604 of these other securities without readily determinable market values to other assets. An impairment of an equity security without a readily determinable fair value was considered to be other-than-temporary and was written down to its fair value resulting in an impairment loss of $945 during the year ended December 31, 2017. 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 PCI loans. The following table presents information as of December 31, 2017 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) $ 77,027 Valuation of collateral Discount for comparable sales 0%-30% Other real estate owned $ 13,174 Appraised value of property less costs to sell Discount for costs to sell 0%-15% (1) Includes both impaired non-purchased loans and 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) gains of $ (4,539) and $ 9,111 resulting from fair value changes of the mortgage loans were recorded in income during the year ended December 31, 2018 and 2017 , 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. The fair value option election does not apply to the GNMA optional repurchase loans recorded as of December 31, 2017 which do not meet the requirements under FASB ASC Topic 825 to be accounted for under the fair value option. At December 31, 2018, there were $ 67,362 of delinquent GNMA loans that had previously been sold. 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 had $ 0 in rebooked GNMA loans included in loans held for sale as of December 31, 2018. GNMA optional repurchase loans totaled $ 43,035 at December 31, 2017 and are included in loans held for sale on the accompanying Consolidated Balance Sheet. See Note 1, “Basis of presentation” in the Notes to the consolidated financial statements for additional details regarding rebooked GNMA loans. The Company’s valuation of loans held for sale incorporates an assumption for credit risk; however, given the short-term period that the Company holds these loans, valuation adjustments attributable to instrument-specific credit risk is nominal. Interest income on loans held for sale measured at fair value is accrued as it is earned based on contractual rates and is reflected in loan interest income in the Consolidated Statements of Income. The following table summarizes the differences between the fair value and the principal balance for loans held for sale measured at fair value as of December 31, 2018 and 2017 : December 31, 2018 Aggregate fair value Aggregate Unpaid Principal Balance Difference 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 — December 31, 2017 Mortgage loans held for sale measured at fair value $ 482,089 $ 467,039 $ 15,050 Past due loans of 90 days or more 320 320 — Nonaccrual loans 741 741 —

Parent company only financial s

Parent company only financial statements	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Parent company only financial statements	Parent company only financial statements: As of December 31, Balance sheet 2018 2017 Assets Cash and cash equivalents (1) $ 17,400 $ 25,789 Investments — 1,129 Investments in Bank subsidiary (1) 679,097 595,625 Other assets 7,364 5,411 Goodwill 29 29 Total assets 703,890 627,983 Liabilities and shareholders' equity Liabilities Borrowings $ 30,930 $ 30,930 Accrued expenses and other liabilities 1,103 324 Total liabilities 32,033 31,254 Shareholders' equity Common stock 30,725 30,536 Additional paid-in capital 424,146 418,596 Retained earnings 221,213 147,449 Accumulated other comprehensive (loss) income (4,227 ) 148 Total shareholders' equity 671,857 596,729 Total liabilities and shareholders' equity $ 703,890 $ 627,983 (1) Eliminates in Consolidation For the years ended For the Year Ended December 31, Income Statements 2018 2017 2016 Income Other interest income $ — $ 41 $ 33 Interest income from Bank subsidiary (1) — — 95 (Loss) gain on investments — (945 ) 417 Gain on sale of other assets 297 — — Dividend income from Bank subsidiary (1) — — 14,875 Earnings from Bank subsidiary (1) 83,285 54,713 26,859 Total income 83,582 53,809 42,279 Expenses Interest expense 1,651 1,491 1,393 Salaries, legal and professional fees 1,481 893 315 Other noninterest expense 960 296 168 Federal and state income tax benefit (746 ) (1,269 ) (188 ) Total expenses 3,346 1,411 1,688 Net income $ 80,236 $ 52,398 $ 40,591 (1) Eliminates in Consolidation For the years ended For the Year Ended December 31, Statement of Cash Flows 2018 2017 2016 Operating Activities Net income $ 80,236 $ 52,398 $ 40,591 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed income of subsidiary bank (83,285 ) (54,713 ) (26,859 ) Loss (gain) on investments — 945 (417 ) Gain on sale of other assets (297 ) Stock-based compensation expense 7,207 — 4,693 Increase in other assets (441 ) (2,439 ) (427 ) Increase (decrease) in other liabilities (7,737 ) (551 ) (5,251 ) Other, net — — 7 Net cash provided by operating activities (4,317 ) (4,360 ) 12,337 Investing Activities Proceeds from sale of other assets 869 — — Other investments — — 724 Net cash provided by investing activities 869 — 724 Financing Activities Equity contribution to Bank — (154,200 ) (20,000 ) Payment of dividends (6,137 ) — (69,300 ) Payment of borrowings — — (10,075 ) Net proceeds from sale of common stock 1,196 153,356 116,054 Net cash (used in) provided by financing activities (4,941 ) (844 ) 16,679 Net (decrease) increase in cash and cash equivalents (8,389 ) (5,204 ) 29,740 Cash and cash equivalents at beginning of year 25,789 30,993 1,253 Cash and cash equivalents at end of year $ 17,400 $ 25,789 $ 30,993 Supplemental noncash disclosures: Dividends declared not paid on restricted stock units $ (226 ) $ — $ — Noncash dividend from Bank 572 — — Conversion of cash-settled to stock-settled compensation — — 5,388 Forgiveness of intercompany debt — — 6,024

Segment reporting

Segment reporting	12 Months Ended
	Dec. 31, 2018
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 as well as internet and correspondent delivery channels. 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 year ended December 31, 2016, the Company realigned its segment reporting structure to reclassify mortgage banking income and related expenses associated with retail mortgage originations within our Banking geographic footprint from the Mortgage segment to the Banking segment. This change was made to capture all of the product and service offerings for our Banking customer base within our banking geographic footprint into the Banking segment while capturing all of the mortgage banking activities outside of the banking footprint into the Mortgage segment to allow our CEO to better determine resource allocations and operating performance for each segment. The following tables provides segment financial information for the years ended December 31, 2018 , 2017 and 2016 as follows: Year Ended December 31, 2018 Banking Mortgage Consolidated Net interest income $ 204,517 $ (449 ) $ 204,068 Provision for loan loss 5,398 — 5,398 Mortgage banking income 25,460 83,874 109,334 Change in fair value of mortgage servicing rights (1) — (8,673 ) (8,673 ) Other noninterest income 29,981 — 29,981 Depreciation 3,827 507 4,334 Amortization of intangibles 3,185 — 3,185 Other noninterest mortgage banking expense 21,671 73,068 94,739 Other noninterest expense (2) 121,200 — 121,200 Income before income taxes 104,677 1,177 105,854 Income tax expense 25,618 Net income 80,236 Total assets $ 4,752,111 $ 384,653 $ 5,136,764 Goodwill 137,090 100 137,190 (1) Included in mortgage banking income. (2) Included $1,594 in merger and conversion expenses. Year Ended December 31, 2017 Banking Mortgage Consolidated Net interest income $ 153,018 $ 253 $ 153,271 Provision for loan loss (950 ) — (950 ) Mortgage banking income 26,737 93,620 120,357 Change in fair value of mortgage servicing rights (1) — (3,424 ) (3,424 ) Other noninterest income 24,648 — 24,648 Depreciation and amortization 3,801 515 4,316 Amortization of intangibles 1,995 — 1,995 Loss on sale of mortgage servicing rights — 249 249 Other noninterest mortgage banking expense 21,714 76,582 98,296 Other noninterest expense (2) 117,461 — 117,461 Income before income taxes 60,382 13,103 73,485 Income tax expense 21,087 Net income 52,398 Total assets $ 4,130,349 $ 597,364 $ 4,727,713 Goodwill 137,090 100 137,190 (1) Included in mortgage banking income. (2) Included $19,034 in merger and conversion expenses. Year Ended December 31, 2016 Banking Mortgage Consolidated Net interest income $ 112,365 $ (1,415 ) $ 110,950 Provision for loan loss (1,479 ) — (1,479 ) Mortgage banking income 25,542 92,209 117,751 Other noninterest income 26,934 — 26,934 Depreciation and amortization 3,506 489 3,995 Amortization of intangibles 2,132 — 2,132 Amortization and impairment of mortgage servicing rights — 12,999 12,999 Loss on sale of mortgage servicing rights — 4,447 4,447 Other noninterest mortgage banking expense 16,095 66,256 82,351 Other noninterest expense (1) 88,866 — 88,866 Income before income taxes 55,721 6,603 62,324 Income tax expense 21,733 Net income 40,591 Total assets $ 2,752,773 $ 524,108 $ 3,276,881 Goodwill 46,767 100 46,867 (1) Included $3,268 in merger and conversion expenses. 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 eliminated in consolidation, had a prime interest rate of 5.5% , 4.5% and 3.75% as of December 31, 2018 , 2017 and 2016 , 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 $16,057 , $16,932 and $12,636 for the December 31, 2018 , 2017 and 2016 , respectively.

Minimum capital requirements

Minimum capital requirements	12 Months Ended
	Dec. 31, 2018
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 is 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 December 31, 2018 and 2017 , the Bank and Company met all capital adequacy requirements to which it is 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 December 31, 2018 and 2017 , the buffer was 1.88% and 1.25% , respectively. The capital conservative buffer will be fully phased in January 1, 2019 at 2.50%. 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 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 % 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, 2017 Total Capital (to risk-weighted assets) FB Financial Corporation $ 496,422 12.0 % $ 330,672 8.0 % $ 382,340 9.3 % N/A N/A FirstBank 466,102 11.3 % 329,984 8.0 % 381,544 9.3 % $ 412,480 10.0 % Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 472,381 11.4 % $ 247,969 6.0 % $ 299,629 7.3 % N/A N/A FirstBank 442,061 10.7 % 247,422 6.0 % 298,968 7.3 % $ 329,896 8.0 % Tier 1 Capital (to average assets) FB Financial Corporation $ 472,381 10.5 % $ 180,643 4.0 % N/A N/A N/A N/A FirstBank 442,061 9.8 % 180,987 4.0 % N/A N/A $ 226,234 5.0 % Common Equity Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 442,381 10.7 % $ 185,874 4.5 % $ 237,506 5.8 % N/A N/A FirstBank 442,061 10.7 % 185,567 4.5 % 237,113 5.8 % $ 268,041 6.5 %

Employee benefit plans

Employee benefit plans	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Employee benefit plans	Employee benefit plans: (A)—401(k) plan: The Bank has a 401(k) Plan (the “Plan”) whereby substantially all employees participate in the Plan. Employees may contribute the maximum amount of their eligible compensation subject to certain limits based on the federal tax laws. The Bank makes matching contributions of 25% of participant contributions not to exceed 6% of an employee’s total compensation. The Bank may also make discretionary Profit Sharing contributions. Matching and profit sharing contributions are vested equally over five years. For the years ended December 31, 2018 , 2017 and 2016 , the matching portions provided by the Bank to this Plan were $2,211 and $2,344 and $ 1,379 respectively, which includes the additional discretionary contribution of 25% match contributed in those years. (B)—Acquired supplemental retirement plans: In prior years, the Company assumed certain nonqualified supplemental retirement plans for certain former employees of acquired entities. At December 31, 2018 and 2017 , other liabilities on the consolidated balance sheet include post-retirement benefits payable of $1,260 and $1,510 , respectively, related to these plans. For the years ended December 31, 2018 , 2017 and 2016 , the Company recorded expense of $4 , $4 and $30 , respectively, related to these plans and payments to the participants were $191 , $191 and $205 in 2018 , 2017 and 2016 , respectively. The Company also acquired single premium life insurance policies on these individuals. At December 31, 2018 and 2017 , other assets on the consolidated balance sheet include $ 11,115 and $10,873 and reported cash value income (net of related insurance premium expense) of $158 , $164 and $181 in 2018 , 2017 and 2016 , respectively. (C)—Deferred compensation plans and agreements: The Bank granted awards (“EBI Units”) to certain employees pursuant to the FirstBank 2010 Equity Based Incentive Plan (the “2010 EBI Plan”), the FirstBank 2012 Equity Based Incentive Plan (the “2012 EBI Plan”) and the FirstBank Preferred Equity Based Incentive Plan (the “Preferred EBI Plan” and, together with the 2010 EBI Plan and the 2012 EBI Plan, the “EBI Plans”). Prior to the initial public offering, awards granted under EBI Plans were settled in cash only. Following the initial public offering, participants in the EBI Plans were given the one-time option to elect, for each EBI Unit vested to such participant, either (i) an amount in cash or (ii) a number of shares of Company common stock determined pursuant to a conversion formula that took into account the effect of the initial public offering. Consistent with the terms of the EBI Plans and approved by the Board of Directors, outstanding EBI Units were adjusted to reflect the 100 -for-one stock split that was effectuated prior to the IPO. The Bank also has a separate deferred compensation agreement with one key executive. Each plan or agreement is an unfunded general obligation of the Bank. The plans and agreements have varying vesting periods and other terms as follows: 2010 EBI Plan — Pursuant to the terms of the 2010 EBI Plan, each EBI Unit vests ratably over five years, or earlier upon a change of control, death or disability or retirement after age 65 . On or shortly following the vesting date, the holder of an EBI Unit will receive an amount in cash (or, if so elected by the participant following the IPO, in stock) equal to the fair market value of a share of common stock on the December 31 immediately preceding the payment date. Prior to the IPO, fair market value was determined by dividing 7.5% of the total assets of the Bank by the total number of outstanding common stock shares of the Company. Following the IPO, EBI Units are valued based upon the Company’s stock price. Units under this plan became fully vested January, 2017. Preferred EBI Plan —The Preferred EBI Plan has the same terms and conditions as those described above for the 2010 EBI Plan, with the exception of a seven year ratable vesting period. Units under this plan became fully vested January, 2017. 2012 EBI Plan — Pursuant to the terms of the 2012 EBI Plan, each EBI Unit vests and becomes payable following the third anniversary of the date of grant, or earlier upon a change of control, death or disability or retirement after age 65 . On or shortly following the vesting date, the holder of an EBI Unit will receive an amount in cash (or, if so elected by the participant following the IPO, in stock) equal to the fair market value of a share of common stock on the December 31 immediately preceding the payment date. Following the IPO, EBI Units are valued based upon the Company’s stock price. Prior to the IPO, fair market value of the Company was determined based upon the average of the sum of (a) 15 times the Company’s after-tax earnings, based on a default tax rate imposed by the Code, and (b) 1.5 times the Company’s tangible book value, defined as the consolidated equity of the Company less unrealized gains (losses) and less goodwill and intangible assets. Following the IPO, EBI Units outstanding under the 2012 EBI Plan were adjusted to prevent dilution of these EBI Units as a result of the IPO pursuant to the following conversion formula: (i) the number of EBI Units outstanding under the 2012 EBI Plan (as adjusted for the stock split), multiplied by (ii) 1.13 (determined by dividing $21.4085 , the fair market value per EBI Unit as determined under the 2012 EBI Plan, by $19.00 , the IPO price). Deferred compensation Agreement —Effective December 31, 2014, the Bank entered into an agreement with the Bank’s Chief Executive Officer to reward his prior service, pursuant to which he is entitled to receive a fixed lump sum cash payment equal to $3,000,000 on December 31, 2019 or the earlier occurrence of his separation of service or a change in control of the Company. On August 19, 2016, the Bank entered into an amendment to the deferred compensation agreement, pursuant to which the deferred account is now denominated in 157,895 deferred stock units, determined by dividing $3,000,000 by $19.00 (the IPO price). The deferred stock units are convertible on a 1-for-1 basis into shares of Company common stock on the original payment date described above. Summary —At December 31, 2018 and 2017 , the accompanying consolidated balance sheet include liabilities for cash-settled awards under the EBI Plans amounted to $993 and $2,346 , respectively. As of December 31, 2018 and 2017 , there were 29,172 and 67,470 units, respectively, in the equity based incentive plan for those employees who elected cash settlement of EBI units. Subsequent to December 31, 2018, these cash-settled awards were fully distributed. For the year ended December 31, 2018 and 2017 , the Company incurred expenses related to these plans and agreements totaling $3,787 and $3,685 , respectively, which is included in salaries, commissions and employee benefits in the accompanying statement of income. Additionally, payments under the plans totaled $1,818 and $5,163 , respectively, for 2018 and 2017 .

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2018
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. Additionally, following the initial public offering, participants in the EBI Plans (see Note 21) were given the option to elect conversion of their outstanding cash-settled units to stock-settled restricted stock units. The following table summarizes information about vested and unvested restricted stock units, excluding cash-settled EBI units discussed above, outstanding at December 31, 2018: For the year ended December 31, 2018 Restricted Stock Units Outstanding Weighted Average Grant Date Fair Value Balance at beginning of period 1,214,109 $ 19.97 Conversion of deferred compensation plan — — Conversion of equity based incentive (EBI) plans — — Grants 149,734 39.55 Released and distributed (vested) (207,478 ) 21.99 Forfeited/expired (16,150 ) 25.45 Balance at end of period 1,140,215 $ 21.96 The total fair value of restricted stock units vested and released, excluding cash-settled EBI units, was $4,562 , $2,202 and $2,997 for the years ended December 31, 2018 , 2017 and 2016, respectively. The compensation cost related to stock grants and vesting of restricted stock units, excluding cash-settled EBI units, was $7,436 , $8,184 and $4,693 for the years ended December 31, 2018 , 2017 and 2016, respectively. This included $645 and $551 paid to Company independent directors during the years ended December 31, 2018 and 2017, respectively, related to independent director grants and compensation elected to be settled in stock. There were no such grants to independent directors during the year ended December 31, 2016. The current period also includes a one-time expense of $249 related to the modification of vesting terms of certain grants As of December 31, 2018 and 2017 , there were $12,371 and $12,950 , 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 2.2 years and 2.8 years, respectively. At December 31, 2018, there was $226 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 years ended December 31, 2018 and 2017 , there were 28,609 shares and 18,658 shares of common stock issued under the ESPP, respectively. As of December 31, 2018 and 2017 , there were 2,432,356 and 2,460,965 shares available for issuance under the ESPP, respectively.

Related party transactions

Related party transactions	12 Months Ended
	Dec. 31, 2018
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 follows: Loans outstanding at January 1, 2018 $ 21,012 New loans and advances 21,828 Repayments (10,576 ) Loans outstanding at December 31, 2018 $ 32,264 Unfunded commitments to certain executive officers, certain management and directors and their associates totaled $15,000 and $4,672 at December 31, 2018 and 2017 , respectively. (B) Deposits: The Bank held deposits from related parties totaling $287,156 and $110,465 as of December 31, 2018 and 2017 , respectively. (C) Leases: The Bank leases various office spaces from entities owned by certain directors of the Company under varying terms. The Company had $116 and $137 in unamortized leasehold improvements related to these leases at December 31, 2018 and 2017 , respectively. These improvements are being amortized over a term not to exceed the length of the lease. Lease expense for these properties totaled $516 , $504 and $522 for the years ended December 31, 2018 , 2017 and 2016 , respectively. (D) Investment securities transactions: The Company holds an investment in a fund that was issued by an entity owned by one of its directors. The balance in the investment was $29 and $200 as of December 31, 2018 and 2017 , respectively. (E) Aviation time sharing agreement: Effective May 24, 2016, the Company entered an aviation time sharing agreement with an entity owned by certain directors of the Company. This replaces the previous agreement dated December 21, 2012. During the years ended December 31, 2018 and 2017 , the Company made payments of $208 and $176 , respectively, under these agreements. (F) Registration rights agreement: The Company is party to a registration rights agreement with its chairman of the Company’s board of directors (and former majority shareholder) that was 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 2018, the Company paid $671 under this agreement related to the secondary offering completed during the second quarter of 2018.

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent event	Subsequent event: The Company has evaluated subsequent events through March 12, 2019, the date these financial statements were available to be issued. As disclosed in Note 9, "Mortgage servicing rights," the Company closed on the sale of $29,416 of mortgage servicing rights on $2,034,374 of serviced mortgage loans. The Company will continue to service a portion of the loans until they can be transferred to the purchaser. No significant gain or loss was recognized related to this transaction. There were no other subsequent events, other than what was disclosed above, that occurred after December 31, 2018 , but prior to the issuance of these financial statements that would have a material impact on the Company’s consolidated financial statements.

Basis of presentation (Policies

Basis of presentation (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of presentation	(B) Basis of presentation: The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America and general banking industry. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and the reported results of operations for the year then ended. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to significant changes in the near term relate to the determination of the allowance for loan losses, investment securities determination of other-than-temporary impairment (“OTTI”), the determination of fair value in business combinations, the valuation of other real estate owned, and the determination of the fair value of financial instruments, loans held for sale and mortgage servicing rights. See Note 17 for additional information regarding the determination of fair value. The consolidated financial statements include the accounts of the Company, the Bank, and its’ wholly-owned subsidiaries, FirstBank Insurance, Inc. and Investors Title Company. All significant intercompany accounts and transactions have been eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current period presentation without any impact on the reported amounts of net income or shareholders’ equity.
Cash flows	(C) Cash flows: For purposes of reporting consolidated cash flows, cash and cash equivalents include cash on hand, amounts due from banks, federal funds sold and interest earning deposits in other financial institutions with maturities of less than 90 days at the date of purchase. These amounts are reported in the consolidated balance sheets caption “Cash and cash equivalents.” Net cash flows are reported for loans held for investment, deposits and borrowings.
Cash and cash equivalents	(D) Cash and cash equivalents: The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash and cash equivalents.
Investment securities	(E) Investment securities: Debt securities are classified as held to maturity and carried at amortized cost when management has the positive intent and ability to hold them to maturity. Debt securities are classified as available-for-sale when they might be sold before maturity. Available-for-sale debt securities are carried at fair value, with unrealized holding gains and losses reported in other comprehensive income, net of applicable taxes. Beginning as of January 1, 2018, equity securities with readily determinable market values are carried at fair value on the balance sheet with any periodic changes in value made through adjustments to the statement of income. Equity securities without readily determinable market values are carried at cost less impairment and included in other assets on the balance sheet. Interest income includes the amortization and accretion of purchase premium and discount. Premiums and discounts on securities are amortized on the level-yield method anticipating prepayments based upon the prior three month average monthly prepayments when available. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. The Company evaluates available-for-sale securities for other-than-temporary impairment at least on a quarterly basis, and more frequently when economic or market concerns warrant such evaluation. For securities in an unrealized loss position, consideration is given to the length of time and the extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. In analyzing an issuer’s financial condition, the Company considers whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred, and the results of reviews of the issuer’s financial condition. When OTTI is determined to have occurred, the amount of the OTTI recognized in earnings depends on whether we intend to sell the security or it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis. If we intend to sell the security or it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis, the OTTI recognized in earnings is equal to the entire difference between its amortized cost basis and its fair value at the date it was determined to be OTTI. If we do not intend to sell the security and it is not more likely than not that we will be required to sell the security before recovery of its amortized cost basis, the OTTI is separated into the amount representing the credit loss and the amount related to all other factors. The amount of the total related to the credit loss is determined based on the present value of cash flows expected to be collected and is recognized as a charge to earnings. The amount of the OTTI related to other factors is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the OTTI recognized in earnings becomes the new amortized cost basis of the investment. During the years ended December 31, 2018, 2017 and 2016, the Company did not record any OTTI on the available-for-sale portfolio; however, during the year ended December 31, 2017, the Company recognized impairment of $945 on one of its equity securities without a readily determinable market value as discussed in Note 4. There were no such impairment charges taken during the years ended December 31, 2018 or 2016. (F) Federal Home Loan Bank (FHLB) stock: The Bank accounts for its investments in FHLB stock in accordance with FASB ASC Topic 942-325 "Financial Services-Depository and Lending-Investments-Other." FHLB stock are equity securities that do not have a readily determinable fair value because its ownership is restricted and lacks a market. FHLB stock is carried at cost and evaluated for impairment.
Loans held for sale	(G) Loans held for sale: Loans originated and intended for sale in the secondary market, primarily mortgage loans, are carried at fair value as permitted under the guidance in ASC 825, “Financial Instruments” (“ASC 825”). Net (losses) gains of $(4,539) , $9,111 , and $(2,289) resulting from fair value changes of these mortgage loans were recorded in income during the years ended December 31, 2018 , 2017 and 2016 , respectively. The amount does not reflect changes in fair values of related derivative instruments used to hedge exposure to market-related risks associated with these mortgage loans. The change in fair value of both mortgage loans held for sale and the related derivative instruments are recorded in “Mortgage banking income” in the Consolidated Statements of Income. Gains and losses are recognized in Mortgage banking income on the consolidated statements of income at the time the loan is closed. Pass through origination costs and related loan fees are also included in “Mortgage banking income”. Effective December 31, 2017, the Company adopted a change in accounting policy to recognize revenue on Best Efforts deliveries and accrue commissions at the time of the interest rate lock commitment. Management believes this treatment better correlates and streamlines the revenue and expenses of mortgage sale delivery methods. Periodically, the Bank will transfer mortgage loans originated for sale in the secondary markets into the loan portfolio based on current market conditions, the overall secondary marketability of the loan and the status of the loan. During 2018 , 2017 , and 2016 , the Bank transferred $ 14,732 , $ 11,706 , and $ 17,963 , respectively, of residential mortgage loans into its portfolio. The loans are transferred into the portfolio at fair value at the date of transfer. On occasion, the Bank is able to restructure and sell certain of these mortgage loans previously originated to sell in the secondary market that were included in the Bank's loans held for investment portfolio. At the time of transfer, loans are marked to fair value through adjustment to the allowance for loan losses and reclassified to loans held for sale. During the year ended December 31, 2018, the Company transferred $11,888 of loans held for investment to loans held for sale, resulting in an adjustment to the allowance for loan losses of $349 . There were no such transfers during the years ended December 31, 2017 or 2016. Government National Mortgage Association (GNMA) optional repurchase programs allow financial institutions to buy back individual delinquent mortgage loans that meet certain criteria from the securitized loan pool for which the institution provides servicing and was the original transferor. At the servicer’s option and without GNMA’s prior authorization, the servicer may repurchase such a delinquent loan for an amount equal to 100 percent of the remaining principal balance of the loan. Under FASB ASC Topic 860, “Transfers and Servicing,” this buy-back option is considered a conditional option until the delinquency criteria are met, at which time the option becomes unconditional. When the Company is deemed to have regained effective control over these loans under the unconditional buy-back option, the loans can no longer be reported as sold and must be brought back onto the balance sheet as loans held for sale, regardless of whether the Company intends to exercise the buy-back option if the buyback option provides the transferor a more-than-trivial benefit. At December 31, 2018, there were $ 67,362 of delinquent GNMA loans that had previously been sold; however, the Company determined there was not 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 rebook the GNMA loans as of December 31, 2018. At December 31, 2017, rebooked GNMA loans held for sale amounted to $ 43,035 with an offsetting liability included in accrued expenses and other liabilities in the same amount. The fair value option election does not apply to the GNMA optional repurchase loans which do not meet the requirements under FASB ASC Topic 825 to be accounted for under the fair value option .
Loans (excluding purchased credit impaired loans)	(H) Loans (excluding purchased credit impaired loans): Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are stated at the principal amount outstanding less any purchase accounting discount net of any accretion recognized to date. Interest on loans is recognized as income by using the simple interest method on daily balances of the principal amount outstanding plus any accretion of purchase accounting discounts. Loans on which the accrual of interest has been discontinued are designated as nonaccrual loans. Accrual of interest is discontinued on loans past due 90 days or more unless the credit is well secured and in the process of collection. Also, a loan may be placed on nonaccrual status prior to becoming past due 90 days if management believes, after considering economic and business conditions and collection efforts, that the borrower’s financial condition is such that collection of principal or interest is doubtful. The decision to place a loan on nonaccrual status prior to becoming past due 90 days is based on an evaluation of the borrower’s financial condition, collateral liquidation value, economic and business conditions and other factors that affect the borrower’s ability to pay. When a loan is placed on nonaccrual status, the accrued but unpaid interest is charged against current period operations. Thereafter, interest on nonaccrual loans is recognized only as received if future collection of principal is probable. If the collectability of outstanding principal is doubtful, interest received is applied as a reduction of principal. A loan may be restored to accrual status when principal and interest are no longer past due or it otherwise becomes both well secured and collectability is reasonably assured.
Allowance for loan losses	(I) Allowance for loan losses: The allowance for loan losses is a valuation allowance for probable incurred credit losses. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. Management estimates the allowance balance required using past loan loss experience, the nature and volume of the portfolio, information about specific borrower situations and estimated collateral values, economic conditions, and other factors. Allocations of the allowance may be made for specific loans, but the entire allowance is available for any loan that, in management’s judgment, should be charged off. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. Commercial and commercial real estate loans over $250 are individually evaluated for impairment. If a loan is impaired, a portion of the allowance is allocated so that the loan is reported, net, at the present value of estimated future cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected solely from the collateral. Large groups of smaller balance homogeneous loans, such as consumer, residential real estate loans, commercial and commercial real estate loans less than $250 are collectively evaluated for impairment, and accordingly, they are not separately identified for impairment disclosures. Loans for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings (“TDRs”) and classified as impaired. TDRs are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate at inception. If a TDR is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. The general component covers non-impaired loans and is based on historical loss experience adjusted for current factors. The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Company over the most recent 5 years. This actual loss experience is supplemented with other economic factors based on the risks present for each portfolio segment. These economic factors include consideration of the following: levels of and trends in delinquencies and impaired loans; levels of and trends in charge-offs and recoveries; trends in volume and terms of loans; effects of any changes in risk selection and underwriting standards; other changes in lending policies, procedures, and practices; experience, ability, and depth of lending management and other relevant staff; national and local economic trends and conditions; industry conditions; and effects of changes in credit concentrations. The following portfolio segments have been identified: Commercial and industrial loans. The Company provides a mix of variable and fixed rate commercial and industrial loans. Commercial and industrial loans are typically made to small- and medium-sized manufacturing, wholesale, retail and service businesses for working capital and operating needs and business expansions, including the purchase of capital equipment and loans made to farmers relating to their operations. This category also includes loans secured by manufactured housing receivables. Commercial and industrial loans generally include lines of credit and loans with maturities of five years or less. The loans are generally made with operating cash flows as the primary source of repayment, but may also include collateralization by inventory, accounts receivable, equipment and/or personal guarantees. The ability of the borrower to collect accounts receivable, and to turn inventory into sales are risk factors in the repayment of the loan. Construction loans. Construction loans include commercial construction, land acquisition and land development loans and single-family interim construction loans to small- and medium-sized businesses and individuals. These loans are generally secured by the land or the real property being built and are made based on our assessment of the value of the property on an as-completed basis. We expect to continue to make construction loans at a similar pace so long as demand continues and the market for and values of such properties remain stable or continue to improve in our markets. These loans can carry risk of repayment when projects incur cost overruns, have an increase in the price of building materials, encounter zoning and environmental issues, or encounter other factors that may affect the completion of a project on time and on budget. Additionally, repayment risk may be negatively impacted when the market experiences a deterioration in the value of real estate. Residential real estate 1-4 family mortgage loans . The Company’s residential real estate 1-4 family mortgage loans are primarily made with respect to and secured by single family homes, which are both owner-occupied and investor owned and include manufactured homes with real estate. The Company intends to continue to make residential 1-4 family housing loans at a similar pace, so long as housing values in our markets do not deteriorate from current prevailing levels and we are able to make such loans consistent with our current credit and underwriting standards. First lien residential 1-4 family mortgages may be affected by unemployment or underemployment and deteriorating market values of real estate. Residential line of credit loans. The Company’s residential line of credit loans are primarily revolving, open-end lines of credit secured by 1-4 residential properties. The Company intends to continue to make home equity loans if housing values in our markets do not deteriorate from current prevailing levels and we are able to make such loans consistent with our current credit and underwriting standards. Second lien residential 1-4 family mortgages may be affected by unemployment or underemployment and deteriorating market values of real estate. Multi-family residential loans. The Company’s multi-family residential loans are primarily secured by multi-family properties, such as apartments and condominium buildings. These loans also may be affected by unemployment or underemployment and deteriorating market values of real estate. Commercial real estate loans . The Company’s commercial real estate owner-occupied loans include loans to finance commercial real estate owner occupied properties for various purposes including use as offices, warehouses, production facilities, health care facilities, retail centers, restaurants, churches and agricultural based facilities. Commercial real estate owner-occupied loans are typically repaid through the ongoing business operations of the borrower, and hence are dependent on the success of the underlying business for repayment and are more exposed to general economic conditions. Commercial real estate non-owner occupied loans . The Company’s commercial real estate non-owner occupied loans include loans to finance commercial real estate non-owner occupied investment properties for various purposes including use as offices, warehouses, health care facilities, hotels, mixed-use residential/commercial, manufactured housing communities, retail centers, assisted living facilities and agricultural based facilities. Commercial real estate non-owner occupied loans are typically repaid with the funds received from the sale of the completed property or rental proceeds from such property, and are therefore more sensitive to adverse conditions in the real estate market, which can also affected by general economic conditions. Consumer and other loans . The Company’s consumer and other loans include loans to individuals for personal, family and household purposes, including car, boat and other recreational vehicle loans, manufactured homes without real estate, and personal lines of credit. Consumer loans are generally secured by vehicles and other household goods. The collateral securing consumer loans may depreciate over time. The company seeks to minimize these risks through its underwriting standards. Other loans also include loans to states and political subdivisions in the U.S. These loans are generally subject to the risk that the borrowing municipality or political subdivision may lose a significant portion of its tax base or that the project for which the loan was made may produce inadequate revenue.
Business combinations, accounting for acquired loans and related assets	(J) Business combinations and accounting for acquired loans with credit deterioration: Business combinations are accounted for by applying the acquisition method in accordance with ASC 805, “Business Combinations” (“ASC 805”). Under the acquisition method, identifiable assets acquired and liabilities assumed and any non-controlling interest in the acquiree at the acquisition date are measured at their fair values as of that date. Any excess of the purchase price over fair value of net assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including any other identifiable intangible assets, exceed the purchase price, a bargain purchase gain is recognized. Results of operations of acquired entities are included in the Consolidated Statements of Income from the date of acquisition. Loans acquired in business combinations with evidence of credit deterioration since origination and for which it is probable that all contractually required payments will not be collected are considered to be credit-impaired. Purchased credit-impaired loans (“PCI” loans) are accounted for under the accounting guidance for loans and debt securities acquired with deteriorated credit quality, in accordance with ASC 310-30, “Loans and Debt Securities Acquired with Deteriorated Credit Quality” (“ASC 310-30”), and initially measured at fair value, which includes estimated future credit losses expected to be incurred over the life of the loans. Increases in expected cash flows to be collected on these loans are recognized as an adjustment of the loan’s yield over its remaining life, while decreases in expected cash flows are recognized as an impairment. As a result, related discounts are recognized subsequently through accretion based on the expected cash flow of the acquired loans or through adjustment to the allowance for loan loss for any impairment identified subsequent to acquisitions.
Premises and equipment	(K) Premises and equipment: Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. Provisions for depreciation are computed principally on the straight-line method and are charged to occupancy expense over the estimated useful lives of the assets. Maintenance agreements are amortized to expense over the period of time covered by the agreement. Costs of major additions, replacements or improvements are capitalized while expenditures for maintenance and repairs are charged to expense as incurred. For financial statement purposes, the estimated useful life for premises is forty years , for furniture and fixtures the estimated useful life is seven to ten years, for leasehold improvements the estimated useful life is the lesser of twenty years or the term of the lease and for equipment the estimated useful life is three to seven years.
Other real estate owned	(L) Other real estate owned: Real estate acquired through, or in lieu of, loan foreclosure is initially recorded at fair value less the estimated cost to sell at the date of foreclosure which may establish a new cost basis. Other real estate owned may also include excess facilities held for sale as described in Note 7. Physical possession of residential real estate property collateralizing a consumer mortgage loan occurs when legal title is obtained upon completion of foreclosure or when the borrower conveys all interest in the property to satisfy the loan. After initial measurement, valuations are periodically performed by management and the asset is carried at the lower of carrying amount or fair value less costs to sell. Revenue and expenses from operations are included in other noninterest income and noninterest expenses. Losses due to the valuation of the property are included in (loss) gain on sales or write-downs of other real estate owned.
Mortgage servicing rights	(M) Mortgage servicing rights: The Company retains the right to service certain mortgage loans that it sells to secondary market investors. The retained mortgage servicing right is initially recorded at the fair value of future net cash flows expected to be realized for performing servicing activities. Fair value is determined using an income approach with various assumptions including expected cash flows, prepayment speeds, market discount rates, servicing costs, and other factors. These mortgage servicing rights are recognized as a separate asset on the date the corresponding mortgage loan is sold. In periods prior to 2017, mortgage servicing rights were amortized in proportion to and over the period of estimated net servicing income. These servicing rights were carried at amortized cost less any impairment. Impairment losses on mortgage servicing rights were recognized to the extent by which the unamortized cost exceeded fair value. Impairment losses on mortgage servicing rights of $4,678 was recognized in earnings during the year ended December 31, 2016 . As of January 1, 2017, the Company elected to account for its mortgage servicing rights under the fair value option as permitted under ASC 860-50-35, Transfers and Servicing. The change in accounting policy resulted in a one-time adjustment to retained earnings of $615 for the after-tax increase in fair value above book value at the time of adoption. Subsequent changes in fair value are recorded in earnings in Mortgage banking income.
Transfers of financial assets	(N) Transfers of financial assets: Transfers of financial assets are accounted for as sales, when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
Goodwill and other intangibles	(O) Goodwill and other intangibles: Goodwill represents the excess of the cost of an acquisition over the fair value of the net assets acquired. Goodwill impairment testing is performed annually or more frequently if events or circumstances indicate possible impairment. Goodwill is assigned to the Company’s reporting units, Banking or Mortgage as applicable. See Note 2, “Mergers and acquisitions” for information related to the goodwill recorded in the Bank’s acquisitions of Clayton Bank and Trust and American City Bank. Goodwill is evaluated for impairment by either performing a qualitative evaluation or a two -step quantitative test. The qualitative evaluation is an assessment of factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount, including goodwill. If an entity does a qualitative assessment and determines that it is not more likely than not the fair value of a reporting unit is less than its carrying amount, then goodwill of the reporting unit is not considered impaired, and it is not necessary to continue to the two-step goodwill impairment test. If the estimated implied fair value of goodwill is less than the carrying amount, an impairment loss would be recognized in noninterest expense to reduce the carrying amount to the estimated implied fair value which could be material to our operating results for any particular reporting period. No impairment was identified through the qualitative annual assessments for impairment performed as of December 31, 2018 and 2016. A quantitative assessment was performed for the year ended December 31, 2017 which also indicated no impairment. Other intangible assets consist of core deposit intangible assets arising from whole bank and branch acquisitions in addition to an operating lease intangible, customer trust intangible and manufactured housing loan servicing intangible recorded in conjunction with the acquisition of the Clayton Banks completed on July 31, 2017 (see Note 2). All intangible assets are initially measured at fair value and then amortized over their estimated useful lives. See Note 8 for additional information on other intangibles.
Income taxes	(P) Income taxes: Prior to September 16, 2016, the Company was taxed under the provisions of subchapter S of the Internal Revenue Code. Under these provisions, the Company did not pay corporate federal income taxes on its taxable income but was liable for Tennessee corporate income taxes. Instead, the shareholder was liable for individual income taxes on the Company’s taxable income. The Company and the Bank file consolidated federal and state income tax returns. Unaudited pro forma amounts for income tax expense, net income and basic and diluted earnings per common share have been presented assuming the Company’s pro forma effective tax rate of 36.75% for the year ended December 31, 2016 as if it had been a C corporation during the full year. In addition, the unaudited pro forma results for the year ended December 31, 2016 excludes the effect of recognition of the deferred tax liability attributable to conversion of $13,181 as discussed in Note 13. Income tax expense is the total of the current year income tax due and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes. See Note 13, “Income taxes” for information related to the impact of the Tax Cuts and Jobs Act signed into law on December 22, 2017. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. The Company’s policy is to recognize interest and penalties on uncertain tax positions in “Income tax expense” in the Consolidated Statements of Income.
Long-lived assets	(Q) Long-lived assets: Premises and equipment, core deposit intangible assets, and other long-lived assets are reviewed for impairment when events indicate their carrying amount may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value.
Off-Balance sheet financial instruments	(R) Off-balance sheet financial instruments: Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded, unless considered derivatives.
Derivative financial instruments and hedging activities	(S) Derivative financial instruments and hedging activities: All derivative financial instruments are recorded at their fair values in other assets or other liabilities in the consolidated balance sheets in accordance with ASC 815, “Derivatives and Hedging.” If derivative financial instruments are designated as hedges of fair values, both the change in the fair value of the hedge and the hedged item are included in current earnings. If derivative financial instruments are not designated as hedges, only the change in the fair value of the derivative instrument is included in current earnings. Cash flow hedges are utilized to mitigate the exposure to variability in expected future cash flows or other types of forecasted transactions. For the Company’s derivatives designated as cash flow hedges, changes in the fair value of cash flow hedges are, to the extent that the hedging relationship is effective, recorded as other comprehensive income and are subsequently recognized in earnings at the same time that the hedged item is recognized in earnings. The ineffective portions of the changes in fair value of the hedging instruments are immediately recognized in earnings. The assessment of the effectiveness of the hedging relationship is evaluated under the hypothetical derivative method. The Company also utilizes derivative instruments that are not designated as hedging instruments. The Company enters into interest rate cap and/or floor agreements with its customers and then enters into an offsetting derivative contract position with other financial institutions to mitigate the interest rate risk associated with these customer contracts. Because these derivative instruments are not designated as hedging instruments, changes in the fair value of the derivative instruments are recognized currently in earnings. The Company also enters into commitments to originate loans whereby the interest rate on the loan is determined prior to funding (rate-lock commitments). Rate-lock commitments on mortgage loans that are intended to be sold are considered to be derivatives. Accordingly, such commitments, along with any related fees received from potential borrowers, are recorded at fair value in other assets or liabilities, with changes in fair value recorded in the line item “Mortgage banking income” on the Consolidated Statements of Income. Fair value is based on fees currently charged to enter into similar agreements, and for fixed-rate commitments, the difference between current levels of interest rates and the committed rates is also considered. The Company utilizes forward loan sale contracts and forward sales of residential mortgage-backed securities to mitigate the interest rate risk inherent in the Company’s mortgage loan pipeline and held-for-sale portfolio. Forward sale contracts are contracts for delayed delivery of mortgage loans or a group of loans pooled as mortgage-backed securities. The Company agrees to deliver on a specified future date, a specified instrument, at a specified price or yield. However, the contract may allow for cash settlement. The credit risk inherent to the Company arises from the potential inability of counterparties to meet the terms of their contracts. In the event of non-acceptance by the counterparty, the Company would be subject to the credit and inherent (or market) risk of the loans retained. Such contracts are accounted for as derivatives and, along with related fees paid to investor are recorded at fair value in derivative assets or liabilities, with changes in fair value recorded in the line item “Mortgage banking income” on the Consolidated Statements of Income. Fair value is based on the estimated amounts that the Company would receive or pay to terminate the commitment at the reporting date. The Company utilizes two methods to deliver mortgage loans sold to an investor. Under a “best efforts” sales agreement, the Company enters into a sales agreement with an investor in the secondary market to sell the loan when an interest rate-lock commitment is entered into with a customer, as described above. Under a “best efforts” sales agreement, the Company is obligated to sell the mortgage loan to the investor only if the loan is closed and funded. Thus, the Company will not incur any liability to an investor if the mortgage loan commitment in the pipeline fails to close. The Company also utilizes “mandatory delivery” sales agreements. Under a mandatory delivery sales agreement, the Company commits to deliver a certain principal amount of mortgage loans to an investor at a specified price and delivery date. Penalties are paid to the investor should the Company fail to satisfy the contract. Mandatory commitments are recorded at fair value in the Company’s Consolidated Balance Sheets. Gains and losses arising from changes in the valuation of these commitments are recognized currently in earnings and are reflected under the line item “Mortgage banking income” on the Consolidated Statements of Income.
Lender risk account	(T) Lender risk account: During 2018 the Company began selling qualified mortgage loans to FHLB-Cincinnati via the Mortgage Purchase Program (“MPP”). All mortgage loans purchased from members through the MPP are held on the FHLB’s balance sheet. FHLB does not securitize MPP loans for sale to other investors. They mitigate their credit risk exposure through their underwriting and pool composition requirements and through the establishment of the Lender Risk Account (“LRA”) credit enhancement. The LRA protects the FHLB against possible credit losses by setting aside a portion of the initial purchase price into a performance based escrow account that can be used to offset possible loan losses. The LRA amount is established as a percentage applied to the sum of the initial unpaid principal balance of each mortgage in the aggregated pool at the time of the purchase of the mortgage as determined by the FHLB-Cincinnati and is funded by the deduction from the proceeds of sale of each mortgage in the aggregated pool to the FHLB-Cincinnati. The Company had on deposit with the FHLB-Cincinnati $5,225 at December 31, 2018 in these LRA’s. These accounts are held by the FHLB-Cincinnati and the Company bears the risk of receiving less than 100% of its LRA contribution in the event of losses, either by the Company or other members selling mortgages in the aggregated pool. Any losses will be deducted first from the individual LRA contribution of the institution that sold the mortgage of which the loss was incurred. If losses incurred in the aggregated pool are greater than the member’s LRA contribution, such losses will be deducted from the LRA contribution of other members selling mortgages in that aggregated pool. Any portion of the LRA not used to pay losses will be released over a thirty year period and will not start until the end of five years after the initial fill-up period.
Comprehensive income	(U) Comprehensive income: Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on available-for-sale securities and derivatives designated as cash flow hedges, net of taxes.
Loss contingencies	(V) Loss contingencies: Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Management does not believe there are such matters that will have a material effect on the financial statements.
Securities sold under agreements to repurchase	(W) Securities sold under agreements to repurchase: The Company routinely sells securities to certain customers and then repurchases the securities the next business day. Securities sold under agreements to repurchase are recorded on the consolidated balance sheets at the amount of cash received in connection with each transaction in the line item "Borrowings". These are secured liabilities and are not covered by the Federal Deposit Insurance Corporation.
Advertising expense	(X) Advertising expense: Advertising costs, including costs related to internet mortgage marketing and related costs, are expensed as incurred.
Earnings per common share	(Y) Earnings per common share: Basic earnings per common share ("EPS") excludes dilution and is computed by dividing earnings attributable to common shareholders by the weighted average number of common shares outstanding during the period. Diluted EPS includes the dilutive effect of additional potential common shares issuable under the restricted stock units granted but not yet vested and distributable. DIluted EPS is computed by dividing earnings attributable to common shareholders by the weighted average number of common shares outstanding for the year, plus an incremental number of common-equivalent shares computed using the treasury stock method. Unvested share-based payment awards, which include the right to receive non-forfeitable dividends or dividend equivalents, are considered to participate with common shareholders in undistributed earnings for purposes of computing EPS. Companies that have such participating securities, including the Company, are required to calculate basic and diluted EPS using the two-class method. Certain restricted stock awards granted by the Company include non-forfeitable dividend equivalents and are considered participating securities. Calculations of EPS under the two-class method (i) exclude from the numerator any dividends paid or owed on participating securities and any undistributed earnings considered to be attributable to participating securities and (ii) exclude from the denominator the dilutive impact of the participating securities.
Segment reporting	(Z) Segment reporting: The Company’s Mortgage division represents a distinct reportable segment which differs from the Company’s primary business of Banking. Accordingly, a reconciliation of reportable segment revenues, expenses and profit to the Company’s consolidated total has been presented in Note 19.
Stock-based compensation	(AA) Stock-based compensation: Stock-based compensation expense is recognized in accordance with ASC 718-20, “ Compensation – Stock Compensation Awards Classified as Equity”. Expense is recognized based on the fair value of the portion of stock-based payment awards that are ultimately expected to vest, reduced for forfeitures based on grant-date fair value. The restricted stock unit awards and related expense are amortized over the required service period, if any.
Recently adopted accounting principles and Newly issued not yet effective accounting standards	(AB) Recently adopted accounting principles: In May 2014, the FASB issued an update to Accounting Standards Update (“ASU”) No. 2014-9, “Revenue from Contracts with Customers” (FASB Topic 606). The Company adopted this guidance on January 1, 2018 and all subsequent amendments to the ASU (collectively, "ASC 606") which (i) creates a single framework for recognizing revenue from contracts with customers that fall within its scope and (ii) revises when it is appropriate to recognize a gain (loss) from the transfer of nonfinancial assets, such as OREO. The majority of the Company's revenues come from interest income and other sources, including loans, leases, securities, and derivatives that are outside the scope of ASC 606. The Company's services that fall within the scope of ASC 606 are presented within Noninterest income and are recognized as revenue as the Company satisfies its obligation to the customer. Services within the scope of ASC 606 include deposit service charges on deposits, interchange income, investment services and trust income, and the sale of OREO, all within the Banking Segment. The Company has evaluated the effect of this updated on these fee-based income streams and concluded that adoption did not result in a change to the accounting for any of the in-scope revenue streams; as such, no cumulative effect adjustment was recorded. The following is a summary of the implementation considerations for the revenue streams that fall within the scope of Topic 606: • Service charges on deposits, investment services and trust income, and interchange fees -- Fees from these services are either transaction based, for which the performance obligations are satisfied when the individual transaction is processed, or set periodic service charges, for which the performance obligations are satisfied over the period the service is provided. Transaction based fees are recognized at the time the transaction is processed, and periodic service charges are recognized over the service period. The adoption of Topic 606 had no impact on the Company's revenue recognition practice for these services. • Gains on sales of other real estate -- ASU 2014-09 creates Topic 610-20, under which a gain on sale should be recognized when a contract for sale exists and control of the asset has been transferred to the buyer. Topic 606 list several criteria which must exist to conclude that a contract for sale exists, including a determination that the institution will collect substantially all of the consideration to which it is entitled. This presents a key difference between the current and new guidance related to the recognition of the gain when the institution finances the sale of the property. Rather than basing recognition on the amount of the buyer's initial investment, which was the primary consideration under prior guidance, the analysis is now based on various factors including not only the loan to value, but also the credit quality of the borrower, the structure of the loan, and any other factors that may affect collectability. While these differences may affect the decision to recognize or defer gains on sales of other real estate in circumstances where the Company has financed the sale, these amounts have not been material to its financial statements. In January 2016, the FASB released ASU 2016-1, “Recognition and Measurement of Financial Assets and Liabilities.” The main provisions of the update are to eliminate the available for sale classification of accounting for equity securities and adjust the fair value disclosures for financial instruments carried at amortized cost such that the disclosed fair values represent an exit price as opposed to an entry price. The provisions of this update will require that equity securities be carried at fair market value on the balance sheet and any periodic changes in value will be adjustments to the income statement. A practical expedient is provided for equity securities without a readily determinable fair value such that these securities can be carried at cost less any impairment. Results for reporting periods beginning after January 1, 2018 are presented under this method while prior period disclosures are presented under legacy GAAP. On January 1, 2018, the Company recorded a net loss in beginning retained earnings of $109 in connection with this transition. In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments (Topic 230)." ASU 2016-15 provides guidance related to certain cash flow issues in order to reduce the current and potential future diversity in practice. This adoption did not have an impact on our financial statements. In May 2017, the FASB issued ASU 2017-9, “Stock Compensation - Scope of Modification Accounting (Topic 718): Scope of Modification Accounting.” The amendments in this ASU provide guidance on when changes to the terms or conditions of a share-based payment award are to be accounted for as modifications. Under ASU 2017-9, entities are not required to apply modification accounting to a share-based payment award when the award’s fair value, vesting conditions, and classification as an entity or a liability instrument remain the same after the change. ASU 2017-9 is effective for all entities beginning after December 15, 2017 including interim periods within the fiscal year. The adoption of this update on January 1, 2018 did not have a significant impact on the Company's consolidated financial statements. In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities.” The amendments in this ASU make more financial and non-financial hedging strategies eligible for hedge accounting. It also amends the presentation and disclosure requirements and changes how companies assess effectiveness. The Company elected to early adopt this update effective January 1, 2018. The adoption of this standard did not have a significant impact on our consolidated financial statements. In February 2018, the FASB issued ASU 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” The amendments in this ASU addressed the income tax accounting treatment of the stranded tax effects within other comprehensive income due to the newly enacted federal corporate tax rate included in the Tax Cuts and Jobs Act issued December 22, 2017. These amendments allow an entity to make a reclassification from other comprehensive income to retained earnings for the difference between the historical corporate income tax rate and the newly enacted corporate income tax rate. The amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those years. Early adoption is permitted, including adoption in any interim period, for public companies for reporting periods for which financial statements have not yet been issued. The Company elected to early adopt ASU 2018-2 for the year ended December 31, 2017 and, as a result, reclassified $652 from accumulated other comprehensive income to retained earnings resulting from the income tax effect of the Tax Cuts and Jobs Act as of January 1, 2018. Newly issued not yet effective accounting standards: In February 2016, the FASB issued ASU 2016-2, “Leases (Topic 842).” The update will require 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 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 will 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. The Company obtained a third-party software application to provide lease contract maintenance and lease accounting under the guidelines of the new standard. Management is currently finalizing the evaluation of the Company’s lease obligations as potential lease assets and liabilities and defined by ASU 2016-02; however, the adoption of ASU 2016-02 is not expected to have a material impact on the Company’s consolidated financial statements. Based on Management’s preliminary analysis of existing lease contracts at December 31, 2018, it is estimated that the adoption of ASU 2016-02 will result in an increase to the Company's consolidated balance sheet to be between 0.4% and 0.8% of total assets. The Company has an immaterial amount of leases in which it is the lessor and does not expect the provisions of these updates to have any material impact on retaining earnings or the Consolidated statements of income. Disclosures required by the amendments of ASU 2016-02 will be presented beginning with the Quarterly Report on From 10-Q for the period ending March 31, 2019. 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). 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 has 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 has selected a software vendor and is working on identifying data needs for modeling inputs and identifying appropriate modeling methodologies across our loan segments. During 2019, the Company is focused on model completion and finalizing assumptions with parallel processing of our existing allowance for loan losses model with the CECL model targeted for the second half of 2019, depending on how model completion and validation progresses. Management is also working to establish appropriate accounting policies to address new processes and controls under this update. The Company is currently evaluating the impact of this adoption on it’s 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. Management expects to disclose a range estimate of this impact on Form 10-Q for the quarterly period ended September 30, 2019. In December 2018, the OCC, the Board of Governors of the Federal Reserve System, and the FDIC approved a final rule to address changes to credit loss accounting under GAAP, including banking organizations’ implementation of CECL. The final rule provides banking organizations the option to phase in over a three-year period the day-one adverse effects on regulatory capital that may result from the adoption of the new accounting standard. In 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. If this standard had been effective for the year ended December 31, 2018 , there would have been no impact on our 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 must prospectively apply the amendments in this ASU to annual periods beginning after December 15, 2018, including interim periods. The adoption of this update will not have an impact on the Company's consolidated financial statements. 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 of the company. 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.

Basis of presentation (Tables)

Basis of presentation (Tables)	12 Months Ended
	Dec. 31, 2018
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: December 31, 2018 2017 2016 Basic earnings per common share calculation: Net income $ 80,236 $ 52,398 $ 40,591 Dividends paid on and undistributed earnings allocated to (428 ) — — Earnings attributable to common shareholders $ 79,808 $ 52,398 $ 40,591 Weighted-average basic shares outstanding 30,675,755 27,627,228 19,165,182 Basic earnings per common share $ 2.60 $ 1.90 $ 2.12 Diluted earnings per common share: Earnings attributable to common shareholders 79,808 52,398 40,591 Weighted-average basic shares outstanding 30,675,755 27,627,228 19,165,182 Weighted-average diluted shares contingently issuable 639,226 580,374 146,992 Weighted-average diluted shares outstanding 31,314,981 28,207,602 19,312,174 Diluted earnings per common share $ 2.55 $ 1.86 $ 2.10 Pro forma earnings per common share: Pro forma earnings attributable to common shareholders $ 79,808 $ 52,398 $ 39,422 Weighted-average basic shares outstanding 30,675,755 27,627,228.00 19,165,182.00 Pro forma basic earnings per common share $ 2.60 $ 1.90 $ 2.06 Pro forma diluted earnings per common share: Pro forma earnings attributable to common shareholders $ 79,808 $ 52,398 $ 39,422 Weighted-average diluted shares outstanding 31,314,981 28,207,602 19,312,174 Pro forma diluted earnings per common share $ 2.55 $ 1.86 $ 2.04

Mergers and acquisitions (Table

Mergers and acquisitions (Tables)	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following tables present the final estimated fair value of net assets acquired as of the July 31, 2017 acquisition date and the consideration paid and an allocation of the purchase price to net assets acquired: As of July 31, 2017 As Recorded by FB Financial Corporation (1) Assets Cash and cash equivalents $ 49,059 Investment securities 59,493 FHLB stock 3,409 Loans 1,059,728 Allowance for loan losses — Premises and equipment 18,866 Other real estate owned 6,888 Intangibles, net 12,334 Other assets 5,978 Total assets $ 1,215,755 Liabilities Interest-bearing deposits $ 670,054 Noninterest-bearing deposits 309,464 Borrowings 84,831 Accrued expenses and other liabilities 5,245 Total liabilities 1,069,594 Net assets acquired $ 146,161
Schedule of Consideration Paid and Allocation of Purchase Price to Net Assets Acquired	Purchase price: Equity consideration Common stock issued 1,521,200 Price per share as of July 31, 2017 $ 34.37 Total equity consideration $ 52,284 Cash consideration 184,200 (2) Total consideration paid $ 236,484 Preliminary allocation of consideration paid: Fair value of net assets acquired including identifiable intangible assets $ 146,161 Goodwill 90,323 Total consideration paid $ 236,484 (1) Amounts include certain reclassifications of opening balances to conform to the Company’s presentation. (2) Amount was deposited into an interest-bearing deposit account with the Bank in the name of the Seller as of July, 31, 2017.
Business Acquisition, Pro Forma Information	Actual revenues and earnings of the Clayton Banks since the merger date have not been disclosed as it is not practicable as the Clayton Banks were merged into the Company and separate financial information is not readily available. Year Ended December 31, 2017 2016 Net interest income $ 192,633 $ 171,383 Total revenues $ 336,404 $ 322,045 Net income $ 75,659 $ 64,608

Investment securities (Tables)

Investment securities (Tables)	12 Months Ended
	Dec. 31, 2018
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 December 31, 2018 and 2017 are shown below: 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 December 31, 2018, the Company also had $ 3,107 in marketable equity securities recorded at fair value. Net losses of $ 81 were recognized due to changes in fair value of these securities during the year ended December 31, 2018. As of January 1, 2018, the Company adopted ASU 2016-01 (See Note 1) and reclassified $3,604 of other securities without readily determinable market values to other assets. December 31, 2017 Amortized cost Gross unrealized gains Gross unrealized losses Fair Value Investment Securities Available-for-sale debt securities U.S. government agency securities $ 999 $ — $ (13 ) $ 986 Mortgage-backed securities - residential 425,557 374 (7,150 ) 418,781 Municipals, tax exempt 107,127 2,692 (568 ) 109,251 Treasury securities 7,345 — (93 ) 7,252 Total debt securities 541,028 3,066 (7,824 ) 536,270 Equity securities 7,870 1 (149 ) 7,722 Total securities available-for-sale $ 548,898 $ 3,067 $ (7,973 ) $ 543,992
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. Year Ended December 31, 2018 2017 Available-for-sale Available-for-sale Amortized cost Fair value Amortized cost Fair value Due in one year or less $ 15,883 $ 16,028 $ 905 $ 925 Due in one to five years 13,806 13,740 28,332 28,878 Due in five to ten years 18,539 18,387 19,218 19,588 Due in over ten years 99,151 98,963 67,016 68,098 147,379 147,118 115,471 117,489 Mortgage-backed securities - residential 520,654 508,580 425,557 418,781 Total debt securities $ 668,033 $ 655,698 $ 541,028 $ 536,270
Summary of Sales of Available-for-Sale Securities	Sales of available-for-sale securities were as follows: Year Ended December 31, 2018 2017 2016 Proceeds from sales $ 2,742 $ 94,743 $ 271,148 Gross realized gains 8 1,277 4,755 Gross realized losses 44 48 348
Schedule of Gross Unrealized Losses	The Company also recognized $ 1 and $ 1 on gains related to the early call of available for sale securities during the years ended December 31, 2018 and December 31, 2017, respectively. The following tables show gross unrealized losses at December 31, 2018 and 2017 , aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position: 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 debt securities $ 87,858 $ (844 ) $ 369,343 $ (14,247 ) $ 457,201 $ (15,091 ) December 31, 2017 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 $ — $ — $ 986 $ (13 ) $ 986 $ (13 ) Mortgage-backed securities - residential 107,611 (980 ) 290,258 (6,170 ) 397,869 (7,150 ) Municipals, tax exempt 7,354 (101 ) 20,112 (467 ) 27,466 (568 ) Treasury securities 7,252 (93 ) — — 7,252 (93 ) Total debt securities 122,217 (1,174 ) 311,356 (6,650 ) 433,573 (7,824 ) Equity securities — — 3,050 (149 ) 3,050 (149 ) $ 122,217 $ (1,174 ) $ 314,406 $ (6,799 ) $ 436,623 $ (7,973 )

Loans and allowance for loan _2

Loans and allowance for loan losses (Tables)	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Loans Outstanding by Major Lending Classification	Loans outstanding at December 31, 2018 and 2017 , by major lending classification are as follows: December 31, 2018 2017 Commercial and industrial $ 867,083 $ 715,075 Construction 556,051 448,326 Residential real estate: 1-to-4 family mortgage 555,815 480,989 Residential line of credit 190,480 194,986 Multi-family mortgage 75,457 62,374 Commercial real estate: Owner occupied 493,524 495,872 Non-owner occupied 700,248 551,588 Consumer and other 228,853 217,701 Gross loans 3,667,511 3,166,911 Less: Allowance for loan losses (28,932 ) (24,041 ) Net loans $ 3,638,579 $ 3,142,870
Schedule of Changes Value of Accretable Yield of PCI Loans	The following table presents changes in the value of the accretable yield for PCI loans for the periods indicated. Year Ended 2018 2017 2016 Balance at the beginning of period $ (17,682 ) $ (2,444 ) $ (1,637 ) Additions through the acquisition of the Clayton Banks — (18,868 ) — Principal reductions and other reclassifications from nonaccretable difference (4,047 ) (1,841 ) (3,438 ) Recoveries — (23 ) — Accretion 9,010 5,299 2,631 Changes in expected cash flows (3,868 ) 195 — Balance at end of period $ (16,587 ) $ (17,682 ) $ (2,444 )
Allowance for Loan Losses by Portfolio Segment and Related Investment in Loans Net of Unearned Interest	The following provides the allowance for loan losses by portfolio segment and the related investment in loans net of unearned interest for the years December 31, 2018 , 2017 and 2016 : Commercial and industrial Construction 1-to-4 family residential mortgage Residential line of credit Multi- family residential mortgage Commercial real estate owner occupied Commercial real estate non-owner occupied Consumer and other Total Year Ended December 31, 2018 Beginning balance - December 31, 2017 $ 4,461 $ 7,135 $ 3,197 $ 944 $ 434 $ 3,558 $ 2,817 $ 1,495 $ 24,041 Provision for loan losses 1,395 1,459 547 (275 ) 132 (478 ) 1,281 1,337 5,398 Recoveries of loans previously charged-off 390 1,164 171 178 — 143 51 550 2,647 Loans charged off (898 ) (29 ) (138 ) (36 ) — (91 ) — (1,613 ) (2,805 ) Adjustments for transfers to loans HFS — — (349 ) — — — — — (349 ) Ending balance - December 31, 2018 $ 5,348 $ 9,729 $ 3,428 $ 811 $ 566 $ 3,132 $ 4,149 $ 1,769 $ 28,932 Commercial and industrial Construction 1-to-4 family residential mortgage Residential line of credit Multi- family residential mortgage Commercial real estate owner occupied Commercial real estate non-owner occupied Consumer and other Total Year Ended December 31, 2017 Beginning balance - December 31, 2016 $ 5,309 $ 4,940 $ 3,197 $ 1,613 $ 504 $ 3,302 $ 2,019 $ 863 $ 21,747 Provision for loan losses (2,158 ) 1,138 41 (788 ) (70 ) 483 (848 ) 1,252 (950 ) Recoveries of loans previously charged-off 1,894 1,084 159 395 — 61 1,646 532 5,771 Loans charged off (584 ) (27 ) (200 ) (276 ) — (288 ) — (1,152 ) (2,527 ) Ending balance - December 31, 2017 $ 4,461 $ 7,135 $ 3,197 $ 944 $ 434 $ 3,558 $ 2,817 $ 1,495 $ 24,041 Commercial and industrial Construction 1-to-4 family residential mortgage Residential line of credit Multi- family residential mortgage Commercial real estate owner occupied Commercial real estate non-owner occupied Consumer and other Total Year Ended December 31, 2016 Beginning balance - December 31, 2015 $ 5,135 $ 5,143 $ 4,176 $ 2,201 $ 311 $ 3,682 $ 2,622 $ 1,190 $ 24,460 Provision for loan losses 212 (417 ) (882 ) (630 ) 193 (271 ) (271 ) 587 (1,479 ) Recoveries of loans previously charged-off 524 216 127 174 — 140 195 240 1,616 Loans charged off (562 ) (2 ) (224 ) (132 ) — (249 ) (527 ) (1,154 ) (2,850 ) Ending balance - December 31, 2016 $ 5,309 $ 4,940 $ 3,197 $ 1,613 $ 504 $ 3,302 $ 2,019 $ 863 $ 21,747
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 December 31, 2018 , 2017 and 2016 : 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 December 31, 2017 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 $ 20 $ — $ 18 $ — $ — $ 120 $ 33 $ — $ 191 Collectively evaluated for impairment 4,441 7,135 3,179 944 434 3,438 2,784 1,495 23,850 Acquired with deteriorated credit quality — — — — — — — — — Ending balance - December 31, 2017 $ 4,461 $ 7,135 $ 3,197 $ 944 $ 434 $ 3,558 $ 2,817 $ 1,495 $ 24,041 December 31, 2016 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 $ 135 $ — $ 23 $ — $ — $ 113 $ 242 $ — $ 513 Collectively evaluated for impairment 5,174 4,940 3,174 1,613 504 3,189 1,777 863 21,234 Acquired with deteriorated credit quality — — — — — — — — — Ending balance - December 31, 2016 $ 5,309 $ 4,940 $ 3,197 $ 1,613 $ 504 $ 3,302 $ 2,019 $ 863 $ 21,747
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 December 31, 2018 , 2017 and 2016 : 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 December 31, 2017 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 $ 1,579 $ 1,289 $ 1,262 $ — $ 978 $ 2,520 $ 1,720 $ 25 $ 9,373 Collectively evaluated for impairment 711,352 439,309 456,229 194,986 61,376 481,390 531,704 192,357 3,068,703 Acquired with deteriorated credit quality 2,144 7,728 23,498 — 20 11,962 18,164 25,319 88,835 Ending balance - December 31, 2017 $ 715,075 $ 448,326 $ 480,989 $ 194,986 $ 62,374 $ 495,872 $ 551,588 $ 217,701 $ 3,166,911 December 31, 2016 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 $ 1,476 $ 2,686 $ 2,471 $ 311 $ 1,027 $ 2,752 $ 2,201 $ 27 $ 12,951 Collectively evaluated for impairment 384,279 238,900 290,346 176,879 43,922 350,812 260,361 74,276 1,819,775 Acquired with deteriorated credit quality 478 4,319 2,107 — 28 3,782 5,340 4 16,058 Ending balance - December 31, 2016 $ 386,233 $ 245,905 $ 294,924 $ 177,190 $ 44,977 $ 357,346 $ 267,902 $ 74,307 $ 1,848,784
Credit Quality Indicators by Portfolio Class	The following tables show credit quality indicators by portfolio class at December 31, 2018 and 2017 : 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 December 31, 2017 Pass Watch Substandard Total Loans, excluding purchased credit impaired loans Commercial and industrial $ 657,595 $ 50,946 $ 4,390 $ 712,931 Construction 431,242 7,388 1,968 440,598 Residential real estate: 1-to-4 family mortgage 440,202 9,522 7,767 457,491 Residential line of credit 192,427 1,184 1,375 194,986 Multi-family mortgage 61,234 142 978 62,354 Commercial real estate: Owner occupied 451,140 28,308 4,462 483,910 Non-owner occupied 517,253 14,199 1,972 533,424 Consumer and other 189,081 2,712 589 192,382 Total loans, excluding purchased credit impaired loans $ 2,940,174 $ 114,401 $ 23,501 $ 3,078,076 Purchased credit impaired loans Commercial and industrial $ — $ 1,499 $ 645 $ 2,144 Construction — 3,324 4,404 7,728 Residential real estate: 1-to-4 family mortgage — 20,284 3,214 23,498 Residential line of credit — — — — Multi-family mortgage — — 20 20 Commercial real estate: Owner occupied — 4,631 7,331 11,962 Non-owner occupied — 7,359 10,805 18,164 Consumer and other — 19,751 5,568 25,319 Total purchased credit impaired loans $ — $ 56,848 $ 31,987 $ 88,835 Total loans $ 2,940,174 $ 171,249 $ 55,488 $ 3,166,911
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 December 31, 2018 and 2017 : December 31, 2018 30-89 days past due 90 days or more and accruing interest Non-accrual loans Loans current on payments and accruing interest Purchased Credit Impaired loans Total Commercial and industrial $ 999 $ 65 $ 6,124 $ 858,447 $ 1,448 $ 867,083 Construction 109 — 283 549,904 5,755 556,051 Residential real estate: 1-to-4 family mortgage 4,919 737 2,704 528,078 19,377 555,815 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 2,423 484,481 6,016 493,524 Non-owner occupied 61 77 1,199 682,645 16,266 700,248 Consumer and other 1,987 1,008 148 205,573 20,137 228,853 Total $ 9,208 $ 3,041 $ 13,685 $ 3,572,578 $ 68,999 $ 3,667,511 December 31, 2017 30-89 days past due 90 days or more and accruing interest Non-accrual loans Loans current on payments and accruing interest Purchased Credit Impaired loans Total Commercial and industrial $ 5,859 $ 90 $ 533 $ 706,449 $ 2,144 $ 715,075 Construction 1,412 241 300 438,645 7,728 448,326 Residential real estate: 1-to-4 family mortgage 4,678 956 2,548 449,309 23,498 480,989 Residential line of credit 527 134 699 193,626 — 194,986 Multi-family mortgage — — — 62,354 20 62,374 Commercial real estate: Owner occupied 521 358 2,582 480,449 11,962 495,872 Non-owner occupied 121 — 1,371 531,932 18,164 551,588 Consumer and other 1,945 217 68 190,152 25,319 217,701 Total $ 15,063 $ 1,996 $ 8,101 $ 3,052,916 $ 88,835 $ 3,166,911
Impaired Loans Recognized, Segregated by Class	Impaired loans recognized in conformity with ASC 310 at December 31, 2018 and 2017 , segregated by class, were as follows: December 31, 2018 Recorded investment Unpaid principal Related allowance With a related allowance recorded: Commercial and industrial $ 618 $ 732 $ 3 Construction — — — Residential real estate: 1-to-4 family mortgage 145 145 7 Residential line of credit — — — Multi-family mortgage — — — Commercial real estate: Owner occupied 560 641 53 Non-owner occupied 5,686 5,686 205 Consumer and other — — — 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 — Multi-family mortgage — — — 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 December 31, 2017 Recorded investment Unpaid principal Related allowance With a related allowance recorded: Commercial and industrial $ 53 $ 53 $ 20 Construction — — — Residential real estate: 1-to-4 family mortgage 194 495 18 Residential line of credit — — — Multi-family mortgage — — — Commercial real estate: Owner occupied 844 1,123 120 Non-owner occupied 144 150 33 Consumer and other — — — Total $ 1,235 $ 1,821 $ 191 With no related allowance recorded: Commercial and industrial $ 1,526 $ 1,570 $ — Construction 1,289 1,313 — Residential real estate: 1-to-4 family mortgage 1,068 1,072 — Residential line of credit — — — Multi-family mortgage 978 978 — Commercial real estate: Owner occupied 1,676 2,168 — Non-owner occupied 1,576 2,325 — Consumer and other 25 25 — Total $ 8,138 $ 9,451 $ — Total impaired loans $ 9,373 $ 11,272 $ 191 December 31, 2018 2017 2016 Average recorded investment Interest income recognized (cash basis) Average recorded investment Interest income recognized (cash basis) Average recorded investment Interest income recognized (cash basis) With a related allowance recorded: Commercial and industrial $ 335 $ 121 $ 454 $ 2 $ 994 $ 17 Construction — — — — 154 — Residential real estate: 1-to-4 family mortgage 170 9 149 9 1,750 1 Residential line of credit — — — — — — Multi-family mortgage — — — — — — Commercial real estate: Owner occupied 702 43 740 48 1,756 25 Non-owner occupied 2,915 2 648 5 1,777 — Consumer and other — — 1 — 1 — Total $ 4,122 $ 175 $ 1,992 $ 64 $ 6,432 $ 43 With no related allowance recorded Commercial and industrial $ 1,377 $ 70 $ 1,074 $ 38 $ 494 $ 20 Construction 1,255 74 1,988 46 2,622 132 Residential real estate: 1-to-4 family mortgage 955 74 1,718 63 1,329 137 Residential line of credit 123 15 156 — 156 10 Multi-family mortgage 489 26 1,003 46 1,051 37 Commercial real estate: Owner occupied 1,862 148 1,897 122 1,120 119 Non-owner occupied 1,313 7 1,313 19 1,050 — Consumer and other 49 4 26 1 13 — Total $ 7,423 $ 418 $ 9,175 $ 335 $ 7,835 $ 455 Total impaired loans $ 11,545 $ 593 $ 11,167 $ 399 $ 14,267 $ 498
Financial Effect of TDRs	The following tables present the financial effect of TDRs recorded during the periods indicated: Year Ended December 31, 2018 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial and industrial 2 $ 887 $ 887 $ — Commercial real estate: Owner occupied 1 143 143 — Residential real estate: 1-to-4 family mortgage 1 249 249 — Consumer and other 5 61 61 — Total 9 $ 1,340 $ 1,340 $ — Year Ended December 31, 2017 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial and industrial 2 $ 627 $ 627 $ — Commercial real estate: Owner occupied 1 377 377 — Non-owner occupied 2 711 711 68 Residential real estate: 1-4 family mortgage 1 143 143 8 Consumer and other 1 25 25 — Total 7 $ 1,883 $ 1,883 $ 76 Year Ended December 31, 2016 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial real estate: Owner occupied 1 $ 118 $ 118 — Residential real estate: 1-4 family mortgage 5 1,819 1,819 — Consumer and other 3 29 29 — Total 9 $ 1,966 $ 1,966 $ —

Premises and equipment (Tables)

Premises and equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Schedule of Premises and Equipment and Related Accumulated Depreciation	Premises and equipment and related accumulated depreciation as of December 31, 2018 and 2017 , are as follows: 2018 2017 Land $ 25,821 $ 22,108 Premises 60,995 57,719 Furniture and fixtures 23,220 22,292 Leasehold improvements 11,819 10,740 Equipment 13,774 12,525 Construction in process 869 1,496 136,498 126,880 Less: accumulated depreciation (49,616 ) (45,303 ) Total Premises and Equipment $ 86,882 $ 81,577

Other real estate owned (Tables

Other real estate owned (Tables)	12 Months Ended
	Dec. 31, 2018
Real Estate [Abstract]
Summary of Other Real Estate Owned	The following table summarizes the other real estate owned for the years ended December 31, 2018 , 2017 and 2016 : Year Ended 2018 2017 2016 Balance at beginning of period $ 16,442 $ 7,403 $ 11,641 Transfers from loans 2,138 3,605 2,724 Transfers from premises and equipment — 3,466 — Acquired through merger or acquisition — 6,888 — Properties sold (4,819 ) (5,438 ) (6,696 ) Gain on sale of other real estate owned 271 1,080 1,670 Transferred to loans (1,019 ) (256 ) (1,548 ) Write-downs and partial liquidations (370 ) (306 ) (388 ) Balance at end of period $ 12,643 $ 16,442 $ 7,403

Goodwill and intangible assets

Goodwill and intangible assets (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Core Deposit and Other Intangibles	Core deposit and other intangibles are as follows as of the indicated dates: Core deposit and other intangibles Gross Carrying Amount Accumulated Amortization Net Carrying Amount December 31, 2018 Core deposit intangible $ 38,915 $ (29,901 ) $ 9,014 Leasehold intangible 587 (127 ) 460 Customer base trust intangible 1,600 (227 ) 1,373 Manufactured housing servicing intangible 1,088 (307 ) 781 Total core deposit and other intangibles $ 42,190 $ (30,562 ) $ 11,628 December 31, 2017 Core deposit intangible $ 38,915 $ (27,121 ) $ 11,794 Leasehold intangible 587 (38 ) 549 Customer base trust intangible 1,600 (67 ) 1,533 Manufactured housing servicing intangible 1,088 (62 ) 1,026 Total core deposit and other intangibles $ 42,190 $ (27,288 ) $ 14,902
Schedule of Estimated Aggregate Amortization Expense of Core Deposit and Other Intangibles	The estimated aggregate amortization expense of core deposit and other intangibles for each of the next five years and thereafter is as follows: December 31, 2019 $ 2,862 December 31, 2020 2,476 December 31, 2021 2,090 December 31, 2022 1,614 December 31, 2023 1,101 Thereafter 1,485 $ 11,628

Mortgage servicing rights (Tabl

Mortgage servicing rights (Tables)	12 Months Ended
	Dec. 31, 2018
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 years ended December 31, 2018 , 2017 and 2016 : Year Ended December 31, 2018 2017 2016 Carrying value prior to policy change $ 76,107 $ 32,070 $ 29,711 Fair value impact of change in accounting policy (See Note 1) — 1,011 — Carrying value at beginning of period 76,107 33,081 29,711 Capitalization 54,913 58,984 46,070 Amortization — — (8,321 ) Sales (39,428 ) (11,686 ) (34,118 ) (Loss) gain on sale — (249 ) 3,406 Impairment — — (4,678 ) Change in fair value: Due to pay-offs/pay-downs (11,062 ) (3,104 ) — Due to change in valuation inputs or assumptions 8,299 (919 ) — Carrying value at December 31 $ 88,829 $ 76,107 $ 32,070
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 years ended December 31, 2018 , 2017 and 2016 , respectively: Year Ended December 31, 2018 2017 2016 Servicing income: Servicing income $ 20,591 $ 13,168 $ 12,063 Change in fair value of mortgage servicing rights (2,763 ) (4,023 ) — Change in fair value of derivative hedging instruments (5,910 ) 599 — Total servicing income 11,918 9,744 12,063 Servicing expenses: Servicing asset amortization — — 8,321 Servicing asset impairment — — 4,678 Loss on sale of mortgage servicing rights, related hedges and transaction costs on sale — 249 4,447 Other servicing expenses 7,675 4,896 2,325 Total servicing expenses 7,675 5,145 19,771 Net servicing income (loss) $ 4,243 $ 4,599 $ (7,708 )
Schedule of Data and Key Economic Assumptions Related to Mortgage Servicing Rights	Data and key economic assumptions related to the Company’s mortgage servicing rights as of December 31, 2018 and 2017 are as follows: As of December 31, 2018 2017 Unpaid principal balance $ 6,755,114 $ 6,529,431 Weighted-average prepayment speed (CPR) 8.58 % 8.90 % Estimated impact on fair value of a 10% increase (2,072 ) (3,026 ) Estimated impact on fair value of a 20% increase (4,006 ) (5,855 ) Discount rate 10.45 % 9.75 % Estimated impact on fair value of a 100 bp increase (2,505 ) (3,052 ) Estimated impact on fair value of a 200 bp increase (4,807 ) (5,867 ) Weighted-average coupon interest rate 4.21 % 3.94 % Weighted-average servicing fee (basis points) 30 28 Weighted-average remaining maturity (in months) 325 335

Other assets and other liabil_2

Other assets and other liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Other Assets And Other Liabilities [Abstract]
Summary of Other Assets	Included in other assets are: As of December 31, Other assets 2018 2017 Cash surrender value on bank owned life insurance $ 11,115 $ 10,873 Prepaid expenses 3,283 2,477 Software 1,313 1,962 Mortgage lending receivable 3,876 3,703 Derivatives (See Note 16) 14,316 9,690 FHLB lender risk account receivable (See Note 1) 5,225 — Other assets 30,974 15,511 Total other assets $ 70,102 $ 44,216
Summary of Other Liabilities	Included in other liabilities are: As of December 31, Other liabilities 2018 2017 Deferred compensation $ 3,836 $ 5,301 Accrued payroll 8,026 11,018 Mortgage servicing escrows 4,441 3,341 Mortgage buyback reserve 3,273 3,386 Accrued interest 5,015 1,504 Derivatives (See Note 16) 11,637 1,699 Deferred tax liability (See Note 13) 16,663 11,858 Right to repurchase GNMA loans serviced (See Note 1) — 43,035 FHLB lender risk account guaranty 2,646 — Other liabilities 9,877 37,852 Total other liabilities $ 65,414 $ 118,994

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2018
Banking and Thrift [Abstract]
Schedule of Maturities of Time Deposits	At December 31, 2018 , the scheduled maturities of time deposits are as follows: Scheduled maturities of time deposits Due on or before: December 31, 2019 $ 755,870 December 31, 2020 220,751 December 31, 2021 60,928 December 31, 2022 16,887 December 31, 2023 64,811 Thereafter 498 Total $ 1,119,745

Borrowings Borrowings (Tables)

Borrowings Borrowings (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Summary of Balances for Securities Sold Under Agreements to Repurchase	2018 2017 Balance at year end $ 15,081 $ 14,293 Average daily balance during the year 16,128 16,326 Average interest rate during the year 0.28 % 0.17 % Maximum month-end balance during the year 19,651 19,432 Weighted average interest rate at year-end 0.74 % 0.16 %
Maturities of FHLB Advances	Maturities of FHLB advances as of December 31, 2018 are as follows: FHLB advances Due on or before: December 31, 2019 $ 180,060 December 31, December 31, 2020 59 December 31, December 31, 2021 283 December 31, December 31, 2022 692 December 31, December 31, 2023 124 Due thereafter 547 Total $ 181,765

Income taxes (Tables)

Income taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Allocation of Federal and State Income Taxes between Current and Deferred Portions	Allocation of federal and state income taxes between current and deferred portions is as follows: For the year ended December 31, 2018 2017 2016 Current $ 19,259 $ 14,629 $ 12,476 Deferred 6,359 6,458 9,257 Total $ 25,618 $ 21,087 $ 21,733
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 rates of 21% for the year ended December 31, 2018 and 35% for the years ended December 31, 2017 and 2016 due to the following: For the year ended December 31, 2018 2017 2016 Federal taxes calculated at statutory rate $ 22,230 21.0 % $ 25,720 35.0 % $ 5,061 8.1 % Increase (decrease) resulting from: State taxes, net of federal benefit 4,666 4.4 % 3,053 4.2 % 3,664 5.9 % Revaluation of net deferred tax liability as a result of the Tax Cuts and Jobs Act — — % (5,894 ) (8.0 )% — — % Conversion as of September 16, 2016 to C Corporation — — % — — % 13,181 21.1 % Benefit of equity based compensation (870 ) (0.8 )% (310 ) (0.4 )% (786 ) (1.3 )% Municipal interest income, net of interest disallowance (837 ) (0.8 )% (1,402 ) (1.9 )% (633 ) (1.0 )% Bank owned life insurance (51 ) — % (85 ) (0.2 )% (24 ) — % Stock offering costs 141 0.1 % — — % — — % Other 339 0.3 % 5 — % 1,270 2.1 % Income tax expense, as reported $ 25,618 24.2 % $ 21,087 28.7 % $ 21,733 34.9 %
Schedule of Net Deferred Tax liability	The components of the net deferred tax liability at December 31, 2018 and 2017 , are as follows: December 31, 2018 2017 Deferred tax assets: Allowance for loan losses $ 7,539 $ 6,264 Amortization of core deposit intangible 1,012 759 Deferred compensation 5,878 6,158 Unrealized loss on available-for-sale debt securities 3,299 988 Other 1,998 3,599 Subtotal 19,726 17,768 Deferred tax liabilities: FHLB stock dividends (550 ) (550 ) Depreciation (4,812 ) (4,115 ) Cash flow hedges (736 ) — Mortgage servicing rights (23,146 ) (19,830 ) Other (7,145 ) (5,131 ) Subtotal (36,389 ) (29,626 ) Net deferred tax liability $ (16,663 ) $ (11,858 )

Commitments and contingencies (

Commitments and contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
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. December 31, 2018 2017 Commitments to extend credit, excluding interest rate lock commitments $ 1,032,390 $ 977,276 Letters of credit 19,024 22,882 Balance at end of period $ 1,051,414 $ 1,000,158
Summary of Commitments Under Non-Cancelable Operating Leases	Commitments under non-cancelable operating leases were as follows, before considering renewal options that generally are present: 2019 $ 4,328 2020 3,780 2021 3,548 2022 2,542 2023 1,613 Thereafter 6,250 Total $ 22,061
Summary of Allowance for Loan Repurchases or Indemnifications	The following table summarizes the activity in the repurchase reserve: For the year ended 2018 2017 2016 Balance at beginning of period $ 3,386 $ 2,659 $ 2,156 Provision for loan repurchases or indemnifications 174 810 512 Recoveries on previous losses 3 — 9 Losses on loans repurchased or indemnified (290 ) (83 ) (18 ) Balance at end of period $ 3,273 $ 3,386 $ 2,659

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2018
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: 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 — Option contracts 3,800 26 — Total $ 1,258,047 $ 13,595 $ 11,637 December 31, 2017 Notional Amount Asset Liability Not designated as hedging: Interest rate contracts $ 146,754 $ 1,146 $ 1,146 Forward commitments 870,574 — 553 Interest rate-lock commitments 504,156 6,768 — Futures contracts 283,000 315 — Options contracts 6,000 29 — Total $ 1,810,484 $ 8,258 $ 1,699 December 31, 2018 Notional Amount Asset Liability Designated as hedging: Interest rate swaps $ 30,000 $ 721 $ — Total $ 30,000 $ 721 $ — December 31, 2017 Notional Amount Asset Liability Designated as hedging: Interest rate swaps $ 130,000 $ 1,432 — Total $ 130,000 $ 1,432 —
Schedule of Gains (Losses) Included in the Consolidated Statements of Income Related to Derivative Financial Instruments	Gains (losses) included in the Consolidated Statements of Income related to the Company’s derivative financial instruments were as follows: Year Ended December 31, 2018 2017 2016 Not designated as hedging instruments (included in mortgage banking income): Interest rate lock commitments $ (527 ) $ 340 $ 835 Forward commitments 3,864 (11,987 ) 10,497 Futures contracts (2,981 ) 315 — Option contracts (58 ) 22 — Total $ 298 $ (11,310 ) $ 11,332 Year Ended December 31, 2018 2017 2016 Designated as hedging: Amount of gain reclassified from other comprehensive income and recognized in interest expense on borrowings $ 128 $ — $ — Gain (loss) included in interest expense on borrowings 32 (168 ) — Included in loss on sale of mortgage servicing rights — — (5,569 ) Total $ 160 $ (168 ) $ (5,569 ) 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: Year Ended December 31, 2018 2017 2016 Designated as hedging: Amount of gain recognized in other comprehensive income, net of tax $ 1,039 $ 685 $ —

Fair value of financial instr_2

Fair value of financial instruments (Tables)	12 Months Ended
	Dec. 31, 2018
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. Due to the adoption of ASU 2016-01 as of January 1, 2018, the fair value as presented below is measured using the exit price notion in the periods after adoption and may not be comparable with prior periods presented as a result of the change in methodology. 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 Fair Value December 31, 2017 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 119,751 $ 119,751 $ — $ — $ 119,751 Investment securities 543,992 — 540,388 3,604 543,992 Federal Home Loan Bank Stock 11,412 N/A N/A N/A N/A Loans, net 3,142,870 — 3,064,373 77,027 3,141,400 Loans held for sale 526,185 — 526,185 — 526,185 Interest receivable 13,069 — 13,069 — 13,069 Mortgage servicing rights 76,107 — — 76,107 76,107 Derivatives 9,690 — 9,690 — 9,690 Financial liabilities: Deposits: Without stated maturities $ 2,976,066 $ 2,976,066 $ — $ — $ 2,976,066 With stated maturities 688,329 — 682,403 — 682,403 Securities sold under agreement to 14,293 14,293 — — 14,293 Federal Home Loan Bank advances 302,372 190,000 112,465 — 302,465 Subordinated debt 30,930 — 36,670 — 36,670 Interest payable 1,504 575 929 — 1,504 Derivatives 1,699 — 1,699 — 1,699
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: 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 December 31, 2017 are presented in the following table: At December 31, 2017 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 $ — $ 986 $ — $ 986 Mortgage-backed securities — 418,781 — 418,781 Municipals, tax-exempt — 109,251 — 109,251 Treasury securities — 7,252 — 7,252 Equity securities — 4,118 3,604 7,722 Total $ — $ 540,388 $ 3,604 $ 543,992 Loans held for sale — 526,185 — 526,185 Mortgage servicing rights — — 76,107 76,107 Derivatives — 9,690 — 9,690 Financial Liabilities: Derivatives — 1,699 — 1,699
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, 2017 are presented in the following table: At December 31, 2017 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 $ — $ — $ 13,174 $ 13,174 Impaired Loans (1) : Commercial and industrial — — 1,971 1,971 Construction — — 4,211 4,211 Residential real estate: 1-4 family mortgage — — 21,902 21,902 Commercial real estate: Owner occupied — — 10,030 10,030 Non-owner occupied — — 13,593 13,593 Consumer and other — — 25,320 25,320 Total $ — $ — $ 77,027 $ 77,027 (1) Includes both impaired non-purchased loans and PCI loans. 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 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 year ended December 31, 2018 and 2017 : Available-for-sale securities Year Ended December 31, 2018 2017 Balance at beginning of period $ 3,604 $ 4,549 Reclassification of equity securities without a readily determinable fair value to other assets (1) (3,604 ) — Impairment of equity securities — (945 ) Balance at end of period $ — $ 3,604 (1) See Note 1, "Basis of Presentation" in the Notes to the consolidated financial statements for additional details regarding the adoption of ASU 2016-01, Recognition and Measurement of Financial Assets and Liabilities.
Information About Significant Unobservable Inputs (Level 3) Used in Valuation of Assets Measured at Fair Value on Nonrecurring Basis	The following table presents information as of December 31, 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 PCI loans. The following table presents information as of December 31, 2017 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) $ 77,027 Valuation of collateral Discount for comparable sales 0%-30% Other real estate owned $ 13,174 Appraised value of property less costs to sell Discount for costs to sell 0%-15% (1) Includes both impaired non-purchased loans and 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 December 31, 2018 and 2017 : December 31, 2018 Aggregate fair value Aggregate Unpaid Principal Balance Difference 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 — December 31, 2017 Mortgage loans held for sale measured at fair value $ 482,089 $ 467,039 $ 15,050 Past due loans of 90 days or more 320 320 — Nonaccrual loans 741 741 —

Parent company only financial_2

Parent company only financial statements (Tables)	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Balance Sheet	As of December 31, Balance sheet 2018 2017 Assets Cash and cash equivalents (1) $ 17,400 $ 25,789 Investments — 1,129 Investments in Bank subsidiary (1) 679,097 595,625 Other assets 7,364 5,411 Goodwill 29 29 Total assets 703,890 627,983 Liabilities and shareholders' equity Liabilities Borrowings $ 30,930 $ 30,930 Accrued expenses and other liabilities 1,103 324 Total liabilities 32,033 31,254 Shareholders' equity Common stock 30,725 30,536 Additional paid-in capital 424,146 418,596 Retained earnings 221,213 147,449 Accumulated other comprehensive (loss) income (4,227 ) 148 Total shareholders' equity 671,857 596,729 Total liabilities and shareholders' equity $ 703,890 $ 627,983 (1) Eliminates in Consolidation
Income Statements	For the years ended For the Year Ended December 31, Income Statements 2018 2017 2016 Income Other interest income $ — $ 41 $ 33 Interest income from Bank subsidiary (1) — — 95 (Loss) gain on investments — (945 ) 417 Gain on sale of other assets 297 — — Dividend income from Bank subsidiary (1) — — 14,875 Earnings from Bank subsidiary (1) 83,285 54,713 26,859 Total income 83,582 53,809 42,279 Expenses Interest expense 1,651 1,491 1,393 Salaries, legal and professional fees 1,481 893 315 Other noninterest expense 960 296 168 Federal and state income tax benefit (746 ) (1,269 ) (188 ) Total expenses 3,346 1,411 1,688 Net income $ 80,236 $ 52,398 $ 40,591 (1) Eliminates in Consolidation
Statement of Cash Flows	For the years ended For the Year Ended December 31, Statement of Cash Flows 2018 2017 2016 Operating Activities Net income $ 80,236 $ 52,398 $ 40,591 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed income of subsidiary bank (83,285 ) (54,713 ) (26,859 ) Loss (gain) on investments — 945 (417 ) Gain on sale of other assets (297 ) Stock-based compensation expense 7,207 — 4,693 Increase in other assets (441 ) (2,439 ) (427 ) Increase (decrease) in other liabilities (7,737 ) (551 ) (5,251 ) Other, net — — 7 Net cash provided by operating activities (4,317 ) (4,360 ) 12,337 Investing Activities Proceeds from sale of other assets 869 — — Other investments — — 724 Net cash provided by investing activities 869 — 724 Financing Activities Equity contribution to Bank — (154,200 ) (20,000 ) Payment of dividends (6,137 ) — (69,300 ) Payment of borrowings — — (10,075 ) Net proceeds from sale of common stock 1,196 153,356 116,054 Net cash (used in) provided by financing activities (4,941 ) (844 ) 16,679 Net (decrease) increase in cash and cash equivalents (8,389 ) (5,204 ) 29,740 Cash and cash equivalents at beginning of year 25,789 30,993 1,253 Cash and cash equivalents at end of year $ 17,400 $ 25,789 $ 30,993 Supplemental noncash disclosures: Dividends declared not paid on restricted stock units $ (226 ) $ — $ — Noncash dividend from Bank 572 — — Conversion of cash-settled to stock-settled compensation — — 5,388 Forgiveness of intercompany debt — — 6,024

Segment reporting (Tables)

Segment reporting (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Schedule of Segment Financial Information	The following tables provides segment financial information for the years ended December 31, 2018 , 2017 and 2016 as follows: Year Ended December 31, 2018 Banking Mortgage Consolidated Net interest income $ 204,517 $ (449 ) $ 204,068 Provision for loan loss 5,398 — 5,398 Mortgage banking income 25,460 83,874 109,334 Change in fair value of mortgage servicing rights (1) — (8,673 ) (8,673 ) Other noninterest income 29,981 — 29,981 Depreciation 3,827 507 4,334 Amortization of intangibles 3,185 — 3,185 Other noninterest mortgage banking expense 21,671 73,068 94,739 Other noninterest expense (2) 121,200 — 121,200 Income before income taxes 104,677 1,177 105,854 Income tax expense 25,618 Net income 80,236 Total assets $ 4,752,111 $ 384,653 $ 5,136,764 Goodwill 137,090 100 137,190 (1) Included in mortgage banking income. (2) Included $1,594 in merger and conversion expenses. Year Ended December 31, 2017 Banking Mortgage Consolidated Net interest income $ 153,018 $ 253 $ 153,271 Provision for loan loss (950 ) — (950 ) Mortgage banking income 26,737 93,620 120,357 Change in fair value of mortgage servicing rights (1) — (3,424 ) (3,424 ) Other noninterest income 24,648 — 24,648 Depreciation and amortization 3,801 515 4,316 Amortization of intangibles 1,995 — 1,995 Loss on sale of mortgage servicing rights — 249 249 Other noninterest mortgage banking expense 21,714 76,582 98,296 Other noninterest expense (2) 117,461 — 117,461 Income before income taxes 60,382 13,103 73,485 Income tax expense 21,087 Net income 52,398 Total assets $ 4,130,349 $ 597,364 $ 4,727,713 Goodwill 137,090 100 137,190 (1) Included in mortgage banking income. (2) Included $19,034 in merger and conversion expenses. Year Ended December 31, 2016 Banking Mortgage Consolidated Net interest income $ 112,365 $ (1,415 ) $ 110,950 Provision for loan loss (1,479 ) — (1,479 ) Mortgage banking income 25,542 92,209 117,751 Other noninterest income 26,934 — 26,934 Depreciation and amortization 3,506 489 3,995 Amortization of intangibles 2,132 — 2,132 Amortization and impairment of mortgage servicing rights — 12,999 12,999 Loss on sale of mortgage servicing rights — 4,447 4,447 Other noninterest mortgage banking expense 16,095 66,256 82,351 Other noninterest expense (1) 88,866 — 88,866 Income before income taxes 55,721 6,603 62,324 Income tax expense 21,733 Net income 40,591 Total assets $ 2,752,773 $ 524,108 $ 3,276,881 Goodwill 46,767 100 46,867 (1) Included $3,268 in merger and conversion expenses.

Minimum capital requirements (T

Minimum capital requirements (Tables)	12 Months Ended
	Dec. 31, 2018
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 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 % 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, 2017 Total Capital (to risk-weighted assets) FB Financial Corporation $ 496,422 12.0 % $ 330,672 8.0 % $ 382,340 9.3 % N/A N/A FirstBank 466,102 11.3 % 329,984 8.0 % 381,544 9.3 % $ 412,480 10.0 % Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 472,381 11.4 % $ 247,969 6.0 % $ 299,629 7.3 % N/A N/A FirstBank 442,061 10.7 % 247,422 6.0 % 298,968 7.3 % $ 329,896 8.0 % Tier 1 Capital (to average assets) FB Financial Corporation $ 472,381 10.5 % $ 180,643 4.0 % N/A N/A N/A N/A FirstBank 442,061 9.8 % 180,987 4.0 % N/A N/A $ 226,234 5.0 % Common Equity Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 442,381 10.7 % $ 185,874 4.5 % $ 237,506 5.8 % N/A N/A FirstBank 442,061 10.7 % 185,567 4.5 % 237,113 5.8 % $ 268,041 6.5 %

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
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 December 31, 2018: For the year ended December 31, 2018 Restricted Stock Units Outstanding Weighted Average Grant Date Fair Value Balance at beginning of period 1,214,109 $ 19.97 Conversion of deferred compensation plan — — Conversion of equity based incentive (EBI) plans — — Grants 149,734 39.55 Released and distributed (vested) (207,478 ) 21.99 Forfeited/expired (16,150 ) 25.45 Balance at end of period 1,140,215 $ 21.96

Related party transactions (Tab

Related party transactions (Tables)	12 Months Ended
	Dec. 31, 2018
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 follows: Loans outstanding at January 1, 2018 $ 21,012 New loans and advances 21,828 Repayments (10,576 ) Loans outstanding at December 31, 2018 $ 32,264

Basis of presentation - Additio

Basis of presentation - Additional Information (Details)	Nov. 14, 2018branch	May 26, 2017USD ($)$ / sharesshares	Sep. 15, 2016USD ($)$ / sharesshares	Jun. 28, 2016shares	Mar. 31, 2019	Jun. 30, 2018shares	Dec. 31, 2018USD ($)branchMethodshares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)	Jan. 01, 2018USD ($)	Jul. 31, 2016shares	Jun. 30, 2016shares
Class of Stock [Line Items]
Number of full-service branches | branch							56
Stock split ratio				100
Common stock, shares issued (in shares) | shares							30,724,532	30,535,517
Common stock, shares authorized (in shares) | shares							75,000,000	75,000,000			75,000,000	25,000,000
Proceeds from issuance of common stock, net of offering costs							$ 1,196,000	$ 153,356,000	$ 116,054,000
Effective tax rate, percent							24.20%	28.70%	34.90%
OTTI on available for sale securities							$ 0	$ 0	$ 0
Other than temporary impairment							0	945,000	0
Transfers from loans to loans held for sale							11,888,000	0	0
Adjustments for transfers to loans HFS							$ 349,000
Percent of remaining principal allowed to buy back under GNMA optional repurchase programs							100.00%
Deposits with Federal Home Loan Banks							$ 5,225,000	0
Loans individually evaluated for impairment							13,716,000	9,373,000	12,951,000
Loans collectively evaluated for impairment							3,584,796,000	3,068,703,000	1,819,775,000
Impairment losses on mortgage servicing rights							0	0	4,678,000
Goodwill impairment loss							0	0	0
Deferred tax liability increased due to change in taxable status							0	0	13,181,000
Interest and penalties on uncertain tax positions							0	0	0
Impairment of long-lived assets							$ 0	0
Number of methods to deliver mortgage loans | Method							2
Advertising costs							$ 13,139,000	12,957,000	10,608,000
Adoption of ASU 2016-01 (See Note 1)										$ 0
ASC 860-50-35, Transfers and Servicing
Class of Stock [Line Items]
Adjustment to retained earnings								615,000
ASU 2018-02
Class of Stock [Line Items]
Reclassification from accumulated other comprehensive income to retained earnings										652,000
Premises
Class of Stock [Line Items]
Property, plant and equipment, useful life							40 years
Residential Mortgage Loans
Class of Stock [Line Items]
Residential mortgage loans transferred by bank							$ 14,732,000	11,706,000	17,963,000
Mortgage Loans
Class of Stock [Line Items]
Net (losses) gains from fair value changes of mortgage loans							(4,539,000)	9,111,000	(2,289,000)
GNMA
Class of Stock [Line Items]
Residential mortgage loans transferred by bank							0	43,035,000
Transfers from loans to loans held for sale							0	$ 43,035,000	$ 0
Delinquent GNMA loans that had been previously sold							67,362,000
Pro forma
Class of Stock [Line Items]
Effective tax rate, percent									36.75%
Initial Public Offering
Class of Stock [Line Items]
Common stock sold and issued, shares (in shares) | shares			6,764,704
Common stock sold and issued, price per share (USD per share) | $ / shares			$ 19
Proceeds from issuance of common stock, net of offering costs			$ 115,525,000
Distribution to majority shareholder from net proceeds			55,000,000
Repayments of aggregate principal amount of subordinated notes from net proceeds			$ 10,075,000
Placement agent and other offering costs							$ 671,000
Private Placement
Class of Stock [Line Items]
Common stock sold and issued, shares (in shares) | shares		4,806,710
Common stock sold and issued, price per share (USD per share) | $ / shares		$ 33
Proceeds from issuance of common stock, net of offering costs		$ 152,721,000
Placement agent and other offering costs		$ 5,901,000
Secondary Public Offering
Class of Stock [Line Items]
Common stock sold and issued, shares (in shares) | shares						3,680,000
Minimum
Class of Stock [Line Items]
Common stock, shares issued (in shares) | shares				171,800
Common stock, shares authorized (in shares) | shares				250,000
Minimum | Furniture and fixtures
Class of Stock [Line Items]
Property, plant and equipment, useful life							7 years
Minimum | Equipment
Class of Stock [Line Items]
Property, plant and equipment, useful life							3 years
Minimum | Commercial and Commercial Real Estate Loans
Class of Stock [Line Items]
Loans individually evaluated for impairment							$ 250,000
Minimum | Scenario, Forecast | Accounting Standards Update 2016-02
Class of Stock [Line Items]
Increase in assets as a result of new accounting guidance, percent					0.40%
Maximum
Class of Stock [Line Items]
Common stock, shares issued (in shares) | shares				17,180,000
Common stock, shares authorized (in shares) | shares				25,000,000
Maximum | Furniture and fixtures
Class of Stock [Line Items]
Property, plant and equipment, useful life							10 years
Maximum | Leasehold improvements
Class of Stock [Line Items]
Property, plant and equipment, useful life							20 years
Maximum | Equipment
Class of Stock [Line Items]
Property, plant and equipment, useful life							7 years
Maximum | Commercial and Commercial Real Estate Loans
Class of Stock [Line Items]
Loans collectively evaluated for impairment							$ 250,000
Maximum | Scenario, Forecast | Accounting Standards Update 2016-02
Class of Stock [Line Items]
Increase in assets as a result of new accounting guidance, percent					0.80%
Retained earnings
Class of Stock [Line Items]
Adoption of ASU 2016-01 (See Note 1)										(109,000)
Retained earnings | Accounting Standards Update 2016-01
Class of Stock [Line Items]
Adoption of ASU 2016-01 (See Note 1)										$ 109,000
Federal Home Loan Bank of Cincinnati
Class of Stock [Line Items]
Deposits with Federal Home Loan Banks							$ 5,225,000
Atlantic Capital Bank | TENNESSEE
Class of Stock [Line Items]
Number of branches acquired | branch	11
Atlantic Capital Bank | GEORGIA
Class of Stock [Line Items]
Number of branches acquired | branch	3

Basis of presentation - Schedul

Basis of presentation - Schedule of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic earnings per common share calculation:
Net income	$ 80,236	$ 52,398	$ 40,591
Dividends paid on and undistributed earnings allocated to participating securities	(428)	0	0
Earnings attributable to common shareholders	$ 79,808	$ 52,398	$ 40,591
Weighted-average basic shares outstanding (in shares)	30,675,755	27,627,228	19,165,182
Basic earnings per share (in dollars per share)	$ 2.60	$ 1.90	$ 2.12
Diluted earnings per common share:
Earnings attributable to common shareholders	$ 79,808	$ 52,398	$ 40,591
Weighted-average basic shares outstanding (in shares)	30,675,755	27,627,228	19,165,182
Weighted-average diluted shares contingently issuable (in shares)	639,226	580,374	146,992
Weighted-average diluted shares outstanding (in shares)	31,314,981	28,207,602	19,312,174
Diluted earnings per share (in dollars per share)	$ 2.55	$ 1.86	$ 2.10
Pro Forma, Earnings Attributable To Common Shareholders	$ 79,808	$ 52,398	$ 39,422
Pro forma earnings per share:
Weighted-average basic shares outstanding, pro-forma (in shares)	30,675,755	27,627,228	19,165,182
Pro forma basic earnings per share (in dollars per share)	$ 2.60	$ 1.90	$ 2.06
Pro forma diluted earnings per share:
Pro forma net income	$ 80,236	$ 52,398	$ 39,422
Weighted-average diluted shares outstanding, pro forma (in shares)	31,314,981	28,207,602	19,312,174
Pro forma diluted earnings per share (in dollars per share)	$ 2.55	$ 1.86	$ 2.04

Mergers and acquisitions - Atla

Mergers and acquisitions - Atlantic Capital Bank Narrative (Details) $ in Thousands	Nov. 14, 2018USD ($)branch	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Merger related expenses		$ 1,594	$ 19,034	$ 3,268
Atlantic Capital Bank
Business Acquisition [Line Items]
Deposits assumed in acquisition	$ 602,000
Loans	$ 381,000
Percent of book value for acquired loans	99.32%
Deposit premium percentage	6.25%
Merger related expenses		$ 401
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 - Clay

Mergers and acquisitions - Clayton Bank and Trust and American City Bank Narrative (Details)	Feb. 08, 2017USD ($)shares	Jul. 31, 2017USD ($)bank_location	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Goodwill			$ 137,190,000	$ 137,190,000	$ 46,867,000
Merger and conversion			1,594,000	19,034,000	$ 3,268,000
Business combination, deferred taxes			19,726,000	17,768,000
Clayton Bank and Trust and American City Bank
Business Acquisition [Line Items]
Acquisition purchase price	$ 236,484,000	$ 236,484,000
Business acquisition, shares issued (in shares) | shares	1,521,200
Cash purchase price	$ 184,200,000	$ 184,200,000
Number of banking offices | bank_location		18
Goodwill		$ 90,323,000
Merger and conversion			$ 1,193,000	$ 19,034,000
Business combination, deferred taxes		$ 0

Mergers and acquisitions - Sche

Mergers and acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - Clayton Bank and Trust and American City Bank $ in Thousands	Jul. 31, 2017USD ($)
Assets
Cash and cash equivalents	$ 49,059
Investment securities	59,493
FHLB stock	3,409
Loans	1,059,728
Allowance for loan losses	0
Premises and equipment	18,866
Other real estate owned	6,888
Intangibles, net	12,334
Other assets	5,978
Total assets	1,215,755
Liabilities
Interest-bearing deposits	670,054
Non-interest bearing deposits	309,464
Borrowings	84,831
Accrued expenses and other liabilities	5,245
Total liabilities	1,069,594
Net assets acquired	$ 146,161

Mergers and acquisitions - Sc_2

Mergers and acquisitions - Schedule of Consideration Paid and Allocation of Purchase Price to Net Assets Acquired (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 08, 2017	Jul. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity consideration
Total equity consideration			$ 0	$ 52,284	$ 0
Preliminary allocation of consideration paid:
Goodwill			$ 137,190	$ 137,190	$ 46,867
Clayton Bank and Trust and American City Bank
Equity consideration
Common stock issued (in shares)	1,521,200
Price per share as of July 31, 2017 (in dollars per share)		$ 34.37
Total equity consideration		$ 52,284
Cash consideration	$ 184,200	184,200
Total consideration paid	$ 236,484	236,484
Preliminary allocation of consideration paid:
Fair value of net assets acquired including identifiable intangible assets		146,161
Goodwill		90,323
Total consideration paid		$ 236,484
Clayton Bank and Trust and American City Bank | Common stock
Equity consideration
Common stock issued (in shares)		1,521,200

Mergers and acquisitions - Busi

Mergers and acquisitions - Business Acquisition, Pro Forma Information (Details) - Clayton Bank and Trust and American City Bank - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Net interest income	$ 192,633	$ 171,383
Total revenues	336,404	322,045
Net income	$ 75,659	$ 64,608

Cash and cash equivalents con_2

Cash and cash equivalents concentrations Cash and cash equivalents concentrations - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Abstract]
Restricted cash	$ 10,184
Federal funds sold	$ 31,364	$ 66,127

Investment securities - Summary

Investment securities - Summary of Amortized Cost of Securities and Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Abstract]
Amortized cost	$ 668,033	$ 541,028
Gross unrealized gains	2,756
Gross unrealized losses	(15,091)
Available-for-sale debt securities, at fair value	655,698	536,270
Amortized cost		548,898
Gross unrealized gains		3,067
Gross unrealized losses		(7,973)
Fair Value		543,992
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost	1,000
Gross unrealized gains	0
Gross unrealized losses	(11)
Available-for-sale debt securities, at fair value	989
Amortized cost		999
Gross unrealized gains		0
Gross unrealized losses		(13)
Fair Value		986
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Amortized cost	520,654
Gross unrealized gains	1,191
Gross unrealized losses	(13,265)
Available-for-sale debt securities, at fair value	508,580
Amortized cost		425,557
Gross unrealized gains		374
Gross unrealized losses		(7,150)
Fair Value		418,781
Municipals, tax exempt
Debt Securities, Available-for-sale [Abstract]
Amortized cost	138,994
Gross unrealized gains	1,565
Gross unrealized losses	(1,672)
Available-for-sale debt securities, at fair value	138,887
Amortized cost		107,127
Gross unrealized gains		2,692
Gross unrealized losses		(568)
Fair Value		109,251
Treasury securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost	7,385
Gross unrealized gains	0
Gross unrealized losses	(143)
Available-for-sale debt securities, at fair value	$ 7,242
Amortized cost		7,345
Gross unrealized gains		0
Gross unrealized losses		(93)
Fair Value		7,252
Debt Securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost		541,028
Gross unrealized gains		3,066
Gross unrealized losses		(7,824)
Fair Value		536,270
Equity securities
Debt Securities, Available-for-sale [Abstract]
Amortized cost		7,870
Gross unrealized gains		1
Gross unrealized losses		(149)
Fair Value		$ 7,722

Investment securities - Narrati

Investment securities - Narrative (Details)	12 Months Ended
	Dec. 31, 2018USD ($)security	Dec. 31, 2017USD ($)security	Dec. 31, 2016USD ($)	Jan. 01, 2018USD ($)
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	$ 3,107,000	$ 7,722,000
Net losses on marketable equity securities	81,000
Equity securities without readily determinable fair value, amount reclassed				$ 3,604,000
Available-for-sale securities		548,898,000
Recognized gains on early call of available-for-sale securities	$ 1,000	$ 1,000
Number of securities in securities portfolio | security	360	294
Number of securities in securities portfolio, unrealized loss position | security	174	124
Other than temporary impairment	$ 0	$ 945,000	$ 0
Accounting Standards Update 2016-01
Debt and Equity Securities, FV-NI [Line Items]
Equity securities without readily determinable fair value, amount reclassed				$ 3,604,000
Collateral Pledged
Debt and Equity Securities, FV-NI [Line Items]
Securities pledged	326,215,000	337,604,000
Trade Date Payables
Debt and Equity Securities, FV-NI [Line Items]
Available-for-sale securities	$ 2,120,000	$ 348,000

Investment securities - Schedul

Investment securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized cost, due in one year or less	$ 15,883	$ 905
Amortized costs, due in one to five years	13,806	28,332
Amortized cost, due in five to ten years	18,539	19,218
Amortized cost, due in over ten years	99,151	67,016
Amortized cost, total	147,379	115,471
Mortgage-backed securities - residential, amortized cost	520,654	425,557
Amortized cost	668,033	541,028
Fair value, due in one year or less	16,028	925
Fair value, due in one to five years	13,740	28,878
Fair value, due in five to ten years	18,387	19,588
Fair value, due in over ten years	98,963	68,098
Fair value, total	147,118	117,489
Mortgage-backed securities - residential, fair value	508,580	418,781
Total debt securities, Fair value	655,698	$ 536,270
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Line Items]
Amortized cost	520,654
Total debt securities, Fair value	$ 508,580

Investment securities - Summa_2

Investment securities - Summary of Sales of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Sales	$ 2,742	$ 94,743	$ 271,148
Gross realized gains	8	1,277	4,755
Gross realized losses	$ 44	$ 48	$ 348

Investment securities - Sched_2

Investment securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value	$ 87,858
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	(844)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	369,343
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	(14,247)
Debt securities, available-for-sale, continuous unrealized loss position, fair value	457,201
Debt securities, available-for-sale, unrealized loss position, accumulated loss	(15,091)
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value		$ 122,217
Available-for-sale securities, continuous unrealized loss position, less than twelve months		(1,174)
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value		314,406
Available-for-sale securities, continuous unrealized loss position, twelve months or longer		(6,799)
Available-for-sale securities, continuous unrealized loss position, fair value		436,623
Available-for-sale securities, continuous unrealized loss position,		(7,973)
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
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	989
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	(11)
Debt securities, available-for-sale, continuous unrealized loss position, fair value	989
Debt securities, available-for-sale, unrealized loss position, accumulated loss	(11)
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value		0
Available-for-sale securities, continuous unrealized loss position, less than twelve months		0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value		986
Available-for-sale securities, continuous unrealized loss position, twelve months or longer		(13)
Available-for-sale securities, continuous unrealized loss position, fair value		986
Available-for-sale securities, continuous unrealized loss position,		(13)
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value	60,347
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	(478)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	335,769
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	(12,787)
Debt securities, available-for-sale, continuous unrealized loss position, fair value	396,116
Debt securities, available-for-sale, unrealized loss position, accumulated loss	(13,265)
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value		107,611
Available-for-sale securities, continuous unrealized loss position, less than twelve months		(980)
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value		290,258
Available-for-sale securities, continuous unrealized loss position, twelve months or longer		(6,170)
Available-for-sale securities, continuous unrealized loss position, fair value		397,869
Available-for-sale securities, continuous unrealized loss position,		(7,150)
Municipals, tax exempt
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value	27,511
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	(366)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	25,343
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	(1,306)
Debt securities, available-for-sale, continuous unrealized loss position, fair value	52,854
Debt securities, available-for-sale, unrealized loss position, accumulated loss	(1,672)
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value		7,354
Available-for-sale securities, continuous unrealized loss position, less than twelve months		(101)
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value		20,112
Available-for-sale securities, continuous unrealized loss position, twelve months or longer		(467)
Available-for-sale securities, continuous unrealized loss position, fair value		27,466
Available-for-sale securities, continuous unrealized loss position,		(568)
Treasury securities
Debt Securities, Available-for-sale [Abstract]
Debt securities, available-for-sale, unrealized loss, less than 12 months, fair value	0
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, accumulated loss	0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, fair value	7,242
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss	(143)
Debt securities, available-for-sale, continuous unrealized loss position, fair value	7,242
Debt securities, available-for-sale, unrealized loss position, accumulated loss	$ (143)
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value		7,252
Available-for-sale securities, continuous unrealized loss position, less than twelve months		(93)
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value		0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer		0
Available-for-sale securities, continuous unrealized loss position, fair value		7,252
Available-for-sale securities, continuous unrealized loss position,		(93)
Debt Securities
Debt Securities, Available-for-sale [Abstract]
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value		122,217
Available-for-sale securities, continuous unrealized loss position, less than twelve months		(1,174)
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value		311,356
Available-for-sale securities, continuous unrealized loss position, twelve months or longer		(6,650)
Available-for-sale securities, continuous unrealized loss position, fair value		433,573
Available-for-sale securities, continuous unrealized loss position,		(7,824)
Equity securities
Debt Securities, Available-for-sale [Abstract]
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value		0
Available-for-sale securities, continuous unrealized loss position, less than twelve months		0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value		3,050
Available-for-sale securities, continuous unrealized loss position, twelve months or longer		(149)
Available-for-sale securities, continuous unrealized loss position, fair value		3,050
Available-for-sale securities, continuous unrealized loss position,		$ (149)

Loans and allowance for loan _3

Loans and allowance for loan losses- Loans Outstanding by Major Lending Classification (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	$ 3,667,511	$ 3,166,911
Less: Allowance for loan losses	(28,932)	(24,041)	$ (21,747)	$ (24,460)
Net loans	3,638,579	3,142,870
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	867,083	715,075
Less: Allowance for loan losses	(5,348)	(4,461)	(5,309)	(5,135)
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	556,051	448,326
Less: Allowance for loan losses	(9,729)	(7,135)	(4,940)	(5,143)
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	555,815	480,989
Less: Allowance for loan losses	(3,428)	(3,197)	(3,197)	(4,176)
Residential real estate: | Residential line of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	190,480	194,986
Less: Allowance for loan losses	(811)	(944)	(1,613)	(2,201)
Residential real estate: | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	75,457	62,374
Less: Allowance for loan losses	(566)	(434)	(504)	(311)
Commercial real estate: | Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	493,524	495,872
Less: Allowance for loan losses	(3,132)	(3,558)	(3,302)	(3,682)
Commercial real estate: | Non-owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	700,248	551,588
Less: Allowance for loan losses	(4,149)	(2,817)	(2,019)	(2,622)
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	228,853	217,701
Less: Allowance for loan losses	$ (1,769)	$ (1,495)	$ (863)	$ (1,190)

Loans and allowance for loan _4

Loans and allowance for loan losses - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Carrying value of PCI loans	$ 68,999,000	$ 88,835,000	$ 16,058,000
Accretion of interest income	7,608,000	5,419,000	3,538,000
Non-accrual loans	2,703,000	3,205,000
Recorded investment in troubled debt restructurings	6,794,000	8,604,000
Allocation to specific reserves	63,000	172,000
Commitments to lend additional amounts to customers	0	2,000
Payment default for loans modified as troubled debt restructurings	0	0
Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Carrying value of PCI loans	68,999,000	88,835,000
Purchase accounting liquidity discount	2,436,000
Purchase accounting non accretable credit discount	4,355,000
Accretion of interest income	9,010,000	5,299,000	2,631,000
Total purchase accounting contribution through accretion for purchased loans	7,608,000	5,419,000	$ 3,538,000
Non-accrual loans	0	0
Non-Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Purchase accounting liquidity discount	7,527,000	2,197,000
Federal Reserve
Financing Receivable, Recorded Investment, Past Due [Line Items]
Pledged loans to the Federal Reserve Bank	1,336,092,000	737,856,000
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	618,976,000	761,197,000
Commercial Loan | Federal Home Loan Bank of Cincinnati
Financing Receivable, Recorded Investment, Past Due [Line Items]
Pledge loans for Federal Home Loan Bank Debt	$ 608,735,000	$ 207,370,000

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	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretion	$ 7,608	$ 5,419	$ 3,538
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	(17,682)	(2,444)	(1,637)
Additions through the acquisition of the Clayton Banks	0	(18,868)	0
Principal reductions and other reclassifications from nonaccretable difference	4,047	1,841	3,438
Recoveries	0	23	0
Accretion	9,010	5,299	2,631
Changes in expected cash flows	(3,868)	195	0
Balance at end of period	$ (16,587)	$ (17,682)	$ (2,444)

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	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 24,041	$ 21,747	$ 24,460
Provision for loan losses	5,398	(950)	(1,479)
Recoveries of loans previously charged-off	2,647	5,771	1,616
Loans charged off	(2,805)	(2,527)	(2,850)
Adjustments for transfers to loans HFS	(349)
Ending balance	28,932	24,041	21,747
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,461	5,309	5,135
Provision for loan losses	1,395	(2,158)	212
Recoveries of loans previously charged-off	390	1,894	524
Loans charged off	(898)	(584)	(562)
Adjustments for transfers to loans HFS	0
Ending balance	5,348	4,461	5,309
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,135	4,940	5,143
Provision for loan losses	1,459	1,138	(417)
Recoveries of loans previously charged-off	1,164	1,084	216
Loans charged off	(29)	(27)	(2)
Adjustments for transfers to loans HFS	0
Ending balance	9,729	7,135	4,940
Residential real estate: | 1-to-4 family mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,197	3,197	4,176
Provision for loan losses	547	41	(882)
Recoveries of loans previously charged-off	171	159	127
Loans charged off	(138)	(200)	(224)
Adjustments for transfers to loans HFS	(349)
Ending balance	3,428	3,197	3,197
Residential real estate: | Residential line of credit
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	944	1,613	2,201
Provision for loan losses	(275)	(788)	(630)
Recoveries of loans previously charged-off	178	395	174
Loans charged off	(36)	(276)	(132)
Adjustments for transfers to loans HFS	0
Ending balance	811	944	1,613
Residential real estate: | Multi-family mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	434	504	311
Provision for loan losses	132	(70)	193
Recoveries of loans previously charged-off	0	0	0
Loans charged off	0	0	0
Adjustments for transfers to loans HFS	0
Ending balance	566	434	504
Commercial real estate: | Owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,558	3,302	3,682
Provision for loan losses	(478)	483	(271)
Recoveries of loans previously charged-off	143	61	140
Loans charged off	(91)	(288)	(249)
Adjustments for transfers to loans HFS	0
Ending balance	3,132	3,558	3,302
Commercial real estate: | Non-owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,817	2,019	2,622
Provision for loan losses	1,281	(848)	(271)
Recoveries of loans previously charged-off	51	1,646	195
Loans charged off	0	0	(527)
Adjustments for transfers to loans HFS	0
Ending balance	4,149	2,817	2,019
Consumer and other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,495	863	1,190
Provision for loan losses	1,337	1,252	587
Recoveries of loans previously charged-off	550	532	240
Loans charged off	(1,613)	(1,152)	(1,154)
Adjustments for transfers to loans HFS	0
Ending balance	$ 1,769	$ 1,495	$ 863

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	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 268	$ 191	$ 513
Collectively evaluated for impairment	27,783	23,850	21,234
Acquired with deteriorated credit quality	881	0	0
Ending balance	28,932	24,041	21,747	$ 24,460
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	3	20	135
Collectively evaluated for impairment	5,247	4,441	5,174
Acquired with deteriorated credit quality	98	0	0
Ending balance	5,348	4,461	5,309	5,135
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	9,677	7,135	4,940
Acquired with deteriorated credit quality	52	0	0
Ending balance	9,729	7,135	4,940	5,143
Residential real estate: | 1-to-4 family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	7	18	23
Collectively evaluated for impairment	3,205	3,179	3,174
Acquired with deteriorated credit quality	216	0	0
Ending balance	3,428	3,197	3,197	4,176
Residential real estate: | Residential line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	811	944	1,613
Acquired with deteriorated credit quality	0	0	0
Ending balance	811	944	1,613	2,201
Residential real estate: | Multi-family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	566	434	504
Acquired with deteriorated credit quality	0	0	0
Ending balance	566	434	504	311
Commercial real estate: | Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	53	120	113
Collectively evaluated for impairment	3,066	3,438	3,189
Acquired with deteriorated credit quality	13	0	0
Ending balance	3,132	3,558	3,302	3,682
Commercial real estate: | Non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	205	33	242
Collectively evaluated for impairment	3,628	2,784	1,777
Acquired with deteriorated credit quality	316	0	0
Ending balance	4,149	2,817	2,019	2,622
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	1,583	1,495	863
Acquired with deteriorated credit quality	186	0	0
Ending balance	$ 1,769	$ 1,495	$ 863	$ 1,190

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	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 13,716	$ 9,373	$ 12,951
Collectively evaluated for impairment	3,584,796	3,068,703	1,819,775
Acquired with deteriorated credit quality	68,999	88,835	16,058
Gross loans	3,667,511	3,166,911	1,848,784
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	1,847	1,579	1,476
Collectively evaluated for impairment	863,788	711,352	384,279
Acquired with deteriorated credit quality	1,448	2,144	478
Gross loans	867,083	715,075	386,233
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	1,221	1,289	2,686
Collectively evaluated for impairment	549,075	439,309	238,900
Acquired with deteriorated credit quality	5,755	7,728	4,319
Gross loans	556,051	448,326	245,905
Residential real estate: | 1-to-4 family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	987	1,262	2,471
Collectively evaluated for impairment	535,451	456,229	290,346
Acquired with deteriorated credit quality	19,377	23,498	2,107
Gross loans	555,815	480,989	294,924
Residential real estate: | Residential line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	245	0	311
Collectively evaluated for impairment	190,235	194,986	176,879
Acquired with deteriorated credit quality	0	0	0
Gross loans	190,480	194,986	177,190
Residential real estate: | Multi-family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	0	978	1,027
Collectively evaluated for impairment	75,457	61,376	43,922
Acquired with deteriorated credit quality	0	20	28
Gross loans	75,457	62,374	44,977
Commercial real estate: | Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	2,608	2,520	2,752
Collectively evaluated for impairment	484,900	481,390	350,812
Acquired with deteriorated credit quality	6,016	11,962	3,782
Gross loans	493,524	495,872	357,346
Commercial real estate: | Non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	6,735	1,720	2,201
Collectively evaluated for impairment	677,247	531,704	260,361
Acquired with deteriorated credit quality	16,266	18,164	5,340
Gross loans	700,248	551,588	267,902
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	73	25	27
Collectively evaluated for impairment	208,643	192,357	74,276
Acquired with deteriorated credit quality	20,137	25,319	4
Gross loans	$ 228,853	$ 217,701	$ 74,307

Loans and allowance for loan _9

Loans and allowance for loan losses - Credit Quality Indicators by Portfolio Class (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	$ 3,598,512	$ 3,078,076
Purchased credit impaired loans	68,999	88,835	$ 16,058
Total loans	3,667,511	3,166,911	1,848,784
Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	3,458,495	2,940,174
Purchased credit impaired loans	0	0
Total loans	3,458,495	2,940,174
Watch
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	95,857	114,401
Purchased credit impaired loans	46,672	56,848
Total loans	142,529	171,249
Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	44,160	23,501
Purchased credit impaired loans	22,327	31,987
Total loans	66,487	55,488
Commercial and industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	865,635	712,931
Purchased credit impaired loans	1,448	2,144	478
Total loans	867,083	715,075	386,233
Commercial and industrial | Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	804,447	657,595
Purchased credit impaired loans	0	0
Commercial and industrial | Watch
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	52,624	50,946
Purchased credit impaired loans	964	1,499
Commercial and industrial | Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	8,564	4,390
Purchased credit impaired loans	484	645
Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	550,296	440,598
Purchased credit impaired loans	5,755	7,728	4,319
Total loans	556,051	448,326	245,905
Construction | Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	543,953	431,242
Purchased credit impaired loans	0	0
Construction | Watch
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	5,012	7,388
Purchased credit impaired loans	3,229	3,324
Construction | Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	1,331	1,968
Purchased credit impaired loans	2,526	4,404
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	536,438	457,491
Purchased credit impaired loans	19,377	23,498	2,107
Total loans	555,815	480,989	294,924
Residential real estate: | Residential line of credit
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	190,480	194,986
Purchased credit impaired loans	0	0	0
Total loans	190,480	194,986	177,190
Residential real estate: | Multi-family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	75,457	62,354
Purchased credit impaired loans	0	20	28
Total loans	75,457	62,374	44,977
Residential real estate: | Pass | 1-to-4 family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	519,541	440,202
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	186,753	192,427
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	75,381	61,234
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	8,697	9,522
Purchased credit impaired loans	14,681	20,284
Residential real estate: | Watch | Residential line of credit
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	1,039	1,184
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	76	142
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	8,200	7,767
Purchased credit impaired loans	4,696	3,214
Residential real estate: | Substandard | Residential line of credit
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	2,688	1,375
Purchased credit impaired loans	0	0
Residential real estate: | Substandard | Multi-family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	0	978
Purchased credit impaired loans	0	20
Commercial real estate: | Owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	487,508	483,910
Purchased credit impaired loans	6,016	11,962	3,782
Total loans	493,524	495,872	357,346
Commercial real estate: | Non-owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	683,982	533,424
Purchased credit impaired loans	16,266	18,164	5,340
Total loans	700,248	551,588	267,902
Commercial real estate: | Pass | Owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	456,694	451,140
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	667,447	517,253
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	16,765	28,308
Purchased credit impaired loans	4,110	4,631
Commercial real estate: | Watch | Non-owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	8,881	14,199
Purchased credit impaired loans	8,266	7,359
Commercial real estate: | Substandard | Owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	14,049	4,462
Purchased credit impaired loans	1,906	7,331
Commercial real estate: | Substandard | Non-owner occupied
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	7,654	1,972
Purchased credit impaired loans	8,000	10,805
Consumer and other
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	208,716	192,382
Purchased credit impaired loans	20,137	25,319	4
Total loans	228,853	217,701	$ 74,307
Consumer and other | Pass
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	204,279	189,081
Purchased credit impaired loans	0	0
Consumer and other | Watch
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	2,763	2,712
Purchased credit impaired loans	15,422	19,751
Consumer and other | Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	1,674	589
Purchased credit impaired loans	$ 4,715	$ 5,568

Loans and allowance for loan_10

Loans and allowance for loan losses - Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 3,667,511	$ 3,166,911
Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	68,999	88,835
Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	13,685	8,101
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	9,208	15,063
90 Days or More and Accruing Interest
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	3,041	1,996
Financing Receivables Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	3,572,578	3,052,916
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	867,083	715,075
Commercial and industrial | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,448	2,144
Commercial and industrial | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,124	533
Commercial and industrial | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	999	5,859
Commercial and industrial | 90 Days or More and Accruing Interest
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	65	90
Commercial and industrial | Financing Receivables Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	858,447	706,449
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	556,051	448,326
Construction | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,755	7,728
Construction | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	283	300
Construction | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	109	1,412
Construction | 90 Days or More and Accruing Interest
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	241
Construction | Financing Receivables Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	549,904	438,645
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	555,815	480,989
Residential real estate: | 1-to-4 family mortgage | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	19,377	23,498
Residential real estate: | 1-to-4 family mortgage | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,704	2,548
Residential real estate: | Residential line of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	190,480	194,986
Residential real estate: | Residential line of credit | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Residential real estate: | Residential line of credit | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	804	699
Residential real estate: | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	75,457	62,374
Residential real estate: | Multi-family mortgage | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	20
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	4,919	4,678
Residential real estate: | 30-89 Days Past Due | Residential line of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	726	527
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	737	956
Residential real estate: | 90 Days or More and Accruing Interest | Residential line of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	957	134
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	528,078	449,309
Residential real estate: | Financing Receivables Current | Residential line of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	187,993	193,626
Residential real estate: | Financing Receivables Current | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	75,457	62,354
Commercial real estate: | Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	493,524	495,872
Commercial real estate: | Owner occupied | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,016	11,962
Commercial real estate: | Owner occupied | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,423	2,582
Commercial real estate: | Non-owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	700,248	551,588
Commercial real estate: | Non-owner occupied | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	16,266	18,164
Commercial real estate: | Non-owner occupied | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,199	1,371
Commercial real estate: | 30-89 Days Past Due | Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	407	521
Commercial real estate: | 30-89 Days Past Due | Non-owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	61	121
Commercial real estate: | 90 Days or More and Accruing Interest | Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	197	358
Commercial real estate: | 90 Days or More and Accruing Interest | Non-owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	77	0
Commercial real estate: | Financing Receivables Current | Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	484,481	480,449
Commercial real estate: | Financing Receivables Current | Non-owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	682,645	531,932
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	228,853	217,701
Consumer and other | Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	20,137	25,319
Consumer and other | Non Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	148	68
Consumer and other | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,987	1,945
Consumer and other | 90 Days or More and Accruing Interest
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,008	217
Consumer and other | Financing Receivables Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 205,573	$ 190,152

Loans and allowance for loan_11

Loans and allowance for loan losses - Impaired Loans Recognized, Segregated by Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	$ 7,009	$ 1,235
Impaired loans with related allowance, unpaid principal	7,204	1,821
Impaired loans with related allowance, related allowance	268	191
Impaired loan with no related allowance, recorded investment	6,707	8,138
Impaired loan with no related allowance, unpaid principal	8,577	9,451
Total impaired loans, recorded investment	13,716	9,373
Total impaired loans, unpaid principal	15,781	11,272
Impaired loans with related allowance, average recorded investment	4,122	1,992	$ 6,432
Impaired loans with related allowance, interest income recognized (cash basis)	175	64	43
Impaired loan with no related allowance, average recorded investment	7,423	9,175	7,835
Impaired loan with no related allowance, interest income recognized (cash basis)	418	335	455
Total impaired loans, average recorded investment	11,545	11,167	14,267
Total impaired loans, interest income recognized (cash basis)	593	399	498
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	618	53
Impaired loans with related allowance, unpaid principal	732	53
Impaired loans with related allowance, related allowance	3	20
Impaired loan with no related allowance, recorded investment	1,229	1,526
Impaired loan with no related allowance, unpaid principal	1,281	1,570
Impaired loans with related allowance, average recorded investment	335	454	994
Impaired loans with related allowance, interest income recognized (cash basis)	121	2	17
Impaired loan with no related allowance, average recorded investment	1,377	1,074	494
Impaired loan with no related allowance, interest income recognized (cash basis)	70	38	20
Construction
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	0	0
Impaired loans with related allowance, unpaid principal	0	0
Impaired loans with related allowance, related allowance	0	0
Impaired loan with no related allowance, recorded investment	1,221	1,289
Impaired loan with no related allowance, unpaid principal	1,262	1,313
Impaired loans with related allowance, average recorded investment	0	0	154
Impaired loans with related allowance, interest income recognized (cash basis)	0	0	0
Impaired loan with no related allowance, average recorded investment	1,255	1,988	2,622
Impaired loan with no related allowance, interest income recognized (cash basis)	74	46	132
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	145	194
Impaired loans with related allowance, unpaid principal	145	495
Impaired loans with related allowance, related allowance	7	18
Impaired loan with no related allowance, recorded investment	842	1,068
Impaired loan with no related allowance, unpaid principal	1,151	1,072
Impaired loans with related allowance, average recorded investment	170	149	1,750
Impaired loans with related allowance, interest income recognized (cash basis)	9	9	1
Impaired loan with no related allowance, average recorded investment	955	1,718	1,329
Impaired loan with no related allowance, interest income recognized (cash basis)	74	63	137
Residential real estate: | Residential line of credit
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	0	0
Impaired loans with related allowance, unpaid principal	0	0
Impaired loans with related allowance, related allowance	0	0
Impaired loan with no related allowance, recorded investment	245	0
Impaired loan with no related allowance, unpaid principal	249	0
Impaired loans with related allowance, average recorded investment	0	0	0
Impaired loans with related allowance, interest income recognized (cash basis)	0	0	0
Impaired loan with no related allowance, average recorded investment	123	156	156
Impaired loan with no related allowance, interest income recognized (cash basis)	15	0	10
Residential real estate: | Multi-family mortgage
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	0	0
Impaired loans with related allowance, unpaid principal	0	0
Impaired loans with related allowance, related allowance	0	0
Impaired loan with no related allowance, recorded investment	0	978
Impaired loan with no related allowance, unpaid principal	0	978
Impaired loans with related allowance, average recorded investment	0	0	0
Impaired loans with related allowance, interest income recognized (cash basis)	0	0	0
Impaired loan with no related allowance, average recorded investment	489	1,003	1,051
Impaired loan with no related allowance, interest income recognized (cash basis)	26	46	37
Commercial real estate: | Owner occupied
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	560	844
Impaired loans with related allowance, unpaid principal	641	1,123
Impaired loans with related allowance, related allowance	53	120
Impaired loan with no related allowance, recorded investment	2,048	1,676
Impaired loan with no related allowance, unpaid principal	2,780	2,168
Impaired loans with related allowance, average recorded investment	702	740	1,756
Impaired loans with related allowance, interest income recognized (cash basis)	43	48	25
Impaired loan with no related allowance, average recorded investment	1,862	1,897	1,120
Impaired loan with no related allowance, interest income recognized (cash basis)	148	122	119
Commercial real estate: | Non-owner occupied
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	5,686	144
Impaired loans with related allowance, unpaid principal	5,686	150
Impaired loans with related allowance, related allowance	205	33
Impaired loan with no related allowance, recorded investment	1,049	1,576
Impaired loan with no related allowance, unpaid principal	1,781	2,325
Impaired loans with related allowance, average recorded investment	2,915	648	1,777
Impaired loans with related allowance, interest income recognized (cash basis)	2	5	0
Impaired loan with no related allowance, average recorded investment	1,313	1,313	1,050
Impaired loan with no related allowance, interest income recognized (cash basis)	7	19	0
Consumer and other
Financing Receivable, Impaired [Line Items]
Impaired loans with related allowance, recorded investment	0	0
Impaired loans with related allowance, unpaid principal	0	0
Impaired loans with related allowance, related allowance	0	0
Impaired loan with no related allowance, recorded investment	73	25
Impaired loan with no related allowance, unpaid principal	73	25
Impaired loans with related allowance, average recorded investment	0	1	1
Impaired loans with related allowance, interest income recognized (cash basis)	0	0	0
Impaired loan with no related allowance, average recorded investment	49	26	13
Impaired loan with no related allowance, interest income recognized (cash basis)	$ 4	$ 1	$ 0

Loans and allowance for loan_12

Loans and allowance for loan losses - Financial Effect of TDRs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)loan	Dec. 31, 2017USD ($)loan	Dec. 31, 2016USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of loans | loan	9	7	9
Pre-modification outstanding recorded investment	$ 1,340	$ 1,883	$ 1,966
Post-modification outstanding recorded investment	1,340	1,883	1,966
Charge offs and specific reserves	$ 0	$ 76	$ 0
Consumer and other
Financing Receivable, Modifications [Line Items]
Number of loans | loan	5	1	3
Pre-modification outstanding recorded investment	$ 61	$ 25	$ 29
Post-modification outstanding recorded investment	61	25	29
Charge offs and specific reserves	$ 0	$ 0	$ 0
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of loans | loan	2	2
Pre-modification outstanding recorded investment	$ 887	$ 627
Post-modification outstanding recorded investment	887	627
Charge offs and specific reserves	$ 0	$ 0
Commercial real estate: | Owner occupied
Financing Receivable, Modifications [Line Items]
Number of loans | loan	1	1	1
Pre-modification outstanding recorded investment	$ 143	$ 377	$ 118
Post-modification outstanding recorded investment	143	377	118
Charge offs and specific reserves	$ 0	$ 0	$ 0
Commercial real estate: | Non-owner occupied
Financing Receivable, Modifications [Line Items]
Number of loans | loan		2
Pre-modification outstanding recorded investment		$ 711
Post-modification outstanding recorded investment		711
Charge offs and specific reserves		$ 68
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Modifications [Line Items]
Number of loans | loan	1	1	5
Pre-modification outstanding recorded investment	$ 249	$ 143	$ 1,819
Post-modification outstanding recorded investment	249	143	1,819
Charge offs and specific reserves	$ 0	$ 8	$ 0

Premises and equipment - Schedu

Premises and equipment - Schedule of Premises and Equipment and Related Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 136,498	$ 126,880
Less: accumulated depreciation	(49,616)	(45,303)
Total Premises and Equipment	86,882	81,577
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	25,821	22,108
Premises
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	60,995	57,719
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	23,220	22,292
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	11,819	10,740
Equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	13,774	12,525
Construction in process
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 869	$ 1,496

Premises and equipment - Narrat

Premises and equipment - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 4,334	$ 4,316	$ 3,995

Other real estate owned - Summa

Other real estate owned - Summary of Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Real Estate [Roll Forward]
Balance at beginning of period	$ 16,442	$ 7,403	$ 11,641
Transfers from loans	2,138	3,605	2,724
Transfers from premises and equipment	0	3,466	0
Acquired through merger or acquisition	0	6,888	0
Properties sold	(4,819)	(5,438)	(6,696)
Gain on sale of other real estate owned	271	1,080	1,670
Transferred to loans	(1,019)	(256)	(1,548)
Write-downs and partial liquidations	(370)	(306)	(388)
Balance at end of period	$ 12,643	$ 16,442	$ 7,403

Other real estate owned - Narra

Other real estate owned - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017USD ($)branch	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Real Estate Properties [Line Items]
Real estate acquired through merger		$ 0	$ 6,888	$ 0
Excess land and facilities transferred		0	3,466	$ 0
Other real estate owned included excess land and facilities held for sale		5,381	5,895
Clayton Bank and Trust and American City Bank
Real Estate Properties [Line Items]
Real estate acquired through merger			7,000
Excess land and facilities transferred	$ 3,466		4,147
Number of branch locations consolidated as part of merger or acquisition | branch	5
Residential Real Estate Properties
Real Estate Properties [Line Items]
Foreclosed residential real estate properties	$ 3,631	2,101	3,631
Total foreclosure proceedings in process	$ 19	$ 478	$ 19

Goodwill and intangible asset_2

Goodwill and intangible assets - Narrative (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 137,190	$ 137,190	$ 46,867
Amortization of core deposit and other intangibles		$ 3,185	$ 1,995	$ 2,132
Clayton Bank and Trust and American City Bank
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 90,323
Clayton Bank and Trust and American City Bank | Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 9,060
Estimated useful life of intangible assets	3 years
Clayton Bank and Trust and American City Bank | Leasehold intangible
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 587
Estimated useful life of intangible assets	6 years 6 months
Clayton Bank and Trust and American City Bank | Customer base trust intangible
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 1,600
Estimated useful life of intangible assets	10 years
Clayton Bank and Trust and American City Bank | Manufactured housing servicing intangible
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 1,088
Estimated useful life of intangible assets	5 years

Goodwill and intangible asset_3

Goodwill and intangible assets - Schedule of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 42,190	$ 42,190
Accumulated Amortization	(30,562)	(27,288)
Net Carrying Amount	11,628	14,902
Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	38,915	38,915
Accumulated Amortization	(29,901)	(27,121)
Net Carrying Amount	9,014	11,794
Leasehold intangible
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	587	587
Accumulated Amortization	(127)	(38)
Net Carrying Amount	460	549
Customer base trust intangible
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,600	1,600
Accumulated Amortization	(227)	(67)
Net Carrying Amount	1,373	1,533
Manufactured housing servicing intangible
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,088	1,088
Accumulated Amortization	(307)	(62)
Net Carrying Amount	$ 781	$ 1,026

Goodwill and intangible asset_4

Goodwill and intangible assets - Schedule of Estimated Aggregate Amortization Expense of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
December 31, 2019	$ 2,862
December 31, 2020	2,476
December 31, 2021	2,090
December 31, 2022	1,614
December 31, 2023	1,101
Thereafter	1,485
Net Carrying Amount	$ 11,628	$ 14,902

Mortgage servicing rights - Sch

Mortgage servicing rights - Schedule of Changes in Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Servicing Asset at Fair Value, Amount [Roll Forward]
Carrying value prior to policy change	$ 76,107	$ 32,070	$ 29,711
Fair value impact of change in accounting policy (See Note 1)	0	1,011	0
Carrying value at beginning of period	76,107	33,081	29,711
Capitalization	54,913	58,984	46,070
Amortization	0	0	(8,321)
Sales	(39,428)	(11,686)	(34,118)
(Loss) gain on sale	0	(249)	3,406
Impairment	0	0	(4,678)
Change in fair value:
Due to pay-offs/pay-downs	(11,062)	(3,104)	0
Due to change in valuation inputs or assumptions	8,299	(919)	0
Carrying value at December 31	$ 88,829	$ 76,107	$ 32,070

Mortgage servicing rights - S_2

Mortgage servicing rights - Schedule of Servicing Income and Expense Included in Mortgage Banking Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Servicing income:
Servicing income	$ 20,591	$ 13,168	$ 12,063
Change in fair value of mortgage servicing rights	(2,763)	(4,023)	0
Change in fair value of derivative hedging instruments	(5,910)	599	0
Total servicing income	11,918	9,744	12,063
Servicing expenses:
Servicing asset amortization	0	0	8,321
Servicing asset impairment	0	0	4,678
Loss on sale of mortgage servicing rights, related hedges and transaction costs on sale	0	249	4,447
Other servicing expenses	7,675	4,896	2,325
Total servicing expenses	7,675	5,145	19,771
Net servicing income (loss)	$ 4,243	$ 4,599	$ (7,708)

Mortgage servicing rights - S_3

Mortgage servicing rights - Schedule of Data and Key Economic Assumptions Related to Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Transfers and Servicing [Abstract]
Unpaid principal balance	$ 6,755,114	$ 6,529,431
Weighted-average prepayment speed (CPR)	8.58%	8.90%
Estimated impact on fair value of a 10% increase	$ (2,072)	$ (3,026)
Estimated impact on fair value of a 20% increase	$ (4,006)	$ (5,855)
Discount rate	10.45%	9.75%
Estimated impact on fair value of a 100 bp increase	$ 2,505	$ 3,052
Estimated impact on fair value of a 200 bp increase	$ 4,807	$ 5,867
Weighted-average coupon interest rate	4.21%	3.94%
Weighted-average servicing fee (basis points)	0.30%	0.28%
Weighted-average remaining maturity (in months)	325 months	335 months

Mortgage servicing rights - Nar

Mortgage servicing rights - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Transfer of Financial Assets Accounted for as Sales [Line Items]
Mortgage servicing rights sold		$ 39,428	$ 11,686	$ 34,118
Mortgage loans serviced		3,181,483	$ 1,086,465	$ 3,370,395
Mortgage escrow deposit		$ 53,468
Scenario, Forecast
Transfer of Financial Assets Accounted for as Sales [Line Items]
Mortgage loans serviced related to bulk sale of mortgage servicing rights	$ 2,061,175
Subsequent Event
Transfer of Financial Assets Accounted for as Sales [Line Items]
Mortgage servicing rights sold	29,416
Mortgage loans serviced related to bulk sale of mortgage servicing rights	$ 2,034,374

Other assets and other liabil_3

Other assets and other liabilities - Summary of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Assets And Other Liabilities [Abstract]
Cash surrender value on bank owned life insurance	$ 11,115	$ 10,873
Prepaid expenses	3,283	2,477
Software	1,313	1,962
Mortgage lending receivable	3,876	3,703
Derivatives (See Note 16)	14,316	9,690
FHLB lender risk account receivable (See Note 1)	5,225	0
Other assets	30,974	15,511
Total other assets	$ 70,102	$ 44,216

Other assets and other liabil_4

Other assets and other liabilities - Summary of Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Assets And Other Liabilities [Abstract]
Deferred compensation	$ 3,836	$ 5,301
Accrued payroll	8,026	11,018
Mortgage servicing escrows	4,441	3,341
Mortgage buyback reserve	3,273	3,386
Accrued interest	5,015	1,504
Derivatives (See Note 16)	11,637	1,699
Deferred tax liability (See Note 13)	16,663	11,858
Right to repurchase GNMA loans serviced (See Note 1)	0	43,035
FHLB lender risk account guaranty	2,646	0
Other liabilities	9,877	37,852
Total other liabilities	$ 65,414	$ 118,994

Deposits - Additional Informati

Deposits - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Banking and Thrift [Abstract]
Time deposits in denomination of greater than $250	$ 353,134	$ 176,837
Deposits in overdraft status reclassified as loans	$ 2,738	$ 1,640

Deposits - Schedule of Maturiti

Deposits - Schedule of Maturities of Time Deposits (Details) $ in Thousands	Dec. 31, 2018USD ($)
Time Deposits, Fiscal Year Maturity [Abstract]
December 31, 2019	$ 755,870
December 31, 2020	220,751
December 31, 2021	60,928
December 31, 2022	16,887
December 31, 2023	64,811
Thereafter	498
Total	$ 1,119,745

Borrowings - Securities Sold Un

Borrowings - Securities Sold Under Agreements to Repurchase and Federal Funds Purchased (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Line of credit	$ 240,000,000
Borrowings against lines	0	$ 0
Mortgage Backed Securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreement to repurchase, carrying value	$ 15,081,000	$ 14,293,000

Borrowings - Summary of Balance

Borrowings - Summary of Balances for Securities Sold Under Agreements to Repurchase (Details) - Mortgage Backed Securities - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]
Balance at year end	$ 15,081	$ 14,293
Average daily balance during the year	$ 16,128	$ 16,326
Average interest rate during the year	0.28%	0.17%
Maximum month-end balance during the year	$ 19,651	$ 19,432
Weighted average interest rate at year-end	0.74%	0.16%

Borrowings - Federal Home Loan

Borrowings - Federal Home Loan Bank Advances (Details) $ in Thousands	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)derivative	Jul. 31, 2017USD ($)	Jun. 30, 2017derivative
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Collateral securing line of credit	$ 1,227,711	$ 968,567
Total borrowing capacity remaining	736,962	671,461
Letter of credit pledged	100,000
Line of credit secured	800,000
Borrowings against line of credit	$ 181,765	$ 302,372
Notional Amount			$ 100,000
Average interest rate on outstanding advances	1.93%
Interest rate swaps
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Number of derivative instruments | derivative		3		3
Interest Rate Swaps Five
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Notional Amount		$ 35,000	35,000
Interest Rate Swaps Three
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Notional Amount		30,000	30,000
Interest Rate Swaps Four
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Notional Amount		35,000	$ 35,000
Long Term Advances
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Borrowings against line of credit	$ 1,765	12,372
Cash Management Advances
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Borrowings against line of credit	80,000	190,000
90 Day Fixed Rate Advance
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Borrowings against line of credit	100,000	100,000
Federal Reserve Bank
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Line of credit	$ 934,745	529,547
Minimum
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Floating and fixed interest rates	2.43%
Maximum
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Floating and fixed interest rates	7.78%
Collateral Pledged
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Securities pledged	$ 326,215	337,604
Collateral Pledged | Federal Reserve Bank
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Securities pledged	8,569	13,544
Federal Reserve
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Pledged loans to the Federal Reserve Bank	$ 1,336,092	$ 737,856

Borrowings - Summary of Debt Ma

Borrowings - Summary of Debt Maturities (Details) - Federal Home Loan Bank Advances $ in Thousands	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
December 31, 2019	$ 180,060
December 31, 2020	59
December 31, 2021	283
December 31, 2022	692
December 31, 2023	124
Due thereafter	547
Total	$ 181,765

Borrowings - Subordinated Debt

Borrowings - Subordinated Debt (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2003USD ($)trust
Debt Instrument [Line Items]
Net proceeds from sale of common stock	$ 1,196	$ 153,356	$ 116,054
Junior Subordinated Debentures
Debt Instrument [Line Items]
Number of separate trusts | trust				2
Preferred securities issued to form the trust				$ 30,000
Junior Subordinated Debentures | Floating Rate Trust Preferred Securities Trust I
Debt Instrument [Line Items]
Preferred securities issued to form the trust				9,000
Proceeds from issuance of debt				9,280
Net proceeds from sale of common stock				280
Debt instrument, interest rate	5.65%	4.59%
Junior Subordinated Debentures | Floating Rate Trust Preferred Securities Trust I | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.25%
Junior Subordinated Debentures | Floating Rate Trust Preferred Securities Trust II
Debt Instrument [Line Items]
Preferred securities issued to form the trust				21,000
Proceeds from issuance of debt				21,650
Net proceeds from sale of common stock				$ 650
Debt instrument, interest rate	5.97%	4.82%
Junior Subordinated Debentures | Floating Rate Trust Preferred Securities Trust II | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.15%

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	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current	$ 19,259	$ 14,629	$ 12,476
Deferred	6,359	6,458	9,257
Total	$ 25,618	$ 21,087	$ 21,733

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	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal taxes calculated at statutory rate	$ 22,230	$ 25,720	$ 5,061
Federal taxes calculated at statutory rate, percent	21.00%	35.00%	8.10%
Increase (decrease) resulting from:
State taxes, net of federal benefit	$ 4,666	$ 3,053	$ 3,664
Revaluation of net deferred tax liability as a result of the Tax Cuts and Jobs Act	0	(5,894)	0
Conversion as of September 16, 2016 to C Corporation	0	0	13,181
Benefit of equity based compensation	(870)	(310)	(786)
Municipal interest income, net of interest disallowance	(837)	(1,402)	(633)
Bank owned life insurance	(51)	(85)	(24)
Stock offering costs	141	0	0
Other	339	5	1,270
Total	$ 25,618	$ 21,087	$ 21,733
Effective Income Tax Rate Reconciliation, Percent [Abstract]
State taxes, net of federal benefit, percent	4.40%	4.20%	5.90%
Revaluation of net deferred tax liability as a result of the Tax Cuts and Jobs Act, percent	(0.00%)	(8.00%)	(0.00%)
Conversion as of September 16, 2016 to C Corporation, percent	0.00%	0.00%	21.10%
Benefit of equity based compensation, percent	(0.80%)	(0.40%)	(1.30%)
Municipal interest income, net of interest disallowance, percent	(0.80%)	(1.90%)	(1.00%)
Bank owned life insurance, percent	(0.00%)	(0.20%)	(0.00%)
Stock offering costs, percent	0.10%	0.00%	0.00%
Other, percent	0.30%	0.00%	2.10%
Income tax expense, as reported	24.20%	28.70%	34.90%

Income taxes - Schedule of Net

Income taxes - Schedule of Net Deferred Tax liability (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Allowance for loan losses	$ 7,539	$ 6,264
Amortization of core deposit intangible	1,012	759
Deferred compensation	5,878	6,158
Unrealized loss on available-for-sale debt securities	3,299	988
Other	1,998	3,599
Subtotal	19,726	17,768
Deferred tax liabilities:
FHLB stock dividends	(550)	(550)
Depreciation	(4,812)	(4,115)
Cash flow hedges	(736)	0
Mortgage servicing rights	(23,146)	(19,830)
Other	(7,145)	(5,131)
Subtotal	(36,389)	(29,626)
Net deferred tax liability	$ (16,663)	$ (11,858)

Income taxes - Additional Infor

Income taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Reduction in deferred tax liability due to change in tax rate	$ 0	$ 5,894	$ 0
Deferred tax liability increased due to change in taxable status	0	0	13,181
Deferred income tax expense related to unrealized gain on available for sale securities	6,359	$ 6,458	$ 9,257
C Corporation [Member]
Income Taxes [Line Items]
Deferred income tax expense related to unrealized gain on available for sale securities	$ 2,955

Dividend restrictions - Additio

Dividend restrictions - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Amount available for payment of dividend without prior approval	$ 164,859,000	$ 105,453,000
Dividends declared	$ 0	$ 0

Commitments and contingencies -

Commitments and contingencies - Summary of Financial Instruments with Off-Balance Sheet Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Balance at end of period	$ 1,051,414	$ 1,000,158
Commitments to extend credit, excluding interest rate lock commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Balance at end of period	1,032,390	977,276
Letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Balance at end of period	$ 19,024	$ 22,882

Commitments and contingencies_2

Commitments and contingencies - Summary of Commitments Under Non-Cancelable Operating Leases (Details) $ in Thousands	Dec. 31, 2018USD ($)
Commitments and Contingencies Disclosure [Abstract]
2019	$ 4,328
2020	3,780
2021	3,548
2022	2,542
2023	1,613
Thereafter	6,250
Total	$ 22,061

Commitments and contingencies_3

Commitments and contingencies - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Operating leases rent expense	$ 4,940	$ 4,245	$ 3,904
Total principal amount of loans repurchased or indemnified	$ 6,646	$ 4,704	$ 8,326

Commitments and contingencies_4

Commitments and contingencies - Summary of Allowance for Loan Repurchases or Indemnifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 3,386	$ 2,659	$ 2,156
Provision for loan repurchases or indemnifications	174	810	512
Recoveries on previous losses	3	0	9
Losses on loans repurchased or indemnified	(290)	(83)	(18)
Balance at end of period	$ 3,273	$ 3,386	$ 2,659

Derivatives - Additional Inform

Derivatives - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Jul. 31, 2017USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)derivative	Jun. 30, 2017USD ($)derivative	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Derivative [Line Items]
Notional Amount	$ 100,000
Stockholders' equity			$ 671,857	$ 596,729		$ 330,498	$ 236,674
Cash collateral pledged on derivatives			13,904
Designated as hedging:
Derivative [Line Items]
Notional Amount			30,000	$ 130,000
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	3
Interest rate swaps | Designated as hedging:
Derivative [Line Items]
Notional Amount			30,000	$ 130,000
Fair value of interest rate swap				1,127
Interest rate swaps | Subordinated Debentures
Derivative [Line Items]
Notional Amount					$ 30,000
Fair value of interest rate swap			721	305
Interest Rate Swaps Three
Derivative [Line Items]
Notional Amount	$ 30,000			30,000
Derivative notional amount maturity period	3 years
Interest Rate Swaps Four
Derivative [Line Items]
Notional Amount	$ 35,000			35,000
Derivative notional amount maturity period	4 years
Interest Rate Swaps Five
Derivative [Line Items]
Notional Amount	$ 35,000			$ 35,000
Derivative notional amount maturity period	5 years
Gain on canceled derivatives		$ 1,564
Accumulated Gain (Loss), Net, Cash Flow Hedge, Paren
Derivative [Line Items]
Stockholders' equity			$ 1,436

Derivatives - Schedule of Deriv

Derivatives - Schedule of Derivative Financial Instruments (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Jul. 31, 2017
Derivatives, Fair Value [Line Items]
Notional Amount			$ 100,000,000
Asset	$ 14,316,000	$ 9,690,000
Liability	11,637,000	1,699,000
Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	1,258,047,000	1,810,484,000
Asset	13,595,000	8,258,000
Liability	11,637,000	1,699,000
Designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	30,000,000	130,000,000
Asset	721,000	1,432,000
Liability	0	0
Interest rate contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	295,333,000	146,754,000
Asset	6,679,000	1,146,000
Liability	6,679,000	1,146,000
Forward commitments | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	474,208,000	870,574,000
Asset	0	0
Liability	4,958,000	553,000
Interest rate-lock commitments | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	318,706,000	504,156,000
Asset	6,241,000	6,768,000
Liability	0	0
Futures contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	166,000,000	283,000,000
Asset	649,000	315,000
Liability	0	0
Option contracts | Not designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	3,800,000	6,000,000
Asset	26,000	29,000
Liability	0	0
Interest rate swaps | Designated as hedging:
Derivatives, Fair Value [Line Items]
Notional Amount	30,000,000	130,000,000
Asset	721,000	1,432,000
Liability	$ 0	$ 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	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Total cash flow hedge gain (loss) and derivative excluded component increase (decrease)			$ (5,569)
Amount of gain recognized in other comprehensive income, net of tax	$ 1,039	$ 685	0
Included in Loss on Sale of Mortgage Servicing Rights
Derivatives, Fair Value [Line Items]
Amount of gain recognized in interest expense and borrowings and loss on sale of mortgage servicing rights			(5,569)
Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	298	(11,310)	11,332
Designated as hedging:
Derivatives, Fair Value [Line Items]
Total cash flow hedge gain (loss) and derivative excluded component increase (decrease)	160	(168)
Designated as hedging: | Interest Expense on Borrowings
Derivatives, Fair Value [Line Items]
Amount of gain recognized in interest expense and borrowings and loss on sale of mortgage servicing rights	128	0	0
Gain (loss) included in interest expense on borrowings	32	(168)	0
Designated as hedging: | Included in Loss on Sale of Mortgage Servicing Rights
Derivatives, Fair Value [Line Items]
Amount of gain recognized in interest expense and borrowings and loss on sale of mortgage servicing rights	0	0
Interest rate-lock commitments | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(527)	340	835
Forward commitments | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	3,864	(11,987)	10,497
Futures contracts | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(2,981)	315	0
Option contracts | Not designated as hedging: | Mortgage Banking Income
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (58)	$ 22	$ 0

Fair value of financial instr_3

Fair value of financial instruments - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financial assets:
Interest receivable	$ 14,503	$ 13,069
Mortgage servicing rights		76,107	$ 33,081	$ 29,711
Derivatives	14,316	9,690
Financial liabilities:
Derivatives	11,637	1,699
Level 1
Financial assets:
Cash and cash equivalents	125,356	119,751
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	3,051,972	2,976,066
Deposits, With stated maturities	0	0
Securities sold under agreement to repurchase and federal funds sold	15,081	14,293
Federal Home Loan Bank advances	0	190,000
Subordinated debt	0	0
Interest Payable	530	575
Derivatives	0	0
Level 2
Financial assets:
Cash and cash equivalents	0	0
Investment securities	658,805	540,388
Loans, net	0	3,064,373
Loans held for sale	278,815	526,185
Interest receivable	2,848	13,069
Mortgage servicing rights	0	0
Derivatives	14,316	9,690
Financial liabilities:
Deposits, Without stated maturities	0	0
Deposits, With stated maturities	1,122,076	682,403
Securities sold under agreement to repurchase and federal funds sold	0	0
Federal Home Loan Bank advances	181,864	112,465
Subordinated debt	30,000	36,670
Interest Payable	4,485	929
Derivatives	11,637	1,699
Level 3
Financial assets:
Cash and cash equivalents	0	0
Investment securities	0	3,604
Loans, net	3,630,500	77,027
Loans held for sale	0	0
Interest receivable	11,655	0
Mortgage servicing rights	88,829	76,107
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	125,356	119,751
Investment securities	658,805	543,992
Federal Home Loan Bank Stock		11,412
Loans, net	3,638,579	3,142,870
Loans held for sale	278,815	526,185
Interest receivable	14,503	13,069
Mortgage servicing rights	88,829	76,107
Derivatives	14,316	9,690
Financial liabilities:
Deposits, Without stated maturities	3,051,972	2,976,066
Deposits, With stated maturities	1,119,745	688,329
Securities sold under agreement to repurchase and federal funds sold	15,081	14,293
Federal Home Loan Bank advances	181,765	302,372
Subordinated debt	30,930	30,930
Interest Payable	5,015	1,504
Derivatives	11,637	1,699
Fair Value
Financial assets:
Cash and cash equivalents	125,356	119,751
Investment securities	658,805	543,992
Loans, net	3,630,500	3,141,400
Loans held for sale	278,815	526,185
Interest receivable	14,503	13,069
Mortgage servicing rights	88,829	76,107
Derivatives	14,316	9,690
Financial liabilities:
Deposits, Without stated maturities	3,051,972	2,976,066
Deposits, With stated maturities	1,122,076	682,403
Securities sold under agreement to repurchase and federal funds sold	15,081	14,293
Federal Home Loan Bank advances	181,864	302,465
Subordinated debt	30,000	36,670
Interest Payable	5,015	1,504
Derivatives	$ 11,637	$ 1,699

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	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financial assets:
Available-for-sale debt securities, at fair value	$ 655,698	$ 536,270
Equity securities, at fair value	3,107	7,722
Mortgage servicing rights		76,107	$ 33,081	$ 29,711
Derivatives	14,316	9,690
Impaired loans	13,716	9,373
Financial liabilities:
Derivatives	11,637	1,699
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	658,805	540,388
Loans held for sale	278,815	526,185
Mortgage servicing rights	0	0
Derivatives	14,316	9,690
Financial liabilities:
Derivatives	11,637	1,699
Significant unobservable inputs (level 3)
Financial assets:
Investment securities	0	3,604
Loans held for sale	0	0
Mortgage servicing rights	88,829	76,107
Derivatives	0	0
Financial liabilities:
Derivatives	0	0
Fair Value, Measurements, Recurring
Financial assets:
Equity securities, at fair value	3,107	7,722
Investment securities	658,805	543,992
Loans held for sale	278,815	526,185
Mortgage servicing rights	88,829	76,107
Derivatives	14,316	9,690
Financial liabilities:
Derivatives	11,637	1,699
Fair Value, Measurements, Recurring | U.S. government agency securities
Financial assets:
Available-for-sale debt securities, at fair value	989	986
Fair Value, Measurements, Recurring | Mortgage-backed securities
Financial assets:
Available-for-sale debt securities, at fair value	508,580	418,781
Fair Value, Measurements, Recurring | Municipals, tax exempt
Financial assets:
Available-for-sale debt securities, at fair value	138,887	109,251
Fair Value, Measurements, Recurring | Treasury securities
Financial assets:
Available-for-sale debt securities, at fair value	7,242	7,252
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 | Significant other observable inputs (level 2)
Financial assets:
Equity securities, at fair value	3,107	4,118
Investment securities	658,805	540,388
Loans held for sale	278,815	526,185
Mortgage servicing rights	0	0
Derivatives	14,316	9,690
Financial liabilities:
Derivatives	11,637	1,699
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	989	986
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2) | Mortgage-backed securities
Financial assets:
Available-for-sale debt securities, at fair value	508,580	418,781
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2) | Municipals, tax exempt
Financial assets:
Available-for-sale debt securities, at fair value	138,887	109,251
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2) | Treasury securities
Financial assets:
Available-for-sale debt securities, at fair value	7,242	7,252
Fair Value, Measurements, Recurring | Significant unobservable inputs (level 3)
Financial assets:
Equity securities, at fair value	0	3,604
Investment securities	0	3,604
Loans held for sale	0	0
Mortgage servicing rights	88,829	76,107
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, Nonrecurring
Financial assets:
Other real estate owned	2,266	13,174
Impaired loans	8,718	77,027
Fair Value, Measurements, Nonrecurring | Commercial and industrial
Financial assets:
Impaired loans	732	1,971
Fair Value, Measurements, Nonrecurring | Consumer and other
Financial assets:
Impaired loans		25,320
Fair Value, Measurements, Nonrecurring | Construction Loans | Commercial and industrial
Financial assets:
Impaired loans	832	4,211
Fair Value, Measurements, Nonrecurring | 1-to-4 family mortgage | Residential real estate:
Financial assets:
Impaired loans	146	21,902
Fair Value, Measurements, Nonrecurring | Owner occupied | Commercial real estate:
Financial assets:
Impaired loans	87	10,030
Fair Value, Measurements, Nonrecurring | Non-owner occupied | Commercial real estate:
Financial assets:
Impaired loans	6,921	13,593
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	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	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	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	0
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3)
Financial assets:
Other real estate owned	2,266	13,174
Impaired loans	8,718	77,027
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Commercial and industrial
Financial assets:
Impaired loans	732	1,971
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Consumer and other
Financial assets:
Impaired loans		25,320
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Construction Loans | Commercial and industrial
Financial assets:
Impaired loans	832	4,211
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | 1-to-4 family mortgage | Residential real estate:
Financial assets:
Impaired loans	146	21,902
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Owner occupied | Commercial real estate:
Financial assets:
Impaired loans	87	10,030
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3) | Non-owner occupied | Commercial real estate:
Financial assets:
Impaired loans	$ 6,921	$ 13,593

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	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 3,604	$ 4,549
Reclassification of equity securities without a readily determinable fair value to other assets (1)	(3,604)	0
Impairment of equity securities	0	(945)
Balance at end of period	$ 0	$ 3,604

Fair value of financial instr_6

Fair value of financial instruments - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity securities without readily determinable fair value, amount reclassed				$ 3,604
Impairment of equity securities	$ 0	$ 945
Mortgage Loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net (losses) gains from fair value changes of mortgage loans	(4,539)	9,111	$ (2,289)
GNMA
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Delinquent GNMA loans that had been previously sold	67,362
Mortgage loans held for sale measured at fair value	$ 0	$ 43,035

Fair value of financial instr_7

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	Dec. 31, 2018	Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	$ 13,716	$ 9,373
Fair Value, Measurements, Nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	8,718	77,027
Other real estate owned	2,266	13,174
Fair Value, Measurements, Nonrecurring | Significant unobservable inputs (level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	8,718	77,027
Other real estate owned	$ 2,266	$ 13,174
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_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	Dec. 31, 2018	Dec. 31, 2017
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	$ 278,418	$ 482,089
Past due loans of 90 days or more	0	320
Nonaccrual loans	397	741
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	267,907	467,039
Past due loans of 90 days or more	0	320
Nonaccrual loans	397	741
Difference
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	10,511	15,050
Past due loans of 90 days or more	0	0
Nonaccrual loans	$ 0	$ 0

Parent company only financial_3

Parent company only financial statements - Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 125,356	$ 119,751	$ 136,327	$ 97,723
Other assets	70,102	44,216
Goodwill	137,190	137,190	46,867
Total assets	5,136,764	4,727,713	3,276,881
LIABILITIES
Accrued expenses and other liabilities	65,414	118,994
Total liabilities	4,464,907	4,130,984
SHAREHOLDERS' EQUITY
Common stock	30,725	30,536
Additional paid-in capital	424,146	418,596
Retained earnings	221,213	147,449
Accumulated other comprehensive (loss) income	(4,227)	148
Total shareholders' equity	671,857	596,729	330,498	236,674
Total liabilities and shareholders' equity	5,136,764	4,727,713
Parent Company
ASSETS
Cash and cash equivalents	17,400	25,789	$ 30,993	$ 1,253
Investments	0	1,129
Investments in Bank subsidiary	679,097	595,625
Other assets	7,364	5,411
Goodwill	29	29
Total assets	703,890	627,983
LIABILITIES
Borrowings	30,930	30,930
Accrued expenses and other liabilities	1,103	324
Total liabilities	32,033	31,254
SHAREHOLDERS' EQUITY
Common stock	30,725	30,536
Additional paid-in capital	424,146	418,596
Retained earnings	221,213	147,449
Accumulated other comprehensive (loss) income	(4,227)	148
Total shareholders' equity	671,857	596,729
Total liabilities and shareholders' equity	$ 703,890	$ 627,983

Parent company only financial_4

Parent company only financial statements - Income Statements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income
Other interest income	$ 2,126	$ 1,554	$ 611
Gain (loss) from other assets	328	(664)	(103)
Net interest income	204,068	153,271	110,950
Expenses
Interest expense	35,503	16,342	9,544
Other noninterest expense	32,584	28,035	22,551
Net income	80,236	52,398	40,591
Parent Company
Income
Other interest income	0	41	33
Interest income from Bank subsidiary	0	0	95
(Loss) gain on investments	0	(945)	417
Gain (loss) from other assets	297	0	0
Dividend income from Bank subsidiary	0	0	14,875
Earnings from Bank subsidiary	83,285	54,713	26,859
Net interest income	83,582	53,809	42,279
Expenses
Interest expense	1,651	1,491	1,393
Salaries, legal and professional fees	1,481	893	315
Other noninterest expense	960	296	168
Federal and state income tax benefit	(746)	(1,269)	(188)
Total expenses	3,346	1,411	1,688
Net income	$ 80,236	$ 52,398	$ 40,591

Parent company only financial_5

Parent company only financial statements - Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Activities
Net income	$ 80,236	$ 52,398	$ 40,591
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of other assets	(328)	664	103
Stock-based compensation expense	7,207	6,760	4,693
Net cash provided by (used in) operating activities	212,208	37,610	(245,201)
Investing Activities
Net cash used in investing activities	(586,501)	(267,168)	(32,741)
Financing Activities
Payment of dividends	(6,137)	0	(69,300)
Net proceeds from sale of common stock	1,196	153,356	116,054
Net cash provided by financing activities	379,898	212,982	316,546
Net change in cash and cash equivalents	5,605	(16,576)	38,604
Cash and cash equivalents at beginning of the period	119,751	136,327	97,723
Cash and cash equivalents at end of the period	125,356	119,751	136,327
Supplemental cash flow information:
Dividends declared not paid on restricted stock units	(226)	0	0
Noncash dividend from Bank	572	0	0
Conversion of cash-settled to stock settled compensation	0	0	5,388
Parent Company
Operating Activities
Net income	80,236	52,398	40,591
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed income of subsidiary bank	(83,285)	(54,713)	(26,859)
Loss (gain) on investments	0	945	(417)
Gain on sale of other assets	(297)	0	0
Stock-based compensation expense	7,207	0	4,693
Increase in other assets	(441)	(2,439)	(427)
Increase (decrease) in other liabilities	(7,737)	(551)	(5,251)
Other, net	0	0	7
Net cash provided by (used in) operating activities	(4,317)	(4,360)	12,337
Investing Activities
Proceeds from sale of other assets	869	0	0
Other investments	0	0	724
Net cash used in investing activities	869	0	724
Financing Activities
Equity contribution to Bank	0	(154,200)	(20,000)
Payment of dividends	(6,137)	0	(69,300)
Payment of borrowings	0	0	(10,075)
Net proceeds from sale of common stock	1,196	153,356	116,054
Net cash provided by financing activities	(4,941)	(844)	16,679
Net change in cash and cash equivalents	(8,389)	(5,204)	29,740
Cash and cash equivalents at beginning of the period	25,789	30,993	1,253
Cash and cash equivalents at end of the period	17,400	25,789	30,993
Supplemental cash flow information:
Conversion of cash-settled to stock settled compensation	0	0	5,388
Forgiveness of intercompany debt	$ 0	$ 0	$ 6,024

Segment reporting - Additional

Segment reporting - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)segment	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Interest income	$ 221,001	$ 153,969	$ 105,865
Mortgage Segment
Segment Reporting Information [Line Items]
Interest paid	$ 16,057	$ 16,932	$ 12,636
Mortgage Segment | Prime Interest Rate
Segment Reporting Information [Line Items]
Warehouse line of credit interest rate	5.50%	4.50%	3.75%
Banking Segment
Segment Reporting Information [Line Items]
Interest income	$ 16,057	$ 16,932	$ 12,636

Segment reporting - Schedule of

Segment reporting - Schedule of Segment Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net interest income	$ 204,068	$ 153,271	$ 110,950
Provision for loan losses	5,398	(950)	(1,479)
Mortgage banking income	109,334	120,357	117,751
Change in fair value of mortgage servicing rights	(8,673)	(3,424)
Other noninterest income	29,981	24,648	26,934
Depreciation and amortization	4,334	4,316	3,995
Amortization of core deposit and other intangibles	3,185	1,995	2,132
Amortization and impairment of mortgage servicing rights			12,999
Loss on sale of mortgage servicing rights	0	249	4,447
Other noninterest mortgage banking expense	94,739	98,296	82,351
Other noninterest expense	121,200	117,461	88,866
Income before income taxes	105,854	73,485	62,324
Income tax expense	25,618	21,087	21,733
Net income	80,236	52,398	40,591
Total assets	5,136,764	4,727,713	3,276,881
Goodwill	137,190	137,190	46,867
Merger and conversion	1,594	19,034	3,268
Banking Segment
Segment Reporting Information [Line Items]
Net interest income	204,517	153,018	112,365
Provision for loan losses	5,398	(950)	(1,479)
Mortgage banking income	25,460	26,737	25,542
Change in fair value of mortgage servicing rights	0	0
Other noninterest income	29,981	24,648	26,934
Depreciation and amortization	3,827	3,801	3,506
Amortization of core deposit and other intangibles	3,185	1,995	2,132
Amortization and impairment of mortgage servicing rights			0
Loss on sale of mortgage servicing rights		0	0
Other noninterest mortgage banking expense	21,671	21,714	16,095
Other noninterest expense	121,200	117,461	88,866
Income before income taxes	104,677	60,382	55,721
Total assets	4,752,111	4,130,349	2,752,773
Goodwill	137,090	137,090	46,767
Mortgage Segment
Segment Reporting Information [Line Items]
Net interest income	(449)	253	(1,415)
Provision for loan losses	0	0	0
Mortgage banking income	83,874	93,620	92,209
Change in fair value of mortgage servicing rights	(8,673)	(3,424)
Other noninterest income	0	0	0
Depreciation and amortization	507	515	489
Amortization of core deposit and other intangibles	0	0	0
Amortization and impairment of mortgage servicing rights			12,999
Loss on sale of mortgage servicing rights		249	4,447
Other noninterest mortgage banking expense	73,068	76,582	66,256
Other noninterest expense	0	0	0
Income before income taxes	1,177	13,103	6,603
Total assets	384,653	597,364	524,108
Goodwill	$ 100	$ 100	$ 100

Minimum capital requirements -

Minimum capital requirements - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Banking and Thrift [Abstract]
Capital conservative buffer percentage	1.88%	1.25%

Minimum capital requirements _2

Minimum capital requirements - Schedule of Actual and Required Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
FB Financial Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to risk-weighted assets), Actual Amount	$ 582,945	$ 496,422
Total Capital (to risk-weighted assets), Actual Ratio	13.00%	12.00%
Total Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 358,735	$ 330,672
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	$ 442,814	$ 382,340
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	9.90%	9.30%
Tier 1 Capital (to risk-weighted assets), Actual Amount	$ 554,013	$ 472,381
Tier 1 Capital (to risk-weighted assets), Actual Ratio	12.40%	11.40%
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 268,071	$ 247,969
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	$ 351,843	$ 299,629
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	7.90%	7.30%
Tier 1 Capital (to average assets), Actual Amount	$ 554,013	$ 472,381
Tier 1 Capital (to average assets), Actual Ratio	11.40%	10.50%
Tier 1 Capital (to average assets), For capital adequacy purposes, Amount	$ 194,391	$ 180,643
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	$ 524,013	$ 442,381
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio	11.70%	10.70%
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 201,543	$ 185,874
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	$ 285,520	$ 237,506
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	6.40%	5.80%
FirstBank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to risk-weighted assets), Actual Amount	$ 561,327	$ 466,102
Total Capital (to risk-weighted assets), Actual Ratio	12.50%	11.30%
Total Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 359,249	$ 329,984
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	$ 443,448	$ 381,544
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	9.90%	9.30%
Total Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Amount	$ 449,062	$ 412,480
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	$ 532,395	$ 442,061
Tier 1 Capital (to risk-weighted assets), Actual Ratio	11.90%	10.70%
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 268,434	$ 247,422
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	$ 352,320	$ 298,968
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	7.90%	7.30%
Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions Amount	$ 357,913	$ 329,896
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	$ 532,395	$ 442,061
Tier 1 Capital (to average assets), Actual Ratio	10.90%	9.80%
Tier 1 Capital (to average assets), For capital adequacy purposes, Amount	$ 195,374	$ 180,987
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	$ 244,218	$ 226,234
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	$ 532,395	$ 442,061
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio	11.90%	10.70%
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 201,326	$ 185,567
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	$ 285,212	$ 237,113
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	6.40%	5.80%
Common Equity Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Amount	$ 290,804	$ 268,041
Common Equity Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Ratio	6.50%	6.50%

Employee benefit plans - Additi

Employee benefit plans - Additional Information (Details)	Dec. 31, 2019	Jun. 28, 2016	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)	Dec. 31, 2014USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discretionary contribution percentage			25.00%	25.00%
Maximum percentage of amount to be contributed by the employer			6.00%
Matching and profit sharing vesting period			5 years
Contribution provided by the bank to the plan			$ 2,211,000	$ 2,344,000	$ 1,379,000
Post retirement benefits payable			1,260,000	1,510,000
Expense related to plans			4,000	4,000	30,000
Payments to participants			191,000	191,000	205,000
Cash surrender value on bank owned life insurance			11,115,000	10,873,000
Cash value income			158,000	164,000	181,000
Stock split ratio		100
Deferred compensation			$ 3,836,000	$ 5,301,000
Number of units remaining in equity based incentive plan for cash settlement | shares			29,172,000	67,470,000
Salaries, commissions and employee benefits			$ 136,892,000	$ 130,005,000	$ 113,486,000
Deferred Compensation Plans and Agreements
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments to participants			1,818,000	5,163,000
Other liabilities			993,000	2,346,000
Salaries, commissions and employee benefits			$ 3,787,000	$ 3,685,000
Deferred Compensation Plans and Agreements | 2010 EBI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting period			5 years
Employee retirement age under EBI plan			65 years
Valuation of unit by percentage of assets			7.50%
Deferred Compensation Plans and Agreements | 2012 EBI Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee retirement age under EBI plan			65 years
Fair market value per EBI | $ / shares			$ 21.4085
IPO price (USD per share) | $ / shares			19
Deferred Compensation Plans and Agreements | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
IPO price (USD per share) | $ / shares			$ 19
Deferred compensation						$ 3,000,000
Deferred stock units issued (in shares) | shares			157,895
Deferred Compensation Plans and Agreements | Chief Executive Officer | Scenario, Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred stock units conversion basis	1-for-1

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Vested and Unvested Restricted Stock Units Outstanding (Details) - Restricted Stock Units (RSUs)	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units Outstanding, Balance, beginning of period (in shares) | shares	1,214,109,000
Restricted Stock Units Outstanding, Conversion of deferred compensation plan (in shares) | shares	0
Restricted Stock Units Outstanding, Conversion of equity based incentive (EBI) plans (in shares) | shares	0
Restricted Stock Units Outstanding, Grants (in shares) | shares	149,734,000
Restricted Stock Units Outstanding, Released and distributed (vested) (in shares) | shares	(207,478,000)
Restricted Stock Units Outstanding, Forfeited/expired (in shares) | shares	(16,150,000)
Restricted Stock Units Outstanding, Balance, end of period (in shares) | shares	1,140,215,000
Weighted Average Grant Date Fair Value, Balance, beginning of period (USD per share) | $ / shares	$ 19.97
Weighted Average Grant Date Fair Value, Conversion of deferred compensation plan (USD per share) | $ / shares	0
Weighted Average Grant Date Fair Value, Conversion of equity based incentive (EBI) plans (USD per share) | $ / shares	0
Weighted Average Grant Date Fair Value, Grants (USD per share) | $ / shares	39.55
Weighted Average Grant Date Fair Value, Released and distributed (vested) (USD per share) | $ / shares	21.99
Weighted Average Grant Date Fair Value, Forfeited/expired (USD per share) | $ / shares	25.45
Weighted Average Grant Date Fair Value, Balance, end of period (USD per share) | $ / shares	$ 21,960

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to stock grants and vesting of restricted stock units	$ 7,207,000	$ 6,760,000	$ 4,693,000
Dividends declared not paid on restricted stock units	226,000	0	0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock units vested and released	(4,562,000)	(2,202,000)	(2,997,000)
Compensation cost related to stock grants and vesting of restricted stock units	7,436,000	8,184,000	4,693,000
One-time expense for modification of vesting terms	249,000
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	645,000	551,000	$ 0
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	$ 12,371,000	$ 12,950,000
Expected weighted-average period to be recognized	2 years 2 months 12 days	2 years 9 months 18 days
Dividends declared not paid on restricted stock units	$ 226,000
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			$ 25,000,000
Shares issued under plan (in shares)	28,609	18,658
Number of shares reserved for issuance (in shares)	2,432,356	2,460,965

Related party transactions - Sc

Related party transactions - Schedule of Loans Analysis to Executive Officers, Certain Management, Bank Directors and Their Affiliates (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Related Party Transactions [Abstract]
Loans outstanding, Beginning balance	$ 21,012
New loans and advances	21,828
Repayments	(10,576)
Loans outstanding, Ending balance	$ 32,264

Related party transactions - Ad

Related party transactions - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Unfunded commitments	$ 0	$ 2
Deposits from related parties	287,156	110,465
Aviation Time Sharing Agreement
Related Party Transaction [Line Items]
Payments to related party	208	176
Initial Public Offering
Related Party Transaction [Line Items]
Placement agent and other offering costs	671
Certain Executive Officers, Certain Management and Directors and Their Associates
Related Party Transaction [Line Items]
Unfunded commitments	15,000	4,672
Director
Related Party Transaction [Line Items]
Unamortized leasehold improvements	116		$ 137
Lease expense	516	504	$ 522
Amount of investment held by the company	$ 29	$ 200

Subsequent Event - Additional I

Subsequent Event - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Mortgage servicing rights sold		$ 39,428	$ 11,686	$ 34,118
Subsequent Event
Subsequent Event [Line Items]
Mortgage servicing rights sold	$ 29,416
Mortgage loans serviced related to bulk sale of mortgage servicing rights	$ 2,034,374

Uncategorized Items - fbk-20181

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