Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2018	Aug. 03, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Trading Symbol	FBK
Entity Registrant Name	FB Financial Corp
Entity Central Index Key	0001649749
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		30,685,209

Consolidated balance sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 67,863	$ 29,831
Federal funds sold	19,859	66,127
Interest bearing deposits in financial institutions	16,695	23,793
Cash and cash equivalents	104,417	119,751
Investments:
Available-for-sale debt securities, at fair value	608,360	536,270
Equity securities, at fair value	3,075	7,722
Federal Home Loan Bank stock, at cost	12,641	11,412
Loans held for sale, at fair value	374,916	526,185
Loans	3,415,575	3,166,911
Less: allowance for loan losses	26,347	24,041
Net loans	3,389,228	3,142,870
Premises and equipment, net	85,936	81,577
Other real estate owned, net	14,639	16,442
Interest receivable	12,729	13,069
Mortgage servicing rights, at fair value	109,449	76,107
Goodwill	137,190	137,190
Core deposit and other intangibles, net	13,203	14,902
Other assets	57,466	44,216
Total assets	4,923,249	4,727,713
Demand deposits
Noninterest-bearing	970,851	888,200
Interest-bearing	2,027,776	1,909,546
Savings deposits	181,127	178,320
Customer time deposits	664,255	602,628
Brokered and internet time deposits	65,854	85,701
Total time deposits	730,109	688,329
Total deposits	3,909,863	3,664,395
Securities sold under agreements to repurchase	15,996	14,293
Short-term borrowings	187,522	190,000
Long-term debt	139,375	143,302
Accrued expenses and other liabilities	39,534	118,994
Total liabilities	4,292,290	4,130,984
Shareholders' equity:
Common stock, $1 par value per share; 75,000,000 shares authorized; 30,683,353 and 30,535,517 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	30,683	30,536
Additional paid-in capital	420,382	418,596
Retained earnings	187,250	147,449
Accumulated other comprehensive (loss) income, net	(7,356)	148
Total shareholders' equity	630,959	596,729
Total liabilities and shareholders' equity	$ 4,923,249	$ 4,727,713

Consolidated balance sheets (Parenthetical) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
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	30,683,353	30,535,517
Common stock, shares outstanding	30,683,353	30,535,517

Consolidated statements of income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income:
Interest and fees on loans	$ 54,529	$ 29,350	$ 105,222	$ 58,356
Interest on securities
Taxable	3,134	2,589	5,986	5,156
Tax-exempt	981	1,068	1,906	2,108
Other	399	271	777	547
Total interest income	59,043	33,278	113,891	66,167
Deposits
Demand and savings accounts	3,951	1,703	7,266	3,234
Time deposits	1,947	604	3,703	1,187
Short-term borrowings	694	112	1,116	210
Long-term debt	934	432	1,860	858
Total interest expense	7,526	2,851	13,945	5,489
Net interest income	51,517	30,427	99,946	60,678
Provision for loan losses	1,063	(865)	1,380	(1,122)
Net interest income after provision for loan losses	50,454	31,292	98,566	61,800
Noninterest income:
Mortgage banking income	28,544	30,239	55,015	55,319
(Loss) gain from securities, net	(42)	29	(89)	30
(Loss) gain from other assets	(155)	39	(87)	39
Other income	1,500	543	2,805	1,174
Total noninterest income	35,763	35,657	69,038	66,744
Noninterest expenses:
Salaries, commissions and employee benefits	34,508	30,783	68,657	59,789
Occupancy and equipment expense	3,744	3,307	7,349	6,416
Legal and professional fees	1,965	1,033	4,008	2,461
Data processing	2,138	1,460	4,173	2,961
Merger and conversion		767	1,193	1,254
Amortization of core deposit and other intangibles	802	123	1,655	515
Loss on sale of mortgage servicing rights		249		249
Regulatory fees and deposit insurance assessments	730	494	1,292	929
Software license and maintenance fees	390	364	857	821
Advertising	3,408	3,343	6,690	6,275
Other expense	8,673	7,213	16,635	13,883
Total noninterest expense	56,358	49,136	112,509	95,553
Income before income taxes	29,859	17,813	55,095	32,991
Income tax expense (Note 7)	7,794	6,574	13,276	11,999
Net income	$ 22,065	$ 11,239	$ 41,819	$ 20,992
Earnings per common share:
Basic	$ 0.72	$ 0.44	$ 1.36	$ 0.84
Fully diluted	0.70	$ 0.43	1.33	$ 0.82
Dividends declared per common share	$ 0.06		$ 0.06
Service Charges on Deposit Accounts
Noninterest income:
Noninterest income:	$ 2,132	$ 1,796	$ 4,229	$ 3,562
ATM and Interchange Fees
Noninterest income:
Noninterest income:	2,581	2,085	4,942	4,132
Investment Services and Trust Income
Noninterest income:
Noninterest income:	1,180	903	2,386	1,717
Gain (Loss) on Sales or Write-Downs of Other Real Estate Owned
Noninterest income:
Noninterest income:	$ 23	$ 23	$ (163)	$ 771

Consolidated statements of comprehensive income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 22,065	$ 11,239	$ 41,819	$ 20,992
Other comprehensive (loss) income, net of tax:
Net change in unrealized (loss) gain in available-for-sale securities, net of taxes of ($780), $1,053, ($3,319) and $1,408	(2,026)	1,631	(9,096)	2,180
Reclassification adjustment for (gain) loss on securities included in net income, net of taxes of $0, $11, ($2) and $12		(18)	7	(18)
Net change in unrealized gain in hedging activities, net of taxes of $69, $0, $518 and $0	196		1,469
Reclassification adjustment for (gain) loss on hedging activities, net of taxes of $6, $0, $2 and $0	(25)		7
Total other comprehensive (loss) income, net of tax	(1,855)	1,613	(7,613)	2,162
Comprehensive income	$ 20,210	$ 12,852	$ 34,206	$ 23,154

Consolidated statements of comprehensive income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net change in unrealized (loss) gain in available-for-sale, tax	$ (780)	$ 1,053	$ (3,319)	$ 1,408
Reclassification adjustment for (gain) loss on securities, tax	0	11	(2)	12
Net change in unrealized gain in hedging activities, tax	69	0	518	0
Reclassification adjustment for (gain) loss on hedging activities, tax	$ 6	$ 0	$ 2	$ 0

Consolidated statements of changes in shareholders' equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss), Net
Balance at Dec. 31, 2016	$ 330,498	$ 24,108	$ 213,480	$ 93,784	$ (874)
Initial fair value election on mortgage servicing rights, net of taxes of $396 (See Note 1)	615			615
Net income	20,992			20,992
Other comprehensive income (loss), net of taxes	2,162				2,162
Common stock issued, net of offering costs	152,721	4,807	147,914
Stock-based compensation expense	3,154	6	3,148
Restricted stock units vested and distributed, net of shares withheld for taxes	(625)	47	(672)
Balance at Jun. 30, 2017	509,517	28,968	363,870	115,391	1,288
Balance at Dec. 31, 2017	596,729	30,536	418,596	147,449	148
Initial adoption of ASU 2016-01 (See Note 1)				(109)	109
Net income	41,819			41,819
Other comprehensive income (loss), net of taxes	(7,613)				(7,613)
Stock-based compensation expense	3,819	6	3,813
Restricted stock units vested and distributed, net of shares withheld for taxes	(2,555)	124	(2,679)
Shares issued under employee stock purchase program	669	17	652
Dividends declared ($0.06 per share)	(1,909)			(1,909)
Balance at Jun. 30, 2018	$ 630,959	$ 30,683	$ 420,382	$ 187,250	$ (7,356)

Consolidated statements of changes in shareholders' equity (Unaudited) (Parenthetical) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Statement Of Stockholders Equity [Abstract]
Fair Value Election on Mortgage Servicing Rights Retained Earnings Adjustment, Tax	$ 396

Consolidated Statements of Cash Flows (Unaudited) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Cash flows from operating activities:
Net income	$ 41,819	$ 20,992
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	2,238	1,993
Amortization of core deposits and other intangibles	1,655	515
Capitalization of mortgage servicing rights	(29,814)	(29,659)
Net change in fair value of mortgage servicing rights	(3,528)	2,341
Stock-based compensation expense	3,819	3,154
Provision for loan losses	1,380	(1,122)
Provision for mortgage loan repurchases	392	384
Accretion of discounts on purchased loans	(3,615)	(848)
Accretion of discounts and amortization of premiums on securities, net	1,378	1,290
Loss (gain) from securities, net	89	(30)
Originations of loans held for sale	(3,287,255)	(2,944,481)
Repurchases of loans held for sale	(3,222)
Proceeds from sale of loans held for sale	3,441,316	3,071,027
Gain on sale and change in fair value of loans held for sale	(48,109)	(52,165)
Gain on sale of mortgage servicing rights		(17)
Net loss (gain) or write-downs of other real estate owned	163	(771)
Loss (gain) on other assets	87	(39)
Provision for deferred income taxes	11,081	7,952
Changes in:
Other assets and interest receivable	(8,435)	6,303
Accrued expenses and other liabilities	(42,630)	(18,785)
Net cash provided by operating activities	78,809	68,034
Activity in available-for-sale securities:
Sales	221	12,158
Maturities, prepayments and calls	34,508	41,851
Purchases	(121,108)	(22,885)
Net increase in loans	(239,188)	(114,201)
Purchases of FHLB stock	(1,229)
Proceeds from sale of mortgage servicing rights		11,952
Purchases of premises and equipment	(6,597)	(1,734)
Proceeds from the sale of premises and equipment		39
Proceeds from the sale of other real estate owned	2,209	2,930
Net cash used in investing activities	(331,184)	(69,890)
Cash flows from financing activities:
Net increase in demand and savings deposits	203,688	50,461
Net increase in time deposits	41,780	5,570
Net increase (decrease) in securities sold under agreements to repurchase	1,703	(5,218)
Decrease in short-term borrowings	(2,478)	(150,000)
Decrease in long-term debt	(3,927)	(1,102)
Share based compensation withholding obligation	(2,555)	(625)
Net proceeds from sale of common stock	669	152,721
Dividends paid	(1,839)
Net cash provided by financing activities	237,041	51,807
Net change in cash and cash equivalents	(15,334)	49,951
Cash and cash equivalents at beginning of the period	119,751	136,327
Cash and cash equivalents at end of the period	104,417	186,278
Supplemental cash flow information:
Interest paid	13,269	5,608
Taxes paid	19,112	18,122
Supplemental noncash disclosures:
Transfers from loans to other real estate owned	1,014	1,162
Transfers from other real estate owned to loans	445	36
Transfers from loans held for sale to loans	5,504	5,645
Derecognition of rebooked GNMA delinquent loans (See Note 1)	43,035
Dividends declared not paid on restricted stock units	(70)
Adoption of ASU 2016-01 (See Note 1)	$ (109)
Fair value election of mortgage servicing rights		$ 1,011

Basis of Presentation

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Basis of presentation

Note (1)—Basis of presentation:

FB Financial Corporation (the “Company”) is a bank holding company, headquartered in Nashville, Tennessee. The Company operates through its wholly owned bank subsidiary, FirstBank (the “Bank”), with 56 full-service bank branches across Tennessee, North Alabama and North Georgia, and a national mortgage business with office locations across the Southeast.

The consolidated financial statements, including the notes thereto of the Company, have been prepared in accordance with United States generally accepted accounting principles (“GAAP”) interim reporting requirements, and therefore do not include all information and notes included in the annual consolidated financial statements in conformity with GAAP. These interim consolidated financial statements and notes thereto should be read in conjunction with the Company’s audited consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K.

The unaudited consolidated financial statements include all adjustments, consisting of normal recurring adjustments, necessary for a fair presentation of the results for the interim periods. The results for interim periods are not necessarily indicative of results for a full year.

The accompanying consolidated financial statements have been prepared in conformity with GAAP 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 periods then ended. Actual results could differ significantly from those estimates.

Certain prior period amounts have been reclassified to conform to the current period presentation without any impact on the reported amounts of net income or shareholders’ equity.

Effective 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. See Note 2, “Mergers and acquisitions” in these Notes to the consolidated unaudited financial statements for further details regarding acquisitions.

Prior to May 31, 2018, the Company was considered a “controlled company” and was controlled by the Company’s Executive Chairman and former majority shareholder, James W. Ayers. During the second quarter of 2018, the Company completed a secondary offering of 3,680,000 shares of common stock pursuant to the Company’s effective registration statement on Form S-3 whereby James W. Ayers was the seller. As a result of this transaction, the Company ceased to qualify as a “controlled company” as the selling shareholder’s ownership was reduced to approximately 44% of the voting power of the Company’s issued and outstanding shares of common stock. The Company continues to qualify as an emerging growth company as defined by the “Jumpstart Our Business Startups Art” (“JOBS Act”).

Subsequent events

The Company has evaluated, for consideration of recognition or disclosure, subsequent events that occurred through the date of issuance of these financial statements. The Company has determined that there were no other subsequent events other than described below that occurred after June 30, 2018, but prior to the issuance of these financial statements that would have a material impact on the Company’s consolidated financial statements.

On July 19, 2018, the Company declared a regular quarterly dividend of $0.06 per share to be paid on August 15, 2018 to shareholders of record as of July 31, 2018, totaling approximately $1,909.

On August 7, 2018, the Federal Home Loan Bank of Cincinnati increased the capacity on the Company’s line of credit from $300,000 to $800,000.

Earnings per share

Basic earnings per common share (“EPS”) excludes dilution and is computed by dividing earnings attributable to common shareholders by the weighted average number of common shares outstanding during the period. Diluted EPS includes the dilutive effect of additional potential common shares issuable under the restricted stock units granted but not yet vested and distributable. Diluted EPS is computed by dividing earnings attributable to common shareholders by the weighted average number of common shares outstanding for the year, plus an incremental number of common-equivalent shares computed using the treasury stock method.

Unvested share-based payment awards, which include the right to receive non-forfeitable dividends or dividend equivalents, are considered to participate with common shareholders in undistributed earnings for purposes of computing EPS. Companies that have such participating securities, including FB Financial, are required to calculate basic and diluted EPS using the two-class method. Certain restricted stock awards granted by the Company include non-forfeitable dividend equivalents and are considered participating securities. Calculations of EPS under the two-class method (i) exclude from the numerator any dividends paid or owed on participating securities and any undistributed earnings considered to be attributable to participating securities and (ii) exclude from the denominator the dilutive impact of the participating securities.

The following is a summary of the basic and diluted earnings per common share calculation for each of the periods presented:

	Three Months Ended June 30,					Six Months Ended June 30,
	2018			2017		2018			2017
Basic earnings per share calculation:
Net income	$	22,065		$	11,239	$	41,819		$	20,992
Dividends paid on and undistributed earnings allocated to participating securities		(117	)		—		(223	)		—
Earnings attributable to common shareholders	$	21,948		$	11,239	$	41,596		$	20,992
Weighted-average basic shares outstanding		30,678,732			25,741,968		30,646,189			24,944,633
Basic earnings per share	$	0.72		$	0.44	$	1.36		$	0.84
Diluted earnings per share:
Earnings attributable to common shareholders	$	21,948		$	11,239	$	41,596		$	20,992
Weighted-average basic shares outstanding		30,678,732			25,741,968		30,646,189			24,944,633
Weighted-average diluted shares contingently issuable		615,312			559,490		629,657			505,786
Weighted-average diluted shares outstanding		31,294,044			26,301,458		31,275,846			25,450,419
Diluted earnings per share	$	0.70		$	0.43	$	1.33		$	0.82

Rebooked GNMA loans included in loans held for sale

Government National Mortgage Association (“GNMA”) optional repurchase programs allow financial institutions to buy back individual delinquent mortgage loans that meet certain criteria from the securitized loan pool for which the institution provides servicing and was the original transferor. At the servicer’s option and without GNMA’s prior authorization, the servicer may repurchase such a delinquent loan for an amount equal to 100 percent of the remaining principal balance of the loan. Under FASB ASC Topic 860, “Transfers and Servicing,” this buy-back option is considered a conditional option until the delinquency criteria are met, at which time the option becomes unconditional. When the Company is deemed to have regained effective control over these loans under the unconditional buy-back option, the loans can no longer be reported as sold and must be brought back onto the balance sheet as loans held for sale, regardless of whether the Company intends to exercise the buy-back option if the buyback option provides the transferor a more-than-trivial benefit. At June 30, 2018, there were $52,212 of delinquent GNMA loans that had previously been sold; however, the Company determined there was not a “more-than-trivial benefit” based on an analysis of interest rates and an assessment of potential reputational risk associated with these loans. As such, the Company did not rebook the GNMA loans as of June 30, 2018. At December 31, 2017, rebooked GNMA loans held for sale amounted to $43,035 with an offsetting liability included in accrued expenses and other liabilities in the same amount. The fair value option election does not apply to the GNMA optional repurchase loans which do not meet the requirements under FASB ASC Topic 825 to be accounted for under the fair value option.

Recently adopted accounting principles:

Except as set forth below, the Company did not adopt any new accounting policies that were not disclosed in the Company’s 2017 audited consolidated financial statements included on Form 10-K.

On January 1, 2018, the Company adopted the following newly issued accounting standards:

In May 2014, the FASB issued an update to Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers”. The Company adopted this guidance on January 1, 2018 and all subsequent amendments to the ASU (collectively, “ASC 606”) which (i) creates a single framework for recognizing revenue from contracts with customers that fall within its scope and (ii) revises when it is appropriate to recognize a gain (loss) from the transfer of nonfinancial assets, such as OREO. The majority of the Company’s revenues come from interest income and other sources, including loans, leases, securities and derivatives that are outside the scope of ASC 606. The Company’s services that fall within the scope of ASC 606 are presented within Noninterest income and are recognized as revenue as the Company satisfies its obligation to the customer. Services within the scope of ASC 606 include deposit service charges on deposits, interchange income, investment services and trust income, and the sale of OREO, all within the Banking Segment. The Company has evaluated the effect of this updated on these fee-based income streams and concluded that adoption did not result in a change to the accounting for any of the in-scope revenue streams; as such, no cumulative effect adjustment was recorded.

The following is a summary of the implementation considerations for the revenue streams that fall within the scope of Topic 606:

•

Service charges on deposits, investment services and trust income, and interchange fees — Fees from these services are either transaction based, for which the performance obligations are satisfied when the individual transaction is processed, or set periodic service charges, for which the performance obligations are satisfied over the period the service is provided. Transaction based fees are recognized at the time the transaction is processed, and periodic service charges are recognized over the service period. The adoption of Topic 606 had no impact on the Company's revenue recognition practice for these services.

•

Gains on sales of other real estate — ASU 2014-09 creates Topic 610-20, under which a gain on sale should be recognized when a contract for sale exists and control of the asset has been transferred to the buyer. Topic 606 list several criteria which must exist to conclude that a contract for sale exists, including a determination that the institution will collect substantially all of the consideration to which it is entitled. This presents a key difference between the current and new guidance related to the recognition of the gain when the institution finances the sale of the property. Rather than basing recognition on the amount of the buyer's initial investment, which was the primary consideration under prior guidance, the analysis is now based on various factors including not only the loan to value, but also the credit quality of the borrower, the structure of the loan, and any other factors that may affect collectability. While these differences may affect the decision to recognize or defer gains on sales of other real estate in circumstances where the Company has financed the sale, these amounts have not been material to its financial statements.

In January 2016, the FASB released ASU 2016-01, “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. Results for reporting periods beginning after January 1, 2018 are presented under this method while prior period disclosures are presented under legacy GAAP. On January 1, 2018, the Company recorded a net loss in beginning retained earnings of $109 in connection with this transition.

In August 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments (Topic 230).” ASU 2016-15 provides guidance related to certain cash flow issues in order to reduce the current and potential future diversity in practice. This adoption did not have an impact on our financial statements.

In May 2017, the FASB issued ASU 2017-09, “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. The adoption of this update on January 1, 2018 did not have a significant impact on the Company’s consolidated financial statements.

In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities.” The amendments in this ASU make more financial and non-financial hedging strategies eligible for hedge accounting. It also amends the presentation and disclosure requirements and changes how companies assess effectiveness. There was no impact to the Company’s financial statements or disclosures as a result of this early adoption as of January 1, 2018.

Newly issued not yet effective accounting standards:

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.

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 March 2017, the FASB issued ASU 2017-08, “Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities.” The amendments in this ASU shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount, which continue to be amortized to maturity. Public business entities must prospectively apply the amendments in this ASU to annual periods beginning after December 15, 2018, including interim periods. The adoption of this update will not have an impact on the Company’s consolidated financial statements.

Mergers and acquisitions

6 Months Ended

Jun. 30, 2018

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 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 accelerating 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 $0 and $1,193 in merger and conversion expenses during the three and six months ended June 30, 2018 compared with $767 and $1,254 for the same periods in 2017.

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 carrying 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 the three and six months ended June 30, 2018 include the operating results of the acquired assets and assumed liabilities of the Clayton Banks.

As of December 31, 2017, the Company finalized its valuation of all assets acquired and liabilities assumed, resulting in no material changes to preliminary purchase accounting adjustments. The following tables present the final estimated fair value of net assets acquired as of the July 31, 2017 acquisition date and the consideration paid and an allocation of the purchase price to net assets acquired:

	As of July 31, 2017
	As Recorded by FB Financial Corporation⁽¹⁾
Assets
Cash and cash equivalents	$	49,059
Investment securities		59,493
FHLB stock		3,409
Loans		1,059,728
Allowance for loan losses		—
Premises and equipment		18,866
Other real estate owned		6,888
Intangibles, net		12,334
Other assets		5,978
Total assets	$	1,215,755
Liabilities
Interest-bearing deposits	$	670,054
Non-interest bearing deposits		309,464
Borrowings		84,831
Accrued expenses and other liabilities		5,245
Total liabilities	$	1,069,594
Net assets acquired	$	146,161

Purchase price:
Equity consideration
Common stock issued		1,521,200
Price per share as of July 31, 2017	$	34.37
Total equity consideration			$	52,284
Cash consideration				184,200	⁽²⁾
Total consideration paid			$	236,484
Preliminary allocation of consideration paid:
Fair value of net assets acquired including identifiable intangible assets			$	146,161
Goodwill				90,323
Total consideration paid			$	236,484

(1)	Amounts include certain reclassifications of opening balances to conform to the Company’s presentation.

(2)	Amount was deposited into an interest-bearing account with the Bank in the name of the Seller as of July 31, 2017.

The following unaudited pro forma condensed consolidated financial information presents the results of operations for the three and six months ended June 30, 2017 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 period 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 include the effect of all cost-saving or revenue-enhancing strategies.

	Three Months Ended June 30,		Six Months Ended June 30,
	2017		2017
Net interest income	$	47,404	$	94,091
Total revenues	$	84,545	$	163,826
Net income	$	17,290	$	34,018

Investment securities

6 Months Ended

Jun. 30, 2018

Investments Debt And Equity Securities [Abstract]

Investment securities

Note (3)—Investment securities:

The amortized cost of securities and their fair values at June 30, 2018 and December 31, 2017 are shown below:

	June 30, 2018
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair Value
Investment Securities
Available-for-sale debt securities
U.S. government agency securities	$	999	$	—	$	(16	)	$	983
Mortgage-backed securities - residential		494,599		169		(16,794	)		477,974
Municipals, tax exempt		122,710		1,472		(1,935	)		122,247
Treasury securities		7,364		—		(208	)		7,156
Total	$	625,672	$	1,641	$	(18,953	)	$	608,360

As of June 30, 2018, the Company also had $3,075 in marketable equity securities recorded at fair value. Net losses of $43 and $81 were recognized due to changes in fair value of these securities during the three and six months ended June 30, 2018, respectively. As of January 1, 2018, the Company adopted ASU 2016-01 (See Note 1) and reclassified $3,604 of other securities without readily determinable market values to other assets.

	December 31, 2017
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair Value
Investment Securities
Available-for-sale debt securities
U.S. government agency securities	$	999	$	—	$	(13	)	$	986
Mortgage-backed securities - residential		425,557		374		(7,150	)		418,781
Municipals, tax exempt		107,127		2,692		(568	)		109,251
Treasury securities		7,345		—		(93	)		7,252
Total debt securities		541,028		3,066		(7,824	)		536,270
Equity and other securities		7,870		1		(149	)		7,722
Total investment securities	$	548,898	$	3,067	$	(7,973	)	$	543,992

Securities pledged at June 30, 2018 and December 31, 2017 had a carrying amount of $433,780 and $337,604, 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 June 30, 2018 and December 31, 2017 are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgage underlying the security may be called or repaid without any penalties. Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary.

	June 30, 2018				December 31, 2017
	Available-for-sale				Available-for-sale
	Amortized cost		Fair value		Amortized cost		Fair value
Due in one year or less	$	11,991	$	12,195	$	905	$	925
Due in one to five years		20,026		20,083		28,332		28,878
Due in five to ten years		18,795		18,769		19,218		19,588
Due in over ten years		80,261		79,339		67,016		68,098
		131,073		130,386		115,471		117,489
Mortgage-backed securities - residential		494,599		477,974		425,557		418,781
Total debt securities	$	625,672	$	608,360	$	541,028	$	536,270

Sales of available-for-sale securities were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Proceeds from sales	$	—	$	12,158	$	221		12,158
Gross realized gains		—		77		—		77
Gross realized losses		—		48		9		48

The Company also recognized $1 in gains related to the early call of available for sale securities during the three months ended June 30, 2018 and six months ended June 30, 2017.

The following tables show gross unrealized losses at June 30, 2018 and December 31, 2017, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:

	June 30, 2018
	Less than 12 months				12 months or more				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized loss
U.S. government agency securities	$	—	$	—	$	983	$	16	$	983	$	16
Mortgage-backed securities - residential		185,980		4,472		261,675		12,322		447,655		16,794
Municipals, tax exempt		32,413		760		19,158		1,175		51,571		1,935
Treasury securities		7,156		208		—		—		7,156	$	208
Total debt securities	$	225,549	$	5,440	$	281,816	$	13,513	$	507,365	$	18,953

	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 and other securities		—		—		3,050		149		3,050		149
	$	122,217	$	1,174	$	314,406	$	6,799	$	436,623	$	7,973

As of June 30, 2018 and December 31, 2017, the Company’s securities portfolio consisted of 329 and 294 securities, 181 and 124 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 and recorded no OTTI for the three or six months ended June 30, 2018 and 2017. 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.

Loans and Allowance for Loan Losses

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Loans and allowance for loan losses

Note (4)—Loans and allowance for loan losses:

Loans outstanding at June 30, 2018 and December 31, 2017, by major lending classification are as follows:

	June 30,			December 31,
	2018			2017
Commercial and industrial	$	813,054		$	715,075
Construction		522,471			448,326
Residential real estate:
1-to-4 family mortgage		528,158			480,989
Residential line of credit		208,668			194,986
Multi-family mortgage		57,344			62,374
Commercial real estate:
Owner occupied		470,872			495,872
Non-owner occupied		600,629			551,588
Consumer and other		214,379			217,701
Gross loans		3,415,575			3,166,911
Less: Allowance for loan losses		(26,347	)		(24,041	)
Net loans	$	3,389,228		$	3,142,870

As of June 30, 2018 and December 31, 2017, $598,522 and $761,197, respectively, of qualifying residential mortgage loans (including loans held for sale) and $539,621 and $207,370, respectively, of qualifying commercial mortgage loans were pledged to the Federal Home Loan Bank of Cincinnati securing advances against the Bank’s line. As of June 30, 2018 and December 31, 2017, $1,218,505 and $724,312, respectively, of qualifying loans were pledged to the Federal Reserve Bank under the Borrower-in-Custody program.

As of June 30, 2018 and December 31, 2017, the carrying value of purchased credit impaired loans (“PCI”) loans accounted for under ASC 310-30 Loans and Debt Securities Acquired with Deteriorated Credit Quality, were $78,313 and $88,835, respectively. The following table presents changes in the value of the accretable yield for PCI loans for the periods indicated.

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Balance at beginning of period	$	(16,955	)	$	(2,142	)	$	(17,682	)	$	(2,444	)
Principal reductions/ pay-offs		(2,158	)		(292	)		(3,452	)		(990	)
Recoveries		—			—			—			(23	)
Accretion		2,639			589			4,840			1,612
Other changes		(3,695	)		—			(3,875	)		—
Balance at end of period	$	(20,169	)	$	(1,845	)	$	(20,169	)	$	(1,845	)

Included in the ending balance in the table above at June 30, 2018, are PCI loans with a purchase accounting liquidity discount of $4,212. There is also a purchase accounting nonaccretable credit discount of $5,236 related to the PCI loan portfolio at June 30, 2018 and an accretable credit and liquidity discount on non-PCI loans of $9,337 and $3,018, respectively.

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 $2,639 and $4,840 was recognized on purchased credit impaired loans during the three and six months ended June 30, 2018, respectively, compared with $589 and $1,612 for the three and six months ended June 30, 2017, 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 for all purchased loans was $1,928 and $3,615 for three and six months ended June 30, 2018, respectively, compared with $848 and $2,008 for the three and six months ended June 30, 2017.

The following provides the allowance for loan losses by portfolio segment and the related investment in loans net of unearned interest for the three and six months ended June 30, 2018 and 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
Three Months Ended June 30, 2018
Beginning balance - March 31, 2018	$	4,578		$	7,866		$	3,122		$	1,165		$	449		$	3,014		$	2,753	$	1,459		$	24,406
Provision for loan losses		39			310			218			(414	)		(58	)		168			519		281			1,063
Recoveries of loans previously charged-off		135			862			43			44			—			108			—		107			1,299
Loans charged off		(5	)		(15	)		(5	)		—			—			—			—		(396	)		(421	)
Ending balance - June 30, 2018	$	4,747		$	9,023		$	3,378		$	795		$	391		$	3,290		$	3,272	$	1,451		$	26,347
Six Months Ended June 30, 2018
Beginning balance - December 31, 2017	$	4,461		$	7,135		$	3,197		$	944		$	434		$	3,558		$	2,817	$	1,495		$	24,041
Provision for loan losses		241			789			188			(200	)		(43	)		(399	)		404		400			1,380
Recoveries of loans previously charged-off		270			1,114			58			71			—			131			51		313			2,008
Loans charged off		(225	)		(15	)		(65	)		(20	)		—			—			—		(757	)		(1,082	)
Ending balance - June 30, 2018	$	4,747		$	9,023		$	3,378		$	795		$	391		$	3,290		$	3,272	$	1,451		$	26,347

	Commercial and industrial			Construction			1-to-4 family residential mortgage			Residential line of credit			Multi- family residential mortgage		Commercial real estate owner occupied		Commercial real estate non-owner occupied			Consumer and other			Total
Three Months Ended June 30, 2017
Beginning balance - March 31, 2017	$	5,402		$	5,598		$	2,896		$	1,514		$	508	$	3,387	$	2,660		$	933		$	22,898
Provision for loan losses		(1,342	)		(48	)		99			(29	)		5		585		(210	)		75			(865	)
Recoveries of loans previously charged-off		1,511			29			14			155			—		11		2			283			2,005
Loans charged off		(131	)		—			(35	)		(195	)		—		—		—			(430	)		(791	)
Ending balance - June 30, 2017	$	5,440		$	5,579		$	2,974		$	1,445		$	513	$	3,983	$	2,452		$	861		$	23,247
Six Months Ended June 30, 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		(1,163	)		587			(140	)		(184	)		9		666		(1,208	)		311			(1,122	)
Recoveries of loans previously charged-off		1,594			58			40			211			—		15		1,641			296			3,855
Loans charged off		(300	)		(6	)		(123	)		(195	)		—		—		—			(609	)		(1,233	)
Ending balance - June 30, 2017	$	5,440		$	5,579		$	2,974		$	1,445		$	513	$	3,983	$	2,452		$	861		$	23,247

The following table provides the allocation of the allowance for loan losses by loan category broken out between loans individually evaluated for impairment, loans collectively evaluated for impairment and loans acquired with deteriorated credit quality as of June 30, 2018 and December 31, 2017:

													June 30, 2018
	Commercial and industrial		Construction		1-to-4 family residential mortgage		Residential line of credit		Multi- family residential mortgage		Commercial real estate owner occupied		Commercial real estate non-owner occupied		Consumer and other		Total
Amount of allowance allocated to:
Individually evaluated for impairment	$	49	$	—	$	12	$	—	$	—	$	124	$	—	$	—	$	185
Collectively evaluated for impairment		4,685		8,998		3,227		795		391		3,082		2,894		1,407		25,479
Acquired with deteriorated credit quality		13		25		139		—		—		84		378		44		683
Ending balance - June 30, 2018	$	4,747	$	9,023	$	3,378	$	795	$	391	$	3,290	$	3,272	$	1,451	$	26,347

													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

The following table provides the amount of loans by loan category broken between loans individually evaluated for impairment, loans collectively evaluated for impairment and loans acquired with deteriorated credit quality as of June 30, 2018 and December 31, 2017:

													June 30, 2018
	Commercial and industrial		Construction		1-to-4 family residential mortgage		Residential line of credit		Multi- family residential mortgage		Commercial real estate owner occupied		Commercial real estate non-owner occupied		Consumer and other		Total
Loans, net of unearned income
Individually evaluated for impairment	$	2,186	$	1,281	$	1,503	$	—	$	951	$	2,266	$	1,049	$	27	$	9,263
Collectively evaluated for impairment		809,102		514,129		505,643		208,668		56,377		460,281		581,531		192,268		3,327,999
Acquired with deteriorated credit quality		1,766		7,061		21,012		—		16		8,325		18,049		22,084		78,313
Ending balance - June 30, 2018	$	813,054	$	522,471	$	528,158	$	208,668	$	57,344	$	470,872	$	600,629	$	214,379	$	3,415,575

													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

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’s risk rating definitions include:

Watch. Loans rated as watch includes loans in which management believes conditions have occurred, or may occur, which could result in the loan being downgraded to a worse rated category. Also included in watch are loans rated as special mention, which have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date.

Substandard. Loans rated as substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so rated have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. Also included in this category are loans considered doubtful, which have all the weaknesses previously described and management believes those weaknesses may make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable.

Loans not meeting the criteria above are considered to be pass rated loans.

The following table shows credit quality indicators by portfolio class at June 30, 2018 and December 31, 2017:

June 30, 2018	Pass		Watch		Substandard		Total
Loans, excluding purchased credit impaired loans
Commercial and industrial	$	746,253	$	59,476	$	5,559	$	811,288
Construction		499,370		14,278		1,762		515,410
Residential real estate:
1-to-4 family mortgage		490,856		8,625		7,665		507,146
Residential line of credit		205,614		1,632		1,422		208,668
Multi-family mortgage		56,245		133		950		57,328
Commercial real estate:
Owner occupied		434,025		20,435		8,087		462,547
Non-owner occupied		565,195		16,096		1,289		582,580
Consumer and other		185,919		2,289		4,087		192,295
Total loans, excluding purchased credit impaired loans	$	3,183,477	$	122,964	$	30,821	$	3,337,262

Purchased credit impaired loans
Commercial and industrial	$	—	$	1,187	$	579	$	1,766
Construction		—		3,332		3,729		7,061
Residential real estate:
1-to-4 family mortgage		—		16,721		4,291		21,012
Residential line of credit		—		—		—		—
Multi-family mortgage		—		—		16		16
Commercial real estate:
Owner occupied		—		4,488		3,837		8,325
Non-owner occupied		—		7,465		10,584		18,049
Consumer and other		—		17,474		4,610		22,084
Total purchased credit impaired loans	$	—	$	50,667	$	27,646	$	78,313
Total loans	$	3,183,477	$	173,631	$	58,467	$	3,415,575

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

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 June 30, 2018 or December 31, 2017 as the carrying value of the respective loan or pool of loans cash flows were considered estimable and probable of collection.

Nonperforming loans include loans that are no longer accruing interest (non-accrual 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.

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, loans current on payments accruing interest and purchased credit impaired loans by category at June 30, 2018 and December 31, 2017:

June 30, 2018	30-89 days past due		90 days or more and accruing interest		Non-accrual loans		Loans current on payments and accruing interest		Purchased Credit Impaired loans		Total
Commercial and industrial	$	3,138	$	145	$	707	$	807,298	$	1,766	$	813,054
Construction		850		193		328		514,039		7,061		522,471
Residential real estate:
1-to-4 family mortgage		3,605		859		2,293		500,389		21,012		528,158
Residential line of credit		1,345		254		507		206,562		—		208,668
Multi-family mortgage		—		—		—		57,328		16		57,344
Commercial real estate:
Owner occupied		249		—		2,052		460,246		8,325		470,872
Non-owner occupied		—		—		1,212		581,368		18,049		600,629
Consumer and other		1,807		188		75		190,225		22,084		214,379
Total	$	10,994	$	1,639	$	7,174	$	3,317,455	$	78,313	$	3,415,575

December 31, 2017	30-89 days past due		90 days or more and accruing interest		Non-accrual loans		Loans current on payments and accruing interest		Purchased Credit Impaired loans		Total
Commercial and industrial	$	5,859	$	90	$	533	$	706,449	$	2,144	$	715,075
Construction		1,412		241		300		438,645		7,728		448,326
Residential real estate:
1-to-4 family mortgage		4,678		956		2,548		449,309		23,498		480,989
Residential line of credit		527		134		699		193,626		—		194,986
Multi-family mortgage		—		—		—		62,354		20		62,374
Commercial real estate:
Owner occupied		521		358		2,582		480,449		11,962		495,872
Non-owner occupied		121		—		1,371		531,932		18,164		551,588
Consumer and other		1,945		217		68		190,152		25,319		217,701
Total	$	15,063	$	1,996	$	8,101	$	3,052,916	$	88,835	$	3,166,911

Impaired loans recognized in conformity with ASC 310-20 at June 30, 2018 and December 31, 2017, segregated by class, were as follows:

June 30, 2018	Recorded investment		Unpaid principal		Related allowance
With a related allowance recorded:
Commercial and industrial	$	153	$	153	$	49
Residential real estate:
1-to-4 family mortgage		187		488		12
Commercial real estate:
Owner occupied		754		819		124
Total	$	1,094	$	1,460	$	185
With no related allowance recorded:
Commercial and industrial	$	2,033	$	2,387	$	—
Construction		1,281		1,314		—
Residential real estate:
1-to-4 family mortgage		1,316		1,322		—
Multi-family mortgage		951		951		—
Commercial real estate:
Owner occupied		1,512		2,039		—
Non-owner occupied		1,049		1,781		—
Consumer and other		27		27		—
Total	$	8,169	$	9,821	$	—
Total impaired loans	$	9,263	$	11,281	$	185

December 31, 2017	Recorded investment		Unpaid principal		Related allowance
With a related allowance recorded:
Commercial and industrial	$	53	$	53	$	20
Residential real estate:
1-to-4 family mortgage		194		495		18
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		—
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

Average recorded investment and interest income on a cash basis recognized during the three and six months ended June 30, 2018 and 2017 on impaired loans, segregated by class, were as follows:

	Three Months Ended				Six Months Ended
June 30, 2018	Average recorded investment		Interest income recognized (cash basis)		Average recorded investment		Interest income recognized (cash basis)
With a related allowance recorded:
Commercial and industrial	$	103	$	2	$	103	$	3
Residential real estate:
1-to-4 family mortgage		189		2		191		4
Commercial real estate:
Owner occupied		670		21		799		27
Non-owner occupied		71		—		72		2
Total	$	1,033	$	25	$	1,165	$	36
With no related allowance recorded:
Commercial and industrial	$	1,683	$	43	$	1,780	$	59
Construction		1,283		6		1,285		36
Residential real estate:
1-to-4 family mortgage		1,309		31		1,192		44
Multi-family mortgage		958		12		965		24
Commercial real estate:
Owner occupied		1,539		28		1,594		60
Non-owner occupied		1,310		—		1,313		7
Consumer and other		28		1		26		1
Total	$	8,110	$	121	$	8,155	$	231
Total impaired loans	$	9,143	$	146	$	9,320	$	267
June 30, 2017
With a related allowance recorded:
Commercial and industrial	$	729	$	5	$	792	$	10
Residential real estate:
1-to-4 family mortgage		98		—		100		—
Commercial real estate:
Owner occupied		616		8		622		20
Non-owner occupied		514		2		829		2
Consumer and other		—		—		1		—
Total	$	1,957	$	15	$	2,344	$	32
With no related allowance recorded:
Commercial and industrial	$	519	$	7	$	557	$	16
Construction		302		4		1,493		9
Residential real estate:
1-to-4 family mortgage		2,106		15		2,232		32
Residential line of credit		—		—		156		—
Multi-family mortgage		1,008		12		1,014		23
Commercial real estate:
Owner occupied		1,801		23		1,941		61
Non-owner occupied		1,602		5		1,323		5
Consumer and other		25		—		25		1
Total	$	7,363	$	66	$	8,741	$	147
Total impaired loans	$	9,320	$	81	$	11,085	$	179

As of June 30, 2018 and December 31, 2017, the Company has a recorded investment in troubled debt restructurings of $8,603 and $8,604, respectively. The modifications included extensions of the maturity date and/or a stated rate of interest to one lower than the current market rate. The Company has allocated $90 and $172 of specific reserves for those loans at June 30, 2018 and December 31, 2017, respectively, and has committed to lend additional amounts totaling up to $4 and $2, respectively to these customers. Of these loans, $3,000 and $3,205 were classified as non-accrual loans as of June 30, 2018 and December 31, 2017, respectively.

The following tables present the financial effect of TDRs recorded during the periods indicated:

Three Months Ended June 30, 2018	Number of loans		Pre-modification outstanding recorded investment		Post-modification outstanding recorded investment		Charge offs and specific reserves
Commercial and industrial		2	$	887	$	887	$	—
Total		2	$	887	$	887	$	—

Six Months Ended June 30, 2018	Number of loans	Pre-modification outstanding recorded investment		Post-modification outstanding recorded investment		Charge offs and specific reserves
Commercial and industrial	2	$	887	$	887	$	—
Residential real estate:
1-to-4 family mortgage	1		249		249		—
Consumer and other	1		5		5		—
Total	4	$	1,141	$	1,141	$	—

Six Months Ended June 30, 2017	Number of loans	Pre-modification outstanding recorded investment		Post-modification outstanding recorded investment		Charge offs and specific reserves
Commercial and industrial	1	$	5	$	5	$	—
Commercial real estate:
Owner occupied	1		377		377		—
Non-owner occupied	2		711		711		—
Total	4	$	1,093	$	1,093	$	—

There were no TDRs recorded during the three months ended June 30, 2017. Additionally, there were no loans modified as troubled debt restructurings for which there was a payment default within twelve months following the modification during the six months ended June 30, 2018 or 2017.

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 six months ended June 30, 2018 and 2017 that did not meet the definition of a troubled debt restructuring. The modification of these loans involved either a modification of the terms of a loan to borrowers who were not experiencing financial difficulties or a delay in a payment that was considered to be insignificant.

In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification. This evaluation is performed under the company’s internal underwriting policy.

Other Real Estate Owned

6 Months Ended

Jun. 30, 2018

Real Estate [Abstract]

Other Real Estate Owned

Note (5)—Other real estate owned:

The amount reported as other real estate owned includes property acquired through foreclosure in addition to excess facilities held for sale and is carried at fair value less estimated cost to sell the property. The following table summarizes other real estate owned for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Balance at beginning of period	$	15,334		$	6,811		$	16,442		$	7,403
Transfers from loans		384			274			1,014			1,162
Properties sold		(777	)		(702	)		(2,209	)		(2,930	)
(Loss) gain on sale of other real estate owned		51			77			8			948
Transferred to loans		(325	)		(36	)		(445	)		(36	)
Write-downs		(28	)		(54	)		(171	)		(177	)
Balance at end of period	$	14,639		$	6,370		$	14,639		$	6,370

Foreclosed residential real estate properties totaled $3,320 and $3,631 as of June 30, 2018 and December 31, 2017, respectively. The recorded investment in residential mortgage loans secured by residential real estate properties for which foreclosure proceedings are in process totaled $634 and $19 at June 30, 2018 and December 31, 2017, respectively.

- Definition

The entire disclosure for real estate owned (as defined). Generally, the largest component of real estate owned by lenders is assets taken in settlement of troubled loans through surrender or foreclosure. Real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84176060&loc=d3e18551-111553

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 40
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84176060&loc=d3e18511-111553

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4437-111522

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=29634951&loc=d3e1424-110224

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04(c)(Schedule III))
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 970
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28)
-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 43
-URI http://asc.fasb.org/extlink&oid=29634951&loc=d3e1739-110224

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(8))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Mortgage Servicing Rights

6 Months Ended

Jun. 30, 2018

Transfers And Servicing Of Financial Assets [Abstract]

Mortgage servicing rights

Note (6)—Mortgage servicing rights:

Changes in the Company’s mortgage servicing rights were as follows for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended June 30,						Six Months Ended June 30,
		2018			2017			2018			2017
Carrying value prior to policy change	$	93,160		$	47,593		$	76,107		$	32,070
Fair value impact of change in accounting policy		—			—			—			1,011
Carrying value at beginning of period		93,160			47,593			76,107			33,081
Capitalization		16,304			14,646			29,814			29,659
Sales		—			(11,935	)		—			(11,935	)
Change in fair value:
Due to pay-offs/pay-downs		(2,207	)		(532	)		(5,267	)		(797	)
Due to change in valuation inputs or assumptions		2,192			(1,308	)		8,795			(1,544	)
Carrying value at end of period	$	109,449		$	48,464		$	109,449		$	48,464

The following table summarizes servicing income and expense included in mortgage banking income and other noninterest expense within the Mortgage Segment operating results, respectively, for the three and six months ended June 30, 2018 and 2017, respectively:

	Three Months Ended June 30,						Six Months Ended June 30,
		2018			2017			2018			2017
Servicing income:
Servicing income	$	5,604		$	2,747		$	10,397		$	5,495
Change in fair value of mortgage servicing rights		(15	)		(1,840	)		3,528			(2,341	)
Change in fair value of mortgage servicing rights hedging instruments		(1,763	)		—			(7,019	)		—
Gross servicing income		3,826			907			6,906			3,154
Servicing expense:
Loss on sale of mortgage servicing rights		—			249			—			249
Direct servicing expenses		2,078			1,204			3,873			2,138
Gross servicing expense		2,078			1,453			3,873			2,387
Net servicing income	$	1,748		$	(546	)	$	3,033		$	767

Data and key economic assumptions related to the Company’s mortgage servicing rights as of June 30, 2018 and December 31, 2017 are as follows:

	June 30,			December 31,
		2018			2017
Unpaid principal balance	$	8,483,445		$	6,529,431
Weighted-average prepayment speed (CPR)		7.63	%		8.90	%
Estimated impact on fair value of a 10% increase		(3,588	)		(3,026	)
Estimated impact on fair value of a 20% increase		(6,921	)		(5,855	)
Discount rate		10.23	%		9.75	%
Estimated impact on fair value of a 100 bp increase		(4,578	)		(3,052	)
Estimated impact on fair value of a 200 bp increase		(8,813	)		(5,867	)
Weighted-average coupon interest rate		4.06	%		3.94	%
Weighted-average servicing fee (basis points)		28			28
Weighted-average remaining maturity (in months)		331			335

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 second quarter of 2018, the Company entered into a letter of intent for the sale of certain mortgage servicing rights on $3,217,580 of serviced mortgage loans, of which the Company will continue to subservice until they can be transferred to the purchaser. The transaction is expected to close during the third quarter of 2018 and the Company does not expect there to be a significant gain or loss related to this transaction. During the three months ended June 30, 2017, the Company sold $11,935 of mortgage servicing rights on $1,085,465 of serviced mortgage loans. As of June 30, 2018 and December 31, 2017, there were no loans being serviced that related to the sale of mortgage servicing rights.

Income Taxes

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Note (7)—Income taxes:

Allocation of federal and state income taxes between current and deferred portions is as follows:

	For the three months ended
	June 30,
	2018		2017
Current	$	2,195	$	4,047
Deferred		5,599		2,527
Total	$	7,794	$	6,574

	For the six months ended
			June 30,
	2018		2017
Current	$	2,195	$	4,047
Deferred		11,081		7,952
Total	$	13,276	$	11,999

Federal income tax expense differs from the statutory federal rates of 21% for the three and six months ended June 30, 2018 and 35% for the three and six months ended June 30, 2017 due to the following:

	For the Three Months Ended
									June 30,
	2018					2017
Federal taxes calculated at statutory rate	$	6,270		21.0	%	$	6,234			35.0	%
Increase (decrease) resulting from:
State taxes, net of federal benefit		1,543		5.2	%		741			4.2	%
Benefit of equity based compensation		(15	)	-0.1	%		20			0.1	%
Municipal interest income, net of interest disallowance		(207	)	-0.7	%		(376	)		-2.1	%
Bank owned life insurance		(13	)	0.0	%		(21	)		-0.1	%
Stock offering costs		141		0.5	%		—			0.0	%
Other		75		0.2	%		(24	)		-0.2	%
Income tax expense, as reported	$	7,794		26.1	%	$	6,574			36.9	%

	For the Six Months Ended
									June 30,
	2018					2017
Federal taxes calculated at statutory rate	$	11,570		21.0	%	$	11,539			35.0	%
Increase (decrease) resulting from:
State taxes, net of federal benefit		2,686		4.9	%		1,351			4.1	%
Benefit of equity based compensation		(751	)	-1.4	%		(175	)		-0.5	%
Municipal interest income, net of interest disallowance		(408	)	-0.7	%		(742	)		-2.3	%
Bank owned life insurance		(25	)	0.0	%		(42	)		-0.1	%
Stock offering costs		141		0.3	%		—			0.0	%
Other		63		0.0	%		68			0.2	%
Income tax expense, as reported	$	13,276		24.1	%	$	11,999			36.4	%

The components of the net deferred tax liability at June 30, 2018 and December 31, 2017, are as follows:

	June 30,			December 31,
	2018			2017
Deferred tax assets:
Allowance for loan losses	$	6,865		$	6,264
Amortization of core deposit intangible		898			759
Deferred compensation		4,448			6,158
Unrealized loss on available-for-sale debt securities		4,563			988
Other		3,222			3,599
Subtotal		19,996			17,768
Deferred tax liabilities:
FHLB stock dividends		(550	)		(550	)
Depreciation		(4,322	)		(4,115	)
Cash flow hedges		(930	)		—
Mortgage servicing rights		(28,518	)		(19,830	)
Other		(5,969	)		(5,131	)
Subtotal		(40,289	)		(29,626	)
Net deferred tax liability	$	(20,293	)	$	(11,858	)

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.

Commitments and Contingencies

6 Months Ended

Jun. 30, 2018

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note (8)—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.

	June 30,		December 31,
	2018		2017
Commitments to extend credit, excluding interest rate lock commitments	$	1,088,486	$	977,276
Letters of credit		18,555		22,882
Balance at end of period	$	1,107,041	$	1,000,158

In connection with the sale of mortgage loans to third party investors, the Bank makes usual and customary representations and warranties as to the propriety of its origination activities. Occasionally, the investors require the Bank to repurchase loans sold to them under the terms of the warranties. When this happens, the loans are recorded at fair value with a corresponding charge to a valuation reserve. The total principal amount of loans repurchased (or indemnified for) was $1,543 and $921 and $2,662 and $1,770 for the three and six months ended June 30, 2018 and 2017, 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 three months ended						For the six months ended
	June 30,						June 30,
	2018			2017			2018			2017
Balance at beginning of period	$	3,514		$	2,842		$	3,386		$	2,659
Provision for loan repurchases or indemnifications		206			201			392			384
Losses on loans repurchased or indemnified		(74	)		(6	)		(132	)		(6	)
Balance at end of period	$	3,646		$	3,037		$	3,646		$	3,037

Derivatives

6 Months Ended

Jun. 30, 2018

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivatives

Note (9)—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 forty-five days with the customer. These interest rate lock commitments are recorded at fair value in the Company’s Consolidated Balance Sheets. The Company also enters into best effort or mandatory delivery forward commitments to sell residential mortgage loans to secondary market investors. Gains and losses arising from changes in the valuation of the rate-lock commitments and forward commitments are recognized currently in earnings and are reflected under the line item “Mortgage banking income” on the Consolidated Statements of Income.

The Company enters into forward commitments, futures and options contracts that are not designated as hedging instruments as economic hedges 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. 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 June 30, 2018 and December 31, 2017, the fair value of these contracts was $1,296 and $305, respectively.

In July of 2017, the Company entered into three interest rate swap contracts on floating rate liabilities at the Bank level with notional amounts of $30,000, $35,000 and $35,000 for a period of three, four and five years, respectively. These interest rate swaps were designated as cash flow hedges with the objective of reducing the variability of cash flows associated with $100,000 of FHLB borrowings obtained in conjunction with the Clayton Bank acquisition. Under these contracts, the Company receives a variable rate of interest and pays a fixed rate of interest. As of December 31, 2017, the fair value of these contracts was $1,127 included in those designated as hedging below. During the six months ended June 30, 2018, these swaps were cancelled, locking in a tax-adjusted gain of $1,564 in other comprehensive income to be accreted over the three, four and five-year terms of the underlying contracts. As of June 30, 2018, there was $1,559 remaining in other comprehensive income to be accreted into income.

Certain financial instruments, including derivatives, may be eligible for offset in the Consolidated Balance Sheet when the “right of setoff” exists or when the instruments are subject to an enforceable master netting agreement, which includes the right of the non-defaulting party or non-affected party to offset recognized amounts, including collateral posted with the counterparty, to determine a net receivable or net payable upon early termination of the agreement. Certain of the Company’s derivative instruments are subject to master netting agreements. The Company has not elected to offset such financial instruments in the Consolidated Balance Sheets.

Most derivative contracts with clients are secured by collateral. Additionally, in accordance with the interest rate agreements with derivatives dealers, the Company may be required to post margin to these counterparties. At June 30, 2018 and December 31, 2017, the Company had minimum collateral posting thresholds with certain of its derivative counterparties and posted collateral of $10,896 and $4,309, respectively, against its obligations under these agreements. Cash collateral related to derivative contracts is recorded in other assets in the consolidated balance sheets.

The following tables provide details on the Company’s derivative financial instruments as of the dates presented:

	June 30, 2018
	Notional Amount		Asset		Liability
Not designated as hedging:
Interest rate contracts	$	231,899	$	3,798	$	3,798
Forward commitments		717,330		—		1,682
Interest rate-lock commitments		597,569		9,495		—
Futures contracts		231,000		445		—
Option contracts		12,000		83		—
Total	$	1,789,798	$	13,821	$	5,480

	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

	June 30, 2018
	Notional Amount		Asset		Liability
Designated as hedging:
Interest rate swaps	$	30,000	$	1,296	$	—
Total	$	30,000	$	1,296	$	—

	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:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Not designated as hedging instruments (included in mortgage banking income):
Interest rate lock commitments	$	(684	)	$	(1,433	)	$	2,727		$	1,509
Forward commitments		635			(3,928	)		5,953			(7,248	)
Futures contracts		(1,369	)		—			(3,816	)		—
Options contracts		(38	)		—			5			—
Total	$	(1,456	)	$	(5,361	)	$	4,869		$	(5,739	)

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018			2017
Designated as hedging:
Amount of gain (loss) reclassified from other comprehensive income and recognized in interest expense on long-term debt	$	25		—	$	(7	)		—

The following table discloses the amount included in other comprehensive income (loss), net of tax, for derivative instruments designated as cash flow hedges for the periods presented:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Designated as hedging:
Amount of gain recognized in other comprehensive income, net of tax	$	196		—	$	1,469		—

Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair value of financial instruments

Note (10)—Fair value of financial instruments:

FASB ASC 820-10 defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. ASC 820-10 also establishes a framework for measuring the fair value of assets and liabilities according to a hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets and liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The hierarchy maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that are derived from assumptions based on management’s estimate of assumptions that market participants would use in pricing the asset or liability based on the best information available under the circumstances.

The hierarchy is broken down into the following three levels, based on the reliability of inputs:

Level 1: Unadjusted quoted prices in active markets for identical assets or liabilities that are accessible at the measurement date.

Level 2: Significant other observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data.

Level 3: Significant unobservable inputs for assets or liabilities that are derived from assumptions based on management’s estimate of assumptions that market participants would use in pricing the assets or liabilities.

The Company records the fair values of financial assets and liabilities on a recurring and non-recurring basis using the following methods and assumptions:

During the first quarter of 2018, the Company adopted ASU 2016-01, “Recognition and Measurement of Financial Assets and Liabilities.” The amendments included within this standard, which are applied prospectively, require the Company to disclose fair value of financial instruments measured at amortized cost on the balance sheet to measure the fair value using an exit price notion. Prior to adopting the amendments included in the standard, the Company measured fair value under an entry price notion.

Investment securities—Investment securities are recorded at fair value on a recurring basis. Fair values for securities are based on quoted market prices, where available. If quoted prices are not available, fair values are based on quoted market prices of similar instruments or are determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the pricing relationship or correlation among other benchmark quoted securities. Investment securities valued using quoted market prices of similar instruments or that are valued using matrix pricing are classified as Level 2. When significant inputs to the valuation are unobservable, the available-for-sale securities are classified within Level 3 of the fair value hierarchy.

Where no active market exists for a security or other benchmark securities, fair value is estimated by the Company with reference to discount margins for other high risk securities.

Loans held for sale—Loans held for sale are carried at fair value. Fair value is determined using current secondary market prices for loans with similar characteristics, that is, using Level 2 inputs.

Derivatives—The fair value of the interest rate swaps are based upon fair values provided from entities that engage in interest rate swap activity and is based upon projected future cash flows and interest rates. Fair value of commitments is based on fees currently charged to enter into similar agreements, and for fixed-rate commitments, the difference between current levels of interest rates and the committed rates is also considered. These financial instruments are classified as Level 2.

Other real estate owned—Other real estate owned (“OREO”) is comprised of commercial and residential real estate obtained in partial or total satisfaction of loan obligations and excess land and facilities held for sale. OREO acquired in settlement of indebtedness is recorded at the lower of the carrying amount of the loan or the fair value of the real estate less costs to sell. Fair value is determined on a nonrecurring basis based on appraisals by qualified licensed appraisers and is adjusted for management’s estimates of costs to sell and holding period discounts. The valuations are classified as Level 3.

Mortgage servicing rights—Servicing rights are carried at fair value. Fair value is determined using an income approach with various assumptions including expected cash flows, market discount rates, prepayment speeds, servicing costs, and other factors. 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 table contains the estimated fair values and the related carrying values of the Company's financial instruments. Items which are not financial instruments are not included. Due to the adoption of ASU 2016-01 as of January 1, 2018, the fair value as presented below is measured using the exit price notion in the periods after adoption and may not be comparable with prior periods presented as a result of the change in methodology.

			Fair Value
June 30, 2018	Carrying amount		Level 1		Level 2		Level 3		Total
Financial assets:
Cash and cash equivalents	$	104,417	$	104,417	$	—	$	—	$	104,417
Investment securities		611,435		—		611,435		—		611,435
Federal Home Loan Bank Stock		12,641	N/A		N/A		N/A		N/A
Loans, net		3,389,228		—		—		3,384,932		3,384,932
Loans held for sale		374,916		—		374,916		—		374,916
Interest receivable		12,729		—		12,729		—		12,729
Mortgage servicing rights		109,449		—		—		109,449		109,449
Derivatives		15,117		—		15,117		—		15,117
Financial liabilities:
Deposits:
Without stated maturities	$	3,179,754	$	3,179,754	$	—	$	—	$	3,179,754
With stated maturities		730,109		—		731,029		—		731,029
Securities sold under agreement to repurchase		15,996		15,996		—		—		15,996
Short term borrowings		187,522		187,522		—		—		187,522
Interest payable		2,180		631		1,549		—		2,180
Long-term debt		139,375		—		138,578		—		138,578
Derivatives		5,480		—		5,480		—		5,480

			Fair Value
December 31, 2017	Carrying amount		Level 1		Level 2		Level 3		Total
Financial assets:
Cash and cash equivalents	$	119,751	$	119,751	$	—	$	—	$	119,751
Investment securities		543,992		—		540,388		3,604		543,992
Federal Home Loan Bank Stock		11,412	N/A		N/A		N/A		N/A
Loans, net		3,142,870		—		3,064,373		77,027		3,141,400
Loans held for sale		526,185		—		526,185		—		526,185
Interest receivable		13,069		—		13,069		—		13,069
Mortgage servicing rights, net		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

The balances and levels of the assets measured at fair value on a recurring basis at June 30, 2018 are presented in the following tables:

At June 30, 2018	Quoted prices in active markets for identical assets (liabilities) (level 1)		Significant other observable inputs (level 2)		Significant unobservable inputs (level 3)		Total
Recurring valuations:
Financial assets:
Investment securities:
U.S. government agency securities	$	—	$	983	$	—	$	983
Mortgage-backed securities		—		477,974		—		477,974
Municipals, tax-exempt		—		122,247		—		122,247
Treasury securities		—		7,156		—		7,156
Equity securities		—		3,075		—		3,075
Total	$	—	$	611,435	$	—	$	611,435
Loans held for sale		—		374,916		—		374,916
Mortgage servicing rights		—		—		109,449		109,449
Derivatives		—		15,117		—		15,117
Financial Liabilities:
Derivatives	$	—	$	5,480	$	—	$	5,480

The balances and levels of the assets measured at fair value on a non-recurring basis at June 30, 2018 are presented in the following tables:

At June 30, 2018	Quoted prices in active markets for identical assets (liabilities) (level 1)		Significant other observable inputs (level 2)		Significant unobservable inputs (level 3)		Total
Non-recurring valuations:
Financial assets:
Other real estate owned	$	—	$	—	$	798	$	798
Impaired loans:
Commercial and industrial		—		—		107		107
Construction
Residential real estate:
1-4 family mortgage		—		—		144		144
Commercial real estate:		—		—		—		—
Owner occupied		—		—		180		180
Non-owner occupied		—		—		—		—
Consumer and other		—		—		—		—
Total	$	—	$	—	$	431	$	431

The balances and levels of the assets measured at fair value on a recurring basis at December 31, 2017 are presented in the following tables:

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 tables:

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

There were no transfers between Level 1, 2 or 3 during the periods presented.

The following table summarizes changes in fair value on available-for-sale securities measured at fair value on a recurring basis using significant unobservable inputs, or Level 3 inputs, during the three and six months ended June 30, 2018 and 2017.

					Available-for-sale securities
	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018			2017
Balance at beginning of period	$	—	$	4,549	$	3,604		$	4,549
Reclassification of equity securities without a readily determinable fair value to other assets⁽¹⁾		—		—		(3,604	)		—
Balance at end of period	$	—	$	4,549	$	—		$	4,549

(1)	See Note 1, “Basis of Presentation” in the Notes to the consolidated financial statements for additional details regarding the adoption of ASU 2016-01, Recognition and Measurement of Financial Assets and Liabilities.

As of December 31, 2017, there was no established market for certain other securities, and as such, the Company had estimated that historical costs approximated market value. As of January 1, 2018, the Company adopted ASU 2016-01 (See Note 1) and reclassified $3,604 of these other securities without readily determinable market values to other assets.

The following table presents information as of June 30, 2018 about significant unobservable inputs (Level 3) used in the valuation of assets measured at fair value on a nonrecurring basis:

Financial instrument

Fair Value

Valuation technique

Significant Unobservable inputs

Range of

inputs

Impaired loans

$

431

Valuation of collateral

Discount for comparable sales

0%-30%

Other real estate owned

$

798

Appraised value of property less costs to sell

Discount for costs to sell

0%-15%

The following table presents information as of December 31, 2017 about significant unobservable inputs (Level 3) used in the valuation of assets measured at fair value on a nonrecurring basis:

Financial instrument

Fair Value

Valuation technique

Significant Unobservable inputs

Range of

inputs

Impaired loans

$

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%

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 gains of $2,076 and $4,197 and $1,864 and $9,470 and resulting from fair value changes of the mortgage loans were recorded in income during the three and six months ended June 30, 2018 and 2017, respectively. The amount does not reflect changes in fair values of related derivative instruments used to hedge exposure to market-related risks associated with these mortgage loans. The change in fair value of both loans held for sale and the related derivative instruments are recorded in Mortgage Banking Income in the Consolidated Statements of Income. Election of the fair value option allows the Company to reduce the accounting volatility that would otherwise result from the asymmetry created by accounting for the financial instruments at the lower of cost or fair value and the derivatives at fair value. The fair value option election does not apply to the GNMA optional repurchase loans recorded as of December 31, 2017 which do not meet the requirements under FASB ASC Topic 825 to be accounted for under the fair value option. At June 30, 2018, there were $52,212 of delinquent GNMA loans that had previously been sold. The Company determined there not to be a more-than-trivial benefit based on an analysis of interest rates and an assessment of potential reputational risk associated with these loans. As such, the Company had $0 in rebooked GNMA loans included in loans held for sale as of June 30, 2018. GNMA optional repurchase loans totaled $43,035 at December 31, 2017 and are included in loans held for sale on the accompanying Consolidated Balance Sheet. See Note 1, “Basis of presentation” in the Notes to the consolidated financial statements for additional details regarding rebooked GNMA loans.

The Company’s valuation of loans held for sale incorporates an assumption for credit risk; however, given the short-term period that the Company holds these loans, valuation adjustments attributable to instrument-specific credit risk is nominal. Interest income on loans held for sale measured at fair value is accrued as it is earned based on contractual rates and is reflected in loan interest income in the Consolidated Statements of Income.

The following table summarizes the differences between the fair value and the principal balance for loans held for sale measured at fair value as of June 30, 2018 and December 31, 2017:

June 30, 2018	Aggregate fair value		Aggregate Unpaid Principal Balance		Difference
Mortgage loans held for sale measured at fair value	$	374,916	$	364,063	$	10,853
Past due loans of 90 days or more		—		—		—
Nonaccrual loans		—		—		—

December 31, 2017
Mortgage loans held for sale measured at fair value	$	482,089	$	467,039	$	15,050
Past due loans of 90 days or more		320		320		—
Nonaccrual loans		741		741		—

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Segment Reporting

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Segment Reporting

Note (11)—Segment reporting:

The Company and the Bank are engaged in the business of banking and provide a full range of financial services. The Company determines reportable segments based on the significance of the segment’s operating results to the overall Company, the products and services offered, customer characteristics, processes and service delivery of the segments and the regular financial performance review and allocation of resources by the Chief Executive Officer (“CEO”), the Company’s chief operating decision maker. The Company has identified two distinct reportable segments—Banking and Mortgage. The Company’s primary segment is Banking, which provides a full range of deposit and lending products and services to corporate, commercial and consumer customers. The Company offers full-service conforming residential mortgage products, including conforming residential loans and services through the Mortgage segment utilizing mortgage offices outside of the geographic footprint of the Banking operations as well as internet and correspondent delivery channels. Additionally, the Mortgage Segment includes the servicing of residential retail 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.

The following tables provides segment financial information for the three and six months ended June 30, 2018 and 2017 follows:

Three Months Ended June 30, 2018	Banking		Mortgage			Consolidated
Net interest income	$	51,669	$	(152	)	$	51,517
Provision for loan loss		1,063		—			1,063
Mortgage banking income		6,894		23,428			30,322
Change in fair value of mortgage servicing rights⁽¹⁾		—		(1,778	)		(1,778	)
Other noninterest income		7,164		—			7,164
Depreciation		990		142			1,132
Amortization of intangibles		802		—			802
Other noninterest mortgage banking expense		5,649		19,440			25,089
Other noninterest expense		29,280		—			29,280
Income before income taxes		27,943		1,916			29,859
Income tax expense							7,794
Net income							22,065
Total assets	$	4,443,469	$	479,780		$	4,923,249
Goodwill		137,090		100			137,190
(1)Included in mortgage banking income, net of hedging gains/losses, on the Consolidated Unaudited Statements of Income.

Three Months Ended June 30, 2017	Banking			Mortgage			Consolidated
Net interest income	$	29,999		$	428		$	30,427
Provision for loan loss		(865	)		—			(865	)
Mortgage banking income		7,118			24,961			32,079
Change in fair value of mortgage servicing rights⁽¹⁾		—			(1,840	)		(1,840	)
Other noninterest income		5,418			—			5,418
Depreciation		861			130			991
Amortization of intangibles		123			—			123
Loss on sale of mortgage servicing rights		—			249			249
Other noninterest mortgage banking expense		5,368			19,423			24,791
Other noninterest expense⁽²⁾		22,982			—			22,982
Income before income taxes		14,066			3,747			17,813
Income tax expense								6,574
Net income								11,239
Total assets	$	2,878,437		$	468,133		$	3,346,570
Goodwill		46,767			100			46,867

(1)	Included in mortgage banking income on the Consolidated Unaudited Statements of Income.

(2)	Included $767 in merger and conversion expenses related to the merger with the Clayton Banks.

Six Months Ended June 30, 2018	Banking		Mortgage			Consolidated
Net interest income	$	100,440	$	(494	)	$	99,946
Provision for loan loss		1,380		—			1,380
Mortgage banking income		13,002		45,504			58,506
Net, change in fair value of mortgage servicing rights⁽¹⁾		—		(3,491	)		(3,491	)
Other noninterest income		13,968		—			13,968
Depreciation		1,968		270			2,238
Amortization of intangibles		1,655		—			1,655
Other noninterest mortgage banking expense		10,746		38,222			48,968
Other noninterest expense⁽²⁾		59,593		—			59,593
Income before income taxes		52,068		3,027			55,095
Income tax expense							13,276
Net income							41,819
Total assets	$	4,443,469	$	479,780		$	4,923,249
Goodwill		137,090		100			137,190

(1)	Included in mortgage banking income on the Consolidated Unaudited Statements of Income.

(2)	Included $1,193 in merger and conversion expenses related to the merger with the Clayton Banks.

Six Months Ended June 30, 2017	Banking			Mortgage			Consolidated
Net interest income	$	59,855		$	823		$	60,678
Provision for loan loss		(1,122	)		—			(1,122	)
Mortgage banking income		12,784			44,876			57,660
Net, change in fair value of mortgage servicing rights⁽¹⁾		—			(2,341	)		(2,341	)
Other noninterest income		11,425			—			11,425
Depreciation and amortization		1,725			268			1,993
Amortization of intangibles		515			—			515
Loss on sale of mortgage servicing rights		—			249			249
Other noninterest mortgage banking expense		10,204			36,955			47,159
Other noninterest expense⁽²⁾		45,637			—			45,637
Income before income taxes		27,105			5,886			32,991
Income tax expense								11,999
Net income								20,992
Total assets	$	2,878,437		$	468,133		$	3,346,570
Goodwill		46,767			100			46,867

(1)	Included in mortgage banking income, net of hedging gains/losses, on the Consolidated Unaudited Statements of Income.

(2)	Included $1,254 in merger and conversion expenses related to the merger with the Clayton Banks.

Our Banking segment provides our Mortgage segment with an intercompany warehouse line of credit that is used to fund mortgage loans held for sale. The warehouse line of credit, which eliminated in consolidation, had a prime interest rate of 5.00% and 4.25% as of June 30, 2018 and 2017, 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 $4,517 and $3,831 and $9,025 and $7,382 for the three and six months ended June 30, 2018 and 2017, respectively.

For more information regarding the Company’s segment reporting, see “Business segment highlights” and Note 21 “Segment reporting” in the notes to the consolidated financial statements in the Company’s Form 10-K filed with SEC on March 16, 2018.

Minimum Capital Requirements

6 Months Ended

Jun. 30, 2018

Banking And Thrift [Abstract]

Minimum capital requirements

Note (12)—Minimum capital requirements:

Banks and bank holding companies are subject to regulatory capital requirements administered by federal banking agencies. Capital adequacy guidelines and, additionally for banks, prompt corrective action regulations involve quantitative measures of assets, liabilities, and certain off-balance sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators. Failure to meet capital requirements can initiate regulatory action.

Under regulatory guidance for non-advanced approaches institutions, the Bank is required to maintain minimum amounts and ratios of common equity Tier I capital to risk-weighted assets. Additionally, under Basel III rules, the decision was made to opt-out of including accumulated other comprehensive income in regulatory capital. As of June 30, 2018 and December 31, 2017, the Bank and Company met all capital adequacy requirements to which it is subject. Also, as of June 30, 2018, the most recent notification from the Federal Deposit Insurance Corporation (“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.

Beginning in 2016, an additional conservation buffer was added to the minimum requirements for capital adequacy purposes, subject to a three year phase-in period. As of June 30, 2018 and December 31, 2017, the buffer was 1.75 percent and 1.25 percent, respectively. 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 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
June 30, 2018
Total Capital (to risk-weighted assets)
FB Financial Corporation	$	524,655		11.9	%	$	352,709		8.0	%	$	435,375		9.9	%	N/A		N/A
FirstBank		497,123		11.3	%		351,945		8.0	%		434,433		9.9	%	$	439,932		10.0	%
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation	$	498,308		11.3	%	$	264,588		6.0	%	$	347,272		7.9	%	N/A		N/A
FirstBank		470,776		10.7	%		263,987		6.0	%		346,482		7.9	%	$	263,987		6.0	%
Tier 1 Capital (to average assets)
FB Financial Corporation	$	498,308		10.9	%	$	182,865		4.0	%	N/A		N/A			N/A		N/A
FirstBank		470,776		10.2	%		184,618		4.0	%	N/A		N/A			$	230,773		5.0	%
Common Equity Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation	$	468,308		10.6	%	$	198,810		4.5	%	$	281,648		6.4	%	N/A		N/A
FirstBank		470,776		10.7	%		197,990		4.5	%		280,486		6.4	%	$	285,985		6.5	%

	Actual					For capital adequacy purposes					Minimum Capital adequacy with capital buffer					To be well capitalized under prompt corrective action provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio			Amount		Ratio
December 31, 2017
Total Capital (to risk-weighted assets)
FB Financial Corporation	$	496,422		12.0	%	$	330,672		8.0	%	$	382,340		9.3	%	N/A		N/A
FirstBank		466,102		11.3	%		329,984		8.0	%		381,544		9.3	%	$	412,480		10.0	%
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation	$	472,381		11.4	%	$	247,969		6.0	%	$	299,629		7.3	%	N/A		N/A
FirstBank		442,061		10.7	%		247,422		6.0	%		298,968		7.3	%	$	247,422		6.0	%
Tier 1 Capital (to average assets)
FB Financial Corporation	$	472,381		10.5	%	$	180,643		4.0	%	N/A		N/A			N/A		N/A
FirstBank		442,061		9.8	%		180,987		4.0	%	N/A		N/A			$	226,234		5.0	%
Common Equity Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation	$	442,381		10.7	%	$	185,874		4.5	%	$	237,506		5.8	%	N/A		N/A
FirstBank		442,061		10.7	%		185,567		4.5	%		237,113		5.8	%	$	268,041		6.5	%

- Definition

The entire disclosure for banks, savings institutions, and credit unions, for regulatory capital requirements imposed by the Federal Reserve System (FRB), the Federal Deposit Insurance Corporation (FDIC), the Office of Thrift Supervision (OTS) or for any state imposed capital requirements, as applicable. The disclosure may include (1) a description of regulatory capital requirements (a) for capital adequacy purposes and (b) established by the prompt corrective action provisions of Section 38 of the Federal Depository Insurance Act; (2) the actual or possible material effects of noncompliance with such requirements; (3) whether the entity is in compliance with the regulatory capital requirements including (a) required and actual ratios and amounts of Tier 1 leverage, Tier 1 risk-based, and total risk-based capital, tangible capital (for savings institutions), and Tier 3 capital for market risk (for certain banks and bank holding companies), (b) factors that may significantly affect capital adequacy; (4) the prompt corrective action category in which the entity was classified as of its most recent notification; (5) whether management believes any conditions or events since notification have changed the entity's category. Also may include additional information that might be disclosed in situations where substantial doubt about the entity's ability to continue as a going concern for a reasonable period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1G
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1C
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958572-112826

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1E
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958574-112826

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958569-112826

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1F
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958575-112826

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1D
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958573-112826

+ Details

Stock-Based Compensation

6 Months Ended

Jun. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

Note (13)—Stock-Based Compensation:

The Company granted shares of common stock and restricted stock units as a part of its initial public offering and compensation arrangements for the benefit of employees, executive officers, and directors. Restricted stock unit grants are subject to time-based vesting. The total number of restricted stock units granted represents the maximum number of restricted stock units eligible to vest based upon the service conditions set forth in the grant agreements.

Following the initial public offering, participants in the EBI Plans were given the option to elect conversion of their outstanding cash-settled EBI Units to stock-settled EBI Units. At June 30, 2018 and December 31, 2017, there were 29,172 and 67,470 units valued at $1,188 and $2,833, respectively, outstanding under the equity based incentive plans for employees who elected cash settlement of EBI units. Expense related to the cash settled EBI was $102 and $219 for the three and six months ended June 30, 2018, respectively, and $184 and $482 for the three and six months ended June 30, 2017, respectively.

The following table summarizes information about vested and unvested restricted stock units, excluding cash-settled EBI units discussed above, outstanding at June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018					2017
	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 (unvested)		1,214,325		$	19.97		1,200,848		$	19.00
Grants		110,466			40.02		97,893			33.88
Released and distributed (vested)		(181,903	)		22.09		(70,819	)		19.00
Forfeited/expired		(7,060	)		21.81		(1,021	)		19.00
Balance at end of period (unvested)		1,135,828		$	21.59		1,226,901		$	19.67

The total fair value of restricted stock units vested and released, excluding cash-settled EBI units discussed above, was $404 and $4,018 for the three and six months ended June 30, 2018, respectively, and $3 and $1,346 for the three and six months ended June 30, 2017, respectively.

The compensation cost related to stock grants and vesting of restricted stock units, excluding cash-settled EBI units discussed above, was $1,861 and $3,819 for the three and six months ended June 30, 2018, respectively, and $1,802 and $3,154 for the three and six months ended June 30, 2017, respectively. The current period included a one-time expense of $249 related to the modification of vesting terms of certain grants during the six months ended June 30, 2018.

As of June 30, 2018 and December 31, 2017, there were $14,061 and $12,950, respectively, of total unrecognized compensation cost related to nonvested restricted stock units (excluding cash-settled EBI units discussed above) which is expected to be recognized over a weighted-average period of 2.78 years and 2.80 years, respectively. At June 30, 2018, there was $70 accrued in other liabilities related to dividends declared to be paid upon vesting and distribution of the underlying RSUs.

Employee Stock Purchase Plan:

In 2016, the Company adopted an employee stock purchase plan (“ESPP”) under which employees, through payroll deductions, are able to purchase shares of Company common stock. The purchase price is 95% of the lower of the market price on the first or last day of the offering period. The maximum number of shares issuable during any offering period is 200,000 shares, and a participant may not purchase more than 725 shares during any offering period (and, in any event, no more than $25,000 worth of common stock in any calendar year). There were 0 and 16,537 shares issued under the ESPP during the three and six months ended June 30, 2018, respectively. There were no such issuances during the three or six months ended June 30, 2017. As of June 30, 2018 and December 31, 2017, there were 2,444,428 shares and 2,460,965 shares, respectively, available for issuance under the ESPP.

Related party transactions

6 Months Ended

Jun. 30, 2018

Related party transactions

Note (14)—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.

An analysis of loans to executive officers, certain management, and directors of the Bank and their affiliates follows:

Loans outstanding at January 1, 2018	$	21,012
New loans and advances		1,611
Repayments		(4,657	)
Loans outstanding at June 30, 2018	$	17,966

Unfunded commitments to certain executive officers and directors and their associates totaled $10,189 and $4,672 at June 30, 2018 and December 31, 2017, respectively.

(B) Deposits:

The Bank held deposits from related parties totaling $238,891 and $110,465 as of June 30, 2018 and December 31, 2017, respectively.

(C) Leases:

The Bank leases various office spaces from entities under operating leases related to the former majority shareholder and his son, who is also a Director of the Company, under varying terms. The Company had $126 and $137 in unamortized leasehold improvements related to these leases at June 30, 2018 and December 31, 2017, respectively. These improvements are being amortized over a term not to exceed the length of the lease. Lease expense for these properties totaled $111 and $259 for the three and six months ended June 30, 2018, respectively, and $124 and $250 for the three and six months ended June 30, 2017, respectively.

(D) Other Investments:

The Company holds an investment in a fund that was issued by an entity owned by one of its directors. The balance of this included in other assets was $127 and $200 as of June 30, 2018 and December 31, 2017, respectively.

(E) Aviation time sharing agreement:

The Company has an aviation time sharing agreement with an entity owned by the Company’s Board of director chairman and his son, who is also a Director of the Company. This replaces the previous agreement dated December 21, 2012. The Company made payments of $53 and $125 during the three and six months ended June 30, 2018, respectively, and $2 and $27 during the three and six months ended June 30, 2017, respectively, under these agreements.

(F) Registration rights agreement:

The Company is party to a registration rights agreement with its former majority shareholder entered into in connection with the 2016 IPO, under which the Company is responsible for payment of expenses (other than underwriting discounts and commissions) relating to sales to the public by the shareholder of shares of the Company’s common stock beneficially owned by him. Such expenses include registration fees, legal and accounting fees, and printing costs payable by the Company and expensed when incurred. During the second quarter of 2018, the Company paid $0.7 million under this agreement.

Basis of presentation (Policies)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Subsequent Events

Subsequent events

The Company has evaluated, for consideration of recognition or disclosure, subsequent events that occurred through the date of issuance of these financial statements. The Company has determined that there were no other subsequent events other than described below that occurred after June 30, 2018, but prior to the issuance of these financial statements that would have a material impact on the Company’s consolidated financial statements.

On July 19, 2018, the Company declared a regular quarterly dividend of $0.06 per share to be paid on August 15, 2018 to shareholders of record as of July 31, 2018, totaling approximately $1,909.

On August 7, 2018, the Federal Home Loan Bank of Cincinnati increased the capacity on the Company’s line of credit from $300,000 to $800,000.

Earnings Per Share

Earnings per share

Basic earnings per common share (“EPS”) excludes dilution and is computed by dividing earnings attributable to common shareholders by the weighted average number of common shares outstanding during the period. Diluted EPS includes the dilutive effect of additional potential common shares issuable under the restricted stock units granted but not yet vested and distributable. Diluted EPS is computed by dividing earnings attributable to common shareholders by the weighted average number of common shares outstanding for the year, plus an incremental number of common-equivalent shares computed using the treasury stock method.

Unvested share-based payment awards, which include the right to receive non-forfeitable dividends or dividend equivalents, are considered to participate with common shareholders in undistributed earnings for purposes of computing EPS. Companies that have such participating securities, including FB Financial, are required to calculate basic and diluted EPS using the two-class method. Certain restricted stock awards granted by the Company include non-forfeitable dividend equivalents and are considered participating securities. Calculations of EPS under the two-class method (i) exclude from the numerator any dividends paid or owed on participating securities and any undistributed earnings considered to be attributable to participating securities and (ii) exclude from the denominator the dilutive impact of the participating securities.

The following is a summary of the basic and diluted earnings per common share calculation for each of the periods presented:

	Three Months Ended June 30,					Six Months Ended June 30,
	2018			2017		2018			2017
Basic earnings per share calculation:
Net income	$	22,065		$	11,239	$	41,819		$	20,992
Dividends paid on and undistributed earnings allocated to participating securities		(117	)		—		(223	)		—
Earnings attributable to common shareholders	$	21,948		$	11,239	$	41,596		$	20,992
Weighted-average basic shares outstanding		30,678,732			25,741,968		30,646,189			24,944,633
Basic earnings per share	$	0.72		$	0.44	$	1.36		$	0.84
Diluted earnings per share:
Earnings attributable to common shareholders	$	21,948		$	11,239	$	41,596		$	20,992
Weighted-average basic shares outstanding		30,678,732			25,741,968		30,646,189			24,944,633
Weighted-average diluted shares contingently issuable		615,312			559,490		629,657			505,786
Weighted-average diluted shares outstanding		31,294,044			26,301,458		31,275,846			25,450,419
Diluted earnings per share	$	0.70		$	0.43	$	1.33		$	0.82

Recently Adopted Accounting Principles

Recently adopted accounting principles:

Except as set forth below, the Company did not adopt any new accounting policies that were not disclosed in the Company’s 2017 audited consolidated financial statements included on Form 10-K.

On January 1, 2018, the Company adopted the following newly issued accounting standards:

In May 2014, the FASB issued an update to Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers”. The Company adopted this guidance on January 1, 2018 and all subsequent amendments to the ASU (collectively, “ASC 606”) which (i) creates a single framework for recognizing revenue from contracts with customers that fall within its scope and (ii) revises when it is appropriate to recognize a gain (loss) from the transfer of nonfinancial assets, such as OREO. The majority of the Company’s revenues come from interest income and other sources, including loans, leases, securities and derivatives that are outside the scope of ASC 606. The Company’s services that fall within the scope of ASC 606 are presented within Noninterest income and are recognized as revenue as the Company satisfies its obligation to the customer. Services within the scope of ASC 606 include deposit service charges on deposits, interchange income, investment services and trust income, and the sale of OREO, all within the Banking Segment. The Company has evaluated the effect of this updated on these fee-based income streams and concluded that adoption did not result in a change to the accounting for any of the in-scope revenue streams; as such, no cumulative effect adjustment was recorded.

The following is a summary of the implementation considerations for the revenue streams that fall within the scope of Topic 606:

•

Service charges on deposits, investment services and trust income, and interchange fees — Fees from these services are either transaction based, for which the performance obligations are satisfied when the individual transaction is processed, or set periodic service charges, for which the performance obligations are satisfied over the period the service is provided. Transaction based fees are recognized at the time the transaction is processed, and periodic service charges are recognized over the service period. The adoption of Topic 606 had no impact on the Company's revenue recognition practice for these services.

•

Gains on sales of other real estate — ASU 2014-09 creates Topic 610-20, under which a gain on sale should be recognized when a contract for sale exists and control of the asset has been transferred to the buyer. Topic 606 list several criteria which must exist to conclude that a contract for sale exists, including a determination that the institution will collect substantially all of the consideration to which it is entitled. This presents a key difference between the current and new guidance related to the recognition of the gain when the institution finances the sale of the property. Rather than basing recognition on the amount of the buyer's initial investment, which was the primary consideration under prior guidance, the analysis is now based on various factors including not only the loan to value, but also the credit quality of the borrower, the structure of the loan, and any other factors that may affect collectability. While these differences may affect the decision to recognize or defer gains on sales of other real estate in circumstances where the Company has financed the sale, these amounts have not been material to its financial statements.

In January 2016, the FASB released ASU 2016-01, “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. Results for reporting periods beginning after January 1, 2018 are presented under this method while prior period disclosures are presented under legacy GAAP. On January 1, 2018, the Company recorded a net loss in beginning retained earnings of $109 in connection with this transition.

In August 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments (Topic 230).” ASU 2016-15 provides guidance related to certain cash flow issues in order to reduce the current and potential future diversity in practice. This adoption did not have an impact on our financial statements.

In May 2017, the FASB issued ASU 2017-09, “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. The adoption of this update on January 1, 2018 did not have a significant impact on the Company’s consolidated financial statements.

In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities.” The amendments in this ASU make more financial and non-financial hedging strategies eligible for hedge accounting. It also amends the presentation and disclosure requirements and changes how companies assess effectiveness. There was no impact to the Company’s financial statements or disclosures as a result of this early adoption as of January 1, 2018.

Newly issued not yet effective accounting standards:

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.

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 March 2017, the FASB issued ASU 2017-08, “Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities.” The amendments in this ASU shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount, which continue to be amortized to maturity. Public business entities must prospectively apply the amendments in this ASU to annual periods beginning after December 15, 2018, including interim periods. The adoption of this update will not have an impact on the Company’s consolidated financial statements.

Basis of Presentation (Tables)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Summary of Basic and Diluted Earnings Per Common Share

The following is a summary of the basic and diluted earnings per common share calculation for each of the periods presented:

	Three Months Ended June 30,					Six Months Ended June 30,
	2018			2017		2018			2017
Basic earnings per share calculation:
Net income	$	22,065		$	11,239	$	41,819		$	20,992
Dividends paid on and undistributed earnings allocated to participating securities		(117	)		—		(223	)		—
Earnings attributable to common shareholders	$	21,948		$	11,239	$	41,596		$	20,992
Weighted-average basic shares outstanding		30,678,732			25,741,968		30,646,189			24,944,633
Basic earnings per share	$	0.72		$	0.44	$	1.36		$	0.84
Diluted earnings per share:
Earnings attributable to common shareholders	$	21,948		$	11,239	$	41,596		$	20,992
Weighted-average basic shares outstanding		30,678,732			25,741,968		30,646,189			24,944,633
Weighted-average diluted shares contingently issuable		615,312			559,490		629,657			505,786
Weighted-average diluted shares outstanding		31,294,044			26,301,458		31,275,846			25,450,419
Diluted earnings per share	$	0.70		$	0.43	$	1.33		$	0.82

Mergers and acquisitions (Tables) - Clayton Banks

6 Months Ended

Jun. 30, 2018

Business Acquisition [Line Items]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

As of December 31, 2017, the Company finalized its valuation of all assets acquired and liabilities assumed, resulting in no material changes to preliminary purchase accounting adjustments. The following tables present the final estimated fair value of net assets acquired as of the July 31, 2017 acquisition date and the consideration paid and an allocation of the purchase price to net assets acquired:

	As of July 31, 2017
	As Recorded by FB Financial Corporation⁽¹⁾
Assets
Cash and cash equivalents	$	49,059
Investment securities		59,493
FHLB stock		3,409
Loans		1,059,728
Allowance for loan losses		—
Premises and equipment		18,866
Other real estate owned		6,888
Intangibles, net		12,334
Other assets		5,978
Total assets	$	1,215,755
Liabilities
Interest-bearing deposits	$	670,054
Non-interest bearing deposits		309,464
Borrowings		84,831
Accrued expenses and other liabilities		5,245
Total liabilities	$	1,069,594
Net assets acquired	$	146,161

Schedule of Consideration Paid and Allocation of Purchase Price to Net Assets Acquired

Purchase price:
Equity consideration
Common stock issued		1,521,200
Price per share as of July 31, 2017	$	34.37
Total equity consideration			$	52,284
Cash consideration				184,200	⁽²⁾
Total consideration paid			$	236,484
Preliminary allocation of consideration paid:
Fair value of net assets acquired including identifiable intangible assets			$	146,161
Goodwill				90,323
Total consideration paid			$	236,484

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 include the effect of all cost-saving or revenue-enhancing strategies.

	Three Months Ended June 30,		Six Months Ended June 30,
	2017		2017
Net interest income	$	47,404	$	94,091
Total revenues	$	84,545	$	163,826
Net income	$	17,290	$	34,018

Investment securities (Tables)

6 Months Ended

Jun. 30, 2018

Investments Debt And Equity Securities [Abstract]

Summary of Amortized Cost of Securities and Fair Values

The amortized cost of securities and their fair values at June 30, 2018 and December 31, 2017 are shown below:

	June 30, 2018
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair Value
Investment Securities
Available-for-sale debt securities
U.S. government agency securities	$	999	$	—	$	(16	)	$	983
Mortgage-backed securities - residential		494,599		169		(16,794	)		477,974
Municipals, tax exempt		122,710		1,472		(1,935	)		122,247
Treasury securities		7,364		—		(208	)		7,156
Total	$	625,672	$	1,641	$	(18,953	)	$	608,360

	December 31, 2017
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair Value
Investment Securities
Available-for-sale debt securities
U.S. government agency securities	$	999	$	—	$	(13	)	$	986
Mortgage-backed securities - residential		425,557		374		(7,150	)		418,781
Municipals, tax exempt		107,127		2,692		(568	)		109,251
Treasury securities		7,345		—		(93	)		7,252
Total debt securities		541,028		3,066		(7,824	)		536,270
Equity and other securities		7,870		1		(149	)		7,722
Total investment securities	$	548,898	$	3,067	$	(7,973	)	$	543,992

Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity

Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary.

	June 30, 2018				December 31, 2017
	Available-for-sale				Available-for-sale
	Amortized cost		Fair value		Amortized cost		Fair value
Due in one year or less	$	11,991	$	12,195	$	905	$	925
Due in one to five years		20,026		20,083		28,332		28,878
Due in five to ten years		18,795		18,769		19,218		19,588
Due in over ten years		80,261		79,339		67,016		68,098
		131,073		130,386		115,471		117,489
Mortgage-backed securities - residential		494,599		477,974		425,557		418,781
Total debt securities	$	625,672	$	608,360	$	541,028	$	536,270

Summary of Sales of Available-for-Sale Securities

Sales of available-for-sale securities were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Proceeds from sales	$	—	$	12,158	$	221		12,158
Gross realized gains		—		77		—		77
Gross realized losses		—		48		9		48

Schedule of Gross Unrealized Losses

The following tables show gross unrealized losses at June 30, 2018 and December 31, 2017, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:

	June 30, 2018
	Less than 12 months				12 months or more				Total
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized loss
U.S. government agency securities	$	—	$	—	$	983	$	16	$	983	$	16
Mortgage-backed securities - residential		185,980		4,472		261,675		12,322		447,655		16,794
Municipals, tax exempt		32,413		760		19,158		1,175		51,571		1,935
Treasury securities		7,156		208		—		—		7,156	$	208
Total debt securities	$	225,549	$	5,440	$	281,816	$	13,513	$	507,365	$	18,953

	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 and other securities		—		—		3,050		149		3,050		149
	$	122,217	$	1,174	$	314,406	$	6,799	$	436,623	$	7,973

Loans and Allowance for Loan Losses (Tables)

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Loans Outstanding by Major Lending Classification

Loans outstanding at June 30, 2018 and December 31, 2017, by major lending classification are as follows:

	June 30,			December 31,
	2018			2017
Commercial and industrial	$	813,054		$	715,075
Construction		522,471			448,326
Residential real estate:
1-to-4 family mortgage		528,158			480,989
Residential line of credit		208,668			194,986
Multi-family mortgage		57,344			62,374
Commercial real estate:
Owner occupied		470,872			495,872
Non-owner occupied		600,629			551,588
Consumer and other		214,379			217,701
Gross loans		3,415,575			3,166,911
Less: Allowance for loan losses		(26,347	)		(24,041	)
Net loans	$	3,389,228		$	3,142,870

Changes in Accretable Yield on Purchase Credit Impaired Loans

The following table presents changes in the value of the accretable yield for PCI loans for the periods indicated.

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Balance at beginning of period	$	(16,955	)	$	(2,142	)	$	(17,682	)	$	(2,444	)
Principal reductions/ pay-offs		(2,158	)		(292	)		(3,452	)		(990	)
Recoveries		—			—			—			(23	)
Accretion		2,639			589			4,840			1,612
Other changes		(3,695	)		—			(3,875	)		—
Balance at end of period	$	(20,169	)	$	(1,845	)	$	(20,169	)	$	(1,845	)

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 three and six months ended June 30, 2018 and 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
Three Months Ended June 30, 2018
Beginning balance - March 31, 2018	$	4,578		$	7,866		$	3,122		$	1,165		$	449		$	3,014		$	2,753	$	1,459		$	24,406
Provision for loan losses		39			310			218			(414	)		(58	)		168			519		281			1,063
Recoveries of loans previously charged-off		135			862			43			44			—			108			—		107			1,299
Loans charged off		(5	)		(15	)		(5	)		—			—			—			—		(396	)		(421	)
Ending balance - June 30, 2018	$	4,747		$	9,023		$	3,378		$	795		$	391		$	3,290		$	3,272	$	1,451		$	26,347
Six Months Ended June 30, 2018
Beginning balance - December 31, 2017	$	4,461		$	7,135		$	3,197		$	944		$	434		$	3,558		$	2,817	$	1,495		$	24,041
Provision for loan losses		241			789			188			(200	)		(43	)		(399	)		404		400			1,380
Recoveries of loans previously charged-off		270			1,114			58			71			—			131			51		313			2,008
Loans charged off		(225	)		(15	)		(65	)		(20	)		—			—			—		(757	)		(1,082	)
Ending balance - June 30, 2018	$	4,747		$	9,023		$	3,378		$	795		$	391		$	3,290		$	3,272	$	1,451		$	26,347

	Commercial and industrial			Construction			1-to-4 family residential mortgage			Residential line of credit			Multi- family residential mortgage		Commercial real estate owner occupied		Commercial real estate non-owner occupied			Consumer and other			Total
Three Months Ended June 30, 2017
Beginning balance - March 31, 2017	$	5,402		$	5,598		$	2,896		$	1,514		$	508	$	3,387	$	2,660		$	933		$	22,898
Provision for loan losses		(1,342	)		(48	)		99			(29	)		5		585		(210	)		75			(865	)
Recoveries of loans previously charged-off		1,511			29			14			155			—		11		2			283			2,005
Loans charged off		(131	)		—			(35	)		(195	)		—		—		—			(430	)		(791	)
Ending balance - June 30, 2017	$	5,440		$	5,579		$	2,974		$	1,445		$	513	$	3,983	$	2,452		$	861		$	23,247
Six Months Ended June 30, 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		(1,163	)		587			(140	)		(184	)		9		666		(1,208	)		311			(1,122	)
Recoveries of loans previously charged-off		1,594			58			40			211			—		15		1,641			296			3,855
Loans charged off		(300	)		(6	)		(123	)		(195	)		—		—		—			(609	)		(1,233	)
Ending balance - June 30, 2017	$	5,440		$	5,579		$	2,974		$	1,445		$	513	$	3,983	$	2,452		$	861		$	23,247

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, loans collectively evaluated for impairment and loans acquired with deteriorated credit quality as of June 30, 2018 and December 31, 2017:

													June 30, 2018
	Commercial and industrial		Construction		1-to-4 family residential mortgage		Residential line of credit		Multi- family residential mortgage		Commercial real estate owner occupied		Commercial real estate non-owner occupied		Consumer and other		Total
Amount of allowance allocated to:
Individually evaluated for impairment	$	49	$	—	$	12	$	—	$	—	$	124	$	—	$	—	$	185
Collectively evaluated for impairment		4,685		8,998		3,227		795		391		3,082		2,894		1,407		25,479
Acquired with deteriorated credit quality		13		25		139		—		—		84		378		44		683
Ending balance - June 30, 2018	$	4,747	$	9,023	$	3,378	$	795	$	391	$	3,290	$	3,272	$	1,451	$	26,347

													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

Amount of Loans by Loan Category Broken Between Loans Individually and Collectively Evaluated for Impairment and Acquired with Deteriorated Credit Quality

The following table provides the amount of loans by loan category broken between loans individually evaluated for impairment, loans collectively evaluated for impairment and loans acquired with deteriorated credit quality as of June 30, 2018 and December 31, 2017:

													June 30, 2018
	Commercial and industrial		Construction		1-to-4 family residential mortgage		Residential line of credit		Multi- family residential mortgage		Commercial real estate owner occupied		Commercial real estate non-owner occupied		Consumer and other		Total
Loans, net of unearned income
Individually evaluated for impairment	$	2,186	$	1,281	$	1,503	$	—	$	951	$	2,266	$	1,049	$	27	$	9,263
Collectively evaluated for impairment		809,102		514,129		505,643		208,668		56,377		460,281		581,531		192,268		3,327,999
Acquired with deteriorated credit quality		1,766		7,061		21,012		—		16		8,325		18,049		22,084		78,313
Ending balance - June 30, 2018	$	813,054	$	522,471	$	528,158	$	208,668	$	57,344	$	470,872	$	600,629	$	214,379	$	3,415,575

													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

Credit Quality Indicators by Portfolio Class

The following table shows credit quality indicators by portfolio class at June 30, 2018 and December 31, 2017:

June 30, 2018	Pass		Watch		Substandard		Total
Loans, excluding purchased credit impaired loans
Commercial and industrial	$	746,253	$	59,476	$	5,559	$	811,288
Construction		499,370		14,278		1,762		515,410
Residential real estate:
1-to-4 family mortgage		490,856		8,625		7,665		507,146
Residential line of credit		205,614		1,632		1,422		208,668
Multi-family mortgage		56,245		133		950		57,328
Commercial real estate:
Owner occupied		434,025		20,435		8,087		462,547
Non-owner occupied		565,195		16,096		1,289		582,580
Consumer and other		185,919		2,289		4,087		192,295
Total loans, excluding purchased credit impaired loans	$	3,183,477	$	122,964	$	30,821	$	3,337,262

Purchased credit impaired loans
Commercial and industrial	$	—	$	1,187	$	579	$	1,766
Construction		—		3,332		3,729		7,061
Residential real estate:
1-to-4 family mortgage		—		16,721		4,291		21,012
Residential line of credit		—		—		—		—
Multi-family mortgage		—		—		16		16
Commercial real estate:
Owner occupied		—		4,488		3,837		8,325
Non-owner occupied		—		7,465		10,584		18,049
Consumer and other		—		17,474		4,610		22,084
Total purchased credit impaired loans	$	—	$	50,667	$	27,646	$	78,313
Total loans	$	3,183,477	$	173,631	$	58,467	$	3,415,575

December 31, 2017	Pass		Watch		Substandard		Total
Loans, excluding purchased credit impaired loans
Commercial and industrial	$	657,595	$	50,946	$	4,390	$	712,931
Construction		431,242		7,388		1,968		440,598
Residential real estate:
1-to-4 family mortgage		440,202		9,522		7,767		457,491
Residential line of credit		192,427		1,184		1,375		194,986
Multi-family mortgage		61,234		142		978		62,354
Commercial real estate:
Owner occupied		451,140		28,308		4,462		483,910
Non-owner occupied		517,253		14,199		1,972		533,424
Consumer and other		189,081		2,712		589		192,382
Total loans, excluding purchased credit impaired loans	$	2,940,174	$	114,401	$	23,501	$	3,078,076

Purchased credit impaired loans
Commercial and industrial	$	—	$	1,499	$	645	$	2,144
Construction		—		3,324		4,404		7,728
Residential real estate:
1-to-4 family mortgage		—		20,284		3,214		23,498
Residential line of credit		—		—		—		—
Multi-family mortgage		—		—		20		20
Commercial real estate:
Owner occupied		—		4,631		7,331		11,962
Non-owner occupied		—		7,359		10,805		18,164
Consumer and other		—		19,751		5,568		25,319
Total purchased credit impaired loans	$	—	$	56,848	$	31,987	$	88,835
Total loans	$	2,940,174	$	171,249	$	55,488	$	3,166,911

Past Due Loans

Nonperforming loans include loans that are no longer accruing interest (non-accrual 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.

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, loans current on payments accruing interest and purchased credit impaired loans by category at June 30, 2018 and December 31, 2017:

June 30, 2018	30-89 days past due		90 days or more and accruing interest		Non-accrual loans		Loans current on payments and accruing interest		Purchased Credit Impaired loans		Total
Commercial and industrial	$	3,138	$	145	$	707	$	807,298	$	1,766	$	813,054
Construction		850		193		328		514,039		7,061		522,471
Residential real estate:
1-to-4 family mortgage		3,605		859		2,293		500,389		21,012		528,158
Residential line of credit		1,345		254		507		206,562		—		208,668
Multi-family mortgage		—		—		—		57,328		16		57,344
Commercial real estate:
Owner occupied		249		—		2,052		460,246		8,325		470,872
Non-owner occupied		—		—		1,212		581,368		18,049		600,629
Consumer and other		1,807		188		75		190,225		22,084		214,379
Total	$	10,994	$	1,639	$	7,174	$	3,317,455	$	78,313	$	3,415,575

December 31, 2017	30-89 days past due		90 days or more and accruing interest		Non-accrual loans		Loans current on payments and accruing interest		Purchased Credit Impaired loans		Total
Commercial and industrial	$	5,859	$	90	$	533	$	706,449	$	2,144	$	715,075
Construction		1,412		241		300		438,645		7,728		448,326
Residential real estate:
1-to-4 family mortgage		4,678		956		2,548		449,309		23,498		480,989
Residential line of credit		527		134		699		193,626		—		194,986
Multi-family mortgage		—		—		—		62,354		20		62,374
Commercial real estate:
Owner occupied		521		358		2,582		480,449		11,962		495,872
Non-owner occupied		121		—		1,371		531,932		18,164		551,588
Consumer and other		1,945		217		68		190,152		25,319		217,701
Total	$	15,063	$	1,996	$	8,101	$	3,052,916	$	88,835	$	3,166,911

Impaired Loans Recognized, Segregated by Class

Impaired loans recognized in conformity with ASC 310-20 at June 30, 2018 and December 31, 2017, segregated by class, were as follows:

June 30, 2018	Recorded investment		Unpaid principal		Related allowance
With a related allowance recorded:
Commercial and industrial	$	153	$	153	$	49
Residential real estate:
1-to-4 family mortgage		187		488		12
Commercial real estate:
Owner occupied		754		819		124
Total	$	1,094	$	1,460	$	185
With no related allowance recorded:
Commercial and industrial	$	2,033	$	2,387	$	—
Construction		1,281		1,314		—
Residential real estate:
1-to-4 family mortgage		1,316		1,322		—
Multi-family mortgage		951		951		—
Commercial real estate:
Owner occupied		1,512		2,039		—
Non-owner occupied		1,049		1,781		—
Consumer and other		27		27		—
Total	$	8,169	$	9,821	$	—
Total impaired loans	$	9,263	$	11,281	$	185

December 31, 2017	Recorded investment		Unpaid principal		Related allowance
With a related allowance recorded:
Commercial and industrial	$	53	$	53	$	20
Residential real estate:
1-to-4 family mortgage		194		495		18
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		—
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

Average recorded investment and interest income on a cash basis recognized during the three and six months ended June 30, 2018 and 2017 on impaired loans, segregated by class, were as follows:

	Three Months Ended				Six Months Ended
June 30, 2018	Average recorded investment		Interest income recognized (cash basis)		Average recorded investment		Interest income recognized (cash basis)
With a related allowance recorded:
Commercial and industrial	$	103	$	2	$	103	$	3
Residential real estate:
1-to-4 family mortgage		189		2		191		4
Commercial real estate:
Owner occupied		670		21		799		27
Non-owner occupied		71		—		72		2
Total	$	1,033	$	25	$	1,165	$	36
With no related allowance recorded:
Commercial and industrial	$	1,683	$	43	$	1,780	$	59
Construction		1,283		6		1,285		36
Residential real estate:
1-to-4 family mortgage		1,309		31		1,192		44
Multi-family mortgage		958		12		965		24
Commercial real estate:
Owner occupied		1,539		28		1,594		60
Non-owner occupied		1,310		—		1,313		7
Consumer and other		28		1		26		1
Total	$	8,110	$	121	$	8,155	$	231
Total impaired loans	$	9,143	$	146	$	9,320	$	267
June 30, 2017
With a related allowance recorded:
Commercial and industrial	$	729	$	5	$	792	$	10
Residential real estate:
1-to-4 family mortgage		98		—		100		—
Commercial real estate:
Owner occupied		616		8		622		20
Non-owner occupied		514		2		829		2
Consumer and other		—		—		1		—
Total	$	1,957	$	15	$	2,344	$	32
With no related allowance recorded:
Commercial and industrial	$	519	$	7	$	557	$	16
Construction		302		4		1,493		9
Residential real estate:
1-to-4 family mortgage		2,106		15		2,232		32
Residential line of credit		—		—		156		—
Multi-family mortgage		1,008		12		1,014		23
Commercial real estate:
Owner occupied		1,801		23		1,941		61
Non-owner occupied		1,602		5		1,323		5
Consumer and other		25		—		25		1
Total	$	7,363	$	66	$	8,741	$	147
Total impaired loans	$	9,320	$	81	$	11,085	$	179

Financial Effect of TDRs

The following tables present the financial effect of TDRs recorded during the periods indicated:

Three Months Ended June 30, 2018	Number of loans		Pre-modification outstanding recorded investment		Post-modification outstanding recorded investment		Charge offs and specific reserves
Commercial and industrial		2	$	887	$	887	$	—
Total		2	$	887	$	887	$	—

Six Months Ended June 30, 2018	Number of loans	Pre-modification outstanding recorded investment		Post-modification outstanding recorded investment		Charge offs and specific reserves
Commercial and industrial	2	$	887	$	887	$	—
Residential real estate:
1-to-4 family mortgage	1		249		249		—
Consumer and other	1		5		5		—
Total	4	$	1,141	$	1,141	$	—

Six Months Ended June 30, 2017	Number of loans	Pre-modification outstanding recorded investment		Post-modification outstanding recorded investment		Charge offs and specific reserves
Commercial and industrial	1	$	5	$	5	$	—
Commercial real estate:
Owner occupied	1		377		377		—
Non-owner occupied	2		711		711		—
Total	4	$	1,093	$	1,093	$	—

Other Real Estate Owned (Tables)

6 Months Ended

Jun. 30, 2018

Real Estate [Abstract]

Summary of Other Real Estate Owned

The following table summarizes other real estate owned for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Balance at beginning of period	$	15,334		$	6,811		$	16,442		$	7,403
Transfers from loans		384			274			1,014			1,162
Properties sold		(777	)		(702	)		(2,209	)		(2,930	)
(Loss) gain on sale of other real estate owned		51			77			8			948
Transferred to loans		(325	)		(36	)		(445	)		(36	)
Write-downs		(28	)		(54	)		(171	)		(177	)
Balance at end of period	$	14,639		$	6,370		$	14,639		$	6,370

Mortgage Servicing Rights (Tables)

6 Months Ended

Jun. 30, 2018

Transfers And Servicing Of Financial Assets [Abstract]

Schedule of Changes in Mortgage Servicing Rights

Changes in the Company’s mortgage servicing rights were as follows for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended June 30,						Six Months Ended June 30,
		2018			2017			2018			2017
Carrying value prior to policy change	$	93,160		$	47,593		$	76,107		$	32,070
Fair value impact of change in accounting policy		—			—			—			1,011
Carrying value at beginning of period		93,160			47,593			76,107			33,081
Capitalization		16,304			14,646			29,814			29,659
Sales		—			(11,935	)		—			(11,935	)
Change in fair value:
Due to pay-offs/pay-downs		(2,207	)		(532	)		(5,267	)		(797	)
Due to change in valuation inputs or assumptions		2,192			(1,308	)		8,795			(1,544	)
Carrying value at end of period	$	109,449		$	48,464		$	109,449		$	48,464

Schedule of Servicing Income and Expense Included in Mortgage Banking Income

The following table summarizes servicing income and expense included in mortgage banking income and other noninterest expense within the Mortgage Segment operating results, respectively, for the three and six months ended June 30, 2018 and 2017, respectively:

	Three Months Ended June 30,						Six Months Ended June 30,
		2018			2017			2018			2017
Servicing income:
Servicing income	$	5,604		$	2,747		$	10,397		$	5,495
Change in fair value of mortgage servicing rights		(15	)		(1,840	)		3,528			(2,341	)
Change in fair value of mortgage servicing rights hedging instruments		(1,763	)		—			(7,019	)		—
Gross servicing income		3,826			907			6,906			3,154
Servicing expense:
Loss on sale of mortgage servicing rights		—			249			—			249
Direct servicing expenses		2,078			1,204			3,873			2,138
Gross servicing expense		2,078			1,453			3,873			2,387
Net servicing income	$	1,748		$	(546	)	$	3,033		$	767

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 June 30, 2018 and December 31, 2017 are as follows:

	June 30,			December 31,
		2018			2017
Unpaid principal balance	$	8,483,445		$	6,529,431
Weighted-average prepayment speed (CPR)		7.63	%		8.90	%
Estimated impact on fair value of a 10% increase		(3,588	)		(3,026	)
Estimated impact on fair value of a 20% increase		(6,921	)		(5,855	)
Discount rate		10.23	%		9.75	%
Estimated impact on fair value of a 100 bp increase		(4,578	)		(3,052	)
Estimated impact on fair value of a 200 bp increase		(8,813	)		(5,867	)
Weighted-average coupon interest rate		4.06	%		3.94	%
Weighted-average servicing fee (basis points)		28			28
Weighted-average remaining maturity (in months)		331			335

Income Taxes (Tables)

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Schedule of Allocation of Federal and State Income Taxes between Current and Deferred Portions

Allocation of federal and state income taxes between current and deferred portions is as follows:

	For the three months ended
	June 30,
	2018		2017
Current	$	2,195	$	4,047
Deferred		5,599		2,527
Total	$	7,794	$	6,574

	For the six months ended
			June 30,
	2018		2017
Current	$	2,195	$	4,047
Deferred		11,081		7,952
Total	$	13,276	$	11,999

Schedule of Differences in Federal Income Tax Expense and State Tax Expense from Statutory Federal and State Rates

Federal income tax expense differs from the statutory federal rates of 21% for the three and six months ended June 30, 2018 and 35% for the three and six months ended June 30, 2017 due to the following:

	For the Three Months Ended
									June 30,
	2018					2017
Federal taxes calculated at statutory rate	$	6,270		21.0	%	$	6,234			35.0	%
Increase (decrease) resulting from:
State taxes, net of federal benefit		1,543		5.2	%		741			4.2	%
Benefit of equity based compensation		(15	)	-0.1	%		20			0.1	%
Municipal interest income, net of interest disallowance		(207	)	-0.7	%		(376	)		-2.1	%
Bank owned life insurance		(13	)	0.0	%		(21	)		-0.1	%
Stock offering costs		141		0.5	%		—			0.0	%
Other		75		0.2	%		(24	)		-0.2	%
Income tax expense, as reported	$	7,794		26.1	%	$	6,574			36.9	%

	For the Six Months Ended
									June 30,
	2018					2017
Federal taxes calculated at statutory rate	$	11,570		21.0	%	$	11,539			35.0	%
Increase (decrease) resulting from:
State taxes, net of federal benefit		2,686		4.9	%		1,351			4.1	%
Benefit of equity based compensation		(751	)	-1.4	%		(175	)		-0.5	%
Municipal interest income, net of interest disallowance		(408	)	-0.7	%		(742	)		-2.3	%
Bank owned life insurance		(25	)	0.0	%		(42	)		-0.1	%
Stock offering costs		141		0.3	%		—			0.0	%
Other		63		0.0	%		68			0.2	%
Income tax expense, as reported	$	13,276		24.1	%	$	11,999			36.4	%

Schedule of Net Deferred Tax liability

The components of the net deferred tax liability at June 30, 2018 and December 31, 2017, are as follows:

	June 30,			December 31,
	2018			2017
Deferred tax assets:
Allowance for loan losses	$	6,865		$	6,264
Amortization of core deposit intangible		898			759
Deferred compensation		4,448			6,158
Unrealized loss on available-for-sale debt securities		4,563			988
Other		3,222			3,599
Subtotal		19,996			17,768
Deferred tax liabilities:
FHLB stock dividends		(550	)		(550	)
Depreciation		(4,322	)		(4,115	)
Cash flow hedges		(930	)		—
Mortgage servicing rights		(28,518	)		(19,830	)
Other		(5,969	)		(5,131	)
Subtotal		(40,289	)		(29,626	)
Net deferred tax liability	$	(20,293	)	$	(11,858	)

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2018

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.

	June 30,		December 31,
	2018		2017
Commitments to extend credit, excluding interest rate lock commitments	$	1,088,486	$	977,276
Letters of credit		18,555		22,882
Balance at end of period	$	1,107,041	$	1,000,158

Summary of Allowance for Loan Repurchases or Indemnifications

The following table summarizes the activity in the repurchase reserve:

	For the three months ended						For the six months ended
	June 30,						June 30,
	2018			2017			2018			2017
Balance at beginning of period	$	3,514		$	2,842		$	3,386		$	2,659
Provision for loan repurchases or indemnifications		206			201			392			384
Losses on loans repurchased or indemnified		(74	)		(6	)		(132	)		(6	)
Balance at end of period	$	3,646		$	3,037		$	3,646		$	3,037

Derivatives (Tables)

6 Months Ended

Jun. 30, 2018

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Schedule of Derivative Financial Instruments

The following tables provide details on the Company’s derivative financial instruments as of the dates presented:

	June 30, 2018
	Notional Amount		Asset		Liability
Not designated as hedging:
Interest rate contracts	$	231,899	$	3,798	$	3,798
Forward commitments		717,330		—		1,682
Interest rate-lock commitments		597,569		9,495		—
Futures contracts		231,000		445		—
Option contracts		12,000		83		—
Total	$	1,789,798	$	13,821	$	5,480

	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

	June 30, 2018
	Notional Amount		Asset		Liability
Designated as hedging:
Interest rate swaps	$	30,000	$	1,296	$	—
Total	$	30,000	$	1,296	$	—

	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:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Not designated as hedging instruments (included in mortgage banking income):
Interest rate lock commitments	$	(684	)	$	(1,433	)	$	2,727		$	1,509
Forward commitments		635			(3,928	)		5,953			(7,248	)
Futures contracts		(1,369	)		—			(3,816	)		—
Options contracts		(38	)		—			5			—
Total	$	(1,456	)	$	(5,361	)	$	4,869		$	(5,739	)

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018			2017
Designated as hedging:
Amount of gain (loss) reclassified from other comprehensive income and recognized in interest expense on long-term debt	$	25		—	$	(7	)		—

Schedule of Other Comprehensive Income (Loss), Net of Tax, for Derivative Instruments Designated as Cash Flow Hedges

The following table discloses the amount included in other comprehensive income (loss), net of tax, for derivative instruments designated as cash flow hedges for the periods presented:

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Designated as hedging:
Amount of gain recognized in other comprehensive income, net of tax	$	196		—	$	1,469		—

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41641-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579240-113959

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41620-113959

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Estimated Fair Values and Carrying Values of Financial Instruments

The following table contains the estimated fair values and the related carrying values of the Company's financial instruments. Items which are not financial instruments are not included. Due to the adoption of ASU 2016-01 as of January 1, 2018, the fair value as presented below is measured using the exit price notion in the periods after adoption and may not be comparable with prior periods presented as a result of the change in methodology.

			Fair Value
June 30, 2018	Carrying amount		Level 1		Level 2		Level 3		Total
Financial assets:
Cash and cash equivalents	$	104,417	$	104,417	$	—	$	—	$	104,417
Investment securities		611,435		—		611,435		—		611,435
Federal Home Loan Bank Stock		12,641	N/A		N/A		N/A		N/A
Loans, net		3,389,228		—		—		3,384,932		3,384,932
Loans held for sale		374,916		—		374,916		—		374,916
Interest receivable		12,729		—		12,729		—		12,729
Mortgage servicing rights		109,449		—		—		109,449		109,449
Derivatives		15,117		—		15,117		—		15,117
Financial liabilities:
Deposits:
Without stated maturities	$	3,179,754	$	3,179,754	$	—	$	—	$	3,179,754
With stated maturities		730,109		—		731,029		—		731,029
Securities sold under agreement to repurchase		15,996		15,996		—		—		15,996
Short term borrowings		187,522		187,522		—		—		187,522
Interest payable		2,180		631		1,549		—		2,180
Long-term debt		139,375		—		138,578		—		138,578
Derivatives		5,480		—		5,480		—		5,480

			Fair Value
December 31, 2017	Carrying amount		Level 1		Level 2		Level 3		Total
Financial assets:
Cash and cash equivalents	$	119,751	$	119,751	$	—	$	—	$	119,751
Investment securities		543,992		—		540,388		3,604		543,992
Federal Home Loan Bank Stock		11,412	N/A		N/A		N/A		N/A
Loans, net		3,142,870		—		3,064,373		77,027		3,141,400
Loans held for sale		526,185		—		526,185		—		526,185
Interest receivable		13,069		—		13,069		—		13,069
Mortgage servicing rights, net		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

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 June 30, 2018 are presented in the following tables:

At June 30, 2018	Quoted prices in active markets for identical assets (liabilities) (level 1)		Significant other observable inputs (level 2)		Significant unobservable inputs (level 3)		Total
Recurring valuations:
Financial assets:
Investment securities:
U.S. government agency securities	$	—	$	983	$	—	$	983
Mortgage-backed securities		—		477,974		—		477,974
Municipals, tax-exempt		—		122,247		—		122,247
Treasury securities		—		7,156		—		7,156
Equity securities		—		3,075		—		3,075
Total	$	—	$	611,435	$	—	$	611,435
Loans held for sale		—		374,916		—		374,916
Mortgage servicing rights		—		—		109,449		109,449
Derivatives		—		15,117		—		15,117
Financial Liabilities:
Derivatives	$	—	$	5,480	$	—	$	5,480

The balances and levels of the assets measured at fair value on a recurring basis at December 31, 2017 are presented in the following tables:

At December 31, 2017	Quoted prices in active markets for identical assets (liabilities) (level 1)		Significant other observable inputs (level 2)		Significant unobservable inputs (level 3)		Total
Recurring valuations:
Financial assets:
Available-for-sale securities:
U.S. government agency securities	$	—	$	986	$	—	$	986
Mortgage-backed securities		—		418,781		—		418,781
Municipals, tax-exempt		—		109,251		—		109,251
Treasury securities		—		7,252		—		7,252
Equity securities		—		4,118		3,604		7,722
Total	$	—	$	540,388	$	3,604	$	543,992
Loans held for sale		—		526,185		—		526,185
Mortgage servicing rights		—		—		76,107		76,107
Derivatives		—		9,690		—		9,690
Financial Liabilities:
Derivatives	$	—	$	1,699	$	—	$	1,699

Balances and Levels of Assets Measured at Fair Value on Non-recurring Basis

The balances and levels of the assets measured at fair value on a non-recurring basis at June 30, 2018 are presented in the following tables:

At June 30, 2018	Quoted prices in active markets for identical assets (liabilities) (level 1)		Significant other observable inputs (level 2)		Significant unobservable inputs (level 3)		Total
Non-recurring valuations:
Financial assets:
Other real estate owned	$	—	$	—	$	798	$	798
Impaired loans:
Commercial and industrial		—		—		107		107
Construction
Residential real estate:
1-4 family mortgage		—		—		144		144
Commercial real estate:		—		—		—		—
Owner occupied		—		—		180		180
Non-owner occupied		—		—		—		—
Consumer and other		—		—		—		—
Total	$	—	$	—	$	431	$	431

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 tables:

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

Summary of Changes in Fair Value on Available-for-Sale Securities Measured at Fair Value on Recurring Basis using Significant Unobservable Inputs or Level 3 Inputs

The following table summarizes changes in fair value on available-for-sale securities measured at fair value on a recurring basis using significant unobservable inputs, or Level 3 inputs, during the three and six months ended June 30, 2018 and 2017.

					Available-for-sale securities
	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018			2017
Balance at beginning of period	$	—	$	4,549	$	3,604		$	4,549
Reclassification of equity securities without a readily determinable fair value to other assets⁽¹⁾		—		—		(3,604	)		—
Balance at end of period	$	—	$	4,549	$	—		$	4,549

(1)	See Note 1, “Basis of Presentation” in the Notes to the consolidated financial statements for additional details regarding the adoption of ASU 2016-01, Recognition and Measurement of Financial Assets and Liabilities.

Information About Significant Unobservable Inputs (Level 3) Used in Valuation of Assets Measured at Fair Value on Nonrecurring Basis

The following table presents information as of June 30, 2018 about significant unobservable inputs (Level 3) used in the valuation of assets measured at fair value on a nonrecurring basis:

Financial instrument

Fair Value

Valuation technique

Significant Unobservable inputs

Range of

inputs

Impaired loans

$

431

Valuation of collateral

Discount for comparable sales

0%-30%

Other real estate owned

$

798

Appraised value of property less costs to sell

Discount for costs to sell

0%-15%

The following table presents information as of December 31, 2017 about significant unobservable inputs (Level 3) used in the valuation of assets measured at fair value on a nonrecurring basis:

Financial instrument

Fair Value

Valuation technique

Significant Unobservable inputs

Range of

inputs

Impaired loans

$

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%

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 June 30, 2018 and December 31, 2017:

June 30, 2018	Aggregate fair value		Aggregate Unpaid Principal Balance		Difference
Mortgage loans held for sale measured at fair value	$	374,916	$	364,063	$	10,853
Past due loans of 90 days or more		—		—		—
Nonaccrual loans		—		—		—

December 31, 2017
Mortgage loans held for sale measured at fair value	$	482,089	$	467,039	$	15,050
Past due loans of 90 days or more		320		320		—
Nonaccrual loans		741		741		—

Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Schedule of Segment Financial Information

The following tables provides segment financial information for the three and six months ended June 30, 2018 and 2017 follows:

Three Months Ended June 30, 2018	Banking		Mortgage			Consolidated
Net interest income	$	51,669	$	(152	)	$	51,517
Provision for loan loss		1,063		—			1,063
Mortgage banking income		6,894		23,428			30,322
Change in fair value of mortgage servicing rights⁽¹⁾		—		(1,778	)		(1,778	)
Other noninterest income		7,164		—			7,164
Depreciation		990		142			1,132
Amortization of intangibles		802		—			802
Other noninterest mortgage banking expense		5,649		19,440			25,089
Other noninterest expense		29,280		—			29,280
Income before income taxes		27,943		1,916			29,859
Income tax expense							7,794
Net income							22,065
Total assets	$	4,443,469	$	479,780		$	4,923,249
Goodwill		137,090		100			137,190
(1)Included in mortgage banking income, net of hedging gains/losses, on the Consolidated Unaudited Statements of Income.

Three Months Ended June 30, 2017	Banking			Mortgage			Consolidated
Net interest income	$	29,999		$	428		$	30,427
Provision for loan loss		(865	)		—			(865	)
Mortgage banking income		7,118			24,961			32,079
Change in fair value of mortgage servicing rights⁽¹⁾		—			(1,840	)		(1,840	)
Other noninterest income		5,418			—			5,418
Depreciation		861			130			991
Amortization of intangibles		123			—			123
Loss on sale of mortgage servicing rights		—			249			249
Other noninterest mortgage banking expense		5,368			19,423			24,791
Other noninterest expense⁽²⁾		22,982			—			22,982
Income before income taxes		14,066			3,747			17,813
Income tax expense								6,574
Net income								11,239
Total assets	$	2,878,437		$	468,133		$	3,346,570
Goodwill		46,767			100			46,867

(1)	Included in mortgage banking income on the Consolidated Unaudited Statements of Income.

(2)	Included $767 in merger and conversion expenses related to the merger with the Clayton Banks.

Six Months Ended June 30, 2018	Banking		Mortgage			Consolidated
Net interest income	$	100,440	$	(494	)	$	99,946
Provision for loan loss		1,380		—			1,380
Mortgage banking income		13,002		45,504			58,506
Net, change in fair value of mortgage servicing rights⁽¹⁾		—		(3,491	)		(3,491	)
Other noninterest income		13,968		—			13,968
Depreciation		1,968		270			2,238
Amortization of intangibles		1,655		—			1,655
Other noninterest mortgage banking expense		10,746		38,222			48,968
Other noninterest expense⁽²⁾		59,593		—			59,593
Income before income taxes		52,068		3,027			55,095
Income tax expense							13,276
Net income							41,819
Total assets	$	4,443,469	$	479,780		$	4,923,249
Goodwill		137,090		100			137,190

(1)	Included in mortgage banking income on the Consolidated Unaudited Statements of Income.

(2)	Included $1,193 in merger and conversion expenses related to the merger with the Clayton Banks.

Six Months Ended June 30, 2017	Banking			Mortgage			Consolidated
Net interest income	$	59,855		$	823		$	60,678
Provision for loan loss		(1,122	)		—			(1,122	)
Mortgage banking income		12,784			44,876			57,660
Net, change in fair value of mortgage servicing rights⁽¹⁾		—			(2,341	)		(2,341	)
Other noninterest income		11,425			—			11,425
Depreciation and amortization		1,725			268			1,993
Amortization of intangibles		515			—			515
Loss on sale of mortgage servicing rights		—			249			249
Other noninterest mortgage banking expense		10,204			36,955			47,159
Other noninterest expense⁽²⁾		45,637			—			45,637
Income before income taxes		27,105			5,886			32,991
Income tax expense								11,999
Net income								20,992
Total assets	$	2,878,437		$	468,133		$	3,346,570
Goodwill		46,767			100			46,867

(1)	Included in mortgage banking income, net of hedging gains/losses, on the Consolidated Unaudited Statements of Income.

(2)	Included $1,254 in merger and conversion expenses related to the merger with the Clayton Banks.

Minimum Capital Requirements (Tables)

6 Months Ended

Jun. 30, 2018

Banking And Thrift [Abstract]

Schedule of Actual and Required Capital Amounts and Ratios

Actual and required capital amounts and ratios are presented below at period-end:

	Actual					For capital adequacy purposes					Minimum Capital adequacy with capital buffer					To be well capitalized under prompt corrective action provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio			Amount		Ratio
June 30, 2018
Total Capital (to risk-weighted assets)
FB Financial Corporation	$	524,655		11.9	%	$	352,709		8.0	%	$	435,375		9.9	%	N/A		N/A
FirstBank		497,123		11.3	%		351,945		8.0	%		434,433		9.9	%	$	439,932		10.0	%
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation	$	498,308		11.3	%	$	264,588		6.0	%	$	347,272		7.9	%	N/A		N/A
FirstBank		470,776		10.7	%		263,987		6.0	%		346,482		7.9	%	$	263,987		6.0	%
Tier 1 Capital (to average assets)
FB Financial Corporation	$	498,308		10.9	%	$	182,865		4.0	%	N/A		N/A			N/A		N/A
FirstBank		470,776		10.2	%		184,618		4.0	%	N/A		N/A			$	230,773		5.0	%
Common Equity Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation	$	468,308		10.6	%	$	198,810		4.5	%	$	281,648		6.4	%	N/A		N/A
FirstBank		470,776		10.7	%		197,990		4.5	%		280,486		6.4	%	$	285,985		6.5	%

	Actual					For capital adequacy purposes					Minimum Capital adequacy with capital buffer					To be well capitalized under prompt corrective action provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio			Amount		Ratio
December 31, 2017
Total Capital (to risk-weighted assets)
FB Financial Corporation	$	496,422		12.0	%	$	330,672		8.0	%	$	382,340		9.3	%	N/A		N/A
FirstBank		466,102		11.3	%		329,984		8.0	%		381,544		9.3	%	$	412,480		10.0	%
Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation	$	472,381		11.4	%	$	247,969		6.0	%	$	299,629		7.3	%	N/A		N/A
FirstBank		442,061		10.7	%		247,422		6.0	%		298,968		7.3	%	$	247,422		6.0	%
Tier 1 Capital (to average assets)
FB Financial Corporation	$	472,381		10.5	%	$	180,643		4.0	%	N/A		N/A			N/A		N/A
FirstBank		442,061		9.8	%		180,987		4.0	%	N/A		N/A			$	226,234		5.0	%
Common Equity Tier 1 Capital (to risk-weighted assets)
FB Financial Corporation	$	442,381		10.7	%	$	185,874		4.5	%	$	237,506		5.8	%	N/A		N/A
FirstBank		442,061		10.7	%		185,567		4.5	%		237,113		5.8	%	$	268,041		6.5	%

Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

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, excluding cash-settled EBI units discussed above, outstanding at June 30, 2018 and 2017:

	Six Months Ended June 30,
	2018					2017
	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 (unvested)		1,214,325		$	19.97		1,200,848		$	19.00
Grants		110,466			40.02		97,893			33.88
Released and distributed (vested)		(181,903	)		22.09		(70,819	)		19.00
Forfeited/expired		(7,060	)		21.81		(1,021	)		19.00
Balance at end of period (unvested)		1,135,828		$	21.59		1,226,901		$	19.67

Related party transactions (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of Loans Analysis to Executive Officers, Certain Management, Bank Directors and Their Affiliates

An analysis of loans to executive officers, certain management, and directors of the Bank and their affiliates follows:

Loans outstanding at January 1, 2018	$	21,012
New loans and advances		1,611
Repayments		(4,657	)
Loans outstanding at June 30, 2018	$	17,966

Basis of Presentation - Additional Information (Details)			3 Months Ended	6 Months Ended
	Jul. 19, 2018 USD ($) $ / shares	Jan. 01, 2018 USD ($)	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) Branch $ / shares	Aug. 07, 2018 USD ($)	Dec. 31, 2017 USD ($)
Class Of Stock [Line Items]
Quarterly dividends declared, per share \| $ / shares			$ 0.06	$ 0.06
ASC 860-50-35, Transfers and Servicing
Class Of Stock [Line Items]
Percent of remaining principal allowed to buy back under GNMA optional repurchase programs				100.00%
ASU 2014-09
Class Of Stock [Line Items]
Adjustment to retained earnings		$ 0
ASU 2016-01
Class Of Stock [Line Items]
Adjustment to retained earnings		$ 109,000
GNMA
Class Of Stock [Line Items]
Residential mortgage loans transferred by bank			$ 0	$ 0		$ 43,035,000
Delinquent GNMA loans			$ 52,212,000	$ 52,212,000
Federal Home Loan Bank of Cincinnati
Class Of Stock [Line Items]
Line of credit						$ 300,000,000
Subsequent Event
Class Of Stock [Line Items]
Quarterly dividends declared, per share \| $ / shares	$ 0.06
Dividends , Date of record	Jul. 31, 2018
Dividends, Date to be paid	Aug. 15, 2018
Dividends, Date declared	Jul. 19, 2018
Dividends declared, Total	$ 1,909,000
Subsequent Event \| Federal Home Loan Bank of Cincinnati
Class Of Stock [Line Items]
Line of credit					$ 800,000,000
James W. Ayers
Class Of Stock [Line Items]
Percentage of voting power of issued and outstanding common stock			44.00%	44.00%
Secondary Offering \| Common Stock
Class Of Stock [Line Items]
Shares issued during period \| shares			3,680,000
FirstBank
Class Of Stock [Line Items]
Number of bank branches \| Branch				56

Basis of Presentation - Schedule of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic earnings per share calculation:
Net income	$ 22,065	$ 11,239	$ 41,819	$ 20,992
Dividends paid on and undistributed earnings allocated to participating securities	(117)		(223)
Earnings attributable to common shareholders	$ 21,948	$ 11,239	$ 41,596	$ 20,992
Weighted-average basic shares outstanding	30,678,732	25,741,968	30,646,189	24,944,633
Basic earnings per share	$ 0.72	$ 0.44	$ 1.36	$ 0.84
Diluted earnings per share:
Earnings attributable to common shareholders	$ 21,948	$ 11,239	$ 41,596	$ 20,992
Weighted-average basic shares outstanding	30,678,732	25,741,968	30,646,189	24,944,633
Weighted-average diluted shares contingently issuable	615,312	559,490	629,657	505,786
Weighted-average diluted shares outstanding	31,294,044	26,301,458	31,275,846	25,450,419
Diluted earnings per share	$ 0.70	$ 0.43	$ 1.33	$ 0.82

Mergers and acquisitions - Additional Information (Details)

3 Months Ended

6 Months Ended

Jul. 31, 2017

USD ($)

Feb. 08, 2017

USD ($)

shares

Jun. 30, 2018

USD ($)

Jun. 30, 2017

USD ($)

Jun. 30, 2018

USD ($)

Jun. 30, 2017

USD ($)

Dec. 31, 2017

USD ($)

Jul. 30, 2017

BankingOffice

Business Acquisition [Line Items]

Goodwill

$ 137,190,000

$ 46,867,000

$ 137,190,000

$ 46,867,000

$ 137,190,000

Merger and conversion

767,000

1,193,000

1,254,000

Business combination, deferred taxes

19,996,000

$ 19,996,000

$ 17,768,000

Clayton Banks

Business Acquisition [Line Items]

Business acquisition, date of acquisition agreement

Feb. 08, 2017

Acquisition purchase price

$ 236,484,000

Business acquisition, shares issued | shares

1,521,200

Cash purchase price

184,200,000

^[1]

$ 184,200,000

Number of banking offices | BankingOffice

18

Goodwill

90,323,000

Merger and conversion

$ 0

$ 767,000

$ 1,193,000

$ 1,254,000

Business combination, deferred taxes

$ 0

Number of years of deductibility for income tax of the goodwill and core deposit intangible

15 years

[1]	Amount was deposited into an interest-bearing account with the Bank in the name of the Seller as of July 31, 2017.

Mergers and acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - Clayton Banks
$ in Thousands

Jul. 31, 2017

USD ($)

^[1]

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

$ 146,161

[1]	Amounts include certain reclassifications of opening balances to conform to the Company’s presentation.

Mergers and acquisitions - Schedule of Consideration Paid and Allocation of Purchase Price to Net Assets Acquired (Details) - USD ($)
$ / shares in Units, $ in Thousands

Jul. 31, 2017

Feb. 08, 2017

Jun. 30, 2018

Dec. 31, 2017

Jun. 30, 2017

Preliminary allocation of consideration paid:

Goodwill

$ 137,190

$ 46,867

Total consideration paid

$ 236,484

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

^[1]

$ 184,200

Total consideration paid

236,484

$ 236,484

Preliminary allocation of consideration paid:

Fair value of net assets acquired including identifiable intangible assets

^[2]

146,161

Goodwill

$ 90,323

Clayton Banks | Common Stock

Equity consideration

Common stock issued

1,521,200

[1]	Amount was deposited into an interest-bearing account with the Bank in the name of the Seller as of July 31, 2017.
[2]	Amounts include certain reclassifications of opening balances to conform to the Company’s presentation.

Mergers and acquisitions - Business Acquisition, Pro Forma Information (Details) - Clayton Banks - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Business Acquisition [Line Items]
Net interest income	$ 47,404	$ 94,091
Total revenues	84,545	163,826
Net income	$ 17,290	$ 34,018

Investment Securities - Summary of Amortized Cost of Securities and Fair Values (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Amortized cost		$ 548,898
Gross unrealized gains		3,067
Gross unrealized losses		(7,973)
Available-for-sale securities, at fair value		543,992
Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	$ 625,672	541,028
Gross unrealized gains	1,641	3,066
Gross unrealized losses	(18,953)	(7,824)
Available-for-sale securities, at fair value	608,360	536,270
Debt Securities \| U.S. Government Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	999	999
Gross unrealized losses	(16)	(13)
Available-for-sale securities, at fair value	983	986
Debt Securities \| Mortgage-backed Securities - Residential
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	494,599	425,557
Gross unrealized gains	169	374
Gross unrealized losses	(16,794)	(7,150)
Available-for-sale securities, at fair value	477,974	418,781
Debt Securities \| Municipals, Tax Exempt
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	122,710	107,127
Gross unrealized gains	1,472	2,692
Gross unrealized losses	(1,935)	(568)
Available-for-sale securities, at fair value	122,247	109,251
Debt Securities \| Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized cost	7,364	7,345
Gross unrealized losses	(208)	(93)
Available-for-sale securities, at fair value	$ 7,156	7,252
Equity and Other Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized cost		7,870
Gross unrealized gains		1
Gross unrealized losses		(149)
Available-for-sale securities, at fair value		$ 7,722

Investment Securities - Additional Information (Details)		3 Months Ended		6 Months Ended
	Jan. 01, 2018 USD ($)	Jun. 30, 2018 USD ($) security	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) security	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) security
Schedule Of Available For Sale Securities [Line Items]
Equity securities, at fair value		$ 3,075,000		$ 3,075,000		$ 7,722,000
Net loss on changes in fair value of securities		43,000		81,000
Securities pledged, carrying amount		433,780,000		$ 433,780,000		$ 337,604,000
Recognized gains on early call of available-for-sale securities		$ 1,000			$ 1,000
Number of securities in securities portfolio \| security		329		329		294
Number of securities in securities portfolio, unrealized loss position \| security		181		181		124
Other-than-temporary impairment recorded by the company		$ 0	$ 0	$ 0	$ 0
ASU 2016-01
Schedule Of Available For Sale Securities [Line Items]
Other assets reclassified from other securities	$ 3,604,000
Other securities reclassified to other assets	$ 3,604,000

Investment Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Amortized cost, Due in one year or less	$ 11,991	$ 905
Amortized cost, Due in one to five years	20,026	28,332
Amortized cost, Due in five to ten years	18,795	19,218
Amortized cost, Due in over ten years	80,261	67,016
Amortized cost, Total	131,073	115,471
Total debt securities, Amortized cost	625,672	541,028
Fair value, Due in one year or less	12,195	925
Fair value, Due in one to five years	20,083	28,878
Fair value, Due in five to ten years	18,769	19,588
Fair value, Due in over ten years	79,339	68,098
Fair value, Total	130,386	117,489
Available-for-sale debt securities, at fair value	608,360	536,270
Mortgage-backed Securities - Residential
Schedule Of Available For Sale Securities [Line Items]
Total debt securities, Amortized cost	494,599	425,557
Available-for-sale debt securities, at fair value	$ 477,974	$ 418,781

Investment Securities - Summary of Sales of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Available For Sale Securities Gross Realized Gain Loss [Abstract]
Proceeds from sales	$ 12,158	$ 221	$ 12,158
Gross realized gains	77		77
Gross realized losses	$ 48	$ 9	$ 48

Investment Securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Fair Value, Less than 12 months		$ 122,217
Unrealized Loss, Less than 12 months		1,174
Fair Value, 12 months or more		314,406
Unrealized Loss, 12 months or more		6,799
Fair Value, Total		436,623
Unrealized Losses, Total		7,973
Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value, Less than 12 months	$ 225,549	122,217
Unrealized Loss, Less than 12 months	5,440	1,174
Fair Value, 12 months or more	281,816	311,356
Unrealized Loss, 12 months or more	13,513	6,650
Fair Value, Total	507,365	433,573
Unrealized Losses, Total	18,953	7,824
Debt Securities \| U.S. Government Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value, 12 months or more	983	986
Unrealized Loss, 12 months or more	16	13
Fair Value, Total	983	986
Unrealized Losses, Total	16	13
Debt Securities \| Mortgage-backed Securities - Residential
Schedule Of Available For Sale Securities [Line Items]
Fair Value, Less than 12 months	185,980	107,611
Unrealized Loss, Less than 12 months	4,472	980
Fair Value, 12 months or more	261,675	290,258
Unrealized Loss, 12 months or more	12,322	6,170
Fair Value, Total	447,655	397,869
Unrealized Losses, Total	16,794	7,150
Debt Securities \| Municipals, Tax Exempt
Schedule Of Available For Sale Securities [Line Items]
Fair Value, Less than 12 months	32,413	7,354
Unrealized Loss, Less than 12 months	760	101
Fair Value, 12 months or more	19,158	20,112
Unrealized Loss, 12 months or more	1,175	467
Fair Value, Total	51,571	27,466
Unrealized Losses, Total	1,935	568
Debt Securities \| Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value, Less than 12 months	7,156	7,252
Unrealized Loss, Less than 12 months	208	93
Fair Value, Total	7,156	7,252
Unrealized Losses, Total	$ 208	93
Equity and Other Securities
Schedule Of Available For Sale Securities [Line Items]
Fair Value, 12 months or more		3,050
Unrealized Loss, 12 months or more		149
Fair Value, Total		3,050
Unrealized Losses, Total		$ 149

Loans and Allowance for Loan Losses - Loans Outstanding by Major Lending Classification (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	$ 3,415,575		$ 3,166,911
Less: Allowance for loan losses	(26,347)	$ (24,406)	(24,041)	$ (23,247)	$ (22,898)	$ (21,747)
Net loans	3,389,228		3,142,870
Commercial and Industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	813,054		715,075
Less: Allowance for loan losses	(4,747)	(4,578)	(4,461)	(5,440)	(5,402)	(5,309)
Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	522,471		448,326
Less: Allowance for loan losses	(9,023)	(7,866)	(7,135)	(5,579)	(5,598)	(4,940)
Residential Real Estate \| 1-to-4 Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	528,158		480,989
Less: Allowance for loan losses	(3,378)	(3,122)	(3,197)	(2,974)	(2,896)	(3,197)
Residential Real Estate \| Residential Line of Credit
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	208,668		194,986
Less: Allowance for loan losses	(795)	(1,165)	(944)	(1,445)	(1,514)	(1,613)
Residential Real Estate \| Multi-Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	57,344		62,374
Less: Allowance for loan losses	(391)	(449)	(434)	(513)	(508)	(504)
Commercial Real Estate \| Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	470,872		495,872
Less: Allowance for loan losses	(3,290)	(3,014)	(3,558)	(3,983)	(3,387)	(3,302)
Commercial Real Estate \| Non-Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	600,629		551,588
Less: Allowance for loan losses	(3,272)	(2,753)	(2,817)	(2,452)	(2,660)	(2,019)
Consumer and Other
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	214,379		217,701
Less: Allowance for loan losses	$ (1,451)	$ (1,459)	$ (1,495)	$ (861)	$ (933)	$ (863)

Loans and Allowance for Loan Losses - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable Recorded Investment Past Due [Line Items]
Carrying value of PCI loans	$ 78,313,000		$ 78,313,000		$ 88,835,000
Accretion of interest income			3,615,000	$ 848,000
Non-accrual loans	3,000,000		3,000,000		3,205,000
Recorded investment in troubled debt restructurings	8,603,000		8,603,000		8,604,000
Allocation to specific reserves	90,000		90,000		172,000
Commitments to lend additional amounts to customers	4,000		4,000		2,000
Payment default for loans modified as troubled debt restructurings		$ 0	0	0
Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Carrying value of PCI loans	78,313,000		78,313,000		88,835,000
Purchase accounting liquidity discount			4,212,000
Purchase accounting nonaccretable credit discount			5,236,000
Accretion of interest income	2,639,000	589,000	4,840,000	1,612,000
Total purchase accounting contribution through accretion for purchased loans	1,928,000	$ 848,000	3,615,000	$ 2,008,000
Non-accrual loans	0		0		0
Non-Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Purchase accounting liquidity discount			3,018,000
Purchase accounting accretable credit discount			9,337,000
Federal Reserve \| Borrower in Custody Program
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	1,218,505,000		1,218,505,000		724,312,000
Federal Home Loan Bank of Cincinnati \| Qualifying Residential Mortgage Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	598,522,000		598,522,000		761,197,000
Federal Home Loan Bank of Cincinnati \| Qualifying Commercial Mortgage Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Gross loans	$ 539,621,000		$ 539,621,000		$ 207,370,000

Loans and Allowance for Loan Losses - Changes in Accretable Yield on Purchase Credit Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounts Notes And Loans Receivable [Line Items]
Purchased Credit Impaired Accretable yield, Accretion			$ 3,615	$ 848
Purchased Credit Impaired
Accounts Notes And Loans Receivable [Line Items]
Purchased Credit Impaired Accretable yield, Beginning balance	$ (16,955)	$ (2,142)	(17,682)	(2,444)
Purchased Credit Impaired Accretable yield, Principal reductions/ pay-offs	(2,158)	(292)	(3,452)	(990)
Purchased Credit Impaired Accretable yield, Recoveries				(23)
Purchased Credit Impaired Accretable yield, Accretion	2,639	589	4,840	1,612
Purchased Credit Impaired Accretable yield, Other changes	(3,695)		(3,875)
Purchased Credit Impaired Accretable yield, Ending balance	$ (20,169)	$ (1,845)	$ (20,169)	$ (1,845)

Loans and Allowance for Loan Losses - Allowance for Loan Losses by Portfolio Segment and Related Investment in Loans Net of Unearned Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	$ 24,406	$ 22,898	$ 24,041	$ 21,747
Provision for loan losses	1,063	(865)	1,380	(1,122)
Recoveries of loans previously charged-off	1,299	2,005	2,008	3,855
Loans charged off	(421)	(791)	(1,082)	(1,233)
Ending balance	26,347	23,247	26,347	23,247
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	4,578	5,402	4,461	5,309
Provision for loan losses	39	(1,342)	241	(1,163)
Recoveries of loans previously charged-off	135	1,511	270	1,594
Loans charged off	(5)	(131)	(225)	(300)
Ending balance	4,747	5,440	4,747	5,440
Construction
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	7,866	5,598	7,135	4,940
Provision for loan losses	310	(48)	789	587
Recoveries of loans previously charged-off	862	29	1,114	58
Loans charged off	(15)		(15)	(6)
Ending balance	9,023	5,579	9,023	5,579
Residential Real Estate \| 1-to-4 Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	3,122	2,896	3,197	3,197
Provision for loan losses	218	99	188	(140)
Recoveries of loans previously charged-off	43	14	58	40
Loans charged off	(5)	(35)	(65)	(123)
Ending balance	3,378	2,974	3,378	2,974
Residential Real Estate \| Residential Line of Credit
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	1,165	1,514	944	1,613
Provision for loan losses	(414)	(29)	(200)	(184)
Recoveries of loans previously charged-off	44	155	71	211
Loans charged off		(195)	(20)	(195)
Ending balance	795	1,445	795	1,445
Residential Real Estate \| Multi-Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	449	508	434	504
Provision for loan losses	(58)	5	(43)	9
Ending balance	391	513	391	513
Commercial Real Estate \| Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	3,014	3,387	3,558	3,302
Provision for loan losses	168	585	(399)	666
Recoveries of loans previously charged-off	108	11	131	15
Ending balance	3,290	3,983	3,290	3,983
Commercial Real Estate \| Non-Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	2,753	2,660	2,817	2,019
Provision for loan losses	519	(210)	404	(1,208)
Recoveries of loans previously charged-off		2	51	1,641
Ending balance	3,272	2,452	3,272	2,452
Consumer and Other
Accounts Notes And Loans Receivable [Line Items]
Beginning balance	1,459	933	1,495	863
Provision for loan losses	281	75	400	311
Recoveries of loans previously charged-off	107	283	313	296
Loans charged off	(396)	(430)	(757)	(609)
Ending balance	$ 1,451	$ 861	$ 1,451	$ 861

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	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	$ 185		$ 191
Collectively evaluated for impairment	25,479		23,850
Acquired with deteriorated credit quality	683
Ending balance	26,347	$ 24,406	24,041	$ 23,247	$ 22,898	$ 21,747
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	49		20
Collectively evaluated for impairment	4,685		4,441
Acquired with deteriorated credit quality	13
Ending balance	4,747	4,578	4,461	5,440	5,402	5,309
Construction
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	8,998		7,135
Acquired with deteriorated credit quality	25
Ending balance	9,023	7,866	7,135	5,579	5,598	4,940
Residential Real Estate \| 1-to-4 Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	12		18
Collectively evaluated for impairment	3,227		3,179
Acquired with deteriorated credit quality	139
Ending balance	3,378	3,122	3,197	2,974	2,896	3,197
Residential Real Estate \| Residential Line of Credit
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	795		944
Ending balance	795	1,165	944	1,445	1,514	1,613
Residential Real Estate \| Multi-Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	391		434
Ending balance	391	449	434	513	508	504
Commercial Real Estate \| Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	124		120
Collectively evaluated for impairment	3,082		3,438
Acquired with deteriorated credit quality	84
Ending balance	3,290	3,014	3,558	3,983	3,387	3,302
Commercial Real Estate \| Non-Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment			33
Collectively evaluated for impairment	2,894		2,784
Acquired with deteriorated credit quality	378
Ending balance	3,272	2,753	2,817	2,452	2,660	2,019
Consumer and Other
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	1,407		1,495
Acquired with deteriorated credit quality	44
Ending balance	$ 1,451	$ 1,459	$ 1,495	$ 861	$ 933	$ 863

Loans and Allowance for Loan Losses - Amount of Loans by Loan Category Broken Between Loans Individually and Collectively Evaluated for Impairment and Acquired with Deteriorated Credit Quality (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	$ 9,263	$ 9,373
Collectively evaluated for impairment	3,327,999	3,068,703
Acquired with deteriorated credit quality	78,313	88,835
Gross loans	3,415,575	3,166,911
Commercial and Industrial
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,186	1,579
Collectively evaluated for impairment	809,102	711,352
Acquired with deteriorated credit quality	1,766	2,144
Gross loans	813,054	715,075
Construction
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,281	1,289
Collectively evaluated for impairment	514,129	439,309
Acquired with deteriorated credit quality	7,061	7,728
Gross loans	522,471	448,326
Residential Real Estate \| 1-to-4 Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,503	1,262
Collectively evaluated for impairment	505,643	456,229
Acquired with deteriorated credit quality	21,012	23,498
Gross loans	528,158	480,989
Residential Real Estate \| Residential Line of Credit
Accounts Notes And Loans Receivable [Line Items]
Collectively evaluated for impairment	208,668	194,986
Gross loans	208,668	194,986
Residential Real Estate \| Multi-Family Mortgage
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	951	978
Collectively evaluated for impairment	56,377	61,376
Acquired with deteriorated credit quality	16	20
Gross loans	57,344	62,374
Commercial Real Estate \| Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	2,266	2,520
Collectively evaluated for impairment	460,281	481,390
Acquired with deteriorated credit quality	8,325	11,962
Gross loans	470,872	495,872
Commercial Real Estate \| Non-Owner Occupied
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	1,049	1,720
Collectively evaluated for impairment	581,531	531,704
Acquired with deteriorated credit quality	18,049	18,164
Gross loans	600,629	551,588
Consumer and Other
Accounts Notes And Loans Receivable [Line Items]
Individually evaluated for impairment	27	25
Collectively evaluated for impairment	192,268	192,357
Acquired with deteriorated credit quality	22,084	25,319
Gross loans	$ 214,379	$ 217,701

Loans and Allowance for Loan Losses - Credit Quality Indicators by Portfolio Class (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	$ 3,337,262	$ 3,078,076
Purchased credit impaired loans	78,313	88,835
Total loans	3,415,575	3,166,911
Pass
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	3,183,477	2,940,174
Total loans	3,183,477	2,940,174
Watch
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	122,964	114,401
Purchased credit impaired loans	50,667	56,848
Total loans	173,631	171,249
Substandard
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	30,821	23,501
Purchased credit impaired loans	27,646	31,987
Total loans	58,467	55,488
Commercial and Industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	811,288	712,931
Purchased credit impaired loans	1,766	2,144
Total loans	813,054	715,075
Commercial and Industrial \| Pass
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	746,253	657,595
Commercial and Industrial \| Watch
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	59,476	50,946
Purchased credit impaired loans	1,187	1,499
Commercial and Industrial \| Substandard
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	5,559	4,390
Purchased credit impaired loans	579	645
Construction
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	515,410	440,598
Purchased credit impaired loans	7,061	7,728
Total loans	522,471	448,326
Construction \| Pass
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	499,370	431,242
Construction \| Watch
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	14,278	7,388
Purchased credit impaired loans	3,332	3,324
Construction \| Substandard
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	1,762	1,968
Purchased credit impaired loans	3,729	4,404
Residential Real Estate \| 1-to-4 Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	507,146	457,491
Purchased credit impaired loans	21,012	23,498
Total loans	528,158	480,989
Residential Real Estate \| Residential Line of Credit
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	208,668	194,986
Total loans	208,668	194,986
Residential Real Estate \| Multi-Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	57,328	62,354
Purchased credit impaired loans	16	20
Total loans	57,344	62,374
Residential Real Estate \| Pass \| 1-to-4 Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	490,856	440,202
Residential Real Estate \| Pass \| Residential Line of Credit
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	205,614	192,427
Residential Real Estate \| Pass \| Multi-Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	56,245	61,234
Residential Real Estate \| Watch \| 1-to-4 Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	8,625	9,522
Purchased credit impaired loans	16,721	20,284
Residential Real Estate \| Watch \| Residential Line of Credit
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	1,632	1,184
Residential Real Estate \| Watch \| Multi-Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	133	142
Residential Real Estate \| Substandard \| 1-to-4 Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	7,665	7,767
Purchased credit impaired loans	4,291	3,214
Residential Real Estate \| Substandard \| Residential Line of Credit
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	1,422	1,375
Residential Real Estate \| Substandard \| Multi-Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	950	978
Purchased credit impaired loans	16	20
Commercial Real Estate \| Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	462,547	483,910
Purchased credit impaired loans	8,325	11,962
Total loans	470,872	495,872
Commercial Real Estate \| Non-Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	582,580	533,424
Purchased credit impaired loans	18,049	18,164
Total loans	600,629	551,588
Commercial Real Estate \| Pass \| Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	434,025	451,140
Commercial Real Estate \| Pass \| Non-Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	565,195	517,253
Commercial Real Estate \| Watch \| Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	20,435	28,308
Purchased credit impaired loans	4,488	4,631
Commercial Real Estate \| Watch \| Non-Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	16,096	14,199
Purchased credit impaired loans	7,465	7,359
Commercial Real Estate \| Substandard \| Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	8,087	4,462
Purchased credit impaired loans	3,837	7,331
Commercial Real Estate \| Substandard \| Non-Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	1,289	1,972
Purchased credit impaired loans	10,584	10,805
Consumer and Other
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	192,295	192,382
Purchased credit impaired loans	22,084	25,319
Total loans	214,379	217,701
Consumer and Other \| Pass
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	185,919	189,081
Consumer and Other \| Watch
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	2,289	2,712
Purchased credit impaired loans	17,474	19,751
Consumer and Other \| Substandard
Financing Receivable Allowance For Credit Losses [Line Items]
Loans, excluding purchased credit impaired loans	4,087	589
Purchased credit impaired loans	$ 4,610	$ 5,568

Loans and Allowance for Loan Losses - Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	$ 3,415,575	$ 3,166,911
Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	78,313	88,835
Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	7,174	8,101
30-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	10,994	15,063
90 Days or More and Accruing Interest
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	1,639	1,996
Financing Receivables Current
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	3,317,455	3,052,916
Commercial and Industrial
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	813,054	715,075
Commercial and Industrial \| Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	1,766	2,144
Commercial and Industrial \| Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	707	533
Commercial and Industrial \| 30-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	3,138	5,859
Commercial and Industrial \| 90 Days or More and Accruing Interest
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	145	90
Commercial and Industrial \| Financing Receivables Current
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	807,298	706,449
Construction
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	522,471	448,326
Construction \| Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	7,061	7,728
Construction \| Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	328	300
Construction \| 30-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	850	1,412
Construction \| 90 Days or More and Accruing Interest
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	193	241
Construction \| Financing Receivables Current
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	514,039	438,645
Residential Real Estate \| 1-to-4 Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	528,158	480,989
Residential Real Estate \| 1-to-4 Family Mortgage \| Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	21,012	23,498
Residential Real Estate \| 1-to-4 Family Mortgage \| Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	2,293	2,548
Residential Real Estate \| Residential Line of Credit
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	208,668	194,986
Residential Real Estate \| Residential Line of Credit \| Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	507	699
Residential Real Estate \| Multi-Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	57,344	62,374
Residential Real Estate \| Multi-Family Mortgage \| Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	16	20
Residential Real Estate \| 30-89 Days Past Due \| 1-to-4 Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	3,605	4,678
Residential Real Estate \| 30-89 Days Past Due \| Residential Line of Credit
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	1,345	527
Residential Real Estate \| 90 Days or More and Accruing Interest \| 1-to-4 Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	859	956
Residential Real Estate \| 90 Days or More and Accruing Interest \| Residential Line of Credit
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	254	134
Residential Real Estate \| Financing Receivables Current \| 1-to-4 Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	500,389	449,309
Residential Real Estate \| Financing Receivables Current \| Residential Line of Credit
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	206,562	193,626
Residential Real Estate \| Financing Receivables Current \| Multi-Family Mortgage
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	57,328	62,354
Commercial Real Estate \| Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	470,872	495,872
Commercial Real Estate \| Owner Occupied \| Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	8,325	11,962
Commercial Real Estate \| Owner Occupied \| Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	2,052	2,582
Commercial Real Estate \| Non-Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	600,629	551,588
Commercial Real Estate \| Non-Owner Occupied \| Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	18,049	18,164
Commercial Real Estate \| Non-Owner Occupied \| Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	1,212	1,371
Commercial Real Estate \| 30-89 Days Past Due \| Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	249	521
Commercial Real Estate \| 30-89 Days Past Due \| Non-Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Loans		121
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	460,246	480,449
Commercial Real Estate \| Financing Receivables Current \| Non-Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	581,368	531,932
Consumer and Other
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	214,379	217,701
Consumer and Other \| Purchased Credit Impaired
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	22,084	25,319
Consumer and Other \| Non Accruing
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	75	68
Consumer and Other \| 30-89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	1,807	1,945
Consumer and Other \| 90 Days or More and Accruing Interest
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	188	217
Consumer and Other \| Financing Receivables Current
Financing Receivable Recorded Investment Past Due [Line Items]
Loans	$ 190,225	$ 190,152

Loans and Allowance for Loan Losses - Impaired Loans Recognized, Segregated by Class (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable Impaired [Line Items]
Impaired loans with related allowance, Recorded investment	$ 1,094		$ 1,094		$ 1,235
Impaired loans with related allowance, Unpaid principal	1,460		1,460		1,821
Impaired loans with related allowance, Related allowance	185		185		191
Impaired loan with no related allowance, Recorded investment	8,169		8,169		8,138
Impaired loan with no related allowance, Unpaid principal	9,821		9,821		9,451
Total impaired loans, Recorded investment	9,263		9,263		9,373
Total impaired loans, Unpaid principal	11,281		11,281		11,272
Impaired loan with no related allowance, Average recorded investment	8,110	$ 7,363	8,155	$ 8,741
Impaired loan with no related allowance, Interest income recognized (cash basis)	121	66	231	147
Impaired loans with related allowance, Average recorded investment	1,033	1,957	1,165	2,344
Impaired loans with related allowance, Interest income recognized (cash basis)	25	15	36	32
Total impaired loans, Average recorded investment	9,143	9,320	9,320	11,085
Total impaired loans, Interest income recognized (cash basis)	146	81	267	179
Commercial and Industrial
Financing Receivable Impaired [Line Items]
Impaired loans with related allowance, Recorded investment	153		153		53
Impaired loans with related allowance, Unpaid principal	153		153		53
Impaired loans with related allowance, Related allowance	49		49		20
Impaired loan with no related allowance, Recorded investment	2,033		2,033		1,526
Impaired loan with no related allowance, Unpaid principal	2,387		2,387		1,570
Impaired loan with no related allowance, Average recorded investment	1,683	519	1,780	557
Impaired loan with no related allowance, Interest income recognized (cash basis)	43	7	59	16
Impaired loans with related allowance, Average recorded investment	103	729	103	792
Impaired loans with related allowance, Interest income recognized (cash basis)	2	5	3	10
Residential Real Estate \| 1-to-4 Family Mortgage
Financing Receivable Impaired [Line Items]
Impaired loans with related allowance, Recorded investment	187		187		194
Impaired loans with related allowance, Unpaid principal	488		488		495
Impaired loans with related allowance, Related allowance	12		12		18
Impaired loan with no related allowance, Recorded investment	1,316		1,316		1,068
Impaired loan with no related allowance, Unpaid principal	1,322		1,322		1,072
Impaired loan with no related allowance, Average recorded investment	1,309	2,106	1,192	2,232
Impaired loan with no related allowance, Interest income recognized (cash basis)	31	15	44	32
Impaired loans with related allowance, Average recorded investment	189	98	191	100
Impaired loans with related allowance, Interest income recognized (cash basis)	2		4
Residential Real Estate \| Multi-Family Mortgage
Financing Receivable Impaired [Line Items]
Impaired loan with no related allowance, Recorded investment	951		951		978
Impaired loan with no related allowance, Unpaid principal	951		951		978
Impaired loan with no related allowance, Average recorded investment	958	1,008	965	1,014
Impaired loan with no related allowance, Interest income recognized (cash basis)	12	12	24	23
Residential Real Estate \| Residential Line of Credit
Financing Receivable Impaired [Line Items]
Impaired loan with no related allowance, Average recorded investment				156
Commercial Real Estate \| Owner Occupied
Financing Receivable Impaired [Line Items]
Impaired loans with related allowance, Recorded investment	754		754		844
Impaired loans with related allowance, Unpaid principal	819		819		1,123
Impaired loans with related allowance, Related allowance	124		124		120
Impaired loan with no related allowance, Recorded investment	1,512		1,512		1,676
Impaired loan with no related allowance, Unpaid principal	2,039		2,039		2,168
Impaired loan with no related allowance, Average recorded investment	1,539	1,801	1,594	1,941
Impaired loan with no related allowance, Interest income recognized (cash basis)	28	23	60	61
Impaired loans with related allowance, Average recorded investment	670	616	799	622
Impaired loans with related allowance, Interest income recognized (cash basis)	21	8	27	20
Commercial Real Estate \| Non-Owner Occupied
Financing Receivable Impaired [Line Items]
Impaired loans with related allowance, Recorded investment					144
Impaired loans with related allowance, Unpaid principal					150
Impaired loans with related allowance, Related allowance					33
Impaired loan with no related allowance, Recorded investment	1,049		1,049		1,576
Impaired loan with no related allowance, Unpaid principal	1,781		1,781		2,325
Impaired loan with no related allowance, Average recorded investment	1,310	1,602	1,313	1,323
Impaired loan with no related allowance, Interest income recognized (cash basis)		5	7	5
Impaired loans with related allowance, Average recorded investment	71	514	72	829
Impaired loans with related allowance, Interest income recognized (cash basis)		2	2	2
Construction
Financing Receivable Impaired [Line Items]
Impaired loan with no related allowance, Recorded investment	1,281		1,281		1,289
Impaired loan with no related allowance, Unpaid principal	1,314		1,314		1,313
Impaired loan with no related allowance, Average recorded investment	1,283	302	1,285	1,493
Impaired loan with no related allowance, Interest income recognized (cash basis)	6	4	36	9
Consumer and Other
Financing Receivable Impaired [Line Items]
Impaired loan with no related allowance, Recorded investment	27		27		25
Impaired loan with no related allowance, Unpaid principal	27		27		$ 25
Impaired loan with no related allowance, Average recorded investment	28	$ 25	26	25
Impaired loan with no related allowance, Interest income recognized (cash basis)	$ 1		$ 1	1
Impaired loans with related allowance, Average recorded investment				$ 1

Loans and Allowance for Loan Losses - Financial Effect of TDRs (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($) loan	Jun. 30, 2018 USD ($) loan	Jun. 30, 2017 USD ($) loan
Financing Receivable Modifications [Line Items]
Number of loans \| loan	2	4	4
Pre-modification outstanding recorded investment	$ 887	$ 1,141	$ 1,093
Post-modification outstanding recorded investment	$ 887	$ 1,141	$ 1,093
Commercial and Industrial
Financing Receivable Modifications [Line Items]
Number of loans \| loan	2	2	1
Pre-modification outstanding recorded investment	$ 887	$ 887	$ 5
Post-modification outstanding recorded investment	$ 887	$ 887	$ 5
Residential Real Estate \| 1-to-4 Family Mortgage
Financing Receivable Modifications [Line Items]
Number of loans \| loan		1
Pre-modification outstanding recorded investment		$ 249
Post-modification outstanding recorded investment		$ 249
Consumer and Other
Financing Receivable Modifications [Line Items]
Number of loans \| loan		1
Pre-modification outstanding recorded investment		$ 5
Post-modification outstanding recorded investment		$ 5
Commercial Real Estate \| Owner Occupied
Financing Receivable Modifications [Line Items]
Number of loans \| loan			1
Pre-modification outstanding recorded investment			$ 377
Post-modification outstanding recorded investment			$ 377
Commercial Real Estate \| Non-Owner Occupied
Financing Receivable Modifications [Line Items]
Number of loans \| loan			2
Pre-modification outstanding recorded investment			$ 711
Post-modification outstanding recorded investment			$ 711

Other Real Estate Owned - Summary of Other Real Estate Owned (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Real Estate [Abstract]
Balance at beginning of period	$ 15,334	$ 6,811	$ 16,442	$ 7,403
Transfers from loans	384	274	1,014	1,162
Properties sold	(777)	(702)	(2,209)	(2,930)
(Loss) gain on sale of other real estate owned	51	77	8	948
Transferred to loans	(325)	(36)	(445)	(36)
Write-downs	(28)	(54)	(171)	(177)
Balance at end of period	$ 14,639	$ 6,370	$ 14,639	$ 6,370

Other Real Estate Owned - Additional Information (Details) - Residential Real Estate Properties - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Real Estate Properties [Line Items]
Foreclosed residential real estate properties	$ 3,320	$ 3,631
Total foreclosure proceedings in process	$ 634	$ 19

Mortgage Servicing Rights - Schedule of Changes in Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Transfers And Servicing [Abstract]
Carrying value prior to policy change	$ 93,160	$ 47,593	$ 76,107	$ 32,070
Fair value impact of change in accounting policy		1,011		1,011
Carrying value at beginning of period	93,160	47,593	76,107	33,081
Capitalization	16,304	14,646	29,814	29,659
Sales		(11,935)		(11,935)
Change in fair value:
Due to pay-offs/pay-downs	(2,207)	(532)	(5,267)	(797)
Due to change in valuation inputs or assumptions	2,192	(1,308)	8,795	(1,544)
Carrying value at end of period	$ 109,449	$ 48,464	$ 109,449	$ 48,464

Mortgage Servicing Rights - Schedule of Servicing Income and Expense Included in Mortgage Banking Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Servicing income:
Servicing income	$ 5,604	$ 2,747	$ 10,397	$ 5,495
Change in fair value of mortgage servicing rights	(15)	(1,840)	3,528	(2,341)
Change in fair value of mortgage servicing rights hedging instruments	(1,763)		(7,019)
Gross servicing income	3,826	907	6,906	3,154
Servicing expense:
Loss on sale of mortgage servicing rights		249		249
Direct servicing expenses	2,078	1,204	3,873	2,138
Gross servicing expense	2,078	1,453	3,873	2,387
Net servicing income	$ 1,748	$ (546)	$ 3,033	$ 767

Mortgage Servicing Rights - Schedule of Data and Key Economic Assumptions Related to Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Transfers And Servicing [Abstract]
Unpaid principal balance	$ 8,483,445	$ 6,529,431
Weighted-average prepayment speed (CPR)	7.63%	8.90%
Estimated impact on fair value of a 10% increase	$ (3,588)	$ (3,026)
Estimated impact on fair value of a 20% increase	$ (6,921)	$ (5,855)
Discount rate	10.23%	9.75%
Estimated impact on fair value of a 100 bp increase	$ (4,578)	$ (3,052)
Estimated impact on fair value of a 200 bp increase	$ (8,813)	$ (5,867)
Weighted-average coupon interest rate	4.06%	3.94%
Weighted-average servicing fee (basis points)	0.28%	0.28%
Weighted-average remaining maturity (in months)	322 months	335 months

Mortgage Servicing Rights - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Transfers And Servicing [Abstract]
Mortgage servicing rights sold	$ 11,935,000	$ 11,935,000
Mortgage loans serviced	$ 1,085,465,000	$ 1,085,465,000	$ 3,217,580,000
Mortgage loans serviced related to bulk sale of mortgage servicing rights			$ 0	$ 0

Income Taxes - Schedule of Allocation of Federal and State Income Taxes between Current and Deferred Portions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Current	$ 2,195	$ 4,047	$ 2,195	$ 4,047
Deferred	5,599	2,527	11,081	7,952
Total	$ 7,794	$ 6,574	$ 13,276	$ 11,999

Income Taxes - Additional Information (Details)	3 Months Ended		6 Months Ended
Income Taxes - Additional Information (Details)	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	35.00%	21.00%	35.00%
Tax periods open for examination			2013

Income Taxes - Schedule of Differences in Federal Income Tax Expense and State Tax Expense from Statutory Federal and State Rates (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Federal taxes calculated at statutory rate	$ 6,270	$ 6,234	$ 11,570	$ 11,539
Increase (decrease) resulting from:
State taxes, net of federal benefit	1,543	741	2,686	1,351
Benefit of equity based compensation	(15)	20	(751)	(175)
Municipal interest income, net of interest disallowance	(207)	(376)	(408)	(742)
Bank owned life insurance	(13)	(21)	(25)	(42)
Stock offering costs	141		141
Other	75	(24)	63	68
Total	$ 7,794	$ 6,574	$ 13,276	$ 11,999
Federal taxes calculated at statutory rate, percentage	21.00%	35.00%	21.00%	35.00%
Increase (decrease) resulting from:
State taxes, net of federal benefit, percentage	5.20%	4.20%	4.90%	4.10%
Benefit of equity based compensation, percentage	(0.10%)	0.10%	(1.40%)	(0.50%)
Municipal interest income, net of interest disallowance	(0.70%)	(2.10%)	(0.70%)	(2.30%)
Bank owned life insurance, percentage	(0.00%)	(0.10%)	(0.00%)	(0.10%)
Stock offering costs, percentage	0.50%	0.00%	0.30%	0.00%
Other, percentage	0.20%	(0.20%)	0.00%	0.20%
Income tax expense, as reported, percentage	26.10%	36.90%	24.10%	36.40%

Income Taxes - Schedule of Net Deferred Tax liability (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Deferred tax assets:
Allowance for loan losses	$ 6,865	$ 6,264
Amortization of core deposit intangible	898	759
Deferred compensation	4,448	6,158
Unrealized loss on available-for-sale debt securities	4,563	988
Other	3,222	3,599
Subtotal	19,996	17,768
Deferred tax liabilities:
FHLB stock dividends	(550)	(550)
Depreciation	(4,322)	(4,115)
Cash flow hedges	(930)
Mortgage servicing rights	(28,518)	(19,830)
Other	(5,969)	(5,131)
Subtotal	(40,289)	(29,626)
Net deferred tax liability	$ (20,293)	$ (11,858)

Commitments and Contingencies - Summary of Financial Instruments with Off-Balance Sheet Credit Risk (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Financial instruments with off-balance sheet credit loss	$ 1,107,041	$ 1,000,158
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	1,088,486	977,276
Letter of Credit
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Financial instruments with off-balance sheet credit loss	$ 18,555	$ 22,882

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Total principal amount of loans repurchased or indemnified	$ 1,543	$ 921	$ 2,662	$ 1,770

Commitments and Contingencies - Summary of Allowance for Loan Repurchases or Indemnifications (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 3,514	$ 2,842	$ 3,386	$ 2,659
Provision for loan repurchases or indemnifications	206	201	392	384
Losses on loans repurchased or indemnified	(74)	(6)	(132)	(6)
Balance at end of period	$ 3,646	$ 3,037	$ 3,646	$ 3,037

Derivatives - Additional Information (Details) $ in Thousands	1 Months Ended	6 Months Ended
	Jul. 31, 2017 USD ($) InterestRateSwap	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($) InterestRateSwap
Derivative [Line Items]
Lock in period for interest rates		45 days
Long-term debt		$ 139,375	$ 143,302
Notional amount	$ 100,000
Interest rate swap maturity date		Jun. 30, 2024
Other Assets
Derivative [Line Items]
Derivative contracts collateral amount		$ 10,896	4,309
Designated as Hedging
Derivative [Line Items]
Notional amount		30,000	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
Other comprehensive income to be accreted		1,559
Interest Rate Swaps \| Designated as Hedging
Derivative [Line Items]
Fair value of interest rate swap			1,127
Gain on cancellation of swaps, tax-adjusted amount		1,564
Interest Rate Swaps \| Subordinated Debentures
Derivative [Line Items]
Notional amount				$ 30,000
Fair value of interest rate swap		$ 1,296	$ 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 Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jul. 31, 2017
Derivatives Fair Value [Line Items]
Notional amount			$ 100,000
Not Designated As Hedging
Derivatives Fair Value [Line Items]
Notional amount	$ 1,789,798	$ 1,810,484
Asset	13,821	8,258
Liability	5,480	1,699
Not Designated As Hedging \| Interest rate contracts
Derivatives Fair Value [Line Items]
Notional amount	231,899	146,754
Asset	3,798	1,146
Liability	3,798	1,146
Not Designated As Hedging \| Forward commitments
Derivatives Fair Value [Line Items]
Notional amount	717,330	870,574
Liability	1,682	553
Not Designated As Hedging \| Interest rate-lock commitments
Derivatives Fair Value [Line Items]
Notional amount	597,569	504,156
Asset	9,495	6,768
Not Designated As Hedging \| Futures Contracts
Derivatives Fair Value [Line Items]
Notional amount	231,000	283,000
Asset	445	315
Not Designated As Hedging \| Option Contracts
Derivatives Fair Value [Line Items]
Notional amount	12,000	6,000
Asset	83	29
Designated as Hedging
Derivatives Fair Value [Line Items]
Notional amount	30,000	130,000
Asset	1,296	1,432
Designated as Hedging \| Interest Rate Swaps
Derivatives Fair Value [Line Items]
Notional amount	30,000	130,000
Asset	$ 1,296	$ 1,432

Derivatives - Schedule of Gains (Losses) Included in the Consolidated Statements of Income Related to Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (1,456)	$ (5,361)	$ 4,869	$ (5,739)
Derivatives Not Designated As Hedging Instruments \| Included in Mortgage Banking Income \| Interest rate-lock commitments
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(684)	(1,433)	2,727	1,509
Derivatives Not Designated As Hedging Instruments \| Included in Mortgage Banking Income \| Forward commitments
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	635	$ (3,928)	5,953	$ (7,248)
Derivatives Not Designated As Hedging Instruments \| Included in Mortgage Banking Income \| Futures Contracts
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(1,369)		(3,816)
Derivatives Not Designated As Hedging Instruments \| Included in Mortgage Banking Income \| Option Contracts
Derivatives Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(38)		5
Designated as Hedging
Derivatives Fair Value [Line Items]
Amount of gain (loss) reclassified from other comprehensive income and recognized in interest expense on long-term debt	$ 25		$ (7)

Derivatives - Schedule of Other Comprehensive Income (Loss), Net of Tax, for Derivative Instruments Designated as Cash Flow Hedges (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Derivatives Fair Value [Line Items]
Amount of gain recognized in other comprehensive income, net of tax	$ 196	$ 1,469
Designated as Hedging
Derivatives Fair Value [Line Items]
Amount of gain recognized in other comprehensive income, net of tax	$ 196	$ 1,469

Fair Value Measurements - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financial assets:
Interest receivable	$ 12,729		$ 13,069
Mortgage servicing rights, net	109,449	$ 93,160	76,107	$ 47,593	$ 33,081
Carrying Amount
Financial assets:
Cash and cash equivalents	104,417		119,751
Investment securities	611,435		543,992
Federal Home Loan Bank Stock	12,641		11,412
Loans, net	3,389,228		3,142,870
Loans held for sale	374,916		526,185
Interest receivable	12,729		13,069
Mortgage servicing rights, net	109,449		76,107
Derivatives assets	15,117		9,690
Financial liabilities:
Deposits, Without stated maturities	3,179,754		2,976,066
Deposits, With stated maturities	730,109		688,329
Securities sold under agreement to repurchase	15,996		14,293
Short term borrowings	187,522		190,000
Interest payable	2,180		1,504
Long-term debt	139,375		143,302
Derivatives liabilities	5,480		1,699
Fair Value
Financial assets:
Cash and cash equivalents	104,417		119,751
Investment securities	611,435		543,992
Loans, net	3,384,932		3,141,400
Loans held for sale	374,916		526,185
Interest receivable	12,729		13,069
Mortgage servicing rights, net	109,449		76,107
Derivatives assets	15,117		9,690
Financial liabilities:
Deposits, Without stated maturities	3,179,754		2,976,066
Deposits, With stated maturities	731,029		682,403
Securities sold under agreement to repurchase	15,996		14,293
Short term borrowings	187,522		190,000
Interest payable	2,180		1,504
Long-term debt	138,578		149,135
Derivatives liabilities	5,480		1,699
Fair Value \| Fair Value Level 1
Financial assets:
Cash and cash equivalents	104,417		119,751
Financial liabilities:
Deposits, Without stated maturities	3,179,754		2,976,066
Securities sold under agreement to repurchase	15,996		14,293
Short term borrowings	187,522		190,000
Interest payable	631		575
Fair Value \| Fair Value Level 2
Financial assets:
Investment securities	611,435		540,388
Loans, net			3,064,373
Loans held for sale	374,916		526,185
Interest receivable	12,729		13,069
Derivatives assets	15,117		9,690
Financial liabilities:
Deposits, With stated maturities	731,029		682,403
Interest payable	1,549		929
Long-term debt	138,578		149,135
Derivatives liabilities	5,480		1,699
Fair Value \| Fair Value Level 3
Financial assets:
Investment securities			3,604
Loans, net	3,384,932		77,027
Mortgage servicing rights, net	$ 109,449		$ 76,107

Fair Value Measurements - Balances and Levels of Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financial assets:
Mortgage servicing rights, net	$ 109,449	$ 93,160	$ 76,107	$ 47,593	$ 33,081
Impaired loans	9,263		9,373
Available-for-sale securities, at fair value			543,992
Fair Value, Measurements, Recurring
Financial assets:
Investment securities	611,435
Loans held for sale	374,916		526,185
Mortgage servicing rights, net	109,449		76,107
Derivatives assets	15,117		9,690
Available-for-sale securities, at fair value			543,992
Financial liabilities:
Derivatives liabilities	5,480		1,699
Fair Value, Measurements, Recurring \| U.S. Government Agency Securities
Financial assets:
Investment securities	983
Available-for-sale securities, at fair value			986
Fair Value, Measurements, Recurring \| Mortgage-backed Securities
Financial assets:
Investment securities	477,974
Available-for-sale securities, at fair value			418,781
Fair Value, Measurements, Recurring \| Municipals, Tax Exempt
Financial assets:
Investment securities	122,247
Available-for-sale securities, at fair value			109,251
Fair Value, Measurements, Recurring \| Treasury Securities
Financial assets:
Investment securities	7,156
Available-for-sale securities, at fair value			7,252
Fair Value, Measurements, Recurring \| Equity Securities
Financial assets:
Investment securities	3,075
Available-for-sale securities, at fair value			7,722
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Financial assets:
Investment securities	611,435
Loans held for sale	374,916		526,185
Derivatives assets	15,117		9,690
Available-for-sale securities, at fair value			540,388
Financial liabilities:
Derivatives liabilities	5,480		1,699
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. Government Agency Securities
Financial assets:
Investment securities	983
Available-for-sale securities, at fair value			986
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Mortgage-backed Securities
Financial assets:
Investment securities	477,974
Available-for-sale securities, at fair value			418,781
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Municipals, Tax Exempt
Financial assets:
Investment securities	122,247
Available-for-sale securities, at fair value			109,251
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Treasury Securities
Financial assets:
Investment securities	7,156
Available-for-sale securities, at fair value			7,252
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2) \| Equity Securities
Financial assets:
Investment securities	3,075
Available-for-sale securities, at fair value			4,118
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Financial assets:
Mortgage servicing rights, net	109,449		76,107
Available-for-sale securities, at fair value			3,604
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3) \| Equity Securities
Financial assets:
Available-for-sale securities, at fair value			3,604
Fair Value, Measurements, Nonrecurring
Financial assets:
Other real estate owned	798		13,174
Impaired loans	431		77,027
Fair Value, Measurements, Nonrecurring \| Commercial and Industrial
Financial assets:
Impaired loans	107		1,971
Fair Value, Measurements, Nonrecurring \| Consumer and Other
Financial assets:
Impaired loans			25,320
Fair Value, Measurements, Nonrecurring \| Construction Loans \| Commercial and Industrial
Financial assets:
Impaired loans			4,211
Fair Value, Measurements, Nonrecurring \| 1-to-4 Family Mortgage \| Residential Real Estate
Financial assets:
Impaired loans	144		21,902
Fair Value, Measurements, Nonrecurring \| Owner Occupied \| Commercial Real Estate
Financial assets:
Impaired loans	180		10,030
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:
Other real estate owned	798		13,174
Impaired loans	431		77,027
Fair Value, Measurements, Nonrecurring \| Significant Unobservable Inputs (Level 3) \| Commercial and Industrial
Financial assets:
Impaired loans	107		1,971
Fair Value, Measurements, Nonrecurring \| Significant Unobservable Inputs (Level 3) \| Consumer and Other
Financial assets:
Impaired loans			25,320
Fair Value, Measurements, Nonrecurring \| Significant Unobservable Inputs (Level 3) \| Construction Loans \| Commercial and Industrial
Financial assets:
Impaired loans			4,211
Fair Value, Measurements, Nonrecurring \| Significant Unobservable Inputs (Level 3) \| 1-to-4 Family Mortgage \| Residential Real Estate
Financial assets:
Impaired loans	144		21,902
Fair Value, Measurements, Nonrecurring \| Significant Unobservable Inputs (Level 3) \| Owner Occupied \| Commercial Real Estate
Financial assets:
Impaired loans	$ 180		10,030
Fair Value, Measurements, Nonrecurring \| Significant Unobservable Inputs (Level 3) \| Non-Owner Occupied \| Commercial Real Estate
Financial assets:
Impaired loans			$ 13,593

Fair Value Measurements - Summary of Changes in Fair Value on Available-for-Sale Securities Measured at Fair Value on Recurring Basis using Significant Unobservable Inputs or Level 3 Inputs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Balance at beginning of period	$ 0	$ 4,549	$ 3,604	$ 4,549
Reclassification of equity securities without a readily determinable fair value to other assets	0	0	(3,604)	0
Balance at end of period	$ 0	$ 4,549	$ 0	$ 4,549

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Reclassification of other securities to other assets	$ 0	$ 0	$ 3,604	$ 0
Mortgage Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Net gains from fair value changes of mortgage loans	2,076	$ 1,864	4,197	$ 9,470
GNMA
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Mortgage loans previously sold			52,212
Mortgage loans held for sale measured at fair value	$ 0		0		$ 43,035
ASU 2016-01
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Reclassification of other securities to other assets			$ 3,604

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	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
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	$ 431	$ 77,027
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%	15.00%
Appraised value of property less costs to sell \| Other Real Estate Owned
Fair Value Inputs Assets Quantitative Information [Line Items]
Fair value of assets	$ 798	$ 13,174

Fair Value Measurements - Schedule of Differences between Fair Value and Principal Balance for Loans Held for Sale Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mortgage loans held for sale measured at fair value	$ 374,916	$ 482,089
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	364,063	467,039
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	$ 10,853	$ 15,050

Segment Reporting - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Segment	Jun. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment			2
Interest income	$ 54,529	$ 29,350	$ 105,222	$ 58,356
Mortgage Segment
Segment Reporting Information [Line Items]
Interest paid	$ 4,517	$ 3,831	$ 9,025	$ 7,382
Mortgage Segment \| Prime Interest Rate
Segment Reporting Information [Line Items]
Warehouse line of credit interest rate	5.00%	4.25%	5.00%	4.25%
Banking Segment
Segment Reporting Information [Line Items]
Interest income	$ 4,517	$ 3,831	$ 9,025	$ 7,382

Segment Reporting - Schedule of Segment Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net interest income	$ 51,517	$ 30,427	$ 99,946	$ 60,678
Provision for loan losses	1,063	(865)	1,380	(1,122)
Mortgage banking income	30,322	32,079	58,506	57,660
Net, change in fair value of mortgage servicing rights	(1,778)	(1,840)	(3,491)	(2,341)
Other noninterest income	7,164	5,418	13,968	11,425
Depreciation and amortization	1,132	991	2,238	1,993
Amortization of intangibles	802	123	1,655	515
Loss on sale of mortgage servicing rights		249		249
Other noninterest mortgage banking expense	25,089	24,791	48,968	47,159
Other noninterest expense	29,280	22,982	59,593	45,637
Income before income taxes	29,859	17,813	55,095	32,991
Income tax expense	7,794	6,574	13,276	11,999
Net income	22,065	11,239	41,819	20,992
Total assets	4,923,249	3,346,570	4,923,249	3,346,570	$ 4,727,713
Goodwill	137,190	46,867	137,190	46,867	$ 137,190
Banking Segment
Segment Reporting Information [Line Items]
Net interest income	51,669	29,999	100,440	59,855
Provision for loan losses	1,063	(865)	1,380	(1,122)
Mortgage banking income	6,894	7,118	13,002	12,784
Other noninterest income	7,164	5,418	13,968	11,425
Depreciation and amortization	990	861	1,968	1,725
Amortization of intangibles	802	123	1,655	515
Other noninterest mortgage banking expense	5,649	5,368	10,746	10,204
Other noninterest expense	29,280	22,982	59,593	45,637
Income before income taxes	27,943	14,066	52,068	27,105
Total assets	4,443,469	2,878,437	4,443,469	2,878,437
Goodwill	137,090	46,767	137,090	46,767
Mortgage Segment
Segment Reporting Information [Line Items]
Net interest income	(152)	428	(494)	823
Mortgage banking income	23,428	24,961	45,504	44,876
Net, change in fair value of mortgage servicing rights	(1,778)	(1,840)	(3,491)	(2,341)
Depreciation and amortization	142	130	270	268
Loss on sale of mortgage servicing rights		249		249
Other noninterest mortgage banking expense	19,440	19,423	38,222	36,955
Income before income taxes	1,916	3,747	3,027	5,886
Total assets	479,780	468,133	479,780	468,133
Goodwill	$ 100	$ 100	$ 100	$ 100

Segment Reporting - Schedule of Segment Financial Information (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Merger and conversion		$ 767	$ 1,193	$ 1,254
Clayton Banks
Segment Reporting Information [Line Items]
Merger and conversion	$ 0	$ 767	$ 1,193	$ 1,254

Minimum Capital Requirements - Additional Information (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Banking And Thrift [Abstract]
Capital conservative current buffer percentage	1.75%	1.25%
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. As of June 30, 2018 and December 31, 2017, the buffer was 1.75 percent and 1.25 percent, respectively. The capital conservative buffer will be fully phased in January 1, 2019 at 2.5 percent.

Minimum Capital Requirements - Schedule of Actual and Required Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
FB Financial Corporation
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital (to risk-weighted assets), Actual Amount	$ 524,655	$ 496,422
Total Capital (to risk-weighted assets), Actual Ratio	11.90%	12.00%
Total Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 352,709	$ 330,672
Total Capital (to risk-weighted assets), For capital adequacy purposes, Ratio	8.00%	8.00%
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount	$ 435,375	$ 382,340
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	9.90%	9.30%
Tier 1 Capital (to risk-weighted assets), Actual Amount	$ 498,308	$ 472,381
Tier 1 Capital (to risk-weighted assets), Actual Ratio	11.30%	11.40%
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 264,588	$ 247,969
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio	6.00%	6.00%
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount	$ 347,272	$ 299,629
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	7.90%	7.30%
Tier 1 Capital (to average assets), Actual Amount	$ 498,308	$ 472,381
Tier 1 Capital (to average assets), Actual Ratio	10.90%	10.50%
Tier 1 Capital (to average assets), For capital adequacy purposes, Amount	$ 182,865	$ 180,643
Tier 1 Capital (to average assets), For capital adequacy purposes, Ratio	4.00%	4.00%
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount	$ 468,308	$ 442,381
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio	10.60%	10.70%
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 198,810	$ 185,874
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio	4.50%	4.50%
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount	$ 281,648	$ 237,506
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	6.40%	5.80%
FirstBank
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Total Capital (to risk-weighted assets), Actual Amount	$ 497,123	$ 466,102
Total Capital (to risk-weighted assets), Actual Ratio	11.30%	11.30%
Total Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 351,945	$ 329,984
Total Capital (to risk-weighted assets), For capital adequacy purposes, Ratio	8.00%	8.00%
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount	$ 434,433	$ 381,544
Total Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	9.90%	9.30%
Total Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Amount	$ 439,932	$ 412,480
Total Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Ratio	10.00%	10.00%
Tier 1 Capital (to risk-weighted assets), Actual Amount	$ 470,776	$ 442,061
Tier 1 Capital (to risk-weighted assets), Actual Ratio	10.70%	10.70%
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 263,987	$ 247,422
Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio	6.00%	6.00%
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount	$ 346,482	$ 298,968
Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	7.90%	7.30%
Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions Amount	$ 263,987	$ 247,422
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	$ 470,776	$ 442,061
Tier 1 Capital (to average assets), Actual Ratio	10.20%	9.80%
Tier 1 Capital (to average assets), For capital adequacy purposes, Amount	$ 184,618	$ 180,987
Tier 1 Capital (to average assets), For capital adequacy purposes, Ratio	4.00%	4.00%
Tier 1 Capital (to average assets), To be well capitalized under prompt corrective action provisions, Amount	$ 230,773	$ 226,234
Tier 1 Capital (to average assets), To be well capitalized under prompt corrective action provisions, Ratio	5.00%	5.00%
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Amount	$ 470,776	$ 442,061
Common Equity Tier 1 Capital (to risk-weighted assets), Actual Ratio	10.70%	10.70%
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Amount	$ 197,990	$ 185,567
Common Equity Tier 1 Capital (to risk-weighted assets), For capital adequacy purposes, Ratio	4.50%	4.50%
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Amount	$ 280,486	$ 237,113
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum Capital adequacy with capital buffer, Ratio	6.40%	5.80%
Common Equity Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Amount	$ 285,985	$ 268,041
Common Equity Tier 1 Capital (to risk-weighted assets), To be well capitalized under prompt corrective action provisions, Ratio	6.50%	6.50%

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	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			$ 3,819	$ 3,154
Dividends declared	$ 70		70
Other Accrued Liabilities
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividends declared	$ 70		$ 70
EBI Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
EBI Units outstanding in equity based incentive plans for employees, units	29,172		29,172		67,470
EBI Units outstanding in equity based incentive plans for employees, value	$ 1,188		$ 1,188		$ 2,833
Expense related to cash settled EBI	$ 102	$ 184	$ 219	$ 482
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
EBI Units outstanding in equity based incentive plans for employees, units	1,135,828	1,226,901	1,135,828	1,226,901	1,214,325	1,200,848
Fair value of restricted stock units vested and released	$ 404	$ 3	$ 4,018	$ 1,346
Compensation cost related to stock grants and vesting of restricted stock units	1,861	$ 1,802	3,819	$ 3,154
Compensation cost due to modification of vesting terms of certain grants			249
Unrecognized compensation cost related to nonvested restricted stock units	$ 14,061		$ 14,061		$ 12,950
Expected weighted-average period to be recognized			2 years 9 months 10 days		2 years 9 months 18 days
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 offering period						95.00%
Maximum number of shares per participant						725
Maximum worth of award per participant						$ 25,000
Shares issued under plan	0	0	16,537	0
Number of shares reserved for issuance	2,444,428		2,444,428		2,460,965

Stock-Based Compensation - Summary of Vested and Unvested Restricted Stock Units Outstanding (Details) - Restricted Stock Units (RSUs) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted Stock Units Outstanding, Balance, beginning of period (unvested)	1,214,325	1,200,848
Restricted Stock Units Outstanding, Grants	110,466	97,893
Restricted Stock Units Outstanding, Released and distributed (vested)	(181,903)	(70,819)
Restricted Stock Units Outstanding, Forfeited/expired	(7,060)	(1,021)
Restricted Stock Units Outstanding, Balance, end of period (unvested)	1,135,828	1,226,901
Weighted Average Grant Date Fair Value, Balance, beginning of period (unvested)	$ 19.97	$ 19.00
Weighted Average Grant Date Fair Value, Grants	40.02	33.88
Weighted Average Grant Date Fair Value, Released and distributed (vested)	22.09	19.00
Weighted Average Grant Date Fair Value, Forfeited/expired	21.81	19.00
Weighted Average Grant Date Fair Value, Balance, end of period (unvested)	$ 21.59	$ 19.67

Related Party Transactions - Schedule of Loans Analysis to Executive Officers, Certain Management, Bank Directors and Their Affiliates (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Related Party Transactions [Abstract]
Loans outstanding, Beginning balance	$ 21,012
New loans and advances	1,611
Repayments	(4,657)
Loans outstanding, Ending balance	$ 17,966

Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Unfunded commitments	$ 4		$ 4		$ 2
Deposits from related parties	238,891		238,891		110,465
Aviation Time Sharing Agreement
Related Party Transaction [Line Items]
Payments to related party	53	$ 2	125	$ 27
Registration Rights Agreement \| 2016 IPO
Related Party Transaction [Line Items]
Payments to related party	700
Certain Executive Officers and Directors and Their Associates
Related Party Transaction [Line Items]
Unfunded commitments	10,189		10,189		4,672
Shareholders
Related Party Transaction [Line Items]
Unamortized leasehold improvements	126		126		137
Lease expense	111	$ 124	259	$ 250
Director \| Other Assets
Related Party Transaction [Line Items]
Amount of investment held by the company	$ 127		$ 127		$ 200