FB Financial (FBK) 10-K 16 Mar 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Mar. 12, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	FBK
Entity Registrant Name	FB Financial Corp
Entity Central Index Key	1,649,749
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
Entity Common Stock, Shares Outstanding		30,650,758
Entity Public Float			$ 417,600,000

Consolidated balance sheets

Consolidated balance sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 29,831	$ 50,157
Federal funds sold	66,127	13,037
Interest bearing deposits in financial institutions	23,793	73,133
Cash and cash equivalents	119,751	136,327
Investments:
Available-for-sale securities, at fair value	543,992	582,183
Federal Home Loan Bank stock, at cost	11,412	7,743
Loans held for sale, at fair value	526,185	507,442
Loans	3,166,911	1,848,784
Less: allowance for loan losses	24,041	21,747
Net loans	3,142,870	1,827,037
Premises and equipment, net	81,577	66,651
Other real estate owned, net	16,442	7,403
Interest receivable	13,069	7,241
Mortgage servicing rights	76,107	32,070
Goodwill	137,190	46,867
Core deposit and other intangibles, net	14,902	4,563
Other assets	44,216	51,354
Total assets	4,727,713	3,276,881
Demand deposits
Noninterest-bearing	888,200	697,072
Interest-bearing	1,909,546	1,449,382
Savings deposits	178,320	134,077
Customer time deposits	602,628	389,500
Brokered and internet time deposits	85,701	1,531
Total time deposits	688,329	391,031
Total deposits	3,664,395	2,671,562
Securities sold under agreements to repurchase	14,293	21,561
Short-term borrowings	190,000	150,000
Long-term debt	143,302	44,892
Accrued expenses and other liabilities	118,994	58,368
Total liabilities	4,130,984	2,946,383
Shareholders' equity:
Common stock, $1 par value per share; 75,000,000 shares authorized; 30,535,517 and 24,107,660 shares issued and outstanding at December 31, 2017 and December 31, 2016, respectively	30,536	24,108
Additional paid-in capital	418,596	213,480
Retained earnings	147,449	93,784
Accumulated other comprehensive income (loss), net	148	(874)
Total shareholders' equity	596,729	330,498
Total liabilities and shareholders' equity	$ 4,727,713	$ 3,276,881

Consolidated balance sheets (Pa

Consolidated balance sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	30,535,517	24,107,660
Common stock, shares outstanding	30,535,517	24,107,660

Consolidated statements of inco

Consolidated statements of income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest income:
Interest and fees on loans	$ 153,969	$ 105,865	$ 87,723
Interest on securities
Taxable	10,084	10,646	11,783
Tax-exempt	4,006	3,372	2,808
Other	1,554	611	468
Total interest income	169,613	120,494	102,782
Deposits
Demand and savings accounts	9,272	5,413	4,733
Time deposits	3,759	1,929	1,559
Short-term borrowings	42	121	712
Long-term debt	3,269	2,081	1,906
Total interest expense	16,342	9,544	8,910
Net interest income	153,271	110,950	93,872
Provision for loan losses	(950)	(1,479)	(3,064)
Net interest income after provision for loan losses	154,221	112,429	96,936
Noninterest income:
Mortgage banking income	116,933	117,751	70,190
Service charges on deposit accounts	7,787	8,009	7,389
ATM and interchange fees	8,784	7,791	6,536
Investment services and trust income	3,949	3,337	3,260
Bargain purchase gain			2,794
Gain from securities, net	285	4,407	1,844
Gain (loss) on sales or write-downs of other real estate owned	774	1,282	(317)
Loss from other assets	(664)	(103)	(393)
Other income	3,733	2,211	1,077
Total noninterest income	141,581	144,685	92,380
Noninterest expenses:
Salaries, commissions and employee benefits	130,355	113,992	84,214
Occupancy and equipment expense	13,836	12,611	10,777
Legal and professional fees	5,737	3,514	3,355
Data processing	6,488	4,181	2,053
Merger and conversion	19,034	3,268	3,543
Amortization of core deposit and other intangibles	1,995	2,132	1,731
Amortization of mortgage servicing rights		8,321	2,601
Impairment of mortgage servicing rights		4,678	194
Loss on sale of mortgage servicing rights	249	4,447
Regulatory fees and deposit insurance assessments	2,049	1,952	2,190
Software license and maintenance fees	1,873	2,874	1,986
Advertising	12,957	10,608	8,062
Other expense	27,744	22,212	17,786
Total noninterest expense	222,317	194,790	138,492
Income before income taxes	73,485	62,324	50,824
Income tax expense (Note 15)	21,087	21,733	2,968
Net income	$ 52,398	$ 40,591	$ 47,856
Weighted average shares of common stock outstanding
Basic	27,627,228	19,165,182	17,180,000
Fully diluted	28,207,602	19,312,174	17,180,000
Earnings per share
Basic	$ 1.90	$ 2.12	$ 2.79
Fully diluted	$ 1.86	$ 2.10	$ 2.79
Pro Forma (C Corporation basis) (Note 15):
Income tax expense	$ 21,087	$ 22,902	$ 17,829
Net income	$ 52,398	$ 39,422	$ 32,995
Pro Forma Earnings per share
Basic	$ 1.90	$ 2.06	$ 1.92
Fully diluted	$ 1.86	$ 2.04	$ 1.92

Consolidated statements of comp

Consolidated statements of comprehensive income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 52,398	$ 40,591	$ 47,856
Other comprehensive income, net of tax:
Net change in unrealized loss (gain) in available-for-sale securities, net of taxes of $493, $5,309 and $(71)	1,162	778	(1,057)
Reclassification adjustment for (gain) on sale of securities included in net income, net of tax expenses of $112, $298, and $91	(173)	(4,109)	(1,753)
Net change in unrealized gain in hedging activities, net of taxes of $442, $-, and $-	685
Comprehensive income	$ 54,072	$ 37,260	$ 45,046

Consolidated statements of com6

Consolidated statements of comprehensive income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net change in unrealized gain (loss) in available for sale securities, tax	$ 493	$ 5,309	$ (71)
Reclassification adjustment for gain on sale of securities included in net income, tax	112	$ 298	$ 91
Net change in unrealized gain in hedging activities, tax	$ 442

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, 2014	$ 215,228	$ 17,180	$ 94,544	$ 98,237	$ 5,267
Net income	47,856			47,856
Other comprehensive income (loss), net of taxes	(2,810)				(2,810)
Cash dividends declared	(23,600)			(23,600)
Balance at Dec. 31, 2015	236,674	17,180	94,544	122,493	2,457
Net income	40,591			40,591
Other comprehensive income (loss), 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)
Initial fair value election on mortgage servicingrights, net of taxes of $396 (See Note 1)	615			615
Net income	52,398			52,398
Other comprehensive income (loss), net of taxes	1,674				1,674
Reclassification of the income tax effects of the TaxCuts and Jobs Act to Retained earnings (Note 15)				652	(652)
Common stock issued, net of offering costs	152,721	4,807	147,914
Common stock issued in conjunction withacquisition of the Clayton Banks, net ofissuance costs (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

Consolidated Statements of Cha8

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Stockholders Equity [Abstract]
Cash dividends declared, per share	$ 396	$ 4.03	$ 1.37

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 52,398	$ 40,591	$ 47,856
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation expense	4,316	3,995	3,283
Amortization of core deposit and other intangibles	1,995	2,132	1,731
Capitalization of mortgage servicing rights	(58,984)	(46,070)	(26,474)
Amortization of mortgage servicing rights		8,321	2,601
Change in fair value of mortgage servicing rights	4,023
Impairment of mortgage servicing rights		4,678	194
Stock-based compensation expense	6,760	4,693
Provision for loan losses	(950)	(1,479)	(3,064)
Provision for mortgage loan repurchases	810	512	1,375
Accretion of yield on purchased loans	(5,419)	(3,538)	(493)
Accretion of discounts and amortization of premiums on securities, net	2,693	2,326	1,474
Bargain purchase gain			(2,794)
Gain from securities, net	(285)	(4,407)	(1,844)
Originations of loans held for sale	(6,331,458)	(4,671,561)	(2,757,463)
Proceeds from sale of loans held for sale	6,408,198	4,534,837	2,739,914
Gain on sale and change in fair value of loans held for sale	(107,189)	(115,485)	(65,947)
Loss (gain) on sale of mortgage servicing rights	249	(3,406)
Net gain or write-downs of other real estate owned	(774)	(1,282)	317
Gain on other assets	664	103	393
Provision for deferred income taxes	6,458	9,257	1,647
Changes in:
Other assets and interest receivable	6,478	(24,730)	(1,301)
Accrued expenses and other liabilities	47,627	15,312	12,820
Net cash provided by (used in) operating activities	37,610	(245,201)	(45,775)
Activity in available-for-sale securities:
Sales	94,743	271,148	194,611
Maturities, prepayments and calls	83,344	104,368	103,233
Purchases	(81,353)	(316,384)	(164,864)
Net increase in loans	(241,379)	(127,949)	(206,670)
Proceeds from sale of mortgage servicing rights	11,686	34,118
Purchases of premises and equipment	(4,545)	(4,784)	(5,918)
Proceeds from the sale of premises and equipment	39	46	17
Proceeds from the sale of other real estate owned	5,438	6,696	3,774
Net cash (paid) received in business combination	(135,141)		23,995
Net cash used in investing activities	(267,168)	(32,741)	(51,822)
Cash flows from financing activities:
Net increase in demand and savings deposits	14,682	167,616	306,360
Net (decrease) increase in time deposits	(1,367)	65,472	(37,671)
Net decrease in securities sold under agreements to repurchase	(7,268)	(83,572)	(8,361)
Increase (decrease) in short-term borrowings	23,767	132,000	(81,378)
Increase (decrease) in long-term debt	29,812	(11,724)	(8,234)
Net proceeds from sale of common stock	153,356	116,054
Dividends paid		(69,300)	(25,350)
Net cash provided by financing activities	212,982	316,546	145,366
Net change in cash and cash equivalents	(16,576)	38,604	47,769
Cash and cash equivalents at beginning of the period	136,327	97,723	49,954
Cash and cash equivalents at end of the period	119,751	136,327	97,723
Supplemental cash flow information:
Interest paid	15,470	9,474	8,985
Taxes paid	22,292	1,307	1,754
Supplemental noncash disclosures:
Transfers from loans to other real estate owned	3,605	2,724	4,085
Transfers from other real estate owned to loans	256	1,548	785
Transfers from loans held for sale to loans	11,706	17,963	$ 5,045
Rebooked GNMA loans under optional repurchase program	43,035
Stock consideration paid in business combination	52,284
Conversion of cash-settled to stock settled compensation		$ 5,388
Trade date payable - securities	348
Fair value election of mortgage servicing rights	$ 1,011

Basis of Presentation

Basis of Presentation	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Basis of presentation	Note (1)—Basis of presentation: (A) Organization: FB Financial Corporation (the “Company”), a bank holding company, and its wholly-owned subsidiary, FirstBank (the “Bank”), are engaged in the business of banking and headquartered in Nashville, Tennessee. The Bank provides a full range of financial services to individual, corporate and public customers throughout Tennessee, north Alabama, and north Georgia and operates a national mortgage business with office locations across the Southeast, which primarily originate loans to be sold in the secondary market. On September 18, 2015, the Company completed its acquisition of Northwest Georgia Bank (“NWGB”), which added locations in Ringgold, Georgia and Catoosa County, Georgia and additional locations in Chattanooga, Tennessee. On July 31, 2017, the Bank completed its previously announced acquisitions of Clayton Bank and Trust and American City Bank, headquartered in Knoxville, Tennessee and Tullahoma, Tennessee, respectively. The financial condition and results of operation for the acquired banks are included in the Company’s consolidated financial statements since the acquisition dates. See Note 2, “Mergers and acquisitions” in the notes to the consolidated financial statements for further details regarding the terms and conditions of these acquisitions. Effective March 8, 2016, the company formerly known as First South Bancorp, Inc. legally changed its name to FB Financial Corporation. 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. 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 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. As of December 31, 2017 and 2016, the Company is considered a “controlled company” and is controlled by the Company’s Executive Chairman and former sole shareholder, James W. Ayers. The Company qualifies as an “emerging growth company” as defined by the Jumpstart Our Business Startups Act (“JOBS Act”). 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 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 and 35.08% for the year ended December 31, 2015, as if it had been a C Corporation during those periods. On May 26, 2017, the Company entered into Securities Purchase Agreements (the “Securities Purchase Agreements”) with accredited investors (the “Purchasers”) pursuant to which the Company agreed to sell in a private placement (the “Private Placement”) an aggregate of 4,806,710 shares of the Company’s common stock, par value $1.00 (the “Private Placement Shares”), at a purchase price of $33.00 per share. Total proceeds received from the sale of such Private Placement Shares, net of placement agent and other offering costs of $5,901, were approximately $152,721. (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. In connection with the determination of the estimated fair value of other real estate owned and impaired loans, management obtains independent appraisals for significant properties. The consolidated financial statements include the accounts of the Company, the Bank, and its’ wholly-owned subsidiaries, FirstBank Insurance, Inc., First Holdings, Inc., RE Holdings, 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, repurchase agreements, federal funds sold, and short-term 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. Equity securities with readily determinable fair values are classified as available-for-sale. Securities available-for-sale are carried at fair value, with unrealized holding gains and losses reported in other comprehensive income, net of applicable taxes. 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 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 year ended December 31, 2017, the Company recorded OTTI amounting to $945 as discussed in Note 4. (F) 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 $9,111, $(2,289), and $2,257 resulting from fair value changes of these mortgage loans were recorded in income during 2017, 2016, and 2015, 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 2017, 2016 and 2015, the Bank transferred approximately $11,706, $18,000, and $5,000, respectively, of residential mortgage loans into its portfolio. The loans are transferred into the portfolio at fair value at the date of transfer. 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 and the expected benefit of the potential buy-back is more than trivial, 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. These loans are reported as loans held for sale with the offsetting liability being reported in other liabilities. At December 31, 2017, rebooked GNMA loans held for sale amounted to $43,035. Amounts related to prior periods were not significant. 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 . (G) 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. Interest on loans is recognized as income by using the simple interest method on daily balances of the principal amount outstanding. 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. (H) 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 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. (I) Business combinations, accounting for acquired loans and related assets: 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 the 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. (J) 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. (K) 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. After foreclosure, valuations are periodically performed by management and the asset is carried at the lower of carrying amount or fair value less costs to sell. Revenue and expenses from operations are included in other noninterest income and noninterest expenses. Losses due to the valuation of the property are included in (gain) loss on sales or write-downs of foreclosed assets. (L) 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. 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 the lower of amortized cost or fair value. 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. Mortgage servicing rights were carried at amortized cost less the reserve for impairment at December 31, 2016. 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 and $194 were recognized in earnings during the years ended December 31, 2016 and 2015, respectively. 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 January 1, 2017. Subsequent changes in fair value are recorded in earnings in Mortgage banking income. (M) 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. (N) 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. As discussed in Note 21, the Company realigned its segment reporting structure during the year ended December 31, 2016. As a result, our reporting units have been adjusted to reflect this change from geographic-based reporting units to business segment reporting units. 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 as 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 quantitative annual assessment for impairment performed as of December 31, 2017. Additionally, qualitative and quantitative assessments were performed for the years ended December 31, 2016 and 2015, respectively, and no impairment was identified. 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 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. (O) 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 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 and 35.08% for the year ended December 31, 2015, as if it had been a C corp

Mergers and acquisitions

Mergers and acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Mergers and acquisitions	Note (2)—Mergers and acquisitions: Clayton Bank and Trust and American City Bank On July 31, 2017, the Bank completed its previously-announced merger with Clayton Bank and Trust (“CBT”) and American City Bank (“ACB” and together with CBT, the “Clayton Banks”), pursuant to the Stock Purchase Agreement with Clayton HC, Inc., a Tennessee corporation (“Seller”), and James L. Clayton, the majority shareholder of Seller, dated February 8, 2017, as amended on May 26, 2017, with a purchase price of approximately $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 $19,034 in merger and conversion expenses during the year ended December 31, 2017. This amount includes $10,000 contributed to a charitable foundation established to invest in the communities across the markets of the Clayton Banks. 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 for 2017 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 has 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 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 Non-interest bearing deposits 309,464 Borrowings 84,831 Accrued expenses and other liabilities 5,245 Total liabilities $ 1,069,594 Net assets acquired (excluding goodwill recognized) $ 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 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 table presents the fair value of acquired purchase credit impaired loans accounted for in accordance with ASC 310-30 from the Clayton Banks as of the July 31, 2017 acquisition date: July 31, 2017 Contractually-required principal and interest $ 115,448 Nonaccretable difference (12,430 ) Best estimate of contractual cash flows expected to be collected 103,018 Accretable yield (18,868 ) Fair value $ 84,150 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 Northwest Georgia Bank On September 18, 2015, the Bank completed its acquisition of Northwest Georgia Bank (“NWGB”), a bank headquartered in Ringgold, Georgia, pursuant to that certain Agreement and Plan of Merger dated April 27, 2015 by and between the Bank and NWGB. Pursuant to the Agreement and Plan of Merger, NWGB was merged with and into the Bank, with the Bank as the surviving entity. Prior to the acquisition, NWGB operated six banking locations in Georgia and Tennessee. The acquisition of NWGB allowed the Company to further its strategic initiatives by expanding its geographic footprint into certain markets of Georgia and Tennessee. The Company acquired NWGB in a $1,500 cash purchase. The Company recorded a bargain purchase gain of $2,794 and a core deposit intangible asset of $4,931. The fair value of the core deposit intangible is being amortized on a straight-line basis over the estimated useful life, of approximately 10 years at the time of acquisition. For income tax purposes, the acquisition of NWGB was treated as an asset purchase. As an asset purchase for income tax purposes, the carrying value of assets and liabilities for NWGB are the same for both financial reporting and income tax purposes; therefore, no deferred taxes were recorded at the date of acquisition except for a $191 deferred tax liability recorded for the bargain purchase gain. Additionally, this treatment allows for the deductibility for income tax purposes of the core deposit intangible recorded for the NWGB merger over 15 years, net of the bargain purchase gain. In connection with the transaction, the Company incurred $3,268 and $3,543 in merger and conversion expenses during the years ended December 31, 2016 and 2015, respectively. The following tables present the final estimated fair value of net assets acquired as of the September 18, 2015 acquisition date and the consideration paid and an allocation of the purchase price to net assets acquired: As of September 18, 2015 As Recorded by FB Financial Corporation Assets Cash and cash equivalents $ 25,495 Investment securities 133,124 FHLB stock 1,154 Loans 78,565 Allowance for loan losses - Premises and equipment 15,343 Other real estate owned 5,002 Intangibles, net 4,931 Other assets 8,735 Total assets $ 272,349 Liabilities Interest-bearing deposits $ 213,126 Non-interest bearing deposits 33,090 Borrowings 20,378 Accrued expenses and other liabilities 1,461 Total liabilities $ 268,055 Net assets acquired (excluding goodwill recognized) $ 4,294 Purchase price: Cash Consideration paid $ 1,500 Allocation of consideration paid: Fair value of net assets acquired including identifiable intangible assets 4,294 Bargain purchase gain $ 2,794 (1) (1) The bargain purchase gain resulting from the merger has been recognized in the Banking operating segment during the year ended December 31, 2015. The following unaudited pro forma condensed consolidated financial information presents the results of operations for the year ended December 31, 2015 as though the acquisition had been completed as of January 1, 2014. The unaudited estimated pro forma information combines the historical results of NWGB with the Company’s historical consolidated results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the periods presented. The pro forma information is not indicative of what would have occurred had the acquisition taken place on January 1, 2014 and does not include the effect of all cost-saving or revenue-enhancing strategies. Year Ended December 31, 2015 Net interest income $ 102,290 Total revenues $ 191,002 Net income $ 46,042

Cash and Cash Equivalents Conce

Cash and Cash Equivalents Concentrations	12 Months Ended
	Dec. 31, 2017
Risks And Uncertainties [Abstract]
Cash and Cash Equivalents Concentrations	Note (3)—Cash and cash equivalents concentrations: As of December 31, 2017 and 2016, the Bank and its subsidiaries had concentrations of credit risk with financial institutions in the form of correspondent bank accounts which are included in cash and cash equivalents and interest bearing deposits. Correspondent bank balances are maintained for check clearing and other services. The Bank had amounts due from their correspondent institutions at December 31, 2017 and 2016, as follows: Bank Name 2017 2016 First Tennessee Bank, N.A. $ 2,477 $ 26,381 Federal Reserve Bank of Atlanta 22,103 61,623 JP Morgan Chase Bank, N.A. 3,138 2,272 Federal Home Loan Bank of Cincinnati 1,489 11,409 Fifth Third Bank 1,558 1,598 BBVA Compass 1,065 987 Zions Bank, N.A. 500 501 Servis First Bank 350 350 SunTrust Bank 230 232 PNC Bank, N.A. 211 213 First National Bankers Bank 200 200 US Bank, N.A. 98 — Wells Fargo Bank, N.A. 88 — Alostar Bank of Commerce 538 — Synovus Bank 291 1,062 $ 34,336 $ 106,828 Interest is earned on balances at the Federal Reserve Bank and at the Federal Home Loan Bank.

Investment securities

Investment securities	12 Months Ended
	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Investment securities	Note (4)—Investment securities: The amortized cost of securities and their fair values at December 31, 2017 and 2016 are shown below: December 31, 2017 Amortized cost Gross unrealized gains Gross unrealized losses Fair Value 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 December 31, 2016 Amortized cost Gross unrealized gains Gross unrealized losses Fair Value Securities Available-for-Sale Debt securities U.S. government agency securities $ 998 $ — $ (13 ) $ 985 Mortgage-backed securities - residential 450,874 939 (7,905 ) 443,908 Municipals, tax exempt 116,034 3,003 (2,114 ) 116,923 Treasury securities 11,809 — (52 ) 11,757 Total debt securities 579,715 3,942 (10,084 ) 573,573 Equity securities 8,744 1 (135 ) 8,610 Total securities available-for-sale $ 588,459 $ 3,943 $ (10,219 ) $ 582,183 Securities pledged at December 31, 2017 and 2016 had a carrying amount of $337,604 and $390,814, respectively, and were pledged to secure Federal Home Loan Bank advances, a Federal Reserve Bank line of credit, public deposits and repurchase agreements. The amortized cost and fair value of debt securities by contractual maturity at December 31, 2017 and 2016 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, 2017 2016 Available-for-sale Available-for-sale Amortized cost Fair value Amortized cost Fair value Due in one year or less $ 905 $ 925 $ 9,290 $ 9,352 Due in one to five years 28,332 28,878 25,520 26,340 Due in five to ten years 19,218 19,588 31,122 32,248 Due in over ten years 67,016 68,098 62,909 61,725 115,471 117,489 128,841 129,665 Mortgage-backed securities - residential 425,557 418,781 450,874 443,908 Total debt securities $ 541,028 $ 536,270 $ 579,715 $ 573,573 Sales of available-for-sale securities were as follows: Year Ended December 31, 2017 2016 Proceeds from sales $ 94,743 $ 271,148 Gross realized gains 1,277 4,755 Gross realized losses 48 348 Other-than-temporary-impairment 945 — The Company also recognized $1 on gains related to the early call of available for sale securities during the year ended December 31, 2017. The following tables show gross unrealized losses at December 31, 2017 and 2016, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position: 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 December 31, 2016 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 $ 985 $ 13 $ — $ — $ 985 $ 13 Mortgage-backed securities - residential 390,595 7,230 19,073 675 409,668 7,905 Municipals, tax exempt 43,132 2,114 — — 43,132 2,114 Treasury securities 10,256 52 — — 10,256 52 Total debt securities 444,968 9,409 19,073 675 464,041 10,084 Equity securities — — 3,126 135 3,126 135 $ 444,968 $ 9,409 $ 22,199 $ 810 $ 467,167 $ 10,219 As of December 31, 2017 and 2016, the Company’s securities portfolio consisted of 294 and 329 securities, 124 and 151 of which were in an unrealized loss position, respectively. The Company evaluates securities with unrealized losses for other-than-temporary impairment (OTTI) on a quarterly basis. Impairment is assessed at the individual security level. 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. When impairment of an equity security is considered to be other-than-temporary, the security is written down to its fair value and an impairment loss is recorded as a loss within noninterest income. The Company evaluated the near-term prospects of the equity investments in relation to the severity and duration of the impairment. Based on that evaluation, the Company concluded that it was probable that there had been adverse cash flows for one of the equity investments held. Additionally, the Company does not intend to hold the security long-term and it is unlikely the fair value would be recovered. Credit impairment losses of $945 and $0 was recognized during the years ended December 31, 2017 and 2016, respectively. Changes in the amount of credit related losses recognized in earnings for which OTTI has been recognized are as follows: Balance as of January 1, 2017 $ — Additions related to credit losses for which OTTI was not previously recognized (945 ) Reductions for securities sold during the period — Reductions for securities where there is an intent to sell or requirement to sell — Increases in credit loss for which OTTI was previously recognized — Reductions for increases in cash flows expected to be collected — Balance as of December 31, 2017 $ (945 )

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Loans and allowance for loan losses	Note (5)—Loans and allowance for loan losses: Loans outstanding at December 31, 2017 and 2016, by major lending classification are as follows: December 31, 2017 2016 Commercial and industrial $ 715,075 $ 386,233 Construction 448,326 245,905 Residential real estate: 1-to-4 family mortgage 480,989 294,924 Residential line of credit 194,986 177,190 Multi-family mortgage 62,374 44,977 Commercial real estate: Owner occupied 495,872 357,346 Non-owner occupied 551,588 267,902 Consumer and other 217,701 74,307 Gross loans 3,166,911 1,848,784 Less: Allowance for loan losses (24,041 ) (21,747 ) Net loans $ 3,142,870 $ 1,827,037 As of December 31, 2017 and 2016, $968,567 and $565,717, respectively, of 1-to-4 family and multifamily mortgage loans and loans held for sale were pledged to the Federal Home Loan Bank of Cincinnati securing advances against the Bank’s line. As of December 31, 2017 and 2016, $724,312 and $1,072,118, respectively, of commercial and industrial , construction, residential, real estate, commercial real estate, and consumer and other loans were pledged to the Federal Reserve under the Borrower-in-Custody program. As of December 31, 2017 and 2016, 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 Year Ended December 31, 2017 2016 2015 Balance at December 31, 2016 $ (2,444 ) $ (1,637 ) $ — Additions through the acquisition of the Clayton Banks (18,868 ) — (1,991 ) Principal reductions and other reclassifications from nonaccretable difference (1,841 ) (3,438 ) (100 ) Recoveries (23 ) — — Accretion 5,299 2,631 454 Other changes 195 — — Balance at December 31, 2017 $ (17,682 ) $ (2,444 ) $ (1,637 ) 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, 2017, 2016 and 2015: 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 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, 2015 Beginning balance - December 31, 2014 $ 6,600 $ 3,721 $ 6,364 $ 2,790 $ 184 $ 6,075 $ 2,641 $ 655 $ 29,030 Provision for loan losses (624 ) 149 (1,521 ) (645 ) 127 (1,366 ) (307 ) 1,123 (3,064 ) Recoveries of loans previously charged-off 112 1,354 161 286 — 35 342 548 2,838 Loans charged off (953 ) (81 ) (828 ) (230 ) — (1,062 ) (54 ) (1,136 ) (4,344 ) Ending balance - December 31, 2015 $ 5,135 $ 5,143 $ 4,176 $ 2,201 $ 311 $ 3,682 $ 2,622 $ 1,190 $ 24,460 The following table provides the allocation of the allowance for loan losses by loan category broken out between loans individually evaluated for impairment and loans collectively evaluated for impairment as of December 31, 2017, 2016 and 2015: 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 December 31, 2015 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 $ 89 $ 5 $ 66 $ — $ — $ 74 $ 739 $ — $ 973 Collectively evaluated for impairment 5,046 5,138 4,110 2,201 311 3,608 1,883 1,190 23,487 Acquired with deteriorated credit quality — — — — — — — — — Ending balance- December 31, 2015 $ 5,135 $ 5,143 $ 4,176 $ 2,201 $ 311 $ 3,682 $ 2,622 $ 1,190 $ 24,460 The following table provides the amount of loans by loan category broken between loans individually evaluated for impairment and loans collectively evaluated for impairment as of December 31, 2017, 2016 and 2015: 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 December 31, 2015 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 $ 1,499 $ 2,866 $ 3,686 $ — $ 1,074 $ 3,000 $ 3,451 $ — $ 15,576 Collectively evaluated for impairment 316,418 228,445 284,190 171,526 58,400 329,569 198,741 77,623 1,664,912 Acquired with deteriorated credit quality 874 6,859 2,828 — 36 5,095 5,679 4 21,375 Ending balance- December 31, 2015 $ 318,791 $ 238,170 $ 290,704 $ 171,526 $ 59,510 $ 337,664 $ 207,871 $ 77,627 $ 1,701,863 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, in 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 table shows credit quality indicators by portfolio class at December 31, 2017 and 2016: 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 December 31, 2016 Pass Watch Substandard Total Loans, excluding purchased credit impaired loans Commercial and industrial $ 351,046 $ 31,074 $ 3,635 $ 385,755 Construction 236,588 4,612 386 241,586 Residential real estate: 1-to-4 family mortgage 277,948 6,945 7,924 292,817 Residential line of credit 173,011 1,875 2,304 177,190 Multi-family mortgage 43,770 152 1,027 44,949 Commercial real estate: Owner occupied 338,698 10,459 4,407 353,564 Non-owner occupied 249,877 10,273 2,412 262,562 Consumer and other 73,454 417 432 74,303 Total loans, excluding purchased credit impaired loans $ 1,744,392 $ 65,807 $ 22,527 $ 1,832,726 Purchased credit impaired loans Commercial and industrial $ — $ — $ 478 $ 478 Construction — — 4,319 4,319 Residential real estate: 1-to-4 family mortgage — — 2,107 2,107 Residential line of credit — — — — Multi-family mortgage — — 28 28 Commercial real estate: Owner occupied — — 3,782 3,782 Non-owner occupied — — 5,340 5,340 Consumer and other — — 4 4 Total purchased credit impaired loans $ — $ — $ 16,058 $ 16,058 Total loans $ 1,744,392 $ 65,807 $ 38,585 $ 1,848,784 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, 2017 or December 31, 2016 as the carrying value of the respective loan or pool of loans cash flows were considered estimable and probable of collection. Therefore, interest revenue, through accretion of the difference between the carrying value of the loans and the expected cash flows, is being recognized on all PCI loans. Accretion of interest income amounting to $5,299, $2,631 and $454 was recognized on purchased credit impaired loans during the years ended December 31, 2017, 2016 and 2015, respectively. This includes both the contractual interest income 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 $5,419, 3,538 and $493 for the years ended December 31, 2017, 2016 and 2015, respectively. The following table provides 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, 2017 and 2016: 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 December 31, 2016 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 $ 262 $ 127 $ 1,297 $ 384,069 $ 478 $ 386,233 Construction 441 17 254 240,874 4,319 245,905 Residential real estate: 1-to-4 family mortgage 3,130 697 2,289 286,701 2,107 294,924 Residential line of credit 1,139 433 601 175,017 — 177,190 Multi-family mortgage — — — 44,949 28 44,977 Commercial real estate: Owner occupied 186 — 2,007 351,371 3,782 357,346 Non-owner occupied 158 — 2,251 260,153 5,340 267,902 Consumer and other 433 55 30 73,785 4 74,307 Total $ 5,749 $ 1,329 $ 8,729 $ 1,816,919 $ 16,058 $ 1,848,784 Impaired loans recognized in conformity with ASC 310 at December 31, 2017 and 2016, segregated by class, were as follows: 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 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, 2016 Recorded investment Unpaid principal Related allowance With a related allowance recorded: Commercial and industrial $ 854 $ 854 $ 135 Construction — — — Residential real estate: 1-to-4 family mortgage 103 369 23 Residential line of credit — — — Multi-family mortgage — — — Commercial real estate: Owner occupied 635 654 113 Non-owner occupied 1,151 1,678 242 Consumer and other 1 1 — Total $ 2,744 $ 3,556 $ 513 With no related allowance recorded: Commercial and industrial $ 622 $ 746 $ — Construction 2,686 2,694 — Residential real estate: 1-to-4 family mortgage 2,368 2,370 — Residential line of credit 311 321 — Multi-family mortgage 1,027 1,027 — Commercial real estate: Owner occupied 2,117 3,205 — Non-owner occupied 1,050 1,781 — Consumer and other 26 26 — Total $ 10,207 $ 12,170 $ — Total impaired loans $ 12,951 $ 15,726 $ 513 December 31, 2017 2016 2015 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 $ 454 $ 2 $ 994 $ 17 $ 1,269 $ 22 Construction — — 154 — 517 3 Residential real estate: 1-to-4 family mortgage 149 9 1,750 1 2,345 199 Residential line of credit — — — — — — Multi-family mortgage — — — — 468 — Commercial real estate: Owner occupied 740 48 1,756 25 1,938 95 Non-owner occupied 648 5 1,777 — 3,039 — Consumer and other 1 — 1 — — — Total $ 1,992 $ 64 $ 6,432 $ 43 $ 9,576 $ 319 With no related allowance recorded Commercial and industrial $ 1,074 $ 38 $ 494 $ 20 $ 660 $ — Construction 1,988 46 2,622 132 4,337 127 Residential real estate: 1-to-4 family mortgage 1,718 63 1,329 137 2,815 7 Residential line of credit 156 — 156 10 — — Multi-family mortgage 1,003 46 1,051 37 652 25 Commercial real estate: Owner occupied 1,897 122 1,120 119 788 — Non-owner occupied 1,313 19 1,050 — 855 — Consumer and other 26 1 13 — — — Total $ 9,173 $ 335 $ 7,835 $ 455 $ 10,107 $ 159 Total impaired loans $ 11,164 $ 399 $ 14,267 $ 498 $ 19,683 $ 478 As of December 31, 2017 and 2016, the Company has a recorded investment in troubled debt restructurings of $8,604 and $8,802, 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 $172 and $402 of specific reserves for those loans at December 31, 2017 and 2016, respectively, and has committed to lend additional amounts totaling up to $2 and $1, respectively to these customers. Of these loans, $3,205 and $4,265 were classified as non-accrual loans as of December 31, 2017 and 2016. The following table presents the financial effect of TDRs recorded during the periods indicated: 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-to-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 $ — Year ended December 31, 2015 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial and industrial 6 $ 2,301 $ 2,301 $ 86 Commercial real estate: Owner occupied 4 786 786 — Non-owner occupied 1 133 133 1 Residential real estate: 1-4 family mortgage 5 326 326 45 Total 16 $ 3,546 $ 3,546 $ 132 There were no loans modified as troubled debt restructurings for which there was a payment default within twelve months following the modification during the year ended December 31, 2017 or 2016. The following presents loans modified as troubled debt restructurings for which there was a payment default within twelve months following the modification during the year ended December 31, 2015: Defaulted Charge-offs and specific reserves Residential real estate: 1-to-4 family mortgage $ 145 $ 45 Total $ 145 $ 45 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, 2017, 2016 and 2015 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, 2017
Property Plant And Equipment [Abstract]
Premises and Equipment	Note (6)—Premises and equipment: Premises and equipment and related accumulated depreciation as of December 31, 2017 and 2016, are as follows: 2017 2016 Land $ 22,108 $ 18,698 Premises 57,719 44,301 Furniture and fixtures 22,292 21,700 Leasehold improvements 10,740 10,515 Equipment 12,525 11,583 Construction in process 1,496 867 126,880 107,664 Less: accumulated depreciation (45,303 ) (41,013 ) Total Premises and Equipment $ 81,577 $ 66,651 Depreciation expense was $4,316, $3,995 and $3,283 for the years ended December 31, 2017, 2016 and 2015, respectively.

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2017
Real Estate [Abstract]
Other Real Estate Owned	Note (7)—Other real estate owned: Other real estate owned (“OREO”) includes property acquired through foreclosure proceedings in addition to excess land and facilities held for sale. OREO 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, 2017, 2016 and 2015: Year Ended December 31, 2017 2016 2015 Balance at beginning of period $ 7,403 $ 11,641 $ 7,259 Transfers from loans 3,605 2,724 4,085 Transfers from premises and equipment 3,466 — Capital improvements — — 171 Acquired through merger or acquisition 6,888 — 5,002 Properties sold (5,438 ) (6,696 ) (3,774 ) Gain on sale of other real estate owned 1,080 1,670 187 Transferred to loans (256 ) (1,548 ) (785 ) Write-downs and partial liquidations (306 ) (388 ) (504 ) Balance at end of period $ 16,442 $ 7,403 $ 11,641 Foreclosed residential real estate properties included in the table above totaled $3,631 and $2,143 as of December 31, 2017 and 2016, respectively. The recorded investment in residential mortgage loans secured by residential real estate properties for which foreclosure proceedings are in process totaled $19 and $96 at December 31, 2017 and 2016, respectively. During the year ended December 31, 2017, the Company acquired $6,888 in other real estate owned through the merger with the 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.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and intangible assets	Note (8)—Goodwill and intangible assets: The following table summarizes changes in goodwill during the year ended December 31, 2017. There was no such activity during the year ended December 31, 2016. Goodwill Balance at December 31, 2016 $ 46,867 Addition from merger with Clayton Banks (see Note 2) 90,323 Balance at December 31, 2017 $ 137,190 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, 2017 or the year ended December 31, 2016. 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 servicing intangible of $1,088 as a result of the Clayton Banks acquisition. The following intangibles 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, 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 December 31, 2016 Core deposit intangible $ 29,855 $ (25,292 ) $ 4,563 December 31, 2015 Core deposit intangible $ 29,855 $ (23,160 ) $ 6,695 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, 2018 $ 3,275 December 31, 2019 2,866 December 31, 2020 2,476 December 31, 2021 2,090 December 31, 2022 1,609 Thereafter 2,586 $ 14,902

Mortgage Servicing Rights

Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2017
Transfers And Servicing Of Financial Assets [Abstract]
Mortgage servicing rights	Note (9)—Mortgage servicing rights: Changes in the Company’s mortgage servicing rights were as follows for years ended December 31, 2017, 2016 and 2015: Year Ended December 31, 2017 2016 2015 Carrying value prior to policy change $ 32,070 $ 29,711 $ 6,032 Fair value impact of change in accounting policy (See Note 1) 1,011 — — Carrying value at beginning of period 33,081 29,711 6,032 Capitalization 58,984 46,070 26,474 Amortization — (8,321 ) (2,601 ) Sales (11,686 ) (34,118 ) — (Loss) gain on sale (249 ) 3,406 — Impairment — (4,678 ) (194 ) Change in fair value: Due to pay-offs/pay-downs (3,104 ) — — Due to change in valuation inputs or assumptions (919 ) — — Carrying value at December 31 $ 76,107 $ 32,070 $ 29,711 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, 2017, 2016 and 2015, respectively: Year Ended December 31, 2017 2016 2015 Servicing income: Servicing income $ 13,168 $ 12,063 $ 3,614 Change in fair value of mortgage servicing rights (4,023 ) — Change in fair value of derivative hedging instruments 599 — — Total servicing income 9,744 12,063 3,614 Servicing expenses: Servicing asset amortization — 8,321 2,601 Servicing asset impairment — 4,678 194 Loss on sale of mortgage servicing rights and related hedges and transaction costs on sale 249 4,447 — Other servicing expenses 4,896 2,325 633 Total servicing expenses 5,145 19,771 3,428 Net servicing income (loss) $ 4,599 $ (7,708 ) $ 186 Data and key economic assumptions related to the Company’s mortgage servicing rights as of December 31, 2017 and 2016 are as follows: As of December 31, 2017 2016 Unpaid principal balance $ 6,529,431 $ 2,833,958 Weighted-average prepayment speed (CPR) 8.90 % 8.40 % Estimated impact on fair value of a 10% increase (3,026 ) (1,256 ) Estimated impact on fair value of a 20% increase (5,855 ) (2,434 ) Discount rate 9.75 % 9.54 % Estimated impact on fair value of a 100 bp increase (3,052 ) (1,394 ) Estimated impact on fair value of a 200 bp increase (5,867 ) (2,679 ) Weighted-average coupon interest rate 3.94 % 3.59 % Weighted-average servicing fee (basis points) 28 27 Weighted-average remaining maturity (in months) 335 328 From time to time, the Company enters agreements to sell certain tranches of mortgage servicing rights. Upon consummation of the sale, the Company continues to subservice the underlying mortgage loans until they can be transferred to the purchaser. During the years ended December 31, 2017 and 2016, the Company sold $11,686 and $34,118 of mortgage servicing rights on $1,086,465 and $3,370,395 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, 2017, the MSR asset was fully hedged with respect to changes in the underlying interest rates (see Note 18).

Other Assets and Other liabilit

Other Assets and Other liabilities	12 Months Ended
	Dec. 31, 2017
Other Assets And Other Liabilities [Abstract]
Other assets and other liabilities	Note (10)—Other assets and other liabilities: Included in other assets are: As of December 31, Other assets 2017 2016 Cash surrender value on bank owned life insurance $ 10,873 $ 10,556 Prepaid expenses 2,477 2,245 Software 1,962 2,296 Mortgage lending receivable 3,176 24 Derivatives 9,690 19,745 Other assets 16,038 16,488 Total other assets $ 44,216 $ 51,354 Included in other liabilities are: As of December 31, Other liabilities 2017 2016 Deferred compensation $ 5,301 $ 6,710 Accrued payroll 11,018 5,987 Mortgage servicing escrows 3,341 1,079 Mortgage buyback reserve 3,386 2,659 Accrued interest 1,504 632 Derivatives 1,699 586 Deferred tax liability (See Note 15) 11,858 4,180 Right to repurchase GNMA loans serviced (See Note 1) 43,035 — Other liabilities 37,852 36,535 Total other liabilities $ 118,994 $ 58,368

Deposits

Deposits	12 Months Ended
	Dec. 31, 2017
Time Deposits [Abstract]
Deposits	Note (11)—Deposits: The aggregate amount of time deposits with a minimum denomination greater than $250 was $176,837 and $60,124 at December 31, 2017 and 2016, respectively. At December 31, 2017, the scheduled maturities of time deposits are as follows: Scheduled maturities of time deposits Due on or before: December 31, 2018 $ 432,030 December 31, 2019 139,398 December 31, 2020 56,719 December 31, 2021 32,893 December 31, 2022 24,075 Thereafter 3,214 Total $ 688,329

Securities Sold Under Agreement

Securities Sold Under Agreements to Repurchase	12 Months Ended
	Dec. 31, 2017
Securities Sold Under Agreements To Repurchase [Abstract]
Securities sold under agreements to repurchase	Note (12)—Securities sold under agreements to repurchase: Securities sold under agreements to repurchase are secured by mortgage-backed securities with a carrying amount of $14,293 and $21,561 at December 31, 2017 and 2016, respectively. Securities sold under agreements to repurchase are financing arrangements that mature daily. Information concerning securities sold under agreements to repurchase is summarized as follows: 2017 2016 Balance at year end $ 14,293 $ 21,561 Average daily balance during the year 16,326 60,331 Average interest rate during the year 0.17 % 0.11 % Maximum month-end balance during the year 19,432 115,005 Weighted average interest rate at year-end 0.16 % 0.17 %

Short-term Borrowings

Short-term Borrowings	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Short-term borrowings	Note (13)—Short-term borrowings: The Bank currently has available from correspondent banks borrowings capacity in the form of federal fund purchases. The line with First Tennessee Bank, N.A. is for $30,000 as of December 31, 2017 and 2016 and the line with BBVA Compass Bank is for $10,000 as of December 31, 2017 and 2016. Each of these lines may be drawn for fourteen consecutive days. As of December 31, 2017 and 2016 there were no borrowings against these lines. The line with SunTrust Bank is for $15,000 and may be drawn for seven consecutive days before collateral is required. Borrowings that exceed seven days must be secured by a marketable security with a current value of at least 125% of the outstanding balance. As of December 31, 2017 and 2016, there were no borrowings against this line. The line with First National Banker’s Bank is for $10,000 and may be drawn for thirty days before collateral is required. The line with Zions Bank is for $25,000. The line with PNC Bank is for $20,000. The line with ServisFirst Bank is for $15,000. As of December 31, 2017 and 2016, there were no borrowings against these lines. The line with Federal Home Loan Bank is for $300,000 as of December 31, 2017 and 2016, respectively, and is secured by qualifying mortgage loans and investment securities. At December 31, 2017 and 2016, the Company had pledged investments securities of $0 and $60,371 and loans of $968,567 and $565,718, securing borrowings against this line of $190,000 and $150,000 as of December 31, 2017 and 2016, respectively. The Company maintained a line with the Federal Reserve Bank through the Borrower-in-Custody program in 2017 and 2016. As of December 31, 2017 and 2016, $737,856 and $1,072,118 of qualifying loans and $13,544 and $0 of investment securities were pledged to the Federal Reserve Bank through the Borrower-in-Custody program securing a line of credit of $529,547 and $765,107.

Long-term Debt

Long-term Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Long-term Debt	Note (14)—Long-term debt: As of December 31, 2015 the Company had three subordinated notes payable with the shareholder of the Company for $775, $3,300 and $6,000. On September 21, 2016 these notes were paid off in full with proceeds from the initial public offering. The Bank had a total borrowing capacity of $671,461 and $476,562 at the Federal Home Loan Bank of Cincinnati at December 31, 2017 and 2016, respectively. The terms of the borrowings were subject to market rates at the time of the advances and contain maturities of one to twelve years. Advances from this line are secured by qualifying loans of $968,567 and $565,718 and investment securities of $0 and $60,371 at December 31, 2017 and 2016, respectively. The Bank had $112,372 of fixed rate borrowings with the FHLB at a weighted average rate of 1.45% outstanding at December 31, 2017. At December 31, 2016 the Bank had $13,962 of fixed rate borrowings at a weighted average rate of 3.02% outstanding. This includes $100,000 borrowed in the third quarter of 2017 as part of the funding strategy of the merger with the Clayton Banks. The advances mature and reprice every 90 days. The Company also entered into three corresponding interest rate swaps to hedge. 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, 2017, were 4.59% and 4.82%, respectively. Rates for the two issues at December 31, 2016, were 4.25% and 4.15%, 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. During the year ended December 31, 2017, the Company began hedging interest rate exposure related to the subordinated debentures through interest rate swaps designated as cash flow hedges (see Note 18). Maturities of long-term debt as of December 31, 2017 are as follows: FHLB Junior Subordinated debt Total Due on or before: December 31, 2018 $ 109,712 (1) $ — $ 109,712 (1) December 31, 2019 224 — 224 December 31, 2020 131 — 131 December 31, 2021 418 — 418 December 31, 2022 890 — 890 Due thereafter 997 30,930 31,927 Total $ 112,372 $ 30,930 $ 143,302 (1) Includes $100,000 of advances with 90 day fixed rate repricing terms that are being hedged with interest rate swaps maturing in 2020, 2021, and 2022 in increments of $30,000, $35,000 and $35,000, respectively. As such, these advances are classified as long-term debt on the consolidated balance sheets.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Note (15)—Income taxes: 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. As such, any periods prior to September 16, 2016 will only reflect an effective state income tax rate. 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 to date and for prior year periods. Allocation of federal and state income taxes between current and deferred portions is as follows: December 31, 2017 2016 2015 Current $ 14,629 $ 12,476 $ 1,321 Deferred 6,458 9,257 1,647 Total $ 21,087 $ 21,733 $ 2,968 The reconciliation of income taxes computed at the United States federal statutory tax rates to the provision for income taxes is as follows, for the periods presented: December 31, 2017 2016 2015 Federal taxes calculated at statutory rate $ 25,720 $ 5,061 $ — Increase (decrease) resulting from: State taxes, net of federal benefit 3,053 3,664 2,956 Revaluation of net deferred tax liability as a result of the Tax Cuts and Jobs Act (5,894 ) — — Conversion as of September 16, 2016 to C Corporation — 13,181 — Benefit of equity based compensation (310 ) (786 ) — Permanent items (1,402 ) (633 ) 12 Other (80 ) 1,246 — Income tax expense, as reported $ 21,087 $ 21,733 $ 2,968 The components of the net deferred tax liability at December 31, 2017 and 2016, are as follows: For the year ended December 31, 2017 2016 Deferred tax assets: Allowance for loan losses $ 6,264 $ 8,516 Amortization of core deposit intangible 759 996 Compensation related 6,158 7,552 Unrealized loss on securities 988 2,462 Other 3,599 2,430 Subtotal 17,768 21,956 Deferred tax liabilities: FHLB stock dividends (550 ) (827 ) Depreciation (4,115 ) (6,548 ) Mortgage servicing rights (19,830 ) (12,558 ) Other (5,131 ) (6,203 ) Subtotal (29,626 ) (26,136 ) Net deferred tax liability $ (11,858 ) $ (4,180 ) 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 was $5,894, which was included in “income taxes” in the Consolidated Statements of Income. Although in the normal course of business the Company is required to make estimates and assumptions for certain tax items which cannot be fully determined at period end, the Company did not identify items for which the income tax effects of the Tax Act have not been completed as of December 31, 2017 and, therefore, considers its accounting for the tax effects of the Tax Act on its deferred tax assets and liabilities to be complete as of December 31, 2017. 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 2013 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, 2017
Disclosure Of Restrictions On Dividends Loans And Advances Disclosure [Abstract]
Dividend Restrictions	Note (16)—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, $105,453 and $66,180 was available for payment of dividends without such prior approval at December 31, 2017 and 2016, 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. For the years ended December 31, 2017, 2016 and 2015 the Bank declared dividends to the Company in the amounts of $0, $69,300 and $23,600, respectively, which was then paid to the Company’s shareholder.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note (17)—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. Year Ended December 31, 2017 2016 Commitments to extend credit, excluding interest rate lock commitments $ 977,276 $ 579,879 Letters of credit 22,882 22,547 Balance at end of period $ 1,000,158 $ 602,426 Commitments under non-cancelable operating leases were as follows, before considering renewal options that generally are present: 2018 $ 3,533 2019 2,806 2020 2,318 2021 2,074 2022 1,623 Thereafter 5,350 Total $ 17,704 Rent expense for the years ended December 31, 2017, 2016 and 2015, was $4,245, $3,904 and $3,750, 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 $4,704 and $8,326 and $2,453 for the years ended December 31, 2017, 2016 and 2015, respectively. The Bank has established a reserve associated with loan repurchases. This reserve is recorded in accrued expenses and other liabilities on the consolidated balance sheet. The following table summarizes the activity in the repurchase reserve: For the year ended December 31, 2017 2016 2015 Balance at beginning of period $ 2,659 $ 2,156 $ 828 Provision for loan repurchases or indemnifications 810 512 1,375 Recoveries on previous losses — 9 — Losses on loans repurchased or indemnified (83 ) (18 ) (47 ) Balance at end of period $ 3,386 $ 2,659 $ 2,156

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives	Note (18)—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 a mortgage loan 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 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 of the change in the fair value of its 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. 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 14 “Long term debt” 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, 2017, the fair value of these contracts was $305. 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 short-term FHLB borrowings obtained to fund the Clayton Banks merger. 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 included in those designated as hedging below. 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. The following table provides details on the Company’s derivative financial instruments as of the dates presented: 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 — Option contracts 6,000 29 — Total $ 1,810,484 $ 8,258 $ 1,699 December 31, 2016 Notional Amount Asset Liability Not designated as hedging: Interest rate contracts $ 22,243 $ 586 $ 586 Forward commitments 829,000 12,731 — Interest rate-lock commitments 532,920 6,428 — Futures contracts — — — Total $ 1,384,163 $ 19,745 $ 586 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, 2017 2016 2015 Not designated as hedging instruments (included in mortgage banking income): Interest rate lock commitments $ 340 $ 835 $ 2,073 Forward commitments (11,987 ) 10,497 (3,600 ) Futures contracts 315 — — Option contracts 22 — — Total $ (11,310 ) $ 11,332 $ (1,527 ) Year Ended December 31, 2017 2016 2015 Designated as hedging: Amount of gain reclassified from other comprehensive income and recognized in interest expense on long-term debt $ 168 $ — $ — Included in loss on sale of mortgage servicing rights — (5,569 ) — Total $ 168 $ (5,569 ) $ — The following discloses the amount included in other comprehensive income, net of tax, for derivative instruments designated as cash flow hedges for the periods presented: Year Ended December 31, 2017 2016 2015 Designated as hedging: Amount of gain recognized in other comprehensive income, net of tax $ 685 $ — $ —

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair value of financial instruments	Note (19)—Fair value of financial instruments: ASC 820-10 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: Available-for-sale securities—Available-for-sale 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. Available-for-sale 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. If fair value is used, it 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 is comprised of commercial and residential real estate obtained in partial or total satisfaction of loan obligations. 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. Mortgage servicing rights are disclosed as 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 methods were used to estimate the fair value of the Company’s financial instruments which were not previously presented. Cash and cash equivalents—Cash and cash equivalents consist of cash and due from banks with other financial institutions and federal funds sold. The carrying amount reported in the consolidated balance sheets approximates the fair value based upon the short-term nature of these assets. Also included are interest-bearing deposits in financial institutions. Interest bearing deposits in financial institutions consist of interest bearing accounts at the Federal Reserve Bank and Federal Home Loan Bank. The carrying value reported in the consolidated balance sheets approximates the fair value based upon the short-term nature of the assets. Federal Home Loan Bank stock—The carrying value of Federal Home Loan Bank stock reported in the consolidated balance sheets approximates the fair value as the stock is redeemable at the carrying value. Loans—For variable rate loans that re-price frequently and with no significant change in credit risk, fair values are based upon carrying values. Fixed rate loan fair values are estimated using a discounted cash flow analysis based upon interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. Deposits—The fair value disclosed for demand deposits (both interest bearing and noninterest bearing) and savings deposits are equal to the amount payable on demand as of the reporting date. The fair value of the time deposits is estimated using a discounted cash flow method based upon current rates for similar types of accounts. Short term borrowings—The fair value of the lines of credit which represent federal funds purchased approximate the carrying value of the amounts reported on the balance sheet due to the short-term nature of these liabilities. Securities sold under agreement to repurchase—The fair value of the securities sold under agreement to repurchase approximate the carrying value of the amounts reported on the balance sheet due to the short-term nature of these liabilities. Long-term debt—The fair value of long-term debt is determined using discounted cash flows using current rates. Accrued interest payable and receivable – The carrying amounts of accrued interest approximate fair value. The estimated fair values of the Company’s financial instruments are as follows: 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 Available-for-sale securities 543,992 — 540,388 3,604 543,992 Federal Home Loan Bank Stock 11,412 — — 11,412 11,412 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 repurchase 14,293 14,293 — — 14,293 Short term borrowings 190,000 190,000 — — 190,000 Interest payable 1,504 575 929 — 1,504 Long-term debt 143,302 — 149,135 — 149,135 Derivatives 1,699 — 1,699 — 1,699 Fair Value December 31, 2016 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 136,327 $ 136,327 $ — $ — $ 136,327 Available-for-sale securities 582,183 — 577,634 4,549 582,183 Federal Home Loan Bank Stock 7,743 — — 7,743 7,743 Loans, net 1,827,037 — 1,822,054 1,281 1,823,335 Loans held for sale 507,442 — 507,442 — 507,442 Interest receivable 7,241 — 7,241 — 7,241 Mortgage servicing rights, net 32,070 — — 33,081 33,081 Derivatives 19,745 — 19,745 — 19,745 Financial liabilities: Deposits: Without stated maturities $ 2,280,531 $ 2,280,531 $ — $ — $ 2,280,531 With stated maturities 391,031 — 390,484 — 390,484 Securities sold under agreement to repurchase 21,561 21,561 — — 21,561 Short term borrowings 150,000 150,000 — — 150,000 Interest payable 632 249 383 — 632 Long-term debt 44,892 — 47,377 — 47,377 Derivatives 586 — 586 — 586 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: 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 The balances and levels of the assets measured at fair value on a recurring basis at December 31, 2016 are presented in the following table: At December 31, 2016 Quoted prices in active markets for identical (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 $ — $ 985 $ — $ 985 Mortgage-backed securities — 443,908 — 443,908 Municipals, tax-exempt — 116,923 — 116,923 Treasury securities — 11,757 — 11,757 Equity securities — 4,061 4,549 8,610 Total $ — $ 577,634 $ 4,549 $ 582,183 Loans held for sale — 507,442 — 507,442 Derivatives — 19,745 — 19,745 Financial Liabilities: Derivatives $ — $ 586 $ — $ 586 The balances and levels of the assets measured at fair value on a non-recurring basis at December 31, 2016 are presented in the following table: At December 31, 2016 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 $ — $ — $ 2,315 $ 2,315 Mortgage servicing rights — — 32,070 32,070 Impaired Loans: Commercial and industrial — — 542 542 Residential real estate: 1-4 family mortgage — — 103 103 Commercial real estate: Owner occupied — — 635 635 Consumer and other — — 1 1 Total $ — $ — $ 1,281 $ 1,281 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, 2017 and 2016: Available-for-sale securities Year Ended December 31, 2017 2016 Balance at beginning of period $ 4,549 $ 4,856 Realized gains included in net income — — Unrealized gains included in other comprehensive income — — Impairment of equity securities (945 ) — Purchases — — Capital distribution — (307 ) Balance at end of period $ 3,604 $ 4,549 The fair value of certain of the Company’s equity securities are determined from information derived from external parties that calculate discounted cash flows using swap and LIBOR curves plus spreads that adjust for loss severities, volatility, credit risk and optionality. When available, broker quotes are used to validate the model. Industry research reports as well as assumptions about specific-issuer defaults and deferrals are reviewed and incorporated into the calculations. There is no established market for the Company’s equity securities, and as such, the Company has estimated that historical costs approximates market value. 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 Valuation technique Significant Unobservable inputs Range of inputs Impaired loans $ 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% The following table presents information as of December 31, 2016 about significant unobservable inputs (Level 3) used in the valuation of assets measured at fair value on a nonrecurring basis: Financial instrument Fair Valuation technique Significant Unobservable inputs Range of inputs Impaired loans $ 1,281 Valuation of collateral Discount for comparable sales 0%-30% Other real estate owned $ 2,315 Appraised value of property less costs to sell Discount for costs to sell 0%-10% Mortgage servicing rights, net $ 33,081 Discounted cash flows See Note 9 See Note 9 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 $9,111 and $(2,289) resulting from fair value changes of the mortgage loans were recorded in income during the year ended December 31, 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 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 which do not meet the requirements under FASB ASC Topic 825 to be accounted for under the fair value option. GNMA optional repurchase loans totaled $43,035 at December 31, 2017 and are included in loans held for sale on the accompanying Consolidated Balance Sheets. Amounts related to previous periods were not deemed significant. 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, 2017 and 2016: December 31, 2017 Aggregate fair value Aggregate Unpaid Principal Balance Difference 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 — December 31, 2016 Mortgage loans held for sale measured at fair value $ 507,442 $ 501,503 $ 5,939 Past due loans of 90 days or more — — — Nonaccrual loans — — —

Parent Company Only Financial S

Parent Company Only Financial Statements	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Parent Company Only Financial Statements	Note (20)—Parent company only financial statements: As of December 31, Balance sheet 2017 2016 Assets Cash and cash equivalents (1) $ 25,789 $ 30,993 Investments 1,129 2,074 Investments in Bank subsidiary (1) 595,625 325,574 Other assets 5,411 2,972 Goodwill 29 29 Total assets $ 627,983 $ 361,642 Liabilities and shareholders' equity Liabilities Long-term debt $ 30,930 $ 30,930 Accrued expenses and other liabilities 324 214 Total liabilities $ 31,254 $ 31,144 Shareholders' equity Common stock $ 30,536 $ 24,108 Additional paid-in capital 418,596 213,480 Retained earnings 147,449 93,784 Accumulated other comprehensive (loss) income 148 (874 ) Total shareholders' equity $ 596,729 $ 330,498 Total liabilities and shareholders' equity $ 627,983 $ 361,642 (1) Eliminates in Consolidation For the years ended December 31, Income Statements 2017 2016 2015 Income Other interest income $ 41 $ 33 $ 33 Interest income from Bank subsidiary (1) — 95 121 Gain (loss) on investments (945 ) 417 — Dividend income from Bank subsidiary (1) — 14,875 25,105 Earnings from Bank subsidiary (1) 54,713 26,859 23,879 Total income $ 53,809 $ 42,279 $ 49,138 Expenses Interest expense $ 1,491 $ 1,393 $ 1,298 Salaries, legal and professional fees 893 315 3 Other noninterest expense 296 168 59 Federal and state income tax benefit (1,269 ) (188 ) (78 ) Total expenses $ 1,411 $ 1,688 $ 1,282 Net income $ 52,398 $ 40,591 $ 47,856 (1) Eliminates in Consolidation For the years ended December 31, Statement of Cash Flows 2017 2016 2015 Operating Activities Net income $ 52,398 $ 40,591 $ 47,856 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed income of subsidiary bank (54,713 ) (26,859 ) (23,879 ) Loss (gain) on investments 945 (417 ) — Stock-based compensation expense — 4,693 — (Increase) decrease in other assets (2,439 ) (427 ) 1,292 Increase (decrease) in other liabilities (551 ) (5,251 ) 23 Other, net - 7 (1 ) Net cash provided by operating activities $ (4,360 ) $ 12,337 $ 25,291 Investing Activities Other investments $ — $ 724 $ 761 Net cash provided by investing activities $ — $ 724 $ 761 Financing Activities Equity contribution to Bank $ (154,200 ) $ (20,000 ) $ — Payment of dividends — (69,300 ) (25,350 ) Payment of subordinated debt — (10,075 ) — Net proceeds from sale of common stock 153,356 116,054 — Net cash (used in) provided by financing activities $ (844 ) $ 16,679 $ (25,350 ) Net (decrease) increase in cash and cash equivalents (5,204 ) 29,740 702 Cash and Cash Equivalents at beginning of year 30,993 1,253 551 Cash and Cash Equivalents at end of year $ 25,789 $ 30,993 $ 1,253 Supplemental noncash disclosures: 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, 2017
Segment Reporting [Abstract]
Segment Reporting	Note (21)—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 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. As such, the tables below have been revised to reflect the reclassification for all periods presented. The following tables provides segment financial information for the years ended December 31, 2017, 2016 and 2015 follows: 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 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 related to the merger with the Clayton Banks. 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 related to the acquisition of NWGB. Year Ended December 31, 2015 Banking Mortgage Consolidated Net interest income $ 92,366 $ 1,506 $ 93,872 Provision for loan loss (3,070 ) 6 (3,064 ) Mortgage banking income 18,718 51,472 70,190 Other noninterest income 22,190 — 22,190 Depreciation and amortization 2,933 350 3,283 Amortization of intangibles 1,731 — 1,731 Amortization and impairment of mortgage servicing rights — 2,795 2,795 Other noninterest mortgage banking expense 13,189 42,949 56,138 Other noninterest expense (1) 74,545 — 74,545 Income before income taxes 43,946 6,878 50,824 Income tax expense 2,968 Net income 47,856 Total assets $ 2,570,071 $ 329,349 $ 2,899,420 Goodwill 46,804 100 46,904 (1) Included $3,543 in merger and conversion expenses related to the acquisition of NWGB. 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 had a prime interest rate of 4.50%, 3.75% and 3.50% as of December 31, 2017, 2016 and 2015, respectively. 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 $16,932, $12,636 and $8,688 for the

Minimum Capital Requirements

Minimum Capital Requirements	12 Months Ended
	Dec. 31, 2017
Banking And Thrift [Abstract]
Minimum capital requirements	Note (22)—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. For December 31, 2017 and 2016 Interim Final Basel III rules require the Bank 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, 2017 and 2016, the Bank and Company met all capital adequacy requirements to which it is subject. Also, as of December 31, 2017, the most recent notification from the FDIC, the Bank was well capitalized under the regulatory framework for prompt corrective action. There are no conditions or events since that notification that management believes have changed the Bank’s category. The table below includes new regulatory capital ratio requirements that became effective on January 1, 2015. 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. The capital conservative buffer will be fully phased in January 1, 2019 at 2.5 percent. Actual and required capital amounts and ratios are presented below at period-end. Actual For Minimum Capital adequacy with capital buffer To be well capitalized under action provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio December 31, 2017 Total Capital (to risk-weighted assets) FB Financial Corporation $ 496,422 12.01 % $ 330,672 8.0 % $ 382,340 9.25 % N/A N/A FirstBank 466,102 11.30 % 329,984 8.0 % 381,544 9.25 % $ 412,480 10.0 % Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 472,381 11.43 % $ 247,969 6.0 % $ 299,629 7.25 % N/A N/A FirstBank 442,061 10.72 % 247,422 6.0 % 298,968 7.25 % $ 247,422 6.0 % Tier 1 Capital (to average assets) FB Financial Corporation $ 472,381 10.46 % $ 180,643 4.0 % N/A N/A N/A N/A FirstBank 442,061 9.77 % 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 10.71 % $ 185,874 4.5 % $ 237,506 5.75 % N/A N/A FirstBank 442,061 10.72 % 185,567 4.5 % 237,113 5.75 % $ 268,041 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, 2016 Total Capital (to risk-weighted assets) FB Financial Corporation $ 338,893 13.03 % $ 208,069 8.0 % $ 224,325 8.63 % N/A N/A FirstBank 304,018 11.72 % 207,521 8.0 % 223,733 8.63 % $ 259,401 10.0 % Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 317,146 12.19 % $ 156,101 6.0 % $ 172,362 6.63 % N/A N/A FirstBank 282,271 10.88 % 155,664 6.0 % 171,879 6.63 % $ 155,664 6.0 % Tier 1 Capital (to average assets) FB Financial Corporation $ 317,146 10.05 % $ 126,227 4.0 % N/A N/A N/A N/A FirstBank 282,271 8.95 % 126,155 4.0 % N/A N/A $ 157,693 5.0 % Common Equity Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 287,146 11.04 % $ 117,043 4.5 % $ 133,299 5.13 % N/A N/A FirstBank 282,271 10.88 % 116,748 4.5 % 132,963 5.13 % $ 168,636 6.5 %

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plans	Note (23)—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, 2017, 2016 and 2015, the matching portions provided by the Bank to this Plan were $2,344 and $1,379 and $1,290 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, 2017 and 2016, other liabilities on the consolidated balance sheet include post-retirement benefits payable of $1,510 and $2,023, respectively, related to these plans. For the years ended December 31, 2017, 2016 and 2015, the Company recorded expense of $4, $30 and $313, respectively, related to these plans and payments to the participants were $191, $205 and $202 in 2017, 2016 and 2015, respectively. The Company also acquired single premium life insurance policies on these individuals. At December 31, 2017 and 2016, other assets on the consolidated balance sheet include $10,873 and $10,556 and reported cash value income (net of related insurance premium expense) of $164, $181 and $136 in 2017, 2016 and 2015, respectively. (C)—Deferred compensation plans and agreements: The Bank has 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 entered into 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, 2017 and 2016, other liabilities in the accompanying consolidated balance sheet include liabilities for the awards under the EBI Plans and Mr. Holmes’ agreement totaling $2,346 and $3,758, respectively. Effective September 16, 2016, $5,388 of accrued compensation was reclassified to additional paid in capital related to these awards. As of December 31, 2017 and 2016, 67,470 and 180,447 units, respectively, remain in the equity based incentive plan for those employees who elected cash settlement of EBI units. For the year ended December 31, 2017 and 2016, the Company incurred expenses related to these plans and agreements totaling $3,685 and $5,073, respectively, which is included in salaries, commissions and employee benefits in the accompanying statement of income. Additionally, payments under the plans totaled $5,163 and $1,601, respectively, for 2017 and 2016.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	Note (24)—Stock-Based Compensation The Company granted shares of common stock and restricted stock units in connection with its initial public offering and compensation arrangements for the benefit of employees, executive officers, and directors. Additionally, 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 23) were given the option to elect conversion of their outstanding cash-settled EBI Units to stock-settled restricted stock units. The following table summarizes information about vested and unvested restricted stock units outstanding at December 31, 2016: For the year ended December 31, 2017 2016 Restricted Stock Units Outstanding Weighted Average Grant Date Fair Value Restricted Stock Units Outstanding Weighted Average Grant Date Fair Value Balance at beginning of period 1,200,840 $ 19.00 — Conversion of deferred compensation plan — 19.00 157,895 19.00 Conversion of equity based incentive (EBI) plans — 19.00 125,684 19.00 Grants 123,169 35.15 1,077,066 19.00 Released and distributed (vested) (103,639 ) 21.25 (157,748 ) 19.00 Forfeited/expired (6,045 ) 19.00 (2,057 ) 19.00 Balance at end of period 1,214,325 $ 19.97 1,200,840 19.00 The total fair value of restricted stock units vested and released was $2,202 and $2,997 for the years ended December 31, 2017 and 2016, respectively. The compensation cost related to stock grants and vesting of restricted stock units was $8,184 As of December 31, 2017 and 2016, there were $12,950 and $15,721, respectively, of total unrecognized compensation cost related to nonvested stock-settled EBI Units and restricted stock units which is expected to be recognized over a weighted-average period of 2.80 years and 3.66 years, respectively. At December 31, 2017 and 2016, there were 67,470 and 180,477 units valued at $2,833 and $4,683, respectively, remaining in the equity based incentive plans for employees who elected cash settlement of EBI units. Expense related to the cash settled EBI for the years ended December 31, 2017 and 2016 was $1,213 and $337, respectively. 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 was the IPO price of $19.00 per share, with respect to the first offering period ended in 2016, and is 95% with respect to subsequent offering periods, of the lower of the 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, 2017 and 2016, there were 18,658 shares and 20,377 shares of common stock issued under the ESPP, respectively. As of December 31, 2017 and 2016, there were 2,460,965 and 2,479,623 shares available for issuance under the ESPP.

Related party transactions

Related party transactions	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Related party transactions	Note (25)—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. In management’s opinion, these transactions with directors and executive officers were made on substantially the same terms as those prevailing at the time for comparable transactions with other unaffiliated persons and did not involve more than the normal risk. An analysis of loans to executive officers, certain management, and directors of the Bank and their affiliates follows: Loans outstanding at January 1, 2017 $ 27,370 New loans and advances 1,204 Change in related party status (624 ) Repayments (6,938 ) Loans outstanding at December 31, 2017 $ 21,012 Unfunded commitments to certain executive officers, certain management and directors and their associates totaled $4,672 and $6,838 at December 31, 2017 and 2016, respectively. (B) Deposits: The Bank held deposits from related parties totaling $110,465 and $150,373 as of December 31, 2017 and 2016, respectively. (C) Leases: The Bank leases various office spaces from entities owned by certain directors of the Company under varying terms. The Company had $137 and $158 in unamortized leasehold improvements related to these leases at December 31, 2017 and 2016, respectively. These improvements are being amortized over a term not to exceed the length of the lease. Lease expense for these properties totaled $504, $522 and $503 for the years ended December 31, 2017, 2016 and 2015, respectively. (D) Consulting services: The Bank paid $306 for the year ended December 31, 2015 in management consulting services to an entity owned 100% by the then-sole shareholder. The agreement was terminated effective January 1, 2016. (E) Subordinated debt: On February 12, 1996, the Company borrowed $775 from the then-sole shareholder through a term subordinated note. On August 26, 1999, the Company borrowed $3,300 from the shareholder through a term subordinated note. On June 30, 2006, the Company borrowed $6,000 from the shareholder through a term subordinated note. The total of $10,075 was repaid with cash proceeds from the sale of common stock in the initial public offering, as discussed in Note 1. The Company paid interest payments related to these subordinated debentures to the shareholder amounting to approximately $230 and $237 for the years ended December 31 2016 and 2015, respectively. (F) 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 $200 and $1,145 as of December 31, 2017 and 2016, respectively.. (G) 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, 2017 and 2016, the Company made payments of $176 and $313, respectively, under these agreements.

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent events	Note (26)—Subsequent event: The Company has evaluated subsequent events through March 16, 2018, the date these financial statements were available to be issued. There were no subsequent events that occurred after December 31, 2017, 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, 2017
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. In connection with the determination of the estimated fair value of other real estate owned and impaired loans, management obtains independent appraisals for significant properties. The consolidated financial statements include the accounts of the Company, the Bank, and its’ wholly-owned subsidiaries, FirstBank Insurance, Inc., First Holdings, Inc., RE Holdings, 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, repurchase agreements, federal funds sold, and short-term 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. Equity securities with readily determinable fair values are classified as available-for-sale. Securities available-for-sale are carried at fair value, with unrealized holding gains and losses reported in other comprehensive income, net of applicable taxes. 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 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 year ended December 31, 2017, the Company recorded OTTI amounting to $945 as discussed in Note 4.
Loans held for sale	(F) 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 $9,111, $(2,289), and $2,257 resulting from fair value changes of these mortgage loans were recorded in income during 2017, 2016, and 2015, 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 2017, 2016 and 2015, the Bank transferred approximately $11,706, $18,000, and $5,000, respectively, of residential mortgage loans into its portfolio. The loans are transferred into the portfolio at fair value at the date of transfer. 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 and the expected benefit of the potential buy-back is more than trivial, 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. These loans are reported as loans held for sale with the offsetting liability being reported in other liabilities. At December 31, 2017, rebooked GNMA loans held for sale amounted to $43,035. Amounts related to prior periods were not significant. 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)	(G) 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. Interest on loans is recognized as income by using the simple interest method on daily balances of the principal amount outstanding. 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	(H) 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 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	(I) Business combinations, accounting for acquired loans and related assets: 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 the 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.
Premises and equipment	(J) 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	(K) 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. After foreclosure, valuations are periodically performed by management and the asset is carried at the lower of carrying amount or fair value less costs to sell. Revenue and expenses from operations are included in other noninterest income and noninterest expenses. Losses due to the valuation of the property are included in (gain) loss on sales or write-downs of foreclosed assets.
Mortgage servicing rights	(L) 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. 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 the lower of amortized cost or fair value. 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. Mortgage servicing rights were carried at amortized cost less the reserve for impairment at December 31, 2016. 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 and $194 were recognized in earnings during the years ended December 31, 2016 and 2015, respectively. 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 January 1, 2017. Subsequent changes in fair value are recorded in earnings in Mortgage banking income.
Transfers of financial assets	(M) 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	(N) 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. As discussed in Note 21, the Company realigned its segment reporting structure during the year ended December 31, 2016. As a result, our reporting units have been adjusted to reflect this change from geographic-based reporting units to business segment reporting units. 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 as 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 quantitative annual assessment for impairment performed as of December 31, 2017. Additionally, qualitative and quantitative assessments were performed for the years ended December 31, 2016 and 2015, respectively, and no impairment was identified. 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 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.
Income taxes	(O) 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 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 and 35.08% for the year ended December 31, 2015, as if it had been a C corporation during those periods. 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 15. 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 15, “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. There were no amounts related to interest and penalties recognized for the years ended December 31, 2017, 2016 or 2015.
Long-lived assets	(P) 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. No long-lived assets were deemed to be impaired at December 31, 2017 and 2016.
Off-Balance sheet financial instruments	(Q) 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	(R) 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.” 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 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 “Other noninterest income” on the Consolidated Statements of Income.
Comprehensive income	(S) 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	(T) 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	(U) 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 reflected in the consolidated balance sheets at the amount of cash received in connection with each transaction. These are secured liabilities and are not covered by the Federal Deposit Insurance Corporation.
Advertising expense	(V) Advertising expense: Advertising costs, including costs related to internet mortgage marketing and related costs, are expensed as incurred. For the years ended December 31, 2017, 2016 and 2015, advertising costs were $12,957, $10,608 and $8,062, respectively.
Earnings per common share	(W) Earnings per common share: Basic earnings per common share are net income divided by the weighted average number of common shares outstanding during the period. Diluted earnings per common share include the dilutive effect of additional potential common shares issuable under the restricted stock units granted but not yet vested and distributable. Unearned compensation plus assumed proceeds from the applicable tax benefits are used to repurchase common stock at the average market price. There were no dilutive instruments outstanding during the year ended December 31, 2015; therefore, diluted net income per common share is the same as basic net income per share. The following is a summary of the basic and diluted earnings per common share calculation for each of the periods presented: December 31, 2017 2016 2015 Basic earnings per share calculation: Net income $ 52,398 $ 40,591 $ 47,856 Weighted-average basic shares outstanding 27,627,228 19,165,182 17,180,000 Basic earnings per share $ 1.90 $ 2.12 $ 2.79 Diluted earnings per share: Net income $ 52,398 $ 40,591 $ 47,856 Weighted-average basic shares outstanding 27,627,228 19,165,182 17,180,000 Average diluted common shares outstanding 580,374 146,992 — Weighted-average diluted shares outstanding 28,207,602 19,312,174 17,180,000 Diluted earnings per share $ 1.86 $ 2.10 $ 2.79 Pro forma earnings per share: Pro forma net income $ 52,398 $ 39,422 $ 32,995 Weighted-average basic shares outstanding 27,627,228 19,165,182 17,180,000 Pro forma basic earnings per share $ 1.90 $ 2.06 $ 1.92 Pro forma diluted earnings per share: Pro forma net income $ 52,398 $ 39,422 $ 32,995 Weighted-average diluted shares outstanding 28,207,602 19,312,174 17,180,000 Pro forma diluted earnings per share $ 1.86 $ 2.04 $ 1.92
Segment reporting	(X) 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 21.
Stock-based compensation	(Y) Stock-based compensation Stock-based compensation expense is recognized in accordance with ASC 718-20, “ Compensation – Stock Compensation Awards Classified as Equity”.
Recent Accounting Pronouncements	(Z) Recent Accounting Pronouncements In May 2014, the FASB issued an update to Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers” (FASB Topic 606). The guidance in this update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance provides steps to follow to achieve the core principle. An entity should disclose sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Qualitative and quantitative information is required about contracts with customers, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. The amendments in this update are effective for interim and annual reporting periods beginning after December 15, 2017. The Company's revenue is comprised of interest income on financial assets, which is excluded from the scope of this new guidance, and non-interest income. The Company adopted this new guidance on January 1, 2018, and it will not have a significant impact on the Company's financial condition, results of operations or EPS. In September 2015, the FASB issued ASU 2015-16, “Simplifying the Accounting for Measurement-Period Adjustments.” The update requires acquirers to adjust provisional amounts identified during the measurement period in the reporting period in which the adjustments are determined, rather than retrospectively adjusting previously reported information. Additional disclosure of the impact of measurement period adjustments on current year earnings will also be required. For public business entities, the amendments of this update were effective for interim and annual periods beginning after December 15, 2015. The Company elected to early adopt this ASU for the year ended December 31, 2015. The adoption of this ASU did not have a material impact on the Company’s financial position, results of operation, or earnings per share (“EPS”). In January 2016, the FASB released ASU 2016-01, “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. The Company adopted this new guidance on January 1, 2018, and it will not have a significant impact on the Company’s financial position, results of operation, or EPS. In February 2016, the FASB issued ASU 2016-02, “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 become effective for interim and annual periods beginning after December 15, 2018. Management is currently evaluating the potential impact of this update, but does not expect the requirements to have a significant impact on the Company’s financial position, results of operation, or EPS. In March 2016, the FASB issued ASU 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” Under ASU 2016-09 all excess tax benefits and tax deficiencies related to share-based payment awards should be recognized as income tax expense or benefit in the income statement during the period in which they occur. Previously, such amounts were recorded in the pool of excess tax benefits included in additional paid-in capital, if such pool was available. Because excess tax benefits are no longer recognized in additional paid-in capital, the assumed proceeds from applying the treasury stock method when computing earnings per share should exclude the amount of excess tax benefits that would have previously been recognized in additional paid-in capital. Additionally, excess tax benefits should be classified along with other income tax cash flows as an operating activity rather than a financing activity, as was previously the case. ASU 2016-09 also provides that an entity can make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest (current GAAP) or account for forfeitures when they occur. ASU 2016-09 changes the threshold to qualify for equity classification (rather than as a liability) to permit withholding up to the maximum statutory tax rates (rather than the minimum as was previously the case) in the applicable jurisdictions. ASU 2016-09 will become effective for interim and annual periods beginning after December 15, 2016. The Company elected to early adopt this ASU for the year ended December 31, 2016. The adoption of this ASU did not have a material impact on the Company’s financial position, results of operation, or EPS. 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. In addition, ASU 2016-13 amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. ASU 2016-13 will become effective for interim and annual periods beginning after December 15, 2019. Management is currently evaluating the potential impact of this update. 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. ASU 2016-15 became effective for the Company as of January 1, 2018 and it will not have a significant impact on our financial statements. In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805) - Clarifying the Definition of a Business.” ASU 2017-01 clarifies the definition and provides a more robust framework to use in determining when a set of assets and activities constitutes a business. ASU 2017-01 is intended to provide guidance when evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. ASU 2017-01 will become effective for interim and annual periods beginning after December 15, 2017. If this standard had been effective for the year ended December 31, 2017, there would have been no impact on our consolidated financial statements. 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 2017-01 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, 2017, 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 Company does not expect this update to have a material impact on its consolidated financial statements. In May 2017, the FASB issued ASU 2017-09, “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 2017-09, 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 2017-09 is effective for all entities beginning after December 15, 2017 including interim periods within the fiscal year. Early adoption is permitted. Upon adoption, the ASU will be applied prospectively to awards modified on or after the adoption date. The adoption of this update will not have a significant impact on its 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 has elected to early adopt this update effective January 1, 2018. If this standard had been effective for the year ended December 31, 2017, there would have been no 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.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2017 2016 2015 Basic earnings per share calculation: Net income $ 52,398 $ 40,591 $ 47,856 Weighted-average basic shares outstanding 27,627,228 19,165,182 17,180,000 Basic earnings per share $ 1.90 $ 2.12 $ 2.79 Diluted earnings per share: Net income $ 52,398 $ 40,591 $ 47,856 Weighted-average basic shares outstanding 27,627,228 19,165,182 17,180,000 Average diluted common shares outstanding 580,374 146,992 — Weighted-average diluted shares outstanding 28,207,602 19,312,174 17,180,000 Diluted earnings per share $ 1.86 $ 2.10 $ 2.79 Pro forma earnings per share: Pro forma net income $ 52,398 $ 39,422 $ 32,995 Weighted-average basic shares outstanding 27,627,228 19,165,182 17,180,000 Pro forma basic earnings per share $ 1.90 $ 2.06 $ 1.92 Pro forma diluted earnings per share: Pro forma net income $ 52,398 $ 39,422 $ 32,995 Weighted-average diluted shares outstanding 28,207,602 19,312,174 17,180,000 Pro forma diluted earnings per share $ 1.86 $ 2.04 $ 1.92

Mergers and acquisitions (Table

Mergers and acquisitions (Tables)	12 Months Ended
	Dec. 31, 2017
Clayton Banks
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	As of December 31, 2017, the Company has 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 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 Non-interest bearing deposits 309,464 Borrowings 84,831 Accrued expenses and other liabilities 5,245 Total liabilities $ 1,069,594 Net assets acquired (excluding goodwill recognized) $ 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 Allocation of consideration paid: Fair value of net assets acquired including identifiable intangible assets $ 146,161 Goodwill 90,323 Total consideration paid $ 236,484
Schedule of Fair Value of Acquired Purchase Credit Impaired Loans	The following table presents the fair value of acquired purchase credit impaired loans accounted for in accordance with ASC 310-30 from the Clayton Banks as of the July 31, 2017 acquisition date: July 31, 2017 Contractually-required principal and interest $ 115,448 Nonaccretable difference (12,430 ) Best estimate of contractual cash flows expected to be collected 103,018 Accretable yield (18,868 ) Fair value $ 84,150
Business Acquisition, Pro Forma Information	The pro forma information is not indicative of what would have occurred had the acquisition taken place on January 1, 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
Northwest Georgia Bank
Business Acquisition [Line Items]
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 September 18, 2015 acquisition date and the consideration paid and an allocation of the purchase price to net assets acquired: As of September 18, 2015 As Recorded by FB Financial Corporation Assets Cash and cash equivalents $ 25,495 Investment securities 133,124 FHLB stock 1,154 Loans 78,565 Allowance for loan losses - Premises and equipment 15,343 Other real estate owned 5,002 Intangibles, net 4,931 Other assets 8,735 Total assets $ 272,349 Liabilities Interest-bearing deposits $ 213,126 Non-interest bearing deposits 33,090 Borrowings 20,378 Accrued expenses and other liabilities 1,461 Total liabilities $ 268,055 Net assets acquired (excluding goodwill recognized) $ 4,294
Schedule of Consideration Paid and Allocation of Purchase Price to Net Assets Acquired	Purchase price: Cash Consideration paid $ 1,500 Allocation of consideration paid: Fair value of net assets acquired including identifiable intangible assets 4,294 Bargain purchase gain $ 2,794 (1)
Business Acquisition, Pro Forma Information	The pro forma information is not indicative of what would have occurred had the acquisition taken place on January 1, 2014 and does not include the effect of all cost-saving or revenue-enhancing strategies. Year Ended December 31, 2015 Net interest income $ 102,290 Total revenues $ 191,002 Net income $ 46,042

Cash and Cash Equivalents Con39

Cash and Cash Equivalents Concentrations (Tables)	12 Months Ended
	Dec. 31, 2017
Risks And Uncertainties [Abstract]
Schedule of Amounts Due from Correspondent Institutions having Concentration of Credit Risk	The Bank had amounts due from their correspondent institutions at December 31, 2017 and 2016, as follows: Bank Name 2017 2016 First Tennessee Bank, N.A. $ 2,477 $ 26,381 Federal Reserve Bank of Atlanta 22,103 61,623 JP Morgan Chase Bank, N.A. 3,138 2,272 Federal Home Loan Bank of Cincinnati 1,489 11,409 Fifth Third Bank 1,558 1,598 BBVA Compass 1,065 987 Zions Bank, N.A. 500 501 Servis First Bank 350 350 SunTrust Bank 230 232 PNC Bank, N.A. 211 213 First National Bankers Bank 200 200 US Bank, N.A. 98 — Wells Fargo Bank, N.A. 88 — Alostar Bank of Commerce 538 — Synovus Bank 291 1,062 $ 34,336 $ 106,828

Investment securities (Tables)

Investment securities (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2017 and 2016 are shown below: December 31, 2017 Amortized cost Gross unrealized gains Gross unrealized losses Fair Value 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 December 31, 2016 Amortized cost Gross unrealized gains Gross unrealized losses Fair Value Securities Available-for-Sale Debt securities U.S. government agency securities $ 998 $ — $ (13 ) $ 985 Mortgage-backed securities - residential 450,874 939 (7,905 ) 443,908 Municipals, tax exempt 116,034 3,003 (2,114 ) 116,923 Treasury securities 11,809 — (52 ) 11,757 Total debt securities 579,715 3,942 (10,084 ) 573,573 Equity securities 8,744 1 (135 ) 8,610 Total securities available-for-sale $ 588,459 $ 3,943 $ (10,219 ) $ 582,183
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, 2017 2016 Available-for-sale Available-for-sale Amortized cost Fair value Amortized cost Fair value Due in one year or less $ 905 $ 925 $ 9,290 $ 9,352 Due in one to five years 28,332 28,878 25,520 26,340 Due in five to ten years 19,218 19,588 31,122 32,248 Due in over ten years 67,016 68,098 62,909 61,725 115,471 117,489 128,841 129,665 Mortgage-backed securities - residential 425,557 418,781 450,874 443,908 Total debt securities $ 541,028 $ 536,270 $ 579,715 $ 573,573
Summary of Sales of Available-for-Sale Securities	Sales of available-for-sale securities were as follows: Year Ended December 31, 2017 2016 Proceeds from sales $ 94,743 $ 271,148 Gross realized gains 1,277 4,755 Gross realized losses 48 348 Other-than-temporary-impairment 945 —
Schedule of Gross Unrealized Losses	The Company also recognized $1 on gains related to the early call of available for sale securities during the year ended December 31, 2017. The following tables show gross unrealized losses at December 31, 2017 and 2016, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position: 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 December 31, 2016 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 $ 985 $ 13 $ — $ — $ 985 $ 13 Mortgage-backed securities - residential 390,595 7,230 19,073 675 409,668 7,905 Municipals, tax exempt 43,132 2,114 — — 43,132 2,114 Treasury securities 10,256 52 — — 10,256 52 Total debt securities 444,968 9,409 19,073 675 464,041 10,084 Equity securities — — 3,126 135 3,126 135 $ 444,968 $ 9,409 $ 22,199 $ 810 $ 467,167 $ 10,219
Schedule of Other Than Temporary Impairment, Credit Losses Recognized In Earnings	Changes in the amount of credit related losses recognized in earnings for which OTTI has been recognized are as follows: Balance as of January 1, 2017 $ — Additions related to credit losses for which OTTI was not previously recognized (945 ) Reductions for securities sold during the period — Reductions for securities where there is an intent to sell or requirement to sell — Increases in credit loss for which OTTI was previously recognized — Reductions for increases in cash flows expected to be collected — Balance as of December 31, 2017 $ (945 )

Loans and Allowance for Loan 41

Loans and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Loans Outstanding by Major Lending Classification	Loans outstanding at December 31, 2017 and 2016, by major lending classification are as follows: December 31, 2017 2016 Commercial and industrial $ 715,075 $ 386,233 Construction 448,326 245,905 Residential real estate: 1-to-4 family mortgage 480,989 294,924 Residential line of credit 194,986 177,190 Multi-family mortgage 62,374 44,977 Commercial real estate: Owner occupied 495,872 357,346 Non-owner occupied 551,588 267,902 Consumer and other 217,701 74,307 Gross loans 3,166,911 1,848,784 Less: Allowance for loan losses (24,041 ) (21,747 ) Net loans $ 3,142,870 $ 1,827,037
Schedule of Changes Value of Accretable Yield of PCI Loans	The following table presents changes in the value of the accretable yield for PCI loans for the periods indicated. Year Ended December 31, 2017 2016 2015 Balance at December 31, 2016 $ (2,444 ) $ (1,637 ) $ — Additions through the acquisition of the Clayton Banks (18,868 ) — (1,991 ) Principal reductions and other reclassifications from nonaccretable difference (1,841 ) (3,438 ) (100 ) Recoveries (23 ) — — Accretion 5,299 2,631 454 Other changes 195 — — Balance at December 31, 2017 $ (17,682 ) $ (2,444 ) $ (1,637 )
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, 2017, 2016 and 2015: 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 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, 2015 Beginning balance - December 31, 2014 $ 6,600 $ 3,721 $ 6,364 $ 2,790 $ 184 $ 6,075 $ 2,641 $ 655 $ 29,030 Provision for loan losses (624 ) 149 (1,521 ) (645 ) 127 (1,366 ) (307 ) 1,123 (3,064 ) Recoveries of loans previously charged-off 112 1,354 161 286 — 35 342 548 2,838 Loans charged off (953 ) (81 ) (828 ) (230 ) — (1,062 ) (54 ) (1,136 ) (4,344 ) Ending balance - December 31, 2015 $ 5,135 $ 5,143 $ 4,176 $ 2,201 $ 311 $ 3,682 $ 2,622 $ 1,190 $ 24,460
Allocation of Allowance for Loan Losses by Loan Category Broken Out Between Loans Individually and Collectively Evaluated for Impairment	The following table provides the allocation of the allowance for loan losses by loan category broken out between loans individually evaluated for impairment and loans collectively evaluated for impairment as of December 31, 2017, 2016 and 2015: 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 December 31, 2015 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 $ 89 $ 5 $ 66 $ — $ — $ 74 $ 739 $ — $ 973 Collectively evaluated for impairment 5,046 5,138 4,110 2,201 311 3,608 1,883 1,190 23,487 Acquired with deteriorated credit quality — — — — — — — — — Ending balance- December 31, 2015 $ 5,135 $ 5,143 $ 4,176 $ 2,201 $ 311 $ 3,682 $ 2,622 $ 1,190 $ 24,460
Amount of Loans by Loan Category Broken Between Loans Individually and Collectively Evaluated for Impairment	The following table provides the amount of loans by loan category broken between loans individually evaluated for impairment and loans collectively evaluated for impairment as of December 31, 2017, 2016 and 2015: 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 December 31, 2015 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 $ 1,499 $ 2,866 $ 3,686 $ — $ 1,074 $ 3,000 $ 3,451 $ — $ 15,576 Collectively evaluated for impairment 316,418 228,445 284,190 171,526 58,400 329,569 198,741 77,623 1,664,912 Acquired with deteriorated credit quality 874 6,859 2,828 — 36 5,095 5,679 4 21,375 Ending balance- December 31, 2015 $ 318,791 $ 238,170 $ 290,704 $ 171,526 $ 59,510 $ 337,664 $ 207,871 $ 77,627 $ 1,701,863
Credit Quality Indicators by Portfolio Class	The following table shows credit quality indicators by portfolio class at December 31, 2017 and 2016: 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 December 31, 2016 Pass Watch Substandard Total Loans, excluding purchased credit impaired loans Commercial and industrial $ 351,046 $ 31,074 $ 3,635 $ 385,755 Construction 236,588 4,612 386 241,586 Residential real estate: 1-to-4 family mortgage 277,948 6,945 7,924 292,817 Residential line of credit 173,011 1,875 2,304 177,190 Multi-family mortgage 43,770 152 1,027 44,949 Commercial real estate: Owner occupied 338,698 10,459 4,407 353,564 Non-owner occupied 249,877 10,273 2,412 262,562 Consumer and other 73,454 417 432 74,303 Total loans, excluding purchased credit impaired loans $ 1,744,392 $ 65,807 $ 22,527 $ 1,832,726 Purchased credit impaired loans Commercial and industrial $ — $ — $ 478 $ 478 Construction — — 4,319 4,319 Residential real estate: 1-to-4 family mortgage — — 2,107 2,107 Residential line of credit — — — — Multi-family mortgage — — 28 28 Commercial real estate: Owner occupied — — 3,782 3,782 Non-owner occupied — — 5,340 5,340 Consumer and other — — 4 4 Total purchased credit impaired loans $ — $ — $ 16,058 $ 16,058 Total loans $ 1,744,392 $ 65,807 $ 38,585 $ 1,848,784
Past Due Loans	The following table provides 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, 2017 and 2016: 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 December 31, 2016 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 $ 262 $ 127 $ 1,297 $ 384,069 $ 478 $ 386,233 Construction 441 17 254 240,874 4,319 245,905 Residential real estate: 1-to-4 family mortgage 3,130 697 2,289 286,701 2,107 294,924 Residential line of credit 1,139 433 601 175,017 — 177,190 Multi-family mortgage — — — 44,949 28 44,977 Commercial real estate: Owner occupied 186 — 2,007 351,371 3,782 357,346 Non-owner occupied 158 — 2,251 260,153 5,340 267,902 Consumer and other 433 55 30 73,785 4 74,307 Total $ 5,749 $ 1,329 $ 8,729 $ 1,816,919 $ 16,058 $ 1,848,784
Impaired Loans Recognized, Segregated by Class	Impaired loans recognized in conformity with ASC 310 at December 31, 2017 and 2016, segregated by class, were as follows: 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 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, 2016 Recorded investment Unpaid principal Related allowance With a related allowance recorded: Commercial and industrial $ 854 $ 854 $ 135 Construction — — — Residential real estate: 1-to-4 family mortgage 103 369 23 Residential line of credit — — — Multi-family mortgage — — — Commercial real estate: Owner occupied 635 654 113 Non-owner occupied 1,151 1,678 242 Consumer and other 1 1 — Total $ 2,744 $ 3,556 $ 513 With no related allowance recorded: Commercial and industrial $ 622 $ 746 $ — Construction 2,686 2,694 — Residential real estate: 1-to-4 family mortgage 2,368 2,370 — Residential line of credit 311 321 — Multi-family mortgage 1,027 1,027 — Commercial real estate: Owner occupied 2,117 3,205 — Non-owner occupied 1,050 1,781 — Consumer and other 26 26 — Total $ 10,207 $ 12,170 $ — Total impaired loans $ 12,951 $ 15,726 $ 513 December 31, 2017 2016 2015 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 $ 454 $ 2 $ 994 $ 17 $ 1,269 $ 22 Construction — — 154 — 517 3 Residential real estate: 1-to-4 family mortgage 149 9 1,750 1 2,345 199 Residential line of credit — — — — — — Multi-family mortgage — — — — 468 — Commercial real estate: Owner occupied 740 48 1,756 25 1,938 95 Non-owner occupied 648 5 1,777 — 3,039 — Consumer and other 1 — 1 — — — Total $ 1,992 $ 64 $ 6,432 $ 43 $ 9,576 $ 319 With no related allowance recorded Commercial and industrial $ 1,074 $ 38 $ 494 $ 20 $ 660 $ — Construction 1,988 46 2,622 132 4,337 127 Residential real estate: 1-to-4 family mortgage 1,718 63 1,329 137 2,815 7 Residential line of credit 156 — 156 10 — — Multi-family mortgage 1,003 46 1,051 37 652 25 Commercial real estate: Owner occupied 1,897 122 1,120 119 788 — Non-owner occupied 1,313 19 1,050 — 855 — Consumer and other 26 1 13 — — — Total $ 9,173 $ 335 $ 7,835 $ 455 $ 10,107 $ 159 Total impaired loans $ 11,164 $ 399 $ 14,267 $ 498 $ 19,683 $ 478
Financial Effect of TDRs	The following table presents the financial effect of TDRs recorded during the periods indicated: 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-to-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 $ — Year ended December 31, 2015 Number of loans Pre-modification outstanding recorded investment Post-modification outstanding recorded investment Charge offs and specific reserves Commercial and industrial 6 $ 2,301 $ 2,301 $ 86 Commercial real estate: Owner occupied 4 786 786 — Non-owner occupied 1 133 133 1 Residential real estate: 1-4 family mortgage 5 326 326 45 Total 16 $ 3,546 $ 3,546 $ 132
Loans Modified as Troubled Debt Restructurings for Payment Default	The following presents loans modified as troubled debt restructurings for which there was a payment default within twelve months following the modification during the year ended December 31, 2015: Defaulted Charge-offs and specific reserves Residential real estate: 1-to-4 family mortgage $ 145 $ 45 Total $ 145 $ 45

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2017 and 2016, are as follows: 2017 2016 Land $ 22,108 $ 18,698 Premises 57,719 44,301 Furniture and fixtures 22,292 21,700 Leasehold improvements 10,740 10,515 Equipment 12,525 11,583 Construction in process 1,496 867 126,880 107,664 Less: accumulated depreciation (45,303 ) (41,013 ) Total Premises and Equipment $ 81,577 $ 66,651

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2017
Real Estate [Abstract]
Summary of Other Real Estate Owned	The following table summarizes the other real estate owned for the years ended December 31, 2017, 2016 and 2015: Year Ended December 31, 2017 2016 2015 Balance at beginning of period $ 7,403 $ 11,641 $ 7,259 Transfers from loans 3,605 2,724 4,085 Transfers from premises and equipment 3,466 — Capital improvements — — 171 Acquired through merger or acquisition 6,888 — 5,002 Properties sold (5,438 ) (6,696 ) (3,774 ) Gain on sale of other real estate owned 1,080 1,670 187 Transferred to loans (256 ) (1,548 ) (785 ) Write-downs and partial liquidations (306 ) (388 ) (504 ) Balance at end of period $ 16,442 $ 7,403 $ 11,641

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Changes in Goodwill	The following table summarizes changes in goodwill during the year ended December 31, 2017. Goodwill Balance at December 31, 2016 $ 46,867 Addition from merger with Clayton Banks (see Note 2) 90,323 Balance at December 31, 2017 $ 137,190
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, 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 December 31, 2016 Core deposit intangible $ 29,855 $ (25,292 ) $ 4,563 December 31, 2015 Core deposit intangible $ 29,855 $ (23,160 ) $ 6,695
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, 2018 $ 3,275 December 31, 2019 2,866 December 31, 2020 2,476 December 31, 2021 2,090 December 31, 2022 1,609 Thereafter 2,586 $ 14,902

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2017, 2016 and 2015: Year Ended December 31, 2017 2016 2015 Carrying value prior to policy change $ 32,070 $ 29,711 $ 6,032 Fair value impact of change in accounting policy (See Note 1) 1,011 — — Carrying value at beginning of period 33,081 29,711 6,032 Capitalization 58,984 46,070 26,474 Amortization — (8,321 ) (2,601 ) Sales (11,686 ) (34,118 ) — (Loss) gain on sale (249 ) 3,406 — Impairment — (4,678 ) (194 ) Change in fair value: Due to pay-offs/pay-downs (3,104 ) — — Due to change in valuation inputs or assumptions (919 ) — — Carrying value at December 31 $ 76,107 $ 32,070 $ 29,711
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, 2017, 2016 and 2015, respectively: Year Ended December 31, 2017 2016 2015 Servicing income: Servicing income $ 13,168 $ 12,063 $ 3,614 Change in fair value of mortgage servicing rights (4,023 ) — Change in fair value of derivative hedging instruments 599 — — Total servicing income 9,744 12,063 3,614 Servicing expenses: Servicing asset amortization — 8,321 2,601 Servicing asset impairment — 4,678 194 Loss on sale of mortgage servicing rights and related hedges and transaction costs on sale 249 4,447 — Other servicing expenses 4,896 2,325 633 Total servicing expenses 5,145 19,771 3,428 Net servicing income (loss) $ 4,599 $ (7,708 ) $ 186
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, 2017 and 2016 are as follows: As of December 31, 2017 2016 Unpaid principal balance $ 6,529,431 $ 2,833,958 Weighted-average prepayment speed (CPR) 8.90 % 8.40 % Estimated impact on fair value of a 10% increase (3,026 ) (1,256 ) Estimated impact on fair value of a 20% increase (5,855 ) (2,434 ) Discount rate 9.75 % 9.54 % Estimated impact on fair value of a 100 bp increase (3,052 ) (1,394 ) Estimated impact on fair value of a 200 bp increase (5,867 ) (2,679 ) Weighted-average coupon interest rate 3.94 % 3.59 % Weighted-average servicing fee (basis points) 28 27 Weighted-average remaining maturity (in months) 335 328

Other Assets and Other liabil46

Other Assets and Other liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Other Assets And Other Liabilities [Abstract]
Summary of Other Assets	Included in other assets are: As of December 31, Other assets 2017 2016 Cash surrender value on bank owned life insurance $ 10,873 $ 10,556 Prepaid expenses 2,477 2,245 Software 1,962 2,296 Mortgage lending receivable 3,176 24 Derivatives 9,690 19,745 Other assets 16,038 16,488 Total other assets $ 44,216 $ 51,354
Summary of Other Liabilities	Included in other liabilities are: As of December 31, Other liabilities 2017 2016 Deferred compensation $ 5,301 $ 6,710 Accrued payroll 11,018 5,987 Mortgage servicing escrows 3,341 1,079 Mortgage buyback reserve 3,386 2,659 Accrued interest 1,504 632 Derivatives 1,699 586 Deferred tax liability (See Note 15) 11,858 4,180 Right to repurchase GNMA loans serviced (See Note 1) 43,035 — Other liabilities 37,852 36,535 Total other liabilities $ 118,994 $ 58,368

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2017
Time Deposits [Abstract]
Schedule of Maturities of Time Deposits	At December 31, 2017, the scheduled maturities of time deposits are as follows: Scheduled maturities of time deposits Due on or before: December 31, 2018 $ 432,030 December 31, 2019 139,398 December 31, 2020 56,719 December 31, 2021 32,893 December 31, 2022 24,075 Thereafter 3,214 Total $ 688,329

Securities Sold Under Agreeme48

Securities Sold Under Agreements to Repurchase (Tables)	12 Months Ended
	Dec. 31, 2017
Securities Sold Under Agreements To Repurchase [Abstract]
Summary of Balances for Securities Sold Under Agreements to Repurchase	Information concerning securities sold under agreements to repurchase is summarized as follows: 2017 2016 Balance at year end $ 14,293 $ 21,561 Average daily balance during the year 16,326 60,331 Average interest rate during the year 0.17 % 0.11 % Maximum month-end balance during the year 19,432 115,005 Weighted average interest rate at year-end 0.16 % 0.17 %

Long-term Debt (Tables)

Long-term Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Schedule of Maturities of Long-term Debt	Maturities of long-term debt as of December 31, 2017 are as follows: FHLB Junior Subordinated debt Total Due on or before: December 31, 2018 $ 109,712 (1) $ — $ 109,712 (1) December 31, 2019 224 — 224 December 31, 2020 131 — 131 December 31, 2021 418 — 418 December 31, 2022 890 — 890 Due thereafter 997 30,930 31,927 Total $ 112,372 $ 30,930 $ 143,302 (1) Includes $100,000 of advances with 90 day fixed rate repricing terms that are being hedged with interest rate swaps maturing in 2020, 2021, and 2022 in increments of $30,000, $35,000 and $35,000, respectively. As such, these advances are classified as long-term debt on the consolidated balance sheets.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
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: December 31, 2017 2016 2015 Current $ 14,629 $ 12,476 $ 1,321 Deferred 6,458 9,257 1,647 Total $ 21,087 $ 21,733 $ 2,968
Schedule of Reconciliation of Income Taxes Computed at the United States Federal Statutory Tax Rates to the Provision for Income Taxes	The reconciliation of income taxes computed at the United States federal statutory tax rates to the provision for income taxes is as follows, for the periods presented: December 31, 2017 2016 2015 Federal taxes calculated at statutory rate $ 25,720 $ 5,061 $ — Increase (decrease) resulting from: State taxes, net of federal benefit 3,053 3,664 2,956 Revaluation of net deferred tax liability as a result of the Tax Cuts and Jobs Act (5,894 ) — — Conversion as of September 16, 2016 to C Corporation — 13,181 — Benefit of equity based compensation (310 ) (786 ) — Permanent items (1,402 ) (633 ) 12 Other (80 ) 1,246 — Income tax expense, as reported $ 21,087 $ 21,733 $ 2,968
Schedule of Net Deferred Tax liability	The components of the net deferred tax liability at December 31, 2017 and 2016, are as follows: For the year ended December 31, 2017 2016 Deferred tax assets: Allowance for loan losses $ 6,264 $ 8,516 Amortization of core deposit intangible 759 996 Compensation related 6,158 7,552 Unrealized loss on securities 988 2,462 Other 3,599 2,430 Subtotal 17,768 21,956 Deferred tax liabilities: FHLB stock dividends (550 ) (827 ) Depreciation (4,115 ) (6,548 ) Mortgage servicing rights (19,830 ) (12,558 ) Other (5,131 ) (6,203 ) Subtotal (29,626 ) (26,136 ) Net deferred tax liability $ (11,858 ) $ (4,180 )

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Summary of Financial instruments with Off-Balance Sheet Credit Risk	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. Year Ended December 31, 2017 2016 Commitments to extend credit, excluding interest rate lock commitments $ 977,276 $ 579,879 Letters of credit 22,882 22,547 Balance at end of period $ 1,000,158 $ 602,426
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: 2018 $ 3,533 2019 2,806 2020 2,318 2021 2,074 2022 1,623 Thereafter 5,350 Total $ 17,704
Summary of Allowance for Loan Repurchases or Indemnifications	The following table summarizes the activity in the repurchase reserve: For the year ended December 31, 2017 2016 2015 Balance at beginning of period $ 2,659 $ 2,156 $ 828 Provision for loan repurchases or indemnifications 810 512 1,375 Recoveries on previous losses — 9 — Losses on loans repurchased or indemnified (83 ) (18 ) (47 ) Balance at end of period $ 3,386 $ 2,659 $ 2,156

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2017
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, 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 — Option contracts 6,000 29 — Total $ 1,810,484 $ 8,258 $ 1,699 December 31, 2016 Notional Amount Asset Liability Not designated as hedging: Interest rate contracts $ 22,243 $ 586 $ 586 Forward commitments 829,000 12,731 — Interest rate-lock commitments 532,920 6,428 — Futures contracts — — — Total $ 1,384,163 $ 19,745 $ 586 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, 2017 2016 2015 Not designated as hedging instruments (included in mortgage banking income): Interest rate lock commitments $ 340 $ 835 $ 2,073 Forward commitments (11,987 ) 10,497 (3,600 ) Futures contracts 315 — — Option contracts 22 — — Total $ (11,310 ) $ 11,332 $ (1,527 ) Year Ended December 31, 2017 2016 2015 Designated as hedging: Amount of gain reclassified from other comprehensive income and recognized in interest expense on long-term debt $ 168 $ — $ — Included in loss on sale of mortgage servicing rights — (5,569 ) — Total $ 168 $ (5,569 ) $ — The following discloses the amount included in other comprehensive income, net of tax, for derivative instruments designated as cash flow hedges for the periods presented: Year Ended December 31, 2017 2016 2015 Designated as hedging: Amount of gain recognized in other comprehensive income, net of tax $ 685 $ — $ —

Fair Value of Financial Instr53

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Estimated Fair Values of Financial Instruments	The estimated fair values of the Company’s financial instruments are as follows: 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 Available-for-sale securities 543,992 — 540,388 3,604 543,992 Federal Home Loan Bank Stock 11,412 — — 11,412 11,412 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 repurchase 14,293 14,293 — — 14,293 Short term borrowings 190,000 190,000 — — 190,000 Interest payable 1,504 575 929 — 1,504 Long-term debt 143,302 — 149,135 — 149,135 Derivatives 1,699 — 1,699 — 1,699 Fair Value December 31, 2016 Carrying amount Level 1 Level 2 Level 3 Total Financial assets: Cash and cash equivalents $ 136,327 $ 136,327 $ — $ — $ 136,327 Available-for-sale securities 582,183 — 577,634 4,549 582,183 Federal Home Loan Bank Stock 7,743 — — 7,743 7,743 Loans, net 1,827,037 — 1,822,054 1,281 1,823,335 Loans held for sale 507,442 — 507,442 — 507,442 Interest receivable 7,241 — 7,241 — 7,241 Mortgage servicing rights, net 32,070 — — 33,081 33,081 Derivatives 19,745 — 19,745 — 19,745 Financial liabilities: Deposits: Without stated maturities $ 2,280,531 $ 2,280,531 $ — $ — $ 2,280,531 With stated maturities 391,031 — 390,484 — 390,484 Securities sold under agreement to repurchase 21,561 21,561 — — 21,561 Short term borrowings 150,000 150,000 — — 150,000 Interest payable 632 249 383 — 632 Long-term debt 44,892 — 47,377 — 47,377 Derivatives 586 — 586 — 586
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, 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 recurring basis at December 31, 2016 are presented in the following table: At December 31, 2016 Quoted prices in active markets for identical (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 $ — $ 985 $ — $ 985 Mortgage-backed securities — 443,908 — 443,908 Municipals, tax-exempt — 116,923 — 116,923 Treasury securities — 11,757 — 11,757 Equity securities — 4,061 4,549 8,610 Total $ — $ 577,634 $ 4,549 $ 582,183 Loans held for sale — 507,442 — 507,442 Derivatives — 19,745 — 19,745 Financial Liabilities: Derivatives $ — $ 586 $ — $ 586
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: 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 The balances and levels of the assets measured at fair value on a non-recurring basis at December 31, 2016 are presented in the following table: At December 31, 2016 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 $ — $ — $ 2,315 $ 2,315 Mortgage servicing rights — — 32,070 32,070 Impaired Loans: Commercial and industrial — — 542 542 Residential real estate: 1-4 family mortgage — — 103 103 Commercial real estate: Owner occupied — — 635 635 Consumer and other — — 1 1 Total $ — $ — $ 1,281 $ 1,281
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, 2017 and 2016: Available-for-sale securities Year Ended December 31, 2017 2016 Balance at beginning of period $ 4,549 $ 4,856 Realized gains included in net income — — Unrealized gains included in other comprehensive income — — Impairment of equity securities (945 ) — Purchases — — Capital distribution — (307 ) Balance at end of period $ 3,604 $ 4,549
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, 2017 about significant unobservable inputs (Level 3) used in the valuation of assets measured at fair value on a nonrecurring basis: Financial instrument Fair Valuation technique Significant Unobservable inputs Range of inputs Impaired loans $ 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% The following table presents information as of December 31, 2016 about significant unobservable inputs (Level 3) used in the valuation of assets measured at fair value on a nonrecurring basis: Financial instrument Fair Valuation technique Significant Unobservable inputs Range of inputs Impaired loans $ 1,281 Valuation of collateral Discount for comparable sales 0%-30% Other real estate owned $ 2,315 Appraised value of property less costs to sell Discount for costs to sell 0%-10% Mortgage servicing rights, net $ 33,081 Discounted cash flows See Note 9 See Note 9
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, 2017 and 2016: December 31, 2017 Aggregate fair value Aggregate Unpaid Principal Balance Difference 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 — December 31, 2016 Mortgage loans held for sale measured at fair value $ 507,442 $ 501,503 $ 5,939 Past due loans of 90 days or more — — — Nonaccrual loans — — —

Parent Company Only Financial54

Parent Company Only Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Balance Sheet	As of December 31, Balance sheet 2017 2016 Assets Cash and cash equivalents (1) $ 25,789 $ 30,993 Investments 1,129 2,074 Investments in Bank subsidiary (1) 595,625 325,574 Other assets 5,411 2,972 Goodwill 29 29 Total assets $ 627,983 $ 361,642 Liabilities and shareholders' equity Liabilities Long-term debt $ 30,930 $ 30,930 Accrued expenses and other liabilities 324 214 Total liabilities $ 31,254 $ 31,144 Shareholders' equity Common stock $ 30,536 $ 24,108 Additional paid-in capital 418,596 213,480 Retained earnings 147,449 93,784 Accumulated other comprehensive (loss) income 148 (874 ) Total shareholders' equity $ 596,729 $ 330,498 Total liabilities and shareholders' equity $ 627,983 $ 361,642 (1) Eliminates in Consolidation
Income Statements	For the years ended December 31, Income Statements 2017 2016 2015 Income Other interest income $ 41 $ 33 $ 33 Interest income from Bank subsidiary (1) — 95 121 Gain (loss) on investments (945 ) 417 — Dividend income from Bank subsidiary (1) — 14,875 25,105 Earnings from Bank subsidiary (1) 54,713 26,859 23,879 Total income $ 53,809 $ 42,279 $ 49,138 Expenses Interest expense $ 1,491 $ 1,393 $ 1,298 Salaries, legal and professional fees 893 315 3 Other noninterest expense 296 168 59 Federal and state income tax benefit (1,269 ) (188 ) (78 ) Total expenses $ 1,411 $ 1,688 $ 1,282 Net income $ 52,398 $ 40,591 $ 47,856 (1) Eliminates in Consolidation
Statement of Cash Flows	For the years ended December 31, Statement of Cash Flows 2017 2016 2015 Operating Activities Net income $ 52,398 $ 40,591 $ 47,856 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed income of subsidiary bank (54,713 ) (26,859 ) (23,879 ) Loss (gain) on investments 945 (417 ) — Stock-based compensation expense — 4,693 — (Increase) decrease in other assets (2,439 ) (427 ) 1,292 Increase (decrease) in other liabilities (551 ) (5,251 ) 23 Other, net - 7 (1 ) Net cash provided by operating activities $ (4,360 ) $ 12,337 $ 25,291 Investing Activities Other investments $ — $ 724 $ 761 Net cash provided by investing activities $ — $ 724 $ 761 Financing Activities Equity contribution to Bank $ (154,200 ) $ (20,000 ) $ — Payment of dividends — (69,300 ) (25,350 ) Payment of subordinated debt — (10,075 ) — Net proceeds from sale of common stock 153,356 116,054 — Net cash (used in) provided by financing activities $ (844 ) $ 16,679 $ (25,350 ) Net (decrease) increase in cash and cash equivalents (5,204 ) 29,740 702 Cash and Cash Equivalents at beginning of year 30,993 1,253 551 Cash and Cash Equivalents at end of year $ 25,789 $ 30,993 $ 1,253 Supplemental noncash disclosures: 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, 2017
Segment Reporting [Abstract]
Schedule of Segment Financial Information	The following tables provides segment financial information for the years ended December 31, 2017, 2016 and 2015 follows: 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 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 related to the merger with the Clayton Banks. 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 related to the acquisition of NWGB. Year Ended December 31, 2015 Banking Mortgage Consolidated Net interest income $ 92,366 $ 1,506 $ 93,872 Provision for loan loss (3,070 ) 6 (3,064 ) Mortgage banking income 18,718 51,472 70,190 Other noninterest income 22,190 — 22,190 Depreciation and amortization 2,933 350 3,283 Amortization of intangibles 1,731 — 1,731 Amortization and impairment of mortgage servicing rights — 2,795 2,795 Other noninterest mortgage banking expense 13,189 42,949 56,138 Other noninterest expense (1) 74,545 — 74,545 Income before income taxes 43,946 6,878 50,824 Income tax expense 2,968 Net income 47,856 Total assets $ 2,570,071 $ 329,349 $ 2,899,420 Goodwill 46,804 100 46,904

Minimum Capital Requirements (T

Minimum Capital Requirements (Tables)	12 Months Ended
	Dec. 31, 2017
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 Minimum Capital adequacy with capital buffer To be well capitalized under action provisions Amount Ratio Amount Ratio Amount Ratio Amount Ratio December 31, 2017 Total Capital (to risk-weighted assets) FB Financial Corporation $ 496,422 12.01 % $ 330,672 8.0 % $ 382,340 9.25 % N/A N/A FirstBank 466,102 11.30 % 329,984 8.0 % 381,544 9.25 % $ 412,480 10.0 % Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 472,381 11.43 % $ 247,969 6.0 % $ 299,629 7.25 % N/A N/A FirstBank 442,061 10.72 % 247,422 6.0 % 298,968 7.25 % $ 247,422 6.0 % Tier 1 Capital (to average assets) FB Financial Corporation $ 472,381 10.46 % $ 180,643 4.0 % N/A N/A N/A N/A FirstBank 442,061 9.77 % 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 10.71 % $ 185,874 4.5 % $ 237,506 5.75 % N/A N/A FirstBank 442,061 10.72 % 185,567 4.5 % 237,113 5.75 % $ 268,041 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, 2016 Total Capital (to risk-weighted assets) FB Financial Corporation $ 338,893 13.03 % $ 208,069 8.0 % $ 224,325 8.63 % N/A N/A FirstBank 304,018 11.72 % 207,521 8.0 % 223,733 8.63 % $ 259,401 10.0 % Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 317,146 12.19 % $ 156,101 6.0 % $ 172,362 6.63 % N/A N/A FirstBank 282,271 10.88 % 155,664 6.0 % 171,879 6.63 % $ 155,664 6.0 % Tier 1 Capital (to average assets) FB Financial Corporation $ 317,146 10.05 % $ 126,227 4.0 % N/A N/A N/A N/A FirstBank 282,271 8.95 % 126,155 4.0 % N/A N/A $ 157,693 5.0 % Common Equity Tier 1 Capital (to risk-weighted assets) FB Financial Corporation $ 287,146 11.04 % $ 117,043 4.5 % $ 133,299 5.13 % N/A N/A FirstBank 282,271 10.88 % 116,748 4.5 % 132,963 5.13 % $ 168,636 6.5 %

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Vested and Unvested Restricted Stock Units Outstanding	The following table summarizes information about vested and unvested restricted stock units outstanding at December 31, 2016: For the year ended December 31, 2017 2016 Restricted Stock Units Outstanding Weighted Average Grant Date Fair Value Restricted Stock Units Outstanding Weighted Average Grant Date Fair Value Balance at beginning of period 1,200,840 $ 19.00 — Conversion of deferred compensation plan — 19.00 157,895 19.00 Conversion of equity based incentive (EBI) plans — 19.00 125,684 19.00 Grants 123,169 35.15 1,077,066 19.00 Released and distributed (vested) (103,639 ) 21.25 (157,748 ) 19.00 Forfeited/expired (6,045 ) 19.00 (2,057 ) 19.00 Balance at end of period 1,214,325 $ 19.97 1,200,840 19.00

Related party transactions (Tab

Related party transactions (Tables)	12 Months Ended
	Dec. 31, 2017
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, 2017 $ 27,370 New loans and advances 1,204 Change in related party status (624 ) Repayments (6,938 ) Loans outstanding at December 31, 2017 $ 21,012

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Details)	May 26, 2017USD ($)$ / sharesshares	Jan. 02, 2017USD ($)	Sep. 15, 2016USD ($)$ / sharesshares	Aug. 15, 2016USD ($)	Jun. 28, 2016shares	Dec. 31, 2017USD ($)Method$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares	Dec. 31, 2015USD ($)shares	Jul. 31, 2016shares
Class Of Stock [Line Items]
Description of stock split						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.
Stock split ratio					0.01
Common stock, shares issued | shares						30,535,517	24,107,660
Common stock, shares authorized | shares						75,000,000	75,000,000
Proceeds from issuance of common stock, net of offering costs						$ 153,356,000	$ 116,054,000
Common stock sold and issued, par value | $ / shares						$ 1	$ 1
Other than temporary impairment						$ 945,000
Percent of remaining principal allowed to buy back under GNMA optional repurchase programs						100.00%
Loans individually evaluated for impairment						$ 9,373,000	$ 12,951,000	$ 15,576,000
Loans collectively evaluated for impairment						3,068,703,000	1,819,775,000	1,664,912,000
Impairment losses on mortgage servicing rights							4,678,000	194,000
Goodwill impairment loss						$ 0	0	0
Deferred tax liability increased due to change in taxable status							13,181,000
Income tax examination, description						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.
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						$ 12,957,000	$ 10,608,000	$ 8,062,000
Dilutive instruments outstanding | shares						580,374	146,992	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						$ 11,706,000	$ 18,000,000	$ 5,000,000
Mortgage Loans
Class Of Stock [Line Items]
Net (losses) gains from fair value changes of mortgage loans						9,111,000	$ (2,289,000)	$ 2,257,000
GNMA
Class Of Stock [Line Items]
Residential mortgage loans transferred by bank						$ 43,035,000
Pro forma
Class Of Stock [Line Items]
Effective tax rate							36.75%	35.08%
Initial Public Offering
Class Of Stock [Line Items]
Common stock sold and issued, shares | shares			6,764,704
Common stock sold and issued, price 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	$ 10,075,000
Private Placement
Class Of Stock [Line Items]
Common stock sold and issued, shares | shares	4,806,710
Common stock sold and issued, price per share | $ / shares	$ 33
Proceeds from issuance of common stock, net of offering costs	$ 152,721,000
Common stock sold and issued, par value | $ / shares	$ 1
Placement agent and other offering costs	$ 5,901,000
Minimum
Class Of Stock [Line Items]
Common stock, shares issued | shares					171,800
Common stock, shares authorized | shares					250,000				25,000,000
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
Maximum
Class Of Stock [Line Items]
Common stock, shares issued | shares					17,180,000
Common stock, shares authorized | shares					25,000,000				75,000,000
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

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Basic earnings per share calculation:
Net income	$ 52,398	$ 40,591	$ 47,856
Weighted-average basic shares outstanding	27,627,228	19,165,182	17,180,000
Basic earnings per share	$ 1.90	$ 2.12	$ 2.79
Diluted earnings per share:
Net income	$ 52,398	$ 40,591	$ 47,856
Weighted-average basic shares outstanding	27,627,228	19,165,182	17,180,000
Average diluted common shares outstanding	580,374	146,992	0
Weighted-average diluted shares outstanding	28,207,602	19,312,174	17,180,000
Diluted earnings per share	$ 1.86	$ 2.10	$ 2.79
Pro forma earnings per share:
Pro forma net income	$ 52,398	$ 39,422	$ 32,995
Weighted-average basic shares outstanding	27,627,228	19,165,182	17,180,000
Pro forma basic earnings per share	$ 1.90	$ 2.06	$ 1.92
Pro forma diluted earnings per share:
Pro forma net income	$ 52,398	$ 39,422	$ 32,995
Weighted-average diluted shares outstanding	28,207,602	19,312,174	17,180,000
Pro forma diluted earnings per share	$ 1.86	$ 2.04	$ 1.92

Mergers and acquisitions - Addi

Mergers and acquisitions - Additional Information (Details)		Feb. 08, 2017USD ($)shares	Sep. 18, 2015USD ($)	Jul. 31, 2017USD ($)BankingOffice		Dec. 31, 2017USD ($)Branch	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Business Acquisition [Line Items]
Goodwill						$ 137,190,000	$ 46,867,000	$ 46,904,000
Merger and conversion						19,034,000	3,268,000	3,543,000
Business combination, deferred taxes						$ 17,768,000	21,956,000
Business combination, bargain purchase gain								2,794,000
Core deposit intangible asset				$ 587,000
Clayton Banks
Business Acquisition [Line Items]
Business acquisition, date of acquisition agreement						Feb. 8, 2017
Acquisition purchase price		$ 236,484,000		236,484,000
Business acquisition, shares issued | shares		1,521,200
Cash purchase price		$ 184,200,000		$ 184,200,000	[1]
Number of banking offices | BankingOffice				18
Goodwill				$ 90,323,000
Merger and conversion						$ 19,034,000
Charitable contributions						$ 10,000,000
Business combination, deferred taxes				$ 0
Number of years of deductibility for income tax of the goodwill and core deposit intangible				15 years
Northwest Georgia Bank
Business Acquisition [Line Items]
Business acquisition, date of acquisition agreement						Apr. 27, 2015
Cash purchase price			$ 1,500,000
Merger and conversion							$ 3,268,000	$ 3,543,000
Business combination, deferred taxes			0
Business acquisition, effective date of acquisition						Sep. 18, 2015
Number of branches operated prior to acquisition | Branch						6
Business combination, bargain purchase gain	[2]		2,794,000
Core deposit intangible asset			$ 4,931,000
Estimated useful life of intangible assets			10 years
Deferred tax liability recorded in bargain purchase gain			$ 191,000
Number of years of deductibility for income tax of the core deposit intangible			15 years
[1]	Amount was deposited into an interest-bearing deposit account with the Bank in the name of the Seller as of July, 31, 2017.
[2]	The bargain purchase gain resulting from the merger has been recognized in the Banking operating segment during the year ended December 31, 2015.

Mergers and acquisitions - Sche

Mergers and acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Sep. 18, 2015
Clayton Banks
Assets
Cash and cash equivalents	$ 49,059
Investment securities	59,493
FHLB stock	3,409
Loans	1,059,728
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 (excluding goodwill recognized)	$ 146,161
Northwest Georgia Bank
Assets
Cash and cash equivalents		$ 25,495
Investment securities		133,124
FHLB stock		1,154
Loans		78,565
Premises and equipment		15,343
Other real estate owned		5,002
Intangibles, net		4,931
Other assets		8,735
Total assets		272,349
Liabilities
Interest-bearing deposits		213,126
Non-interest bearing deposits		33,090
Borrowings		20,378
Accrued expenses and other liabilities		1,461
Total liabilities		268,055
Net assets acquired (excluding goodwill recognized)		$ 4,294

Mergers and acquisitions - Sc63

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	Sep. 18, 2015	Jul. 31, 2017		Dec. 31, 2017	Dec. 31, 2015	Dec. 31, 2016
Equity consideration
Total equity consideration						$ 52,284
Allocation of consideration paid:
Goodwill						$ 137,190	$ 46,904	$ 46,867
Total consideration paid				$ 236,484
Bargain purchase gain							$ 2,794
Clayton Banks
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		184,200	[1]
Total consideration paid		$ 236,484		236,484
Allocation of consideration paid:
Fair value of net assets acquired including identifiable intangible assets				146,161
Goodwill				$ 90,323
Clayton Banks | Common Stock
Equity consideration
Common stock issued				1,521,200
Northwest Georgia Bank
Equity consideration
Cash consideration			$ 1,500
Allocation of consideration paid:
Fair value of net assets acquired including identifiable intangible assets			4,294
Bargain purchase gain	[2]		$ 2,794
[1]	Amount was deposited into an interest-bearing deposit account with the Bank in the name of the Seller as of July, 31, 2017.
[2]	The bargain purchase gain resulting from the merger has been recognized in the Banking operating segment during the year ended December 31, 2015.

Mergers and acquisitions - Sc64

Mergers and acquisitions - Schedule of Fair Value of Acquired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jul. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Fair value	$ 88,835		$ 16,058	$ 21,375
Clayton Banks
Business Acquisition [Line Items]
Contractually-required principal and interest		$ 115,448
Nonaccretable difference		(12,430)
Best estimate of contractual cash flows expected to be collected		103,018
Accretable yield		(18,868)
Fair value		$ 84,150

Mergers and acquisitions - Busi

Mergers and acquisitions - Business Acquisition, Pro Forma Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Clayton Banks
Business Acquisition [Line Items]
Net interest income	$ 192,633	$ 171,383
Total revenues	336,404	322,045
Net income	$ 75,659	$ 64,608
Northwest Georgia Bank
Business Acquisition [Line Items]
Net interest income			$ 102,290
Total revenues			191,002
Net income			$ 46,042

Cash and Cash Equivalents Con66

Cash and Cash Equivalents Concentrations - Schedule of Amounts Due from Correspondent Institutions having Concentration of Credit Risk (Details) - Credit Concentration Risk - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Cash due from Correspondent institutions	$ 34,336	$ 106,828
First Tennessee Bank, N.A.
Concentration Risk [Line Items]
Cash due from Correspondent institutions	2,477	26,381
Federal Reserve Bank of Atlanta
Concentration Risk [Line Items]
Cash due from Correspondent institutions	22,103	61,623
JP Morgan Chase Bank, N.A.
Concentration Risk [Line Items]
Cash due from Correspondent institutions	3,138	2,272
Fifth Third Bank
Concentration Risk [Line Items]
Cash due from Correspondent institutions	1,558	1,598
BBVA Compass
Concentration Risk [Line Items]
Cash due from Correspondent institutions	1,065	987
Zions Bank, N.A.
Concentration Risk [Line Items]
Cash due from Correspondent institutions	500	501
Servis First Bank
Concentration Risk [Line Items]
Cash due from Correspondent institutions	350	350
Sun Trust Bank
Concentration Risk [Line Items]
Cash due from Correspondent institutions	230	232
PNC Bank, N.A.
Concentration Risk [Line Items]
Cash due from Correspondent institutions	211	213
First National Bankers Bank
Concentration Risk [Line Items]
Cash due from Correspondent institutions	200	200
US Bank, N.A.
Concentration Risk [Line Items]
Cash due from Correspondent institutions	98
Wells Fargo Bank, N.A.
Concentration Risk [Line Items]
Cash due from Correspondent institutions	88
Alostar Bank of Commerce
Concentration Risk [Line Items]
Cash due from Correspondent institutions	538
Synovus Bank
Concentration Risk [Line Items]
Cash due from Correspondent institutions	291	1,062
Federal Home Loan Bank of Cincinnati
Concentration Risk [Line Items]
Cash due from Correspondent institutions	$ 1,489	$ 11,409

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost of Securities and Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	$ 548,898	$ 588,459
Gross unrealized gains	3,067	3,943
Gross unrealized losses	(7,973)	(10,219)
Available-for-sale securities, at fair value	543,992	582,183
Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	541,028	579,715
Gross unrealized gains	3,066	3,942
Gross unrealized losses	(7,824)	(10,084)
Available-for-sale securities, at fair value	536,270	573,573
Debt Securities | U.S. Government Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	999	998
Gross unrealized losses	(13)	(13)
Available-for-sale securities, at fair value	986	985
Debt Securities | Mortgage-backed Securities - Residential
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	425,557	450,874
Gross unrealized gains	374	939
Gross unrealized losses	(7,150)	(7,905)
Available-for-sale securities, at fair value	418,781	443,908
Debt Securities | Municipals, Tax Exempt
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	107,127	116,034
Gross unrealized gains	2,692	3,003
Gross unrealized losses	(568)	(2,114)
Available-for-sale securities, at fair value	109,251	116,923
Debt Securities | Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	7,345	11,809
Gross unrealized losses	(93)	(52)
Available-for-sale securities, at fair value	7,252	11,757
Equity Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	7,870	8,744
Gross unrealized gains	1	1
Gross unrealized losses	(149)	(135)
Available-for-sale securities, at fair value	$ 7,722	$ 8,610

Investment Securities - Additio

Investment Securities - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)security	Dec. 31, 2016USD ($)security
Investments Debt And Equity Securities [Abstract]
Securities pledged, carrying amount	$ 337,604	$ 390,814
Recognized gains on early call of available-for-sale securities	$ 1
Number of securities in securities portfolio | security	294	329
Number of securities in securities portfolio, unrealized loss position | security	124	151
Other-than-temporary impairment recorded by the company	$ 945	$ 0

Investment Securities - Schedul

Investment Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Amortized cost, Due in one year or less	$ 905	$ 9,290
Amortized cost, Due in one to five years	28,332	25,520
Amortized cost, Due in five to ten years	19,218	31,122
Amortized cost, Due in over ten years	67,016	62,909
Amortized cost, Total	115,471	128,841
Total debt securities, Amortized cost	541,028	579,715
Fair value, Due in one year or less	925	9,352
Fair value, Due in one to five years	28,878	26,340
Fair value, Due in five to ten years	19,588	32,248
Fair value, Due in over ten years	68,098	61,725
Fair value, Total	117,489	129,665
Total debt securities, Fair value	536,270	573,573
Mortgage-backed Securities - Residential
Schedule Of Available For Sale Securities [Line Items]
Total debt securities, Amortized cost	425,557	450,874
Total debt securities, Fair value	$ 418,781	$ 443,908

Investment Securities - Summa70

Investment Securities - Summary of Sales of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Available For Sale Securities Gross Realized Gain Loss [Abstract]
Proceeds from sales	$ 94,743	$ 271,148	$ 194,611
Gross realized gains	1,277	4,755
Gross realized losses	48	$ 348
Other-than-temporary-impairment	$ 945

Investment Securities - Sched71

Investment Securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Fair Value, Less than 12 months	$ 122,217	$ 444,968
Unrealized Loss, Less than 12 months	1,174	9,409
Fair Value, 12 months or more	314,406	22,199
Unrealized Loss, 12 months or more	6,799	810
Fair Value, Total	436,623	467,167
Unrealized Losses, Total	7,973	10,219
Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value, Less than 12 months	122,217	444,968
Unrealized Loss, Less than 12 months	1,174	9,409
Fair Value, 12 months or more	311,356	19,073
Unrealized Loss, 12 months or more	6,650	675
Fair Value, Total	433,573	464,041
Unrealized Losses, Total	7,824	10,084
Debt Securities | U.S. Government Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value, Less than 12 months		985
Unrealized Loss, Less than 12 months		13
Fair Value, 12 months or more	986
Unrealized Loss, 12 months or more	13
Fair Value, Total	986	985
Unrealized Losses, Total	13	13
Debt Securities | Mortgage-backed Securities - Residential
Schedule Of Available For Sale Securities [Line Items]
Fair Value, Less than 12 months	107,611	390,595
Unrealized Loss, Less than 12 months	980	7,230
Fair Value, 12 months or more	290,258	19,073
Unrealized Loss, 12 months or more	6,170	675
Fair Value, Total	397,869	409,668
Unrealized Losses, Total	7,150	7,905
Debt Securities | Municipals, Tax Exempt
Schedule Of Available For Sale Securities [Line Items]
Fair Value, Less than 12 months	7,354	43,132
Unrealized Loss, Less than 12 months	101	2,114
Fair Value, 12 months or more	20,112
Unrealized Loss, 12 months or more	467
Fair Value, Total	27,466	43,132
Unrealized Losses, Total	568	2,114
Debt Securities | Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value, Less than 12 months	7,252	10,256
Unrealized Loss, Less than 12 months	93	52
Fair Value, Total	7,252	10,256
Unrealized Losses, Total	93	52
Equity Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value, 12 months or more	3,050	3,126
Unrealized Loss, 12 months or more	149	135
Fair Value, Total	3,050	3,126
Unrealized Losses, Total	$ 149	$ 135

Investment Securities - Sched72

Investment Securities - Schedule of Other Than Temporary Impairment, Credit Losses Recognized In Earnings (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Investments Debt And Equity Securities [Abstract]
Additions related to credit losses for which OTTI was not previously recognized	$ (945)
Balance as of December 31, 2017	$ (945)

Loans and Allowance for Loan 73

Loans and Allowance for Loan Losses - Loans Outstanding by Major Lending Classification (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	$ 3,166,911	$ 1,848,784
Less: Allowance for loan losses	(24,041)	(21,747)	$ (24,460)	$ (29,030)
Net loans	3,142,870	1,827,037
Commercial and Industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	715,075	386,233
Less: Allowance for loan losses	(4,461)	(5,309)	(5,135)	(6,600)
Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	448,326	245,905
Less: Allowance for loan losses	(7,135)	(4,940)	(5,143)	(3,721)
Residential Real Estate | 1-to-4 Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	480,989	294,924
Less: Allowance for loan losses	(3,197)	(3,197)	(4,176)	(6,364)
Residential Real Estate | Residential Line of Credit
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	194,986	177,190
Less: Allowance for loan losses	(944)	(1,613)	(2,201)	(2,790)
Residential Real Estate | Multi-Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	62,374	44,977
Less: Allowance for loan losses	(434)	(504)	(311)	(184)
Commercial Real Estate | Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	495,872	357,346
Less: Allowance for loan losses	(3,558)	(3,302)	(3,682)	(6,075)
Commercial Real Estate | Non-Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	551,588	267,902
Less: Allowance for loan losses	(2,817)	(2,019)	(2,622)	(2,641)
Consumer and Other
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	217,701	74,307
Less: Allowance for loan losses	$ (1,495)	$ (863)	$ (1,190)	$ (655)

Loans and Allowance for Loan 74

Loans and Allowance for Loan Losses - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable Recorded Investment Past Due [Line Items]
Carrying value of PCI loans	$ 88,835,000	$ 16,058,000	$ 21,375,000
Non-accrual loans	3,205,000	4,265,000
Accretion of interest income	5,419,000	3,538,000	493,000
Recorded investment in troubled debt restructurings	8,604,000	8,802,000
Allocation to specific reserves	172,000	402,000
Commitments to lend additional amounts to customers	2,000	1,000
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	88,835,000	16,058,000
Non-accrual loans	0	0
Accretion of interest income	5,299,000	2,631,000	454,000
Total purchase accounting contribution through accretion for purchased loans	5,419,000	3,538,000	$ 493,000
Federal Reserve | Borrower in Custody Program
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	724,312,000	1,072,118,000
Federal Home Loan Bank of Cincinnati
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	$ 968,567,000	$ 565,717,000

Loans and Allowance for Loan 75

Loans and Allowance for Loan Losses - Changes in Value of Accretable Yield for PCI Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Purchased Credit Impaired Accretable yield, Accretion	$ 5,419	$ 3,538	$ 493
Purchased Credit Impaired
Accounts Notes And Loans Receivable [Line Items]
Purchased Credit Impaired Accretable yield, Beginning balance	(2,444)	(1,637)
Purchased Credit Impaired Accretable yield, Additions through the acquisition of the Clayton Banks	(18,868)		(1,991)
Purchased Credit Impaired Accretable Yield, Principal reductions and other reclassifications from nonaccretable difference	(1,841)	(3,438)	(100)
Purchased Credit Impaired Accretable yield, Recoveries	(23)
Purchased Credit Impaired Accretable yield, Accretion	5,299	2,631	454
Purchased Credit Impaired Accretable yield, Other changes	195
Purchased Credit Impaired Accretable yield, Ending balance	$ (17,682)	$ (2,444)	$ (1,637)

Loans and Allowance for Loan 76

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 21,747	$ 24,460	$ 29,030
Provision for loan losses	(950)	(1,479)	(3,064)
Recoveries of loans previously charged-off	5,771	1,616	2,838
Loans charged off	(2,527)	(2,850)	(4,344)
Ending balance	24,041	21,747	24,460
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	5,309	5,135	6,600
Provision for loan losses	(2,158)	212	(624)
Recoveries of loans previously charged-off	1,894	524	112
Loans charged off	(584)	(562)	(953)
Ending balance	4,461	5,309	5,135
Construction
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	4,940	5,143	3,721
Provision for loan losses	1,138	(417)	149
Recoveries of loans previously charged-off	1,084	216	1,354
Loans charged off	(27)	(2)	(81)
Ending balance	7,135	4,940	5,143
Residential Real Estate | 1-to-4 Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	3,197	4,176	6,364
Provision for loan losses	41	(882)	(1,521)
Recoveries of loans previously charged-off	159	127	161
Loans charged off	(200)	(224)	(828)
Ending balance	3,197	3,197	4,176
Residential Real Estate | Residential Line of Credit
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	1,613	2,201	2,790
Provision for loan losses	(788)	(630)	(645)
Recoveries of loans previously charged-off	395	174	286
Loans charged off	(276)	(132)	(230)
Ending balance	944	1,613	2,201
Residential Real Estate | Multi-Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	504	311	184
Provision for loan losses	(70)	193	127
Ending balance	434	504	311
Commercial Real Estate | Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	3,302	3,682	6,075
Provision for loan losses	483	(271)	(1,366)
Recoveries of loans previously charged-off	61	140	35
Loans charged off	(288)	(249)	(1,062)
Ending balance	3,558	3,302	3,682
Commercial Real Estate | Non-Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	2,019	2,622	2,641
Provision for loan losses	(848)	(271)	(307)
Recoveries of loans previously charged-off	1,646	195	342
Loans charged off		(527)	(54)
Ending balance	2,817	2,019	2,622
Consumer and Other
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	863	1,190	655
Provision for loan losses	1,252	587	1,123
Recoveries of loans previously charged-off	532	240	548
Loans charged off	(1,152)	(1,154)	(1,136)
Ending balance	$ 1,495	$ 863	$ 1,190

Loans and Allowance for Loan 77

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, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	$ 191	$ 513	$ 973
Collectively evaluated for impairment	23,850	21,234	23,487
Ending balance	24,041	21,747	24,460	$ 29,030
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	20	135	89
Collectively evaluated for impairment	4,441	5,174	5,046
Ending balance	4,461	5,309	5,135	6,600
Construction
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment			5
Collectively evaluated for impairment	7,135	4,940	5,138
Ending balance	7,135	4,940	5,143	3,721
Residential Real Estate | 1-to-4 Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	18	23	66
Collectively evaluated for impairment	3,179	3,174	4,110
Ending balance	3,197	3,197	4,176	6,364
Residential Real Estate | Residential Line of Credit
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	944	1,613	2,201
Ending balance	944	1,613	2,201	2,790
Residential Real Estate | Multi-Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	434	504	311
Ending balance	434	504	311	184
Commercial Real Estate | Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	120	113	74
Collectively evaluated for impairment	3,438	3,189	3,608
Ending balance	3,558	3,302	3,682	6,075
Commercial Real Estate | Non-Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	33	242	739
Collectively evaluated for impairment	2,784	1,777	1,883
Ending balance	2,817	2,019	2,622	2,641
Consumer and Other
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	1,495	863	1,190
Ending balance	$ 1,495	$ 863	$ 1,190	$ 655

Loans and Allowance for Loan 78

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	$ 9,373	$ 12,951	$ 15,576
Collectively evaluated for impairment	3,068,703	1,819,775	1,664,912
Acquired with deteriorated credit quality	88,835	16,058	21,375
Gross loans	3,166,911	1,848,784	1,701,863
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,579	1,476	1,499
Collectively evaluated for impairment	711,352	384,279	316,418
Acquired with deteriorated credit quality	2,144	478	874
Gross loans	715,075	386,233	318,791
Construction
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,289	2,686	2,866
Collectively evaluated for impairment	439,309	238,900	228,445
Acquired with deteriorated credit quality	7,728	4,319	6,859
Gross loans	448,326	245,905	238,170
Residential Real Estate | 1-to-4 Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,262	2,471	3,686
Collectively evaluated for impairment	456,229	290,346	284,190
Acquired with deteriorated credit quality	23,498	2,107	2,828
Gross loans	480,989	294,924	290,704
Residential Real Estate | Residential Line of Credit
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment		311
Collectively evaluated for impairment	194,986	176,879	171,526
Gross loans	194,986	177,190	171,526
Residential Real Estate | Multi-Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	978	1,027	1,074
Collectively evaluated for impairment	61,376	43,922	58,400
Acquired with deteriorated credit quality	20	28	36
Gross loans	62,374	44,977	59,510
Commercial Real Estate | Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,520	2,752	3,000
Collectively evaluated for impairment	481,390	350,812	329,569
Acquired with deteriorated credit quality	11,962	3,782	5,095
Gross loans	495,872	357,346	337,664
Commercial Real Estate | Non-Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,720	2,201	3,451
Collectively evaluated for impairment	531,704	260,361	198,741
Acquired with deteriorated credit quality	18,164	5,340	5,679
Gross loans	551,588	267,902	207,871
Consumer and Other
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	25	27
Collectively evaluated for impairment	192,357	74,276	77,623
Acquired with deteriorated credit quality	25,319	4	4
Gross loans	$ 217,701	$ 74,307	$ 77,627

Loans and Allowance for Loan 79

Loans and Allowance for Loan Losses - Credit Quality Indicators by Portfolio Class (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	$ 3,078,076	$ 1,832,726
Purchased credit impaired loans	88,835	16,058	$ 21,375
Total loans	3,166,911	1,848,784	1,701,863
Pass
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	2,940,174	1,744,392
Total loans	2,940,174	1,744,392
Watch
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	114,401	65,807
Purchased credit impaired loans	56,848
Total loans	171,249	65,807
Substandard
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	23,501	22,527
Purchased credit impaired loans	31,987	16,058
Total loans	55,488	38,585
Commercial and Industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	712,931	385,755
Purchased credit impaired loans	2,144	478	874
Total loans	715,075	386,233	318,791
Commercial and Industrial | Pass
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	657,595	351,046
Commercial and Industrial | Watch
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	50,946	31,074
Purchased credit impaired loans	1,499
Commercial and Industrial | Substandard
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	4,390	3,635
Purchased credit impaired loans	645	478
Construction
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	440,598	241,586
Purchased credit impaired loans	7,728	4,319	6,859
Total loans	448,326	245,905	238,170
Construction | Pass
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	431,242	236,588
Construction | Watch
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	7,388	4,612
Purchased credit impaired loans	3,324
Construction | Substandard
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	1,968	386
Purchased credit impaired loans	4,404	4,319
Residential Real Estate | 1-to-4 Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	457,491	292,817
Purchased credit impaired loans	23,498	2,107	2,828
Total loans	480,989	294,924	290,704
Residential Real Estate | Residential Line of Credit
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	194,986	177,190
Total loans	194,986	177,190	171,526
Residential Real Estate | Multi-Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	62,354	44,949
Purchased credit impaired loans	20	28	36
Total loans	62,374	44,977	59,510
Residential Real Estate | Pass | 1-to-4 Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	440,202	277,948
Residential Real Estate | Pass | Residential Line of Credit
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	192,427	173,011
Residential Real Estate | Pass | Multi-Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	61,234	43,770
Residential Real Estate | Watch | 1-to-4 Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	9,522	6,945
Purchased credit impaired loans	20,284
Residential Real Estate | Watch | Residential Line of Credit
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	1,184	1,875
Residential Real Estate | Watch | Multi-Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	142	152
Residential Real Estate | Substandard | 1-to-4 Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	7,767	7,924
Purchased credit impaired loans	3,214	2,107
Residential Real Estate | Substandard | Residential Line of Credit
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	1,375	2,304
Residential Real Estate | Substandard | Multi-Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	978	1,027
Purchased credit impaired loans	20	28
Commercial Real Estate | Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	483,910	353,564
Purchased credit impaired loans	11,962	3,782	5,095
Total loans	495,872	357,346	337,664
Commercial Real Estate | Non-Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	533,424	262,562
Purchased credit impaired loans	18,164	5,340	5,679
Total loans	551,588	267,902	207,871
Commercial Real Estate | Pass | Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	451,140	338,698
Commercial Real Estate | Pass | Non-Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	517,253	249,877
Commercial Real Estate | Watch | Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	28,308	10,459
Purchased credit impaired loans	4,631
Commercial Real Estate | Watch | Non-Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	14,199	10,273
Purchased credit impaired loans	7,359
Commercial Real Estate | Substandard | Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	4,462	4,407
Purchased credit impaired loans	7,331	3,782
Commercial Real Estate | Substandard | Non-Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	1,972	2,412
Purchased credit impaired loans	10,805	5,340
Consumer and Other
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	192,382	74,303
Purchased credit impaired loans	25,319	4	4
Total loans	217,701	74,307	$ 77,627
Consumer and Other | Pass
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	189,081	73,454
Consumer and Other | Watch
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	2,712	417
Purchased credit impaired loans	19,751
Consumer and Other | Substandard
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	589	432
Purchased credit impaired loans	$ 5,568	$ 4

Loans and Allowance for Loan 80

Loans and Allowance for Loan Losses - Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	$ 3,166,911	$ 1,848,784
Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	88,835	16,058
Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	8,101	8,729
30-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	15,063	5,749
90 Days or More and Accruing Interest
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	1,996	1,329
Financing Receivables Current
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	3,052,916	1,816,919
Commercial and Industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	715,075	386,233
Commercial and Industrial | Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	2,144	478
Commercial and Industrial | Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	533	1,297
Commercial and Industrial | 30-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	5,859	262
Commercial and Industrial | 90 Days or More and Accruing Interest
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	90	127
Commercial and Industrial | Financing Receivables Current
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	706,449	384,069
Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	448,326	245,905
Construction | Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	7,728	4,319
Construction | Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	300	254
Construction | 30-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	1,412	441
Construction | 90 Days or More and Accruing Interest
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	241	17
Construction | Financing Receivables Current
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	438,645	240,874
Residential Real Estate | 1-to-4 Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	480,989	294,924
Residential Real Estate | 1-to-4 Family Mortgage | Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	23,498	2,107
Residential Real Estate | 1-to-4 Family Mortgage | Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	2,548	2,289
Residential Real Estate | Residential Line of Credit
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	194,986	177,190
Residential Real Estate | Residential Line of Credit | Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	699	601
Residential Real Estate | Multi-Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	62,374	44,977
Residential Real Estate | Multi-Family Mortgage | Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	20	28
Residential Real Estate | 30-89 Days Past Due | 1-to-4 Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	4,678	3,130
Residential Real Estate | 30-89 Days Past Due | Residential Line of Credit
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	527	1,139
Residential Real Estate | 90 Days or More and Accruing Interest | 1-to-4 Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	956	697
Residential Real Estate | 90 Days or More and Accruing Interest | Residential Line of Credit
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	134	433
Residential Real Estate | Financing Receivables Current | 1-to-4 Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	449,309	286,701
Residential Real Estate | Financing Receivables Current | Residential Line of Credit
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	193,626	175,017
Residential Real Estate | Financing Receivables Current | Multi-Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	62,354	44,949
Commercial Real Estate | Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	495,872	357,346
Commercial Real Estate | Owner Occupied | Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	11,962	3,782
Commercial Real Estate | Owner Occupied | Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	2,582	2,007
Commercial Real Estate | Non-Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	551,588	267,902
Commercial Real Estate | Non-Owner Occupied | Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	18,164	5,340
Commercial Real Estate | Non-Owner Occupied | Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	1,371	2,251
Commercial Real Estate | 30-89 Days Past Due | Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	521	186
Commercial Real Estate | 30-89 Days Past Due | Non-Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	121	158
Commercial Real Estate | 90 Days or More and Accruing Interest | Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	358
Commercial Real Estate | Financing Receivables Current | Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	480,449	351,371
Commercial Real Estate | Financing Receivables Current | Non-Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	531,932	260,153
Consumer and Other
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	217,701	74,307
Consumer and Other | Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	25,319	4
Consumer and Other | Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	68	30
Consumer and Other | 30-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	1,945	433
Consumer and Other | 90 Days or More and Accruing Interest
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	217	55
Consumer and Other | Financing Receivables Current
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	$ 190,152	$ 73,785

Loans and Allowance for Loan 81

Loans and Allowance for Loan Losses - Impaired Loans Recognized, Segregated by Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable Impaired [Line Items]
Impaired loans with related allowance, Recorded investment	$ 1,235	$ 2,744
Impaired loans with related allowance, Unpaid principal	1,821	3,556
Impaired loans with related allowance, Related allowance	191	513
Impaired loan with no related allowance, Recorded investment	8,138	10,207
Impaired loan with no related allowance, Unpaid principal	9,451	12,170
Total impaired loans, Recorded investment	9,373	12,951
Total impaired loans, Unpaid principal	11,272	15,726
Total impaired loans, Related allowance	191	513
Impaired loan with no related allowance, Average recorded investment	9,173	7,835	$ 10,107
Impaired loan with no related allowance, Interest income recognized (cash basis)	335	455	159
Impaired loans with related allowance, Average recorded investment	1,992	6,432	9,576
Impaired loans with related allowance, Interest income recognized (cash basis)	64	43	319
Total impaired loans, Average recorded investment	11,164	14,267	19,683
Total impaired loans, Interest income recognized (cash basis)	399	498	478
Commercial and Industrial
Financing Receivable Impaired [Line Items]
Impaired loans with related allowance, Recorded investment	53	854
Impaired loans with related allowance, Unpaid principal	53	854
Impaired loans with related allowance, Related allowance	20	135
Impaired loan with no related allowance, Recorded investment	1,526	622
Impaired loan with no related allowance, Unpaid principal	1,570	746
Impaired loan with no related allowance, Average recorded investment	1,074	494	660
Impaired loan with no related allowance, Interest income recognized (cash basis)	38	20
Impaired loans with related allowance, Average recorded investment	454	994	1,269
Impaired loans with related allowance, Interest income recognized (cash basis)	2	17	22
Construction
Financing Receivable Impaired [Line Items]
Impaired loan with no related allowance, Recorded investment	1,289	2,686
Impaired loan with no related allowance, Unpaid principal	1,313	2,694
Impaired loan with no related allowance, Average recorded investment	1,988	2,622	4,337
Impaired loan with no related allowance, Interest income recognized (cash basis)	46	132	127
Impaired loans with related allowance, Average recorded investment		154	517
Impaired loans with related allowance, Interest income recognized (cash basis)			3
Residential Real Estate | 1-to-4 Family Mortgage
Financing Receivable Impaired [Line Items]
Impaired loans with related allowance, Recorded investment	194	103
Impaired loans with related allowance, Unpaid principal	495	369
Impaired loans with related allowance, Related allowance	18	23
Impaired loan with no related allowance, Recorded investment	1,068	2,368
Impaired loan with no related allowance, Unpaid principal	1,072	2,370
Impaired loan with no related allowance, Average recorded investment	1,718	1,329	2,815
Impaired loan with no related allowance, Interest income recognized (cash basis)	63	137	7
Impaired loans with related allowance, Average recorded investment	149	1,750	2,345
Impaired loans with related allowance, Interest income recognized (cash basis)	9	1	199
Residential Real Estate | Residential Line of Credit
Financing Receivable Impaired [Line Items]
Impaired loan with no related allowance, Recorded investment		311
Impaired loan with no related allowance, Unpaid principal		321
Impaired loan with no related allowance, Average recorded investment	156	156
Impaired loan with no related allowance, Interest income recognized (cash basis)		10
Residential Real Estate | Multi-Family Mortgage
Financing Receivable Impaired [Line Items]
Impaired loan with no related allowance, Recorded investment	978	1,027
Impaired loan with no related allowance, Unpaid principal	978	1,027
Impaired loan with no related allowance, Average recorded investment	1,003	1,051	652
Impaired loan with no related allowance, Interest income recognized (cash basis)	46	37	25
Impaired loans with related allowance, Average recorded investment			468
Commercial Real Estate | Owner Occupied
Financing Receivable Impaired [Line Items]
Impaired loans with related allowance, Recorded investment	844	635
Impaired loans with related allowance, Unpaid principal	1,123	654
Impaired loans with related allowance, Related allowance	120	113
Impaired loan with no related allowance, Recorded investment	1,676	2,117
Impaired loan with no related allowance, Unpaid principal	2,168	3,205
Impaired loan with no related allowance, Average recorded investment	1,897	1,120	788
Impaired loan with no related allowance, Interest income recognized (cash basis)	122	119
Impaired loans with related allowance, Average recorded investment	740	1,756	1,938
Impaired loans with related allowance, Interest income recognized (cash basis)	48	25	95
Commercial Real Estate | Non-Owner Occupied
Financing Receivable Impaired [Line Items]
Impaired loans with related allowance, Recorded investment	144	1,151
Impaired loans with related allowance, Unpaid principal	150	1,678
Impaired loans with related allowance, Related allowance	33	242
Impaired loan with no related allowance, Recorded investment	1,576	1,050
Impaired loan with no related allowance, Unpaid principal	2,325	1,781
Impaired loan with no related allowance, Average recorded investment	1,313	1,050	855
Impaired loan with no related allowance, Interest income recognized (cash basis)	19
Impaired loans with related allowance, Average recorded investment	648	1,777	$ 3,039
Impaired loans with related allowance, Interest income recognized (cash basis)	5
Consumer and Other
Financing Receivable Impaired [Line Items]
Impaired loans with related allowance, Recorded investment		1
Impaired loans with related allowance, Unpaid principal		1
Impaired loan with no related allowance, Recorded investment	25	26
Impaired loan with no related allowance, Unpaid principal	25	26
Impaired loan with no related allowance, Average recorded investment	26	13
Impaired loan with no related allowance, Interest income recognized (cash basis)	1
Impaired loans with related allowance, Average recorded investment	$ 1	$ 1

Loans and Allowance for Loan 82

Loans and Allowance for Loan Losses - Financial Effect of TDRs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)loan	Dec. 31, 2016USD ($)loan	Dec. 31, 2015USD ($)loan
Financing Receivable Modifications [Line Items]
Number of loans | loan	7	9	16
Pre-modification outstanding recorded investment	$ 1,883	$ 1,966	$ 3,546
Post-modification outstanding recorded investment	1,883	$ 1,966	3,546
Charge offs and specific reserves	$ 76		$ 132
Consumer and Other
Financing Receivable Modifications [Line Items]
Number of loans | loan	1	3
Pre-modification outstanding recorded investment	$ 25	$ 29
Post-modification outstanding recorded investment	$ 25	$ 29
Commercial and Industrial
Financing Receivable Modifications [Line Items]
Number of loans | loan	2		6
Pre-modification outstanding recorded investment	$ 627		$ 2,301
Post-modification outstanding recorded investment	$ 627		2,301
Charge offs and specific reserves			$ 86
Commercial Real Estate | Owner Occupied
Financing Receivable Modifications [Line Items]
Number of loans | loan	1	1	4
Pre-modification outstanding recorded investment	$ 377	$ 118	$ 786
Post-modification outstanding recorded investment	$ 377	$ 118	$ 786
Commercial Real Estate | Non-Owner Occupied
Financing Receivable Modifications [Line Items]
Number of loans | loan	2		1
Pre-modification outstanding recorded investment	$ 711		$ 133
Post-modification outstanding recorded investment	711		133
Charge offs and specific reserves	$ 68		1
Residential Real Estate
Financing Receivable Modifications [Line Items]
Charge offs and specific reserves			$ 45
Residential Real Estate | 1-to-4 Family Mortgage
Financing Receivable Modifications [Line Items]
Number of loans | loan	1	5	5
Pre-modification outstanding recorded investment	$ 143	$ 1,819	$ 326
Post-modification outstanding recorded investment	143	$ 1,819	326
Charge offs and specific reserves	$ 8		$ 45

Loans and Allowance for Loan 83

Loans and Allowance for Loan Losses - Summary of Loans Modified as Troubled Debt Restructurings for Payment Default (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Troubled Debt Restructurings [Line Items]
Defaulted	$ 0	$ 0
Charge offs and specific reserves	76,000		$ 132,000
Residential Real Estate
Troubled Debt Restructurings [Line Items]
Defaulted			145,000
Charge offs and specific reserves			45,000
Residential Real Estate | 1-to-4 Family Mortgage
Troubled Debt Restructurings [Line Items]
Defaulted			145,000
Charge offs and specific reserves	$ 8,000		$ 45,000

Premises and Equipment - Schedu

Premises and Equipment - Schedule of Premises and Equipment and Related Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Premises and equipment, gross	$ 126,880	$ 107,664
Less: accumulated depreciation	(45,303)	(41,013)
Total Premises and Equipment	81,577	66,651
Land
Property Plant And Equipment [Line Items]
Premises and equipment, gross	22,108	18,698
Premises
Property Plant And Equipment [Line Items]
Premises and equipment, gross	57,719	44,301
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Premises and equipment, gross	22,292	21,700
Leasehold Improvements
Property Plant And Equipment [Line Items]
Premises and equipment, gross	10,740	10,515
Equipment
Property Plant And Equipment [Line Items]
Premises and equipment, gross	12,525	11,583
Construction In Process
Property Plant And Equipment [Line Items]
Premises and equipment, gross	$ 1,496	$ 867

Premises and Equipment - Additi

Premises and Equipment - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Depreciation expense	$ 4,316	$ 3,995	$ 3,283

Other Real Estate Owned - Summa

Other Real Estate Owned - Summary of Other Real Estate Owned (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Real Estate [Abstract]
Balance at beginning of period		$ 7,403	$ 11,641	$ 7,259
Transfers from loans		3,605	2,724	4,085
Transfers from premises and equipment	$ 3,466	3,466
Capital improvements				171
Acquired through merger or acquisition		6,888		5,002
Properties sold		(5,438)	(6,696)	(3,774)
Gain on sale of other real estate owned		1,080	1,670	187
Transferred to loans		(256)	(1,548)	(785)
Write-downs and partial liquidations		(306)	(388)	(504)
Balance at end of period	$ 16,442	$ 16,442	$ 7,403	$ 11,641

Other Real Estate Owned - Addit

Other Real Estate Owned - Additional Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017USD ($)Branch	Dec. 31, 2017USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2016USD ($)
Real Estate Properties [Line Items]
Real estate acquired through merger		$ 6,888	$ 5,002
Number of branch locations consolidated as part of merger or acquisition | Branch	5
Excess land and facilities transferred	$ 3,466	3,466
Clayton Banks
Real Estate Properties [Line Items]
Real estate acquired through merger		6,888
Acquisition of excess land and facilities held for sale as part of merger		4,147
Residential Real Estate Properties
Real Estate Properties [Line Items]
Foreclosed residential real estate properties	3,631	3,631		$ 2,143
Total foreclosure proceedings in process	$ 19	$ 19		$ 96

Goodwill and Intangible Asset88

Goodwill and Intangible Assets - Summary of Changes in Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Goodwill [Line Items]
Balance at December 31, 2016	$ 46,867
Balance at December 31, 2017	137,190
Clayton Banks
Goodwill [Line Items]
Addition from merger with Clayton Banks (see Note 2)	$ 90,323

Goodwill and Intangible Asset89

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Core deposit intangible asset	$ 587
Intangible asset amortized over estimated useful life		6 years 6 months	10 years	5 years
Customer Base Trust Intangible
Finite Lived Intangible Assets [Line Items]
Core deposit intangible asset	1,600
Manufactured Housing Servicing Intangible
Finite Lived Intangible Assets [Line Items]
Core deposit intangible asset	1,088
Clayton Banks | Core Deposits
Finite Lived Intangible Assets [Line Items]
Core deposit intangible asset	$ 9,060
Estimated useful life of intangible assets	3 years

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets - Schedule of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Net Carrying Amount	$ 14,902	$ 4,563
Core Deposits
Finite Lived Intangible Assets [Line Items]
Net Carrying Amount	14,902
Clayton Banks
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	42,190
Accumulated Amortization	(27,288)
Net Carrying Amount	14,902
Clayton Banks | Core Deposits
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	38,915	29,855	$ 29,855
Accumulated Amortization	(27,121)	(25,292)	(23,160)
Net Carrying Amount	11,794	$ 4,563	$ 6,695
Clayton Banks | Leasehold Intangible
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	587
Accumulated Amortization	(38)
Net Carrying Amount	549
Clayton Banks | Customer Base Trust Intangible
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,600
Accumulated Amortization	(67)
Net Carrying Amount	1,533
Clayton Banks | Manufactured Housing Servicing Intangible
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,088
Accumulated Amortization	(62)
Net Carrying Amount	$ 1,026

Goodwill and Other Intangible91

Goodwill and Other Intangible Assets - Schedule of Estimated Aggregate Amortization Expense of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Net Carrying Amount	$ 14,902	$ 4,563
Core Deposits
Finite Lived Intangible Assets [Line Items]
December 31, 2018	3,275
December 31, 2019	2,866
December 31, 2020	2,476
December 31, 2021	2,090
December 31, 2022	1,609
Thereafter	2,586
Net Carrying Amount	$ 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, 2017	Dec. 31, 2016	Dec. 31, 2015
Transfers And Servicing [Abstract]
Carrying value prior to policy change	$ 32,070	$ 29,711	$ 6,032
Fair value impact of change in accounting policy (See Note 1)	1,011
Carrying value at beginning of period	33,081	29,711	6,032
Capitalization	58,984	46,070	26,474
Amortization		(8,321)	(2,601)
Sales	(11,686)	(34,118)
(Loss) gain on sale	(249)	3,406
Impairment		(4,678)	(194)
Change in fair value:
Due to pay-offs/pay-downs	(3,104)
Due to change in valuation inputs or assumptions	(919)
Carrying value at December 31	$ 76,107	$ 32,070	$ 29,711

Mortgage Servicing Rights - S93

Mortgage Servicing Rights - Schedule of Servicing Income and Expense Included in Mortgage Banking Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Servicing income:
Servicing income	$ 13,168	$ 12,063	$ 3,614
Change in fair value of mortgage servicing rights	(4,023)
Change in fair value of derivative hedging instruments	599
Total servicing income	9,744	12,063	3,614
Servicing expenses:
Servicing asset amortization		8,321	2,601
Servicing asset impairment		4,678	194
Loss on sale of mortgage servicing rights and related hedges and transaction costs on sale	249	4,447
Other servicing expenses	4,896	2,325	633
Total servicing expenses	5,145	19,771	3,428
Net servicing income (loss)	$ 4,599	$ (7,708)	$ 186

Mortgage Servicing Rights - S94

Mortgage Servicing Rights - Schedule of Data and Key Economic Assumptions Related to Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Transfers And Servicing [Abstract]
Unpaid principal balance	$ 6,529,431	$ 2,833,958
Weighted-average prepayment speed (CPR)	8.90%	8.40%
Estimated impact on fair value of a 10% increase	$ (3,026)	$ (1,256)
Estimated impact on fair value of a 20% increase	$ (5,855)	$ (2,434)
Discount rate	9.75%	9.54%
Estimated impact on fair value of a 100 bp increase	$ (3,052)	$ (1,394)
Estimated impact on fair value of a 200 bp increase	$ (5,867)	$ (2,679)
Weighted-average coupon interest rate	3.94%	3.59%
Weighted-average servicing fee (basis points)	0.28%	0.27%
Weighted-average remaining maturity (in months)	335 months	328 months

Mortgage Servicing Rights - Add

Mortgage Servicing Rights - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Transfers And Servicing [Abstract]
Mortgage servicing rights sold	$ 11,686,000	$ 34,118,000
Mortgage loans serviced	1,086,465,000	3,370,395,000
Mortgage loans serviced related to bulk sale of mortgage servicing rights	$ 0	$ 3,332,903,000

Other Assets and Other liabil96

Other Assets and Other liabilities - Summary of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Assets And Other Liabilities [Abstract]
Cash surrender value on bank owned life insurance	$ 10,873	$ 10,556
Prepaid expenses	2,477	2,245
Software	1,962	2,296
Mortgage lending receivable	3,176	24
Derivatives	9,690	19,745
Other assets	16,038	16,488
Total other assets	$ 44,216	$ 51,354

Other Assets and Other liabil97

Other Assets and Other liabilities - Summary of Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Assets And Other Liabilities [Abstract]
Deferred compensation	$ 5,301	$ 6,710
Accrued payroll	11,018	5,987
Mortgage servicing escrows	3,341	1,079
Mortgage buyback reserve	3,386	2,659
Accrued interest	1,504	632
Derivatives	1,699	586
Deferred tax liability (See Note 15)	11,858	4,180
Right to repurchase GNMA loans serviced (See Note 1)	43,035
Other liabilities	37,852	36,535
Total other liabilities	$ 118,994	$ 58,368

Deposits - Additional Informati

Deposits - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Time Deposits [Abstract]
Time deposits in denomination of greater than $250	$ 176,837	$ 60,124

Deposits - Schedule of Maturiti

Deposits - Schedule of Maturities of Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Time Deposits By Maturity [Abstract]
December 31, 2018	$ 432,030
December 31, 2019	139,398
December 31, 2020	56,719
December 31, 2021	32,893
December 31, 2022	24,075
Thereafter	3,214
Total time deposits	$ 688,329	$ 391,031

Securities Sold Under Agreem100

Securities Sold Under Agreements to Repurchase - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets Sold Under Agreements To Repurchase [Line Items]
Securities sold under agreement to repurchase, carrying value	$ 14,293	$ 21,561
Mortgage Backed Securities
Assets Sold Under Agreements To Repurchase [Line Items]
Securities sold under agreement to repurchase, carrying value	$ 14,293	$ 21,561

Securities Sold Under Agreem101

Securities Sold Under Agreements to Repurchase - Summary of Balances for Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Assets Sold Under Agreements To Repurchase [Line Items]
Balance at year end	$ 14,293	$ 21,561
Mortgage Backed Securities
Assets Sold Under Agreements To Repurchase [Line Items]
Balance at year end	14,293	21,561
Average daily balance during the year	$ 16,326	$ 60,331
Average interest rate during the year	0.17%	0.11%
Maximum month-end balance during the year	$ 19,432	$ 115,005
Weighted average interest rate at year-end	0.16%	0.17%

Short-term Borrowings - Additio

Short-term Borrowings - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Short Term Debt [Line Items]
Borrowings against lines	$ 190,000,000	$ 150,000,000
Federal Reserve Bank | Borrower in Custody Program
Short Term Debt [Line Items]
Line of credit	529,547,000	765,107,000
Federal Reserve Bank | Borrower in Custody Program | Qualifying Loans
Short Term Debt [Line Items]
Pledged loan securities	737,856,000	1,072,118,000
Federal Reserve Bank | Borrower in Custody Program | Investment Securities
Short Term Debt [Line Items]
Pledged loan securities	13,544,000	0
Federal Home Loan Bank
Short Term Debt [Line Items]
Borrowings against lines	190,000,000	150,000,000
Pledged investment securities	0	60,371,000
Loans from Federal Home Loan Banks	968,567,000	565,718,000
U.S. Government Agency Securities | One to Four Family and Multi-Family Mortgages | Federal Home Loan Bank
Short Term Debt [Line Items]
Line of credit	300,000,000	300,000,000
First Tennessee Bank, N.A
Short Term Debt [Line Items]
Line of credit	$ 30,000,000	30,000,000
Number of consecutive trading days	14 days
Borrowings against lines	$ 0	0
BBVA Compass Bank
Short Term Debt [Line Items]
Line of credit	$ 10,000,000	10,000,000
Number of consecutive trading days	14 days
Borrowings against lines	$ 0	0
SunTrust Bank
Short Term Debt [Line Items]
Line of credit	$ 15,000,000
Number of consecutive trading days	7 days
Borrowings against lines	$ 0	0
SunTrust Bank | Minimum
Short Term Debt [Line Items]
Marketable security with current value, percent	125.00%
First National Banker's Bank
Short Term Debt [Line Items]
Line of credit	$ 10,000,000
Number of consecutive trading days	30 days
Zions Bank
Short Term Debt [Line Items]
Line of credit	$ 25,000,000
PNC Bank
Short Term Debt [Line Items]
Line of credit	20,000,000
Servis First Bank
Short Term Debt [Line Items]
Line of credit	15,000,000
Borrowings against lines	$ 0	$ 0

Long-term Debt - Additional Inf

Long-term Debt - Additional Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)InterestRateSwap	Dec. 31, 2016USD ($)	Dec. 31, 2003USD ($)trust	Dec. 31, 2015USD ($)Note
Debt Instrument [Line Items]
Number of subordinated notes payable | Note					3
Fixed rate borrowings		$ 112,372	$ 13,962
Federal home loan bank, Advances, Branch of FHLB bank, Weighted average interest rate		1.45%	3.02%
Federal home loan bank advances maturity and reprice period		90 days
Number of corresponding interest rate swap agreements | InterestRateSwap		3
Number of separate trusts | trust				2
Net proceeds from sale of common stock		$ 153,356	$ 116,054
Debt instrument, redemption, description		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.
Floating Rate Trust Preferred Securities Trust I
Debt Instrument [Line Items]
Preferred securities issued to form the trust				$ 9,000
Debt instrument, basis spread on variable rate				3.25%
Debt instrument, description of variable rate basis		3-month LIBOR plus 3.25%
Debt instrument, interest rate		4.59%	4.25%
Floating Rate Trust Preferred Securities Trust II
Debt Instrument [Line Items]
Preferred securities issued to form the trust				$ 21,000
Debt instrument, basis spread on variable rate				3.15%
Debt instrument, description of variable rate basis		3-month LIBOR plus 3.15%
Debt instrument, interest rate		4.82%	4.15%
Clayton Banks
Debt Instrument [Line Items]
Fixed rate borrowings	$ 100,000
Minimum
Debt Instrument [Line Items]
Federal home loan bank advances maturities due term		1 year
Maximum
Debt Instrument [Line Items]
Federal home loan bank advances maturities due term		12 years
Federal Home Loan Bank of Cincinnati
Debt Instrument [Line Items]
Borrowing capacity at Federal Home Loan Bank of Cincinnati		$ 671,461	$ 476,562
Loans from Federal Home Loan Banks		968,567	565,718
Pledged investment securities		$ 0	60,371
First Note
Debt Instrument [Line Items]
Debt instrument, face amount					$ 775
Second Note
Debt Instrument [Line Items]
Debt instrument, face amount					$ 3,300
Third Note
Debt Instrument [Line Items]
Debt instrument, face amount			$ 6,000
Junior Subordinated Debentures | Floating Rate Trust Preferred Securities Trust I
Debt Instrument [Line Items]
Proceeds from Issuance of Debt				$ 9,280
Net proceeds from sale of common stock				280
Junior Subordinated Debentures | Floating Rate Trust Preferred Securities Trust II
Debt Instrument [Line Items]
Proceeds from Issuance of Debt				21,650
Net proceeds from sale of common stock				$ 650

Long-term Debt - Summary of Mat

Long-term Debt - Summary of Maturities of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Due on or before:
December 31, 2018	$ 109,712
December 31, 2019	224
December 31, 2020	131
December 31, 2021	418
December 31, 2022	890
Due thereafter	31,927
Total	143,302	$ 44,892
Federal Home Loan Bank
Due on or before:
December 31, 2018	109,712
December 31, 2019	224
December 31, 2020	131
December 31, 2021	418
December 31, 2022	890
Due thereafter	997
Total	112,372
Junior Subordinated Debentures
Due on or before:
Due thereafter	30,930
Total	$ 30,930

Long-term Debt - Summary of 105

Long-term Debt - Summary of Maturities of Long-Term Debt (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Fixed rate borrowings	$ 112,372	$ 13,962
Federal home loan bank advances maturity and reprice period	90 days
Interest Rate Swaps
Debt Instrument [Line Items]
Fixed rate borrowings	$ 100,000
Federal home loan bank advances maturity and reprice period	90 days
Fixed rate repricing terms amount maturing year on 2020	$ 30,000
Fixed rate repricing terms amount maturing year on 2021	35,000
Fixed rate repricing terms amount maturing year on 2022	$ 35,000

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Deferred tax liability increased due to change in taxable status			$ 13,181
Statutory federal income tax rate		35.00%
Reduction in deferred tax liability due to change in tax rate		$ 5,894
Deferred income tax expense related to unrealized gain on available for sale securities		6,458	9,257	$ 1,647
C Corporation
Income Taxes [Line Items]
Deferred tax liability increased due to change in taxable status			$ 13,181
Deferred income tax expense related to unrealized gain on available for sale securities		$ 2,955
Scenario, Plan
Income Taxes [Line Items]
Statutory federal income tax rate	21.00%

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Current	$ 14,629	$ 12,476	$ 1,321
Deferred	6,458	9,257	1,647
Total	$ 21,087	$ 21,733	$ 2,968

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Federal taxes calculated at statutory rate	$ 25,720	$ 5,061
Increase (decrease) resulting from:
State taxes, net of federal benefit	3,053	3,664	$ 2,956
Revaluation of net deferred tax liability as a result of the Tax Cuts and Jobs Act	(5,894)
Conversion as of September 16, 2016 to C Corporation		13,181
Benefit of equity based compensation	(310)	(786)
Permanent items	(1,402)	(633)	12
Other	(80)	1,246
Total	$ 21,087	21,733	$ 2,968
C Corporation
Increase (decrease) resulting from:
Conversion as of September 16, 2016 to C Corporation		$ 13,181

Income Taxes - Schedule of Net

Income Taxes - Schedule of Net Deferred Tax liability (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Allowance for loan losses	$ 6,264	$ 8,516
Amortization of core deposit intangible	759	996
Compensation related	6,158	7,552
Unrealized loss on securities	988	2,462
Other	3,599	2,430
Subtotal	17,768	21,956
Deferred tax liabilities:
FHLB stock dividends	(550)	(827)
Depreciation	(4,115)	(6,548)
Mortgage servicing rights	(19,830)	(12,558)
Other	(5,131)	(6,203)
Subtotal	(29,626)	(26,136)
Net deferred tax liability	$ (11,858)	$ (4,180)

Dividend Restrictions - Additio

Dividend Restrictions - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Restrictions On Dividends Loans And Advances Disclosure [Abstract]
Amount available for payment of dividend without prior approval	$ 105,453	$ 66,180
Dividends declared	$ 0	$ 69,300	$ 23,600

Commitments and Contingencies -

Commitments and Contingencies - Summary of Financial Instruments with Off-Balance Sheet Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Financial instruments with off-balance sheet credit loss	$ 1,000,158	$ 602,426
Commitments to Extend Credit, Excluding Interest Rate Lock Commitments
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Financial instruments with off-balance sheet credit loss	977,276	579,879
Letter of Credit
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Financial instruments with off-balance sheet credit loss	$ 22,882	$ 22,547

Commitments and Contingencie112

Commitments and Contingencies - Summary of Commitments Under Non-Cancelable Operating Leases (Details) $ in Thousands	Dec. 31, 2017USD ($)
Commitments And Contingencies Disclosure [Abstract]
2,018	$ 3,533
2,019	2,806
2,020	2,318
2,021	2,074
2,022	1,623
Thereafter	5,350
Total	$ 17,704

Commitments and Contingencie113

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Operating leases rent expense	$ 4,245	$ 3,904	$ 3,750
Total principal amount of loans repurchased or indemnified	$ 4,704	$ 8,326	$ 2,453

Commitments and Contingencie114

Commitments and Contingencies - Summary of Allowance for Loan Repurchases or Indemnifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 2,659	$ 2,156	$ 828
Provision for loan repurchases or indemnifications	810	512	1,375
Recoveries on previous losses		9
Losses on loans repurchased or indemnified	(83)	(18)	(47)
Balance at end of period	$ 3,386	$ 2,659	$ 2,156

Derivatives - Additional Inform

Derivatives - Additional Information (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2017USD ($)	Dec. 31, 2017USD ($)	Jun. 30, 2017USD ($)InterestRateSwap	Dec. 31, 2016USD ($)
Derivative [Line Items]
Long-term debt		$ 143,302		$ 44,892
Notional amount	$ 100,000
Interest rate swap maturity date		Jun. 30, 2024
Designated as Hedging
Derivative [Line Items]
Notional amount		$ 130,000
Subordinated Debentures
Derivative [Line Items]
Number of derivative instruments | InterestRateSwap			2
Long-term debt			$ 30,930
Interest Rate Swaps
Derivative [Line Items]
Number of derivative instruments | InterestRateSwap			3
Interest Rate Swaps | Designated as Hedging
Derivative [Line Items]
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		$ 305
Interest Rate Swaps Three
Derivative [Line Items]
Notional amount	$ 30,000
Derivative notional amount maturity period	3 years
Interest Rate Swaps Four
Derivative [Line Items]
Notional amount	$ 35,000
Derivative notional amount maturity period	4 years
Interest Rate Swaps Five
Derivative [Line Items]
Notional amount	$ 35,000
Derivative notional amount maturity period	5 years

Derivatives - Schedule of Deriv

Derivatives - Schedule of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jul. 31, 2017	Dec. 31, 2016
Derivatives Fair Value [Line Items]
Notional amount		$ 100,000
Asset	$ 9,690		$ 19,745
Liability	1,699		586
Not Designated As Hedging
Derivatives Fair Value [Line Items]
Notional amount	1,810,484		1,384,163
Asset	8,258		19,745
Liability	1,699		586
Not Designated As Hedging | Interest rate contracts
Derivatives Fair Value [Line Items]
Notional amount	146,754		22,243
Asset	1,146		586
Liability	1,146		586
Not Designated As Hedging | Forward commitments
Derivatives Fair Value [Line Items]
Notional amount	870,574		829,000
Asset			12,731
Liability	553
Not Designated As Hedging | Interest rate-lock commitments
Derivatives Fair Value [Line Items]
Notional amount	504,156		532,920
Asset	6,768		$ 6,428
Not Designated As Hedging | Option Contracts
Derivatives Fair Value [Line Items]
Notional amount	6,000
Asset	29
Not Designated As Hedging | Futures Contracts
Derivatives Fair Value [Line Items]
Notional amount	283,000
Asset	315
Designated as Hedging
Derivatives Fair Value [Line Items]
Notional amount	130,000
Asset	1,432
Designated as Hedging | Interest Rate Swaps
Derivatives Fair Value [Line Items]
Notional amount	130,000
Asset	$ 1,432

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivatives Fair Value [Line Items]
Amount of gain recognized in other comprehensive income, net of tax	$ 685
Derivatives Not Designated As Hedging Instruments | Mortgage Banking Income
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(11,310)	$ 11,332	$ (1,527)
Derivatives Not Designated As Hedging Instruments | Mortgage Banking Income | Interest Rate Lock Commitments
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	340	835	2,073
Derivatives Not Designated As Hedging Instruments | Mortgage Banking Income | Forward Contracts
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(11,987)	10,497	$ (3,600)
Derivatives Not Designated As Hedging Instruments | Mortgage Banking Income | Futures Contracts
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	315
Derivatives Not Designated As Hedging Instruments | Mortgage Banking Income | Option Contracts
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	22
Designated as Hedging
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	168	(5,569)
Amount of gain reclassified from other comprehensive income and recognized in interest expense on long-term debt	168
Amount of gain recognized in other comprehensive income, net of tax	$ 685
Designated as Hedging | Included in Loss on Sale of Mortgage Servicing Rights
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments		$ (5,569)

Fair Value Measurements - Estim

Fair Value Measurements - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financial assets:
Available-for-sale securities, at fair value	$ 543,992	$ 582,183
Interest receivable	13,069	7,241
Mortgage servicing rights, net		33,081	$ 29,711	$ 6,032
Derivatives assets	9,690	19,745
Financial liabilities:
Derivatives liabilities	1,699	586
Carrying Amount
Financial assets:
Cash and cash equivalents	119,751	136,327
Available-for-sale securities, at fair value	543,992	582,183
Federal Home Loan Bank Stock	11,412	7,743
Loans, net	3,142,870	1,827,037
Loans held for sale	526,185	507,442
Interest receivable	13,069	7,241
Mortgage servicing rights, net	76,107	32,070
Derivatives assets	9,690	19,745
Financial liabilities:
Deposits, Without stated maturities	2,976,066	2,280,531
Deposits, With stated maturities	688,329	391,031
Securities sold under agreement to repurchase	14,293	21,561
Short term borrowings	190,000	150,000
Interest payable	1,504	632
Long-term debt	143,302	44,892
Derivatives liabilities	1,699	586
Fair Value
Financial assets:
Cash and cash equivalents	119,751	136,327
Available-for-sale securities, at fair value	543,992	582,183
Federal Home Loan Bank Stock	11,412	7,743
Loans, net	3,141,400	1,823,335
Loans held for sale	526,185	507,442
Interest receivable	13,069	7,241
Mortgage servicing rights, net	76,107	33,081
Derivatives assets	9,690	19,745
Financial liabilities:
Deposits, Without stated maturities	2,976,066	2,280,531
Deposits, With stated maturities	682,403	390,484
Securities sold under agreement to repurchase	14,293	21,561
Short term borrowings	190,000	150,000
Interest payable	1,504	632
Long-term debt	149,135	47,377
Derivatives liabilities	1,699	586
Fair Value | Fair Value Level 1
Financial assets:
Cash and cash equivalents	119,751	136,327
Financial liabilities:
Deposits, Without stated maturities	2,976,066	2,280,531
Securities sold under agreement to repurchase	14,293	21,561
Short term borrowings	190,000	150,000
Interest payable	575	249
Fair Value | Fair Value Level 2
Financial assets:
Available-for-sale securities, at fair value	540,388	577,634
Loans, net	3,064,373	1,822,054
Loans held for sale	526,185	507,442
Interest receivable	13,069	7,241
Derivatives assets	9,690	19,745
Financial liabilities:
Deposits, With stated maturities	682,403	390,484
Interest payable	929	383
Long-term debt	149,135	47,377
Derivatives liabilities	1,699	586
Fair Value | Fair Value Level 3
Financial assets:
Available-for-sale securities, at fair value	3,604	4,549
Federal Home Loan Bank Stock	11,412	7,743
Loans, net	77,027	1,281
Mortgage servicing rights, net	$ 76,107	$ 33,081

Fair Value Measurements - Balan

Fair Value Measurements - Balances and Levels of Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financial assets:
Available-for-sale securities, at fair value	$ 543,992	$ 582,183
Mortgage servicing rights, net		33,081	$ 29,711	$ 6,032
Derivatives assets	9,690	19,745
Impaired loans	9,373	12,951
Financial liabilities:
Derivatives liabilities	1,699	586
Fair Value, Measurements, Recurring
Financial assets:
Available-for-sale securities, at fair value	543,992	582,183
Loans held for sale	526,185	507,442
Mortgage servicing rights, net	76,107
Derivatives assets	9,690	19,745
Financial liabilities:
Derivatives liabilities	1,699	586
Fair Value, Measurements, Recurring | U.S. Government Agency Securities
Financial assets:
Available-for-sale securities, at fair value	986	985
Fair Value, Measurements, Recurring | Mortgage-backed Securities
Financial assets:
Available-for-sale securities, at fair value	418,781	443,908
Fair Value, Measurements, Recurring | Municipals, Tax Exempt
Financial assets:
Available-for-sale securities, at fair value	109,251	116,923
Fair Value, Measurements, Recurring | Treasury Securities
Financial assets:
Available-for-sale securities, at fair value	7,252	11,757
Fair Value, Measurements, Recurring | Equity Securities
Financial assets:
Available-for-sale securities, at fair value	7,722	8,610
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Financial assets:
Available-for-sale securities, at fair value	540,388	577,634
Loans held for sale	526,185	507,442
Derivatives assets	9,690	19,745
Financial liabilities:
Derivatives liabilities	1,699	586
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government Agency Securities
Financial assets:
Available-for-sale securities, at fair value	986	985
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-backed Securities
Financial assets:
Available-for-sale securities, at fair value	418,781	443,908
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipals, Tax Exempt
Financial assets:
Available-for-sale securities, at fair value	109,251	116,923
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Treasury Securities
Financial assets:
Available-for-sale securities, at fair value	7,252	11,757
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity Securities
Financial assets:
Available-for-sale securities, at fair value	4,118	4,061
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Financial assets:
Available-for-sale securities, at fair value	3,604	4,549
Mortgage servicing rights, net	76,107
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity Securities
Financial assets:
Available-for-sale securities, at fair value	3,604	4,549
Fair Value, Measurements, Nonrecurring
Financial assets:
Mortgage servicing rights, net		32,070
Other real estate owned	13,174	2,315
Impaired loans	77,027	1,281
Fair Value, Measurements, Nonrecurring | Commercial and Industrial
Financial assets:
Impaired loans	1,971	542
Fair Value, Measurements, Nonrecurring | Consumer and Other
Financial assets:
Impaired loans	25,320	1
Fair Value, Measurements, Nonrecurring | Construction Loans | Commercial and Industrial
Financial assets:
Impaired loans	4,211
Fair Value, Measurements, Nonrecurring | 1-to-4 Family Mortgage | Residential Real Estate
Financial assets:
Impaired loans	21,902	103
Fair Value, Measurements, Nonrecurring | Owner Occupied | Commercial Real Estate
Financial assets:
Impaired loans	10,030	635
Fair Value, Measurements, Nonrecurring | Non-Owner Occupied | Commercial Real Estate
Financial assets:
Impaired loans	13,593
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
Financial assets:
Mortgage servicing rights, net		32,070
Other real estate owned	13,174	2,315
Impaired loans	77,027	1,281
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Commercial and Industrial
Financial assets:
Impaired loans	1,971	542
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Consumer and Other
Financial assets:
Impaired loans	25,320	1
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Construction Loans | Commercial and Industrial
Financial assets:
Impaired loans	4,211
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | 1-to-4 Family Mortgage | Residential Real Estate
Financial assets:
Impaired loans	21,902	103
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Owner Occupied | Commercial Real Estate
Financial assets:
Impaired loans	10,030	$ 635
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-Owner Occupied | Commercial Real Estate
Financial assets:
Impaired loans	$ 13,593

Fair Value Measurements - Recon

Fair Value Measurements - 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, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Balance at beginning of period	$ 4,549	$ 4,856
Impairment of equity securities	(945)
Capital distribution		(307)
Balance at end of period	$ 3,604	$ 4,549

Fair Value Measurements - Infor

Fair Value Measurements - Information about Significant Unobservable Inputs (Level 3) Used in Valuation of Assets Measured at Fair Value on Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Valuation of collateral | Minimum
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	0.00%	0.00%
Valuation of collateral | Maximum
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	30.00%	30.00%
Valuation of collateral | Impaired Loans
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair value of assets	$ 77,027	$ 1,281
Appraised value of property less costs to sell | Minimum
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	0.00%	0.00%
Appraised value of property less costs to sell | Maximum
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	15.00%	10.00%
Appraised value of property less costs to sell | Other Real Estate
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair value of assets	$ 13,174	$ 2,315
Discounted cash flows | Mortgage Servicing Rights Net
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair value of assets		$ 33,081

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Mortgage Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Net (losses) gains from fair value changes of mortgage loans	$ 9,111	$ (2,289)	$ 2,257
GNMA
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Mortgage loans held for sale measured at fair value	$ 43,035

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Differences between Fair Value and Principal Balance for Loans Held for Sale Measured at Fair Value (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Fair Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	$ 482,089	$ 507,442
Past due loans of 90 days or more	320
Nonaccrual loans	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	467,039	501,503
Past due loans of 90 days or more	320
Nonaccrual loans	741
Difference
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	$ 15,050	$ 5,939

Parent Company Only Financia124

Parent Company Only Financial Statements - Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 119,751	$ 136,327	$ 97,723	$ 49,954
Other assets	44,216	51,354
Goodwill	137,190	46,867	46,904
Total assets	4,727,713	3,276,881	2,899,420
Liabilities:
Long-term debt	143,302	44,892
Accrued expenses and other liabilities	118,994	58,368
Total liabilities	4,130,984	2,946,383
Shareholders' equity:
Common stock	30,536	24,108
Additional paid-in capital	418,596	213,480
Retained earnings	147,449	93,784
Accumulated other comprehensive (loss) income	148	(874)
Total shareholders' equity	596,729	330,498	236,674	215,228
Total liabilities and shareholders' equity	4,727,713	3,276,881
Parent Company
ASSETS
Cash and cash equivalents	25,789	30,993	$ 1,253	$ 551
Investments	1,129	2,074
Investments in Bank subsidiary	595,625	325,574
Other assets	5,411	2,972
Goodwill	29	29
Total assets	627,983	361,642
Liabilities:
Long-term debt	30,930	30,930
Accrued expenses and other liabilities	324	214
Total liabilities	31,254	31,144
Shareholders' equity:
Common stock	30,536	24,108
Additional paid-in capital	418,596	213,480
Retained earnings	147,449	93,784
Accumulated other comprehensive (loss) income	148	(874)
Total shareholders' equity	596,729	330,498
Total liabilities and shareholders' equity	$ 627,983	$ 361,642

Parent Company Only Financia125

Parent Company Only Financial Statements - Income Statements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income
Other interest income	$ 1,554	$ 611	$ 468
Net interest income	153,271	110,950	93,872
Expenses
Interest expense	16,342	9,544	8,910
Other noninterest expense	27,744	22,212	17,786
Net income	52,398	40,591	47,856
Parent Company
Income
Other interest income	41	33	33
Interest income from Bank subsidiary		95	121
Gain (loss) on investments	(945)	417
Dividend income from Bank subsidiary		14,875	25,105
Earnings from Bank subsidiary	54,713	26,859	23,879
Net interest income	53,809	42,279	49,138
Expenses
Interest expense	1,491	1,393	1,298
Salaries, legal and professional fees	893	315	3
Other noninterest expense	296	168	59
Federal and state income tax benefit	(1,269)	(188)	(78)
Total expenses	1,411	1,688	1,282
Net income	$ 52,398	$ 40,591	$ 47,856

Parent Company Only Financia126

Parent Company Only Financial Statements - Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities
Net income	$ 52,398	$ 40,591	$ 47,856
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	6,760	4,693
Financing Activities
Dividends paid		(69,300)	(25,350)
Net proceeds from sale of common stock	153,356	116,054
Net change in cash and cash equivalents	(16,576)	38,604	47,769
Cash and cash equivalents at beginning of the period	136,327	97,723	49,954
Cash and cash equivalents at end of the period	119,751	136,327	97,723
Supplemental cash flow information:
Conversion of cash-settled to stock settled compensation		5,388
Parent Company
Operating Activities
Net income	52,398	40,591	47,856
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed income of subsidiary bank	(54,713)	(26,859)	(23,879)
Loss (gain) on investments	945	(417)
Stock-based compensation expense		4,693
(Increase) decrease in other assets	(2,439)	(427)	1,292
Increase (decrease) in other liabilities	(551)	(5,251)	23
Other, net		7	(1)
Net cash provided by operating activities	(4,360)	12,337	25,291
Investing Activities
Other investments		724	761
Net cash provided by investing activities		724	761
Financing Activities
Equity contribution to Bank	(154,200)	(20,000)
Dividends paid		(69,300)	(25,350)
Payment of subordinated debt		(10,075)
Net proceeds from sale of common stock	153,356	116,054
Net cash (used in) provided by financing activities	(844)	16,679	(25,350)
Net change in cash and cash equivalents	(5,204)	29,740	702
Cash and cash equivalents at beginning of the period	30,993	1,253	551
Cash and cash equivalents at end of the period	$ 25,789	30,993	$ 1,253
Supplemental cash flow information:
Conversion of cash-settled to stock settled compensation		5,388
Forgiveness of intercompany debt		$ 6,024

Segment Reporting - Additional

Segment Reporting - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)Segment	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	2
Interest paid	$ 15,470	$ 9,474	$ 8,985
Interest income	153,969	105,865	87,723
Mortgage Segment
Segment Reporting Information [Line Items]
Interest paid	$ 16,932	$ 12,636	8,688
Mortgage Segment | Prime Interest Rate
Segment Reporting Information [Line Items]
Warehouse line of credit interest rate	4.50%	3.75%		3.50%
Banking Segment
Segment Reporting Information [Line Items]
Interest income	$ 16,932	$ 12,636	$ 8,688

Segment Reporting - Schedule of

Segment Reporting - Schedule of Segment Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net interest income	$ 153,271	$ 110,950	$ 93,872
Provision for loan losses	(950)	(1,479)	(3,064)
Mortgage banking income	120,357	117,751	70,190
Change in fair value of mortgage servicing rights	(3,424)
Other noninterest income	24,648	26,934	22,190
Depreciation and amortization	4,316	3,995	3,283
Amortization of intangibles	1,995	2,132	1,731
Amortization and impairment of mortgage servicing rights		12,999	2,795
Loss on sale of mortgage servicing rights	249	4,447
Other noninterest mortgage banking expense	98,296	82,351	56,138
Other noninterest expense	117,461	88,866	74,545
Income before income taxes	73,485	62,324	50,824
Income tax expense	21,087	21,733	2,968
Net income	52,398	40,591	47,856
Total assets	4,727,713	3,276,881	2,899,420
Goodwill	137,190	46,867	46,904
Banking Segment
Segment Reporting Information [Line Items]
Net interest income	153,018	112,365	92,366
Provision for loan losses	(950)	(1,479)	(3,070)
Mortgage banking income	26,737	25,542	18,718
Other noninterest income	24,648	26,934	22,190
Depreciation and amortization	3,801	3,506	2,933
Amortization of intangibles	1,995	2,132	1,731
Other noninterest mortgage banking expense	21,714	16,095	13,189
Other noninterest expense	117,461	88,866	74,545
Income before income taxes	60,382	55,721	43,946
Total assets	4,130,349	2,752,773	2,570,071
Goodwill	137,090	46,767	46,804
Mortgage Segment
Segment Reporting Information [Line Items]
Net interest income	253	(1,415)	1,506
Provision for loan losses			6
Mortgage banking income	93,620	92,209	51,472
Change in fair value of mortgage servicing rights	(3,424)
Depreciation and amortization	515	489	350
Amortization and impairment of mortgage servicing rights		12,999	2,795
Loss on sale of mortgage servicing rights	249	4,447
Other noninterest mortgage banking expense	76,582	66,256	42,949
Income before income taxes	13,103	6,603	6,878
Total assets	597,364	524,108	329,349
Goodwill	$ 100	$ 100	$ 100

Segment Reporting - Schedule129

Segment Reporting - Schedule of Segment Financial Information (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Merger and conversion	$ 19,034	$ 3,268	$ 3,543
Clayton Banks
Segment Reporting Information [Line Items]
Merger and conversion	$ 19,034
Northwest Georgia Bank
Segment Reporting Information [Line Items]
Merger and conversion		$ 3,268	$ 3,543

Minimum Capital Requirements -

Minimum Capital Requirements - Additional Information (Details)	12 Months Ended
	Dec. 31, 2017
Banking And Thrift [Abstract]
Capital conservative buffer percentage	2.50%
Description of capital adequacy purposes	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. The capital conservative buffer will be fully phased in January 1, 2019 at 2.5 percent.

Minimum Capital Requirements131

Minimum Capital Requirements - Schedule of Actual and Required Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
FB Financial Corporation
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital (to risk-weighted assets), Actual Amount	$ 496,422	$ 338,893
Total Capital (to risk-weighted assets), Actual Ratio	12.01%	13.03%
Total Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 330,672	$ 208,069
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	$ 382,340	$ 224,325
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	9.25%	8.63%
Tier 1 Capital (to risk-weighted assets), Actual Amount	$ 472,381	$ 317,146
Tier 1 Capital (to risk-weighted assets), Actual Ratio	11.43%	12.19%
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 247,969	$ 156,101
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	$ 299,629	$ 172,362
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	7.25%	6.63%
Tier 1 Capital (to average assets), Actual Amount	$ 472,381	$ 317,146
Tier 1 Capital (to average assets), Actual Ratio	10.46%	10.05%
Tier 1 Capital (to average assets), For capital adequacy purposes, Amount	$ 180,643	$ 126,227
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	$ 442,381	$ 287,146
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio	10.71%	11.04%
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 185,874	$ 117,043
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	$ 237,506	$ 133,299
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	5.75%	5.13%
FirstBank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital (to risk-weighted assets), Actual Amount	$ 466,102	$ 304,018
Total Capital (to risk-weighted assets), Actual Ratio	11.30%	11.72%
Total Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 329,984	$ 207,521
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	$ 381,544	$ 223,733
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	9.25%	8.63%
Total Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Amount	$ 412,480	$ 259,401
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	$ 442,061	$ 282,271
Tier 1 Capital (to risk-weighted assets), Actual Ratio	10.72%	10.88%
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 247,422	$ 155,664
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	$ 298,968	$ 171,879
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	7.25%	6.63%
Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions Amount	$ 247,422	$ 155,664
Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions Ratio	6.00%	6.00%
Tier 1 Capital (to average assets), Actual Amount	$ 442,061	$ 282,271
Tier 1 Capital (to average assets), Actual Ratio	9.77%	8.95%
Tier 1 Capital (to average assets), For capital adequacy purposes, Amount	$ 180,987	$ 126,155
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	$ 226,234	$ 157,693
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	$ 442,061	$ 282,271
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio	10.72%	10.88%
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 185,567	$ 116,748
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	$ 237,113	$ 132,963
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	5.75%	5.13%
Common Equity Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Amount	$ 268,041	$ 168,636
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, 2014USD ($)	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)shares	Dec. 31, 2015USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
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				$ 2,344,000	$ 1,379,000	$ 1,290,000
Discretionary contribution percentage				25.00%	25.00%	25.00%
Post retirement benefits payable				$ 1,510,000	$ 2,023,000
Expense related to plans				4,000	30,000	$ 313,000
Payments to participants				191,000	205,000	202,000
Cash surrender value on bank owned life insurance				10,873,000	10,556,000
Cash value income				$ 164,000	181,000	136,000
Description of stock split				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.
Stock split ratio		0.01
Deferred compensation				$ 5,301,000	6,710,000
Salaries, commissions and employee benefits				130,355,000	113,992,000	$ 84,214,000
Deferred Compensation Plans and Agreements
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Payments to participants				$ 5,163,000	1,601,000
Description of stock split				100-for-one stock split
Stock split ratio				100
Other liabilities				$ 2,346,000	$ 3,758,000
Accrued compensation reclassified to additional paid in capital				$ 5,388
Number of units remaining in equity based incentive plan for cash settlement | shares				67,470	180,447
Salaries, commissions and employee benefits				$ 3,685,000	$ 5,073,000
Deferred Compensation Plans and Agreements | Chief Executive Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
IPO price | $ / shares				$ 19
Deferred compensation			$ 3,000,000
Deferred compensation payment date			Dec. 31, 2019
Deferred stock units issued | 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
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%
Share-based compensation terms of award, description				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.
Deferred Compensation Plans and Agreements | Preferred EBI Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation terms of award, description				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.
Deferred Compensation Plans and Agreements | 2012 EBI Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation award vesting period				3 years
Employee retirement age under EBI plan				65 years
Share-based compensation terms of award, description				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).
Fair market value per EBI | $ / shares				$ 21.4085
IPO price | $ / shares				$ 19

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Vested and Unvested Restricted Stock Units Outstanding (Details) - Restricted Stock Units (RSUs) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted Stock Units Outstanding, Balance, beginning of period	1,200,840
Restricted Stock Units Outstanding, Conversion of deferred compensation plan		157,895
Restricted Stock Units Outstanding, Conversion of equity based incentive (EBI) plans		125,684
Restricted Stock Units Outstanding, Grants	123,169	1,077,066
Restricted Stock Units Outstanding, Released and distributed (vested)	(103,639)	(157,748)
Restricted Stock Units Outstanding, Forfeited/expired	(6,045)	(2,057)
Restricted Stock Units Outstanding, Balance, end of period	1,214,325	1,200,840
Weighted Average Grant Date Fair Value, Balance, beginning of period	$ 19
Weighted Average Grant Date Fair Value, Conversion of deferred compensation plan	19	$ 19
Weighted Average Grant Date Fair Value, Conversion of equity based incentive (EBI) plans	19	19
Weighted Average Grant Date Fair Value, Grants	35.15	19
Weighted Average Grant Date Fair Value, Released and distributed (vested)	21.25	19
Weighted Average Grant Date Fair Value, Forfeited/expired	19	19
Weighted Average Grant Date Fair Value, Balance, end of period	$ 19.97	$ 19

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($)	12 Months Ended
	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	$ 6,760,000	$ 4,693,000
Expense related to cash settled EBI	1,213,000	337,000
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of restricted stock units vested and released	2,202,000	2,997,000
Compensation cost related to stock grants and vesting of restricted stock units	8,184,000	4,693,000
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	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	$ 12,950,000	$ 15,721,000
Expected weighted-average period to be recognized	2 years 9 months 18 days	3 years 7 months 28 days
EBI Units remaining in equity based incentive plans for employees, units	67,470	180,477
EBI Units remaining in equity based incentive plans for employees, value	$ 2,833,000	$ 4,683,000
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of shares issuable		200,000
Purchase price percentage of subsequent offering periods		95.00%
IPO price		$ 19
Maximum number of shares per participant		725
Maximum worth of award per participant		$ 25,000,000
Shares issued under plan	18,658	20,377
Number of shares reserved for issuance	2,460,965	2,479,623

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, 2017USD ($)
Related Party Transactions [Abstract]
Loans outstanding, Beginning balance	$ 27,370
New loans and advances	1,204
Change in related party status	(624)
Repayments	(6,938)
Loans outstanding, Ending balance	$ 21,012

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands	Sep. 15, 2016	Aug. 15, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2006	Aug. 26, 1999	Feb. 12, 1996
Related Party Transaction [Line Items]
Unfunded commitments			$ 2	$ 1
Deposits from related parties			110,465	150,373
Aviation Time Sharing Agreement
Related Party Transaction [Line Items]
Payments to related party			176	313
Initial Public Offering
Related Party Transaction [Line Items]
Repayments of subordinated debt	$ 10,075	$ 10,075
Certain Executive Officers, Certain Management and Directors and Their Associates
Related Party Transaction [Line Items]
Unfunded commitments			4,672	6,838
Director
Related Party Transaction [Line Items]
Unamortized leasehold improvements			137		$ 158
Lease expense			504	522	503
Amount of investment held by the company			$ 200	1,145
Then-sole shareholder
Related Party Transaction [Line Items]
Paid for management consulting services					$ 306
Ownership percentage held by shareholder					100.00%
Subordinated debt						$ 6,000	$ 3,300	$ 775
Payment of interest				$ 230	$ 237

Subsequent Event - Additional I

Subsequent Event - Additional Information (Details)	Mar. 30, 2018
Subsequent Event
Subsequent Event [Line Items]
Subsequent event, evaluation date	Mar. 16, 2018