State Bank Financial (STBZ) 10-K 23 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Feb. 22, 2018	Jun. 30, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	STATE BANK FINANCIAL CORP
Entity Central Index Key	1,497,275
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 1,007.9
Entity Common Stock, Shares Outstanding		39,012,378
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and amounts due from depository institutions	$ 17,438	$ 13,219
Interest-bearing deposits in other financial institutions	211,142	132,851
Federal funds sold	2,297	3,523
Cash and cash equivalents	230,877	149,593
Investment securities available-for-sale	873,970	847,178
Investment securities held-to-maturity (fair value of $33,351 and $67,435 at 2017 and 2016, respectively)	32,852	67,063
Loans	3,532,193	2,814,572
Allowance for loan and lease losses	(28,750)	(26,598)
Loans, net	3,503,443	2,787,974
Loans held-for-sale (includes loans at fair value of $25,791 and $35,813 at 2017 and 2016, respectively)	36,211	52,169
Other real estate owned	895	10,897
Premises and equipment, net	51,794	52,056
Goodwill	84,564	77,084
Other intangibles, net	11,034	12,749
SBA servicing rights	4,069	3,477
Bank-owned life insurance	67,313	65,371
Other assets	61,560	99,248
Total assets	4,958,582	4,224,859
Liabilities:
Noninterest-bearing deposits	1,191,106	984,419
Interest-bearing deposits	3,052,029	2,446,746
Total deposits	4,243,135	3,431,165
Federal funds purchased and securities sold under agreements to repurchase	25,209	27,673
FHLB Borrowings	0	47,014
Notes payable	398	398
Other liabilities	48,289	104,976
Total liabilities	4,317,031	3,611,226
Shareholders' equity:
Preferred stock, $1 par value; 2,000,000 shares authorized, no shares issued and outstanding at 2017 and 2016, respectively	0	0
Common stock, $.01 par value; 100,000,000 shares authorized; 38,992,163 and 38,845,573 shares issued and outstanding at 2017 and 2016, respectively	390	388
Additional paid-in capital	413,583	409,736
Retained earnings	230,145	205,966
Accumulated other comprehensive loss, net of tax	(2,567)	(2,457)
Total shareholders' equity	641,551	613,633
Total liabilities and shareholders' equity	$ 4,958,582	$ 4,224,859

CONSOLIDATED STATEMENTS OF FIN3

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Investment securities held-to-maturity	$ 33,351	$ 67,435
Loans held for sale at fair value	$ 25,791	$ 35,813
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	38,992,163	38,845,573
Common stock, shares outstanding (in shares)	38,992,163	38,845,573

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest income:
Loans	$ 151,258	$ 103,024	$ 92,938
Loan accretion	34,096	43,310	49,830
Investment securities	22,258	18,629	15,214
Deposits with other financial institutions	766	294	609
Total interest income	208,378	165,257	158,591
Interest expense:
Deposits	15,059	9,331	7,673
FHLB borrowings	463	140	3
Notes payable	38	105	210
Federal funds purchased and repurchase agreements	32	43	36
Total interest expense	15,592	9,619	7,922
Net interest income	192,786	155,638	150,669
Provision for loan and lease losses	6,110	237	3,486
Net interest income after provision for loan and lease losses	186,676	155,401	147,183
Noninterest income:
Amortization of FDIC receivable for loss share agreements	0	0	(16,488)
Service charges on deposits	6,191	5,440	5,976
Mortgage banking income	11,341	12,319	11,250
SBA income	6,491	6,458	5,539
Payroll and insurance income	6,098	5,625	4,709
ATM income	3,382	3,008	2,981
Bank-owned life insurance income	1,942	1,930	1,926
(Loss) gain on sale of investment securities	(1,453)	489	354
Other	5,765	4,032	3,864
Total noninterest income	39,757	39,301	20,111
Noninterest expense:
Salaries and employee benefits	91,844	78,775	83,295
Occupancy and equipment	13,372	12,169	12,432
Data processing	10,204	8,514	9,190
Legal and professional fees	4,376	4,695	5,071
Merger-related expenses	5,330	3,961	1,730
Marketing	2,102	2,216	2,318
Federal deposit insurance premiums and other regulatory fees	1,700	1,744	2,100
Loan collection costs and OREO activity	(716)	(579)	(1,597)
Amortization of intangibles	2,815	2,102	1,804
Other	7,790	7,330	7,079
Total noninterest expense	138,817	120,927	123,422
Income before income taxes	87,616	73,775	43,872
Income tax expense	41,042	26,184	15,449
Net income	$ 46,574	$ 47,591	$ 28,423
Basic earnings per share (in dollars per share)	$ 1.20	$ 1.29	$ 0.79
Diluted earnings per share (in dollars per share)	1.19	1.28	0.77
Cash dividends declared per common share (in USD per share)	$ 0.56	$ 0.56	$ 0.32
Weighted Average Shares Outstanding:
Basic (in shares)	37,923,320	35,931,528	34,810,855
Diluted (in shares)	37,994,657	36,033,643	36,042,719

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 46,574	$ 47,591	$ 28,423
Other comprehensive income (loss), net of tax:
Net change in unrealized losses	(2,816)	(1,910)	(9,249)
Amortization of net unrealized losses on securities transferred to held-to-maturity	196	(3)	0
Amounts reclassified for losses realized and included in earnings	3,071	682	192
Other comprehensive income (loss), before income taxes	451	(1,231)	(9,057)
Income tax expense (benefit)	108	(408)	(3,503)
Other comprehensive income (loss), net of income taxes	343	(823)	(5,554)
Comprehensive income	$ 46,917	$ 46,768	$ 22,869

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Warrants	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance warrants (in shares) at Dec. 31, 2014		2,581,191
Balance (in shares) at Dec. 31, 2014			32,269,604
Balance at Dec. 31, 2014	$ 464,095		$ 323	$ 297,479	$ 162,373	$ 3,920
Increase (decrease) in shareholders' equity
Exercise of stock warrants (in shares)		(2,408,446)	1,401,188
Exercise of stock warrants	547		$ 14	533
Share-based compensation	3,595			3,595
Restricted stock activity (in shares)			552,086
Restricted stock activity	(27)		$ 6	50	(83)
Issuance of common stock (in shares)			2,854,970
Issuance of common stock	57,042		$ 28	57,014
Other comprehensive loss	(5,554)					(5,554)
Common stock dividends	(11,631)				(11,631)
Net income	$ 28,423				28,423
Balance warrants (in shares) at Dec. 31, 2015	172,745	172,745
Balance (in shares) at Dec. 31, 2015			37,077,848
Balance at Dec. 31, 2015	$ 536,490		$ 371	358,671	179,082	(1,634)
Increase (decrease) in shareholders' equity
Exercise of stock warrants (in shares)		(38,833)	30,180
Exercise of stock warrants	200		$ 0	200
Share-based compensation	3,889			3,889
Repurchase of common stock (in shares)			(270,715)
Repurchase of common stock	(5,128)		$ (3)	(5,125)
Restricted stock activity (in shares)			71,016
Restricted stock activity	60		$ 1	85	(26)
Issuance of common stock (in shares)			1,937,244
Issuance of common stock	52,035		$ 19	52,016
Other comprehensive loss	(823)					(823)
Common stock dividends	(20,681)				(20,681)
Net income	$ 47,591				47,591
Balance warrants (in shares) at Dec. 31, 2016	133,912	133,912
Balance (in shares) at Dec. 31, 2016	38,845,573		38,845,573
Balance at Dec. 31, 2016	$ 613,633		$ 388	409,736	205,966	(2,457)
Increase (decrease) in shareholders' equity
Exercise of stock warrants (in shares)		(51,008)	35,211
Exercise of stock warrants	1		$ 1	0
Share-based compensation	3,791			3,791
Restricted stock activity (in shares)			90,175
Restricted stock activity	(1,174)		$ 1	(694)	(481)
Stock option activity (in shares)			8,718
Stock option activity	(138)			415	(553)
Issuance of common stock (in shares)			12,486
Issuance of common stock	335		$ 0	335
Adoption of ASU 2018-02	0				453	(453)
Other comprehensive loss	343					343
Common stock dividends	(21,814)				(21,814)
Net income	$ 46,574				46,574
Balance warrants (in shares) at Dec. 31, 2017	82,904	82,904
Balance (in shares) at Dec. 31, 2017	38,992,163		38,992,163
Balance at Dec. 31, 2017	$ 641,551		$ 390	$ 413,583	$ 230,145	$ (2,567)

CONSOLIDATED STATEMENTS OF SHA7

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends paid per common share (in USD per share)	$ 0.56	$ 0.56	$ 0.32

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows from Operating Activities
Net income	$ 46,574	$ 47,591	$ 28,423
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation, amortization, and accretion	11,649	11,330	11,393
Provision for loan and lease losses	6,110	237	3,486
Accretion on acquisitions, net	(34,096)	(43,310)	(47,890)
Gains on sales of other real estate owned	(1,763)	(1,672)	(4,532)
Writedowns of other real estate owned	226	587	969
Net decrease in FDIC receivable for covered losses	0	0	6,250
Funds paid to FDIC	0	0	(1,784)
Loss share termination	0	0	16,959
Deferred income tax expense (benefit)	10,632	13,045	(24,828)
Proceeds from sales of mortgage loans held-for-sale	494,920	534,597	512,466
Proceeds from sales of SBA loans held-for-sale	55,541	59,081	46,512
Originations of mortgage loans held-for-sale	(472,912)	(509,355)	(508,117)
Originations of SBA loans held-for-sale	(44,353)	(63,882)	(48,254)
Mortgage banking activities	(11,341)	(12,319)	(11,250)
Gains on sales of SBA loans	(5,252)	(5,425)	(4,387)
Losses (gains) on sales of available-for-sale securities	1,453	(489)	(354)
Share-based compensation expense	3,791	3,889	3,595
Changes in fair value of SBA servicing rights	621	472	(40)
Changes in other assets and other liabilities, net	8,027	(14,657)	(7,402)
Net cash provided by (used in) operating activities	69,827	19,720	(28,785)
Cash flows from Investing Activities
Purchase of investment securities available-for-sale	(382,683)	(298,814)	(648,133)
Proceeds from sales and calls of investment securities available-for-sale	233,946	113,589	364,023
Proceeds from maturities and paydowns of investment securities available-for-sale	191,602	183,123	155,493
Proceeds from maturities and paydowns of investment securities held-to-maturity	39,373	0	0
Purchase of investment securities held-to-maturity	(5,000)	(10,500)	0
Loan originations, repayments and resolutions, net	29,573	(191,683)	(195,373)
Purchases of loans	0	(1,300)	0
Net purchases of premises and equipment	(2,260)	(1,747)	(720)
Proceeds from sales of other real estate owned	12,349	4,987	17,608
Net cash (paid) received in excess of assets and liabilities acquired in purchase business combinations	(137,714)	3,661	(14,958)
Net cash used in investing activities	(20,814)	(198,684)	(322,060)
Cash Flows from Financing Activities
Net increase in noninterest-bearing customer deposits	104,034	83,422	168,033
Net increase (decrease) in interest-bearing customer deposits	2,335	103,519	(115,408)
Proceeds from FHLB advances	980,000	655,000	60,000
Repayments of FHLB advances	(1,027,014)	(655,000)	(60,000)
Net (decrease) increase in federal funds purchased and securities sold under repurchase agreements	(2,464)	(6,457)	4,591
Payment of contingent consideration	(1,495)	(150)	0
Net decrease in notes payable	0	(1,414)	(959)
Repurchase of common stock	0	(5,128)	0
Issuance of common stock	1	200	547
Stock option activity	(138)	0	0
Restricted stock activity	(1,174)	(116)	(124)
Dividends paid to shareholders	(21,814)	(20,681)	(11,631)
Net cash provided by financing activities	32,271	153,195	45,049
Net increase (decrease) in cash and cash equivalents	81,284	(25,769)	(305,796)
Cash and cash equivalents, beginning	149,593	175,362	481,158
Cash and cash equivalents, ending	230,877	149,593	175,362
Cash Paid During the Period for:
Interest expense	14,154	7,576	7,158
Income taxes	18,960	21,815	36,170
Supplemental Disclosure of Noncash Investing and Financing Activities:
Goodwill and fair value acquisition adjustments	7,480	40,727	25,751
Unrealized losses (gains) on securities and cash flow hedges, net of tax	343	(823)	(5,554)
Transfer of investment securities available-for-sale to held-to-maturity	0	56,595	0
Transfers of loans to other real estate owned	1,500	3,260	9,825
Transfers of banking premises (from) to other real estate owned	(690)	0	560
Acquisitions:
Assets acquired	909,117	484,158	529,172
Liabilities assumed	713,663	434,398	462,050
Net assets	$ 195,454	$ 49,760	$ 67,122

Nature of Business and Summary

Nature of Business and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Nature of Business and Summary of Significant Accounting Policies	NOTE 1: NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES The consolidated financial statements of State Bank Financial Corporation and Subsidiary (the "Company") include the financial statements of State Bank Financial Corporation and its wholly-owned subsidiary, State Bank and Trust Company (the "Bank" or "State Bank"). All intercompany transactions and balances have been eliminated in consolidation. Certain reclassifications of prior year amounts have been made to conform with the current year presentations. These reclassifications had no impact on prior years' net income, as previously reported. State Bank and Trust Company was organized as a Georgia-state chartered bank, which opened October 4, 2005. The Bank is primarily regulated by the FDIC and undergoes periodic examinations by this regulatory authority. On July 24, 2009, State Bank and Trust Company closed on investment agreements under which new investors infused $292.1 million , gross (before expenses), of additional capital into the Bank, which resulted in a successor entity. This significant recapitalization resulted in a change of control and a new basis of accounting was applied. At the annual shareholders' meeting held March 11, 2010, approval was granted through proxy vote for the formation of a bank holding company. The required regulatory approval was obtained in July 2010 and the holding company reorganization was completed July 23, 2010. Between July 24, 2009 and December 31, 2017 , the Company successfully completed 17 bank acquisitions totaling $6.0 billion in assets and $5.2 billion in deposits. The acquisitions include the Company's acquisitions of NBG Bancorp, Inc. and S Bankshares, Inc., the holding companies for The National Bank of Georgia and S Bank, respectively, both of which closed on December 31, 2016. The acquisitions also include the Bank's acquisition of AloStar Bank of Commerce, which closed on September 30, 2017. The accounting and reporting policies of the Company conform to accounting principles generally accepted in the United States of America and to prevailing practices within the financial institutions industry. The following is a summary of the significant accounting policies that the Company follows in presenting its consolidated financial statements. Nature of Business State Bank Financial Corporation is a bank holding company whose primary business is conducted through 32 full-service branch offices of State Bank and Trust Company, its wholly-owned banking subsidiary. Through the Bank, the Company operates a full service banking business and offers a broad range of commercial and retail banking products to its customers throughout seven of Georgia's eight largest MSAs. The Company is subject to regulations of certain federal and state agencies and is periodically examined by those regulatory agencies. Basis of Presentation In preparing the consolidated 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 revenue and expenses for the period. Actual results could differ significantly from those estimates. Significant estimates include the allowance for loan and lease losses, the valuation of other real estate owned, the amount and timing of expected cash flows from purchased credit impaired loans, the fair value of investment securities and other financial instruments, and the valuation of goodwill. A substantial portion of the Company's loans are secured by real estate located in its market area. Accordingly, the ultimate collectability of a substantial portion of the Company's loan portfolio is susceptible to changes in the real estate market conditions. As defined by authoritative guidance, segment disclosures require reporting information about a company's operating segments using a “management approach.” Reportable segments are identified as those revenue-producing components for which separate financial information is produced internally and which are subject to evaluation by the chief operating decision maker in deciding how to allocate resources to segments. The Company operates as one reportable segment. Cash and Cash Equivalents Cash and cash equivalents, as presented in the consolidated financial statements, includes cash on hand, cash items in process of collection, federal funds sold, and interest-bearing deposits with other financial institutions with maturities less than 90 days. Investments Management determines the appropriate classifications of investment securities at the time of purchase and reevaluates such designation as needed. At December 31, 2017 and 2016 , the Company classified all of its investment securities as either available-for-sale or held-to-maturity. Investment securities available-for-sale are reported at fair value, as determined by independent quotations. Investment securities held-to-maturity represent those securities management has the positive intent and ability to hold to maturity and are reported at amortized cost. Purchase premiums and discounts on investment securities are amortized and accreted to interest income using the effective interest rate method over the remaining lives of the securities, taking into consideration assumed prepayment patterns. Realized gains and losses are derived using the specific identification method for determining the cost of securities sold and are recognized on the trade date. The Company reclassified certain of its investment securities available-for-sale to held-to-maturity during the year ended December 31, 2016. The difference between book value and fair value at the date of transfer will continue to be reported in a separate component of accumulated other comprehensive income (loss), and will be amortized into income over the remaining life of the securities as an adjustment of yield. The difference between fair value at the date of transfer and par value is being amortized back to par value over the remaining life of the security as an adjustment to yield. Management evaluates securities for other-than-temporary impairment ("OTTI") on at least a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. In connection with the assessment for other-than-temporary impairment of investment securities, management obtains fair value estimates by independent quotations, assesses current credit ratings and related trends, reviews relevant delinquency and default information, assesses expected cash flows and coverage ratios, assesses the relative strength of credit support from less senior tranches of the securities, reviews average credit score data of underlying mortgages, and assesses other current data. The severity and duration of impairment and the likelihood of potential recovery of impairment is considered along with the intent and ability to hold any impaired security to maturity or recovery of carrying value. Unrealized losses, other than those determined to be other-than-temporary, and unrealized gains on available-for-sale are excluded from net income and are reported, net of tax, in other comprehensive income and in accumulated other comprehensive income (loss), a separate component of shareholders' equity. A decline in the market value of any security below cost that is deemed other-than-temporary results in a charge to earnings and the establishment of a new cost basis for that security. At December 31, 2017 and 2016 , the Company did not have any securities with other than temporary impairment. Investment in stock of the Federal Home Loan Bank ("FHLB") is required of every federally insured financial institution which utilizes the FHLB's services. The investment in FHLB stock is included in "other assets" at its original cost basis, as cost approximates fair value since there is no readily determinable market value for such investments given the redemptive provision of the FHLB. The Company acquired Federal Reserve Bank ("FRB") stock in its acquisition of NBG Bancorp, Inc. The investment in FRB stock is included in "other assets" at its original cost basis, as cost approximates fair value since there is no readily determinable market value for such investments. Organic Loans Organic loans, defined as loans not purchased in the acquisition of an institution or credit impaired portfolio, are loans management has the intent and ability to hold for the foreseeable future, until maturity, or until payoff. Organic loans are reported at their principal amounts outstanding, net of unearned income, deferred loan fees and origination costs, and unamortized premiums or discounts on purchased participation loans. Interest income is recognized using the simple interest method on the daily balance of the principal amount outstanding. Unearned income, primarily arising from deferred loan fees net of certain origination costs, is recognized as an adjustment of the related loan yield. Past due status is based on the contractual terms of the loan agreement. Generally, the accrual of interest income is discontinued and loans are placed on nonaccrual status when reasonable doubt exists as to the full, timely collection of interest or principal or when they reach 90 days past due. Interest previously accrued but not collected is reversed against current period interest income when such loans are placed on nonaccrual status. Interest on nonaccrual loans when ultimately collected is recorded as a principal reduction. Nonaccrual loans are returned to accrual status when all principal and interest amounts contractually due are brought current. In addition, the future payments must be reasonably assured along with a period of at least six months of repayment performance by the borrower depending on the contractual payment terms. When it has been determined that a loan cannot be collected in whole or in part, then the uncollectible portion is charged-off. The Company considers an organic loan impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. Additionally, loans for which the terms have been modified and for which (i) the borrower is experiencing financial difficulties and (ii) a concession has been granted to the borrower by the Company are considered troubled debt restructurings ("TDRs") and are included in impaired loans. The Company's policy requires that impaired loans be individually evaluated for impairment if either 1) contractual balances are $500,000 and greater or 2) less than $500,000 and 180 day past due or greater. Loans are reviewed for impairment based on the present value of expected future cash flows, discounted at the loan's effective interest rate, or the loan's observable market price, or the fair value of the collateral less disposal costs, as applicable, if the loan is collateral dependent. The Company's policy requires that large pools of smaller balance homogeneous loans, such as consumer, residential and installment loans, be collectively evaluated for impairment by the Company. Impairment losses are included in the allowance for loan and lease losses through a provision charge to earnings. All loans considered impaired are placed on nonaccrual status in accordance with policy. The interest portion of cash receipts on impaired loans are recorded as income when received unless full recovery of principal is in doubt whereby cash received is recorded as a reduction to the Company's recorded investment in the loan. All organic impaired loans are reviewed at least quarterly. Reviews may be performed more frequently if material information is available before the next scheduled quarterly review. Existing valuations are reviewed to determine if additional discounts or new appraisals are required. The discounts may include the following: length of time to market and sell the property, as well as expected maintenance costs, insurance and taxes and real estate commissions on sale. Purchased Loans Purchased non-credit impaired loans ("PNCI loans") Loans acquired without evidence of deterioration in credit quality since origination, referred to as purchased non-credit impaired loans, are initially recorded at estimated fair value on the acquisition date. Premiums and discounts created when the loans are recorded at their estimated fair values at acquisition are amortized or accreted over the remaining term of the loan as an adjustment to the related loan's yield. The Company accounts for performing loans acquired in business combinations using the contractual cash flows method whereby premiums and discounts are recognized using the interest method. There is no allowance for loan and lease losses established at the acquisition date for purchased loans. Following the acquisition of these loans, the policies regarding nonaccrual and impaired loan status is consistent with that described above for organic loans. A provision for loan losses is recorded should there be deterioration in these loans subsequent to the acquisition. Purchased credit impaired loans ("PCI loans") Purchased credit impaired loans, defined as acquired loans, which at acquisition, management determined it was probable that the Company would be unable to collect all contractual principal and interest payments due, are recorded at fair value at the date of acquisition. The fair values of loans with evidence of credit deterioration are recorded net of a nonaccretable discount and, if appropriate, an accretable discount. The nonaccretable discount, which is excluded from the carrying amount of acquired loans, is the difference between the contractually required payments and the cash flows expected to be collected at acquisition. Any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable discount and is recognized in interest income over the remaining life of the loan when there is reasonable expectation about the amount and timing of such cash flows. The difference between actual prepayments and expected prepayments does not affect the nonaccretable discount. Subsequent decreases to the expected cash flows will result in a provision for loan losses. Subsequent increases in the amount of cash expected to be collected from the borrower results in the reversal of any previously-recorded provision for loan and lease losses and related allowance for loan and lease losses, and then as a prospective increase in the accretable discount on the purchased credit impaired loans. All loans acquired in failed bank transactions are considered to have evidence of credit deterioration, as limited due diligence is afforded which does not allow a sufficient detailed review to classify the acquired loans into credit deterioration and performing categories. At the time of acquisition, purchased credit impaired loans are either accounted for as specifically-reviewed or as part of a loan pool. Loan pools are created by grouping loans with similar risk characteristics, the intent being to create homogeneous pools. Loans are grouped into pools based on a combination of various factors including product type, cohort, risk classification and term. Loans remain in the assigned pool until the individual pools have resolved. Gains and losses on individual loans within pools are deferred and retained in the pools until the pool closes, which is either when all the loans are resolved or the pool’s aggregate recorded investment reaches zero. Allowance for Loan and Lease Losses ("ALLL") The ALLL represents the amount considered adequate by management to absorb losses inherent in the loan portfolio at the balance sheet date. The ALLL is adjusted through provisions for loan losses charged or credited to operations. The provisions are generated through loss analyses performed on organic loans, estimated additional losses arising on PNCI loans subsequent to acquisition and impairment recognized as a result of decreased expected cash flows on PCI loans due to further credit deterioration since the previous quarterly cash flow re-estimation. The ALLL consists of both specific and general components. Individual loans are charged off against the ALLL when management determines them to be uncollectible. Subsequent recoveries, if any, of loans previously charged-off are credited to the ALLL. All known and inherent losses that are both probable and reasonable to estimate are recorded. While management utilizes available information to recognize losses on loans, future additions to the allowance may be necessary based on changes in economic conditions. In addition, various regulatory agencies, as an integral part of their examination process, periodically review the allowance. Such agencies may require adjustments to the ALLL based on their judgment about information available at the time of their examination. The Company assesses the adequacy of the ALLL quarterly with respect to organic and purchased loans. The assessment begins with a standard evaluation and analysis of the loan portfolio. All loans are consistently graded and monitored for changes in credit risk and possible deterioration in the borrower’s ability to repay the contractual amounts due under the loan agreements. Allowance for loan and lease losses for organic loans: The ALLL for organic loans consists of two components: (1) a specific amount against identified credit exposures where it is probable the Company will be unable to collect all amounts due according to the contractual terms of the loan agreements; and (2) a general amount based upon historical losses that are then adjusted for qualitative factors representative of various economic indicators and risk characteristics of the loan portfolio. Management establishes the specific amount by examining impaired loans. The majority of the Company's impaired loans are collateral dependent; therefore, nearly all of the specific allowances are calculated based on the fair value of the collateral less disposal costs, if applicable. Management establishes the general amount by reviewing the remaining loan portfolio (excluding those impaired loans discussed above) and incorporating allocations based on historical losses. The calculation of the general amount is subjected to qualitative factors that are somewhat subjective. The qualitative testing attempts to correlate the historical loss rates with current economic factors and current risks in the portfolio. The qualitative factors consist of but are not limited to: (1) economic factors including changes in the local or national economy; (2) the depth of experience in lending staff, credit administration and internal loan review; (3) asset quality trends; and (4) seasoning and growth rate of the portfolio segments. After assessing the applicable factors, the remaining amount is evaluated based on management's experience and the level of the organic ALLL is compared with historical trends and peer information as a reasonableness test. Allowance for loan and lease losses for purchased loans: Purchased loans are initially recorded at their acquisition date fair values. The carryover of allowance for loan and lease losses is prohibited as any credit losses in the loans are included in the determination of the fair value of the loans at the acquisition date. Fair values for purchased loans are based on a discounted cash flow methodology that involves assumptions and judgments as to credit risk, default rates, loss severity, collateral values, discount rates, payment speeds, prepayment risk and liquidity risk. The Company maintains an ALLL on purchased loans based on credit deterioration subsequent to the acquisition date. For purchased credit impaired loans accounted for under ASC 310-30, management establishes an allowance for credit deterioration subsequent to the date of acquisition by quarterly re-estimating expected cash flows with any decline in expected cash flows recorded as impairment in the provision for loan losses. Impairment is measured as the excess of the recorded investment in a loan over the present value of expected future cash flows discounted at the pre-impairment accounting yield of the loan. For any increases in cash flows expected to be collected, the Company first reverses only previously recorded ALLL, then adjusts the amount of accretable yield recognized on a prospective basis over the loan’s remaining life. For purchased loans that are not deemed impaired at acquisition, also referred to as purchased non-credit impaired loans, credit discounts representing the principal losses expected over the life of the loan are a component of the initial fair value and the discount is accreted to interest income over the life of the asset. Subsequent to the purchase date, the method used to evaluate the sufficiency of the credit discount is similar to originated loans, and if necessary, additional reserves are recognized in the allowance for loan and lease losses. Loans Held-for-Sale Loans held-for-sale include the majority of originated residential mortgage loans and certain Small Business Administration ("SBA") loans, which the Company has the intent and ability to sell. Mortgage Loans Held-for-Sale The Company has elected to record mortgage loans held-for-sale at fair value under the fair value option. The fair value of committed residential mortgage loans held-for-sale is determined by outstanding commitments from investors and the fair value of uncommitted loans is based on current delivery prices in the secondary mortgage market. Net origination fees and costs are recognized in earnings at the time of origination for residential mortgage loans held-for-sale. Gains and losses on mortgage loan sales are recognized based on the difference between the net sales proceeds, including the estimated value associated with servicing assets or liabilities, and the net carrying value of the loans sold. Adjustments to reflect unrealized gains and losses resulting from changes in fair value of residential mortgage loans held-for-sale, as well as realized gains and losses at the sale of the residential mortgage loans, are classified on the consolidated statements of income as noninterest income - mortgage banking income. The loan sales agreements generally require that we repurchase or indemnify the investors for losses or costs on loans we sell under certain limited conditions. Some of these conditions include underwriting errors or omissions, fraud or material misstatements by the borrower in the loan application or invalid market value on the collateral property due to deficiencies in the appraisal. In addition to these conditions, our loan sale contracts define a condition in which the borrower defaults during a short period of time, typically 120 days to one year, as an Early Payment Default ("EPD"). In the event of an EPD, we are required to return the premium paid by the investor for the loan as well as certain administrative fees, and in certain situations repurchase the loan or indemnify the investor. Any losses related to loans previously sold are charged against our recourse liability for mortgage loans previously sold. The recourse liability is based on historical loss experience adjusted for current information and events when it is probable that a loss will be incurred. SBA Loans Held-for-Sale SBA loans held-for-sale are recorded at the lower of cost or market. Any loans subsequently transferred to the held for investment portfolio are transferred at the lower of cost or market at that time. For SBA loans, fair value is determined on an individual loan basis primarily based on loan performance and available market information. Origination fees and costs for SBA loans held-for-sale are capitalized as part of the basis of the loan and are included in the calculation of realized gains and losses upon sale. Gains and losses are classified on the consolidated statements of income as noninterest income - SBA income. All SBA loan sales are executed on a servicing retained basis - refer to SBA Servicing Rights below for more information . Other Real Estate Owned ("OREO") Other real estate owned consists of real property (a) acquired through mergers and acquisitions, (b) acquired through foreclosure in satisfaction of loans receivable, and (c) banking premises formerly, but no longer, used for a specific business purpose. Other real estate is distinguished between organic, purchased non-credit impaired, or purchased credit impaired, consistent with the categories, respectively, at time of transfer. Real property acquired through mergers and acquisitions are recorded at fair value on Day 1 of the acquisition. Real estate acquired through foreclosure of loans, consisting of properties obtained through foreclosure proceedings or acceptance of a deed in lieu of foreclosure, is reported on an individual asset basis at the lower of cost or fair value, less costs to sell with any excess in loan balance charged against the allowance for loan and lease losses. Banking premises no longer used for a specific business purposes is transferred into OREO at the lower of its carrying value or fair value, less estimated costs to sell with any excess in carrying value charged to noninterest expense. For all fair value estimates of the real estate properties, fair value is determined on the basis of current appraisals, comparable sales, current market conditions, and other estimates of value obtained principally from independent sources. Management periodically reviews the carrying value of OREO for subsequent declines in fair value and adjusts the values as appropriate through noninterest expense. Gains or losses recognized on the disposition of the properties are recorded on the consolidated statements of income as "loan collection costs and OREO activity". Costs of improvements to real estate are capitalized, while costs associated with holding the real estate are charged to income. Prior to termination of the Company's loss share agreements with the FDIC in May 2015, OREO formerly covered under the agreements were reported exclusive of expected reimbursement cash flows from the FDIC. Subsequent adjustments to the estimated recoverable value of the other real estate resulted in a reduction of other real estate and a charge to other expense. The FDIC receivable was increased for the estimated amount to be reimbursed, with a corresponding offsetting amount recorded to other expense. Costs associated with holding the formerly covered other real estate were charged to noninterest expense, net of any expected reimbursements from the FDIC relating to previously covered external expenses. Premises and Equipment Premises and equipment are stated at cost, less accumulated depreciation, which is computed using the straight-line method over the estimated useful lives of the assets. The estimated useful lives of the assets range from 10 to 39 years for buildings and improvements and 3 to 15 years for furniture, fixtures, and equipment. Costs of improvements are capitalized and depreciated, while operating expenses are charged to current earnings. Goodwill and Other Intangibles, Net Goodwill represents the excess of the purchase price over the fair value of the net identifiable assets acquired in a business combination. Goodwill and other intangibles deemed to have an indefinite life are not amortized but instead are subject to review for impairment annually, or more frequently if deemed necessary. Also in connection with business combinations, the Company records core deposit intangibles, representing the value of the acquired core deposit base, and other identifiable intangible assets. Core deposit intangibles and other identifiable intangible assets are amortized on a straight-line basis over their estimated useful lives ranging up to 10 years. SBA Servicing Rights All sales of SBA loans, consisting of the guaranteed portion, are executed on a servicing retained basis. The standard sale structure under the SBA Secondary Participation Guaranty Agreement provides for the Company to retain a portion of the cash flow from the interest payment received on the loan. This cash flow is commonly known as a servicing spread. For any guaranteed loans sold at a premium, SBA regulations require the lender to keep a minimum 100 basis points in servicing spread which includes a minimum service fee of 40 basis points and a minimum premium protection fee of 60 basis points. The servicing spread is recognized as a servicing asset to the extent the spread exceeds adequate compensation for the servicing function. The fair value of the servicing asset is measured on a recurring basis at the present value of future cash flows using market-based discount assumptions. The future cash flows for each asset are based on their unique characteristics and market-based assumptions for prepayment speeds, default and voluntary prepayments. For non-guaranteed portions of servicing assets, future cash flows are estimated using loan specific assumptions for losses and recoveries. Adjustments to fair value are recorded as a component of "SBA income" on the consolidated statements of income. Servicing fee income is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income when earned. Derivative Instruments and Hedging Activities Interest Rate Swaps and Caps The Company enters into derivative financial instruments to manage interest rate risk, facilitate asset/liability management strategies and manage other exposures. These instruments may include interest rate swaps and interest rate caps and floors. All derivative financial instruments are recognized on the consolidated statements of financial condition as other assets or other liabilities, as applicable, at estimated fair value. The Company enters into master netting agreements with counterparties and/or requires collateral to cover exposures. In most cases, counterparties post at a zero threshold regardless of rating. Interest rate swaps are agreements to exchange interest payments based upon notional amounts. Interest rate swaps subject the Company to market risk associated with changes in interest rates, as well as the credit risk that the counterparty will fail to perform. Option contracts involve rights to buy or sell financial instruments on a specified date or over a period at a specified price. These rights do not have to be exercised. Some option contracts such as interest rate caps, involve the exchange of cash based on changes in specified indices. Interest rate caps are contracts to hedge interest rate increases based on a notional amount. Interest rate caps subject the Company to market risk associated with changes in interest rates, as well as the credit risk that the counterparty will fail to perform. Derivative financial instruments are designated, based on the exposure being hedged, as either fair value or cash flow hedges. Fair value hedge relationships mitigate exposure to the change in fair value of an asset, liability or firm commitment. Under the fair value hedging model, gains or losses attributable to the change in fair value of the derivative instrument, as well as the gains and losses attributable to the change in fair value of the hedged item, are recognized in other noninterest income in the period in which the change in fair value occurs. Hedge ineffectiveness is recognized as other noninterest income to the extent the changes in fair value of the derivative do not offset the changes in fair value of the hedged item. The corresponding adjustment to the hedged asset or liability is included in the basis of the hedged item, while the corresponding change in the fair value of the derivative instrument is recorded as an adjustment to other assets or other liabilities, as applicable. Cash flow hedge relationships mitigate exposure to the variability of future cash flows or other forecasted transactions. For cash flow hedge relationships, the effective portion of the gain or loss related to the derivative instrument is recognized as a component of accumulated other comprehensive income (loss). The ineffective portion of the gain or loss related to the derivative instrument, if any, is recognized in earnings as other noninterest income during the period of change. Amounts recorded in accumulated other comprehensive income (loss) are recognized in earnings in the period or periods during which the hedged item impacts earnings. The Company formally documents all hedging relati

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Acquisitions	NOTE 2: ACQUISITIONS Acquisition of AloStar Bank of Commerce On September 30, 2017, State Bank completed its acquisition of AloStar Bank of Commerce ("AloStar"). State Bank Interim Corp., a wholly-owned subsidiary of State Bank, merged with and into AloStar, immediately followed by the merger of AloStar with and into State Bank. Under the terms of the merger agreement, each share of AloStar common stock was converted into the right to receive $24.26 in cash. Total consideration paid was approximately $195.0 million . The merger of AloStar was accounted for under the acquisition method of accounting. Assets acquired, liabilities assumed and consideration exchanged were recorded at their respective acquisition date fair values. Fair values are preliminary and subject to refinement for up to one year after the closing date of the acquisition as additional information regarding the closing date fair values becomes available. Goodwill of $7.1 million was generated from the acquisition, none of which is expected to be deductible for income tax purposes. The following table summarizes the assets acquired and liabilities assumed and the consideration payable by the Company at the acquisition date (dollars in thousands) : As Recorded by AloStar Bank of Commerce Fair Value Adjustments As Recorded by the Company Assets Cash and cash equivalents $ 91,571 $ — $ 91,571 Investment securities available-for-sale 76,436 (195 ) (a) 76,241 Loans, net 728,319 (9,763 ) (b) 718,556 Core deposit intangible — 856 (c) 856 Premises and equipment, net 507 — 507 Other assets 11,430 2,233 (d) 13,663 Total assets acquired $ 908,263 $ (6,869 ) $ 901,394 Liabilities Deposits: Noninterest-bearing $ 102,653 $ — $ 102,653 Interest-bearing 603,069 (121 ) (e) 602,948 Total deposits 705,722 (121 ) 705,601 Other liabilities 7,912 — 7,912 Total liabilities assumed 713,634 (121 ) 713,513 Net identifiable assets acquired over liabilities assumed $ 194,629 $ (6,748 ) $ 187,881 Goodwill $ — $ 7,088 $ 7,088 Net assets acquired over liabilities assumed $ 194,629 $ 340 $ 194,969 Consideration: Cash consideration 194,969 Fair value of total consideration transferred $ 194,969 Explanation of fair value adjustments (a) Adjustment reflects the loss on certain securities that were sold immediately following the closing that was deemed to be a more accurate representation of fair value. (b) Adjustment reflects the fair value adjustment based on the State Bank's evaluation of the acquired loan portfolio and includes the adjustment to eliminate the recorded allowance for loan and lease losses. (c) Adjustment reflects the fair value adjustment to record the estimated core deposit intangible. (d) Adjustment reflects the fair value adjustment based on State Bank's evaluation of acquired other assets. (e) Adjustment reflects the fair value adjustment based on State Bank's evaluation of acquired deposits. The following table presents certain pro forma information as if AloStar had been acquired on January 1, 2015 (dollars in thousands, except per share amounts) . These results combine the historical results of AloStar in the Company's consolidated statements of income and, while certain adjustments were made for the estimated impact of certain fair value adjustments and other acquisition-related activity, they are not indicative of what would have occurred had the acquisition taken place on January 1, 2015. Merger-related costs are not included in the pro forma statements below. Twelve Months Ended December 31 2017 2016 2015 Pro Forma Pro Forma Pro Forma Net interest income $ 227,257 $ 192,035 $ 190,497 Net income 58,259 57,029 38,003 Earnings per share: Basic $ 1.50 $ 1.54 $ 1.06 Diluted 1.49 1.54 1.03 The following is a summary of the purchased credit impaired loans acquired in the AloStar transaction on September 30, 2017 (dollars in thousands) : Purchased Credit Impaired Loans Contractually required principal and interest at acquisition $ 108,308 Contractual cash flows not expected to be collected (nonaccretable difference) (19,093 ) Expected cash flows at acquisition 89,215 Accretable difference (11,664 ) Basis in acquired loans at acquisition - estimated fair value $ 77,551 On September 30, 2017, the fair value of the purchased non-credit impaired loans acquired in the AloStar transaction was $641.0 million . The gross contractual amounts receivable of the purchased non-credit impaired loans at acquisition was $707.0 million , of which $9.3 million was the amount of contractual cash flows not expected to be collected. Acquisition of NBG Bancorp, Inc. and The National Bank of Georgia On December 31, 2016 the Company completed its acquisition of NBG Bancorp, Inc. ("NBG Bancorp"), the holding company for The National Bank of Georgia ("National Bank of Georgia"), a national banking association. NBG Bancorp was immediately merged into the Company followed by the merger of National Bank of Georgia with and into State Bank. Under the terms of the merger agreement, each share of NBG Bancorp, Inc. common stock was converted into the right to receive either $45.45 in cash or 2.1642 shares of the Company's common stock. Elections by NBG Bancorp shareholders were prorated such that 50% of NBG Bancorp's shares were exchanged for cash and 50% were exchanged for Company common stock. The elections by NBG Bancorp's shareholders were made subsequent to merger completion and the final merger consideration was distributed in February 2017. Total consideration paid was approximately $77.9 million , consisting of $34.2 million in cash and $43.7 million in the Company's common stock. The merger of NBG Bancorp, Inc. was accounted for under the acquisition method of accounting, using pushdown accounting. Assets acquired, liabilities assumed and consideration exchanged were recorded at their respective acquisition date fair values. Fair values are preliminary and subject to refinement for up to one year after the closing date of the acquisition as additional information regarding the closing date fair values becomes available. Goodwill of $36.6 million was generated from the acquisition, none of which is expected to be deductible for income tax purposes. The following table summarizes the assets acquired and liabilities assumed and the consideration paid by the Company at the acquisition date (dollars in thousands) : As Recorded by NBG Bancorp, Inc. Fair Value Adjustments As Recorded by the Company Assets Cash and cash equivalents $ 38,146 $ (31,158 ) (a) $ 6,988 Investment securities available-for-sale 5,974 (40 ) (b) 5,934 Loans, net 348,641 (3,645 ) (c) 344,996 Loans held-for-sale 694 — 694 Other real estate owned 69 (5 ) (d) 64 Core deposit intangible — 3,740 (e) 3,740 Premises and equipment, net 7,943 (635 ) (f) 7,308 Bank-owned life insurance 1,499 — 1,499 Other assets 6,542 276 (g) 6,818 Total assets acquired $ 409,508 $ (31,467 ) $ 378,041 Liabilities Deposits: Noninterest-bearing $ 58,161 $ — $ 58,161 Interest-bearing 261,034 (30,711 ) (h) 230,323 Total deposits 319,195 (30,711 ) 288,484 FHLB advances 46,354 (140 ) (i) 46,214 Other liabilities 2,067 — 2,067 Total liabilities assumed 367,616 (30,851 ) 336,765 Net identifiable assets acquired over liabilities assumed $ 41,892 $ (616 ) $ 41,276 Goodwill $ — $ 36,587 $ 36,587 Net assets acquired over liabilities assumed $ 41,892 $ 35,971 $ 77,863 Consideration: State Bank Financial Corporation common shares issued 1,626,648 Purchase price per share of the Company's common stock $ 26.86 Company common stock issued 43,692 Cash exchanged for shares 34,171 Fair value of total consideration transferred $ 77,863 Explanation of fair value adjustments (a) Adjustment reflects the elimination of a deposit account The National Bank of Georgia held with State Bank. (b) Adjustment reflects the loss on certain securities that were sold immediately following close that was deemed to be a more accurate representation of fair value. (c) Adjustment reflects the fair value adjustment based on State Bank's evaluation of the acquired loan portfolio and includes the adjustment to eliminate the recorded allowance for loan and lease losses. (d) Adjustment reflects the fair value adjustment based on State Bank's evaluation of the acquired other real estate owned portfolio. (e) Adjustment reflects the fair value adjustment to record the estimated core deposit intangible. (f) Adjustment reflects the fair value adjustment based on appraised values. (g) Adjustment reflects the fair value adjustment based on State Bank's evaluation of acquired other assets. (h) Adjustment reflects the elimination of a deposit account The National Bank of Georgia held with State Bank and the fair value adjustment based on State Bank's evaluation of acquired deposits. (i) Adjustment arises since the rates on acquired FHLB advances were lower than the rates available on similar borrowings. Subsequent to the NBG Bancorp acquisition all FHLB advances were paid off. The following table discloses the impact of the merger with NBG Bancorp, Inc. (excluding the impact of merger-related expenses) from the acquisition date of December 31, 2016 (dollars in thousands, except per share amounts) . The table also presents certain pro forma information as if NBG Bancorp, Inc. had been acquired on January 1, 2015 . These results combine the historical results of NBG Bancorp, Inc. in the Company's consolidated statements of income and, while certain adjustments were made for the estimated impact of certain fair value adjustments and other acquisition-related activity, they are not indicative of what would have occurred had the acquisition taken place on January 1, 2015 . Merger-related costs are not included in the pro forma statements below. Twelve Months Ended December 31 2017 2016 2015 Pro Forma Pro Forma Pro Forma Net interest income $ 192,786 $ 173,583 $ 170,520 Net income 47,412 49,639 33,152 Earnings per share: Basic $ 1.22 $ 1.29 $ .88 Diluted 1.22 1.28 .86 The following is a summary of the purchased credit impaired loans acquired in the NBG Bancorp, Inc. transaction on December 31, 2016 (dollars in thousands) : Purchased Credit Impaired Loans Contractually required principal and interest at acquisition $ 33,584 Contractual cash flows not expected to be collected (nonaccretable difference) (3,736 ) Expected cash flows at acquisition 29,848 Accretable difference (2,799 ) Basis in acquired loans at acquisition - estimated fair value $ 27,049 On December 31, 2016, the fair value of the purchased non-credit impaired loans acquired in the NBG Bancorp, Inc. transaction was $317.9 million . The contractual balance of the purchased non-credit impaired loans at acquisition was $350.0 million , of which $4.4 million was the amount of contractual cash flows not expected to be collected. Acquisition of S Bankshares, Inc. and S Bank On December 31, 2016 the Company completed its acquisition of S Bankshares Inc. ("S Bankshares"), the holding company for S Bank, a Georgia state-chartered bank. S Bankshares was immediately merged into the Company followed by the merger of S Bank with and into State Bank. Under the terms of the merger agreement, each share of S Bankshares, Inc. common stock was converted into the right to receive either $56.70 in cash or 2.7444 shares of the Company's common stock. Elections by S Bankshares shareholders were prorated such that 60% of S Bankshares' shares were exchanged for Company common stock and 40% were exchanged for cash. Total consideration paid was approximately $12.6 million , consisting of $4.3 million in cash and $8.3 million in the Company's common stock. The acquisition of S Bankshares Inc. was accounted for under the acquisition method of accounting, using pushdown accounting. Assets acquired, liabilities assumed and consideration exchanged were recorded at their respective acquisition date fair values. Fair values are preliminary and subject to refinement for up to one year after the closing date of the acquisition as additional information regarding the closing date fair values becomes available. Goodwill of $4.1 million was generated from the acquisition, none of which is expected to be deductible for income tax purposes. The following table summarizes the assets acquired and liabilities assumed and the consideration paid by the Company at the acquisition date (dollars in thousands) : As Recorded by S Bankshares Inc. Fair Value Adjustments As Recorded by the Company Assets Cash and cash equivalents $ 954 $ — $ 954 Investment securities available-for-sale 13,814 (88 ) (a) 13,726 Loans, net 81,383 (2,344 ) (b) 79,039 Other real estate owned 1,278 (332 ) (c) 946 Core deposit intangible — 1,010 (d) 1,010 Premises and equipment, net 3,132 420 (e) 3,552 Bank-owned life insurance 3,124 — 3,124 Other assets 2,636 1,130 (f) 3,766 Total assets acquired $ 106,321 $ (204 ) $ 106,117 Liabilities Deposits: Noninterest-bearing $ 16,620 $ — $ 16,620 Interest-bearing 76,664 494 (g) 77,158 Total deposits 93,284 494 93,778 Federal funds purchased and securities sold under repurchase agreements 1,951 — 1,951 FHLB advances 800 — 800 Other liabilities 1,104 — 1,104 Total liabilities assumed 97,139 494 97,633 Net identifiable assets acquired over liabilities assumed $ 9,182 $ (698 ) $ 8,484 Goodwill $ — $ 4,140 $ 4,140 Net assets acquired over liabilities assumed $ 9,182 $ 3,442 $ 12,624 Consideration: State Bank Financial Corporation common shares issued 310,596 Purchase price per share of the Company's common stock $ 26.86 Company common stock issued 8,343 Cash exchanged for shares 4,281 Fair value of total consideration transferred $ 12,624 Explanation of fair value adjustments (a) Adjustment reflects the loss on certain securities that were sold immediately following close that was deemed to be a more accurate representation of fair value. (b) Adjustment reflects the fair value adjustment based on State Bank's evaluation of the acquired loan portfolio and includes the adjustment to eliminate the recorded allowance for loan and lease losses. (c) Adjustment reflects the fair value adjustment based on State Bank's evaluation of the acquired other real estate owned portfolio. (d) Adjustment reflects the fair value adjustment to record the estimated core deposit intangible. (e) Adjustment reflects the fair value adjustment based on appraised values. (f) Adjustment reflects the fair value adjustment based on State Bank's evaluation of acquired other assets. (g) Adjustment reflects the fair value adjustment based on State Bank's evaluation of acquired deposits. The following table discloses the impact of the merger with S Bankshares Inc. (excluding the impact of merger-related expenses) from the acquisition date of December 31, 2016 (dollars in thousands, except per share amounts) . The table also presents certain pro forma information as if S Bankshares Inc. had been acquired on January 1, 2015 . These results combine the historical results of S Bankshares Inc. in the Company's consolidated statements of income and, while certain adjustments were made for the estimated impact of certain fair value adjustments and other acquisition-related activity, they are not indicative of what would have occurred had the acquisition taken place on January 1, 2015 . Merger-related costs are not included in the pro forma statements below. Twelve Months Ended December 31 2017 2016 2015 Pro Forma Pro Forma Pro Forma Net interest income $ 192,786 $ 161,450 $ 156,427 Net income 47,031 49,325 29,179 Earnings per share: Basic $ 1.21 $ 1.32 $ .81 Diluted 1.21 1.32 .78 The following is a summary of the purchased credit impaired loans acquired in the S Bankshares Inc. transaction on December 31, 2016 (dollars in thousands) : Purchased Credit Impaired Loans Contractually required principal and interest at acquisition $ 15,966 Contractual cash flows not expected to be collected (nonaccretable difference) (2,805 ) Expected cash flows at acquisition 13,161 Accretable difference (1,377 ) Basis in acquired loans at acquisition - estimated fair value $ 11,784 On December 31, 2016, the fair value of the purchased non-credit impaired loans acquired in the S Bankshares Inc. transaction was $67.3 million . The contractual balance of the purchased non-credit impaired loans at acquisition was $77.0 million , of which $1.3 million was the amount of contractual cash flows not expected to be collected. Acquisition of Patriot Capital Corporation's Equipment Finance Group On October 22, 2015, State Bank announced the purchase of the equipment financing origination platform of Patriot Capital Corporation. The acquisition was not material to the financial results of State Bank. Goodwill of $5.3 million and other intangibles of $2.1 million were recorded in the acquisition. None of the goodwill is expected to be deductible for income tax purposes. Acquisition of Boyett Agency, LLC On February 26, 2015, State Bank entered into an Asset Purchase Agreement with Boyett Agency, LLC an independent insurance agency, pursuant to which State Bank acquired substantially all of the assets of Boyett Agency, LLC. The acquisition was not material to the financial results of State Bank. Goodwill of $539,000 and other intangibles of $319,000 were recorded in the acquisition. None of the goodwill is expected to be deductible for income tax purposes. Acquisition of Georgia-Carolina Bancshares Inc. and First Bank of Georgia On January 1, 2015, the Company completed its merger with Georgia-Carolina Bancshares, Inc., the holding company for First Bank. In the merger, First Bank, a Georgia-state-chartered bank, became a wholly-owned subsidiary bank of the Company. Under the terms of the merger agreement, each share of Georgia-Carolina Bancshares, Inc. common stock was converted into the right to receive $8.85 in cash and .794 shares of the Company's common stock. Total consideration paid was approximately $88.9 million , consisting of $31.8 million in cash and $57.0 million in the Company's common stock. On July 24, 2015, First Bank merged with and into State Bank. The merger of Georgia-Carolina Bancshares was accounted for under the acquisition method of accounting, using pushdown accounting. Assets acquired, liabilities assumed and consideration exchanged were recorded at their respective acquisition date fair values. Goodwill of $19.9 million was generated from the acquisition, none of which is expected to be deductible for income tax purposes. The following table summarizes the assets acquired and liabilities assumed and the consideration paid by the Company at the acquisition date (dollars in thousands) : As Recorded by Georgia-Carolina Bancshares, Inc. Fair Value Adjustments As Recorded by the Company Assets Cash and due from banks $ 20,873 $ — $ 20,873 Investment securities 130,218 999 (a) 131,217 Loans, net 293,814 590 (b) 294,404 Loans held-for-sale 34,956 — 34,956 Other real estate owned 4,428 2,042 (c) 6,470 Core deposit intangible — 6,710 (d) 6,710 Premises and equipment, net 9,175 2,803 (e) 11,978 Bank-owned life insurance 15,414 — 15,414 Other assets 9,122 (4,457 ) (f) 4,665 Total assets acquired $ 518,000 $ 8,687 $ 526,687 Liabilities Deposits: Noninterest-bearing $ 80,888 $ — $ 80,888 Interest-bearing 335,889 878 (g) 336,767 Total deposits 416,777 878 417,655 Securities sold under repurchase agreements 27,588 — 27,588 Other liabilities 11,823 652 (h) 12,475 Total liabilities assumed 456,188 1,530 457,718 Net identifiable assets acquired over liabilities assumed $ 61,812 $ 7,157 $ 68,969 Goodwill $ — $ 19,904 $ 19,904 Net assets acquired over liabilities assumed $ 61,812 $ 27,061 $ 88,873 Consideration: State Bank Financial Corporation common shares issued 2,854,970 Purchase price per share of the Company's common stock $ 19.98 Company common stock issued 57,042 Cash exchanged for shares 31,831 Fair value of total consideration transferred $ 88,873 Explanation of fair value adjustments (a) Adjustment reflects the gain on certain securities that were sold immediately following close that was deemed to be a more accurate representation of fair value. (b) Adjustment reflects the fair value adjustment based on State Bank's evaluation of the acquired loan portfolio and includes the adjustment to eliminate the recorded allowance for loan and lease losses. (c) Adjustment reflects the fair value adjustment based on State Bank's evaluation of the acquired other real estate owned portfolio. (d) Adjustment reflects the fair value adjustment to record the estimated core deposit intangible. (e) Adjustment reflects the fair value adjustment based on appraised values. (f) Adjustment reflects the fair value adjustment based on State Bank's evaluation of acquired other assets. (g) Adjustment reflects the fair value adjustment based on State Bank's evaluation of acquired deposits. (h) Adjustment reflects the fair value adjustment based on State Bank's evaluation of other liabilities and to record certain liabilities directly attributable to the acquisition. The following table discloses the impact of the merger with Georgia-Carolina Bancshares, Inc. (excluding the impact of merger-related expenses) from the acquisition date of January 1, 2015 through December 31, 2015 (dollars in thousands, except per share amounts) . The table also presents certain pro forma information as if Georgia-Carolina Bancshares, Inc. had been acquired on January 1, 2015 . These results combine the historical results of Georgia-Carolina Bancshares, Inc. in the Company's consolidated statements of income and, while certain adjustments were made for the estimated impact of certain fair value adjustments and other acquisition-related activity, they are not indicative of what would have occurred had the acquisition taken place on January 1, 2015 . Merger-related costs of $1.7 million are included in the Company's consolidated statements of income for the year ended December 31, 2015 and are not included in the pro forma statements below. Twelve Months Ended December 31 2015 Pro Forma Net interest income $ 150,677 Net income 30,153 Earnings per share: Basic $ .78 Diluted .75 The following is a summary of the purchased credit impaired loans acquired in the Georgia-Carolina Bancshares, Inc. transaction on January 1, 2015 (dollars in thousands) : Purchased Credit Impaired Loans Contractually required principal and interest at acquisition $ 3,060 Contractual cash flows not expected to be collected (nonaccretable difference) (783 ) Expected cash flows at acquisition 2,277 Accretable difference (317 ) Basis in acquired loans at acquisition - estimated fair value $ 1,960 On January 1, 2015 , the fair value of the purchased non-credit impaired loans acquired in the Georgia-Carolina Bancshares, Inc. transaction was $292.4 million . The contractual balance of the purchased non-credit impaired loans at acquisition was $355.0 million , of which $6.4 million was the amount of contractual cash flows not expected to be collected.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investment Securities	NOTE 3: INVESTMENT SECURITIES The amortized cost and fair value of securities classified as available-for-sale are as follows (dollars in thousands) : December 31, 2017 December 31, 2016 Investment Securities Available-for-Sale Amortized Cost Unrealized Gains Unrealized Losses Fair Value Amortized Cost Unrealized Gains Unrealized Losses Fair Value U.S. Government securities $ 70,203 $ — $ 644 $ 69,559 $ 89,044 $ 70 $ 465 $ 88,649 States and political subdivisions — — — — 300 1 — 301 Residential mortgage-backed securities — nonagency 115,639 3,183 112 118,710 151,519 3,129 639 154,009 Residential mortgage-backed securities — agency 582,845 319 7,315 575,849 533,479 548 4,725 529,302 Corporate securities 108,661 1,299 108 109,852 74,793 207 83 74,917 Total investment securities available-for-sale $ 877,348 $ 4,801 $ 8,179 $ 873,970 $ 849,135 $ 3,955 $ 5,912 $ 847,178 December 31, 2017 December 31, 2016 Investment Securities Held-to-Maturity Amortized Cost Unrealized Gains Unrealized Losses Fair Value Amortized Cost Unrealized Gains Unrealized Losses Fair Value Asset-backed securities $ 22,692 $ 259 $ — $ 22,951 $ 56,804 $ 295 $ 14 $ 57,085 Corporate securities 10,160 240 — 10,400 10,259 91 — 10,350 Total investment securities held-to-maturity $ 32,852 $ 499 $ — $ 33,351 $ 67,063 $ 386 $ 14 $ 67,435 The amortized cost and estimated fair value of available-for-sale debt securities by contractual maturities are summarized in the table below (dollars in thousands) : Debt Securities Available-for-Sale Distribution of Maturities (1) December 31, 2017 1 Year or Less 1-5 Years 5-10 Years After 10 Years Total Amortized Cost: U.S. Government securities $ 2,498 $ 62,730 $ 4,975 $ — $ 70,203 Residential mortgage-backed securities — nonagency — — — 115,639 115,639 Residential mortgage-backed securities — agency — 42,269 140,793 399,783 582,845 Corporate securities 21,623 71,155 14,000 1,883 108,661 Total debt securities $ 24,121 $ 176,154 $ 159,768 $ 517,305 $ 877,348 Fair Value: U.S. Government securities $ 2,498 $ 62,091 $ 4,970 $ — $ 69,559 Residential mortgage-backed securities — nonagency — — — 118,710 118,710 Residential mortgage-backed securities — agency — 41,677 138,607 395,565 575,849 Corporate securities 21,632 71,538 14,571 2,111 109,852 Total debt securities $ 24,130 $ 175,306 $ 158,148 $ 516,386 $ 873,970 Debt Securities Held-to-Maturity Distribution of Maturities (1) December 31, 2017 1 Year or 1-5 5-10 After 10 Total Amortized Cost: Asset-backed securities $ — $ — $ 7,192 $ 15,500 $ 22,692 Corporate securities — — 10,160 — 10,160 Total debt securities $ — $ — $ 17,352 $ 15,500 $ 32,852 Fair Value: Asset-backed securities $ — $ — $ 7,286 $ 15,665 $ 22,951 Corporate securities — — 10,400 — 10,400 Total debt securities $ — $ — $ 17,686 $ 15,665 $ 33,351 (1) Actual cash flows may differ from contractual maturities as borrowers may prepay obligations without prepayment penalties. The following tables provide information regarding securities with unrealized losses (dollars in thousands) : Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Investment Securities Available-for-Sale December 31, 2017 U.S. Government securities $ 46,625 $ 364 $ 20,436 $ 280 $ 67,061 $ 644 Residential mortgage-backed securities — nonagency 1,403 3 6,269 109 7,672 112 Residential mortgage-backed securities — agency 312,617 2,548 210,862 4,767 523,479 7,315 Corporate securities 34,010 108 — — 34,010 108 Total temporarily impaired securities $ 394,655 $ 3,023 $ 237,567 $ 5,156 $ 632,222 $ 8,179 December 31, 2016 U.S. Government securities $ 43,958 $ 465 $ — $ — $ 43,958 $ 465 Residential mortgage-backed securities — nonagency 29,403 239 23,991 400 53,394 639 Residential mortgage-backed securities — agency 430,490 4,484 18,795 241 449,285 4,725 Corporate securities 22,944 83 — — 22,944 83 Total temporarily impaired securities $ 526,795 $ 5,271 $ 42,786 $ 641 $ 569,581 $ 5,912 Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Investment Securities Held-to-Maturity December 31, 2017 Asset-backed securities $ — $ — $ — $ — $ — $ — Corporate securities — — — — — — Total temporarily impaired securities $ — $ — $ — $ — $ — $ — December 31, 2016 Asset-backed securities $ 6,486 $ 14 $ — $ — $ 6,486 $ 14 Corporate securities — — — — — — Total temporarily impaired securities $ 6,486 $ 14 $ — $ — $ 6,486 $ 14 At December 31, 2017 , the Company held 129 investment securities that were in an unrealized loss position. Market changes in interest rates and credit spreads may result in temporary unrealized losses as market prices of securities fluctuate. The Company reviews its investment portfolio on a quarterly basis for indications of other than temporary impairment ("OTTI"). The severity and duration of impairment and the likelihood of potential recovery of impairment is considered along with the intent and ability to hold any impaired security to maturity or recovery of carrying value. More specifically, when analyzing the nonagency portfolio, the Company uses cash flow models that estimate cash flows on security-specific collateral and the transaction structure. Future expected credit losses are determined by using various assumptions, the most significant of which include current default rates, prepayment rates and loss severities. Credit information is available and modeled at the loan level underlying each security during the OTTI analysis; the Company also considers information such as loan to collateral values, FICO scores and geographic considerations, such as home price appreciation or depreciation. These inputs are updated quarterly or as changes occur to ensure that the most current credit and other assumptions are utilized in the analysis. If, based on the analysis, the Company does not expect to recover the entire amortized cost basis of the security, the expected cash flows are discounted at the security's initial effective interest rate to arrive at a present value amount. OTTI credit losses reflect the difference between the present value of cash flows expected to be collected and the amortized cost basis of these securities. At December 31, 2017 , there was no intent to sell any of the available-for-sale securities in an unrealized loss position, and it is more likely than not the Company will not be required to sell these securities. Furthermore, the present value of cash flows expected to be collected exceeded the Company's amortized cost basis of the investment securities; therefore, these securities are not deemed to be other than temporarily impaired. Sales and calls of securities available-for-sale are summarized in the following table (dollars in thousands) : December 31 2017 2016 2015 Proceeds from sales and calls $ 233,946 $ 113,589 $ 364,023 Gross gains on sales and calls $ 122 $ 489 $ 618 Gross losses on sales and calls (1,575 ) — (264 ) Net realized gains on sales and calls $ (1,453 ) $ 489 $ 354 The composition of investment securities reflects the strategy of management to maintain an appropriate level of liquidity while providing a relatively stable source of revenue. The securities portfolio may at times be used to mitigate interest rate risk associated with other areas of the balance sheet while also providing a means for the investment of available funds, providing liquidity and supplying investment securities that are required to be pledged as collateral against specific deposits and for other purposes. Investment securities with an aggregate fair value of $116.1 million and $368.3 million at December 31, 2017 and 2016 , respectively, were pledged to secure public deposits and repurchase agreements.

Loans

Loans	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Loans	NOTE 4: LOANS Loans, in total, are summarized as follows (dollars in thousands) : December 31 Total Loans 2017 2016 Construction, land & land development $ 451,993 $ 567,763 Other commercial real estate 1,255,002 1,025,063 Total commercial real estate 1,706,995 1,592,826 Residential real estate 333,086 343,398 Owner-occupied real estate 399,370 395,863 Commercial, financial & agricultural 973,440 368,120 Leases 52,396 71,724 Consumer 66,906 42,641 Total loans 3,532,193 2,814,572 Allowance for loan and lease losses (28,750 ) (26,598 ) Total loans, net $ 3,503,443 $ 2,787,974 Organic loans, which we define as loans not purchased in the acquisition of an institution or credit impaired portfolio, are summarized as follows (dollars in thousands) : December 31 Organic Loans 2017 2016 Construction, land & land development $ 412,540 $ 500,018 Other commercial real estate 949,594 754,790 Total commercial real estate 1,362,134 1,254,808 Residential real estate 196,225 144,295 Owner-occupied real estate 260,273 256,317 Commercial, financial & agricultural 430,205 327,381 Leases 52,396 71,724 Consumer 64,610 36,039 Total organic loans (1) 2,365,843 2,090,564 Allowance for loan and lease losses (24,039 ) (21,086 ) Total organic loans, net $ 2,341,804 $ 2,069,478 (1) I ncludes net deferred loan fees that totaled approximately $9.3 million and $7.0 million at December 31, 2017 and 2016 , respectively. Purchased non-credit impaired loans ("PNCI loans"), net of related discounts, are summarized as follows (dollars in thousands) : December 31 Purchased Non-Credit Impaired Loans 2017 2016 Construction, land & land development $ 25,908 $ 51,208 Other commercial real estate 218,660 209,531 Total commercial real estate 244,568 260,739 Residential real estate 96,529 144,596 Owner-occupied real estate 118,294 115,566 Commercial, financial & agricultural 529,184 36,206 Consumer 2,161 6,255 Total purchased non-credit impaired loans (1) 990,736 563,362 Allowance for loan and lease losses (995 ) (439 ) Total purchased non-credit impaired loans, net $ 989,741 $ 562,923 (1) I ncludes net discounts that totaled approximately $12.7 million and $10.5 million at December 31, 2017 and 2016 , respectively. Purchased credit impaired loans ("PCI loans"), net of related discounts, are summarized as follows (dollars in thousands) : December 31 Purchased Credit Impaired Loans 2017 2016 Construction, land & land development $ 13,545 $ 16,537 Other commercial real estate 86,748 60,742 Total commercial real estate 100,293 77,279 Residential real estate 40,332 54,507 Owner-occupied real estate 20,803 23,980 Commercial, financial & agricultural 14,051 4,533 Consumer 135 347 Total purchased credit impaired loans 175,614 160,646 Allowance for loan and lease losses (3,716 ) (5,073 ) Total purchased credit impaired loans, net $ 171,898 $ 155,573 Changes in the carrying value of net purchased credit impaired loans are presented in the following table (dollars in thousands) : December 31 Purchased Credit Impaired Loans 2017 2016 Balance, beginning of year $ 155,573 $ 137,777 Accretion of fair value discounts 34,096 43,310 Fair value of acquired loans 77,551 40,133 Reductions in principal balances resulting from repayments, write-offs and foreclosures (96,679 ) (68,372 ) Change in the allowance for loan and lease losses on purchased credit impaired loans 1,357 2,725 Balance, end of year $ 171,898 $ 155,573 Purchased credit impaired loans are initially recorded at fair value at the acquisition date. Subsequent decreases in the amount of cash expected to be collected from the borrower results in a provision for loan and lease losses and an increase in the allowance for loan and lease losses. Subsequent increases in the amount of cash expected to be collected from the borrower results in the reversal of any previously-recorded provision for loan and lease losses and related allowance for loan and lease losses, and then as a prospective increase in the accretable discount on the purchased credit impaired loans. The accretable discount is accreted into interest income over the estimated life of the related loan on a level yield basis. Changes in the value of the accretable discount are presented in the following table for the periods presented (dollars in thousands) : December 31 Changes in Accretable Discount 2017 2016 2015 Balance, beginning of year $ 69,301 $ 86,100 $ 120,061 Additions from acquisitions 11,664 5,824 317 Accretion (34,096 ) (43,310 ) (49,830 ) Transfers to accretable discounts and exit events, net 11,058 20,687 15,552 Balance, end of year $ 57,927 $ 69,301 $ 86,100 The accretable discount changes over time as the purchased credit impaired loan portfolios season. The change in the accretable discount is a result of the Company's review and re-estimation of loss assumptions and expected cash flows on acquired loans. At December 31, 2017 and 2016 , loans with a carrying value of $3.1 billion and $2.5 billion , respectively, were pledged for lines of credit with the FHLB and FRB. At December 31, 2017 and 2016 , in accordance with Company policy, there were no loans to executive officers, directors and/or their affiliates. At December 31, 2017 , consumer mortgage loans secured by residential real estate properties totaling $49,000 were in formal foreclosure proceedings.

Allowance for Loan and Lease Lo

Allowance for Loan and Lease Losses (ALLL)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Allowance for Loan and Lease Losses (ALLL)	NOTE 5: ALLOWANCE FOR LOAN AND LEASE LOSSES (ALLL) The following table summarizes the Company’s loan loss experience on the total loan portfolio as well as the breakdown between the organic, purchased non-credit impaired, and purchased credit impaired portfolios for the periods presented (dollars in thousands) : December 31 2017 2016 2015 Total Loans Balance, beginning of period $ 26,598 $ 29,075 $ 28,638 Charge-offs (4,418 ) (6,174 ) (12,494 ) Recoveries 460 3,460 8,400 Net charge-offs (3,958 ) (2,714 ) (4,094 ) Provision for loan and lease losses before amount attributable to FDIC loss share agreements 6,110 237 4,531 Amount attributable to FDIC loss share agreements — — (1,045 ) Total provision for loan and lease losses charged to operations 6,110 237 3,486 Provision for loan and lease losses recorded through the FDIC loss share receivable — — 1,045 Balance, end of period $ 28,750 $ 26,598 $ 29,075 Organic Loans Balance, beginning of period $ 21,086 $ 21,224 $ 18,392 Charge-offs (2,462 ) (3,411 ) (313 ) Recoveries 373 223 288 Net charge-offs (2,089 ) (3,188 ) (25 ) Provision for loan and lease losses 5,042 3,050 2,857 Balance, end of period $ 24,039 $ 21,086 $ 21,224 Purchased Non-Credit Impaired Loans Balance, beginning of period $ 439 $ 53 $ — Charge-offs (670 ) (223 ) (48 ) Recoveries 87 63 7 Net charge-offs (583 ) (160 ) (41 ) Provision for loan and lease losses 1,139 546 94 Balance, end of period $ 995 $ 439 $ 53 Purchased Credit Impaired Loans Balance, beginning of period $ 5,073 $ 7,798 $ 10,246 Charge-offs (1,286 ) (2,540 ) (12,133 ) Recoveries — 3,174 8,105 Net (charge-offs) recoveries (1,286 ) 634 (4,028 ) Provision for loan and lease losses before amount attributable to FDIC loss share agreements (71 ) (3,359 ) 1,580 Amount attributable to FDIC loss share agreements — — (1,045 ) Total provision for loan and lease losses charged to operations (71 ) (3,359 ) 535 Provision for loan and lease losses recorded through the FDIC loss share receivable — — 1,045 Balance, end of period $ 3,716 $ 5,073 $ 7,798 Segment and Class Risk Descriptions Each of our portfolio segments and the classes within those segments are subject to risks that could have an adverse impact on the credit quality of our loan portfolio. Management has identified the most significant risks associated with segments and classes as described below. While the list is not exhaustive, it provides a description of the risks that management has determined are the most significant. Real Estate Loans Loans secured by real estate are the principal component of our loan portfolio. Real estate loans are subject to the same general risks as other loans and are particularly sensitive to fluctuations in the value of real estate. Increases in interest rates, decline in occupancy rates, fluctuations in the value of real estate, as well as other factors arising after a loan has been made, could negatively affect a borrower's cash flow, creditworthiness and ability to repay the loan. When we make new real estate loans, we typically obtain a security interest in the real estate, as well as other available credit enhancements, to increase the likelihood of the ultimate repayment of the loan. To control concentration risk, we monitor collateral type concentrations within this portfolio. In addition to these common risks for the majority of our real estate loans, additional risks are inherent in certain of our classes of real estate loans which are addressed below: Commercial Real Estate Commercial real estate loans consist of commercial construction and land development loans and other commercial real estate loans. Commercial construction and land development loans are highly dependent upon the supply and demand for commercial real estate in the markets we serve as well as the demand for newly constructed residential homes and lots that our customers are developing. Construction and development loans generally carry a higher degree of risk than long-term financing of existing properties because repayment depends upon the ultimate completion of the project and usually on the subsequent lease-up and/or sale of the property. Additionally, deterioration in demand could result in significant decreases in the underlying collateral values and make repayment of the outstanding loans more difficult for our customers. Other commercial real estate loans consist primarily of loans secured by other nonfarm nonresidential properties such as retail, office and hotel/motel and multifamily housing. These loans typically have terms of five years or less, although payments may be structured on a longer amortization basis. We evaluate each borrower on an individual basis and attempt to determine the business risks and credit profile of each borrower. The primary risk associated with loans secured with income-producing property is the inability of that property to produce adequate cash flow to service the debt. High unemployment, generally weak economic conditions and/or an oversupply in the market may result in our customer having difficulty achieving adequate occupancy rates. Residential Real Estate Residential real estate loans are typically to individuals and are secured by owner-occupied and investor-owned 1-4 family residential property. We generally originate and hold certain first mortgages and traditional second mortgages, adjustable rate mortgages and home equity lines of credit. We also originate and sell fixed and adjustable rate residential real estate loans in the secondary market. Significant and rapid declines in real estate values can result in residential mortgage loan borrowers having debt levels in excess of the current market value of the collateral. Owner-Occupied Real Estate Owner-occupied loans consist of loans secured by nonfarm nonresidential properties, such as office and industrial properties, churches, convenience stores and restaurants occupied by an affiliated tenant. Loan repayment is primarily dependent on the ability of the operating company to achieve business results consistent with those projected at loan origination resulting in cash flow sufficient to service the debt. Adverse changes in the business's results, specifically declines in cash flows, could jeopardize the ability for the loan to be serviced in accordance with the contractual terms. Commercial, Financial & Agricultural Loans Commercial, financial and industrial loans include loans to individuals and businesses for commercial purposes in various lines of business, including the manufacturing, professional service, and crop production industries. This segment also includes loans to states and political subdivisions, as well as equipment finance agreements, asset-based loans and lender finance loans. Repayment is primarily dependent on the ability of the borrower to achieve business results consistent with those projected at loan origination resulting in cash flow sufficient to service the debt. To the extent that a borrower's business results are significantly unfavorable versus the original projections, the ability for the loan to be serviced on a basis consistent with the contractual terms may be at risk. While these loans may be partially secured by real estate, they are generally considered to have greater collateral risk than first or second mortgages on real estate because these loans may be unsecured or, if they are secured, the value of the non-real estate collateral may be difficult to assess and less marketable than real estate, and the control of the collateral is more at risk. Leases Leases include purchased commercial, business purpose and municipal leases. The stream of payments and a first security interest in the collateral is assigned to us. Our lease funding is based on a present value of the lease payments at a discounted interest rate, which is determined based on the credit quality of the lessee, the term of the lease compared to expected useful life, and the type of collateral. Types of collateral include, but are not limited to, medical equipment, rolling stock, franchise restaurant equipment and hardware/software. Servicing of purchased leases is primarily retained by the loan originator, as well as ownership of all residuals, if applicable. Lease financing is underwritten using similar underwriting standards as would be applied to a secured commercial loan requesting high loan-to-value financing. Risks that are involved with lease financing receivables are credit underwriting and borrower industry concentrations. Consumer Loans The consumer loan portfolio includes loans to individuals for personal, family and household purposes, including secured and unsecured installment loans and revolving lines of credit. Consumer loans not secured by real estate are generally considered to have greater risk than first or second mortgages on real estate because they may be unsecured, or, if they are secured, the value of the collateral may be difficult to assess and more likely to decrease in value, and is more difficult to control, than real estate. Consumer loans may be secured by cash value life insurance policies which presents a lower collateral risk than other non-real estate secured consumer loans. Activity in the allowance for loan and lease losses on organic loans is detailed as follows by portfolio segment for the periods presented (dollars in thousands) : Organic Loans Commercial Real Estate Residential Real Estate Owner- Occupied Real Estate Commercial, Financial & Agricultural Leases Consumer Total December 31, 2017 Beginning balance $ 11,767 $ 1,786 $ 2,239 $ 4,093 $ 655 $ 546 $ 21,086 Charge-offs (933 ) (61 ) — (380 ) (728 ) (360 ) (2,462 ) Recoveries — 14 — 133 182 44 373 Provision 2,203 1,070 (164 ) 689 520 724 5,042 Ending balance $ 13,037 $ 2,809 $ 2,075 $ 4,535 $ 629 $ 954 $ 24,039 December 31, 2016 Beginning balance $ 13,607 $ 2,053 $ 1,920 $ 2,509 $ 865 $ 270 $ 21,224 Charge-offs (2,122 ) (53 ) — (653 ) (486 ) (97 ) (3,411 ) Recoveries — 6 45 154 11 7 223 Provision 282 (220 ) 274 2,083 265 366 3,050 Ending balance $ 11,767 $ 1,786 $ 2,239 $ 4,093 $ 655 $ 546 $ 21,086 December 31, 2015 Beginning balance $ 13,134 $ 1,190 $ 1,928 $ 1,770 $ 262 $ 108 $ 18,392 Charge-offs (3 ) — — (289 ) — (21 ) (313 ) Recoveries 173 10 — 98 — 7 288 Provision 303 853 (8 ) 930 603 176 2,857 Ending balance $ 13,607 $ 2,053 $ 1,920 $ 2,509 $ 865 $ 270 $ 21,224 The following table presents the balance of organic loans and the allowance for loan and lease losses based on the method of determining the allowance at the dates indicated (dollars in thousands) : Allowance for Loan and Lease Losses Loans Organic Loans Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Allowance Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Loans December 31, 2017 Commercial real estate $ — $ 13,037 $ 13,037 $ 3,822 $ 1,358,312 $ 1,362,134 Residential real estate — 2,809 2,809 49 196,176 196,225 Owner-occupied real estate 65 2,010 2,075 808 259,465 260,273 Commercial, financial & agricultural 34 4,501 4,535 280 429,925 430,205 Leases — 629 629 — 52,396 52,396 Consumer — 954 954 — 64,610 64,610 Total organic loans $ 99 $ 23,940 $ 24,039 $ 4,959 $ 2,360,884 $ 2,365,843 December 31, 2016 Commercial real estate $ 148 $ 11,619 $ 11,767 $ 4,950 $ 1,249,858 $ 1,254,808 Residential real estate — 1,786 1,786 — 144,295 144,295 Owner-occupied real estate — 2,239 2,239 — 256,317 256,317 Commercial, financial & agricultural 1 4,092 4,093 9 327,372 327,381 Leases — 655 655 — 71,724 71,724 Consumer — 546 546 — 36,039 36,039 Total organic loans $ 149 $ 20,937 $ 21,086 $ 4,959 $ 2,085,605 $ 2,090,564 Activity in the allowance for loan and lease losses on purchased non-credit impaired loans is detailed as follows by portfolio segment for the periods presented (dollars in thousands) : Purchased Non-Credit Impaired Loans Commercial Real Estate Residential Real Estate Owner- Occupied Real Estate Commercial, Financial & Agricultural Consumer Total December 31, 2017 Beginning balance $ 88 $ 72 $ 44 $ 235 $ — $ 439 Charge-offs (50 ) (7 ) (80 ) (524 ) (9 ) (670 ) Recoveries 26 11 — 43 7 87 Provision 166 588 124 254 7 1,139 Ending balance $ 230 $ 664 $ 88 $ 8 $ 5 $ 995 December 31, 2016 Beginning balance $ — $ 53 $ — $ — $ — $ 53 Charge-offs — (83 ) — (137 ) (3 ) (223 ) Recoveries — 45 — — 18 63 Provision 88 57 44 372 (15 ) 546 Ending balance $ 88 $ 72 $ 44 $ 235 $ — $ 439 December 31, 2015 Beginning balance $ — $ — $ — $ — $ — $ — Charge-offs — (24 ) — — (24 ) (48 ) Recoveries — 1 — — 6 7 Provision — 76 — — 18 94 Ending balance $ — $ 53 $ — $ — $ — $ 53 The following table presents the balance of purchased non-credit impaired loans and the allowance for loan and lease losses based on the method of determining the allowance at the date indicated (dollars in thousands). Allowance for Loan and Lease Losses Loans Purchased Non-Credit Impaired Loans Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Allowance Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Loans December 31, 2017 Commercial real estate $ — $ 230 $ 230 $ — $ 244,568 $ 244,568 Residential real estate — 664 664 19 96,510 96,529 Owner-occupied real estate — 88 88 3,264 115,030 118,294 Commercial, financial & agricultural 8 — 8 1,491 527,693 529,184 Consumer — 5 5 — 2,161 2,161 Total purchased non-credit impaired loans $ 8 $ 987 $ 995 $ 4,774 $ 985,962 $ 990,736 December 31, 2016 Commercial real estate $ — $ 88 $ 88 $ — $ 260,739 $ 260,739 Residential real estate — 72 72 157 144,439 144,596 Owner-occupied real estate 44 — 44 1,686 113,880 115,566 Commercial, financial & agricultural — 235 235 568 35,638 36,206 Consumer — — — — 6,255 6,255 Total purchased non-credit impaired loans $ 44 $ 395 $ 439 $ 2,411 $ 560,951 $ 563,362 Activity in the allowance for loan and lease losses on purchased credit impaired loans is detailed as follows by portfolio segment for the periods presented (dollars in thousands) : Purchased Credit Impaired Loans Commercial Real Estate Residential Real Estate Owner-Occupied Real Estate Commercial, Financial & Agricultural Consumer Total December 31, 2017 Beginning balance $ 2,183 $ 1,196 $ 1,655 $ 38 $ 1 $ 5,073 Charge-offs (446 ) (140 ) (457 ) (238 ) (5 ) (1,286 ) Recoveries — — — — — — Provision for loan and lease losses before amount attributable to FDIC loss share agreements (31 ) 186 (480 ) 242 12 (71 ) Amount attributable to FDIC loss share agreements — — — — — — Total provision for loan and lease losses charged to operations (31 ) 186 (480 ) 242 12 (71 ) Provision for loan and lease losses recorded through the FDIC loss share receivable — — — — — — Ending balance $ 1,706 $ 1,242 $ 718 $ 42 $ 8 $ 3,716 December 31, 2016 Beginning balance $ 3,388 $ 1,893 $ 2,449 $ 60 $ 8 $ 7,798 Charge-offs (936 ) (977 ) (298 ) (273 ) (56 ) (2,540 ) Recoveries 2,281 401 207 232 53 3,174 Provision for loan and lease losses before amount attributable to FDIC loss share agreements (2,550 ) (121 ) (703 ) 19 (4 ) (3,359 ) Amount attributable to FDIC loss share agreements — — — — — — Total provision for loan and lease losses charged to operations (2,550 ) (121 ) (703 ) 19 (4 ) (3,359 ) Provision for loan and lease losses recorded through the FDIC loss share receivable — — — — — — Ending balance $ 2,183 $ 1,196 $ 1,655 $ 38 $ 1 $ 5,073 December 31, 2015 Beginning balance $ 5,461 $ 2,298 $ 1,916 $ 567 $ 4 $ 10,246 Charge-offs (7,251 ) (1,441 ) (1,374 ) (1,929 ) (138 ) (12,133 ) Recoveries 5,326 382 1,120 1,080 197 8,105 Provision for loan and lease losses before amount attributable to FDIC loss share agreements (148 ) 654 787 342 (55 ) 1,580 Amount attributable to FDIC loss share agreements (313 ) (182 ) (402 ) (140 ) (8 ) (1,045 ) Total provision for loan and lease losses charged to operations (461 ) 472 385 202 (63 ) 535 Provision for loan and lease losses recorded through the FDIC loss share receivable 313 182 402 140 8 1,045 Ending balance $ 3,388 $ 1,893 $ 2,449 $ 60 $ 8 $ 7,798 The following table presents the balance of purchased credit impaired loans and the allowance for loan and lease losses based on the method of determining the allowance at the dates indicated (dollars in thousands) : Allowance for Loan and Lease Losses Loans Purchased Credit Impaired Loans Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Allowance Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Loans December 31, 2017 Commercial real estate $ 1,052 $ 654 $ 1,706 $ 38,444 $ 61,849 $ 100,293 Residential real estate 128 1,114 1,242 3,029 37,303 40,332 Owner-occupied real estate 586 132 718 9,483 11,320 20,803 Commercial, financial & agricultural 32 10 42 2,318 11,733 14,051 Consumer — 8 8 — 135 135 Total purchased credit impaired loans $ 1,798 $ 1,918 $ 3,716 $ 53,274 $ 122,340 $ 175,614 December 31, 2016 Commercial real estate $ 760 $ 1,423 $ 2,183 $ 29,387 $ 47,892 $ 77,279 Residential real estate 156 1,040 1,196 1,897 52,610 54,507 Owner-occupied real estate 1,471 184 1,655 8,376 15,604 23,980 Commercial, financial & agricultural 2 36 38 86 4,447 4,533 Consumer — 1 1 8 339 347 Total purchased credit impaired loans $ 2,389 $ 2,684 $ 5,073 $ 39,754 $ 120,892 $ 160,646 For each period indicated, a significant portion of the Company's purchased credit impaired loans were past due, including many that were 90 days or more past due; however, such delinquencies were included in the Company's performance expectations in determining the fair values of purchased credit impaired loans at each acquisition and at subsequent valuation dates. All purchased credit impaired loan cash flows and the timing of such cash flows continue to be estimable and probable of collection and thus accretion income continues to be recognized on these assets. As such, the referenced purchased credit impaired loans are not considered nonperforming assets. Impaired loans, segregated by class of loans, are presented in the following table (dollars in thousands) : December 31, 2017 December 31, 2016 Impaired Loans (1): Unpaid Principal Balance Recorded Investment Related Allowance Unpaid Principal Balance Recorded Investment Related Allowance With no related allowance recorded: Construction, land & land development $ 82 $ 79 $ — $ 4,565 $ 2,933 $ — Other commercial real estate 4,617 3,822 — 56 56 — Total commercial real estate 4,699 3,901 — 4,621 2,989 — Residential real estate 453 456 — 388 320 — Owner-occupied real estate 4,172 4,015 — 193 188 — Commercial, financial & agricultural 2,739 1,882 — 1,335 1,128 — Consumer 51 40 — 2 2 — Subtotal 12,114 10,294 — 6,539 4,627 — With related allowance recorded: Construction, land & land development 113 112 56 4,277 2,124 201 Other commercial real estate — — — — — — Total commercial real estate 113 112 56 4,277 2,124 201 Residential real estate 1,452 1,399 699 891 825 413 Owner-occupied real estate 350 335 125 1,706 1,687 44 Commercial, financial & agricultural 872 821 318 308 298 146 Consumer 83 81 40 55 54 27 Subtotal 2,870 2,748 1,238 7,237 4,988 831 Total impaired loans $ 14,984 $ 13,042 $ 1,238 $ 13,776 $ 9,615 $ 831 (1) Includes loans with SBA guaranteed balances of $5.7 million and $3.0 million at December 31, 2017 and December 31, 2016 , respectively. The following table presents information related to the average recorded investment and interest income recognized on impaired loans for the periods presented (dollars in thousands) : December 31, 2017 December 31, 2016 December 31, 2015 Impaired Loans: Average Recorded Investment (1) Interest Income Recognized (2) Average Recorded Investment (1) Interest Income Recognized (2) Average Recorded Investment (1) Interest Income Recognized (2) Construction, land & land development $ 3,526 $ — $ 5,824 $ — $ 3,354 $ 75 Other commercial real estate 2,076 8 165 — 1,106 56 Total commercial real estate 5,602 8 5,989 — 4,460 131 Residential real estate 1,218 — 1,641 — 818 18 Owner-occupied real estate 3,150 — 538 3 542 15 Commercial, financial & agricultural 2,565 1 1,670 24 733 20 Consumer 85 — 43 — 39 1 Total impaired loans $ 12,620 $ 9 $ 9,881 $ 27 $ 6,592 $ 185 (1) The average recorded investment for troubled debt restructurings was $2.8 million , $6.0 million and $3.5 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. (2) The total interest income recognized on troubled debt restructurings was $8,000 , $24,000 and $82,000 for the years ended December 31, 2017 , 2016 , 2015 , respectively. The following table presents the recorded investment in nonaccrual loans by loan class at the dates indicated (dollars in thousands) : December 31 Nonaccrual Loans 2017 2016 Construction, land & land development $ 191 $ 5,057 Other commercial real estate 3,257 56 Total commercial real estate 3,448 5,113 Residential real estate 1,855 1,146 Owner-occupied real estate 4,350 1,874 Commercial, financial & agricultural 2,703 1,426 Consumer 121 56 Total nonaccrual loans $ 12,477 $ 9,615 The following table presents an analysis of past due organic loans, by class of loans, at the dates indicated (dollars in thousands) : Organic Loans 30 - 89 Days Past Due 90 Days or greater Past Due Total Past Due Current Total Loans Loans > 90 Days and Accruing December 31, 2017 Construction, land & land development $ 487 $ 45 $ 532 $ 412,008 $ 412,540 $ — Other commercial real estate — — — 949,594 949,594 — Total commercial real estate 487 45 532 1,361,602 1,362,134 — Residential real estate 1,868 92 1,960 194,265 196,225 — Owner-occupied real estate 474 713 1,187 259,086 260,273 — Commercial, financial & agricultural 865 122 987 429,218 430,205 — Leases — — — 52,396 52,396 — Consumer 67 28 95 64,515 64,610 — Total organic loans $ 3,761 $ 1,000 $ 4,761 $ 2,361,082 $ 2,365,843 $ — December 31, 2016 Construction, land & land development $ 49 $ 12 $ 61 $ 499,957 $ 500,018 $ — Other commercial real estate — — — 754,790 754,790 — Total commercial real estate 49 12 61 1,254,747 1,254,808 — Residential real estate 157 118 275 144,020 144,295 — Owner-occupied real estate 40 — 40 256,277 256,317 — Commercial, financial & agricultural 247 283 530 326,851 327,381 — Leases — — — 71,724 71,724 — Consumer 350 31 381 35,658 36,039 — Total organic loans $ 843 $ 444 $ 1,287 $ 2,089,277 $ 2,090,564 $ — The following table presents an analysis of past due purchased non-credit impaired loans, by class of loans, at the dates indicated (dollars in thousands) : Purchased Non-Credit Impaired Loans 30 - 89 Days Past Due 90 Days or greater Past Due Total Past Due Current Total Loans Loans > 90 Days and Accruing December 31, 2017 Construction, land & land development $ 35 $ — $ 35 $ 25,873 $ 25,908 $ — Other commercial real estate — 45 45 218,615 218,660 — Total commercial real estate 35 45 80 244,488 244,568 — Residential real estate 537 126 663 95,866 96,529 — Owner-occupied real estate 283 1,590 1,873 116,421 118,294 — Commercial, financial & agricultural 640 628 1,268 527,916 529,184 — Consumer 28 13 41 2,120 2,161 — Total purchased non-credit impaired loans $ 1,523 $ 2,402 $ 3,925 $ 986,811 $ 990,736 $ — December 31, 2016 Construction, land & land development $ 495 $ — $ 495 $ 50,713 $ 51,208 $ — Other commercial real estate 17 56 73 209,458 209,531 — Total commercial real estate 512 56 568 260,171 260,739 — Residential real estate 274 165 439 144,157 144,596 — Owner-occupied real estate 387 1,687 2,074 113,492 115,566 — Commercial & industrial 144 552 696 35,510 36,206 — Consumer 38 2 40 6,215 6,255 — Total purchased non-credit impaired loans $ 1,355 $ 2,462 $ 3,817 $ 559,545 $ 563,362 $ — The following table presents an analysis of past due purchased credit impaired loans, by class of loans, at the dates indicated (dollars in thousands) : Purchased Credit Impaired Loans 30 - 89 Days Past Due 90 Days or greater Past Due Total Past Due Current Total Loans December 31, 2017 Construction, land & land development $ 1 $ 1,881 $ 1,882 $ 11,663 $ 13,545 Other commercial real estate 363 3,303 3,666 83,082 86,748 Total commercial real estate 364 5,184 5,548 94,745 100,293 Residential real estate 1,519 1,876 3,395 36,937 40,332 Owner-occupied real estate 85 786 871 19,932 20,803 Commercial, financial & agricultural 201 224 425 13,626 14,051 Consumer — 15 15 120 135 Total purchased credit impaired loans $ 2,169 $ 8,085 $ 10,254 $ 165,360 $ 175,614 December 31, 2016 Construction, land & land development $ 722 $ 1,853 $ 2,575 $ 13,962 $ 16,537 Other commercial real estate 346 3,148 3,494 57,248 60,742 Total commercial real estate 1,068 5,001 6,069 71,210 77,279 Residential real estate 1,210 2,787 3,997 50,510 54,507 Owner-occupied real estate 661 3,507 4,168 19,812 23,980 Commercial, financial & agricultural 29 61 90 4,443 4,533 Consumer — 5 5 342 347 Total purchased credit impaired loans $ 2,968 $ 11,361 $ 14,329 $ 146,317 $ 160,646 Asset Quality Grades: The Company assigns loans into risk categories based on relevant information about the ability of borrowers to pay their debts, such as current financial information, historical payment experience, credit documentation, public information and current economic trends, among other factors. A loan’s risk grade is assigned at inception based upon the strength of the repayment sources and reassessed periodically throughout the year. Loans over certain dollar thresholds identified as having weaknesses are subject to more frequent review. In addition, the Company’s internal loan review department provides an ongoing, comprehensive, and independent assessment of credit risk within the Company. Loans are graded on a scale of 1 to 9. Pass grades are from 1 to 4. Descriptions of the general characteristics of grades 5 and above are as follows: Watch (Grade 5) —Loans graded Watch are pass credits that have not met performance expectations or that have higher inherent risk characteristics warranting continued supervision and attention. OAEM (Grade 6) —Loans graded OAEM (other assets especially mentioned) have potential weaknesses that deserve management's close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or in the Company's credit position at some future date. OAEM loans are not adversely classified and do not expose the institution to sufficient risk to warrant adverse classification. Substandard (Grade 7) —Loans classified as substandard are inadequately protected by the current sound worth and payment capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness, or weaknesses, that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected. Doubtful (Grade 8) —Loans classified as doubtful have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. Loss (Grade 9) —Loans classified as loss are considered uncollectible and have little value to the Company and their continuance as an active relationship is not warranted. The following table presents the risk grades of the organic loan portfolio, by class of loans, at the dates indicated (dollars in thousands) : Organic Loans Pass Watch OAEM Substandard Doubtful Total December 31, 2017 Construction, land & land development $ 371,358 $ 38,939 $ 2,086 $ 157 $ — $ 412,540 Other commercial real estate 920,168 22,229 3,365 3,832 — 949,594 Total commercial real estate 1,291,526 61,168 5,451 3,989 — 1,362,134 Residential real estate 188,918 3,668 1,488 2,151 — 196,225 Owner-occupied real estate 240,987 16,891 1,067 1,328 — 260,273 Commercial, financial & agricultural 421,114 7,870 123 1,098 — 430,205 Leases 47,908 4,488 — — — 52,396 Consumer 64,361 58 81 110 — 64,610 Total organic loans $ 2,254,814 $ 94,143 $ 8,210 $ 8,676 $ — $ 2,365,843 December 31, 2016 Construction, land & land development $ 470,686 $ 24,178 $ 97 $ 5,057 $ — $ 500,018 Other commercial real estate 718,969 35,821 — — — 754,790 Total commercial real estate 1,189,655 59,999 97 5,057 — 1,254,808 Residential real estate 139,393 2,484 460 1,958 — 144,295 Owner-occupied real estate 237,753 14,967 3,577 20 — 256,317 Commercial, financial & agricultural 325,161 920 624 676 — 327,381 Leases 60,849 10,875 — — — 71,724 Consumer 35,844 47 2 145 1 36,039 Total organic loans $ 1,988,655 $ 89,292 $ 4,760 $ 7,856 $ 1 $ 2,090,564 The following table presents the risk grades of the purchased non-credit impaired loan portfolio, by class of loans, at the dates indicated (dollars in thousands) : Purchased Non-Credit Impaired Loans Pass Watch OAEM Substandard Doubtful Total December 31, 2017 Construction, land & land development $ 25,486 $ 385 $ — $ 37 $ — $ 25,908 Other commercial real estate 214,916 1,341 1,825 578 — 218,660 Total commercial real estate 240,402 1,726 1,825 615 — 244,568 Residential real estate 92,119 2,216 791 1,369 34 96,529 Owner-occupied real estate 110,034 3,227 1,280 3,753 — 118,294 Commercial, financial & agricultural 452,822 59,306 5,223 11,833 — 529,184 Consumer 2,091 3 — 37 30 2,161 Total purchased non-credit impaired loans $ 897,468 $ 66,478 $ 9,119 $ 17,607 $ 64 $ 990,736 December 31, 2016 Construction, land & land development $ 51,208 $ — $ — $ — $ — $ 51,208 Other commercial real estate 206,515 803 2,157 56 — 209,531 Total commercial real estate 257,723 803 2,157 56 — 260,739 Residential real estate 142,079 1,883 314 320 — 144,596 Owner-occupied real estate 107,096 6,310 — 2,160 — 115,566 Commercial, financial & agricultural 34,747 310 21 1,128 — 36,206 Consumer 6,247 5 — 3 — 6,255 Total purchased non-credit impaired loans $ 547,892 $ 9,311 $ 2,492 $ 3,667 $ — $ 563,362 Classifications on purchased credit impaired loans are based upon the borrower's ability to pay the current unpaid principal balance without regard to the net carrying value of the loan on the Company's balance sheet. Because the values shown in the table below are based on each loan's estimated cash flows, any expected losses should be covered by a combination of the specific reserves established in the allowance for loan and lease losses on purchased credit impaired loans plus the discounts to the unpaid principal balances reflected in the recorded investment of each loan. The following table presents the risk grades of the purchased credit impaired loan portfolio, by class of loans, at the dates indicated (dollars in thousands) : Purchased Credit Impaired Loans Pass Watch OAEM Substandard Doubtful Total December 31, 2017 Construction, land & land development $ 6,677 $ 809 $ 973 $ 5,086 $ — $ 13,545 Other commercial real estate 63,210 11,998 2,361 9,179 — 86,748 Total commercial real estate 69,887 12,807 3,334 14,265 — 100,293 Residential real estate 21,706 6,419 1,590 10,504 113 40,332 Owner-occupied real estate 7,181 4,896 818 7,908 — 20,803 Commercial, financial & agricultural 2,094 211 323 11,423 — 14,051 Consumer 60 28 21 26 — 135 Total purchased credit impaired loans $ 100,928 $ 24,361 $ 6,086 $ 44,126 $ 113 $ 175,614 December 31, 2016 Construction, land & land development $ 7,798 $ 1,150 $ 1,416 $ 6,173 $ — $ 16,537 Other commercial real estate 33,423 13,103 2,770 11,446 — 60,742 Total commercial real estate 41,221 14,253 4,186 17,619 — 77,279 Residential real estate 28,628 10,371 2,840 12,396 272 54,507 Owner-occupied real estate 7,736 4,884 794 10,566 — 23,980 Commercial, financial & agricultural 3,381 310 273 569 — 4,533 Consumer 53 100 173 21 — 347 Total purchased credit impaired loans $ 81,019 $ 29,918 $ 8,266 $ 41,171 $ 272 $ 160,646 Troubled Debt Restructurings (TDRs) Total troubled debt restructurings were $1.5 million and $5.0 million at December 31, 2017 and 2016 , respectively. There was no related allowance for loan and lease losses at December 31, 2017 and $148,000 at December 31, 2016 . At December 31, 2017 and 2016 , there were no commitments to extend credit to a borrower with an existing troubled debt restructuring. Purchased credit impaired loans modified post-acquisition are not removed from their accounting pools and accounted for as TDRs, even if those loans would otherwise be deemed TDRs. The following table provides information on troubled debt restructured loans that were modified during the periods presented (dollars in thousands) : December 31, 2017 December 31, 2016 December 31, 2015 TDR Additions (1) Number of Contracts Pre-Modification Recorded Investment Post-Modification Recorded Investment Number o

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment, and Leases [Abstract]
Premises and Equipment	NOTE 6: PREMISES & EQUIPMENT Premises and equipment are summarized as follows (dollars in thousands) : December 31 2017 2016 Land $ 14,849 $ 14,632 Buildings and improvements 38,742 37,856 Furniture, fixtures, and equipment 18,939 16,961 Construction in progress 550 426 Premises and equipment, gross 73,080 69,875 Accumulated depreciation (21,286 ) (17,819 ) Premises and equipment, net $ 51,794 $ 52,056 Depreciation expense for premises and equipment was $3.7 million , $3.5 million , and $3.8 million for the years ended December 31, 2017 , 2016 , and 2015 , respectively. Leases The Company has various operating leases on office locations with lease terms that range up to 8 years. These noncancelable operating leases are subject to renewal options and some leases provide for periodic rate adjustments according to the terms of the agreements. Future minimum lease commitments under all noncancelable operating leases with terms of one year or more, excluding any renewal options, are as follows (dollars in thousands) : Years Ended December 31 Future Lease Commitments 2018 $ 4,627 2019 3,347 2020 3,261 2021 2,980 2022 3,049 Thereafter 3,518 Total (1) $ 20,782 (1) The total future minimum lease commitments have not been reduced by minimum sublease rentals of $3.4 million due in the future from noncancelable subleases. Rent expense was $3.5 million , $3.2 million , and $3.1 million , for the years ended December 31, 2017 , 2016 , and 2015 , respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	NOTE 7: GOODWILL & OTHER INTANGIBLE ASSETS Changes to the carrying amounts of goodwill and identifiable intangible assets are presented in the table below (dollars in thousands) : December 31 2017 2016 Goodwill Balance, beginning of year $ 77,084 $ 36,357 Goodwill attributable to acquisitions 7,480 40,727 Balance, end of year 84,564 77,084 Core deposit and other intangibles Balance, beginning of year 21,660 16,910 Core deposit and other intangibles attributable to acquisitions 1,100 4,750 Accumulated amortization (11,726 ) (8,911 ) Balance, end of year 11,034 12,749 Total goodwill and other intangibles $ 95,598 $ 89,833 The Company evaluates goodwill for impairment on at least an annual basis and more frequently if an event occurs or circumstances indicate carrying value exceeds fair value. At December 31, 2017 , the Company performed a qualitative assessment to determine if it was more likely than not that the fair value exceeded carrying value. The qualitative assessment indicated that it was more likely than not that the fair value exceeded its carrying value, resulting in no impairment. Amortization expense of $2.8 million , $2.1 million , and $1.8 million was recorded on total intangibles for the years ended December 31, 2017 , 2016 , and 2015 , respectively. Amortization expense for core deposit and other intangibles for the next five years is expected to be as follows (dollars in thousands) : Years Ended December 31 Core Deposit and Other Intangibles Amortization Expense 2018 $ 2,575 2019 2,492 2020 2,107 2021 1,778 2022 1,704 Thereafter 378 Total amortization expense $ 11,034

SBA Servicing Rights

SBA Servicing Rights	12 Months Ended
	Dec. 31, 2017
Transfers and Servicing [Abstract]
SBA Servicing Rights	NOTE 8: SBA SERVICING RIGHTS All sales of SBA loans, consisting of the guaranteed portion, are executed on a servicing retained basis. These loans, which are partially guaranteed by the SBA, are generally secured by business property such as real estate, inventory, equipment, and accounts receivable. During the years ended December 31, 2017 , 2016 and 2015 the Company sold SBA loans with unpaid principal balances totaling $50.3 million , $53.7 million and $42.1 million , respectively, and recognized $5.3 million , $5.4 million and $4.4 million , respectively, in gains on the loan sales. The Company retains the related loan servicing rights and receives servicing fees on the sold loans. Both the servicing fees and the gains on sales of loans are recorded in SBA income on the consolidated statements of income. SBA servicing fees totaled $1.7 million , $1.3 million and $978,000 for the years ended December 31, 2017 , 2016 and 2015 , respectively. At December 31, 2017 and 2016 , the Company serviced SBA loans for others with unpaid principal balances totaling $185.6 million and $142.1 million , respectively. The table below summarizes the activity in the SBA servicing rights asset for the period presented (dollars in thousands) : December 31 SBA Servicing Rights 2017 2016 2015 Balance, beginning of year $ 3,477 $ 2,626 $ 1,516 Additions 1,213 1,323 1,070 Fair value adjustments (621 ) (472 ) 40 Balance, end of year $ 4,069 $ 3,477 $ 2,626 A summary of the key characteristics, inputs and economic assumptions used to estimate the fair value of the Company's SBA servicing rights asset are as follows (dollars in thousands) : December 31 SBA Servicing Rights 2017 2016 Fair value $ 4,069 $ 3,477 Weighted average discount rate 12.9 % 12.8 % Decline in fair value due to a 100 basis point adverse change $ (140 ) $ (122 ) Decline in fair value due to a 200 basis point adverse change (272 ) (236 ) Prepayment speed 9.1 % 8.0 % Decline in fair value due to a 10% adverse change $ (141 ) $ (108 ) Decline in fair value due to a 20% adverse change (275 ) (210 ) Weighted average remaining life (years) 6.7 7.1 The risk inherent in the SBA servicing rights asset includes prepayments at different rates than anticipated or resolution of loans at dates not consistent with the estimated expected lives. These events would cause the value of the servicing asset to decline at a faster or slower rate than originally anticipated. Information about the SBA loans serviced by the Company at and for the periods presented is as follows (dollars in thousands) : December 31, 2017 SBA Loans Serviced Unpaid Principal Balance 30 - 89 Days Past Due 90 Days or Greater Past Due Net Charge-offs for the year ended December 31, 2017 Serviced for others $ 185,557 $ 1,555 $ — $ — Held-for-sale 10,420 — — — Held-for-investment 153,810 2,508 6,627 684 Total SBA loans serviced $ 349,787 $ 4,063 $ 6,627 $ 684 December 31, 2016 SBA Loans Serviced Unpaid Principal Balance 30 - 89 Days Past Due 90 Days or Greater Past Due Net Charge-offs for the year ended December 31, 2016 Serviced for others $ 142,069 $ 522 $ — $ — Held-for-sale 16,356 — — — Held-for-investment 144,351 220 5,580 1,986 Total SBA loans serviced $ 302,776 $ 742 $ 5,580 $ 1,986

FDIC Receivable for Loss Share

FDIC Receivable for Loss Share Agreements	12 Months Ended
	Dec. 31, 2017
FDIC Receivable for Loss Sharing Agreements [Abstract]
FDIC Receivable for Loss Share Agreements	NOTE 9: FDIC RECEIVABLE FOR LOSS SHARE AGREEMENTS On May 21, 2015, State Bank entered into an agreement with the FDIC to terminate loss share coverage on all 12 of its FDIC-assisted acquisitions which occurred in 2009, 2010, and 2011. The termination resulted in the elimination of both the FDIC receivable for loss share agreements and the associated clawback liability. The following table presents a summary of the calculation of the loss recognized as a result of the termination of the FDIC loss share agreements, including the clawback provisions and settlement of historic loss share and expense reimbursement claims (dollars in thousands) : For the Year Ended December 31, 2015 Cash paid to the FDIC to settle loss share agreements $ (3,100 ) FDIC loss share receivable (16,959 ) FDIC clawback payable 5,511 Loss on termination of FDIC loss share (14,548 ) Net amortization of FDIC receivable for loss share agreements during the period (1,940 ) Amortization of FDIC receivable for loss share agreements $ (16,488 ) The following table documents changes in the carrying value of the FDIC receivable for loss share agreements relating to purchased credit impaired loans and acquired other real estate owned previously covered under loss share agreements with the FDIC for the periods indicated (dollars in thousands) : For the Year Ended December 31 FDIC receivable for loss share agreements 2015 Balance, beginning of year $ 22,320 Provision for loan and lease losses attributable to FDIC for loss share agreements 1,045 Wires sent (received) 1,784 Net recoveries (6,627 ) Amortization (1,940 ) External expenses qualifying under loss share agreements 377 Termination of FDIC loss share (16,959 ) Balance, end of year $ —

Deposits

Deposits	12 Months Ended
	Dec. 31, 2017
Banking and Thrift [Abstract]
Deposits	NOTE 10: DEPOSITS Deposits are summarized as follows (dollars in thousands) : December 31 2017 2016 Noninterest-bearing demand deposits $ 1,191,106 $ 984,419 Interest-bearing transaction accounts 688,150 664,350 Savings and money market deposits 1,626,238 1,292,867 Time deposits less than $250,000 560,529 388,164 Time deposits $250,000 or greater 154,604 78,685 Brokered and wholesale time deposits 22,508 22,680 Total deposits $ 4,243,135 $ 3,431,165 Overdrawn deposit accounts reclassified as loans were $393,000 and $390,000 at December 31, 2017 and 2016 , respectively. The scheduled maturities of time, brokered, and wholesale deposits were as follows (dollars in thousands) : December 31, 2017 2018 $ 576,143 2019 96,001 2020 47,314 2021 10,776 2022 7,407 Total time, brokered, and wholesale deposits $ 737,641 The Company had $18.2 million in brokered deposits at December 31, 2017 , and had $14.3 million in brokered deposits at December 31, 2016 .

Securities Sold Under Repurchas

Securities Sold Under Repurchase Agreements	12 Months Ended
	Dec. 31, 2017
Securities Sold Under Repurchase Agreements [Abstract]
Securities Sold Under Repurchase Agreements	NOTE 11: SECURITIES SOLD UNDER REPURCHASE AGREEMENTS The Company utilizes securities sold under repurchase agreements to facilitate the needs of our customers. Securities sold under repurchase agreements consist of balances in the transaction accounts of commercial customers swept nightly to an overnight investment account and are collateralized with investment securities having a market value no less than the balance borrowed. The agreements bear interest rates determined by the Company. The investment securities pledged are subject to market fluctuations as well as prepayments of principal. The Company monitors the risk of the fair value of its pledged collateral falling below the balance of the repurchase agreements on a daily basis and may be required to provide additional collateral. Securities pledged as collateral are maintained with our safekeeping agent. At December 31, 2017 and 2016 , securities sold under repurchase agreements were $25.2 million and $25.7 million , respectively. These securities sold under repurchase agreements had a weighted average interest rate of .12% for both periods, all of which mature on an overnight and continuous basis. At December 31, 2017 and 2016 , investment securities pledged for the outstanding repurchase agreements consisted of U.S. government sponsored agency mortgage-backed securities. The Company assumed $2.0 million in federal funds purchased at December 31, 2016 through its acquisition of S Bankshares. These federal funds purchased carried a rate of 1.25% at December 31, 2016 and were paid off in January of 2017. At December 31, 2017 , the Company had no federal funds purchased.

Other Borrowings

Other Borrowings	12 Months Ended
	Dec. 31, 2017
Notes Payable [Abstract]
Other Borrowings	NOTE 12: OTHER BORROWINGS The Company has several participation agreements with various provisions regarding collateral position, pricing and other matters where the junior participation interests were sold. The terms of the agreements do not convey proportionate ownership rights with equal priority to each participating interest and entitle the Company to receive principal and interest payments before other participating interest holders. Given the participations sold do not qualify as participating interests, they do not qualify for sale treatment in accordance with generally accepted accounting principles. As a result, the Company recorded the transactions as secured borrowings. The balance of the secured borrowings was $398,000 at December 31, 2017 and 2016 , respectively. The loans are recorded at their gross balances outstanding and are included in organic loans on the consolidated statements of financial condition. The Company assumed $47.0 million in FHLB borrowings at December 31, 2016 through its acquisitions of NBG Bancorp and S Bankshares. These borrowings were paid off in January of 2017. At December 31, 2017 , the Company had no FHLB borrowings.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	NOTE 13: DERIVATIVES INSTRUMENTS & HEDGING ACTIVITIES Interest Rate Swaps and Caps Risk Management Objective of Interest Rate Swaps and Caps The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity and credit risk, primarily by managing the amount, sources and duration of certain balance sheet assets and liabilities. In the normal course of business, the Company also uses derivative financial instruments to add stability to interest income or expense and to manage its exposure to movements in interest rates. The Company does not use derivatives for trading or speculative purposes and only enters into transactions that have a qualifying hedging relationship. The Company's hedging strategies involving interest rate derivatives are classified as either Fair Value Hedges or Cash Flow Hedges, depending upon the rate characteristic of the hedged item. Fair Value Hedge: As a result of interest rate fluctuations, fixed-rate assets and liabilities will appreciate or depreciate in fair value. When effectively hedged, this appreciation or depreciation will generally be offset by fluctuations in the fair value of the derivative instruments that are linked to the hedged assets and liabilities. This strategy is referred to as a fair value hedge. Cash Flow Hedge: Cash flows related to floating-rate assets and liabilities will fluctuate with changes in an underlying rate index. When effectively hedged, the increases or decreases in cash flows related to the floating rate asset or liability will generally be offset by changes in cash flows of the derivative instrument designated as a hedge. This strategy is referred to as a cash flow hedge. Credit and Collateral Risks for Interest Rate Swaps and Caps The Company manages credit exposure on interest rate swap and cap transactions by entering in bilateral credit support agreement with each counterparty. The credit support agreements require collateralization of exposures beyond specified minimum threshold amounts. The details of these agreements, including the minimum thresholds, vary by counterparty. Refer to Note 14 , Balance Sheet Offsetting, for more information on collateral pledged and received under these agreements. The Company’s agreements with its interest rate swap and cap counterparties contain a provision where if either party defaults on any of its indebtedness, then it could also be declared in default on its derivative obligations. The agreements with derivative counterparties also include provisions that if not met, could result in the Company being declared in default. If the Company were to be declared in default, the counterparty could terminate the derivative positions and the Company and the counterparty would be required to settle their obligations under the agreements. At December 31, 2017 , the Company had no derivatives in a net liability position under these agreements. Mortgage Derivatives Risk Management Objective of Mortgage Lending Activities The Company also maintains a risk management program to manage interest rate risk and pricing risk associated with its mortgage lending activities. The risk management program includes the use of forward contracts and other derivatives that are recorded in the financial statements at fair value and are used to offset changes in value of the mortgage inventory due to changes in market interest rates. As a normal part of our operations, we enter into derivative contracts to economically hedge risks associated with overall price risk related to interest rate lock commitments ("IRLCs") and mortgage loans held-for-sale for which the fair value option has been elected. Fair value changes occur as a result of interest rate movements as well as changes in the value of the associated servicing. Derivative instruments used include forward sale commitments and IRLCs. Commitments to fund mortgage loans (interest rate locks) to be sold into the secondary market and forward commitments for the future delivery of mortgage loans to third party investors are considered derivatives. It is the Company's practice to enter into forward commitments for the future delivery of mortgage loans in order to economically hedge the effect of changes in interest rates resulting from interest rate lock commitments. Credit and Collateral Risks for Mortgage Lending Activities The Company’s underlying risks are primarily related to interest rates and forward sales commitments entered into as part of its mortgage banking activities. Forward sales commitments are contracts for the delayed delivery or net settlement of an underlying instrument, such as a mortgage loan, in which the seller agrees to deliver on a specified future date, either a specified instrument at a specified price or yield or the net cash equivalent of an underlying instrument. These hedges are used to preserve the Company’s position relative to future sales of mortgage loans to third parties in an effort to minimize the volatility of the expected gain on sale from changes in interest rate and the associated pricing changes. Derivative Fair Values The table below presents the fair values of the Company's derivatives at the dates indicated (dollars in thousands) : Asset Derivatives (1) Liability Derivatives (1) December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 Derivatives Designated as Hedging Instruments Interest rate swaps and caps $ 2,011 $ 1,774 $ 116 $ 641 Derivatives Not Designated as Hedging Instruments Interest rate swaps $ — $ 19 $ — $ 85 Mortgage derivatives 616 1,362 238 459 (1) All asset derivatives are located in "Other Assets" on the consolidated statements of financial condition and all liability derivatives are located in "Other Liabilities" on the consolidated statements of financial condition. Derivatives Designated as Hedging Instruments Fair Value Hedges The Company uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps, designated as fair value hedges, involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed payments over the life of the agreements without the exchange of the underlying notional amount. The gain or loss on the derivative as well as the offsetting gain or loss on the hedged item attributable to the hedged risk are recognized in earnings. At December 31, 2017 , the Company had 84 interest rate swaps with an aggregate notional amount of $141.9 million , designated as fair value hedges associated with the Company's fixed rate loan program. The table below presents the effect of the Company's derivatives in fair value hedging relationships for the periods presented (dollars in thousands) : December 31 Interest Rate Products Location 2017 2016 2015 Amount of gain (loss) recognized in income on derivatives Noninterest income $ 1,007 $ 1,863 $ (956 ) Amount of (loss) gain recognized in income on hedged items Noninterest income (1,057 ) (1,680 ) 815 Total net (loss) gain recognized in income on fair value hedge ineffectiveness $ (50 ) $ 183 $ (141 ) The Company recognized net (losses) gains of $(50,000) , $183,000 , and $(141,000) during the years ended December 31, 2017 , 2016 , and 2015 , respectively, related to hedge ineffectiveness on the fair value swaps. The Company also recognized a net reduction in interest income of $912,000 , $1.8 million , and $2.3 million for the years ended December 31, 2017 , 2016 , and 2015 , respectively, related to the fair value hedges, which includes net settlements on derivatives and any amortization adjustment of the basis in the hedged items. Terminations of derivatives and related hedged items for interest rate swap agreements prior to their original maturity date resulted in the recognition of net losses of $65,000 , $118,000 , and $492,000 in interest income for the years ended December 31, 2017 , 2016 , and 2015 , respectively, related to the unamortized basis in the hedged items. Cash Flow Hedges The Company uses interest rate caps as part of its interest rate risk management strategy. Interest rate caps, designated as cash flow hedges, involve the payment of a premium to a counterparty based on the notional size and cap strike rate. The Company's current cash flow hedges are for the purpose of capping the interest rates paid on deposits, which protects the Company in a rising rate environment. The caps were purchased during the first quarter of 2013 to hedge the variable cash outflows associated with these liabilities; they originally had a five -year life and notional value of $200.0 million . The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income (AOCI) and is subsequently reclassified into earnings in the period the hedged forecasted transaction affects earnings. The ineffective portion of the change in fair value of derivatives that qualify as cash flow hedges is recognized directly in earnings. No hedge ineffectiveness was recognized on the Company's cash flow hedges during the years ended December 31, 2017 , 2016 , or 2015 . Amounts reported in AOCI related to derivatives are reclassified to interest expense as the interest rate cap premium is amortized over the life of the cap. During the next twelve months, $88,000 is expected to be reclassified as a decrease to net interest income. The table below presents the effect of the Company's derivatives in cash flow hedging relationships for the periods presented (dollars in thousands) : December 31 Interest Rate Products Location 2017 2016 2015 Amount of gain (loss) recognized in income on derivatives (effective portion) OCI $ 58 $ (714 ) $ (2,294 ) Amount of loss reclassified from AOCI into income (effective portion) Interest expense 1,618 1,171 546 Total loss recognized in consolidated statements of comprehensive income $ (1,560 ) $ (1,885 ) $ (2,840 ) Derivatives Not Designated as Hedging Instruments Interest Rate Swaps At December 31, 2017 , the Company had no interest rate swaps that were not designated as fair value hedges associated with the Company's fixed rate loan program. The income statement effect from the derivatives not designated as hedging instruments was net losses of $124,000 , $51,000 , and $147,000 during the years ended December 31, 2017 , 2016 , and 2015 respectively. Mortgage Derivatives Mortgage derivative fair value assets and liabilities are recorded in "Other Assets" and "Other Liabilities", respectively, on the consolidated statements of financial condition. At December 31, 2017 , the fair value of mortgage derivative assets was $616,000 and the fair value of mortgage derivative liabilities was $238,000 . At December 31, 2016 , the fair value of mortgage derivative assets was $1.4 million and the fair value of mortgage derivative liabilities was $459,000 . At December 31, 2017 , the Company had approximately $36.3 million of interest rate lock commitments and $55.8 million of forward commitments for the future delivery of residential mortgage loans. The net gain (loss) related to interest rate lock commitments used for risk management was $78,000 , $(280,000) and $347,000 for the years ended December 31, 2017 , 2016 , and 2015 , respectively. The net (loss) gain for forward commitments related to these mortgage loans was $(603,000) , $819,000 , and $(34,000) for the years ended December 31, 2017 , 2016 , and 2015 , respectively. The table below presents the effect of the Company's derivatives not designated as hedging instruments for the periods presented (dollars in thousands) : December 31 Interest Rate Products Location 2017 2016 2015 Amount of gain (loss) recognized in income on interest rate lock commitments Noninterest income $ 78 $ (280 ) $ 347 Amount of (loss) gain recognized in income on forward commitments Noninterest income (603 ) 819 (34 ) Amount of loss recognized in income on interest rate swaps Noninterest income (124 ) (51 ) (147 ) Amount of (loss) gain recognized in income on derivatives not designated as hedging instruments $ (649 ) $ 488 $ 166

Balance Sheet Offsetting

Balance Sheet Offsetting	12 Months Ended
	Dec. 31, 2017
Offsetting [Abstract]
Balance Sheet Offsetting	NOTE 14: BALANCE SHEET OFFSETTING Certain financial instruments, including repurchase agreements and derivatives (interest rate swaps and caps), may be eligible for offset in the consolidated statements of financial condition and/or subject to master netting arrangements or similar agreements; however, the Company does not offset assets and liabilities under these arrangements for financial statement presentation purposes. The table below presents information about the Company’s financial instruments that are eligible for offset in the consolidated statements of financial condition at the dates presented (dollars in thousands) : Gross Amounts Recognized Gross Amounts Offset on the Statement of Financial Condition Net Amounts Presented on the Statement of Financial Condition Gross Amounts Not Offset on the Statement of Financial Condition Net Amount Financial Instruments Collateral Received/Posted (1) December 31, 2017 Offsetting Derivative Assets Interest rate swaps and caps $ 2,011 $ — $ 2,011 $ (116 ) $ (1,895 ) $ — Offsetting Derivative Liabilities Interest rate swaps and caps $ 116 $ — $ 116 $ (116 ) $ — $ — Repurchase agreements 25,209 — 25,209 — (25,209 ) — Total liabilities $ 25,325 $ — $ 25,325 $ (116 ) $ (25,209 ) $ — December 31, 2016 Offsetting Derivative Assets Interest rate swaps and caps $ 1,793 $ — $ 1,793 $ (718 ) $ (1,075 ) $ — Offsetting Derivative Liabilities Interest rate swaps and caps $ 726 $ — $ 726 $ (718 ) $ — $ 8 Repurchase agreements 25,722 — 25,722 — (25,722 ) — Total liabilities $ 26,448 $ — $ 26,448 $ (718 ) $ (25,722 ) $ 8 (1) The application of collateral cannot reduce the net amount below zero; therefore, excess collateral received/posted is not reflected in this table. All positions are fully collateralized.

Stock Warrants

Stock Warrants	12 Months Ended
	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Stock Warrants	NOTE 15: STOCK WARRANTS The Company has outstanding warrants purchased by current and former executive officers, directors and certain members of senior management. Warrant holders have the right to purchase one share of the Company's common stock at strike prices ranging from $5.00 to $11.21 per share through the ten -year contractual period. The warrants were fully exercisable as of the purchase date. During 2017 and 2016 , no new warrants were issued. The following table represents the activity related to stock warrants: December 31 2017 2016 Number of Warrants Weighted Average Exercise Price Number of Warrants Weighted Average Exercise Price Outstanding warrants at beginning of year 133,912 $ 9.37 172,745 $ 9.52 Exercised (51,008 ) 8.43 (38,833 ) 10.05 Outstanding warrants at end of year 82,904 $ 9.95 133,912 $ 9.37

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	NOTE 16: SHARE-BASED COMPENSATION The Company maintains an incentive compensation plan that includes share-based compensation. The State Bank Financial Corporation 2011 Omnibus Equity Compensation Plan (the "Plan") was approved by the Company's shareholders in 2011 and authorizes up to 3,160,000 shares of stock for issuance in accordance with the Plan terms. The Plan provides for the granting of Incentive Stock Options, Non-Qualified Stock Options, Performance Awards, Restricted Stock, Restricted Stock Units, Stock Appreciation Rights, Bonus Stock and Stock Awards, or any combination of the foregoing, as the Independent Directors Committee serving as the Compensation Committee determines is best suited to the circumstances of the particular individual. Stock Option Awards Option awards are granted with an exercise price equal to or greater than the market price of the Company's common stock at the date of grant. The options include a vesting period, usually three years, and a ten -year contractual period. Certain option grants provide for accelerated vesting if there is a change in control of the Company or certain other conditions are met, as defined in the Plan document. At all times during the term of the Plan, the Company shall retain the number of shares required to satisfy option exercises as authorized and unissued shares in the Company's treasury. Currently, the Company has a sufficient number of shares allocated to satisfy expected share option exercises. During the periods ended December 31, 2016 and 2015 there was no stock option activity. There was no compensation expense recognized related to stock options for the years ended December 31, 2017 , 2016 or 2015 , as all options were vested in 2013. The following table represents a summary of the activity related to stock options: December 31, 2017 Number of Options Weighted Average Exercise Price ($) Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value ($000) Outstanding options, beginning of year 28,918 $ 14.37 4.6 361 Exercised (28,918 ) 14.37 — 378 Outstanding options, end of year — $ — — $ — The aggregate intrinsic value of a stock option in the table above represents the total pre-tax intrinsic value (the amount by which the current market value of the underlying stock exceeds the exercise price of the option) that would have been received by the option holders had all option holders exercised their options on December 31, 2017 . This amount changes based on changes in the market value of the Company’s stock. The intrinsic value of options exercised during 2017 was $378,000 . Restricted Stock Awards The Company has issued both time-based and performance-based shares of restricted stock to certain officers and independent directors under the Plan. The Plan allows for the issuance of restricted stock awards that may not be sold or otherwise transferred until certain restrictions have lapsed. The holders of the restricted stock receive dividends, if applicable, and have the right to vote the shares. The fair value of the restricted stock awarded under the Plan is recorded as unearned share-based compensation. The unearned compensation related to time-based shares of restricted stock is amortized to compensation expense over the vesting period, generally five years. The total share-based compensation expense for these awards is determined based on the market price of the Company's common stock at the date of grant applied to the total number of shares granted and is amortized over the vesting period. The performance-based shares of restricted stock entitle the recipient to receive shares of the Company’s common stock upon the achievement of performance goals that are specified in the award agreement over a specified performance period. The unearned compensation related to performance-based shares of restricted stock is amortized to compensation expense over the vesting period, generally ten years. The total share-based compensation expense for these awards is determined based on the market price of the Company's common stock at the date of grant applied to the total number of shares granted and is amortized over the vesting period. During 2015, the Company issued 558,000 performance-based shares of restricted stock with a ten year performance period, of which 92,000 were subsequently forfeited. There were no performance shares granted during the years ended December 31, 2017 and 2016 . Compensation expense recognized in the Company's consolidated statements of income for restricted stock was $3.8 million , $3.9 million and $3.6 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. The total recognized tax benefit related to the share-based compensation was $2.5 million , $1.8 million and $1.4 million for 2017 , 2016 and 2015 , respectively. Total unrecognized compensation cost related to unvested share-based compensation was $10.5 million at December 31, 2017 and is expected to be recognized over a weighted-average period of 3.4 years. The following table represents a summary of the unvested restricted stock award activity: December 31, 2017 Shares Weighted Average Grant Date Fair Value Balance, beginning of year 1,006,052 $ 18.28 Granted 146,254 27.10 Forfeited (13,583 ) 19.95 Earned and issued (161,061 ) 16.89 Balance, end of year 977,662 $ 19.80 Restricted stock awards of 146,254 shares, 85,575 shares, and 664,706 shares, respectively, were granted during 2017 , 2016 and 2015 with a weighted-average grant date fair value of $27.10 , $19.81 and $19.33 , respectively.

Employee Benefit Plan

Employee Benefit Plan	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Employee Benefit Plan	NOTE 17: EMPLOYEE BENEFIT PLAN The Company offers a defined contribution 401(k) Profit Sharing Plan (the "401(k) Plan”) that covers substantially all employees meeting certain eligibility requirements. The 401(k) Plan allows employees to make pre-tax or Roth after-tax salary deferrals to the 401(k) Plan and the Company matches these employee contributions on a basis equal to a uniform percentage of the salary deferrals. During 2017 , 2016 and 2015 , the Company matched employee contributions dollar-for-dollar up to 5% of eligible compensation, subject to 401(k) Plan and regulatory limits. Participants receive matching contributions the first quarter after completing three months of service and matching contributions made after January 1, 2013 are fully vested, regardless of years of service. Compensation expense related to the 401(k) Plan totaled $2.6 million , $2.3 million , and $2.2 million in 2017 , 2016 and 2015 , respectively.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	NOTE 19: COMMITMENTS AND CONTINGENT LIABILITIES Commitments In order to meet the financing needs of its customers, the Company maintains financial instruments with off-balance-sheet risk in the normal course of business. These financial instruments include commitments to extend credit and standby letters of credit and involve, to varying degrees, elements of credit, interest rate and/or liquidity risk. Such financial instruments are recorded when they are funded and the related fees are generally recognized when collected. Commitments to extend credit are legally binding agreements to lend to customers. Commitments generally have fixed maturity dates or other termination clauses with required fee payments. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future liquidity requirements. The amount of collateral required, if deemed necessary upon extension of credit, is determined on a case by case basis by management through credit evaluation of the customer. Standby letters of credit are commitments guaranteeing performance of a customer to a third party. Those guarantees are issued primarily to support public and private borrowing arrangements. In order to minimize its exposure, the Company's credit policies govern the issuance of standby letters of credit. The Company's exposure to credit loss is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as for on-balance-sheet instruments. A summary of the Company's commitments is as follows (dollars in thousands) : December 31 2017 2016 Commitments to extend credit: Fixed $ 65,117 $ 63,166 Variable 914,524 608,176 Letters of credit: Fixed 5,978 6,985 Variable 11,428 3,239 Total commitments $ 997,047 $ 681,566 The fixed rate loan commitments have maturities ranging from one month to thirteen years . Management takes appropriate actions to mitigate interest rate risk associated with these fixed rate commitments through various measures including, but not limited to, the use of derivative financial instruments. Contingent Liabilities Mortgage loan sales agreements contain covenants that may, in limited circumstances, require the Company to repurchase or indemnify the investors for losses or costs related to the loans the Company has sold. As a result of the potential recourse provisions, the Company established a recourse liability for mortgage loans held-for-sale. The recourse liability was $297,000 and $306,000 at December 31, 2017 and 2016 , respectively. Furthermore, in the normal course of business, the Company is involved in various legal proceedings. In the opinion of management, any liability resulting from such proceedings would not have a material effect on the Company's financial statements.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2017
Banking and Thrift [Abstract]
Regulatory Matters	NOTE 18: REGULATORY MATTERS Regulatory Capital Requirements The Company and State Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory, and possibly additional discretionary, actions by regulators that, if undertaken, could have a direct material effect on the Company and State Bank. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and State Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Measures of regulatory capital are an important tool used by regulators to monitor the financial health of financial institutions. The primary quantitative measures used to gauge capital adequacy are the Common Equity Tier 1, Tier 1, Total Capital Ratios to risk-weighted assets (risk-based capital ratios) and the ratio of Tier 1 capital to average total assets (leverage ratio). Failure to meet various capital requirements can initiate regulatory action that could have a direct material effect on the Company and State Bank. Beginning on January 1, 2015, the Company and State Bank became subject to the provisions of the Basel III final rule that governs the regulatory capital calculation, including transitional, or phase-in, provisions. The methods for calculating the risk-based capital ratios will change as the provisions of the Basel III final rule related to the numerator (capital) and denominator (risk-weighted assets) are fully phased in on January 1, 2019. The ongoing methodological changes will result in differences in the reported capital ratios from one reporting period to the next that are independent of applicable changes in the capital base, asset composition, off-balance sheet exposures or risk profile. Beginning on January 1, 2016, the Company and State Bank must maintain a capital conservation buffer to avoid restrictions on capital distributions or discretionary bonus payments. This buffer must consist solely of Common Equity Tier 1 Capital, but the buffer applies to all three measurements (Common Equity Tier 1, Tier 1 capital and total capital) in addition to the minimum risk-based capital requirements. The capital conservation buffer required for 2017 is common equity equal to 1.25% of risk-weighted assets and will increase by .625% per year until reaching 2.5% beginning January 1, 2019. The minimum regulatory capital ratios and ratios to be considered well-capitalized under prompt corrective action provisions at the dates indicated are presented in the table below: December 31, 2017 December 31, 2016 Capital Ratio Requirements Minimum Requirement Well-capitalized (1) Minimum Requirement Well-capitalized (1) Common Equity Tier 1 Capital (CET1) 4.50% 6.50% 4.50% 6.50% Tier 1 Capital 6.00% 8.00% 6.00% 8.00% Total Capital 8.00% 10.00% 8.00% 10.00% Tier 1 Leverage 4.00% 5.00% 4.00% 5.00% (1) The prompt corrective action provisions are only applicable at the bank level. At December 31, 2017 and 2016 , the Company and State Bank exceeded all regulatory capital adequacy requirements to which they were subject. The Company's regulatory ratios at the dates indicated are presented in the table below (dollars in thousands) : December 31, 2017 December 31, 2016 Actual Required Actual Required Amount Ratio Minimum Amount Amount Ratio Minimum Amount Company CET1 Capital $ 547,822 12.61 % $ 195,433 $ 526,282 14.78 % $ 160,258 Tier 1 Capital 547,822 12.61 % 260,578 526,282 14.78 % 213,678 Total Capital 576,572 13.28 % 347,437 552,880 15.52 % 284,904 Tier 1 Leverage 547,822 11.24 % 194,924 526,282 14.90 % 141,273 State Bank's regulatory ratios at the dates indicated are presented in the table below (dollars in thousands) : December 31, 2017 December 31, 2016 Actual Required Actual Required Amount Ratio Minimum Amount Well Capitalized Amount Amount Ratio Minimum Amount Well Capitalized Amount State Bank CET1 Capital $ 481,135 11.10 % $ 194,972 $ 281,626 $ 463,164 13.06 % $ 159,535 $ 230,440 Tier 1 Capital 481,135 11.10 % 259,962 346,617 463,164 13.06 % 212,714 283,618 Total Capital 509,885 11.77 % 346,617 433,271 489,762 13.81 % 283,618 354,523 Tier 1 Leverage 481,135 9.90 % 194,429 243,037 463,164 13.18 % 140,572 175,715 Regulatory Restrictions on Dividends Regulatory policy statements provide that generally bank holding companies should pay dividends only out of current operating earnings and that the level of dividends must be consistent with current and expected capital requirements. Dividends received from State Bank have been the primary source of funds available for the declaration and payment of dividends to the Company's common shareholders. Federal and state banking laws and regulations restrict the amount of dividends State Bank may distribute without prior regulatory approval. At December 31, 2017 , State Bank had no capacity to pay dividends to the Company without prior regulatory approval. At December 31, 2017 , the Company had $55.1 million in cash and due from bank accounts, which can be used for additional capital as needed by the subsidiary bank, payment of holding company expenses, payment of dividends to shareholders or for other corporate purposes. Other Regulatory Matters The Company had required reserve balances at the Federal Reserve Bank of $29.6 million and $16.2 million at December 31, 2017 and 2016 , respectively.

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value	NOTE 20: FAIR VALUE Overview Fair value measurements are determined based on the assumptions that market participants would use in pricing an asset or liability. As a basis for considering market participant assumptions in fair value measurements, the Financial Accounting Standards Board's Accounting Standards Codification Topic 820 ("ASC 820") Fair Value Measurements and Disclosures establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within Levels 1 and 2 of the hierarchy) and the reporting entity's own assumptions about market participant assumptions developed based on the best information available in the circumstances (unobservable inputs classified within Level 3 of the hierarchy). Fair Value Hierarchy Level 1 Valuation is based on inputs that are quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. Level 2 Valuation is based on inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, such as interest rates, yield curves observable at commonly quoted intervals, and other market-corroborated inputs. Level 3 Valuation is generated from techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques include the use of option pricing models, discounted cash flow models and similar techniques. In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety. The Company's assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability. The Company evaluates fair value measurement inputs on an ongoing basis in order to determine if there is a change of sufficient significance to warrant a transfer between levels. Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally coincides with the Company's valuation process. For the years ended December 31, 2017 and 2016 , there were no transfers between levels. Fair Value Option ASC 820 allows companies to report selected financial assets and liabilities at fair value using the fair value option. The changes in fair value are recognized in earnings and the assets and liabilities measured under this methodology are required to be displayed separately on the balance sheet. The Company records mortgage loans held-for-sale at fair value under the fair value option, which allows for a more effective offset of the changes in fair values of the loans and the derivative instruments used to hedge them without the burden of complying with the requirements for hedge accounting. See Note 1 , Summary of Significant Accounting Policies. Financial Assets and Financial Liabilities Measured on a Recurring Basis The Company uses the following methods and assumptions in estimating the fair value of its financial assets and financial liabilities on a recurring basis: Investment Securities Available-for-Sale At December 31, 2017 , the Company's investment portfolio primarily consisted of U.S. government agency mortgage-backed securities, nonagency mortgage-backed securities, U.S. government securities, municipal securities, asset-backed securities, and corporate securities. Fair values for U.S. Treasury and equity securities are determined by obtaining quoted prices on nationally recognized securities exchanges utilizing Level 1 inputs. Other securities classified as available-for-sale are reported at fair value utilizing Level 2 inputs. The fair value of other securities classified as available-for-sale are determined using widely accepted valuation techniques including matrix pricing and broker-quote-based applications. Inputs may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond's terms and conditions, among other relevant items. The Company reviews the prices supplied by the independent pricing service, as well as their underlying pricing methodologies, for reasonableness and to ensure such prices are aligned with traditional pricing matrices. From time to time, the Company validates the appropriateness of the valuations provided by the independent pricing service to prices obtained from an additional third party or prices derived using internal models. Hedged Loans Loans involved in fair value hedges are recorded at fair value on a recurring basis. The estimated fair value is determined using Level 2 inputs consistent with the valuation methodology for interest rate swaps discussed below. The Company does not record other loans held for investment at fair value on a recurring basis. Mortgage Loans Held-for-Sale Mortgage loans held-for-sale are recorded at fair value on a recurring basis. The estimated fair value is determined using Level 2 inputs based on observable data such as the existing forward commitment terms or the current market value of similar loans. After origination and prior to sale, the mortgage loans held-for-sale accrue interest income, recorded in "interest income" on the consolidated statements of income, based on the contractual terms of the loans. Refer to Note 1 , Summary of Significant Accounting Policies, for more information on the accounting for mortgage loans held-for-sale. At December 31, 2017 and 2016 , the aggregate fair value of the mortgage loans held-for-sale was $25.8 million and $35.8 million , respectively. At December 31, 2017 and 2016 , the contractual balance including accrued interest was $25.2 million and $35.6 million , respectively, with a fair value mark totaling $544,000 and $209,000 , respectively. None of the loans were 90 days or more past due or on nonaccrual at December 31, 2017 or 2016 . The gain (loss) recognized for the change in fair value of the mortgage loans held-for-sale, included in "mortgage banking income" on the consolidated statements of income, was $334,000 , $(757,000) and $182,000 for the years ended December 31, 2017 , 2016 and 2015 , respectively. Derivative Financial Instruments Swaps and Caps The Company uses interest rate swaps to provide longer-term fixed rate funding to its customers and interest rate caps to mitigate the interest rate risk on its variable rate liabilities. The majority of these derivatives are traded within highly active dealer markets. In order to determine the fair value of these instruments, the Company utilizes the exchange price or dealer market price for the particular derivative contract. Therefore, these derivative contracts are classified as Level 2. The Company utilizes an independent third party valuation company to validate the dealer prices. In cases where significant credit valuation adjustments are incorporated into the estimation of fair value, reported amounts are considered to have been derived utilizing Level 3 inputs. The Company evaluates the credit risk of its counterparties as well as that of the Company. The Company has considered factors such as the likelihood of default by the Company and its counterparties, its net exposures, and remaining contractual life, among other things, in determining if any fair value adjustments related to credit risk are required. Counterparty exposure is evaluated by netting positions that are subject to master netting arrangements, as well as considering the amount of collateral securing the position. The Company reviews its counterparty exposure on a regular basis, and, when necessary, appropriate business actions are taken to adjust the exposure. The Company also utilizes this approach to estimate its own credit risk on derivative liability positions. To date, the Company has not realized any losses due to a counterparty's inability to pay any net uncollateralized position. Mortgage Derivatives Mortgage derivatives include interest rate lock commitments to originate residential mortgage loans held-for-sale. The Company relies on an internal valuation model to estimate the fair value of its interest rate lock commitments to originate residential mortgage loans held-for-sale. The model groups the interest rate lock commitments by interest rate and term, applies an estimated pull-through rate based on historical experience, and then multiplies by quoted investor prices which were determined to be reasonably applicable to the loan commitment group based on interest rate, term, and rate lock expiration date of the loan commitment group. While there are Level 2 and 3 inputs used in the valuation model, the Company has determined that the majority of the inputs significant in the valuation of the interest rate lock commitments fall within Level 3 of the fair value hierarchy. Changes in the fair values of these derivatives are included in "mortgage banking income" on the consolidated statements of income. Mortgage derivatives also include forward commitments to sell residential mortgage loans to various investors when interest rate locks are entered into, in order to hedge the change in interest rates resulting from its commitment to fund loans. The Company also relies on an internal valuation model to estimate the fair value of its forward commitments to sell residential mortgage loans (i.e., an estimate of what the Company would receive or pay to terminate the forward delivery contract based on market prices for similar financial instruments), which includes matching specific terms and maturities of the forward commitments against applicable investor pricing available (Level 2). Changes in the fair values of these derivatives are included in "mortgage banking income" on the consolidated statements of income. SBA Servicing Rights The Company has the rights to service a portfolio of SBA loans. The SBA servicing rights are measured at fair value when loans are sold on a servicing retained basis. The servicing rights are subsequently measured at fair value on a recurring basis utilizing Level 3 inputs. Management uses a model operated and maintained by a third party to calculate the present value of future cash flows using the third party's market-based assumptions. The future cash flows for each asset are based on the asset's unique characteristics and the third party's market-based assumptions for prepayment speeds, default and voluntary prepayments. For non-guaranteed portions of servicing assets, future cash flows are estimated using loan specific assumptions for losses and recoveries. Adjustments to fair value are recorded as a component of "SBA income" on the consolidated statements of income. The following tables present the financial assets and financial liabilities measured at fair value on a recurring basis at the dates indicated, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands) : December 31, 2017 Quoted Market Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: U.S. Government securities $ — $ 69,559 $ — $ 69,559 Residential mortgage-backed securities — nonagency — 118,710 — 118,710 Residential mortgage-backed securities — agency — 575,849 — 575,849 Corporate securities — 109,852 — 109,852 Hedged loans — 139,391 — 139,391 Mortgage loans held-for-sale — 25,791 — 25,791 Mortgage derivatives — 101 515 616 Interest rate swaps and caps — 2,011 — 2,011 SBA servicing rights — — 4,069 4,069 Total recurring assets at fair value $ — $ 1,041,264 $ 4,584 $ 1,045,848 Liabilities: Interest rate swaps and caps $ — $ 116 $ — $ 116 Mortgage derivatives — 38 200 238 Total recurring liabilities at fair value $ — $ 154 $ 200 $ 354 December 31, 2016 Quoted Market Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: U.S. Government securities $ — $ 88,649 $ — $ 88,649 States and political subdivisions — 301 — 301 Residential mortgage-backed securities — nonagency — 154,009 — 154,009 Residential mortgage-backed securities — agency — 529,302 — 529,302 Corporate securities — 74,917 — 74,917 Hedged loans — 167,165 — 167,165 Mortgage loans held-for-sale — 35,813 — 35,813 Mortgage derivatives — 663 699 1,362 Interest rate swaps and caps — 1,793 — 1,793 SBA servicing rights — — 3,477 3,477 Total recurring assets at fair value $ — $ 1,052,612 $ 4,176 $ 1,056,788 Liabilities: Interest rate swaps and caps $ — $ 726 $ — $ 726 Mortgage derivatives — 14 445 459 Total recurring liabilities at fair value $ — $ 740 $ 445 $ 1,185 The following tables present a reconciliation of all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (level 3) for the periods presented (dollars in thousands) : December 31 SBA Servicing Rights 2017 2016 2015 Balance, beginning of year $ 3,477 $ 2,626 $ 1,516 Additions 1,213 1,323 1,070 Fair value adjustments (1) (621 ) (472 ) 40 Balance, end of year $ 4,069 $ 3,477 $ 2,626 (1) Fair value adjustments are recorded as a component of "SBA income" on the consolidated statements of income. December 31 2017 2016 2015 Mortgage Derivatives Other Assets Other Liabilities Other Assets Other Liabilities Other Other Balance, beginning of year $ 699 $ 445 $ 651 $ 361 $ — $ — Acquired — — — — 272 135 Issuances (1) 2,058 1,367 2,529 2,041 1,934 1,500 Settlements and closed loans (1) (2,242 ) (1,612 ) (2,481 ) (1,957 ) (1,555 ) (1,274 ) Balance, end of year $ 515 $ 200 $ 699 $ 445 $ 651 $ 361 (1) Total gain (loss) on the change in fair value, recorded as a component of "mortgage banking income" on the consolidated statements of income was $61,000 , $(36,000) and $153,000 , respectively for the years ended December 31, 2017 , 2016 and 2015 . Financial Assets Measured on a Nonrecurring Basis The Company uses the following methods and assumptions in estimating the fair value of its financial assets on a nonrecurring basis: Impaired Loans Loans, excluding purchased credit impaired loans, are considered impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. The fair values of impaired loans are measured on a nonrecurring basis and are based on the underlying collateral value of each loan if repayment is expected solely from the collateral. Collateral values are estimated using Level 2 inputs that are based on observable market data such as an appraisal. Updated appraisals are obtained on at least an annual basis. Level 3 inputs are based on the Company's customized discounting criteria when management determines the fair value of the collateral is further impaired. The following table presents financial assets measured at fair value on a nonrecurring basis at the dates indicated, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands) : Quoted Market Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total December 31, 2017 Impaired loans $ — $ — $ 11,804 $ 11,804 Total nonrecurring assets at fair value $ — $ — $ 11,804 $ 11,804 December 31, 2016 Impaired loans $ — $ — $ 8,784 $ 8,784 Total nonrecurring assets at fair value $ — $ — $ 8,784 $ 8,784 Impaired loans, excluding purchased credit impaired loans, that are measured for impairment using the fair value of collateral for collateral dependent loans had recorded investments of $13.0 million and $9.6 million with respective valuation allowances of $1.2 million and $831,000 at December 31, 2017 and 2016 , respectively. Nonfinancial Assets Measured on a Nonrecurring Basis The Company uses the following methods and assumptions in estimating the fair values of its nonfinancial assets on a nonrecurring basis: Other Real Estate Owned Other real estate owned ("OREO") consists of real estate acquired through foreclosure or a deed in lieu of foreclosure in satisfaction of a loan, OREO acquired in a business acquisition, and banking premises no longer used for a specific business purpose. Real estate obtained in satisfaction of a loan is initially recorded at the lower of the principal investment in the loan or the fair value of the collateral less estimated costs to sell at the time of foreclosure with any excess in loan balance charged against the allowance for loan and lease losses. OREO acquired in a business acquisition is recorded at fair value on Day 1 of the acquisition. Banking premises no longer used for a specific business purpose is transferred into OREO at the lower of its carrying value or fair value less estimated costs to sell with any excess in the carrying value charged to noninterest expense. For all fair value estimates of the real estate properties, management considers a number of factors such as appraised values, estimated selling prices, and current market conditions, resulting in a Level 3 classification. Management periodically reviews the carrying value of OREO for impairment and adjusts the values as appropriate through noninterest expense. The following table presents nonfinancial assets measured at fair value on a nonrecurring basis at the dates indicated, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands) : Quoted Market Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total December 31, 2017 Other real estate owned $ — $ — $ 1,204 $ 1,204 December 31, 2016 Other real estate owned $ — $ — $ 13,292 $ 13,292 The following table is a reconciliation of the fair value measurement of other real estate owned disclosed in accordance with ASC Topic 820, Fair Value Measurements and Disclosures , to the amount recorded on the consolidated statements of financial condition (dollars in thousands) : December 31 Other Real Estate Owned 2017 2016 Other real estate owned at fair value $ 1,204 $ 13,292 Estimated selling costs and other adjustments (309 ) (2,395 ) Other real estate owned $ 895 $ 10,897 Unobservable Inputs for Level 3 Fair Value Measurements The following tables provide information describing the unobservable inputs used in Level 3 fair value measurements at the dates indicated (dollars in thousands) : December 31, 2017 Fair Value Valuation Technique Unobservable Inputs Range (Weighted Average) SBA servicing rights $ 4,069 Discounted cash flows Discount rate 10% - 22% (13%) Prepayment speed 4% - 13% (9%) Mortgage derivatives - asset $ 515 Pricing model Pull-through rate 84% Mortgage derivatives - liability $ 200 Pricing model Pull-through rate 84% Impaired loans - collateral dependent $ 11,804 Third party appraisal Management discount for property type and recent market volatility 0% - 50% (9%) Other real estate owned $ 1,204 Third party appraisal Management discount for property type and recent market volatility 0% - 33% (12%) December 31, 2016 Fair Value Valuation Technique Unobservable Inputs Range (Weighted Average) SBA servicing rights $ 3,477 Discounted cash flows Discount rate 9% - 18% (13%) Prepayment speed 3% - 11% (8%) Mortgage derivatives - asset $ 699 Pricing model Pull-through rate 84% Mortgage derivatives - liability $ 445 Pricing model Pull-through rate 84% Impaired loans - collateral dependent $ 8,784 Third party appraisal Management discount for property type and recent market volatility 0% - 50% (9%) Other real estate owned $ 13,292 Third party appraisal Management discount for property type and recent market volatility 0% - 68% (16%) Fair Value of Financial Assets and Financial Liabilities The following table includes the estimated fair value of the Company's financial assets and financial liabilities (dollars in thousands) . The methodologies for estimating the fair value of financial assets and financial liabilities measured on a recurring and nonrecurring basis are discussed above. The methodologies for estimating the fair value for other financial assets and financial liabilities are discussed below. The estimated fair value amounts have been determined by the Company using available market information and appropriate valuation methodologies; however, considerable judgment is required to interpret market data in order to develop the estimates of fair value. Accordingly, the estimates presented below are not necessarily indicative of the amounts the Company could realize in a current market exchange. The use of different market assumptions and/or estimation techniques may have a material effect on the estimated fair value amounts at December 31, 2017 and 2016 . December 31, 2017 December 31, 2016 Fair Value Hierarchy Level Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Assets: Cash and cash equivalents Level 1 $ 230,877 $ 230,877 $ 149,593 $ 149,593 Investment securities available-for-sale Level 2 873,970 873,970 847,178 847,178 Investment securities held-to-maturity Level 2 & 3 32,852 33,351 67,063 67,435 Loans held-for-sale Level 2 36,211 37,580 52,169 53,770 Loans, net Level 2 & 3 3,503,443 3,513,057 2,787,974 2,820,484 Other real estate owned Level 3 895 1,204 10,897 13,292 Interest rate swaps and caps Level 2 2,011 2,011 1,793 1,793 Mortgage derivatives Levels 2 & 3 616 616 1,362 1,362 SBA servicing rights Level 3 4,069 4,069 3,477 3,477 Accrued interest receivable Level 2 14,906 14,906 10,210 10,210 Federal Home Loan Bank stock Level 3 4,651 4,651 5,680 5,680 Liabilities: Deposits Level 2 $ 4,243,135 $ 4,237,883 $ 3,431,165 $ 3,430,405 Federal funds purchased and securities sold under agreements to repurchase Level 2 25,209 25,209 27,673 27,673 FHLB Borrowings Level 2 — — 47,014 47,014 Notes payable Level 2 398 398 398 398 Interest rate swaps and caps Level 2 116 116 726 726 Mortgage derivatives Levels 2 & 3 238 238 459 459 Accrued interest payable Level 2 3,750 3,750 2,312 2,312 Cash and Cash Equivalents The carrying amount approximates fair value because of the short maturity of these instruments. Investment Securities Held-to-Maturity Fair values are determined using quoted market prices or dealer quotes in the same manner as investment securities available-for-sale. Organic and Purchased Non-Credit Impaired Loans Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type. The fair value of performing loans is calculated by discounting scheduled cash flows through the estimated maturities using estimated market discount rates that reflect observable market information incorporating the credit, liquidity, yield, and other risks inherent in the loan. The estimate of maturity is based on the Company's historical experience with repayments for each loan classification, modified, as required, by an estimate of the effect of the current economic and lending conditions. Purchased Credit Impaired Loans Purchased credit impaired loans are recorded at fair value at the date of acquisition. The fair values of loans with evidence of credit deterioration are recorded net of a nonaccretable discount and an accretable discount. Subsequent decreases to the expected cash flows will generally result in a provision for loan and lease losses. Subsequent increases to the expected cash flows results in a reversal of the provision for loan and lease losses to the extent of prior changes or a reclassification of the difference from the nonaccretable to accretable discount with a positive impact on the accretable discount. Accrued Interest Receivable and Accrued Interest Payable The carrying amounts are a reasonable estimate of fair values. Federal Home Loan Bank Stock Federal Home Loan Bank stock, classified as a restricted equity security, is considered a Level 3 asset as little or no market activity exists for the security; therefore, the security's value is not market observable and is carried at original cost basis as cost approximates fair value. Deposits The fair value of deposits with no stated maturity, such as noninterest-bearing demand deposits, interest-bearing deposits, and savings and money market deposits, is equal to the amount payable on demand. The fair value of time deposits is estimated by discounting the expected life. The discount rate is estimated using the rates currently offered for deposits of similar remaining maturities. Federal Funds Purchased and Securities Sold Under Repurchase Agreements The fair value of federal funds purchased and securities sold under agreements to repurchase approximates the carrying amount because of the short maturity of these borrowings. FHLB Borrowings The carrying amount approximates fair value because of the short maturity of these instruments. Notes Payable Notes payable are variable rate subordinated debt for which performance is based on the underlying notes receivable interest rates adjust according to market value; therefore, the carrying amount approximates fair value.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 21: INCOME TAXES The components of income tax expense were as follows (dollars in thousands) : Years Ended December 31 2017 2016 2015 Current tax provision: Federal $ 27,484 $ 12,599 $ 35,151 State 2,926 540 5,126 Total current tax provision 30,410 13,139 40,277 Deferred tax provision: Federal 10,010 10,958 (20,831 ) State 622 2,087 (3,997 ) Total deferred tax provision 10,632 13,045 (24,828 ) Total income tax provision $ 41,042 $ 26,184 $ 15,449 Income tax expense differed from amounts computed by applying the Federal statutory rate of 35% to income before income taxes due to the following factors (dollars in thousands) : Years Ended December 31 2017 2016 2015 Federal taxes at statutory rate $ 30,666 $ 25,821 $ 15,355 Increase (reduction) in income taxes resulting from: State taxes, net of federal benefit 2,306 1,708 734 Tax-exempt interest (361 ) (355 ) (357 ) Bank-owned life insurance income (680 ) (675 ) (674 ) Tax rate change - Tax Cuts and Jobs Act of 2017 8,106 — — Merger election 2,545 — — Stock based compensation (904 ) (255 ) — Other (636 ) (60 ) 391 Income tax expense $ 41,042 $ 26,184 $ 15,449 On December 22, 2017, the Tax Cuts and Jobs Act was enacted. Among other things, the new law establishes a new, flat corporate federal statutory income tax rate of 21% effective January 1, 2018. At the enactment date, the Company revalued its deferred tax assets and liabilities based upon the newly enacted statutory rate of 21%, which is the rate at which these assets and liabilities are expected to reverse, and recognized provisional tax expense of $8.1 million . The ultimate impact of the Tax Cuts and Jobs Act may differ from this provisional amount due to changes in management's interpretations and assumptions, as well as additional regulatory guidance that may be issued. The provisional amount is expected to be finalized when the 2017 federal tax return is filed in 2018. The Company elected to treat its acquisition of AloStar as an acquisition of assets rather than an acquisition of stock for tax purposes. This election resulted in tax expense of $2.5 million to remeasure the deferred tax assets and liabilities related to the acquisition. The components of the net deferred tax asset included in other assets in the accompanying consolidated statement of financial condition are as follows (dollars in thousands) : December 31 2017 2016 Deferred tax assets Allowance for loan and lease losses $ 7,274 $ 10,288 Net operating losses and credit carryforward 4,125 6,649 Accrued compensation 4,046 5,585 Tax basis difference on acquired assets 2,864 6,407 Other real estate owned 128 497 Unrealized losses on cash flow hedges 22 682 Estimated loss on acquired failed bank assets 2,646 6,327 Unrealized losses on securities available-for-sale 843 834 Other 1,125 538 Total deferred tax assets 23,073 37,807 Deferred tax liabilities Intangible asset basis difference $ (4,427 ) $ (7,163 ) Premises and equipment (1,598 ) (2,406 ) Other (1,472 ) (989 ) Total deferred tax liabilities (7,497 ) (10,558 ) Net Deferred Tax Asset $ 15,576 $ 27,249 Based on management’s belief that it is more likely than not that all net deferred tax asset benefits will be realized, there was no valuation allowance at either December 31, 2017 or 2016 . At December 31, 2017 and 2016 , the Company had Federal and State tax net operating loss carryforwards, related to the Bank of Atlanta and S Bank acquisitions, of approximately $16.3 million and $17.2 million , respectively. The loss carryforwards can be deducted annually from future taxable income through 2036 , subject to an annual limitation of approximately $1.0 million . Currently, tax years 2014 to present are open for examination by Federal and State taxing authorities.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	NOTE 22: EARNINGS PER SHARE The Company has granted stock compensation awards with nonforfeitable dividend rights which are considered participating securities. As such, earnings per share is calculated using the two-class method. Basic earnings per share is calculated by dividing net income allocated to common shareholders by the weighted average number of common shares outstanding during the period which excludes the participating securities. Diluted earnings per share includes the dilutive effect of additional potential common shares from stock compensation awards and warrants. There were no anti-dilutive securities excluded from the computation of earnings per share in the periods presented. Earnings per share have been computed based on the following weighted average number of common shares outstanding (dollars in thousands, except per share data) : Years Ended December 31 2017 2016 2015 Numerator: Net income per consolidated statements of income $ 46,574 $ 47,591 $ 28,423 Net income allocated to participating securities (1,222 ) (1,303 ) (783 ) Net income allocated to common stock $ 45,352 $ 46,288 $ 27,640 Basic earnings per share computation: Net income allocated to common stock $ 45,352 $ 46,288 $ 27,640 Weighted average common shares outstanding, including shares considered participating securities 38,945,515 36,942,866 35,796,497 Less: Average participating securities (1,022,195 ) (1,011,338 ) (985,642 ) Weighted average shares 37,923,320 35,931,528 34,810,855 Basic earnings per share $ 1.20 $ 1.29 $ .79 Diluted earnings per share computation: Net income allocated to common stock $ 45,352 $ 46,288 $ 27,640 Weighted average common shares outstanding for basic earnings per share 37,923,320 35,931,528 34,810,855 Weighted average dilutive grants 71,337 102,115 1,231,864 Weighted average shares and dilutive potential common shares 37,994,657 36,033,643 36,042,719 Diluted earnings per share $ 1.19 $ 1.28 $ .77

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income	NOTE 23: ACCUMULATED OTHER COMPREHENSIVE INCOME Accumulated other comprehensive income, or AOCI, is reported as a component of shareholders' equity. AOCI can include, among other items, unrealized holding gains and losses on investment securities available-for-sale, unrealized gains and losses on investment securities available-for-sale transferred to held-to-maturity and gains and losses on derivative instruments that are designated as, and qualify as, cash flow hedges. The components of AOCI are reported net of related tax effects. The components of AOCI and changes in those components are as follows (dollars in thousands) : Investment Securities Available-for-Sale Held-to-Maturity Securities Transferred from Available-for-Sale Cash Flow Hedges (Effective Portion) Total Balance, December 31, 2014 $ 4,210 $ — $ (290 ) $ 3,920 Other comprehensive loss before income taxes: Net change in unrealized losses (6,955 ) — (2,294 ) (9,249 ) Amounts reclassified for net (gains) losses realized and included in earnings (354 ) — 546 192 Income tax benefit (2,827 ) — (676 ) (3,503 ) Balance, December 31, 2015 $ (272 ) $ — $ (1,362 ) $ (1,634 ) Other comprehensive loss before income taxes: Net change in unrealized losses (1,196 ) — (714 ) (1,910 ) Amounts reclassified for net (gains) losses realized and included in earnings (489 ) — 1,171 682 Transfer of net unrealized loss from available-for-sale to held-to-maturity 172 (172 ) — — Amortization of net unrealized losses on securities transferred to-held-to-maturity — (3 ) — (3 ) Income tax (benefit) expense (585 ) — 177 (408 ) Balance, December 31, 2016 $ (1,200 ) $ (175 ) $ (1,082 ) $ (2,457 ) Other comprehensive loss before income taxes: Net change in unrealized (losses) gains (2,874 ) — 58 (2,816 ) Amounts reclassified for net losses realized and included in earnings 1,453 — 1,618 3,071 Amortization of net unrealized losses on securities transferred to held-to-maturity — 196 — 196 Adoption of ASU 2018-02 (442 ) — (11 ) (453 ) Income tax (benefit) expense (540 ) — 648 108 Balance, December 31, 2017 $ (2,523 ) $ 21 $ (65 ) $ (2,567 ) Reclassifications from AOCI into income for the periods presented are as follows (dollars in thousands) : December 31 Reclassifications from AOCI into income and affected line items on Consolidated Statements of Income 2017 2016 2015 Investment securities available-for-sale (Loss) gain on sale of investment securities $ (1,453 ) $ 489 $ 354 Income tax benefit (expense) 558 (189 ) (137 ) Net income $ (895 ) $ 300 $ 217 Cash flow hedges (effective portion) Interest expense on deposits $ (1,618 ) $ (1,171 ) $ (546 ) Income tax benefit 621 453 211 Net income $ (997 ) $ (718 ) $ (335 )

Condensed Financial Information

Condensed Financial Information of State Bank Financial Corporation (Parent Company Only Financial Statements)	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Financial Information of State Bank Financial Corporation (Parent Company Only Financial Statements)	NOTE 24: CONDENSED FINANCIAL INFORMATION OF STATE BANK FINANCIAL CORPORATION (PARENT COMPANY ONLY FINANCIAL STATEMENTS) Condensed Statements of Financial Condition (Dollars in thousands) December 31 2017 2016 Assets Cash and due from banks $ 55,099 $ 79,129 Securities available-for-sale 1,515 1,546 Securities held-to-maturity 10,161 10,259 Investment in subsidiary 574,769 550,346 Other assets 939 8,082 Total assets $ 642,483 $ 649,362 Liabilities Other liabilities $ 932 $ 35,729 Total liabilities 932 35,729 Shareholders' equity 641,551 613,633 Total liabilities and shareholders' equity $ 642,483 $ 649,362 Condensed Statements of Income (Dollars in thousands) Years Ended December 31 2017 2016 2015 Interest income: Interest income $ 934 $ 940 $ 57 Net interest income 934 940 57 Noninterest income: Dividends from subsidiary 24,400 58,000 17,900 Other income 416 243 3,125 Total noninterest income 24,816 58,243 21,025 Noninterest expense: Salaries and employee benefits 1,425 2,246 7,537 Other noninterest expense 1,807 1,485 4,685 Total noninterest expense 3,232 3,731 12,222 Income before income tax and equity in undistributed net income of subsidiary 22,518 55,452 8,860 Income tax benefit (374 ) (1,306 ) (3,413 ) Income before equity in undistributed net income of subsidiary 22,892 56,758 12,273 Equity in earnings of subsidiary greater than (less than) dividends received 23,682 (9,167 ) 16,150 Net income $ 46,574 $ 47,591 $ 28,423 Condensed Statements of Cash Flows (Dollars in thousands) Years Ended December 31 2017 2016 2015 Cash flows from operating activities: Net income $ 46,574 $ 47,591 $ 28,423 Adjustments to reconcile net earnings to net cash provided by operating activities: Undistributed earnings of subsidiary (greater than) less than dividends received (23,682 ) 9,167 (16,150 ) Share-based compensation expense 3,791 3,889 3,595 Other, net 6,622 (2,771 ) (2,059 ) Net cash provided by operating activities 33,305 57,876 13,809 Cash flows from investing activities: Cash consideration paid, net of cash received for bank acquisitions (34,171 ) (3,685 ) (25,884 ) Purchase of investment securities available-for-sale — — (11,758 ) Other (39 ) — — Net cash used in investing activities (34,210 ) (3,685 ) (37,642 ) Cash flows from financing activities: Issuance of common stock 1 200 547 Repurchase of common stock — (5,128 ) — Restricted stock activity (1,312 ) (116 ) (27 ) Dividends paid (21,814 ) (20,681 ) (11,631 ) Net cash used in financing activities (23,125 ) (25,725 ) (11,111 ) Net (decrease) increase in cash and cash equivalents (24,030 ) 28,466 (34,944 ) Cash and cash equivalents, beginning 79,129 50,663 85,607 Cash and cash equivalents, ending $ 55,099 $ 79,129 $ 50,663

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	NOTE 25: SUBSEQUENT EVENTS (unaudited)

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2017
Real Estate [Abstract]
Other Real Estate Owned	December 31 Other real estate owned 2017 2016 Construction, land development, and other land $ 645 $ 2,393 Commercial and farmland real estate 153 6,960 Residential real estate 97 1,544 Total other real estate owned $ 895 $ 10,897 December 31 Other real estate owned 2017 2016 Organic OREO $ 153 $ 282 Purchased Credit Impaired OREO 742 10,615 Total other real estate owned $ 895 $ 10,897

Nature of Business and Summar35

Nature of Business and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation In preparing the consolidated 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 revenue and expenses for the period. Actual results could differ significantly from those estimates. Significant estimates include the allowance for loan and lease losses, the valuation of other real estate owned, the amount and timing of expected cash flows from purchased credit impaired loans, the fair value of investment securities and other financial instruments, and the valuation of goodwill. A substantial portion of the Company's loans are secured by real estate located in its market area. Accordingly, the ultimate collectability of a substantial portion of the Company's loan portfolio is susceptible to changes in the real estate market conditions. As defined by authoritative guidance, segment disclosures require reporting information about a company's operating segments using a “management approach.” Reportable segments are identified as those revenue-producing components for which separate financial information is produced internally and which are subject to evaluation by the chief operating decision maker in deciding how to allocate resources to segments. The Company operates as one reportable segment.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents, as presented in the consolidated financial statements, includes cash on hand, cash items in process of collection, federal funds sold, and interest-bearing deposits with other financial institutions with maturities less than 90 days.
Investments	Investments Management determines the appropriate classifications of investment securities at the time of purchase and reevaluates such designation as needed. At December 31, 2017 and 2016 , the Company classified all of its investment securities as either available-for-sale or held-to-maturity. Investment securities available-for-sale are reported at fair value, as determined by independent quotations. Investment securities held-to-maturity represent those securities management has the positive intent and ability to hold to maturity and are reported at amortized cost. Purchase premiums and discounts on investment securities are amortized and accreted to interest income using the effective interest rate method over the remaining lives of the securities, taking into consideration assumed prepayment patterns. Realized gains and losses are derived using the specific identification method for determining the cost of securities sold and are recognized on the trade date. The Company reclassified certain of its investment securities available-for-sale to held-to-maturity during the year ended December 31, 2016. The difference between book value and fair value at the date of transfer will continue to be reported in a separate component of accumulated other comprehensive income (loss), and will be amortized into income over the remaining life of the securities as an adjustment of yield. The difference between fair value at the date of transfer and par value is being amortized back to par value over the remaining life of the security as an adjustment to yield. Management evaluates securities for other-than-temporary impairment ("OTTI") on at least a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. In connection with the assessment for other-than-temporary impairment of investment securities, management obtains fair value estimates by independent quotations, assesses current credit ratings and related trends, reviews relevant delinquency and default information, assesses expected cash flows and coverage ratios, assesses the relative strength of credit support from less senior tranches of the securities, reviews average credit score data of underlying mortgages, and assesses other current data. The severity and duration of impairment and the likelihood of potential recovery of impairment is considered along with the intent and ability to hold any impaired security to maturity or recovery of carrying value. Unrealized losses, other than those determined to be other-than-temporary, and unrealized gains on available-for-sale are excluded from net income and are reported, net of tax, in other comprehensive income and in accumulated other comprehensive income (loss), a separate component of shareholders' equity. A decline in the market value of any security below cost that is deemed other-than-temporary results in a charge to earnings and the establishment of a new cost basis for that security. At December 31, 2017 and 2016 , the Company did not have any securities with other than temporary impairment. Investment in stock of the Federal Home Loan Bank ("FHLB") is required of every federally insured financial institution which utilizes the FHLB's services. The investment in FHLB stock is included in "other assets" at its original cost basis, as cost approximates fair value since there is no readily determinable market value for such investments given the redemptive provision of the FHLB. The Company acquired Federal Reserve Bank ("FRB") stock in its acquisition of NBG Bancorp, Inc. The investment in FRB stock is included in "other assets" at its original cost basis, as cost approximates fair value since there is no readily determinable market value for such investments.
Organic Loans	Organic Loans Organic loans, defined as loans not purchased in the acquisition of an institution or credit impaired portfolio, are loans management has the intent and ability to hold for the foreseeable future, until maturity, or until payoff. Organic loans are reported at their principal amounts outstanding, net of unearned income, deferred loan fees and origination costs, and unamortized premiums or discounts on purchased participation loans. Interest income is recognized using the simple interest method on the daily balance of the principal amount outstanding. Unearned income, primarily arising from deferred loan fees net of certain origination costs, is recognized as an adjustment of the related loan yield. Past due status is based on the contractual terms of the loan agreement. Generally, the accrual of interest income is discontinued and loans are placed on nonaccrual status when reasonable doubt exists as to the full, timely collection of interest or principal or when they reach 90 days past due. Interest previously accrued but not collected is reversed against current period interest income when such loans are placed on nonaccrual status. Interest on nonaccrual loans when ultimately collected is recorded as a principal reduction. Nonaccrual loans are returned to accrual status when all principal and interest amounts contractually due are brought current. In addition, the future payments must be reasonably assured along with a period of at least six months of repayment performance by the borrower depending on the contractual payment terms. When it has been determined that a loan cannot be collected in whole or in part, then the uncollectible portion is charged-off. The Company considers an organic loan impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. Additionally, loans for which the terms have been modified and for which (i) the borrower is experiencing financial difficulties and (ii) a concession has been granted to the borrower by the Company are considered troubled debt restructurings ("TDRs") and are included in impaired loans. The Company's policy requires that impaired loans be individually evaluated for impairment if either 1) contractual balances are $500,000 and greater or 2) less than $500,000 and 180 day past due or greater. Loans are reviewed for impairment based on the present value of expected future cash flows, discounted at the loan's effective interest rate, or the loan's observable market price, or the fair value of the collateral less disposal costs, as applicable, if the loan is collateral dependent. The Company's policy requires that large pools of smaller balance homogeneous loans, such as consumer, residential and installment loans, be collectively evaluated for impairment by the Company. Impairment losses are included in the allowance for loan and lease losses through a provision charge to earnings. All loans considered impaired are placed on nonaccrual status in accordance with policy. The interest portion of cash receipts on impaired loans are recorded as income when received unless full recovery of principal is in doubt whereby cash received is recorded as a reduction to the Company's recorded investment in the loan. All organic impaired loans are reviewed at least quarterly. Reviews may be performed more frequently if material information is available before the next scheduled quarterly review. Existing valuations are reviewed to determine if additional discounts or new appraisals are required. The discounts may include the following: length of time to market and sell the property, as well as expected maintenance costs, insurance and taxes and real estate commissions on sale.
Purchased Loans	Purchased Loans Purchased non-credit impaired loans ("PNCI loans") Loans acquired without evidence of deterioration in credit quality since origination, referred to as purchased non-credit impaired loans, are initially recorded at estimated fair value on the acquisition date. Premiums and discounts created when the loans are recorded at their estimated fair values at acquisition are amortized or accreted over the remaining term of the loan as an adjustment to the related loan's yield. The Company accounts for performing loans acquired in business combinations using the contractual cash flows method whereby premiums and discounts are recognized using the interest method. There is no allowance for loan and lease losses established at the acquisition date for purchased loans. Following the acquisition of these loans, the policies regarding nonaccrual and impaired loan status is consistent with that described above for organic loans. A provision for loan losses is recorded should there be deterioration in these loans subsequent to the acquisition. Purchased credit impaired loans ("PCI loans") Purchased credit impaired loans, defined as acquired loans, which at acquisition, management determined it was probable that the Company would be unable to collect all contractual principal and interest payments due, are recorded at fair value at the date of acquisition. The fair values of loans with evidence of credit deterioration are recorded net of a nonaccretable discount and, if appropriate, an accretable discount. The nonaccretable discount, which is excluded from the carrying amount of acquired loans, is the difference between the contractually required payments and the cash flows expected to be collected at acquisition. Any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable discount and is recognized in interest income over the remaining life of the loan when there is reasonable expectation about the amount and timing of such cash flows. The difference between actual prepayments and expected prepayments does not affect the nonaccretable discount. Subsequent decreases to the expected cash flows will result in a provision for loan losses. Subsequent increases in the amount of cash expected to be collected from the borrower results in the reversal of any previously-recorded provision for loan and lease losses and related allowance for loan and lease losses, and then as a prospective increase in the accretable discount on the purchased credit impaired loans. All loans acquired in failed bank transactions are considered to have evidence of credit deterioration, as limited due diligence is afforded which does not allow a sufficient detailed review to classify the acquired loans into credit deterioration and performing categories. At the time of acquisition, purchased credit impaired loans are either accounted for as specifically-reviewed or as part of a loan pool. Loan pools are created by grouping loans with similar risk characteristics, the intent being to create homogeneous pools. Loans are grouped into pools based on a combination of various factors including product type, cohort, risk classification and term. Loans remain in the assigned pool until the individual pools have resolved. Gains and losses on individual loans within pools are deferred and retained in the pools until the pool closes, which is either when all the loans are resolved or the pool’s aggregate recorded investment reaches zero.
Allowance for Loan and Lease Losses	Allowance for Loan and Lease Losses ("ALLL") The ALLL represents the amount considered adequate by management to absorb losses inherent in the loan portfolio at the balance sheet date. The ALLL is adjusted through provisions for loan losses charged or credited to operations. The provisions are generated through loss analyses performed on organic loans, estimated additional losses arising on PNCI loans subsequent to acquisition and impairment recognized as a result of decreased expected cash flows on PCI loans due to further credit deterioration since the previous quarterly cash flow re-estimation. The ALLL consists of both specific and general components. Individual loans are charged off against the ALLL when management determines them to be uncollectible. Subsequent recoveries, if any, of loans previously charged-off are credited to the ALLL. All known and inherent losses that are both probable and reasonable to estimate are recorded. While management utilizes available information to recognize losses on loans, future additions to the allowance may be necessary based on changes in economic conditions. In addition, various regulatory agencies, as an integral part of their examination process, periodically review the allowance. Such agencies may require adjustments to the ALLL based on their judgment about information available at the time of their examination. The Company assesses the adequacy of the ALLL quarterly with respect to organic and purchased loans. The assessment begins with a standard evaluation and analysis of the loan portfolio. All loans are consistently graded and monitored for changes in credit risk and possible deterioration in the borrower’s ability to repay the contractual amounts due under the loan agreements. Allowance for loan and lease losses for organic loans: The ALLL for organic loans consists of two components: (1) a specific amount against identified credit exposures where it is probable the Company will be unable to collect all amounts due according to the contractual terms of the loan agreements; and (2) a general amount based upon historical losses that are then adjusted for qualitative factors representative of various economic indicators and risk characteristics of the loan portfolio. Management establishes the specific amount by examining impaired loans. The majority of the Company's impaired loans are collateral dependent; therefore, nearly all of the specific allowances are calculated based on the fair value of the collateral less disposal costs, if applicable. Management establishes the general amount by reviewing the remaining loan portfolio (excluding those impaired loans discussed above) and incorporating allocations based on historical losses. The calculation of the general amount is subjected to qualitative factors that are somewhat subjective. The qualitative testing attempts to correlate the historical loss rates with current economic factors and current risks in the portfolio. The qualitative factors consist of but are not limited to: (1) economic factors including changes in the local or national economy; (2) the depth of experience in lending staff, credit administration and internal loan review; (3) asset quality trends; and (4) seasoning and growth rate of the portfolio segments. After assessing the applicable factors, the remaining amount is evaluated based on management's experience and the level of the organic ALLL is compared with historical trends and peer information as a reasonableness test. Allowance for loan and lease losses for purchased loans: Purchased loans are initially recorded at their acquisition date fair values. The carryover of allowance for loan and lease losses is prohibited as any credit losses in the loans are included in the determination of the fair value of the loans at the acquisition date. Fair values for purchased loans are based on a discounted cash flow methodology that involves assumptions and judgments as to credit risk, default rates, loss severity, collateral values, discount rates, payment speeds, prepayment risk and liquidity risk. The Company maintains an ALLL on purchased loans based on credit deterioration subsequent to the acquisition date. For purchased credit impaired loans accounted for under ASC 310-30, management establishes an allowance for credit deterioration subsequent to the date of acquisition by quarterly re-estimating expected cash flows with any decline in expected cash flows recorded as impairment in the provision for loan losses. Impairment is measured as the excess of the recorded investment in a loan over the present value of expected future cash flows discounted at the pre-impairment accounting yield of the loan. For any increases in cash flows expected to be collected, the Company first reverses only previously recorded ALLL, then adjusts the amount of accretable yield recognized on a prospective basis over the loan’s remaining life. For purchased loans that are not deemed impaired at acquisition, also referred to as purchased non-credit impaired loans, credit discounts representing the principal losses expected over the life of the loan are a component of the initial fair value and the discount is accreted to interest income over the life of the asset. Subsequent to the purchase date, the method used to evaluate the sufficiency of the credit discount is similar to originated loans, and if necessary, additional reserves are recognized in the allowance for loan and lease losses.
Loans Held-for-Sale	Loans Held-for-Sale Loans held-for-sale include the majority of originated residential mortgage loans and certain Small Business Administration ("SBA") loans, which the Company has the intent and ability to sell. Mortgage Loans Held-for-Sale The Company has elected to record mortgage loans held-for-sale at fair value under the fair value option. The fair value of committed residential mortgage loans held-for-sale is determined by outstanding commitments from investors and the fair value of uncommitted loans is based on current delivery prices in the secondary mortgage market. Net origination fees and costs are recognized in earnings at the time of origination for residential mortgage loans held-for-sale. Gains and losses on mortgage loan sales are recognized based on the difference between the net sales proceeds, including the estimated value associated with servicing assets or liabilities, and the net carrying value of the loans sold. Adjustments to reflect unrealized gains and losses resulting from changes in fair value of residential mortgage loans held-for-sale, as well as realized gains and losses at the sale of the residential mortgage loans, are classified on the consolidated statements of income as noninterest income - mortgage banking income. The loan sales agreements generally require that we repurchase or indemnify the investors for losses or costs on loans we sell under certain limited conditions. Some of these conditions include underwriting errors or omissions, fraud or material misstatements by the borrower in the loan application or invalid market value on the collateral property due to deficiencies in the appraisal. In addition to these conditions, our loan sale contracts define a condition in which the borrower defaults during a short period of time, typically 120 days to one year, as an Early Payment Default ("EPD"). In the event of an EPD, we are required to return the premium paid by the investor for the loan as well as certain administrative fees, and in certain situations repurchase the loan or indemnify the investor. Any losses related to loans previously sold are charged against our recourse liability for mortgage loans previously sold. The recourse liability is based on historical loss experience adjusted for current information and events when it is probable that a loss will be incurred. SBA Loans Held-for-Sale SBA loans held-for-sale are recorded at the lower of cost or market. Any loans subsequently transferred to the held for investment portfolio are transferred at the lower of cost or market at that time. For SBA loans, fair value is determined on an individual loan basis primarily based on loan performance and available market information. Origination fees and costs for SBA loans held-for-sale are capitalized as part of the basis of the loan and are included in the calculation of realized gains and losses upon sale. Gains and losses are classified on the consolidated statements of income as noninterest income - SBA income. All SBA loan sales are executed on a servicing retained basis - refer to SBA Servicing Rights below for more information .
Other Real Estate Owned (OREO)	Other Real Estate Owned ("OREO") Other real estate owned consists of real property (a) acquired through mergers and acquisitions, (b) acquired through foreclosure in satisfaction of loans receivable, and (c) banking premises formerly, but no longer, used for a specific business purpose. Other real estate is distinguished between organic, purchased non-credit impaired, or purchased credit impaired, consistent with the categories, respectively, at time of transfer. Real property acquired through mergers and acquisitions are recorded at fair value on Day 1 of the acquisition. Real estate acquired through foreclosure of loans, consisting of properties obtained through foreclosure proceedings or acceptance of a deed in lieu of foreclosure, is reported on an individual asset basis at the lower of cost or fair value, less costs to sell with any excess in loan balance charged against the allowance for loan and lease losses. Banking premises no longer used for a specific business purposes is transferred into OREO at the lower of its carrying value or fair value, less estimated costs to sell with any excess in carrying value charged to noninterest expense. For all fair value estimates of the real estate properties, fair value is determined on the basis of current appraisals, comparable sales, current market conditions, and other estimates of value obtained principally from independent sources. Management periodically reviews the carrying value of OREO for subsequent declines in fair value and adjusts the values as appropriate through noninterest expense. Gains or losses recognized on the disposition of the properties are recorded on the consolidated statements of income as "loan collection costs and OREO activity". Costs of improvements to real estate are capitalized, while costs associated with holding the real estate are charged to income. Prior to termination of the Company's loss share agreements with the FDIC in May 2015, OREO formerly covered under the agreements were reported exclusive of expected reimbursement cash flows from the FDIC. Subsequent adjustments to the estimated recoverable value of the other real estate resulted in a reduction of other real estate and a charge to other expense. The FDIC receivable was increased for the estimated amount to be reimbursed, with a corresponding offsetting amount recorded to other expense. Costs associated with holding the formerly covered other real estate were charged to noninterest expense, net of any expected reimbursements from the FDIC relating to previously covered external expenses.
Premises and Equipment	Premises and Equipment Premises and equipment are stated at cost, less accumulated depreciation, which is computed using the straight-line method over the estimated useful lives of the assets. The estimated useful lives of the assets range from 10 to 39 years for buildings and improvements and 3 to 15 years for furniture, fixtures, and equipment. Costs of improvements are capitalized and depreciated, while operating expenses are charged to current earnings.
Goodwill and Other Intangibles, Net	Goodwill and Other Intangibles, Net Goodwill represents the excess of the purchase price over the fair value of the net identifiable assets acquired in a business combination. Goodwill and other intangibles deemed to have an indefinite life are not amortized but instead are subject to review for impairment annually, or more frequently if deemed necessary. Also in connection with business combinations, the Company records core deposit intangibles, representing the value of the acquired core deposit base, and other identifiable intangible assets. Core deposit intangibles and other identifiable intangible assets are amortized on a straight-line basis over their estimated useful lives ranging up to 10 years.
SBA Servicing Rights	SBA Servicing Rights All sales of SBA loans, consisting of the guaranteed portion, are executed on a servicing retained basis. The standard sale structure under the SBA Secondary Participation Guaranty Agreement provides for the Company to retain a portion of the cash flow from the interest payment received on the loan. This cash flow is commonly known as a servicing spread. For any guaranteed loans sold at a premium, SBA regulations require the lender to keep a minimum 100 basis points in servicing spread which includes a minimum service fee of 40 basis points and a minimum premium protection fee of 60 basis points. The servicing spread is recognized as a servicing asset to the extent the spread exceeds adequate compensation for the servicing function. The fair value of the servicing asset is measured on a recurring basis at the present value of future cash flows using market-based discount assumptions. The future cash flows for each asset are based on their unique characteristics and market-based assumptions for prepayment speeds, default and voluntary prepayments. For non-guaranteed portions of servicing assets, future cash flows are estimated using loan specific assumptions for losses and recoveries. Adjustments to fair value are recorded as a component of "SBA income" on the consolidated statements of income. Servicing fee income is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income when earned.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities Interest Rate Swaps and Caps The Company enters into derivative financial instruments to manage interest rate risk, facilitate asset/liability management strategies and manage other exposures. These instruments may include interest rate swaps and interest rate caps and floors. All derivative financial instruments are recognized on the consolidated statements of financial condition as other assets or other liabilities, as applicable, at estimated fair value. The Company enters into master netting agreements with counterparties and/or requires collateral to cover exposures. In most cases, counterparties post at a zero threshold regardless of rating. Interest rate swaps are agreements to exchange interest payments based upon notional amounts. Interest rate swaps subject the Company to market risk associated with changes in interest rates, as well as the credit risk that the counterparty will fail to perform. Option contracts involve rights to buy or sell financial instruments on a specified date or over a period at a specified price. These rights do not have to be exercised. Some option contracts such as interest rate caps, involve the exchange of cash based on changes in specified indices. Interest rate caps are contracts to hedge interest rate increases based on a notional amount. Interest rate caps subject the Company to market risk associated with changes in interest rates, as well as the credit risk that the counterparty will fail to perform. Derivative financial instruments are designated, based on the exposure being hedged, as either fair value or cash flow hedges. Fair value hedge relationships mitigate exposure to the change in fair value of an asset, liability or firm commitment. Under the fair value hedging model, gains or losses attributable to the change in fair value of the derivative instrument, as well as the gains and losses attributable to the change in fair value of the hedged item, are recognized in other noninterest income in the period in which the change in fair value occurs. Hedge ineffectiveness is recognized as other noninterest income to the extent the changes in fair value of the derivative do not offset the changes in fair value of the hedged item. The corresponding adjustment to the hedged asset or liability is included in the basis of the hedged item, while the corresponding change in the fair value of the derivative instrument is recorded as an adjustment to other assets or other liabilities, as applicable. Cash flow hedge relationships mitigate exposure to the variability of future cash flows or other forecasted transactions. For cash flow hedge relationships, the effective portion of the gain or loss related to the derivative instrument is recognized as a component of accumulated other comprehensive income (loss). The ineffective portion of the gain or loss related to the derivative instrument, if any, is recognized in earnings as other noninterest income during the period of change. Amounts recorded in accumulated other comprehensive income (loss) are recognized in earnings in the period or periods during which the hedged item impacts earnings. The Company formally documents all hedging relationships between hedging instruments and the hedged items, as well as its risk management objective and strategy for entering into various hedge transactions. Methodologies related to hedge effectiveness and ineffectiveness are consistent between similar types of hedge transactions and typically include (i) statistical regression analysis of changes in the cash flows of the actual derivative and a perfectly effective hypothetical derivative, and (ii) statistical regression analysis of changes in the fair values of the actual derivative and the hedged item. The Company performs retrospective and prospective effectiveness testing using quantitative methods and does not assume perfect effectiveness through the matching of critical terms. Assessments of hedge effectiveness and measurements of hedge ineffectiveness are performed at least quarterly for ongoing effectiveness. Hedge accounting is discontinued prospectively when (i) a derivative is no longer highly effective in offsetting changes in the fair value or cash flows of a hedged item, (ii) a derivative expires or is sold, terminated or exercised, (iii) we elect to discontinue the designation of a derivative as a hedge, or (iv) in a cash flow hedge, a derivative is de-designated because it is not probable that a forecasted transaction will occur. If a derivative that qualifies as a fair value or cash flow hedge is terminated or the designation removed, the realized or then unrealized gain or loss is recognized in income over the life of the hedged item (fair value hedge) or in the period in which the hedged item affects earnings (cash flow hedge). Immediate recognition in earnings is required upon sale or extinguishment of the hedged item (fair value hedge) or if it is probable that the hedged cash flows will not occur (cash flow hedge). Derivatives continued to be held after hedge accounting ceases are carried at fair value on the consolidated statements of financial condition with changes in fair value including in earnings. Mortgage Derivatives The Company enters derivative financial instruments to manage interest rate risk and pricing risk associated with is mortgage banking activities. These instruments may include interest rate lock commitments and forward commitments. All mortgage derivatives are recognized on the consolidated statements of financial condition as other assets or other liabilities, as applicable, at estimated fair value and are not accounted for as hedges. Interest rate lock commitments are agreements to fund fixed-rate mortgage loans to customers. Forward commitments are agreements to sell fixed-rate mortgage loans to investors. Changes in fair value are recognized as a component of "mortgage banking income" on the consolidated statements of income.
Bank-Owned Life Insurance (BOLI)	Bank-Owned Life Insurance ("BOLI") The Company has purchased life insurance policies on certain key executives. Bank-owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value that is probable at settlement. Increases to cash surrender values are recorded as "Bank-owned life insurance income" on the consolidated statements of income. The Company has entered into a split dollar agreement with certain of its executives whereby the executive’s designated beneficiary will receive a portion of the death benefit upon the executive officer’s death. The Company uses the cost of insurance method whereby a liability is recorded relating to the benefit provided that extends to post-retirement periods.
Share-Based Compensation	Share-Based Compensation The Company has an equity compensation plan providing for the grant of equity awards, which is described more fully in Note 16 . The Company uses the fair value method of recognizing expense for share-based compensation, whereby compensation cost is measured at the grant date based on the value of the award and is recognized on a straight-line basis over the vesting period. Compensation expense relating to equity awards is reflected in net income as part of "salaries and employee benefits" on the consolidated statements of income.
Income Taxes	Income Taxes The Company recognizes deferred tax assets and liabilities for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. In assessing the realization of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies by jurisdiction and entity in making this assessment. Interest and penalties related to the Company’s tax positions are recognized as a component of the income tax provision.
Comprehensive Income	Comprehensive Income In addition to net income for the period, comprehensive income for the Company consists of changes in unrealized holding gains and losses on investments classified as available-for-sale, changes in unamortized or unaccreted premiums or discounts on investment securities available-for-sale transferred to held-to-maturity and changes in fair value of the effective portion of derivative financial instruments designated as cash flow hedges. The changes are reported net of income taxes and reclassification adjustments.
Acquisitions	Acquisitions Accounting principles generally accepted in the United States of America ("US GAAP") require that the acquisition method of accounting, formerly referred to as the purchase method, be used for all business combinations and that an acquirer be identified for each business combination. Under US GAAP, the acquirer is the entity that obtains control of one or more businesses in the business combination, and the acquisition date is the date the acquirer achieves control. US GAAP requires that the acquirer recognize the fair value of assets acquired, liabilities assumed, and any noncontrolling interest in the acquiree at the acquisition date.
Basic and Diluted Earnings Per Share	Basic and Diluted Earnings Per Share Basic earnings per share is calculated using the two-class method to determine income attributable to common shareholders. Unvested share-based payment awards that contain nonforfeitable rights to dividends are considered participating securities under the two-class method. Net income attributable to common shareholders is then divided by the weighted average common shares outstanding for the period. Diluted earnings per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the net income of the Company. Diluted earnings per share is computed by dividing net income attributable to common shareholders by the total of the weighted average number of shares outstanding plus the dilutive effect of the outstanding options and warrants.
Adoption of New Accounting Standards and Recent Accounting Pronouncements	Adoption of New Accounting Standards ASU 2018-02 — In February 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income . The amendments in this Update allow for a reclassification of stranded tax effects resulting from the Tax Cuts and Jobs Act from accumulated other comprehensive income to retained earnings. The amendments in this Update are effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted and the Company elected to early adopt this guidance effective December 31, 2017. The adoption resulted in a reclassification of stranded tax effects of $453,000 from accumulated other comprehensive income (loss) to retained earnings. ASU 2016-05 — In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016-05, Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships . The amendments in this Update clarify that a change in the counterparty to a derivative instrument that has been designated as a hedging instrument under Topic 815 does not, in and of itself, require dedesignation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The amendments in this update are effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted and the amendments can be adopted either on a prospective basis or a modified retrospective basis. The Company adopted the amendments in this ASU effective January 1, 2017. The adoption did not have a material impact on our consolidated financial statements. Recent Accounting Pronouncements ASU 2017-12 — On August 28, 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities . The purpose of this ASU is to better align a company’s risk management activities and financial reporting for hedging relationships with the economic objectives of those activities, simplify the hedge accounting requirements, and improve the disclosures of hedging arrangements. The ASU is effective for annual reporting periods, including interim periods within those annual reporting periods, beginning after December 15, 2018. Early adoption is permitted, including adoption in any interim period. ASU 2017-12 requires a modified retrospective transition method in which the Company will recognize the cumulative effect of the change on the opening balance of each affected component of equity in the statement of financial position as of the date of adoption. The Company is still reviewing the impact of adoption of this guidance. ASU 2017-09 — On May 10, 2017, the FASB issued ASU 2017-09, Scope of Modification Accounting. This Update amends the scope of modification accounting for share-based payment arrangements. It provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under ASC 718, Compensation—Stock Compensation. Specifically, an entity would not apply modification accounting if the fair value, vesting conditions and classification of the awards are the same immediately before and after the modification. The ASU is effective for annual reporting periods, including interim periods within those annual reporting periods, beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim period. The guidance is not expected to have a significant impact on the Company's financial position, results of operations or disclosures. ASU 2017-08 — In March 2017, FASB issued ASU No. 2017-08, Receivables - Nonrefundable Fees and Other Costs (Topic 310-20): Premium Amortization on Purchased Callable Debt Securities . The ASU shortens the amortization period for certain callable debt securities held at a premium. The premium on individual callable debt securities shall be amortized to the earliest call date. This guidance does not apply to securities for which prepayments are estimated on a large number of similar loans where prepayments are probable and reasonably estimable. The amendments in this update are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. This update should be adopted on a modified retrospective basis with a cumulative-effect adjustment to retained earnings on the date of adoption. The guidance is not expected to have a significant impact on the Company's financial position, results of operations or disclosures. ASU 2017-04 — In January 2017, FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment . The ASU simplifies the subsequent measurement of goodwill and eliminates Step 2 from the goodwill impairment test. The Company should perform its goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit's fair value. The impairment charge is limited to the amount of goodwill allocated to that reporting unit. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The guidance is not expected to have a significant impact on the Company's financial positions, results of operations or disclosures. ASU 2017-01 — In January 2017, FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business . The ASU clarifies the definition of a business to assist with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments in this update are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The guidance is not expected to have a significant impact on the Company's financial positions, results of operations or disclosures. ASU 2016-13 — In June 2016, FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU changed the credit loss model on financial instruments measured at amortized cost, available for sale securities and certain purchased financial instruments. Credit losses on financial instruments measured at amortized cost will be determined using a current expected credit loss model which requires the Company to measure all expected credit losses for financial instruments held at the reporting date based on historical experience, current conditions, and reasonable supportable forecasts. This replaces the existing incurred loss model and is applicable to the measurement of credit losses on financial assets measured at amortized cost and applies to some off-balance sheet credit exposures. Purchased financial assets with more-than-insignificant credit deterioration since origination ("PCD assets") measured at amortized cost will have an allowance for credit losses established at acquisition as part of the purchase price. Subsequent increases or decreases to the allowance for credit losses on PCD assets will be recognized in the income statement. Interest income should be recognized on PCD assets based on the effective interest rate, determined excluding the discount attributed to credit losses at acquisition. Credit losses relating to available-for-sale debt securities will be recognized through an allowance for credit losses. The amount of the credit loss is limited to the amount by which fair value is below amortized cost of the available-for-sale debt security. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted and if early adopted, all provisions must be adopted in the same period. The amendments should be applied through a cumulative-effect adjustment to retained earnings as of the beginning of the period adopted. A prospective approach is required for securities with other-than-temporary impairment recognized prior to adoption. The Company is still reviewing the impact of the adoption of this guidance and has established a cross-functional implementation team. The Company expects the allowance for credit losses to increase upon adoption with a corresponding adjustment to retained earnings. The ultimate amount of the increase will depend on the portfolio composition, credit quality, economic conditions and reasonable and supportable forecasts at that time. ASU 2016-02 — In February 2016, FASB issued ASU No. 2016-02, Leases (Topic 842). The new standard requires the recognition of assets and liabilities arising from the lease transactions on the balance sheet and the disclosure of key information about leasing arrangements. Accordingly, a lessee will recognize a lease asset for its right to use the underlying asset and a lease liability for the corresponding lease obligation. Both the asset and liability will initially be measured at the present value of the future minimum lease payments over the lease term. Subsequent measurement, including the presentation of expenses and cash flows, will depend on the classification of the lease as either a finance or an operating lease. Initial costs directly attributable to negotiating and arranging the lease will be included in the asset. For leases with a term of 12 months or less, a lessee can make an accounting policy election by class of underlying asset to not recognize an asset and corresponding liability. Lessees will also be required to provide additional qualitative and quantitative disclosures regarding the amount, timing and uncertainty of cash flows arising from leases. These disclosures are intended to supplement the amounts recorded in the financial statements and provide additional information about the nature of an organization’s leasing activities. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The modified retrospective approach includes a number of optional practical expedients that entities may elect to apply. An entity that elects to apply the practical expedients will, in effect, continue to account for leases that commence before the effective date in accordance with previous GAAP unless the lease is modified, except that lessees are required to recognize a right-of-use asset and a lease liability for all operating leases at each reporting date based on the present value of the remaining minimum rental payments that were tracked and disclosed under previous GAAP. The amendments in this update are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company expects to elect the package of practical expedients that allows it to not reassess whether any expired or existing contracts represent leases, the lease classification of any expired or existing lease and initial direct costs for any existing or expired leases. The Company expects this standard will have a material impact on its financial statements through gross-up of the balance sheet for lease assets and liabilities. However, no material change to lease expense recognition is expected. ASU 2016-01 — In January 2016, FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The amendments in this ASU (i) require equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (iii) eliminate the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, (iv) require public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (v) require an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments, (vi) require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements and (vii) clarify that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets. The accounting guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017. Early adoption is prohibited except for the presentation in other comprehensive income of the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk which may be early adopted. The guidance is not expected to have a significant impact on the Company's financial position, results of operations or disclosures. ASU 2014-09, Revenue from Contracts with Customers (Topic 606) , ASU 2015-14 Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date , ASU 2016-08 Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net) , ASU 2016-10 Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing , ASU 2016-11 Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting , ASU 2016-12 Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients , and ASU 2016-20 Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers — In May 2014, the FASB issued guidance to change the recognition of revenue from contracts with customers. The new guidance, which does not apply to financial instruments, provides that revenue should be recognized for the transfer of goods and services to customers in an amount equal to the consideration it receives or expects to receive. The guidance also includes expanded disclosure requirements that provides comprehensive information about the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. This guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. The Company currently plans to adopt the guidance using the modified retrospective method and without electing any of the practical expedients available. The Company has performed an analysis of the guidance and it is not expected to have a significant impact on the Company's financial position or results of operations but will increase disclosures of revenue.

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table summarizes the assets acquired and liabilities assumed and the consideration paid by the Company at the acquisition date (dollars in thousands) : As Recorded by NBG Bancorp, Inc. Fair Value Adjustments As Recorded by the Company Assets Cash and cash equivalents $ 38,146 $ (31,158 ) (a) $ 6,988 Investment securities available-for-sale 5,974 (40 ) (b) 5,934 Loans, net 348,641 (3,645 ) (c) 344,996 Loans held-for-sale 694 — 694 Other real estate owned 69 (5 ) (d) 64 Core deposit intangible — 3,740 (e) 3,740 Premises and equipment, net 7,943 (635 ) (f) 7,308 Bank-owned life insurance 1,499 — 1,499 Other assets 6,542 276 (g) 6,818 Total assets acquired $ 409,508 $ (31,467 ) $ 378,041 Liabilities Deposits: Noninterest-bearing $ 58,161 $ — $ 58,161 Interest-bearing 261,034 (30,711 ) (h) 230,323 Total deposits 319,195 (30,711 ) 288,484 FHLB advances 46,354 (140 ) (i) 46,214 Other liabilities 2,067 — 2,067 Total liabilities assumed 367,616 (30,851 ) 336,765 Net identifiable assets acquired over liabilities assumed $ 41,892 $ (616 ) $ 41,276 Goodwill $ — $ 36,587 $ 36,587 Net assets acquired over liabilities assumed $ 41,892 $ 35,971 $ 77,863 Consideration: State Bank Financial Corporation common shares issued 1,626,648 Purchase price per share of the Company's common stock $ 26.86 Company common stock issued 43,692 Cash exchanged for shares 34,171 Fair value of total consideration transferred $ 77,863 Explanation of fair value adjustments (a) Adjustment reflects the elimination of a deposit account The National Bank of Georgia held with State Bank. (b) Adjustment reflects the loss on certain securities that were sold immediately following close that was deemed to be a more accurate representation of fair value. (c) Adjustment reflects the fair value adjustment based on State Bank's evaluation of the acquired loan portfolio and includes the adjustment to eliminate the recorded allowance for loan and lease losses. (d) Adjustment reflects the fair value adjustment based on State Bank's evaluation of the acquired other real estate owned portfolio. (e) Adjustment reflects the fair value adjustment to record the estimated core deposit intangible. (f) Adjustment reflects the fair value adjustment based on appraised values. (g) Adjustment reflects the fair value adjustment based on State Bank's evaluation of acquired other assets. (h) Adjustment reflects the elimination of a deposit account The National Bank of Georgia held with State Bank and the fair value adjustment based on State Bank's evaluation of acquired deposits. (i) Adjustment arises since the rates on acquired FHLB advances were lower than the rates available on similar borrowings. Subsequent to the NBG Bancorp acquisition all FHLB advances were paid off. The following table summarizes the assets acquired and liabilities assumed and the consideration paid by the Company at the acquisition date (dollars in thousands) : As Recorded by S Bankshares Inc. Fair Value Adjustments As Recorded by the Company Assets Cash and cash equivalents $ 954 $ — $ 954 Investment securities available-for-sale 13,814 (88 ) (a) 13,726 Loans, net 81,383 (2,344 ) (b) 79,039 Other real estate owned 1,278 (332 ) (c) 946 Core deposit intangible — 1,010 (d) 1,010 Premises and equipment, net 3,132 420 (e) 3,552 Bank-owned life insurance 3,124 — 3,124 Other assets 2,636 1,130 (f) 3,766 Total assets acquired $ 106,321 $ (204 ) $ 106,117 Liabilities Deposits: Noninterest-bearing $ 16,620 $ — $ 16,620 Interest-bearing 76,664 494 (g) 77,158 Total deposits 93,284 494 93,778 Federal funds purchased and securities sold under repurchase agreements 1,951 — 1,951 FHLB advances 800 — 800 Other liabilities 1,104 — 1,104 Total liabilities assumed 97,139 494 97,633 Net identifiable assets acquired over liabilities assumed $ 9,182 $ (698 ) $ 8,484 Goodwill $ — $ 4,140 $ 4,140 Net assets acquired over liabilities assumed $ 9,182 $ 3,442 $ 12,624 Consideration: State Bank Financial Corporation common shares issued 310,596 Purchase price per share of the Company's common stock $ 26.86 Company common stock issued 8,343 Cash exchanged for shares 4,281 Fair value of total consideration transferred $ 12,624 Explanation of fair value adjustments (a) Adjustment reflects the loss on certain securities that were sold immediately following close that was deemed to be a more accurate representation of fair value. (b) Adjustment reflects the fair value adjustment based on State Bank's evaluation of the acquired loan portfolio and includes the adjustment to eliminate the recorded allowance for loan and lease losses. (c) Adjustment reflects the fair value adjustment based on State Bank's evaluation of the acquired other real estate owned portfolio. (d) Adjustment reflects the fair value adjustment to record the estimated core deposit intangible. (e) Adjustment reflects the fair value adjustment based on appraised values. (f) Adjustment reflects the fair value adjustment based on State Bank's evaluation of acquired other assets. (g) Adjustment reflects the fair value adjustment based on State Bank's evaluation of acquired deposits. The following table summarizes the assets acquired and liabilities assumed and the consideration payable by the Company at the acquisition date (dollars in thousands) : As Recorded by AloStar Bank of Commerce Fair Value Adjustments As Recorded by the Company Assets Cash and cash equivalents $ 91,571 $ — $ 91,571 Investment securities available-for-sale 76,436 (195 ) (a) 76,241 Loans, net 728,319 (9,763 ) (b) 718,556 Core deposit intangible — 856 (c) 856 Premises and equipment, net 507 — 507 Other assets 11,430 2,233 (d) 13,663 Total assets acquired $ 908,263 $ (6,869 ) $ 901,394 Liabilities Deposits: Noninterest-bearing $ 102,653 $ — $ 102,653 Interest-bearing 603,069 (121 ) (e) 602,948 Total deposits 705,722 (121 ) 705,601 Other liabilities 7,912 — 7,912 Total liabilities assumed 713,634 (121 ) 713,513 Net identifiable assets acquired over liabilities assumed $ 194,629 $ (6,748 ) $ 187,881 Goodwill $ — $ 7,088 $ 7,088 Net assets acquired over liabilities assumed $ 194,629 $ 340 $ 194,969 Consideration: Cash consideration 194,969 Fair value of total consideration transferred $ 194,969 Explanation of fair value adjustments (a) Adjustment reflects the loss on certain securities that were sold immediately following the closing that was deemed to be a more accurate representation of fair value. (b) Adjustment reflects the fair value adjustment based on the State Bank's evaluation of the acquired loan portfolio and includes the adjustment to eliminate the recorded allowance for loan and lease losses. (c) Adjustment reflects the fair value adjustment to record the estimated core deposit intangible. (d) Adjustment reflects the fair value adjustment based on State Bank's evaluation of acquired other assets. (e) Adjustment reflects the fair value adjustment based on State Bank's evaluation of acquired deposits. The following table summarizes the assets acquired and liabilities assumed and the consideration paid by the Company at the acquisition date (dollars in thousands) : As Recorded by Georgia-Carolina Bancshares, Inc. Fair Value Adjustments As Recorded by the Company Assets Cash and due from banks $ 20,873 $ — $ 20,873 Investment securities 130,218 999 (a) 131,217 Loans, net 293,814 590 (b) 294,404 Loans held-for-sale 34,956 — 34,956 Other real estate owned 4,428 2,042 (c) 6,470 Core deposit intangible — 6,710 (d) 6,710 Premises and equipment, net 9,175 2,803 (e) 11,978 Bank-owned life insurance 15,414 — 15,414 Other assets 9,122 (4,457 ) (f) 4,665 Total assets acquired $ 518,000 $ 8,687 $ 526,687 Liabilities Deposits: Noninterest-bearing $ 80,888 $ — $ 80,888 Interest-bearing 335,889 878 (g) 336,767 Total deposits 416,777 878 417,655 Securities sold under repurchase agreements 27,588 — 27,588 Other liabilities 11,823 652 (h) 12,475 Total liabilities assumed 456,188 1,530 457,718 Net identifiable assets acquired over liabilities assumed $ 61,812 $ 7,157 $ 68,969 Goodwill $ — $ 19,904 $ 19,904 Net assets acquired over liabilities assumed $ 61,812 $ 27,061 $ 88,873 Consideration: State Bank Financial Corporation common shares issued 2,854,970 Purchase price per share of the Company's common stock $ 19.98 Company common stock issued 57,042 Cash exchanged for shares 31,831 Fair value of total consideration transferred $ 88,873 Explanation of fair value adjustments (a) Adjustment reflects the gain on certain securities that were sold immediately following close that was deemed to be a more accurate representation of fair value. (b) Adjustment reflects the fair value adjustment based on State Bank's evaluation of the acquired loan portfolio and includes the adjustment to eliminate the recorded allowance for loan and lease losses. (c) Adjustment reflects the fair value adjustment based on State Bank's evaluation of the acquired other real estate owned portfolio. (d) Adjustment reflects the fair value adjustment to record the estimated core deposit intangible. (e) Adjustment reflects the fair value adjustment based on appraised values. (f) Adjustment reflects the fair value adjustment based on State Bank's evaluation of acquired other assets. (g) Adjustment reflects the fair value adjustment based on State Bank's evaluation of acquired deposits. (h) Adjustment reflects the fair value adjustment based on State Bank's evaluation of other liabilities and to record certain liabilities directly attributable to the acquisition.
Business Acquisition, Pro Forma Information	The following table presents certain pro forma information as if AloStar had been acquired on January 1, 2015 (dollars in thousands, except per share amounts) . These results combine the historical results of AloStar in the Company's consolidated statements of income and, while certain adjustments were made for the estimated impact of certain fair value adjustments and other acquisition-related activity, they are not indicative of what would have occurred had the acquisition taken place on January 1, 2015. Merger-related costs are not included in the pro forma statements below. Twelve Months Ended December 31 2017 2016 2015 Pro Forma Pro Forma Pro Forma Net interest income $ 227,257 $ 192,035 $ 190,497 Net income 58,259 57,029 38,003 Earnings per share: Basic $ 1.50 $ 1.54 $ 1.06 Diluted 1.49 1.54 1.03 The following table discloses the impact of the merger with NBG Bancorp, Inc. (excluding the impact of merger-related expenses) from the acquisition date of December 31, 2016 (dollars in thousands, except per share amounts) . The table also presents certain pro forma information as if NBG Bancorp, Inc. had been acquired on January 1, 2015 . These results combine the historical results of NBG Bancorp, Inc. in the Company's consolidated statements of income and, while certain adjustments were made for the estimated impact of certain fair value adjustments and other acquisition-related activity, they are not indicative of what would have occurred had the acquisition taken place on January 1, 2015 . Merger-related costs are not included in the pro forma statements below. Twelve Months Ended December 31 2017 2016 2015 Pro Forma Pro Forma Pro Forma Net interest income $ 192,786 $ 173,583 $ 170,520 Net income 47,412 49,639 33,152 Earnings per share: Basic $ 1.22 $ 1.29 $ .88 Diluted 1.22 1.28 .86 The following table discloses the impact of the merger with S Bankshares Inc. (excluding the impact of merger-related expenses) from the acquisition date of December 31, 2016 (dollars in thousands, except per share amounts) . The table also presents certain pro forma information as if S Bankshares Inc. had been acquired on January 1, 2015 . These results combine the historical results of S Bankshares Inc. in the Company's consolidated statements of income and, while certain adjustments were made for the estimated impact of certain fair value adjustments and other acquisition-related activity, they are not indicative of what would have occurred had the acquisition taken place on January 1, 2015 . Merger-related costs are not included in the pro forma statements below. Twelve Months Ended December 31 2017 2016 2015 Pro Forma Pro Forma Pro Forma Net interest income $ 192,786 $ 161,450 $ 156,427 Net income 47,031 49,325 29,179 Earnings per share: Basic $ 1.21 $ 1.32 $ .81 Diluted 1.21 1.32 .78 Merger-related costs of $1.7 million are included in the Company's consolidated statements of income for the year ended December 31, 2015 and are not included in the pro forma statements below. Twelve Months Ended December 31 2015 Pro Forma Net interest income $ 150,677 Net income 30,153 Earnings per share: Basic $ .78 Diluted .75
Business Acquisition, Purchased Credit Impaired Loans Acquired	The following is a summary of the purchased credit impaired loans acquired in the NBG Bancorp, Inc. transaction on December 31, 2016 (dollars in thousands) : Purchased Credit Impaired Loans Contractually required principal and interest at acquisition $ 33,584 Contractual cash flows not expected to be collected (nonaccretable difference) (3,736 ) Expected cash flows at acquisition 29,848 Accretable difference (2,799 ) Basis in acquired loans at acquisition - estimated fair value $ 27,049 The following is a summary of the purchased credit impaired loans acquired in the S Bankshares Inc. transaction on December 31, 2016 (dollars in thousands) : Purchased Credit Impaired Loans Contractually required principal and interest at acquisition $ 15,966 Contractual cash flows not expected to be collected (nonaccretable difference) (2,805 ) Expected cash flows at acquisition 13,161 Accretable difference (1,377 ) Basis in acquired loans at acquisition - estimated fair value $ 11,784 The following is a summary of the purchased credit impaired loans acquired in the Georgia-Carolina Bancshares, Inc. transaction on January 1, 2015 (dollars in thousands) : Purchased Credit Impaired Loans Contractually required principal and interest at acquisition $ 3,060 Contractual cash flows not expected to be collected (nonaccretable difference) (783 ) Expected cash flows at acquisition 2,277 Accretable difference (317 ) Basis in acquired loans at acquisition - estimated fair value $ 1,960 The following is a summary of the purchased credit impaired loans acquired in the AloStar transaction on September 30, 2017 (dollars in thousands) : Purchased Credit Impaired Loans Contractually required principal and interest at acquisition $ 108,308 Contractual cash flows not expected to be collected (nonaccretable difference) (19,093 ) Expected cash flows at acquisition 89,215 Accretable difference (11,664 ) Basis in acquired loans at acquisition - estimated fair value $ 77,551

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investment Securities Available-for-Sale	The amortized cost and fair value of securities classified as available-for-sale are as follows (dollars in thousands) : December 31, 2017 December 31, 2016 Investment Securities Available-for-Sale Amortized Cost Unrealized Gains Unrealized Losses Fair Value Amortized Cost Unrealized Gains Unrealized Losses Fair Value U.S. Government securities $ 70,203 $ — $ 644 $ 69,559 $ 89,044 $ 70 $ 465 $ 88,649 States and political subdivisions — — — — 300 1 — 301 Residential mortgage-backed securities — nonagency 115,639 3,183 112 118,710 151,519 3,129 639 154,009 Residential mortgage-backed securities — agency 582,845 319 7,315 575,849 533,479 548 4,725 529,302 Corporate securities 108,661 1,299 108 109,852 74,793 207 83 74,917 Total investment securities available-for-sale $ 877,348 $ 4,801 $ 8,179 $ 873,970 $ 849,135 $ 3,955 $ 5,912 $ 847,178
Held-to-maturity Securities	December 31, 2017 December 31, 2016 Investment Securities Held-to-Maturity Amortized Cost Unrealized Gains Unrealized Losses Fair Value Amortized Cost Unrealized Gains Unrealized Losses Fair Value Asset-backed securities $ 22,692 $ 259 $ — $ 22,951 $ 56,804 $ 295 $ 14 $ 57,085 Corporate securities 10,160 240 — 10,400 10,259 91 — 10,350 Total investment securities held-to-maturity $ 32,852 $ 499 $ — $ 33,351 $ 67,063 $ 386 $ 14 $ 67,435
Contractual Maturities of Available-for-Sale Securities	The amortized cost and estimated fair value of available-for-sale debt securities by contractual maturities are summarized in the table below (dollars in thousands) : Debt Securities Available-for-Sale Distribution of Maturities (1) December 31, 2017 1 Year or Less 1-5 Years 5-10 Years After 10 Years Total Amortized Cost: U.S. Government securities $ 2,498 $ 62,730 $ 4,975 $ — $ 70,203 Residential mortgage-backed securities — nonagency — — — 115,639 115,639 Residential mortgage-backed securities — agency — 42,269 140,793 399,783 582,845 Corporate securities 21,623 71,155 14,000 1,883 108,661 Total debt securities $ 24,121 $ 176,154 $ 159,768 $ 517,305 $ 877,348 Fair Value: U.S. Government securities $ 2,498 $ 62,091 $ 4,970 $ — $ 69,559 Residential mortgage-backed securities — nonagency — — — 118,710 118,710 Residential mortgage-backed securities — agency — 41,677 138,607 395,565 575,849 Corporate securities 21,632 71,538 14,571 2,111 109,852 Total debt securities $ 24,130 $ 175,306 $ 158,148 $ 516,386 $ 873,970 Debt Securities Held-to-Maturity Distribution of Maturities (1) December 31, 2017 1 Year or 1-5 5-10 After 10 Total Amortized Cost: Asset-backed securities $ — $ — $ 7,192 $ 15,500 $ 22,692 Corporate securities — — 10,160 — 10,160 Total debt securities $ — $ — $ 17,352 $ 15,500 $ 32,852 Fair Value: Asset-backed securities $ — $ — $ 7,286 $ 15,665 $ 22,951 Corporate securities — — 10,400 — 10,400 Total debt securities $ — $ — $ 17,686 $ 15,665 $ 33,351 (1) Actual cash flows may differ from contractual maturities as borrowers may prepay obligations without prepayment penalties.
Unrealized Losses on Investment Securities	The following tables provide information regarding securities with unrealized losses (dollars in thousands) : Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Investment Securities Available-for-Sale December 31, 2017 U.S. Government securities $ 46,625 $ 364 $ 20,436 $ 280 $ 67,061 $ 644 Residential mortgage-backed securities — nonagency 1,403 3 6,269 109 7,672 112 Residential mortgage-backed securities — agency 312,617 2,548 210,862 4,767 523,479 7,315 Corporate securities 34,010 108 — — 34,010 108 Total temporarily impaired securities $ 394,655 $ 3,023 $ 237,567 $ 5,156 $ 632,222 $ 8,179 December 31, 2016 U.S. Government securities $ 43,958 $ 465 $ — $ — $ 43,958 $ 465 Residential mortgage-backed securities — nonagency 29,403 239 23,991 400 53,394 639 Residential mortgage-backed securities — agency 430,490 4,484 18,795 241 449,285 4,725 Corporate securities 22,944 83 — — 22,944 83 Total temporarily impaired securities $ 526,795 $ 5,271 $ 42,786 $ 641 $ 569,581 $ 5,912 Less than 12 Months 12 Months or More Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Investment Securities Held-to-Maturity December 31, 2017 Asset-backed securities $ — $ — $ — $ — $ — $ — Corporate securities — — — — — — Total temporarily impaired securities $ — $ — $ — $ — $ — $ — December 31, 2016 Asset-backed securities $ 6,486 $ 14 $ — $ — $ 6,486 $ 14 Corporate securities — — — — — — Total temporarily impaired securities $ 6,486 $ 14 $ — $ — $ 6,486 $ 14
Schedule of Proceeds from Sales and Redemptions of Available for Sale Securities	Sales and calls of securities available-for-sale are summarized in the following table (dollars in thousands) : December 31 2017 2016 2015 Proceeds from sales and calls $ 233,946 $ 113,589 $ 364,023 Gross gains on sales and calls $ 122 $ 489 $ 618 Gross losses on sales and calls (1,575 ) — (264 ) Net realized gains on sales and calls $ (1,453 ) $ 489 $ 354

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Schedule of Loans	Loans, in total, are summarized as follows (dollars in thousands) : December 31 Total Loans 2017 2016 Construction, land & land development $ 451,993 $ 567,763 Other commercial real estate 1,255,002 1,025,063 Total commercial real estate 1,706,995 1,592,826 Residential real estate 333,086 343,398 Owner-occupied real estate 399,370 395,863 Commercial, financial & agricultural 973,440 368,120 Leases 52,396 71,724 Consumer 66,906 42,641 Total loans 3,532,193 2,814,572 Allowance for loan and lease losses (28,750 ) (26,598 ) Total loans, net $ 3,503,443 $ 2,787,974 Organic loans, which we define as loans not purchased in the acquisition of an institution or credit impaired portfolio, are summarized as follows (dollars in thousands) : December 31 Organic Loans 2017 2016 Construction, land & land development $ 412,540 $ 500,018 Other commercial real estate 949,594 754,790 Total commercial real estate 1,362,134 1,254,808 Residential real estate 196,225 144,295 Owner-occupied real estate 260,273 256,317 Commercial, financial & agricultural 430,205 327,381 Leases 52,396 71,724 Consumer 64,610 36,039 Total organic loans (1) 2,365,843 2,090,564 Allowance for loan and lease losses (24,039 ) (21,086 ) Total organic loans, net $ 2,341,804 $ 2,069,478 (1) I ncludes net deferred loan fees that totaled approximately $9.3 million and $7.0 million at December 31, 2017 and 2016 , respectively. Purchased non-credit impaired loans ("PNCI loans"), net of related discounts, are summarized as follows (dollars in thousands) : December 31 Purchased Non-Credit Impaired Loans 2017 2016 Construction, land & land development $ 25,908 $ 51,208 Other commercial real estate 218,660 209,531 Total commercial real estate 244,568 260,739 Residential real estate 96,529 144,596 Owner-occupied real estate 118,294 115,566 Commercial, financial & agricultural 529,184 36,206 Consumer 2,161 6,255 Total purchased non-credit impaired loans (1) 990,736 563,362 Allowance for loan and lease losses (995 ) (439 ) Total purchased non-credit impaired loans, net $ 989,741 $ 562,923 (1) I ncludes net discounts that totaled approximately $12.7 million and $10.5 million at December 31, 2017 and 2016 , respectively. Purchased credit impaired loans ("PCI loans"), net of related discounts, are summarized as follows (dollars in thousands) : December 31 Purchased Credit Impaired Loans 2017 2016 Construction, land & land development $ 13,545 $ 16,537 Other commercial real estate 86,748 60,742 Total commercial real estate 100,293 77,279 Residential real estate 40,332 54,507 Owner-occupied real estate 20,803 23,980 Commercial, financial & agricultural 14,051 4,533 Consumer 135 347 Total purchased credit impaired loans 175,614 160,646 Allowance for loan and lease losses (3,716 ) (5,073 ) Total purchased credit impaired loans, net $ 171,898 $ 155,573
Schedule of Purchased Credit Impaired Loans Rollforward	Changes in the carrying value of net purchased credit impaired loans are presented in the following table (dollars in thousands) : December 31 Purchased Credit Impaired Loans 2017 2016 Balance, beginning of year $ 155,573 $ 137,777 Accretion of fair value discounts 34,096 43,310 Fair value of acquired loans 77,551 40,133 Reductions in principal balances resulting from repayments, write-offs and foreclosures (96,679 ) (68,372 ) Change in the allowance for loan and lease losses on purchased credit impaired loans 1,357 2,725 Balance, end of year $ 171,898 $ 155,573
Schedule of Change in Accretable Discount	Changes in the value of the accretable discount are presented in the following table for the periods presented (dollars in thousands) : December 31 Changes in Accretable Discount 2017 2016 2015 Balance, beginning of year $ 69,301 $ 86,100 $ 120,061 Additions from acquisitions 11,664 5,824 317 Accretion (34,096 ) (43,310 ) (49,830 ) Transfers to accretable discounts and exit events, net 11,058 20,687 15,552 Balance, end of year $ 57,927 $ 69,301 $ 86,100

Allowance for Loan and Lease 39

Allowance for Loan and Lease Losses (ALLL) (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Schedule of Credit Losses Related to Financing Receivables, Current and Noncurrent	The following table summarizes the Company’s loan loss experience on the total loan portfolio as well as the breakdown between the organic, purchased non-credit impaired, and purchased credit impaired portfolios for the periods presented (dollars in thousands) : December 31 2017 2016 2015 Total Loans Balance, beginning of period $ 26,598 $ 29,075 $ 28,638 Charge-offs (4,418 ) (6,174 ) (12,494 ) Recoveries 460 3,460 8,400 Net charge-offs (3,958 ) (2,714 ) (4,094 ) Provision for loan and lease losses before amount attributable to FDIC loss share agreements 6,110 237 4,531 Amount attributable to FDIC loss share agreements — — (1,045 ) Total provision for loan and lease losses charged to operations 6,110 237 3,486 Provision for loan and lease losses recorded through the FDIC loss share receivable — — 1,045 Balance, end of period $ 28,750 $ 26,598 $ 29,075 Organic Loans Balance, beginning of period $ 21,086 $ 21,224 $ 18,392 Charge-offs (2,462 ) (3,411 ) (313 ) Recoveries 373 223 288 Net charge-offs (2,089 ) (3,188 ) (25 ) Provision for loan and lease losses 5,042 3,050 2,857 Balance, end of period $ 24,039 $ 21,086 $ 21,224 Purchased Non-Credit Impaired Loans Balance, beginning of period $ 439 $ 53 $ — Charge-offs (670 ) (223 ) (48 ) Recoveries 87 63 7 Net charge-offs (583 ) (160 ) (41 ) Provision for loan and lease losses 1,139 546 94 Balance, end of period $ 995 $ 439 $ 53 Purchased Credit Impaired Loans Balance, beginning of period $ 5,073 $ 7,798 $ 10,246 Charge-offs (1,286 ) (2,540 ) (12,133 ) Recoveries — 3,174 8,105 Net (charge-offs) recoveries (1,286 ) 634 (4,028 ) Provision for loan and lease losses before amount attributable to FDIC loss share agreements (71 ) (3,359 ) 1,580 Amount attributable to FDIC loss share agreements — — (1,045 ) Total provision for loan and lease losses charged to operations (71 ) (3,359 ) 535 Provision for loan and lease losses recorded through the FDIC loss share receivable — — 1,045 Balance, end of period $ 3,716 $ 5,073 $ 7,798
Allowance for Credit Losses on Financing Receivables	Activity in the allowance for loan and lease losses on purchased non-credit impaired loans is detailed as follows by portfolio segment for the periods presented (dollars in thousands) : Purchased Non-Credit Impaired Loans Commercial Real Estate Residential Real Estate Owner- Occupied Real Estate Commercial, Financial & Agricultural Consumer Total December 31, 2017 Beginning balance $ 88 $ 72 $ 44 $ 235 $ — $ 439 Charge-offs (50 ) (7 ) (80 ) (524 ) (9 ) (670 ) Recoveries 26 11 — 43 7 87 Provision 166 588 124 254 7 1,139 Ending balance $ 230 $ 664 $ 88 $ 8 $ 5 $ 995 December 31, 2016 Beginning balance $ — $ 53 $ — $ — $ — $ 53 Charge-offs — (83 ) — (137 ) (3 ) (223 ) Recoveries — 45 — — 18 63 Provision 88 57 44 372 (15 ) 546 Ending balance $ 88 $ 72 $ 44 $ 235 $ — $ 439 December 31, 2015 Beginning balance $ — $ — $ — $ — $ — $ — Charge-offs — (24 ) — — (24 ) (48 ) Recoveries — 1 — — 6 7 Provision — 76 — — 18 94 Ending balance $ — $ 53 $ — $ — $ — $ 53 The following table presents the balance of purchased non-credit impaired loans and the allowance for loan and lease losses based on the method of determining the allowance at the date indicated (dollars in thousands). Allowance for Loan and Lease Losses Loans Purchased Non-Credit Impaired Loans Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Allowance Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Loans December 31, 2017 Commercial real estate $ — $ 230 $ 230 $ — $ 244,568 $ 244,568 Residential real estate — 664 664 19 96,510 96,529 Owner-occupied real estate — 88 88 3,264 115,030 118,294 Commercial, financial & agricultural 8 — 8 1,491 527,693 529,184 Consumer — 5 5 — 2,161 2,161 Total purchased non-credit impaired loans $ 8 $ 987 $ 995 $ 4,774 $ 985,962 $ 990,736 December 31, 2016 Commercial real estate $ — $ 88 $ 88 $ — $ 260,739 $ 260,739 Residential real estate — 72 72 157 144,439 144,596 Owner-occupied real estate 44 — 44 1,686 113,880 115,566 Commercial, financial & agricultural — 235 235 568 35,638 36,206 Consumer — — — — 6,255 6,255 Total purchased non-credit impaired loans $ 44 $ 395 $ 439 $ 2,411 $ 560,951 $ 563,362 Activity in the allowance for loan and lease losses on purchased credit impaired loans is detailed as follows by portfolio segment for the periods presented (dollars in thousands) : Purchased Credit Impaired Loans Commercial Real Estate Residential Real Estate Owner-Occupied Real Estate Commercial, Financial & Agricultural Consumer Total December 31, 2017 Beginning balance $ 2,183 $ 1,196 $ 1,655 $ 38 $ 1 $ 5,073 Charge-offs (446 ) (140 ) (457 ) (238 ) (5 ) (1,286 ) Recoveries — — — — — — Provision for loan and lease losses before amount attributable to FDIC loss share agreements (31 ) 186 (480 ) 242 12 (71 ) Amount attributable to FDIC loss share agreements — — — — — — Total provision for loan and lease losses charged to operations (31 ) 186 (480 ) 242 12 (71 ) Provision for loan and lease losses recorded through the FDIC loss share receivable — — — — — — Ending balance $ 1,706 $ 1,242 $ 718 $ 42 $ 8 $ 3,716 December 31, 2016 Beginning balance $ 3,388 $ 1,893 $ 2,449 $ 60 $ 8 $ 7,798 Charge-offs (936 ) (977 ) (298 ) (273 ) (56 ) (2,540 ) Recoveries 2,281 401 207 232 53 3,174 Provision for loan and lease losses before amount attributable to FDIC loss share agreements (2,550 ) (121 ) (703 ) 19 (4 ) (3,359 ) Amount attributable to FDIC loss share agreements — — — — — — Total provision for loan and lease losses charged to operations (2,550 ) (121 ) (703 ) 19 (4 ) (3,359 ) Provision for loan and lease losses recorded through the FDIC loss share receivable — — — — — — Ending balance $ 2,183 $ 1,196 $ 1,655 $ 38 $ 1 $ 5,073 December 31, 2015 Beginning balance $ 5,461 $ 2,298 $ 1,916 $ 567 $ 4 $ 10,246 Charge-offs (7,251 ) (1,441 ) (1,374 ) (1,929 ) (138 ) (12,133 ) Recoveries 5,326 382 1,120 1,080 197 8,105 Provision for loan and lease losses before amount attributable to FDIC loss share agreements (148 ) 654 787 342 (55 ) 1,580 Amount attributable to FDIC loss share agreements (313 ) (182 ) (402 ) (140 ) (8 ) (1,045 ) Total provision for loan and lease losses charged to operations (461 ) 472 385 202 (63 ) 535 Provision for loan and lease losses recorded through the FDIC loss share receivable 313 182 402 140 8 1,045 Ending balance $ 3,388 $ 1,893 $ 2,449 $ 60 $ 8 $ 7,798 The following table presents the balance of purchased credit impaired loans and the allowance for loan and lease losses based on the method of determining the allowance at the dates indicated (dollars in thousands) : Allowance for Loan and Lease Losses Loans Purchased Credit Impaired Loans Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Allowance Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Loans December 31, 2017 Commercial real estate $ 1,052 $ 654 $ 1,706 $ 38,444 $ 61,849 $ 100,293 Residential real estate 128 1,114 1,242 3,029 37,303 40,332 Owner-occupied real estate 586 132 718 9,483 11,320 20,803 Commercial, financial & agricultural 32 10 42 2,318 11,733 14,051 Consumer — 8 8 — 135 135 Total purchased credit impaired loans $ 1,798 $ 1,918 $ 3,716 $ 53,274 $ 122,340 $ 175,614 December 31, 2016 Commercial real estate $ 760 $ 1,423 $ 2,183 $ 29,387 $ 47,892 $ 77,279 Residential real estate 156 1,040 1,196 1,897 52,610 54,507 Owner-occupied real estate 1,471 184 1,655 8,376 15,604 23,980 Commercial, financial & agricultural 2 36 38 86 4,447 4,533 Consumer — 1 1 8 339 347 Total purchased credit impaired loans $ 2,389 $ 2,684 $ 5,073 $ 39,754 $ 120,892 $ 160,646 Activity in the allowance for loan and lease losses on organic loans is detailed as follows by portfolio segment for the periods presented (dollars in thousands) : Organic Loans Commercial Real Estate Residential Real Estate Owner- Occupied Real Estate Commercial, Financial & Agricultural Leases Consumer Total December 31, 2017 Beginning balance $ 11,767 $ 1,786 $ 2,239 $ 4,093 $ 655 $ 546 $ 21,086 Charge-offs (933 ) (61 ) — (380 ) (728 ) (360 ) (2,462 ) Recoveries — 14 — 133 182 44 373 Provision 2,203 1,070 (164 ) 689 520 724 5,042 Ending balance $ 13,037 $ 2,809 $ 2,075 $ 4,535 $ 629 $ 954 $ 24,039 December 31, 2016 Beginning balance $ 13,607 $ 2,053 $ 1,920 $ 2,509 $ 865 $ 270 $ 21,224 Charge-offs (2,122 ) (53 ) — (653 ) (486 ) (97 ) (3,411 ) Recoveries — 6 45 154 11 7 223 Provision 282 (220 ) 274 2,083 265 366 3,050 Ending balance $ 11,767 $ 1,786 $ 2,239 $ 4,093 $ 655 $ 546 $ 21,086 December 31, 2015 Beginning balance $ 13,134 $ 1,190 $ 1,928 $ 1,770 $ 262 $ 108 $ 18,392 Charge-offs (3 ) — — (289 ) — (21 ) (313 ) Recoveries 173 10 — 98 — 7 288 Provision 303 853 (8 ) 930 603 176 2,857 Ending balance $ 13,607 $ 2,053 $ 1,920 $ 2,509 $ 865 $ 270 $ 21,224 The following table presents the balance of organic loans and the allowance for loan and lease losses based on the method of determining the allowance at the dates indicated (dollars in thousands) : Allowance for Loan and Lease Losses Loans Organic Loans Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Allowance Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Loans December 31, 2017 Commercial real estate $ — $ 13,037 $ 13,037 $ 3,822 $ 1,358,312 $ 1,362,134 Residential real estate — 2,809 2,809 49 196,176 196,225 Owner-occupied real estate 65 2,010 2,075 808 259,465 260,273 Commercial, financial & agricultural 34 4,501 4,535 280 429,925 430,205 Leases — 629 629 — 52,396 52,396 Consumer — 954 954 — 64,610 64,610 Total organic loans $ 99 $ 23,940 $ 24,039 $ 4,959 $ 2,360,884 $ 2,365,843 December 31, 2016 Commercial real estate $ 148 $ 11,619 $ 11,767 $ 4,950 $ 1,249,858 $ 1,254,808 Residential real estate — 1,786 1,786 — 144,295 144,295 Owner-occupied real estate — 2,239 2,239 — 256,317 256,317 Commercial, financial & agricultural 1 4,092 4,093 9 327,372 327,381 Leases — 655 655 — 71,724 71,724 Consumer — 546 546 — 36,039 36,039 Total organic loans $ 149 $ 20,937 $ 21,086 $ 4,959 $ 2,085,605 $ 2,090,564
Impaired Financing Receivables	Impaired loans, segregated by class of loans, are presented in the following table (dollars in thousands) : December 31, 2017 December 31, 2016 Impaired Loans (1): Unpaid Principal Balance Recorded Investment Related Allowance Unpaid Principal Balance Recorded Investment Related Allowance With no related allowance recorded: Construction, land & land development $ 82 $ 79 $ — $ 4,565 $ 2,933 $ — Other commercial real estate 4,617 3,822 — 56 56 — Total commercial real estate 4,699 3,901 — 4,621 2,989 — Residential real estate 453 456 — 388 320 — Owner-occupied real estate 4,172 4,015 — 193 188 — Commercial, financial & agricultural 2,739 1,882 — 1,335 1,128 — Consumer 51 40 — 2 2 — Subtotal 12,114 10,294 — 6,539 4,627 — With related allowance recorded: Construction, land & land development 113 112 56 4,277 2,124 201 Other commercial real estate — — — — — — Total commercial real estate 113 112 56 4,277 2,124 201 Residential real estate 1,452 1,399 699 891 825 413 Owner-occupied real estate 350 335 125 1,706 1,687 44 Commercial, financial & agricultural 872 821 318 308 298 146 Consumer 83 81 40 55 54 27 Subtotal 2,870 2,748 1,238 7,237 4,988 831 Total impaired loans $ 14,984 $ 13,042 $ 1,238 $ 13,776 $ 9,615 $ 831 (1) Includes loans with SBA guaranteed balances of $5.7 million and $3.0 million at December 31, 2017 and December 31, 2016 , respectively. The following table presents information related to the average recorded investment and interest income recognized on impaired loans for the periods presented (dollars in thousands) : December 31, 2017 December 31, 2016 December 31, 2015 Impaired Loans: Average Recorded Investment (1) Interest Income Recognized (2) Average Recorded Investment (1) Interest Income Recognized (2) Average Recorded Investment (1) Interest Income Recognized (2) Construction, land & land development $ 3,526 $ — $ 5,824 $ — $ 3,354 $ 75 Other commercial real estate 2,076 8 165 — 1,106 56 Total commercial real estate 5,602 8 5,989 — 4,460 131 Residential real estate 1,218 — 1,641 — 818 18 Owner-occupied real estate 3,150 — 538 3 542 15 Commercial, financial & agricultural 2,565 1 1,670 24 733 20 Consumer 85 — 43 — 39 1 Total impaired loans $ 12,620 $ 9 $ 9,881 $ 27 $ 6,592 $ 185 (1) The average recorded investment for troubled debt restructurings was $2.8 million , $6.0 million and $3.5 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. (2) The total interest income recognized on troubled debt restructurings was $8,000 , $24,000 and $82,000 for the years ended December 31, 2017 , 2016 , 2015 , respectively.
Nonaccrual Loans	The following table presents the recorded investment in nonaccrual loans by loan class at the dates indicated (dollars in thousands) : December 31 Nonaccrual Loans 2017 2016 Construction, land & land development $ 191 $ 5,057 Other commercial real estate 3,257 56 Total commercial real estate 3,448 5,113 Residential real estate 1,855 1,146 Owner-occupied real estate 4,350 1,874 Commercial, financial & agricultural 2,703 1,426 Consumer 121 56 Total nonaccrual loans $ 12,477 $ 9,615
Past Due Financing Receivables	The following table presents an analysis of past due organic loans, by class of loans, at the dates indicated (dollars in thousands) : Organic Loans 30 - 89 Days Past Due 90 Days or greater Past Due Total Past Due Current Total Loans Loans > 90 Days and Accruing December 31, 2017 Construction, land & land development $ 487 $ 45 $ 532 $ 412,008 $ 412,540 $ — Other commercial real estate — — — 949,594 949,594 — Total commercial real estate 487 45 532 1,361,602 1,362,134 — Residential real estate 1,868 92 1,960 194,265 196,225 — Owner-occupied real estate 474 713 1,187 259,086 260,273 — Commercial, financial & agricultural 865 122 987 429,218 430,205 — Leases — — — 52,396 52,396 — Consumer 67 28 95 64,515 64,610 — Total organic loans $ 3,761 $ 1,000 $ 4,761 $ 2,361,082 $ 2,365,843 $ — December 31, 2016 Construction, land & land development $ 49 $ 12 $ 61 $ 499,957 $ 500,018 $ — Other commercial real estate — — — 754,790 754,790 — Total commercial real estate 49 12 61 1,254,747 1,254,808 — Residential real estate 157 118 275 144,020 144,295 — Owner-occupied real estate 40 — 40 256,277 256,317 — Commercial, financial & agricultural 247 283 530 326,851 327,381 — Leases — — — 71,724 71,724 — Consumer 350 31 381 35,658 36,039 — Total organic loans $ 843 $ 444 $ 1,287 $ 2,089,277 $ 2,090,564 $ — The following table presents an analysis of past due purchased non-credit impaired loans, by class of loans, at the dates indicated (dollars in thousands) : Purchased Non-Credit Impaired Loans 30 - 89 Days Past Due 90 Days or greater Past Due Total Past Due Current Total Loans Loans > 90 Days and Accruing December 31, 2017 Construction, land & land development $ 35 $ — $ 35 $ 25,873 $ 25,908 $ — Other commercial real estate — 45 45 218,615 218,660 — Total commercial real estate 35 45 80 244,488 244,568 — Residential real estate 537 126 663 95,866 96,529 — Owner-occupied real estate 283 1,590 1,873 116,421 118,294 — Commercial, financial & agricultural 640 628 1,268 527,916 529,184 — Consumer 28 13 41 2,120 2,161 — Total purchased non-credit impaired loans $ 1,523 $ 2,402 $ 3,925 $ 986,811 $ 990,736 $ — December 31, 2016 Construction, land & land development $ 495 $ — $ 495 $ 50,713 $ 51,208 $ — Other commercial real estate 17 56 73 209,458 209,531 — Total commercial real estate 512 56 568 260,171 260,739 — Residential real estate 274 165 439 144,157 144,596 — Owner-occupied real estate 387 1,687 2,074 113,492 115,566 — Commercial & industrial 144 552 696 35,510 36,206 — Consumer 38 2 40 6,215 6,255 — Total purchased non-credit impaired loans $ 1,355 $ 2,462 $ 3,817 $ 559,545 $ 563,362 $ — The following table presents an analysis of past due purchased credit impaired loans, by class of loans, at the dates indicated (dollars in thousands) : Purchased Credit Impaired Loans 30 - 89 Days Past Due 90 Days or greater Past Due Total Past Due Current Total Loans December 31, 2017 Construction, land & land development $ 1 $ 1,881 $ 1,882 $ 11,663 $ 13,545 Other commercial real estate 363 3,303 3,666 83,082 86,748 Total commercial real estate 364 5,184 5,548 94,745 100,293 Residential real estate 1,519 1,876 3,395 36,937 40,332 Owner-occupied real estate 85 786 871 19,932 20,803 Commercial, financial & agricultural 201 224 425 13,626 14,051 Consumer — 15 15 120 135 Total purchased credit impaired loans $ 2,169 $ 8,085 $ 10,254 $ 165,360 $ 175,614 December 31, 2016 Construction, land & land development $ 722 $ 1,853 $ 2,575 $ 13,962 $ 16,537 Other commercial real estate 346 3,148 3,494 57,248 60,742 Total commercial real estate 1,068 5,001 6,069 71,210 77,279 Residential real estate 1,210 2,787 3,997 50,510 54,507 Owner-occupied real estate 661 3,507 4,168 19,812 23,980 Commercial, financial & agricultural 29 61 90 4,443 4,533 Consumer — 5 5 342 347 Total purchased credit impaired loans $ 2,968 $ 11,361 $ 14,329 $ 146,317 $ 160,646
Financing Receivable Credit Quality Indicators	The following table presents the risk grades of the purchased credit impaired loan portfolio, by class of loans, at the dates indicated (dollars in thousands) : Purchased Credit Impaired Loans Pass Watch OAEM Substandard Doubtful Total December 31, 2017 Construction, land & land development $ 6,677 $ 809 $ 973 $ 5,086 $ — $ 13,545 Other commercial real estate 63,210 11,998 2,361 9,179 — 86,748 Total commercial real estate 69,887 12,807 3,334 14,265 — 100,293 Residential real estate 21,706 6,419 1,590 10,504 113 40,332 Owner-occupied real estate 7,181 4,896 818 7,908 — 20,803 Commercial, financial & agricultural 2,094 211 323 11,423 — 14,051 Consumer 60 28 21 26 — 135 Total purchased credit impaired loans $ 100,928 $ 24,361 $ 6,086 $ 44,126 $ 113 $ 175,614 December 31, 2016 Construction, land & land development $ 7,798 $ 1,150 $ 1,416 $ 6,173 $ — $ 16,537 Other commercial real estate 33,423 13,103 2,770 11,446 — 60,742 Total commercial real estate 41,221 14,253 4,186 17,619 — 77,279 Residential real estate 28,628 10,371 2,840 12,396 272 54,507 Owner-occupied real estate 7,736 4,884 794 10,566 — 23,980 Commercial, financial & agricultural 3,381 310 273 569 — 4,533 Consumer 53 100 173 21 — 347 Total purchased credit impaired loans $ 81,019 $ 29,918 $ 8,266 $ 41,171 $ 272 $ 160,646 The following table presents the risk grades of the purchased non-credit impaired loan portfolio, by class of loans, at the dates indicated (dollars in thousands) : Purchased Non-Credit Impaired Loans Pass Watch OAEM Substandard Doubtful Total December 31, 2017 Construction, land & land development $ 25,486 $ 385 $ — $ 37 $ — $ 25,908 Other commercial real estate 214,916 1,341 1,825 578 — 218,660 Total commercial real estate 240,402 1,726 1,825 615 — 244,568 Residential real estate 92,119 2,216 791 1,369 34 96,529 Owner-occupied real estate 110,034 3,227 1,280 3,753 — 118,294 Commercial, financial & agricultural 452,822 59,306 5,223 11,833 — 529,184 Consumer 2,091 3 — 37 30 2,161 Total purchased non-credit impaired loans $ 897,468 $ 66,478 $ 9,119 $ 17,607 $ 64 $ 990,736 December 31, 2016 Construction, land & land development $ 51,208 $ — $ — $ — $ — $ 51,208 Other commercial real estate 206,515 803 2,157 56 — 209,531 Total commercial real estate 257,723 803 2,157 56 — 260,739 Residential real estate 142,079 1,883 314 320 — 144,596 Owner-occupied real estate 107,096 6,310 — 2,160 — 115,566 Commercial, financial & agricultural 34,747 310 21 1,128 — 36,206 Consumer 6,247 5 — 3 — 6,255 Total purchased non-credit impaired loans $ 547,892 $ 9,311 $ 2,492 $ 3,667 $ — $ 563,362 The following table presents the risk grades of the organic loan portfolio, by class of loans, at the dates indicated (dollars in thousands) : Organic Loans Pass Watch OAEM Substandard Doubtful Total December 31, 2017 Construction, land & land development $ 371,358 $ 38,939 $ 2,086 $ 157 $ — $ 412,540 Other commercial real estate 920,168 22,229 3,365 3,832 — 949,594 Total commercial real estate 1,291,526 61,168 5,451 3,989 — 1,362,134 Residential real estate 188,918 3,668 1,488 2,151 — 196,225 Owner-occupied real estate 240,987 16,891 1,067 1,328 — 260,273 Commercial, financial & agricultural 421,114 7,870 123 1,098 — 430,205 Leases 47,908 4,488 — — — 52,396 Consumer 64,361 58 81 110 — 64,610 Total organic loans $ 2,254,814 $ 94,143 $ 8,210 $ 8,676 $ — $ 2,365,843 December 31, 2016 Construction, land & land development $ 470,686 $ 24,178 $ 97 $ 5,057 $ — $ 500,018 Other commercial real estate 718,969 35,821 — — — 754,790 Total commercial real estate 1,189,655 59,999 97 5,057 — 1,254,808 Residential real estate 139,393 2,484 460 1,958 — 144,295 Owner-occupied real estate 237,753 14,967 3,577 20 — 256,317 Commercial, financial & agricultural 325,161 920 624 676 — 327,381 Leases 60,849 10,875 — — — 71,724 Consumer 35,844 47 2 145 1 36,039 Total organic loans $ 1,988,655 $ 89,292 $ 4,760 $ 7,856 $ 1 $ 2,090,564
Troubled Debt Restructurings on Financing Receivables	The following table provides information on troubled debt restructured loans that were modified during the periods presented (dollars in thousands) : December 31, 2017 December 31, 2016 December 31, 2015 TDR Additions (1) Number of Contracts Pre-Modification Recorded Investment Post-Modification Recorded Investment Number of Contracts Pre-Modification Recorded Investment Post-Modification Recorded Investment Number of Contracts Pre-Modification Recorded Investment Post-Modification Recorded Investment Construction, land & land development — $ — $ — 1 $ 4,168 $ 4,168 — $ — $ — Other commercial real estate 1 569 569 — — — — — — Total commercial real estate 1 569 569 1 4,168 4,168 — — — Residential real estate — — — — — — — — — Owner-occupied real estate 1 884 884 — — — — — — Commercial, financial & agricultural — — — — — — 1 577 577 Total modifications 2 $ 1,453 $ 1,453 1 $ 4,168 $ 4,168 1 $ 577 $ 577 (1) The pre-modification and post-modification recorded investments represent amounts at the date of loan modifications. Since the modifications on these loans have been only interest rate concessions and payment term extensions, not principal reductions, the pre-modification and post-modification recorded investment amounts are the same.

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment, and Leases [Abstract]
Property, Plant and Equipment	Premises and equipment are summarized as follows (dollars in thousands) : December 31 2017 2016 Land $ 14,849 $ 14,632 Buildings and improvements 38,742 37,856 Furniture, fixtures, and equipment 18,939 16,961 Construction in progress 550 426 Premises and equipment, gross 73,080 69,875 Accumulated depreciation (21,286 ) (17,819 ) Premises and equipment, net $ 51,794 $ 52,056
Schedule of Future Minimum Rental Payments for Operating Leases	Future minimum lease commitments under all noncancelable operating leases with terms of one year or more, excluding any renewal options, are as follows (dollars in thousands) : Years Ended December 31 Future Lease Commitments 2018 $ 4,627 2019 3,347 2020 3,261 2021 2,980 2022 3,049 Thereafter 3,518 Total (1) $ 20,782 (1) The total future minimum lease commitments have not been reduced by minimum sublease rentals of $3.4 million due in the future from noncancelable subleases.

Goodwill and Other Intangible41

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill and Identifiable Intangible Assets	Changes to the carrying amounts of goodwill and identifiable intangible assets are presented in the table below (dollars in thousands) : December 31 2017 2016 Goodwill Balance, beginning of year $ 77,084 $ 36,357 Goodwill attributable to acquisitions 7,480 40,727 Balance, end of year 84,564 77,084 Core deposit and other intangibles Balance, beginning of year 21,660 16,910 Core deposit and other intangibles attributable to acquisitions 1,100 4,750 Accumulated amortization (11,726 ) (8,911 ) Balance, end of year 11,034 12,749 Total goodwill and other intangibles $ 95,598 $ 89,833
Schedule of Expected Amortization Expense	Amortization expense for core deposit and other intangibles for the next five years is expected to be as follows (dollars in thousands) : Years Ended December 31 Core Deposit and Other Intangibles Amortization Expense 2018 $ 2,575 2019 2,492 2020 2,107 2021 1,778 2022 1,704 Thereafter 378 Total amortization expense $ 11,034

SBA Servicing Rights (Tables)

SBA Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2017
Transfers and Servicing [Abstract]
Schedule of Servicing Assets at Fair Value	The table below summarizes the activity in the SBA servicing rights asset for the period presented (dollars in thousands) : December 31 SBA Servicing Rights 2017 2016 2015 Balance, beginning of year $ 3,477 $ 2,626 $ 1,516 Additions 1,213 1,323 1,070 Fair value adjustments (621 ) (472 ) 40 Balance, end of year $ 4,069 $ 3,477 $ 2,626
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques	A summary of the key characteristics, inputs and economic assumptions used to estimate the fair value of the Company's SBA servicing rights asset are as follows (dollars in thousands) : December 31 SBA Servicing Rights 2017 2016 Fair value $ 4,069 $ 3,477 Weighted average discount rate 12.9 % 12.8 % Decline in fair value due to a 100 basis point adverse change $ (140 ) $ (122 ) Decline in fair value due to a 200 basis point adverse change (272 ) (236 ) Prepayment speed 9.1 % 8.0 % Decline in fair value due to a 10% adverse change $ (141 ) $ (108 ) Decline in fair value due to a 20% adverse change (275 ) (210 ) Weighted average remaining life (years) 6.7 7.1 The following tables provide information describing the unobservable inputs used in Level 3 fair value measurements at the dates indicated (dollars in thousands) : December 31, 2017 Fair Value Valuation Technique Unobservable Inputs Range (Weighted Average) SBA servicing rights $ 4,069 Discounted cash flows Discount rate 10% - 22% (13%) Prepayment speed 4% - 13% (9%) Mortgage derivatives - asset $ 515 Pricing model Pull-through rate 84% Mortgage derivatives - liability $ 200 Pricing model Pull-through rate 84% Impaired loans - collateral dependent $ 11,804 Third party appraisal Management discount for property type and recent market volatility 0% - 50% (9%) Other real estate owned $ 1,204 Third party appraisal Management discount for property type and recent market volatility 0% - 33% (12%) December 31, 2016 Fair Value Valuation Technique Unobservable Inputs Range (Weighted Average) SBA servicing rights $ 3,477 Discounted cash flows Discount rate 9% - 18% (13%) Prepayment speed 3% - 11% (8%) Mortgage derivatives - asset $ 699 Pricing model Pull-through rate 84% Mortgage derivatives - liability $ 445 Pricing model Pull-through rate 84% Impaired loans - collateral dependent $ 8,784 Third party appraisal Management discount for property type and recent market volatility 0% - 50% (9%) Other real estate owned $ 13,292 Third party appraisal Management discount for property type and recent market volatility 0% - 68% (16%)
Schedule of Servicing Assets Past Due	Information about the SBA loans serviced by the Company at and for the periods presented is as follows (dollars in thousands) : December 31, 2017 SBA Loans Serviced Unpaid Principal Balance 30 - 89 Days Past Due 90 Days or Greater Past Due Net Charge-offs for the year ended December 31, 2017 Serviced for others $ 185,557 $ 1,555 $ — $ — Held-for-sale 10,420 — — — Held-for-investment 153,810 2,508 6,627 684 Total SBA loans serviced $ 349,787 $ 4,063 $ 6,627 $ 684 December 31, 2016 SBA Loans Serviced Unpaid Principal Balance 30 - 89 Days Past Due 90 Days or Greater Past Due Net Charge-offs for the year ended December 31, 2016 Serviced for others $ 142,069 $ 522 $ — $ — Held-for-sale 16,356 — — — Held-for-investment 144,351 220 5,580 1,986 Total SBA loans serviced $ 302,776 $ 742 $ 5,580 $ 1,986

FDIC Receivable for Loss Shar43

FDIC Receivable for Loss Share Agreements (Tables)	12 Months Ended
	Dec. 31, 2017
FDIC Receivable for Loss Sharing Agreements [Abstract]
Schedule of FDIC Indemnification Asset Activity	The following table presents a summary of the calculation of the loss recognized as a result of the termination of the FDIC loss share agreements, including the clawback provisions and settlement of historic loss share and expense reimbursement claims (dollars in thousands) : For the Year Ended December 31, 2015 Cash paid to the FDIC to settle loss share agreements $ (3,100 ) FDIC loss share receivable (16,959 ) FDIC clawback payable 5,511 Loss on termination of FDIC loss share (14,548 ) Net amortization of FDIC receivable for loss share agreements during the period (1,940 ) Amortization of FDIC receivable for loss share agreements $ (16,488 )
FDIC Receivable for Loss Share Agreements	The following table documents changes in the carrying value of the FDIC receivable for loss share agreements relating to purchased credit impaired loans and acquired other real estate owned previously covered under loss share agreements with the FDIC for the periods indicated (dollars in thousands) : For the Year Ended December 31 FDIC receivable for loss share agreements 2015 Balance, beginning of year $ 22,320 Provision for loan and lease losses attributable to FDIC for loss share agreements 1,045 Wires sent (received) 1,784 Net recoveries (6,627 ) Amortization (1,940 ) External expenses qualifying under loss share agreements 377 Termination of FDIC loss share (16,959 ) Balance, end of year $ —

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2017
Banking and Thrift [Abstract]
Schedule of Deposits	Deposits are summarized as follows (dollars in thousands) : December 31 2017 2016 Noninterest-bearing demand deposits $ 1,191,106 $ 984,419 Interest-bearing transaction accounts 688,150 664,350 Savings and money market deposits 1,626,238 1,292,867 Time deposits less than $250,000 560,529 388,164 Time deposits $250,000 or greater 154,604 78,685 Brokered and wholesale time deposits 22,508 22,680 Total deposits $ 4,243,135 $ 3,431,165
Schedule of Maturities of Deposits	The scheduled maturities of time, brokered, and wholesale deposits were as follows (dollars in thousands) : December 31, 2017 2018 $ 576,143 2019 96,001 2020 47,314 2021 10,776 2022 7,407 Total time, brokered, and wholesale deposits $ 737,641

Derivative Instruments and He45

Derivative Instruments and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The table below presents the fair values of the Company's derivatives at the dates indicated (dollars in thousands) : Asset Derivatives (1) Liability Derivatives (1) December 31, 2017 December 31, 2016 December 31, 2017 December 31, 2016 Derivatives Designated as Hedging Instruments Interest rate swaps and caps $ 2,011 $ 1,774 $ 116 $ 641 Derivatives Not Designated as Hedging Instruments Interest rate swaps $ — $ 19 $ — $ 85 Mortgage derivatives 616 1,362 238 459 (1) All asset derivatives are located in "Other Assets" on the consolidated statements of financial condition and all liability derivatives are located in "Other Liabilities" on the consolidated statements of financial condition.
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The table below presents the effect of the Company's derivatives in fair value hedging relationships for the periods presented (dollars in thousands) : December 31 Interest Rate Products Location 2017 2016 2015 Amount of gain (loss) recognized in income on derivatives Noninterest income $ 1,007 $ 1,863 $ (956 ) Amount of (loss) gain recognized in income on hedged items Noninterest income (1,057 ) (1,680 ) 815 Total net (loss) gain recognized in income on fair value hedge ineffectiveness $ (50 ) $ 183 $ (141 )
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The table below presents the effect of the Company's derivatives in cash flow hedging relationships for the periods presented (dollars in thousands) : December 31 Interest Rate Products Location 2017 2016 2015 Amount of gain (loss) recognized in income on derivatives (effective portion) OCI $ 58 $ (714 ) $ (2,294 ) Amount of loss reclassified from AOCI into income (effective portion) Interest expense 1,618 1,171 546 Total loss recognized in consolidated statements of comprehensive income $ (1,560 ) $ (1,885 ) $ (2,840 )
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The table below presents the effect of the Company's derivatives not designated as hedging instruments for the periods presented (dollars in thousands) : December 31 Interest Rate Products Location 2017 2016 2015 Amount of gain (loss) recognized in income on interest rate lock commitments Noninterest income $ 78 $ (280 ) $ 347 Amount of (loss) gain recognized in income on forward commitments Noninterest income (603 ) 819 (34 ) Amount of loss recognized in income on interest rate swaps Noninterest income (124 ) (51 ) (147 ) Amount of (loss) gain recognized in income on derivatives not designated as hedging instruments $ (649 ) $ 488 $ 166

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	12 Months Ended
	Dec. 31, 2017
Offsetting [Abstract]
Offsetting Assets	The table below presents information about the Company’s financial instruments that are eligible for offset in the consolidated statements of financial condition at the dates presented (dollars in thousands) : Gross Amounts Recognized Gross Amounts Offset on the Statement of Financial Condition Net Amounts Presented on the Statement of Financial Condition Gross Amounts Not Offset on the Statement of Financial Condition Net Amount Financial Instruments Collateral Received/Posted (1) December 31, 2017 Offsetting Derivative Assets Interest rate swaps and caps $ 2,011 $ — $ 2,011 $ (116 ) $ (1,895 ) $ — Offsetting Derivative Liabilities Interest rate swaps and caps $ 116 $ — $ 116 $ (116 ) $ — $ — Repurchase agreements 25,209 — 25,209 — (25,209 ) — Total liabilities $ 25,325 $ — $ 25,325 $ (116 ) $ (25,209 ) $ — December 31, 2016 Offsetting Derivative Assets Interest rate swaps and caps $ 1,793 $ — $ 1,793 $ (718 ) $ (1,075 ) $ — Offsetting Derivative Liabilities Interest rate swaps and caps $ 726 $ — $ 726 $ (718 ) $ — $ 8 Repurchase agreements 25,722 — 25,722 — (25,722 ) — Total liabilities $ 26,448 $ — $ 26,448 $ (718 ) $ (25,722 ) $ 8 (1) The application of collateral cannot reduce the net amount below zero; therefore, excess collateral received/posted is not reflected in this table. All positions are fully collateralized.
Offsetting Liabilities	The table below presents information about the Company’s financial instruments that are eligible for offset in the consolidated statements of financial condition at the dates presented (dollars in thousands) : Gross Amounts Recognized Gross Amounts Offset on the Statement of Financial Condition Net Amounts Presented on the Statement of Financial Condition Gross Amounts Not Offset on the Statement of Financial Condition Net Amount Financial Instruments Collateral Received/Posted (1) December 31, 2017 Offsetting Derivative Assets Interest rate swaps and caps $ 2,011 $ — $ 2,011 $ (116 ) $ (1,895 ) $ — Offsetting Derivative Liabilities Interest rate swaps and caps $ 116 $ — $ 116 $ (116 ) $ — $ — Repurchase agreements 25,209 — 25,209 — (25,209 ) — Total liabilities $ 25,325 $ — $ 25,325 $ (116 ) $ (25,209 ) $ — December 31, 2016 Offsetting Derivative Assets Interest rate swaps and caps $ 1,793 $ — $ 1,793 $ (718 ) $ (1,075 ) $ — Offsetting Derivative Liabilities Interest rate swaps and caps $ 726 $ — $ 726 $ (718 ) $ — $ 8 Repurchase agreements 25,722 — 25,722 — (25,722 ) — Total liabilities $ 26,448 $ — $ 26,448 $ (718 ) $ (25,722 ) $ 8 (1) The application of collateral cannot reduce the net amount below zero; therefore, excess collateral received/posted is not reflected in this table. All positions are fully collateralized.

Stock Warrants (Tables)

Stock Warrants (Tables)	12 Months Ended
	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Schedule of Stockholders' Equity Note, Warrants or Rights	The following table represents the activity related to stock warrants: December 31 2017 2016 Number of Warrants Weighted Average Exercise Price Number of Warrants Weighted Average Exercise Price Outstanding warrants at beginning of year 133,912 $ 9.37 172,745 $ 9.52 Exercised (51,008 ) 8.43 (38,833 ) 10.05 Outstanding warrants at end of year 82,904 $ 9.95 133,912 $ 9.37

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity	The following table represents a summary of the activity related to stock options: December 31, 2017 Number of Options Weighted Average Exercise Price ($) Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value ($000) Outstanding options, beginning of year 28,918 $ 14.37 4.6 361 Exercised (28,918 ) 14.37 — 378 Outstanding options, end of year — $ — — $ —
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	The following table represents a summary of the unvested restricted stock award activity: December 31, 2017 Shares Weighted Average Grant Date Fair Value Balance, beginning of year 1,006,052 $ 18.28 Granted 146,254 27.10 Forfeited (13,583 ) 19.95 Earned and issued (161,061 ) 16.89 Balance, end of year 977,662 $ 19.80

Commitments and Contingent Li49

Commitments and Contingent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Summary of Commitments	A summary of the Company's commitments is as follows (dollars in thousands) : December 31 2017 2016 Commitments to extend credit: Fixed $ 65,117 $ 63,166 Variable 914,524 608,176 Letters of credit: Fixed 5,978 6,985 Variable 11,428 3,239 Total commitments $ 997,047 $ 681,566

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2017
Banking and Thrift [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The minimum regulatory capital ratios and ratios to be considered well-capitalized under prompt corrective action provisions at the dates indicated are presented in the table below: December 31, 2017 December 31, 2016 Capital Ratio Requirements Minimum Requirement Well-capitalized (1) Minimum Requirement Well-capitalized (1) Common Equity Tier 1 Capital (CET1) 4.50% 6.50% 4.50% 6.50% Tier 1 Capital 6.00% 8.00% 6.00% 8.00% Total Capital 8.00% 10.00% 8.00% 10.00% Tier 1 Leverage 4.00% 5.00% 4.00% 5.00% (1) The prompt corrective action provisions are only applicable at the bank level. At December 31, 2017 and 2016 , the Company and State Bank exceeded all regulatory capital adequacy requirements to which they were subject. The Company's regulatory ratios at the dates indicated are presented in the table below (dollars in thousands) : December 31, 2017 December 31, 2016 Actual Required Actual Required Amount Ratio Minimum Amount Amount Ratio Minimum Amount Company CET1 Capital $ 547,822 12.61 % $ 195,433 $ 526,282 14.78 % $ 160,258 Tier 1 Capital 547,822 12.61 % 260,578 526,282 14.78 % 213,678 Total Capital 576,572 13.28 % 347,437 552,880 15.52 % 284,904 Tier 1 Leverage 547,822 11.24 % 194,924 526,282 14.90 % 141,273 State Bank's regulatory ratios at the dates indicated are presented in the table below (dollars in thousands) : December 31, 2017 December 31, 2016 Actual Required Actual Required Amount Ratio Minimum Amount Well Capitalized Amount Amount Ratio Minimum Amount Well Capitalized Amount State Bank CET1 Capital $ 481,135 11.10 % $ 194,972 $ 281,626 $ 463,164 13.06 % $ 159,535 $ 230,440 Tier 1 Capital 481,135 11.10 % 259,962 346,617 463,164 13.06 % 212,714 283,618 Total Capital 509,885 11.77 % 346,617 433,271 489,762 13.81 % 283,618 354,523 Tier 1 Leverage 481,135 9.90 % 194,429 243,037 463,164 13.18 % 140,572 175,715

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables present the financial assets and financial liabilities measured at fair value on a recurring basis at the dates indicated, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands) : December 31, 2017 Quoted Market Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: U.S. Government securities $ — $ 69,559 $ — $ 69,559 Residential mortgage-backed securities — nonagency — 118,710 — 118,710 Residential mortgage-backed securities — agency — 575,849 — 575,849 Corporate securities — 109,852 — 109,852 Hedged loans — 139,391 — 139,391 Mortgage loans held-for-sale — 25,791 — 25,791 Mortgage derivatives — 101 515 616 Interest rate swaps and caps — 2,011 — 2,011 SBA servicing rights — — 4,069 4,069 Total recurring assets at fair value $ — $ 1,041,264 $ 4,584 $ 1,045,848 Liabilities: Interest rate swaps and caps $ — $ 116 $ — $ 116 Mortgage derivatives — 38 200 238 Total recurring liabilities at fair value $ — $ 154 $ 200 $ 354 December 31, 2016 Quoted Market Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: U.S. Government securities $ — $ 88,649 $ — $ 88,649 States and political subdivisions — 301 — 301 Residential mortgage-backed securities — nonagency — 154,009 — 154,009 Residential mortgage-backed securities — agency — 529,302 — 529,302 Corporate securities — 74,917 — 74,917 Hedged loans — 167,165 — 167,165 Mortgage loans held-for-sale — 35,813 — 35,813 Mortgage derivatives — 663 699 1,362 Interest rate swaps and caps — 1,793 — 1,793 SBA servicing rights — — 3,477 3,477 Total recurring assets at fair value $ — $ 1,052,612 $ 4,176 $ 1,056,788 Liabilities: Interest rate swaps and caps $ — $ 726 $ — $ 726 Mortgage derivatives — 14 445 459 Total recurring liabilities at fair value $ — $ 740 $ 445 $ 1,185
Fair Value, Assets Measured on a Nonrecurring Basis, Unobservable Input Reconciliation	The following table is a reconciliation of the fair value measurement of other real estate owned disclosed in accordance with ASC Topic 820, Fair Value Measurements and Disclosures , to the amount recorded on the consolidated statements of financial condition (dollars in thousands) : December 31 Other Real Estate Owned 2017 2016 Other real estate owned at fair value $ 1,204 $ 13,292 Estimated selling costs and other adjustments (309 ) (2,395 ) Other real estate owned $ 895 $ 10,897 The following tables present a reconciliation of all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (level 3) for the periods presented (dollars in thousands) : December 31 SBA Servicing Rights 2017 2016 2015 Balance, beginning of year $ 3,477 $ 2,626 $ 1,516 Additions 1,213 1,323 1,070 Fair value adjustments (1) (621 ) (472 ) 40 Balance, end of year $ 4,069 $ 3,477 $ 2,626 (1) Fair value adjustments are recorded as a component of "SBA income" on the consolidated statements of income.
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation	December 31 2017 2016 2015 Mortgage Derivatives Other Assets Other Liabilities Other Assets Other Liabilities Other Other Balance, beginning of year $ 699 $ 445 $ 651 $ 361 $ — $ — Acquired — — — — 272 135 Issuances (1) 2,058 1,367 2,529 2,041 1,934 1,500 Settlements and closed loans (1) (2,242 ) (1,612 ) (2,481 ) (1,957 ) (1,555 ) (1,274 ) Balance, end of year $ 515 $ 200 $ 699 $ 445 $ 651 $ 361 (1) Total gain (loss) on the change in fair value, recorded as a component of "mortgage banking income" on the consolidated statements of income was $61,000 , $(36,000) and $153,000 , respectively for the years ended December 31, 2017 , 2016 and 2015 .
Fair Value Measurements, Financial Assets Measured on a Nonrecurring Basis	The following table presents financial assets measured at fair value on a nonrecurring basis at the dates indicated, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands) : Quoted Market Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total December 31, 2017 Impaired loans $ — $ — $ 11,804 $ 11,804 Total nonrecurring assets at fair value $ — $ — $ 11,804 $ 11,804 December 31, 2016 Impaired loans $ — $ — $ 8,784 $ 8,784 Total nonrecurring assets at fair value $ — $ — $ 8,784 $ 8,784
Fair Value Measurements Nonfinancial Assets Nonrecurring	The following table presents nonfinancial assets measured at fair value on a nonrecurring basis at the dates indicated, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (dollars in thousands) : Quoted Market Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total December 31, 2017 Other real estate owned $ — $ — $ 1,204 $ 1,204 December 31, 2016 Other real estate owned $ — $ — $ 13,292 $ 13,292
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques	A summary of the key characteristics, inputs and economic assumptions used to estimate the fair value of the Company's SBA servicing rights asset are as follows (dollars in thousands) : December 31 SBA Servicing Rights 2017 2016 Fair value $ 4,069 $ 3,477 Weighted average discount rate 12.9 % 12.8 % Decline in fair value due to a 100 basis point adverse change $ (140 ) $ (122 ) Decline in fair value due to a 200 basis point adverse change (272 ) (236 ) Prepayment speed 9.1 % 8.0 % Decline in fair value due to a 10% adverse change $ (141 ) $ (108 ) Decline in fair value due to a 20% adverse change (275 ) (210 ) Weighted average remaining life (years) 6.7 7.1 The following tables provide information describing the unobservable inputs used in Level 3 fair value measurements at the dates indicated (dollars in thousands) : December 31, 2017 Fair Value Valuation Technique Unobservable Inputs Range (Weighted Average) SBA servicing rights $ 4,069 Discounted cash flows Discount rate 10% - 22% (13%) Prepayment speed 4% - 13% (9%) Mortgage derivatives - asset $ 515 Pricing model Pull-through rate 84% Mortgage derivatives - liability $ 200 Pricing model Pull-through rate 84% Impaired loans - collateral dependent $ 11,804 Third party appraisal Management discount for property type and recent market volatility 0% - 50% (9%) Other real estate owned $ 1,204 Third party appraisal Management discount for property type and recent market volatility 0% - 33% (12%) December 31, 2016 Fair Value Valuation Technique Unobservable Inputs Range (Weighted Average) SBA servicing rights $ 3,477 Discounted cash flows Discount rate 9% - 18% (13%) Prepayment speed 3% - 11% (8%) Mortgage derivatives - asset $ 699 Pricing model Pull-through rate 84% Mortgage derivatives - liability $ 445 Pricing model Pull-through rate 84% Impaired loans - collateral dependent $ 8,784 Third party appraisal Management discount for property type and recent market volatility 0% - 50% (9%) Other real estate owned $ 13,292 Third party appraisal Management discount for property type and recent market volatility 0% - 68% (16%)
Fair Value Measurements, Recurring and Nonrecurring	The following table includes the estimated fair value of the Company's financial assets and financial liabilities (dollars in thousands) . The methodologies for estimating the fair value of financial assets and financial liabilities measured on a recurring and nonrecurring basis are discussed above. The methodologies for estimating the fair value for other financial assets and financial liabilities are discussed below. The estimated fair value amounts have been determined by the Company using available market information and appropriate valuation methodologies; however, considerable judgment is required to interpret market data in order to develop the estimates of fair value. Accordingly, the estimates presented below are not necessarily indicative of the amounts the Company could realize in a current market exchange. The use of different market assumptions and/or estimation techniques may have a material effect on the estimated fair value amounts at December 31, 2017 and 2016 . December 31, 2017 December 31, 2016 Fair Value Hierarchy Level Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Assets: Cash and cash equivalents Level 1 $ 230,877 $ 230,877 $ 149,593 $ 149,593 Investment securities available-for-sale Level 2 873,970 873,970 847,178 847,178 Investment securities held-to-maturity Level 2 & 3 32,852 33,351 67,063 67,435 Loans held-for-sale Level 2 36,211 37,580 52,169 53,770 Loans, net Level 2 & 3 3,503,443 3,513,057 2,787,974 2,820,484 Other real estate owned Level 3 895 1,204 10,897 13,292 Interest rate swaps and caps Level 2 2,011 2,011 1,793 1,793 Mortgage derivatives Levels 2 & 3 616 616 1,362 1,362 SBA servicing rights Level 3 4,069 4,069 3,477 3,477 Accrued interest receivable Level 2 14,906 14,906 10,210 10,210 Federal Home Loan Bank stock Level 3 4,651 4,651 5,680 5,680 Liabilities: Deposits Level 2 $ 4,243,135 $ 4,237,883 $ 3,431,165 $ 3,430,405 Federal funds purchased and securities sold under agreements to repurchase Level 2 25,209 25,209 27,673 27,673 FHLB Borrowings Level 2 — — 47,014 47,014 Notes payable Level 2 398 398 398 398 Interest rate swaps and caps Level 2 116 116 726 726 Mortgage derivatives Levels 2 & 3 238 238 459 459 Accrued interest payable Level 2 3,750 3,750 2,312 2,312

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The components of income tax expense were as follows (dollars in thousands) : Years Ended December 31 2017 2016 2015 Current tax provision: Federal $ 27,484 $ 12,599 $ 35,151 State 2,926 540 5,126 Total current tax provision 30,410 13,139 40,277 Deferred tax provision: Federal 10,010 10,958 (20,831 ) State 622 2,087 (3,997 ) Total deferred tax provision 10,632 13,045 (24,828 ) Total income tax provision $ 41,042 $ 26,184 $ 15,449
Schedule of Effective Income Tax Rate Reconciliation	Income tax expense differed from amounts computed by applying the Federal statutory rate of 35% to income before income taxes due to the following factors (dollars in thousands) : Years Ended December 31 2017 2016 2015 Federal taxes at statutory rate $ 30,666 $ 25,821 $ 15,355 Increase (reduction) in income taxes resulting from: State taxes, net of federal benefit 2,306 1,708 734 Tax-exempt interest (361 ) (355 ) (357 ) Bank-owned life insurance income (680 ) (675 ) (674 ) Tax rate change - Tax Cuts and Jobs Act of 2017 8,106 — — Merger election 2,545 — — Stock based compensation (904 ) (255 ) — Other (636 ) (60 ) 391 Income tax expense $ 41,042 $ 26,184 $ 15,449
Schedule of Deferred Tax Assets and Liabilities	The components of the net deferred tax asset included in other assets in the accompanying consolidated statement of financial condition are as follows (dollars in thousands) : December 31 2017 2016 Deferred tax assets Allowance for loan and lease losses $ 7,274 $ 10,288 Net operating losses and credit carryforward 4,125 6,649 Accrued compensation 4,046 5,585 Tax basis difference on acquired assets 2,864 6,407 Other real estate owned 128 497 Unrealized losses on cash flow hedges 22 682 Estimated loss on acquired failed bank assets 2,646 6,327 Unrealized losses on securities available-for-sale 843 834 Other 1,125 538 Total deferred tax assets 23,073 37,807 Deferred tax liabilities Intangible asset basis difference $ (4,427 ) $ (7,163 ) Premises and equipment (1,598 ) (2,406 ) Other (1,472 ) (989 ) Total deferred tax liabilities (7,497 ) (10,558 ) Net Deferred Tax Asset $ 15,576 $ 27,249

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	Earnings per share have been computed based on the following weighted average number of common shares outstanding (dollars in thousands, except per share data) : Years Ended December 31 2017 2016 2015 Numerator: Net income per consolidated statements of income $ 46,574 $ 47,591 $ 28,423 Net income allocated to participating securities (1,222 ) (1,303 ) (783 ) Net income allocated to common stock $ 45,352 $ 46,288 $ 27,640 Basic earnings per share computation: Net income allocated to common stock $ 45,352 $ 46,288 $ 27,640 Weighted average common shares outstanding, including shares considered participating securities 38,945,515 36,942,866 35,796,497 Less: Average participating securities (1,022,195 ) (1,011,338 ) (985,642 ) Weighted average shares 37,923,320 35,931,528 34,810,855 Basic earnings per share $ 1.20 $ 1.29 $ .79 Diluted earnings per share computation: Net income allocated to common stock $ 45,352 $ 46,288 $ 27,640 Weighted average common shares outstanding for basic earnings per share 37,923,320 35,931,528 34,810,855 Weighted average dilutive grants 71,337 102,115 1,231,864 Weighted average shares and dilutive potential common shares 37,994,657 36,033,643 36,042,719 Diluted earnings per share $ 1.19 $ 1.28 $ .77

Accumulated Other Comprehensi54

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The components of AOCI and changes in those components are as follows (dollars in thousands) : Investment Securities Available-for-Sale Held-to-Maturity Securities Transferred from Available-for-Sale Cash Flow Hedges (Effective Portion) Total Balance, December 31, 2014 $ 4,210 $ — $ (290 ) $ 3,920 Other comprehensive loss before income taxes: Net change in unrealized losses (6,955 ) — (2,294 ) (9,249 ) Amounts reclassified for net (gains) losses realized and included in earnings (354 ) — 546 192 Income tax benefit (2,827 ) — (676 ) (3,503 ) Balance, December 31, 2015 $ (272 ) $ — $ (1,362 ) $ (1,634 ) Other comprehensive loss before income taxes: Net change in unrealized losses (1,196 ) — (714 ) (1,910 ) Amounts reclassified for net (gains) losses realized and included in earnings (489 ) — 1,171 682 Transfer of net unrealized loss from available-for-sale to held-to-maturity 172 (172 ) — — Amortization of net unrealized losses on securities transferred to-held-to-maturity — (3 ) — (3 ) Income tax (benefit) expense (585 ) — 177 (408 ) Balance, December 31, 2016 $ (1,200 ) $ (175 ) $ (1,082 ) $ (2,457 ) Other comprehensive loss before income taxes: Net change in unrealized (losses) gains (2,874 ) — 58 (2,816 ) Amounts reclassified for net losses realized and included in earnings 1,453 — 1,618 3,071 Amortization of net unrealized losses on securities transferred to held-to-maturity — 196 — 196 Adoption of ASU 2018-02 (442 ) — (11 ) (453 ) Income tax (benefit) expense (540 ) — 648 108 Balance, December 31, 2017 $ (2,523 ) $ 21 $ (65 ) $ (2,567 )
Reclassifications out of Accumulated Other Comprehensive Income	Reclassifications from AOCI into income for the periods presented are as follows (dollars in thousands) : December 31 Reclassifications from AOCI into income and affected line items on Consolidated Statements of Income 2017 2016 2015 Investment securities available-for-sale (Loss) gain on sale of investment securities $ (1,453 ) $ 489 $ 354 Income tax benefit (expense) 558 (189 ) (137 ) Net income $ (895 ) $ 300 $ 217 Cash flow hedges (effective portion) Interest expense on deposits $ (1,618 ) $ (1,171 ) $ (546 ) Income tax benefit 621 453 211 Net income $ (997 ) $ (718 ) $ (335 )

Condensed Financial Informati55

Condensed Financial Information of State Bank Financial Corporation (Parent Company Only Financial Statements) (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Schedule of Condensed Balance Sheet	Condensed Statements of Financial Condition (Dollars in thousands) December 31 2017 2016 Assets Cash and due from banks $ 55,099 $ 79,129 Securities available-for-sale 1,515 1,546 Securities held-to-maturity 10,161 10,259 Investment in subsidiary 574,769 550,346 Other assets 939 8,082 Total assets $ 642,483 $ 649,362 Liabilities Other liabilities $ 932 $ 35,729 Total liabilities 932 35,729 Shareholders' equity 641,551 613,633 Total liabilities and shareholders' equity $ 642,483 $ 649,362
Schedule of Condensed Income Statement	Condensed Statements of Income (Dollars in thousands) Years Ended December 31 2017 2016 2015 Interest income: Interest income $ 934 $ 940 $ 57 Net interest income 934 940 57 Noninterest income: Dividends from subsidiary 24,400 58,000 17,900 Other income 416 243 3,125 Total noninterest income 24,816 58,243 21,025 Noninterest expense: Salaries and employee benefits 1,425 2,246 7,537 Other noninterest expense 1,807 1,485 4,685 Total noninterest expense 3,232 3,731 12,222 Income before income tax and equity in undistributed net income of subsidiary 22,518 55,452 8,860 Income tax benefit (374 ) (1,306 ) (3,413 ) Income before equity in undistributed net income of subsidiary 22,892 56,758 12,273 Equity in earnings of subsidiary greater than (less than) dividends received 23,682 (9,167 ) 16,150 Net income $ 46,574 $ 47,591 $ 28,423
Schedule of Condensed Cash Flow Statement	Condensed Statements of Cash Flows (Dollars in thousands) Years Ended December 31 2017 2016 2015 Cash flows from operating activities: Net income $ 46,574 $ 47,591 $ 28,423 Adjustments to reconcile net earnings to net cash provided by operating activities: Undistributed earnings of subsidiary (greater than) less than dividends received (23,682 ) 9,167 (16,150 ) Share-based compensation expense 3,791 3,889 3,595 Other, net 6,622 (2,771 ) (2,059 ) Net cash provided by operating activities 33,305 57,876 13,809 Cash flows from investing activities: Cash consideration paid, net of cash received for bank acquisitions (34,171 ) (3,685 ) (25,884 ) Purchase of investment securities available-for-sale — — (11,758 ) Other (39 ) — — Net cash used in investing activities (34,210 ) (3,685 ) (37,642 ) Cash flows from financing activities: Issuance of common stock 1 200 547 Repurchase of common stock — (5,128 ) — Restricted stock activity (1,312 ) (116 ) (27 ) Dividends paid (21,814 ) (20,681 ) (11,631 ) Net cash used in financing activities (23,125 ) (25,725 ) (11,111 ) Net (decrease) increase in cash and cash equivalents (24,030 ) 28,466 (34,944 ) Cash and cash equivalents, beginning 79,129 50,663 85,607 Cash and cash equivalents, ending $ 55,099 $ 79,129 $ 50,663

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2017
Real Estate [Abstract]
Other Real Estate Owned Rollforward	December 31 Other real estate owned 2017 2016 Construction, land development, and other land $ 645 $ 2,393 Commercial and farmland real estate 153 6,960 Residential real estate 97 1,544 Total other real estate owned $ 895 $ 10,897 December 31 Other real estate owned 2017 2016 Organic OREO $ 153 $ 282 Purchased Credit Impaired OREO 742 10,615 Total other real estate owned $ 895 $ 10,897

Nature of Business and Summar57

Nature of Business and Summary of Significant Accounting Policies (Details)	12 Months Ended	89 Months Ended
	Dec. 31, 2017USD ($)metro_servicing_areabranch	Dec. 31, 2016USD ($)acquisition	Jul. 24, 2009USD ($)
Accounting Policies [Abstract]
Additional capital	$ 413,583,000	$ 409,736,000	$ 292,100,000
Number of acquisitions | acquisition		17
Total assets acquired	6,000,000,000
Deposits from acquisitions	$ 5,200,000,000
Number of branches | branch	32
Impaired loans, minimum amount to be evaluated on loan by loan basis for impairment	$ 500,000
Core deposit intangibles and other identifiable intangible assets, estimated useful lives	10 years
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life	39 years
Furniture Fixtures and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Furniture Fixtures and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	15 years
Georgia
Property, Plant and Equipment [Line Items]
Number of largest MSAs | metro_servicing_area	7
Number of MSAs company operates in | metro_servicing_area	8

Nature of Business and Summar58

Nature of Business and Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
New Accounting Pronouncement, Early Adoption [Line Items]
Adoption of ASU 2018-02	$ 0
Retained Earnings
New Accounting Pronouncement, Early Adoption [Line Items]
Adoption of ASU 2018-02	453
Accumulated Other Comprehensive Income (Loss)
New Accounting Pronouncement, Early Adoption [Line Items]
Adoption of ASU 2018-02	(453)
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Retained Earnings
New Accounting Pronouncement, Early Adoption [Line Items]
Adoption of ASU 2018-02	453
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Income (Loss)
New Accounting Pronouncement, Early Adoption [Line Items]
Adoption of ASU 2018-02	$ (453)

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) $ / shares in Units, $ in Thousands	Sep. 30, 2017USD ($)$ / shares	Dec. 31, 2016USD ($)$ / shares	Jan. 01, 2015USD ($)$ / shares	Feb. 24, 2017USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2017USD ($)	Sep. 29, 2017USD ($)	Dec. 30, 2016USD ($)	Oct. 22, 2015USD ($)	Feb. 26, 2015USD ($)
Business Acquisition [Line Items]
Goodwill		$ 77,084			$ 36,357	$ 84,564
AloStar Bank of Commerce
Business Acquisition [Line Items]
Conversion price per share (in dollars per share) | $ / shares	$ 24.26
Total consideration paid	$ 194,969
Cash consideration paid	194,969
Goodwill	7,088						$ 0
NBG Bancorp, Inc.
Business Acquisition [Line Items]
Conversion price per share (in dollars per share) | $ / shares		$ 45.45
Right to convert to State Bank shares, conversion ratio		2.1642
Equity interests acquired in exchange for cash (as a percent)		50.00%
Equity interests acquired in exchange for common stock (as a percent)		50.00%
Total consideration paid		$ 77,863		$ 77,900
Cash consideration paid		34,171		34,200
Common stock issued as part of consideration paid		43,692		$ 43,700
Goodwill		$ 36,587						$ 0
S Bankshares, Inc.
Business Acquisition [Line Items]
Conversion price per share (in dollars per share) | $ / shares		$ 56.70
Right to convert to State Bank shares, conversion ratio		2.7444
Equity interests acquired in exchange for cash (as a percent)		40.00%
Equity interests acquired in exchange for common stock (as a percent)		60.00%
Total consideration paid		$ 12,624
Cash consideration paid		4,281
Common stock issued as part of consideration paid		8,343
Goodwill		4,140						$ 0
Patriot Capital Corporation
Business Acquisition [Line Items]
Goodwill									$ 5,300
Other intangibles acquired									$ 2,100
Boyett Agency, LLC
Business Acquisition [Line Items]
Goodwill										$ 539
Other intangibles acquired										$ 319
First Bank
Business Acquisition [Line Items]
Conversion price per share (in dollars per share) | $ / shares			$ 8.85
Right to convert to State Bank shares, conversion ratio			0.794
Georgia-Carolina Bancshares, Inc.
Business Acquisition [Line Items]
Total consideration paid			$ 88,873
Cash consideration paid			31,831
Common stock issued as part of consideration paid			57,042
Goodwill			0
Merger related costs					$ 1,700
As Recorded by the Company
Business Acquisition [Line Items]
Goodwill			19,904
Purchased Non-Credit Impaired Loans | AloStar Bank of Commerce
Business Acquisition [Line Items]
Purchased non-credit impaired loans acquired	641,000
Purchased non-credit impaired loans acquired, contractual balance	707,000
Purchased non-credit impaired loans acquired, estimated uncollectible	$ 9,300
Purchased Non-Credit Impaired Loans | NBG Bancorp, Inc.
Business Acquisition [Line Items]
Purchased non-credit impaired loans acquired		317,900
Purchased non-credit impaired loans acquired, contractual balance		350,000
Purchased non-credit impaired loans acquired, estimated uncollectible		4,400
Purchased Non-Credit Impaired Loans | S Bankshares, Inc.
Business Acquisition [Line Items]
Purchased non-credit impaired loans acquired		67,300
Purchased non-credit impaired loans acquired, contractual balance		77,000
Purchased non-credit impaired loans acquired, estimated uncollectible		$ 1,300
Purchased Non-Credit Impaired Loans | Georgia-Carolina Bancshares, Inc.
Business Acquisition [Line Items]
Purchased non-credit impaired loans acquired			292,400
Purchased non-credit impaired loans acquired, contractual balance			355,000
Purchased non-credit impaired loans acquired, estimated uncollectible			$ 6,400

Acquisitions (Assets Acquired a

Acquisitions (Assets Acquired and Liabilities Assumed - AloStar Bank of Commerce) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2017	Sep. 29, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Total assets acquired		$ 6,000,000
Liabilities
Goodwill		$ 84,564		$ 77,084	$ 36,357
AloStar Bank of Commerce
Assets
Cash and cash equivalents	$ 91,571		$ 91,571
Investment securities available-for-sale	76,241		76,436
Loans, net	718,556		728,319
Core deposit intangible	856		0
Premises and equipment, net	507		507
Other assets	13,663		11,430
Total assets acquired	901,394		908,263
Liabilities
Noninterest-bearing	102,653		102,653
Interest-bearing	602,948		603,069
Total deposits	705,601		705,722
Other liabilities	7,912		7,912
Total liabilities assumed	713,513		713,634
Net identifiable assets acquired over liabilities assumed	187,881		194,629
Goodwill	7,088		0
Net assets acquired over liabilities assumed	194,969		$ 194,629
Assets
Cash and cash equivalents	0
Investment securities available-for-sale	(195)
Loans, net	(9,763)
Core deposit intangible	856
Premises and equipment, net	0
Other assets	2,233
Total assets acquired	(6,869)
Liabilities
Noninterest-bearing	0
Interest-bearing	(121)
Total deposits	(121)
Other liabilities	0
Total liabilities assumed	(121)
Net identifiable assets acquired over liabilities assumed	(6,748)
Goodwill	7,088
Net assets acquired over liabilities assumed	340
Consideration:
Cash exchanged for shares	194,969
Fair value of total consideration transferred	$ 194,969

Acquisitions (Assets Acquired61

Acquisitions (Assets Acquired and Liabilities Assumed - NBG Bancorp, Inc.) (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2016	Feb. 24, 2017	Dec. 31, 2017	Dec. 30, 2016	Dec. 31, 2015
Assets
Total assets acquired			$ 6,000,000
Liabilities
Goodwill	$ 77,084		$ 84,564		$ 36,357
NBG Bancorp, Inc.
Assets
Cash and cash equivalents	6,988			$ 38,146
Investment securities available-for-sale	5,934			5,974
Loans, net	344,996			348,641
Loans held-for-sale	694			694
Other real estate owned	64			69
Core deposit intangible	3,740			0
Premises and equipment, net	7,308			7,943
Bank-owned life insurance	1,499			1,499
Other assets	6,818			6,542
Total assets acquired	378,041			409,508
Liabilities
Noninterest-bearing	58,161			58,161
Interest-bearing	230,323			261,034
Total deposits	288,484			319,195
FHLB advances	46,214			46,354
Other liabilities	2,067			2,067
Total liabilities assumed	336,765			367,616
Net identifiable assets acquired over liabilities assumed	41,276			41,892
Goodwill	36,587			0
Net assets acquired over liabilities assumed	77,863			$ 41,892
Fair Value Adjustments
Cash and cash equivalents	(31,158)
Investment securities available-for-sale	(40)
Loans, net	(3,645)
Loans held-for-sale	0
Other real estate owned	(5)
Core deposit intangible	3,740
Premises and equipment, net	(635)
Bank-owned life insurance	0
Other assets	276
Total assets acquired	(31,467)
Noninterest-bearing	0
Interest-bearing	(30,711)
Total deposits	(30,711)
FHLB advances	(140)
Other liabilities	0
Total liabilities assumed	(30,851)
Net identifiable assets acquired over liabilities assumed	(616)
Goodwill	36,587
Net assets acquired over liabilities assumed	$ 35,971
Consideration:
State Bank Financial Corporation common shares issued	1,626,648
Purchase price per share of the Company's common stock (in dollars per share)	$ 26.86
Company common stock issued	$ 43,692	$ 43,700
Cash exchanged for shares	34,171	34,200
Fair value of total consideration transferred	$ 77,863	$ 77,900

Acquisitions (Assets Acquired62

Acquisitions (Assets Acquired and Liabilities Assumed - S Bankshares, Inc.) (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2016	Dec. 31, 2017	Dec. 30, 2016	Dec. 31, 2015
Assets
Total assets acquired		$ 6,000,000
Liabilities
Goodwill	$ 77,084	$ 84,564		$ 36,357
S Bankshares, Inc.
Assets
Cash and cash equivalents	954		$ 954
Investment securities available-for-sale	13,726		13,814
Loans, net	79,039		81,383
Other real estate owned	946		1,278
Core deposit intangible	1,010		0
Premises and equipment, net	3,552		3,132
Bank-owned life insurance	3,124		3,124
Other assets	3,766		2,636
Total assets acquired	106,117		106,321
Liabilities
Noninterest-bearing	16,620		16,620
Interest-bearing	77,158		76,664
Total deposits	93,778		93,284
Federal funds purchased and securities sold under repurchase agreements	1,951		1,951
FHLB advances	800		800
Other liabilities	1,104		1,104
Total liabilities assumed	97,633		97,139
Net identifiable assets acquired over liabilities assumed	8,484		9,182
Goodwill	4,140		0
Net assets acquired over liabilities assumed	12,624		$ 9,182
Fair Value Adjustments
Cash and cash equivalents	0
Investment securities available-for-sale	(88)
Loans, net	(2,344)
Other real estate owned	(332)
Core deposit intangible	1,010
Premises and equipment, net	420
Bank-owned life insurance	0
Other assets	1,130
Total assets acquired	(204)
Noninterest-bearing	0
Interest-bearing	494
Total deposits	494
Federal funds purchased and securities sold under repurchase agreements	0
FHLB advances	0
Other liabilities	0
Total liabilities assumed	494
Net identifiable assets acquired over liabilities assumed	(698)
Goodwill	4,140
Net assets acquired over liabilities assumed	$ 3,442
Consideration:
State Bank Financial Corporation common shares issued	310,596
Purchase price per share of the Company's common stock (in dollars per share)	$ 26.86
Company common stock issued	$ 8,343
Cash exchanged for shares	4,281
Fair value of total consideration transferred	$ 12,624

Acquisitions (Assets Acquired63

Acquisitions (Assets Acquired and Liabilities Assumed - Georgia-Carolina Bancshares Inc.) (Details) - USD ($) $ / shares in Units, $ in Thousands	Jan. 01, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Total assets acquired		$ 6,000,000
Goodwill		$ 84,564	$ 77,084	$ 36,357
As Recorded by Georgia-Carolina Bancshares, Inc.
Business Acquisition [Line Items]
Cash and due from banks	$ 20,873
Investment securities	130,218
Loans, net	293,814
Loans held-for-sale	34,956
Other real estate owned	4,428
Core deposit intangible	0
Premises and equipment, net	9,175
Bank-owned life insurance	15,414
Other assets	9,122
Total assets acquired	518,000
Noninterest-bearing	80,888
Interest-bearing	335,889
Total deposits	416,777
Securities sold under repurchase agreements	27,588
Other liabilities	11,823
Total liabilities assumed	456,188
Net identifiable assets acquired over liabilities assumed	61,812
Goodwill	0
Net assets acquired over liabilities assumed	$ 61,812
State Bank Financial Corporation common shares issued	2,854,970
Purchase price per share of the Company's common stock (in dollars per share)	$ 19.98
Company common stock issued	$ 57,042
Cash exchanged for shares	31,831
Fair value of total consideration transferred	88,873
Fair Value Adjustments
Business Acquisition [Line Items]
Cash and due from banks	0
Investment securities	999
Loans, net	590
Loans held-for-sale	0
Other real estate owned	2,042
Core deposit intangible	6,710
Premises and equipment, net	2,803
Bank-owned life insurance	0
Other assets	(4,457)
Total assets acquired	8,687
Noninterest-bearing	0
Interest-bearing	878
Total deposits	878
Securities sold under repurchase agreements	0
Other liabilities	652
Total liabilities assumed	1,530
Net identifiable assets acquired over liabilities assumed	7,157
Goodwill	19,904
Net assets acquired over liabilities assumed	27,061
As Recorded by the Company
Business Acquisition [Line Items]
Cash and due from banks	20,873
Investment securities	131,217
Loans, net	294,404
Loans held-for-sale	34,956
Other real estate owned	6,470
Core deposit intangible	6,710
Premises and equipment, net	11,978
Bank-owned life insurance	15,414
Other assets	4,665
Total assets acquired	526,687
Noninterest-bearing	80,888
Interest-bearing	336,767
Total deposits	417,655
Securities sold under repurchase agreements	27,588
Other liabilities	12,475
Total liabilities assumed	457,718
Net identifiable assets acquired over liabilities assumed	68,969
Goodwill	19,904
Net assets acquired over liabilities assumed	$ 88,873

Acquisitions (Pro Forma Informa

Acquisitions (Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
AloStar Bank of Commerce
Pro Forma
Net interest income, Pro Forma	$ 227,257	$ 192,035	$ 190,497
Net income, Pro Forma	$ 58,259	$ 57,029	$ 38,003
Earnings Per Share [Abstract]
Earnings per share, basic (in dollars per share)	$ 1.50	$ 1.54	$ 1.06
Earnings per share, diluted (in dollars per share)	$ 1.49	$ 1.54	$ 1.03
NBG Bancorp, Inc.
Pro Forma
Net interest income, Pro Forma	$ 192,786	$ 173,583	$ 170,520
Net income, Pro Forma	$ 47,412	$ 49,639	$ 33,152
Earnings Per Share [Abstract]
Earnings per share, basic (in dollars per share)	$ 1.22	$ 1.29	$ 0.88
Earnings per share, diluted (in dollars per share)	$ 1.22	$ 1.28	$ 0.86
Georgia-Carolina Bancshares, Inc.
Pro Forma
Net interest income, Pro Forma			$ 150,677
Net income, Pro Forma			$ 30,153
Earnings Per Share [Abstract]
Earnings per share, basic (in dollars per share)			$ 0.78
Earnings per share, diluted (in dollars per share)			$ 0.75
S Bankshares, Inc.
Pro Forma
Net interest income, Pro Forma	$ 192,786	$ 161,450	$ 156,427
Net income, Pro Forma	$ 47,031	$ 49,325	$ 29,179
Earnings Per Share [Abstract]
Earnings per share, basic (in dollars per share)	$ 1.21	$ 1.32	$ 0.81
Earnings per share, diluted (in dollars per share)	$ 1.21	$ 1.32	$ 0.78

Acquisitions (Purchased Credit

Acquisitions (Purchased Credit Impaired Loans Acquired) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Jan. 01, 2015
AloStar Bank of Commerce
Business Acquisition [Line Items]
Contractually required principal and interest at acquisition	$ 108,308
Contractual cash flows not expected to be collected (nonaccretable difference)	(19,093)
Expected cash flows at acquisition	89,215
Accretable difference	(11,664)
Basis in acquired loans at acquisition - estimated fair value	$ 77,551
NBG Bancorp, Inc.
Business Acquisition [Line Items]
Contractually required principal and interest at acquisition		$ 33,584
Contractual cash flows not expected to be collected (nonaccretable difference)		(3,736)
Expected cash flows at acquisition		29,848
Accretable difference		(2,799)
Basis in acquired loans at acquisition - estimated fair value		27,049
S Bankshares, Inc.
Business Acquisition [Line Items]
Contractually required principal and interest at acquisition		15,966
Contractual cash flows not expected to be collected (nonaccretable difference)		(2,805)
Expected cash flows at acquisition		13,161
Accretable difference		(1,377)
Basis in acquired loans at acquisition - estimated fair value		$ 11,784
Georgia-Carolina Bancshares, Inc.
Business Acquisition [Line Items]
Contractually required principal and interest at acquisition			$ 3,060
Contractual cash flows not expected to be collected (nonaccretable difference)			(783)
Expected cash flows at acquisition			2,277
Accretable difference			(317)
Basis in acquired loans at acquisition - estimated fair value			$ 1,960

Investment Securities (Availabl

Investment Securities (Available-for-Sale Reconciliation) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 877,348	$ 849,135
Unrealized Gains	4,801	3,955
Unrealized Losses	8,179	5,912
Fair Value	873,970	847,178
U.S. Government securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	70,203	89,044
Unrealized Gains	0	70
Unrealized Losses	644	465
Fair Value	69,559	88,649
States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	300
Unrealized Gains	0	1
Unrealized Losses	0	0
Fair Value	0	301
Residential mortgage-backed securities — nonagency
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	115,639	151,519
Unrealized Gains	3,183	3,129
Unrealized Losses	112	639
Fair Value	118,710	154,009
Residential mortgage-backed securities — agency
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	582,845	533,479
Unrealized Gains	319	548
Unrealized Losses	7,315	4,725
Fair Value	575,849	529,302
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	108,661	74,793
Unrealized Gains	1,299	207
Unrealized Losses	108	83
Fair Value	$ 109,852	$ 74,917

Investment Securities (Held to

Investment Securities (Held to Maturity Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 32,852	$ 67,063
Unrealized Gains	499	386
Unrealized Losses	0	14
Fair Value	33,351	67,435
Asset-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	22,692	56,804
Unrealized Gains	259	295
Unrealized Losses	0	14
Fair Value	22,951	57,085
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	10,160	10,259
Unrealized Gains	240	91
Unrealized Losses	0	0
Fair Value	$ 10,400	$ 10,350

Investment Securities (Schedule

Investment Securities (Schedule of Contractual Maturities of Investment Securities Available for Sale) (Details) $ in Thousands	Dec. 31, 2017USD ($)
Schedule of Available-for-sale Securities [Line Items]
Due within one year, Amortized Cost	$ 24,121
Due from one year to five years, Amortized Cost	176,154
Due from five years to ten years, Amortized Cost	159,768
Due after Ten Years, Amortized Cost	517,305
Amortized Cost	877,348
Due within one year, Fair Value	24,130
Due from one year to five years, Fair Value	175,306
Due from five years to ten years, Fair Value	158,148
Due after ten years, Fair Value	516,386
Fair Value	873,970
U.S. Government securities
Schedule of Available-for-sale Securities [Line Items]
Due within one year, Amortized Cost	2,498
Due from one year to five years, Amortized Cost	62,730
Due from five years to ten years, Amortized Cost	4,975
Due after Ten Years, Amortized Cost	0
Amortized Cost	70,203
Due within one year, Fair Value	2,498
Due from one year to five years, Fair Value	62,091
Due from five years to ten years, Fair Value	4,970
Due after ten years, Fair Value	0
Fair Value	69,559
Residential mortgage-backed securities — nonagency
Schedule of Available-for-sale Securities [Line Items]
Due within one year, Amortized Cost	0
Due from one year to five years, Amortized Cost	0
Due from five years to ten years, Amortized Cost	0
Due after Ten Years, Amortized Cost	115,639
Amortized Cost	115,639
Due within one year, Fair Value	0
Due from one year to five years, Fair Value	0
Due from five years to ten years, Fair Value	0
Due after ten years, Fair Value	118,710
Fair Value	118,710
Residential mortgage-backed securities — agency
Schedule of Available-for-sale Securities [Line Items]
Due within one year, Amortized Cost	0
Due from one year to five years, Amortized Cost	42,269
Due from five years to ten years, Amortized Cost	140,793
Due after Ten Years, Amortized Cost	399,783
Amortized Cost	582,845
Due within one year, Fair Value	0
Due from one year to five years, Fair Value	41,677
Due from five years to ten years, Fair Value	138,607
Due after ten years, Fair Value	395,565
Fair Value	575,849
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Due within one year, Amortized Cost	21,623
Due from one year to five years, Amortized Cost	71,155
Due from five years to ten years, Amortized Cost	14,000
Due after Ten Years, Amortized Cost	1,883
Amortized Cost	108,661
Due within one year, Fair Value	21,632
Due from one year to five years, Fair Value	71,538
Due from five years to ten years, Fair Value	14,571
Due after ten years, Fair Value	2,111
Fair Value	$ 109,852

Investment Securities Investmen

Investment Securities Investment Securities (Held-to-maturity Security Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Held-to-maturity Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract]
1 Year or Less	$ 0
1-5 Years	0
5-10 Years	17,352
After 10 Years	15,500
Amortized Cost	32,852	$ 67,063
Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
1 Year or Less	0
1-5 Years	0
5-10 Years	17,686
After 10 Years	15,665
Total	33,351	67,435
Asset-backed securities
Held-to-maturity Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract]
1 Year or Less	0
1-5 Years	0
5-10 Years	7,192
After 10 Years	15,500
Amortized Cost	22,692	56,804
Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
1 Year or Less	0
1-5 Years	0
5-10 Years	7,286
After 10 Years	15,665
Total	22,951	57,085
Corporate securities
Held-to-maturity Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract]
1 Year or Less	0
1-5 Years	0
5-10 Years	10,160
After 10 Years	0
Amortized Cost	10,160	10,259
Held-to-maturity Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]
1 Year or Less	0
1-5 Years	0
5-10 Years	10,400
After 10 Years	0
Total	$ 10,400	$ 10,350

Investment Securities (Summary

Investment Securities (Summary of Gross Unrealized Losses and Fair Value of Investments with Unrealized Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 394,655	$ 526,795
Less than 12 Months, Unrealized Losses	3,023	5,271
12 Months or More, Fair Value	237,567	42,786
12 Months or More, Unrealized Losses	5,156	641
Total, Fair Value	632,222	569,581
Total, Unrealized Losses	8,179	5,912
U.S. Government securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	46,625	43,958
Less than 12 Months, Unrealized Losses	364	465
12 Months or More, Fair Value	20,436	0
12 Months or More, Unrealized Losses	280	0
Total, Fair Value	67,061	43,958
Total, Unrealized Losses	644	465
Residential mortgage-backed securities — nonagency
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	1,403	29,403
Less than 12 Months, Unrealized Losses	3	239
12 Months or More, Fair Value	6,269	23,991
12 Months or More, Unrealized Losses	109	400
Total, Fair Value	7,672	53,394
Total, Unrealized Losses	112	639
Residential mortgage-backed securities — agency
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	312,617	430,490
Less than 12 Months, Unrealized Losses	2,548	4,484
12 Months or More, Fair Value	210,862	18,795
12 Months or More, Unrealized Losses	4,767	241
Total, Fair Value	523,479	449,285
Total, Unrealized Losses	7,315	4,725
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	34,010	22,944
Less than 12 Months, Unrealized Losses	108	83
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Total, Fair Value	34,010	22,944
Total, Unrealized Losses	$ 108	$ 83

Investment Securities (Held-to-

Investment Securities (Held-to-maturity, Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	$ 0	$ 6,486
Less than 12 months, Unrealized Losses	0	14
12 months or more, Fair Value	0	0
12 months or more, Unrealized Losses	0	0
Total, Fair Value	0	6,486
Total, Unrealized Losses	0	14
Asset-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	0	6,486
Less than 12 months, Unrealized Losses	0	14
12 months or more, Fair Value	0	0
12 months or more, Unrealized Losses	0	0
Total, Fair Value	0	6,486
Total, Unrealized Losses	0	14
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	0	0
Less than 12 months, Unrealized Losses	0	0
12 months or more, Fair Value	0	0
12 months or more, Unrealized Losses	0	0
Total, Fair Value	0	0
Total, Unrealized Losses	$ 0	$ 0

Investment Securities (Gains an

Investment Securities (Gains and Losses on Investment Securities Available-for-Sale) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales and calls	$ 233,946	$ 113,589	$ 364,023
Gross gains on sales and calls	122	489	618
Gross losses on sales and calls	(1,575)	0	(264)
Net realized gains on sales and calls	$ (1,453)	$ 489	$ 354

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Millions	Dec. 31, 2017USD ($)investment_security	Dec. 31, 2016USD ($)
Investments, Debt and Equity Securities [Abstract]
Number of investments in unrealized loss position | investment_security	129
Available-for-sale securities pledged as collateral | $	$ 116.1	$ 368.3

Loans (Summary) (Details)

Loans (Summary) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 3,532,193	$ 2,814,572
Allowance for loan and lease losses	(28,750)	(26,598)	$ (29,075)	$ (28,638)
Loans, net	3,503,443	2,787,974
Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,706,995	1,592,826
Commercial Real Estate | Construction, land & land development
Loans and Leases Receivable Disclosure [Line Items]
Loans	451,993	567,763
Commercial Real Estate | Other commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,255,002	1,025,063
Residential Real Estate | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	333,086	343,398
Owner-occupied real estate | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	399,370	395,863
Commercial, Financial & Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	973,440	368,120
Leases
Loans and Leases Receivable Disclosure [Line Items]
Loans	52,396	71,724
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 66,906	$ 42,641

Loans (Organic) (Details)

Loans (Organic) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 3,532,193	$ 2,814,572
Allowance for loan and lease losses	(28,750)	(26,598)	$ (29,075)	$ (28,638)
Loans, net	3,503,443	2,787,974
Net deferred loan fees	9,300	7,000
Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,706,995	1,592,826
Commercial Real Estate | Construction, land & land development
Loans and Leases Receivable Disclosure [Line Items]
Loans	451,993	567,763
Commercial Real Estate | Other commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,255,002	1,025,063
Residential Real Estate | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	333,086	343,398
Owner-occupied real estate | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	399,370	395,863
Commercial, Financial & Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	973,440	368,120
Leases
Loans and Leases Receivable Disclosure [Line Items]
Loans	52,396	71,724
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	66,906	42,641
Organic Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,365,843	2,090,564
Allowance for loan and lease losses	(24,039)	(21,086)	(21,224)	(18,392)
Loans, net	2,341,804	2,069,478
Organic Loans | Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,362,134	1,254,808
Allowance for loan and lease losses	(13,037)	(11,767)	(13,607)	(13,134)
Organic Loans | Commercial Real Estate | Construction, land & land development
Loans and Leases Receivable Disclosure [Line Items]
Loans	412,540	500,018
Organic Loans | Commercial Real Estate | Other commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	949,594	754,790
Organic Loans | Residential Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses	(2,809)	(1,786)	(2,053)	(1,190)
Organic Loans | Residential Real Estate | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	196,225	144,295
Organic Loans | Owner-occupied real estate
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses	(2,075)	(2,239)	(1,920)	(1,928)
Organic Loans | Owner-occupied real estate | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	260,273	256,317
Organic Loans | Commercial, Financial & Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	430,205	327,381
Allowance for loan and lease losses	(4,535)	(4,093)	(2,509)	(1,770)
Organic Loans | Leases
Loans and Leases Receivable Disclosure [Line Items]
Loans	52,396	71,724
Allowance for loan and lease losses	(629)	(655)	(865)	(262)
Organic Loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	64,610	36,039
Allowance for loan and lease losses	$ (954)	$ (546)	$ (270)	$ (108)

Loans (Purchased Non-Credit Imp

Loans (Purchased Non-Credit Impaired) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 3,532,193	$ 2,814,572
Allowance for loan and lease losses	(28,750)	(26,598)	$ (29,075)	$ (28,638)
Loans, net	3,503,443	2,787,974
Net discounts	12,700	10,500
Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,706,995	1,592,826
Commercial Real Estate | Construction, land & land development
Loans and Leases Receivable Disclosure [Line Items]
Loans	451,993	567,763
Commercial Real Estate | Other commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,255,002	1,025,063
Residential Real Estate | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	333,086	343,398
Owner-occupied real estate | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	399,370	395,863
Commercial, Financial & Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	973,440	368,120
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	66,906	42,641
Purchased Non-Credit Impaired Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	990,736	563,362
Allowance for loan and lease losses	(995)	(439)	(53)	0
Loans, net	989,741	562,923
Purchased Non-Credit Impaired Loans | Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	244,568	260,739
Allowance for loan and lease losses	(230)	(88)	0	0
Purchased Non-Credit Impaired Loans | Commercial Real Estate | Construction, land & land development
Loans and Leases Receivable Disclosure [Line Items]
Loans	25,908	51,208
Purchased Non-Credit Impaired Loans | Commercial Real Estate | Other commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	218,660	209,531
Purchased Non-Credit Impaired Loans | Residential Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses	(664)	(72)	(53)	0
Purchased Non-Credit Impaired Loans | Residential Real Estate | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	96,529	144,596
Purchased Non-Credit Impaired Loans | Owner-occupied real estate
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses	(88)	(44)	0	0
Purchased Non-Credit Impaired Loans | Owner-occupied real estate | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	118,294	115,566
Purchased Non-Credit Impaired Loans | Commercial, Financial & Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	529,184	36,206
Allowance for loan and lease losses	(8)	(235)	0	0
Purchased Non-Credit Impaired Loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	2,161	6,255
Allowance for loan and lease losses	$ (5)	$ 0	$ 0	$ 0

Loans (Purchased Credit Impaire

Loans (Purchased Credit Impaired) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 3,532,193	$ 2,814,572
Allowance for loan and lease losses	(28,750)	(26,598)	$ (29,075)	$ (28,638)
Loans, net	3,503,443	2,787,974
Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,706,995	1,592,826
Commercial Real Estate | Construction, land & land development
Loans and Leases Receivable Disclosure [Line Items]
Loans	451,993	567,763
Commercial Real Estate | Other commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,255,002	1,025,063
Residential Real Estate | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	333,086	343,398
Owner-occupied real estate | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	399,370	395,863
Commercial, Financial & Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	973,440	368,120
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	66,906	42,641
Purchased Credit Impaired Loans
Loans and Leases Receivable Disclosure [Line Items]
Loans	175,614	160,646
Allowance for loan and lease losses	(3,716)	(5,073)	(7,798)	(10,246)
Loans, net	171,898	155,573
Purchased Credit Impaired Loans | Commercial Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	100,293	77,279
Allowance for loan and lease losses	(1,706)	(2,183)	(3,388)	(5,461)
Purchased Credit Impaired Loans | Commercial Real Estate | Construction, land & land development
Loans and Leases Receivable Disclosure [Line Items]
Loans	13,545	16,537
Purchased Credit Impaired Loans | Commercial Real Estate | Other commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	86,748	60,742
Purchased Credit Impaired Loans | Residential Real Estate
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses	(1,242)	(1,196)	(1,893)	(2,298)
Purchased Credit Impaired Loans | Residential Real Estate | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	40,332	54,507
Purchased Credit Impaired Loans | Owner-occupied real estate
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan and lease losses	(718)	(1,655)	(2,449)	(1,916)
Purchased Credit Impaired Loans | Owner-occupied real estate | Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	20,803	23,980
Purchased Credit Impaired Loans | Commercial, Financial & Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	14,051	4,533
Allowance for loan and lease losses	(42)	(38)	(60)	(567)
Purchased Credit Impaired Loans | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	135	347
Allowance for loan and lease losses	$ (8)	$ (1)	$ (8)	$ (4)

Loans (Changes in Carrying Valu

Loans (Changes in Carrying Value of Purchased Credit Impaired Loans) (Details) - Purchased Credit Impaired Loans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Changes in carrying value of Purchased Credit Impaired Loans [Roll Forward]
Balance, beginning of year	$ 155,573	$ 137,777
Accretion of fair value discounts	34,096	43,310
Fair value of acquired loans	77,551	40,133
Reductions in principal balances resulting from repayments, write-offs and foreclosures	(96,679)	(68,372)
Change in the allowance for loan and lease losses on purchased credit impaired loans	1,357	2,725
Balance, end of year	$ 171,898	$ 155,573

Loans (Change in Accretable Dis

Loans (Change in Accretable Discount) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance, beginning of year	$ 69,301	$ 86,100	$ 120,061
Additions from acquisitions	11,664	5,824	317
Accretion	(34,096)	(43,310)	(49,830)
Transfers to accretable discount (exit events), net	11,058	20,687	15,552
Balance, end of year	57,927	69,301	$ 86,100
Loans pledged as collateral	3,100,000	$ 2,500,000
Consumer mortgage loans secured by residential real estate in process of foreclosure	$ 49

Allowance for Loan and Lease 80

Allowance for Loan and Lease Losses (ALLL) (ALLL Rollforward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 26,598	$ 29,075	$ 28,638
Charge-offs	(4,418)	(6,174)	(12,494)
Recoveries	460	3,460	8,400
Net charge-offs	(3,958)	(2,714)	(4,094)
Provision for loan and lease losses before amount attributable to FDIC loss share agreements	6,110	237	4,531
Amount attributable to FDIC loss share agreements	0	0	(1,045)
Total provision for loan and lease losses charged to operations	6,110	237	3,486
(Recovery of) provision for loan and lease losses recorded through the FDIC loss share receivable	0	0	1,045
Balance, end of period	28,750	26,598	29,075
Organic Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	21,086	21,224	18,392
Charge-offs	(2,462)	(3,411)	(313)
Recoveries	373	223	288
Net charge-offs	(2,089)	(3,188)	(25)
Total provision for loan and lease losses charged to operations	5,042	3,050	2,857
Balance, end of period	24,039	21,086	21,224
Individually evaluated for impairment	99	149
Collectively evaluated for impairment	23,940	20,937
Loans individually evaluated for impairment	4,959	4,959
Loans collectively evaluated for impairment	2,360,884	2,085,605
Total Loans	2,365,843	2,090,564
Organic Loans | Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	11,767	13,607	13,134
Charge-offs	(933)	(2,122)	(3)
Recoveries	0	0	173
Total provision for loan and lease losses charged to operations	2,203	282	303
Balance, end of period	13,037	11,767	13,607
Individually evaluated for impairment	0	148
Collectively evaluated for impairment	13,037	11,619
Loans individually evaluated for impairment	3,822	4,950
Loans collectively evaluated for impairment	1,358,312	1,249,858
Total Loans	1,362,134	1,254,808
Organic Loans | Residential Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	1,786	2,053	1,190
Charge-offs	(61)	(53)	0
Recoveries	14	6	10
Total provision for loan and lease losses charged to operations	1,070	(220)	853
Balance, end of period	2,809	1,786	2,053
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	2,809	1,786
Loans individually evaluated for impairment	49	0
Loans collectively evaluated for impairment	196,176	144,295
Total Loans	196,225	144,295
Organic Loans | Owner- Occupied Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,239	1,920	1,928
Charge-offs	0	0	0
Recoveries	0	45	0
Total provision for loan and lease losses charged to operations	(164)	274	(8)
Balance, end of period	2,075	2,239	1,920
Individually evaluated for impairment	65	0
Collectively evaluated for impairment	2,010	2,239
Loans individually evaluated for impairment	808	0
Loans collectively evaluated for impairment	259,465	256,317
Total Loans	260,273	256,317
Organic Loans | Commercial, Financial & Agricultural
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	4,093	2,509	1,770
Charge-offs	(380)	(653)	(289)
Recoveries	133	154	98
Total provision for loan and lease losses charged to operations	689	2,083	930
Balance, end of period	4,535	4,093	2,509
Individually evaluated for impairment	34	1
Collectively evaluated for impairment	4,501	4,092
Loans individually evaluated for impairment	280	9
Loans collectively evaluated for impairment	429,925	327,372
Total Loans	430,205	327,381
Organic Loans | Leases
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	655	865	262
Charge-offs	(728)	(486)	0
Recoveries	182	11	0
Total provision for loan and lease losses charged to operations	520	265	603
Balance, end of period	629	655	865
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	629	655
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	52,396	71,724
Total Loans	52,396	71,724
Organic Loans | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	546	270	108
Charge-offs	(360)	(97)	(21)
Recoveries	44	7	7
Total provision for loan and lease losses charged to operations	724	366	176
Balance, end of period	954	546	270
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	954	546
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	64,610	36,039
Total Loans	64,610	36,039
Purchased Non-Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	439	53	0
Charge-offs	(670)	(223)	(48)
Recoveries	87	63	7
Net charge-offs	(583)	(160)	(41)
Total provision for loan and lease losses charged to operations	1,139	546	94
Balance, end of period	995	439	53
Individually evaluated for impairment	8	44
Collectively evaluated for impairment	987	395
Loans individually evaluated for impairment	4,774	2,411
Loans collectively evaluated for impairment	985,962	560,951
Total Loans	990,736	563,362
Purchased Non-Credit Impaired Loans | Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	88	0	0
Charge-offs	(50)	0	0
Recoveries	26	0	0
Total provision for loan and lease losses charged to operations	166	88	0
Balance, end of period	230	88	0
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	230	88
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	244,568	260,739
Total Loans	244,568	260,739
Purchased Non-Credit Impaired Loans | Residential Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	72	53	0
Charge-offs	(7)	(83)	(24)
Recoveries	11	45	1
Total provision for loan and lease losses charged to operations	588	57	76
Balance, end of period	664	72	53
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	664	72
Loans individually evaluated for impairment	19	157
Loans collectively evaluated for impairment	96,510	144,439
Total Loans	96,529	144,596
Purchased Non-Credit Impaired Loans | Owner- Occupied Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	44	0	0
Charge-offs	(80)	0	0
Recoveries	0	0	0
Total provision for loan and lease losses charged to operations	124	44	0
Balance, end of period	88	44	0
Individually evaluated for impairment	0	44
Collectively evaluated for impairment	88	0
Loans individually evaluated for impairment	3,264	1,686
Loans collectively evaluated for impairment	115,030	113,880
Total Loans	118,294	115,566
Purchased Non-Credit Impaired Loans | Commercial, Financial & Agricultural
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	235	0	0
Charge-offs	(524)	(137)	0
Recoveries	43	0	0
Total provision for loan and lease losses charged to operations	254	372	0
Balance, end of period	8	235	0
Individually evaluated for impairment	8	0
Collectively evaluated for impairment	0	235
Loans individually evaluated for impairment	1,491	568
Loans collectively evaluated for impairment	527,693	35,638
Total Loans	529,184	36,206
Purchased Non-Credit Impaired Loans | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	0	0	0
Charge-offs	(9)	(3)	(24)
Recoveries	7	18	6
Total provision for loan and lease losses charged to operations	7	(15)	18
Balance, end of period	5	0	0
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	5	0
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	2,161	6,255
Total Loans	2,161	6,255
Purchased Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	5,073	7,798	10,246
Charge-offs	(1,286)	(2,540)	(12,133)
Recoveries	0	3,174	8,105
Net charge-offs	(1,286)	634	(4,028)
Provision for loan and lease losses before amount attributable to FDIC loss share agreements	(71)	(3,359)	1,580
Amount attributable to FDIC loss share agreements	0	0	(1,045)
Total provision for loan and lease losses charged to operations	(71)	(3,359)	535
(Recovery of) provision for loan and lease losses recorded through the FDIC loss share receivable	0	0	1,045
Balance, end of period	3,716	5,073	7,798
Individually evaluated for impairment	1,798	2,389
Collectively evaluated for impairment	1,918	2,684
Loans individually evaluated for impairment	53,274	39,754
Loans collectively evaluated for impairment	122,340	120,892
Total Loans	175,614	160,646
Purchased Credit Impaired Loans | Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,183	3,388	5,461
Charge-offs	(446)	(936)	(7,251)
Recoveries	0	2,281	5,326
Provision for loan and lease losses before amount attributable to FDIC loss share agreements	(31)	(2,550)	(148)
Amount attributable to FDIC loss share agreements	0	0	(313)
Total provision for loan and lease losses charged to operations	(31)	(2,550)	(461)
(Recovery of) provision for loan and lease losses recorded through the FDIC loss share receivable	0	0	313
Balance, end of period	1,706	2,183	3,388
Individually evaluated for impairment	1,052	760
Collectively evaluated for impairment	654	1,423
Loans individually evaluated for impairment	38,444	29,387
Loans collectively evaluated for impairment	61,849	47,892
Total Loans	100,293	77,279
Purchased Credit Impaired Loans | Residential Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	1,196	1,893	2,298
Charge-offs	(140)	(977)	(1,441)
Recoveries	0	401	382
Provision for loan and lease losses before amount attributable to FDIC loss share agreements	186	(121)	654
Amount attributable to FDIC loss share agreements	0	0	(182)
Total provision for loan and lease losses charged to operations	186	(121)	472
(Recovery of) provision for loan and lease losses recorded through the FDIC loss share receivable	0	0	182
Balance, end of period	1,242	1,196	1,893
Individually evaluated for impairment	128	156
Collectively evaluated for impairment	1,114	1,040
Loans individually evaluated for impairment	3,029	1,897
Loans collectively evaluated for impairment	37,303	52,610
Total Loans	40,332	54,507
Purchased Credit Impaired Loans | Owner- Occupied Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	1,655	2,449	1,916
Charge-offs	(457)	(298)	(1,374)
Recoveries	0	207	1,120
Provision for loan and lease losses before amount attributable to FDIC loss share agreements	(480)	(703)	787
Amount attributable to FDIC loss share agreements	0	0	(402)
Total provision for loan and lease losses charged to operations	(480)	(703)	385
(Recovery of) provision for loan and lease losses recorded through the FDIC loss share receivable	0	0	402
Balance, end of period	718	1,655	2,449
Individually evaluated for impairment	586	1,471
Collectively evaluated for impairment	132	184
Loans individually evaluated for impairment	9,483	8,376
Loans collectively evaluated for impairment	11,320	15,604
Total Loans	20,803	23,980
Purchased Credit Impaired Loans | Commercial, Financial & Agricultural
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	38	60	567
Charge-offs	(238)	(273)	(1,929)
Recoveries	0	232	1,080
Provision for loan and lease losses before amount attributable to FDIC loss share agreements	242	19	342
Amount attributable to FDIC loss share agreements	0	0	(140)
Total provision for loan and lease losses charged to operations	242	19	202
(Recovery of) provision for loan and lease losses recorded through the FDIC loss share receivable	0	0	140
Balance, end of period	42	38	60
Individually evaluated for impairment	32	2
Collectively evaluated for impairment	10	36
Loans individually evaluated for impairment	2,318	86
Loans collectively evaluated for impairment	11,733	4,447
Total Loans	14,051	4,533
Purchased Credit Impaired Loans | Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	1	8	4
Charge-offs	(5)	(56)	(138)
Recoveries	0	53	197
Provision for loan and lease losses before amount attributable to FDIC loss share agreements	12	(4)	(55)
Amount attributable to FDIC loss share agreements	0	0	(8)
Total provision for loan and lease losses charged to operations	12	(4)	(63)
(Recovery of) provision for loan and lease losses recorded through the FDIC loss share receivable	0	0	8
Balance, end of period	8	1	$ 8
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	8	1
Loans individually evaluated for impairment	0	8
Loans collectively evaluated for impairment	135	339
Total Loans	$ 135	$ 347

Allowance for Loan and Lease 81

Allowance for Loan and Lease Losses (ALLL) (Impaired Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	$ 12,114	$ 6,539
Recorded Investment with No Related Allowance	10,294	4,627
Unpaid Principal Balance with Related Allowance	2,870	7,237
Recorded Investment with Related Allowance	2,748	4,988
Related Allowance	1,238	831
Unpaid Principal Balance	14,984	13,776
Recorded Investment	13,042	9,615
Average Recorded Investment	12,620	9,881	$ 6,592
Interest Income Recognized	9	27	185
Average recorded investment for troubled debt restructuring	2,800	6,000	3,500
Interest income recognized on troubled debt restructurings	8	24	82
Total commercial real estate
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	4,699	4,621
Recorded Investment with No Related Allowance	3,901	2,989
Unpaid Principal Balance with Related Allowance	113	4,277
Recorded Investment with Related Allowance	112	2,124
Related Allowance	56	201
Average Recorded Investment	5,602	5,989	4,460
Interest Income Recognized	8	0	131
Total commercial real estate | Construction, land & land development
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	82	4,565
Recorded Investment with No Related Allowance	79	2,933
Unpaid Principal Balance with Related Allowance	113	4,277
Recorded Investment with Related Allowance	112	2,124
Related Allowance	56	201
Average Recorded Investment	3,526	5,824	3,354
Interest Income Recognized	0	0	75
Total commercial real estate | Real estate
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	4,617	56
Recorded Investment with No Related Allowance	3,822	56
Unpaid Principal Balance with Related Allowance	0	0
Recorded Investment with Related Allowance	0	0
Related Allowance	0	0
Average Recorded Investment	2,076	165	1,106
Interest Income Recognized	8	0	56
Residential Real Estate
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	453	388
Recorded Investment with No Related Allowance	456	320
Unpaid Principal Balance with Related Allowance	1,452	891
Recorded Investment with Related Allowance	1,399	825
Related Allowance	699	413
Average Recorded Investment	1,218	1,641	818
Interest Income Recognized	0	0	18
Owner- Occupied Real Estate
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	4,172	193
Recorded Investment with No Related Allowance	4,015	188
Unpaid Principal Balance with Related Allowance	350	1,706
Recorded Investment with Related Allowance	335	1,687
Related Allowance	125	44
Average Recorded Investment	3,150	538	542
Interest Income Recognized	0	3	15
Commercial, Financial & Agricultural
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	2,739	1,335
Recorded Investment with No Related Allowance	1,882	1,128
Unpaid Principal Balance with Related Allowance	872	308
Recorded Investment with Related Allowance	821	298
Related Allowance	318	146
Average Recorded Investment	2,565	1,670	733
Interest Income Recognized	1	24	20
Consumer
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	51	2
Recorded Investment with No Related Allowance	40	2
Unpaid Principal Balance with Related Allowance	83	55
Recorded Investment with Related Allowance	81	54
Related Allowance	40	27
Average Recorded Investment	85	43	39
Interest Income Recognized	0	0	$ 1
SBA Loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 5,700	$ 3,000

Allowance for Loan and Lease 82

Allowance for Loan and Lease Losses (ALLL) (Nonaccrual Loans) (Details) - Organic and Purchased Non-Credit Impaired Loans - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Nonaccrual Loans	$ 12,477	$ 9,615
Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Nonaccrual Loans	3,448	5,113
Commercial Real Estate | Construction, land & land development
Financing Receivable, Impaired [Line Items]
Nonaccrual Loans	191	5,057
Commercial Real Estate | Real estate
Financing Receivable, Impaired [Line Items]
Nonaccrual Loans	3,257	56
Residential Real Estate
Financing Receivable, Impaired [Line Items]
Nonaccrual Loans	1,855	1,146
Owner- Occupied Real Estate
Financing Receivable, Impaired [Line Items]
Nonaccrual Loans	4,350	1,874
Commercial, Financial & Agricultural
Financing Receivable, Impaired [Line Items]
Nonaccrual Loans	2,703	1,426
Consumer
Financing Receivable, Impaired [Line Items]
Nonaccrual Loans	$ 121	$ 56

Allowance for Loan and Lease 83

Allowance for Loan and Lease Losses (ALLL) (Past Due Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 3,532,193	$ 2,814,572
Organic Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,761	1,287
Current	2,361,082	2,089,277
Total Loans	2,365,843	2,090,564
Loans greater than 90 Days and Accruing	0	0
Organic Loans | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	532	61
Current	1,361,602	1,254,747
Total Loans	1,362,134	1,254,808
Loans greater than 90 Days and Accruing	0	0
Organic Loans | Commercial Real Estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	532	61
Current	412,008	499,957
Total Loans	412,540	500,018
Loans greater than 90 Days and Accruing	0	0
Organic Loans | Commercial Real Estate | Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	949,594	754,790
Total Loans	949,594	754,790
Loans greater than 90 Days and Accruing	0	0
Organic Loans | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,960	275
Current	194,265	144,020
Total Loans	196,225	144,295
Loans greater than 90 Days and Accruing	0	0
Organic Loans | Owner- Occupied Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,187	40
Current	259,086	256,277
Total Loans	260,273	256,317
Loans greater than 90 Days and Accruing	0	0
Organic Loans | Commercial, Financial & Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	987	530
Current	429,218	326,851
Total Loans	430,205	327,381
Loans greater than 90 Days and Accruing	0	0
Organic Loans | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	52,396	71,724
Total Loans	52,396	71,724
Loans greater than 90 Days and Accruing	0	0
Organic Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	95	381
Current	64,515	35,658
Total Loans	64,610	36,039
Loans greater than 90 Days and Accruing	0	0
Purchased Non-Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,925	3,817
Current	986,811	559,545
Total Loans	990,736	563,362
Loans greater than 90 Days and Accruing	0	0
Purchased Non-Credit Impaired Loans | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	80	568
Current	244,488	260,171
Total Loans	244,568	260,739
Loans greater than 90 Days and Accruing	0	0
Purchased Non-Credit Impaired Loans | Commercial Real Estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	35	495
Current	25,873	50,713
Total Loans	25,908	51,208
Loans greater than 90 Days and Accruing	0	0
Purchased Non-Credit Impaired Loans | Commercial Real Estate | Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	45	73
Current	218,615	209,458
Total Loans	218,660	209,531
Loans greater than 90 Days and Accruing	0	0
Purchased Non-Credit Impaired Loans | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	663	439
Current	95,866	144,157
Total Loans	96,529	144,596
Loans greater than 90 Days and Accruing	0	0
Purchased Non-Credit Impaired Loans | Owner- Occupied Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,873	2,074
Current	116,421	113,492
Total Loans	118,294	115,566
Loans greater than 90 Days and Accruing	0	0
Purchased Non-Credit Impaired Loans | Commercial, Financial & Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,268	696
Current	527,916	35,510
Total Loans	529,184	36,206
Loans greater than 90 Days and Accruing	0	0
Purchased Non-Credit Impaired Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	41	40
Current	2,120	6,215
Total Loans	2,161	6,255
Loans greater than 90 Days and Accruing	0	0
Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	10,254	14,329
Current	165,360	146,317
Total Loans	175,614	160,646
Purchased Credit Impaired Loans | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,548	6,069
Current	94,745	71,210
Total Loans	100,293	77,279
Purchased Credit Impaired Loans | Commercial Real Estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,882	2,575
Current	11,663	13,962
Total Loans	13,545	16,537
Purchased Credit Impaired Loans | Commercial Real Estate | Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,666	3,494
Current	83,082	57,248
Total Loans	86,748	60,742
Purchased Credit Impaired Loans | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,395	3,997
Current	36,937	50,510
Total Loans	40,332	54,507
Purchased Credit Impaired Loans | Owner- Occupied Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	871	4,168
Current	19,932	19,812
Total Loans	20,803	23,980
Purchased Credit Impaired Loans | Commercial, Financial & Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	425	90
Current	13,626	4,443
Total Loans	14,051	4,533
Purchased Credit Impaired Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15	5
Current	120	342
Total Loans	135	347
30 - 89 Days Past Due | Organic Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,761	843
30 - 89 Days Past Due | Organic Loans | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	487	49
30 - 89 Days Past Due | Organic Loans | Commercial Real Estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	487	49
30 - 89 Days Past Due | Organic Loans | Commercial Real Estate | Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
30 - 89 Days Past Due | Organic Loans | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,868	157
30 - 89 Days Past Due | Organic Loans | Owner- Occupied Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	474	40
30 - 89 Days Past Due | Organic Loans | Commercial, Financial & Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	865	247
30 - 89 Days Past Due | Organic Loans | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
30 - 89 Days Past Due | Organic Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	67	350
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,523	1,355
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	35	512
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans | Commercial Real Estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	35	495
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans | Commercial Real Estate | Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	17
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	537	274
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans | Owner- Occupied Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	283	387
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans | Commercial, Financial & Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	640	144
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	28	38
30 - 89 Days Past Due | Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,169	2,968
30 - 89 Days Past Due | Purchased Credit Impaired Loans | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	364	1,068
30 - 89 Days Past Due | Purchased Credit Impaired Loans | Commercial Real Estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1	722
30 - 89 Days Past Due | Purchased Credit Impaired Loans | Commercial Real Estate | Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	363	346
30 - 89 Days Past Due | Purchased Credit Impaired Loans | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,519	1,210
30 - 89 Days Past Due | Purchased Credit Impaired Loans | Owner- Occupied Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	85	661
30 - 89 Days Past Due | Purchased Credit Impaired Loans | Commercial, Financial & Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	201	29
30 - 89 Days Past Due | Purchased Credit Impaired Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
90 Days or Greater Past Due | Organic Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,000	444
90 Days or Greater Past Due | Organic Loans | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	45	12
90 Days or Greater Past Due | Organic Loans | Commercial Real Estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	45	12
90 Days or Greater Past Due | Organic Loans | Commercial Real Estate | Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
90 Days or Greater Past Due | Organic Loans | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	92	118
90 Days or Greater Past Due | Organic Loans | Owner- Occupied Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	713	0
90 Days or Greater Past Due | Organic Loans | Commercial, Financial & Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	122	283
90 Days or Greater Past Due | Organic Loans | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
90 Days or Greater Past Due | Organic Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	28	31
90 Days or Greater Past Due | Purchased Non-Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,402	2,462
90 Days or Greater Past Due | Purchased Non-Credit Impaired Loans | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	45	56
90 Days or Greater Past Due | Purchased Non-Credit Impaired Loans | Commercial Real Estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
90 Days or Greater Past Due | Purchased Non-Credit Impaired Loans | Commercial Real Estate | Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	45	56
90 Days or Greater Past Due | Purchased Non-Credit Impaired Loans | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	126	165
90 Days or Greater Past Due | Purchased Non-Credit Impaired Loans | Owner- Occupied Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,590	1,687
90 Days or Greater Past Due | Purchased Non-Credit Impaired Loans | Commercial, Financial & Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	628	552
90 Days or Greater Past Due | Purchased Non-Credit Impaired Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13	2
90 Days or Greater Past Due | Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,085	11,361
90 Days or Greater Past Due | Purchased Credit Impaired Loans | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,184	5,001
90 Days or Greater Past Due | Purchased Credit Impaired Loans | Commercial Real Estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,881	1,853
90 Days or Greater Past Due | Purchased Credit Impaired Loans | Commercial Real Estate | Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,303	3,148
90 Days or Greater Past Due | Purchased Credit Impaired Loans | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,876	2,787
90 Days or Greater Past Due | Purchased Credit Impaired Loans | Owner- Occupied Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	786	3,507
90 Days or Greater Past Due | Purchased Credit Impaired Loans | Commercial, Financial & Agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	224	61
90 Days or Greater Past Due | Purchased Credit Impaired Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 15	$ 5

Allowance for Loan and Lease 84

Allowance for Loan and Lease Losses (ALLL) (Loan Risk Grades) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Organic Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	$ 2,365,843	$ 2,090,564
Organic Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	2,254,814	1,988,655
Organic Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	94,143	89,292
Organic Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	8,210	4,760
Organic Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	8,676	7,856
Organic Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	1
Purchased Non-Credit Impaired Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	990,736	563,362
Purchased Non-Credit Impaired Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	897,468	547,892
Purchased Non-Credit Impaired Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	66,478	9,311
Purchased Non-Credit Impaired Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	9,119	2,492
Purchased Non-Credit Impaired Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	17,607	3,667
Purchased Non-Credit Impaired Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	64	0
Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	175,614	160,646
Purchased Credit Impaired Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	100,928	81,019
Purchased Credit Impaired Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	24,361	29,918
Purchased Credit Impaired Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	6,086	8,266
Purchased Credit Impaired Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	44,126	41,171
Purchased Credit Impaired Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	113	272
Commercial Real Estate | Organic Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,362,134	1,254,808
Commercial Real Estate | Organic Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,291,526	1,189,655
Commercial Real Estate | Organic Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	61,168	59,999
Commercial Real Estate | Organic Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	5,451	97
Commercial Real Estate | Organic Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	3,989	5,057
Commercial Real Estate | Organic Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Commercial Real Estate | Organic Loans | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	412,540	500,018
Commercial Real Estate | Organic Loans | Construction, land & land development | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	371,358	470,686
Commercial Real Estate | Organic Loans | Construction, land & land development | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	38,939	24,178
Commercial Real Estate | Organic Loans | Construction, land & land development | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	2,086	97
Commercial Real Estate | Organic Loans | Construction, land & land development | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	157	5,057
Commercial Real Estate | Organic Loans | Construction, land & land development | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Commercial Real Estate | Organic Loans | Real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	949,594	754,790
Commercial Real Estate | Organic Loans | Real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	920,168	718,969
Commercial Real Estate | Organic Loans | Real estate | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	22,229	35,821
Commercial Real Estate | Organic Loans | Real estate | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	3,365	0
Commercial Real Estate | Organic Loans | Real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	3,832	0
Commercial Real Estate | Organic Loans | Real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Commercial Real Estate | Purchased Non-Credit Impaired Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	244,568	260,739
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	240,402	257,723
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,726	803
Commercial Real Estate | Purchased Non-Credit Impaired Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,825	2,157
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	615	56
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	25,908	51,208
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Construction, land & land development | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	25,486	51,208
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Construction, land & land development | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	385	0
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Construction, land & land development | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Construction, land & land development | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	37	0
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Construction, land & land development | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	218,660	209,531
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	214,916	206,515
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Real estate | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,341	803
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Real estate | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,825	2,157
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	578	56
Commercial Real Estate | Purchased Non-Credit Impaired Loans | Real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Commercial Real Estate | Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	100,293	77,279
Commercial Real Estate | Purchased Credit Impaired Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	69,887	41,221
Commercial Real Estate | Purchased Credit Impaired Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	12,807	14,253
Commercial Real Estate | Purchased Credit Impaired Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	3,334	4,186
Commercial Real Estate | Purchased Credit Impaired Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	14,265	17,619
Commercial Real Estate | Purchased Credit Impaired Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Commercial Real Estate | Purchased Credit Impaired Loans | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	13,545	16,537
Commercial Real Estate | Purchased Credit Impaired Loans | Construction, land & land development | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	6,677	7,798
Commercial Real Estate | Purchased Credit Impaired Loans | Construction, land & land development | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	809	1,150
Commercial Real Estate | Purchased Credit Impaired Loans | Construction, land & land development | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	973	1,416
Commercial Real Estate | Purchased Credit Impaired Loans | Construction, land & land development | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	5,086	6,173
Commercial Real Estate | Purchased Credit Impaired Loans | Construction, land & land development | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Commercial Real Estate | Purchased Credit Impaired Loans | Real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	86,748	60,742
Commercial Real Estate | Purchased Credit Impaired Loans | Real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	63,210	33,423
Commercial Real Estate | Purchased Credit Impaired Loans | Real estate | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	11,998	13,103
Commercial Real Estate | Purchased Credit Impaired Loans | Real estate | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	2,361	2,770
Commercial Real Estate | Purchased Credit Impaired Loans | Real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	9,179	11,446
Commercial Real Estate | Purchased Credit Impaired Loans | Real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Residential Real Estate | Organic Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	196,225	144,295
Residential Real Estate | Organic Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	188,918	139,393
Residential Real Estate | Organic Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	3,668	2,484
Residential Real Estate | Organic Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,488	460
Residential Real Estate | Organic Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	2,151	1,958
Residential Real Estate | Organic Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Residential Real Estate | Purchased Non-Credit Impaired Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	96,529	144,596
Residential Real Estate | Purchased Non-Credit Impaired Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	92,119	142,079
Residential Real Estate | Purchased Non-Credit Impaired Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	2,216	1,883
Residential Real Estate | Purchased Non-Credit Impaired Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	791	314
Residential Real Estate | Purchased Non-Credit Impaired Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,369	320
Residential Real Estate | Purchased Non-Credit Impaired Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	34	0
Residential Real Estate | Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	40,332	54,507
Residential Real Estate | Purchased Credit Impaired Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	21,706	28,628
Residential Real Estate | Purchased Credit Impaired Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	6,419	10,371
Residential Real Estate | Purchased Credit Impaired Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,590	2,840
Residential Real Estate | Purchased Credit Impaired Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	10,504	12,396
Residential Real Estate | Purchased Credit Impaired Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	113	272
Owner- Occupied Real Estate | Organic Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	260,273	256,317
Owner- Occupied Real Estate | Organic Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	240,987	237,753
Owner- Occupied Real Estate | Organic Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	16,891	14,967
Owner- Occupied Real Estate | Organic Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,067	3,577
Owner- Occupied Real Estate | Organic Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,328	20
Owner- Occupied Real Estate | Organic Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Owner- Occupied Real Estate | Purchased Non-Credit Impaired Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	118,294	115,566
Owner- Occupied Real Estate | Purchased Non-Credit Impaired Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	110,034	107,096
Owner- Occupied Real Estate | Purchased Non-Credit Impaired Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	3,227	6,310
Owner- Occupied Real Estate | Purchased Non-Credit Impaired Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,280	0
Owner- Occupied Real Estate | Purchased Non-Credit Impaired Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	3,753	2,160
Owner- Occupied Real Estate | Purchased Non-Credit Impaired Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Owner- Occupied Real Estate | Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	20,803	23,980
Owner- Occupied Real Estate | Purchased Credit Impaired Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	7,181	7,736
Owner- Occupied Real Estate | Purchased Credit Impaired Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	4,896	4,884
Owner- Occupied Real Estate | Purchased Credit Impaired Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	818	794
Owner- Occupied Real Estate | Purchased Credit Impaired Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	7,908	10,566
Owner- Occupied Real Estate | Purchased Credit Impaired Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Commercial, Financial & Agricultural | Organic Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	430,205	327,381
Commercial, Financial & Agricultural | Organic Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	421,114	325,161
Commercial, Financial & Agricultural | Organic Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	7,870	920
Commercial, Financial & Agricultural | Organic Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	123	624
Commercial, Financial & Agricultural | Organic Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,098	676
Commercial, Financial & Agricultural | Organic Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Commercial, Financial & Agricultural | Purchased Non-Credit Impaired Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	529,184	36,206
Commercial, Financial & Agricultural | Purchased Non-Credit Impaired Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	452,822	34,747
Commercial, Financial & Agricultural | Purchased Non-Credit Impaired Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	59,306	310
Commercial, Financial & Agricultural | Purchased Non-Credit Impaired Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	5,223	21
Commercial, Financial & Agricultural | Purchased Non-Credit Impaired Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	11,833	1,128
Commercial, Financial & Agricultural | Purchased Non-Credit Impaired Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Commercial, Financial & Agricultural | Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	14,051	4,533
Commercial, Financial & Agricultural | Purchased Credit Impaired Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	2,094	3,381
Commercial, Financial & Agricultural | Purchased Credit Impaired Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	211	310
Commercial, Financial & Agricultural | Purchased Credit Impaired Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	323	273
Commercial, Financial & Agricultural | Purchased Credit Impaired Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	11,423	569
Commercial, Financial & Agricultural | Purchased Credit Impaired Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Leases | Organic Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	52,396	71,724
Leases | Organic Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	47,908	60,849
Leases | Organic Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	4,488	10,875
Leases | Organic Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Leases | Organic Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Leases | Organic Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Consumer | Organic Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	64,610	36,039
Consumer | Organic Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	64,361	35,844
Consumer | Organic Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	58	47
Consumer | Organic Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	81	2
Consumer | Organic Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	110	145
Consumer | Organic Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	1
Consumer | Purchased Non-Credit Impaired Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	2,161	6,255
Consumer | Purchased Non-Credit Impaired Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	2,091	6,247
Consumer | Purchased Non-Credit Impaired Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	3	5
Consumer | Purchased Non-Credit Impaired Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Consumer | Purchased Non-Credit Impaired Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	37	3
Consumer | Purchased Non-Credit Impaired Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	30	0
Consumer | Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	135	347
Consumer | Purchased Credit Impaired Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	60	53
Consumer | Purchased Credit Impaired Loans | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	28	100
Consumer | Purchased Credit Impaired Loans | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	21	173
Consumer | Purchased Credit Impaired Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	26	21
Consumer | Purchased Credit Impaired Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	$ 0	$ 0

Allowance for Loan and Lease 85

Allowance for Loan and Lease Losses (ALLL) (Trouble Debt Restructurings) (Details) - Organic Loans $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)contract	Dec. 31, 2016USD ($)contract	Dec. 31, 2015USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	2	1	1
Pre-Modification Recorded Investment	$ 1,453	$ 4,168	$ 577
Post-Modification Recorded Investment	$ 1,453	$ 4,168	$ 577
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1	1	0
Pre-Modification Recorded Investment	$ 569	$ 4,168	$ 0
Post-Modification Recorded Investment	$ 569	$ 4,168	$ 0
Commercial Real Estate | Construction, land & land development
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	1	0
Pre-Modification Recorded Investment	$ 0	$ 4,168	$ 0
Post-Modification Recorded Investment	$ 0	$ 4,168	$ 0
Commercial Real Estate | Real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1	0	0
Pre-Modification Recorded Investment	$ 569	$ 0	$ 0
Post-Modification Recorded Investment	$ 569	$ 0	$ 0
Residential Real Estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	0	0
Pre-Modification Recorded Investment	$ 0	$ 0	$ 0
Post-Modification Recorded Investment	$ 0	$ 0	$ 0
Owner-occupied real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1	0	0
Pre-Modification Recorded Investment	$ 884	$ 0	$ 0
Post-Modification Recorded Investment	$ 884	$ 0	$ 0
Commercial, Financial & Agricultural
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	0	1
Pre-Modification Recorded Investment	$ 0	$ 0	$ 577
Post-Modification Recorded Investment	$ 0	$ 0	$ 577

Allowance for Loan and Lease 86

Allowance for Loan and Lease Losses (ALLL) (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017USD ($)contract	Dec. 31, 2016USD ($)contract	Dec. 31, 2015contract
Financing Receivable, Allowance for Credit Losses [Line Items]
Troubled debt restructuring | $	$ 1,500,000	$ 5,000,000
Allowance for loan losses on troubled debt restructurings | $	0	148,000
Unfunded commitment obligations to lend to customers that underwent troubled debt restructuring | $	$ 0	$ 0
Organic Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans modified under terms of a TDR (in contracts) | contract	2	1	1
Number of TDR's that subsequently defaulted within 12 month (in contracts) | contract	0	0	0
Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan term	5 years
Commercial Real Estate | Organic Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans modified under terms of a TDR (in contracts) | contract	1	1	0

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 73,080	$ 69,875
Accumulated depreciation	(21,286)	(17,819)
Premises and equipment, net	51,794	52,056
Depreciation expense	3,700	3,500	$ 3,800
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	14,849	14,632
Buildings and improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	38,742	37,856
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	18,939	16,961
Construction in progress
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 550	$ 426

Premises and Equipment (Future

Premises and Equipment (Future Minimum Lease Payments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment, and Leases [Abstract]
Operating leases, Lease term, up to	8 years
2,017	$ 4,627
2,018	3,347
2,019	3,261
2,020	2,980
2,021	3,049
Thereafter	3,518
Total	20,782
Future minimum payments due, future minimum sublease rentals	3,400
Rent expense, net	$ 3,500	$ 3,200	$ 3,100

Goodwill and Other Intangible89

Goodwill and Other Intangible Assets (Rollforward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Balance, beginning of year	$ 77,084	$ 36,357
Goodwill attributable to acquisitions	7,480	40,727
Balance, end of year	84,564	77,084	$ 36,357
Finite-lived Intangible Assets [Roll Forward]
Balance, beginning of year		21,660	16,910
Core deposit and other intangibles attributable to acquisitions	1,100	4,750
Accumulated amortization	(11,726)	(8,911)
Balance, end of year	11,034	12,749
Total goodwill and other intangibles	95,598	89,833
Amortization of intangibles	$ 2,815	$ 2,102	$ 1,804

Goodwill and Other Intangible90

Goodwill and Other Intangible Assets (Future Amortization Expense) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,018	$ 2,575
2,019	2,492
2,020	2,107
2,021	1,778
2,022	1,704
Thereafter	378
Total amortization expense	$ 11,034	$ 12,749

SBA Servicing Rights (Narrative

SBA Servicing Rights (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Transfers and Servicing [Abstract]
SBA loans sold, unpaid principal balance	$ 50,300	$ 53,700	$ 42,100
SBA loans sold, gains on sales	5,300	5,400	4,400
SBA servicing fee income	1,700	1,300	$ 978
SBA loans serviced	$ 185,600	$ 142,100

SBA Servicing Rights (Rollforwa

SBA Servicing Rights (Rollforward) (Details) - SBA Loans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of year	$ 3,477	$ 2,626	$ 1,516
Additions	1,213	1,323	1,070
Fair value adjustments	(621)	(472)	40
Balance, end of year	$ 4,069	$ 3,477	$ 2,626

SBA Servicing Rights (Fair Valu

SBA Servicing Rights (Fair Value Assumptions) (Details) - SBA Loans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Fair value	$ 4,069	$ 3,477	$ 2,626	$ 1,516
Weighted average discount rate	12.90%	12.80%
Decline in fair value due to a 100 basis point adverse change	$ (140)	$ (122)
Decline in fair value due to a 200 basis point adverse change	$ (272)	$ (236)
Prepayment speed	9.10%	8.00%
Decline in fair value due to a 10% adverse change	$ (141)	$ (108)
Decline in fair value due to a 20% adverse change	$ (275)	$ (210)
Weighted average remaining life (years)	6 years 8 months	7 years 1 month 4 days

SBA Servicing Rights (Past Due)

SBA Servicing Rights (Past Due) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Servicing asset	$ 349,787	$ 302,776
Net Charge-off	684	1,986
Serviced for others
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Servicing asset	185,557	142,069
Net Charge-off	0	0
Held-for-sale
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Servicing asset	10,420	16,356
Net Charge-off	0	0
Held-for-investment
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Servicing asset	153,810	144,351
Net Charge-off	684	1,986
30 - 89 Days Past Due
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Servicing asset	4,063	742
30 - 89 Days Past Due | Serviced for others
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Servicing asset	1,555	522
30 - 89 Days Past Due | Held-for-sale
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Servicing asset	0	0
30 - 89 Days Past Due | Held-for-investment
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Servicing asset	2,508	220
90 Days or Greater Past Due
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Servicing asset	6,627	5,580
90 Days or Greater Past Due | Serviced for others
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Servicing asset	0	0
90 Days or Greater Past Due | Held-for-sale
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Servicing asset	0	0
90 Days or Greater Past Due | Held-for-investment
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Servicing asset	$ 6,627	$ 5,580

FDIC Receivable for Loss Shar95

FDIC Receivable for Loss Share Agreements (Calculation of Loss) (Details) $ in Thousands	May 21, 2015acquisition	Dec. 31, 2015USD ($)
FDIC Receivable for Loss Sharing Agreements [Abstract]
Number of FDIC assisted acquisitions | acquisition	12
Cash paid to the FDIC to settle loss share agreements		$ (3,100)
FDIC loss share receivable		(16,959)
FDIC clawback payable		5,511
Loss on termination of FDIC loss share		(14,548)
Net amortization of FDIC receivable for loss share agreements during the period		(1,940)
Amortization of FDIC receivable for loss share agreements		$ (16,488)

FDIC Receivable for Loss Shar96

FDIC Receivable for Loss Share Agreements (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
FDIC Indemnification Asset [Roll Forward]
Balance, beginning of year	$ 22,320
Provision for loan and lease losses attributable to FDIC for loss share agreements	1,045
Wires sent (received)	1,784
Net recoveries	(6,627)
Amortization	(1,940)
External expenses qualifying under loss share agreements	377
Termination of FDIC loss share	(16,959)
Balance, end of year	$ 0

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deposits [Abstract]
Noninterest-bearing demand deposits	$ 1,191,106	$ 984,419
Interest-bearing transaction accounts	688,150	664,350
Savings and money market deposits	1,626,238	1,292,867
Time deposits less than $250,000	560,529	388,164
Time deposits $250,000 or greater	154,604	78,685
Brokered and wholesale time deposits	22,508	22,680
Total deposits	4,243,135	3,431,165
Overdrawn deposit accounts reclassified as loans	393	390
Maturities of Time Deposits [Abstract]
2,018	576,143
2,019	96,001
2,020	47,314
2,021	10,776
2,022	7,407
Total time, brokered, and wholesale deposits	737,641
Balance
Total brokered deposits	$ 18,200	$ 14,300

Securities Sold Under Repurch98

Securities Sold Under Repurchase Agreements (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Securities Sold Under Repurchase Agreements [Abstract]
Federal funds purchased and securities sold under agreements to repurchase	$ 25.2	$ 25.7
Weighted average rate of outstanding agreements (as a percent)	0.12%
Federal funds purchased assumed through acquisition	$ 0	$ 2
Federal funds purchased, interest rate (as a percent)		1.25%

Other Borrowings (Details)

Other Borrowings (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Notes Payable [Abstract]
Notes payable	$ 398,000	$ 398,000
FHLB Borrowings	$ 0	$ 47,000,000

Derivative Instruments and H100

Derivative Instruments and Hedging Activities (Balance Sheet Disclosures) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Interest Rate Products
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 2,011	$ 1,793
Liability derivatives	116	726
Interest Rate Products | Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	2,011	1,774
Interest Rate Products | Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	116	641
Interest Rate Products | Derivatives Not Designated as Hedging Instruments | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	19
Interest Rate Products | Derivatives Not Designated as Hedging Instruments | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	0	85
Mortgage Derivatives | Derivatives Not Designated as Hedging Instruments | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	616	1,362
Mortgage Derivatives | Derivatives Not Designated as Hedging Instruments | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 238	$ 459

Derivative Instruments and H101

Derivative Instruments and Hedging Activities (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)contractderivative	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Mar. 31, 2013USD ($)
Derivative [Line Items]
Amount to be reclassified from accumulated OCI into income during next twelve months, increase (decrease)	$ 88
Derivative instruments not designated as hedging instruments, gain (loss), net	(649)	$ 488	$ 166
Credit Risk Contract
Derivative [Line Items]
Credit risk derivative liabilities	0
Interest Rate Products
Derivative [Line Items]
Total Interest rate swaps and caps	36,300
Asset derivatives	2,011	1,793
Liability derivatives	116	726
Derivative instruments not designated as hedging instruments, gain (loss), net	78	(280)	347
Forward Contracts
Derivative [Line Items]
Total Interest rate swaps and caps	55,800
Derivative instruments not designated as hedging instruments, gain (loss), net	(603)	819	(34)
Designated as Hedging Instrument | Fair Value Hedging | Interest Income
Derivative [Line Items]
Gain (loss) recognized in income, ineffective portion	$ (65)	(118)	(492)
Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Number of interest rate derivatives held | derivative	84
Total Interest rate swaps and caps	$ 141,900
Designated as Hedging Instrument | Interest Rate Swap | Noninterest Income
Derivative [Line Items]
Total net (loss) gain recognized in income on fair value hedge ineffectiveness	(50)	183	(141)
Designated as Hedging Instrument | Interest Rate Swap | Interest Income
Derivative [Line Items]
Loss on derivative	912	1,800	2,300
Designated as Hedging Instrument | Interest Rate Swap | Fair Value Hedging | Noninterest Income
Derivative [Line Items]
Total net (loss) gain recognized in income on fair value hedge ineffectiveness	(50)	183	(141)
Amount of gain (loss) recognized in income on derivatives	$ 1,007	1,863	(956)
Designated as Hedging Instrument | Interest Rate Cap
Derivative [Line Items]
Total Interest rate swaps and caps				$ 200,000
Term of contract	5 years
Derivatives Not Designated as Hedging Instruments | Interest Rate Swap | Noninterest Income
Derivative [Line Items]
Amount of gain (loss) recognized in income on derivatives	$ (124)	(51)	$ (147)
Other Assets | Designated as Hedging Instrument | Interest Rate Products
Derivative [Line Items]
Asset derivatives	$ 2,011	1,774
Other Assets | Derivatives Not Designated as Hedging Instruments | Interest Rate Products
Derivative [Line Items]
Number of interest rate derivatives held | contract	0
Asset derivatives	$ 0	19
Other Assets | Derivatives Not Designated as Hedging Instruments | Mortgage Derivatives
Derivative [Line Items]
Asset derivatives	616	1,362
Other Liabilities | Designated as Hedging Instrument | Interest Rate Products
Derivative [Line Items]
Liability derivatives	116	641
Other Liabilities | Derivatives Not Designated as Hedging Instruments | Interest Rate Products
Derivative [Line Items]
Liability derivatives	0	85
Other Liabilities | Derivatives Not Designated as Hedging Instruments | Mortgage Derivatives
Derivative [Line Items]
Liability derivatives	$ 238	$ 459

Derivative Instruments and H102

Derivative Instruments and Hedging Activities (Fair Value Hedges) (Details) - Interest Rate Swap - Noninterest Income - Designated as Hedging Instrument - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Total net (loss) gain recognized in income on fair value hedge ineffectiveness	$ (50)	$ 183	$ (141)
Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in income on derivatives	1,007	1,863	(956)
Amount of (loss) gain recognized in income on hedged items	(1,057)	(1,680)	815
Total net (loss) gain recognized in income on fair value hedge ineffectiveness	$ (50)	$ 183	$ (141)

Derivative Instruments and H103

Derivative Instruments and Hedging Activities (Cash Flow Hedges) (Details) - Interest Rate Cap - Designated as Hedging Instrument - Cash Flow Hedging - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Total loss recognized in consolidated statements of comprehensive income	$ (1,560)	$ (1,885)	$ (2,840)
Other Comprehensive Income (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Total loss recognized in consolidated statements of comprehensive income	58	(714)	(2,294)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss reclassified from AOCI into income (effective portion)	$ 1,618	$ 1,171	$ 546

Derivative Instruments and H104

Derivative Instruments and Hedging Activities (Effect of Company's Mortgage Derivatives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives not designated as hedging instruments	$ (649)	$ 488	$ 166
Interest Rate Products
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives not designated as hedging instruments	78	(280)	347
Interest Rate Products | Noninterest income
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives not designated as hedging instruments	78	(280)	347
Forward Contracts
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives not designated as hedging instruments	(603)	819	(34)
Forward Contracts | Noninterest income
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives not designated as hedging instruments	(603)	819	(34)
Interest Rate Swap | Noninterest income
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives not designated as hedging instruments	$ (124)	$ (51)	$ (147)

Balance Sheet Offsetting (Offse

Balance Sheet Offsetting (Offsetting Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Repurchase agreements
Gross Amounts Recognized	$ 25,209	$ 25,722
Gross Amounts Offset on the Statement of Financial Condition	0	0
Net Amounts Presented on the Statement of Financial Condition	25,209	25,722
Gross Amounts Not Offset on the Statement of Financial Condition	0	0
Collateral Received/Posted	(25,209)	(25,722)
Net Amount	0	0
Total Offsetting Liabilities
Gross Amounts Recognized	25,325	26,448
Gross Amounts Offset on the Statement of Financial Condition	0	0
Net Amounts Presented on the Statement of Financial Condition	25,325	26,448
Gross Amounts Not Offset on the Statement of Financial Condition	(116)	(718)
Collateral Received/Posted	(25,209)	(25,722)
Net Amount	0	8
Interest rate swaps and caps
Offsetting Derivative Assets [Abstract]
Gross Amounts Recognized	2,011	1,793
Gross Amounts Offset in the Statement of Financial Condition	0	0
Net Amounts presented in the Statement of Financial Condition	2,011	1,793
Financial Instruments	(116)	(718)
Collateral Received/Posted	(1,895)	(1,075)
Net Amount	0	0
Offsetting Derivative Liabilities [Abstract]
Gross Amounts Recognized	116	726
Gross Amounts Offset in the Statement of Financial Condition	0	0
Net Amounts presented in the Statement of Financial Condition	116	726
Financial Instruments	(116)	(718)
Collateral Received/Posted	0	0
Net Amount	$ 0	$ 8

Stock Warrants (Details)

Stock Warrants (Details)	12 Months Ended
	Dec. 31, 2017$ / shares$ / warrantshares	Dec. 31, 2016$ / warrantshares
Class of Warrant or Right [Line Items]
Number of shares available to purchase by right holder per right	1
Contractual period	10 years
Class of Warrant or Right, Outstanding [Roll Forward]
Balance warrants (in shares)	133,912	172,745
Exercised (in shares)	(51,008)	(38,833)
Balance warrants (in shares)	82,904	133,912
Class of Warrant or Right, Weighted Average Exercise Price [Abstract]
Balance, Weighted Average Exercise Price (in dollars per warrant) | $ / warrant	9.37	9.52
Exercised, Weighted Average Exercise Price (in dollars per warrant) | $ / warrant	8.43	10.05
Balance, Weighted Average Exercise Price (in dollars per warrant) | $ / warrant	9.95	9.37
Minimum
Class of Warrant or Right [Line Items]
Strike prices of warrants (in dollars per share) | $ / shares	$ 5
Maximum
Class of Warrant or Right [Line Items]
Strike prices of warrants (in dollars per share) | $ / shares	$ 11.21

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)	3,160,000
Share-based compensation expense recognized	$ 3,791,000	$ 3,889,000	$ 3,595,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Contractual period	10 years
Share-based compensation expense recognized	$ 0	0	0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Share-based compensation expense recognized	$ 3,800,000	$ 3,900,000	$ 3,600,000
Awards issued in period (in shares)	146,254	85,575	664,706
Awards forfeited in period (in shares)	13,583
Tax benefit from compensation expense	$ 2,500,000	$ 1,800,000	$ 1,400,000
Unearned share-based compensation associated with restricted stock	$ 10,500,000
Compensation costs not yet recognized, weighted average recognition period (in years)	3 years 4 months 19 days
Performance-based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	10 years		10 years
Awards issued in period (in shares)			558,000
Awards forfeited in period (in shares)			92,000

Share-Based Compensation (Stock

Share-Based Compensation (Stock Option Activity) (Details) - Stock Options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Options, Outstanding options at beginning of year (in shares)	28,918
Exercised (in shares)	(28,918)
Number of Options, Outstanding options at end of year (in shares)	0	28,918
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Outstanding options, beginning of year (in usd per share)	$ 14.37
Weighted Average Exercise Price, Exercised (in usd per share)	14.37
Weighted Average Exercise Price, Outstanding options, end of year (in usd per share)	$ 0	$ 14.37
Weighted Average Remaining Contractual Life, Outstanding options, end of year		4 years 7 months 24 days
Aggregate Intrinsic Value, Exercised	$ 378
Aggregate Intrinsic Value, Outstanding options, end of year	$ 0	$ 361

Share-Based Compensation (Restr

Share-Based Compensation (Restricted Stock Awards Activity) (Details) - Restricted Stock - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares, Outstanding restricted stock beginning of year	1,006,052
Shares, Granted	146,254	85,575	664,706
Shares, Forfeited	(13,583)
Shares, Earned and Issued	(161,061)
Shares, Outstanding restricted stock at end of year	977,662	1,006,052
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant Date Fair Value, Outstanding restricted stock beginning of year (in usd per share)	$ 18.28
Weighted Average Grant Date Fair Value, Granted (in usd per share)	27.10	$ 19.81	$ 19.33
Weighted Average Grant Date Fair Value, Forfeited (in usd per share)	19.95
Weighted Average Grant Date Fair Value, Earned (in usd per share)	16.89
Weighted Average Grant Date Fair Value, Outstanding restricted stock at end of year (in usd per share)	$ 19.80	$ 18.28

Employee Benefit Plan (Details)

Employee Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Retirement Benefits [Abstract]
Employers matching contribution, annual vesting (as a percent)	100.00%	100.00%	100.00%
Maximum percent of eligible participant compensation	5.00%	5.00%	5.00%
Requisite service period	3 months
Compensation expense recognized	$ 2.6	$ 2.3	$ 2.2

Commitments and Contingent L111

Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Commitments [Line Items]
Commitments	$ 997,047	$ 681,566
Minimum
Commitments [Line Items]
Fixed rate loan commitments maturity	1 month
Maximum
Commitments [Line Items]
Fixed rate loan commitments maturity	13 years
Fixed | Commitments to extend credit
Commitments [Line Items]
Commitments	$ 65,117	63,166
Fixed | Letters of credit:
Commitments [Line Items]
Commitments	5,978	6,985
Variable | Commitments to extend credit
Commitments [Line Items]
Commitments	914,524	608,176
Variable | Letters of credit:
Commitments [Line Items]
Commitments	11,428	3,239
Obligation to repurchase or indemnify loans sold
Commitments [Line Items]
Recourse liability	$ 297	$ 306

Regulatory Matters (Minimum Req

Regulatory Matters (Minimum Required Regulatory Ratios) (Details)	Dec. 31, 2017	Dec. 31, 2016
Common Equity Tier 1 Capital (CET1)
Common Equity Tier 1 Capital (CET1), Minimum Requirement	4.50%	4.50%
Common Equity Tier 1 Capital (CET1), Well-capitalized	6.50%	6.50%
Tier 1 Capital
Tier 1 Capital, Minimum Requirement	6.00%	6.00%
Tier 1 Capital, Well-capitalized	8.00%	8.00%
Total Capital
Total Capital, Minimum Requirement	8.00%	8.00%
Total Capital, Well-capitalized	10.00%	10.00%
Tier 1 Leverage
Tier 1 Leverage, Minimum Requirement	4.00%	4.00%
Tier 1 Leverage, Well-capitalized	5.00%	5.00%

Regulatory Matters (Regulatory

Regulatory Matters (Regulatory Ratios) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 Capital, Actual Amount	$ 547,822	$ 526,282
CET1 Capital, Actual Ratio (as a percent)	12.61%	14.78%
CET1 Capital, Required Minimum Amount	$ 195,433	$ 160,258
Tier I Capital to Risk-Weighted Assets
Tier 1 Risk Based Capital to Risk-Weighted Assets, Amount	$ 547,822	$ 526,282
Tier 1 Risk Based Capital to Risk-Weighted Assets, Ratio (as a percent)	12.61%	14.78%
Tier 1 Risk Based Capital to Risk-Weighted Assets, Required for Capital Adequacy, Amount	$ 260,578	$ 213,678
Total Capital to Risk-Weighted Assets
Capital to Risk-Weighted Assets, Amount	$ 576,572	$ 552,880
Capital to Risk-Weighted Assets, Ratio (as a percent)	13.28%	15.52%
Capital to Risk-Weighted Assets, Required for Capital Adequacy, Amount	$ 347,437	$ 284,904
Tier I Capital to Average Assets
Tier 1 Leverage Capital to Average Assets, Amount	$ 547,822	$ 526,282
Tier 1 Leverage Capital to Average Assets, Ratio (as a percent)	11.24%	14.90%
Tier 1 Leverage Capital to Average Assets, Required for Capital Adequacy, Amount	$ 194,924	$ 141,273
State Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 Capital, Actual Amount	$ 481,135	$ 463,164
CET1 Capital, Actual Ratio (as a percent)	11.10%	13.06%
CET1 Capital, Required Minimum Amount	$ 194,972	$ 159,535
CET1 Capital, Required Well Capitalized Amount	281,626	230,440
Tier I Capital to Risk-Weighted Assets
Tier 1 Risk Based Capital to Risk-Weighted Assets, Amount	$ 481,135	$ 463,164
Tier 1 Risk Based Capital to Risk-Weighted Assets, Ratio (as a percent)	11.10%	13.06%
Tier 1 Risk Based Capital to Risk-Weighted Assets, Required for Capital Adequacy, Amount	$ 259,962	$ 212,714
Tier 1 Risk Based Capital to Risk-Weighted Assets, Required to be Well Capitalized, Amount	346,617	283,618
Total Capital to Risk-Weighted Assets
Capital to Risk-Weighted Assets, Amount	$ 509,885	$ 489,762
Capital to Risk-Weighted Assets, Ratio (as a percent)	11.77%	13.81%
Capital to Risk-Weighted Assets, Required for Capital Adequacy, Amount	$ 346,617	$ 283,618
Capital to Risk-Weighted Assets, Required to be Well Capitalized, Amount	433,271	354,523
Tier I Capital to Average Assets
Tier 1 Leverage Capital to Average Assets, Amount	$ 481,135	$ 463,164
Tier 1 Leverage Capital to Average Assets, Ratio (as a percent)	9.90%	13.18%
Tier 1 Leverage Capital to Average Assets, Required for Capital Adequacy, Amount	$ 194,429	$ 140,572
Tier 1 Leverage Capital to Average Assets, Required to be Well Capitalized, Amount	$ 243,037	$ 175,715

Regulatory Matters (Narrative)

Regulatory Matters (Narrative) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capacity to pay dividends without prior regulatory approval	$ 0
Cash and amounts due from depository institutions	17,438,000	$ 13,219,000
Cash required reserves, Federal Reserve Bank	29,600,000	16,200,000
Parent Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash and amounts due from depository institutions	$ 55,099,000	$ 79,129,000

Fair Value (Assets and Liabilit

Fair Value (Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	$ 873,970	$ 847,178
Measured on recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
SBA servicing rights	4,069	3,477
Total recurring assets at fair value	1,045,848	1,056,788
Derivative financial instruments, Liabilities	354	1,185
Measured on recurring basis | U.S. Government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	69,559	88,649
Measured on recurring basis | States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		301
Measured on recurring basis | Residential mortgage-backed securities — nonagency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	118,710	154,009
Measured on recurring basis | Residential mortgage-backed securities — agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	575,849	529,302
Measured on recurring basis | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	109,852	74,917
Measured on recurring basis | Hedged loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial Instruments, Assets	139,391	167,165
Measured on recurring basis | Mortgage loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	25,791	35,813
Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
SBA servicing rights	0	0
Total recurring assets at fair value	0	0
Derivative financial instruments, Liabilities	0	0
Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1) | U.S. Government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1) | States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		0
Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1) | Residential mortgage-backed securities — nonagency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1) | Residential mortgage-backed securities — agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1) | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1) | Hedged loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial Instruments, Assets	0	0
Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1) | Mortgage loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Measured on recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
SBA servicing rights	0	0
Total recurring assets at fair value	1,041,264	1,052,612
Derivative financial instruments, Liabilities	154	740
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	69,559	88,649
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		301
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities — nonagency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	118,710	154,009
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities — agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	575,849	529,302
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	109,852	74,917
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | Hedged loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial Instruments, Assets	139,391	167,165
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	25,791	35,813
Measured on recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
SBA servicing rights	4,069	3,477
Total recurring assets at fair value	4,584	4,176
Derivative financial instruments, Liabilities	200	445
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | U.S. Government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | States and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale		0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities — nonagency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities — agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | Corporate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | Hedged loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial Instruments, Assets	0	0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale	0	0
Mortgage Derivatives | Measured on recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial Instruments, Assets	616	1,362
Derivative financial instruments, Liabilities	238	459
Mortgage Derivatives | Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial Instruments, Assets	0	0
Derivative financial instruments, Liabilities	0	0
Mortgage Derivatives | Measured on recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial Instruments, Assets	101	663
Derivative financial instruments, Liabilities	38	14
Mortgage Derivatives | Measured on recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial Instruments, Assets	515	699
Derivative financial instruments, Liabilities	200	445
Interest Rate Swaps and Caps | Measured on recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial Instruments, Assets	2,011	1,793
Derivative financial instruments, Liabilities	116	726
Interest Rate Swaps and Caps | Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial Instruments, Assets	0	0
Derivative financial instruments, Liabilities	0	0
Interest Rate Swaps and Caps | Measured on recurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial Instruments, Assets	2,011	1,793
Derivative financial instruments, Liabilities	116	726
Interest Rate Swaps and Caps | Measured on recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial Instruments, Assets	0	0
Derivative financial instruments, Liabilities	$ 0	$ 0

Fair Value (Unobservable Input

Fair Value (Unobservable Input Reconciliation) (Details) - SBA Servicing Rights - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of year	$ 3,477	$ 2,626	$ 1,516
Additions	1,213	1,323	1,070
Fair value adjustments	(621)	(472)	40
Balance, end of year	$ 4,069	$ 3,477	$ 2,626

Fair Value (Mortgage Derivative

Fair Value (Mortgage Derivatives Reconciliation) (Details) - Mortgage Derivatives - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Assets
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of year	$ 699	$ 651	$ 0
Acquired	0	0	272
Issuances	2,058	2,529	1,934
Settlements and closed loans	(2,242)	(2,481)	(1,555)
Balance, end of year	515	699	651
Other Liabilities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of year	445	361	0
Acquired	0	0	135
Issuances	1,367	2,041	1,500
Settlements and closed loans	(1,612)	(1,957)	(1,274)
Balance, end of year	$ 200	$ 445	$ 361

Fair Value (Financial Assets Me

Fair Value (Financial Assets Measured on a Nonrecurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, unpaid principal balance	$ 14,984	$ 13,776
Impaired loans, valuation allowance	1,238	831
Nonfinancial assets measured on a nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	11,804	8,784
Total nonrecurring assets at fair value	11,804	8,784
Nonfinancial assets measured on a nonrecurring basis | Collateral Dependent
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, unpaid principal balance	13,000	9,600
Impaired loans, valuation allowance	1,200	831
Nonfinancial assets measured on a nonrecurring basis | Quoted Market Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Total nonrecurring assets at fair value	0	0
Nonfinancial assets measured on a nonrecurring basis | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Total nonrecurring assets at fair value	0	0
Nonfinancial assets measured on a nonrecurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	11,804	8,784
Total nonrecurring assets at fair value	$ 11,804	$ 8,784

Fair Value (Nonfinancial Assets

Fair Value (Nonfinancial Assets Measured on a Nonrecurring Basis) (Details) - Nonfinancial assets measured on a nonrecurring basis - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 1,204	$ 13,292
Quoted Market Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 1,204	$ 13,292

Fair Value (Reconciliation of O

Fair Value (Reconciliation of Other Real Estate Owned) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 895	$ 10,897
Nonfinancial assets measured on a nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned at fair value	1,204	13,292
Other Real Estate Owned | Nonfinancial assets measured on a nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned at fair value	1,204	13,292
Estimated selling costs and other adjustments	(309)	(2,395)
Other real estate owned	$ 895	$ 10,897

Fair Value (Unobservable Inputs

Fair Value (Unobservable Inputs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
SBA Servicing Rights | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate (as a percent)	10.00%	9.00%
Prepayment speed (as a percent)	4.00%	3.00%
SBA Servicing Rights | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate (as a percent)	22.00%	18.00%
Prepayment speed (as a percent)	13.00%	11.00%
SBA Servicing Rights | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate (as a percent)	13.00%	13.00%
Prepayment speed (as a percent)	9.00%	8.00%
Mortgage Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pull-through rate (as a percent)	84.00%	84.00%
Impaired Loans | Minimum | Collateral Dependent
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Management discount for property type and recent market volatility (as a percent)	0.00%	0.00%
Impaired Loans | Maximum | Collateral Dependent
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Management discount for property type and recent market volatility (as a percent)	50.00%	50.00%
Impaired Loans | Weighted Average | Collateral Dependent
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Management discount for property type and recent market volatility (as a percent)	9.00%	9.00%
Other Real Estate Owned | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Management discount for property type and recent market volatility (as a percent)	0.00%	0.00%
Other Real Estate Owned | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Management discount for property type and recent market volatility (as a percent)	33.00%	68.00%
Other Real Estate Owned | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Management discount for property type and recent market volatility (as a percent)	12.00%	16.00%
Mortgage Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pull-through rate (as a percent)	84.00%	84.00%
Nonfinancial assets measured on a nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans - collateral dependent	$ 11,804	$ 8,784
Other real estate owned	1,204	13,292
Nonfinancial assets measured on a nonrecurring basis | Discounted Cash Flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	4,069	3,477
Nonfinancial assets measured on a nonrecurring basis | Third Party Appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	1,204	13,292
Nonfinancial assets measured on a nonrecurring basis | Third Party Appraisal | Collateral Dependent
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans - collateral dependent	11,804	8,784
Nonfinancial assets measured on a nonrecurring basis | Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	1,204	13,292
Nonfinancial assets measured on a nonrecurring basis | Mortgage Derivatives | Pricing Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring assets at fair value	515	699
Mortgage derivatives - liability	$ 200	$ 445

Fair Value (Estimated Fair Valu

Fair Value (Estimated Fair Value of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value Inputs, Assets, Quantative Information [Line Items]
Investment securities available-for-sale	$ 873,970	$ 847,178
Investment securities held-to-maturity	33,351	67,435
Loans held-for-sale	25,791	35,813
Carrying Amount | Level 1
Fair Value Inputs, Assets, Quantative Information [Line Items]
Cash and cash equivalents	230,877	149,593
Carrying Amount | Levels 2 and 3
Fair Value Inputs, Assets, Quantative Information [Line Items]
Investment securities held-to-maturity	32,852	67,063
Loans, net	3,503,443	2,787,974
Derivative financial instruments	616	1,362
Derivative financial instruments	238	459
Carrying Amount | Level 2
Fair Value Inputs, Assets, Quantative Information [Line Items]
Investment securities available-for-sale	873,970	847,178
Loans held-for-sale	36,211	52,169
Derivative financial instruments	2,011	1,793
Accrued interest receivable	14,906	10,210
Deposits	4,243,135	3,431,165
Federal funds purchased and securities sold under agreements to repurchase	25,209	27,673
FHLB Borrowings	0	47,014
Notes payable	398	398
Derivative financial instruments	116	726
Accrued interest payable	3,750	2,312
Carrying Amount | Level 3
Fair Value Inputs, Assets, Quantative Information [Line Items]
Other real estate owned	895	10,897
SBA servicing rights	4,069	3,477
Federal Home Loan Bank stock	4,651	5,680
Estimate of Fair Value | Level 1
Fair Value Inputs, Assets, Quantative Information [Line Items]
Cash and cash equivalents	230,877	149,593
Estimate of Fair Value | Levels 2 and 3
Fair Value Inputs, Assets, Quantative Information [Line Items]
Investment securities held-to-maturity	33,351	67,435
Loans, net	3,513,057	2,820,484
Derivative financial instruments	616	1,362
Derivative financial instruments	238	459
Estimate of Fair Value | Level 2
Fair Value Inputs, Assets, Quantative Information [Line Items]
Investment securities available-for-sale	873,970	847,178
Loans held-for-sale	37,580	53,770
Derivative financial instruments	2,011	1,793
Accrued interest receivable	14,906	10,210
Deposits	4,237,883	3,430,405
Federal funds purchased and securities sold under agreements to repurchase	25,209	27,673
FHLB Borrowings	0	47,014
Notes payable	398	398
Derivative financial instruments	116	726
Accrued interest payable	3,750	2,312
Estimate of Fair Value | Level 3
Fair Value Inputs, Assets, Quantative Information [Line Items]
Other real estate owned	1,204	13,292
SBA servicing rights	4,069	3,477
Federal Home Loan Bank stock	$ 4,651	$ 5,680

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of mortgage loans held for sale	$ 25,800,000	$ 35,800,000
Mortgage Loans Held-for-Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contractual balance including accrued interest	25,200,000	35,600,000
Gain on change in fair value	544,000	209,000
Loans 90 days or more past due	0
Mortgage Banking Income | Mortgage Loans Held-for-Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on change in fair value	334,000	(757,000)	$ 182,000
Mortgage Banking Income | Mortgage Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on change in fair value	$ 61,000	$ (36,000)	$ 153,000

Income Taxes (Components of Inc

Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current tax provision:
Federal	$ 27,484	$ 12,599	$ 35,151
State	2,926	540	5,126
Total current tax provision	30,410	13,139	40,277
Deferred tax provision:
Federal	10,010	10,958	(20,831)
State	622	2,087	(3,997)
Total deferred tax provision	10,632	13,045	(24,828)
Total income tax provision	$ 41,042	$ 26,184	$ 15,449

Income Taxes (Effective Income

Income Taxes (Effective Income Tax Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal statutory rate (as a percent)	35.00%
Federal taxes at statutory rate	$ 30,666	$ 25,821	$ 15,355
State taxes, net of federal benefit	2,306	1,708	734
Tax-exempt interest	(361)	(355)	(357)
Bank-owned life insurance income	(680)	(675)	(674)
Tax rate change - Tax Cuts and Jobs Act of 2017	8,106	0	0
Merger election	2,545	0	0
Stock based compensation	(904)	(255)	0
Other	(636)	(60)	391
Total income tax provision	41,042	$ 26,184	$ 15,449
Tax Cuts and Jobs Act of 2017, provisional income tax expense	8,100
Tax expense to remeasure acquisition related deferred tax assets due to tax reform	$ 2,500

Income Taxes (Deferred Tax Asse

Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets
Allowance for loan and lease losses	$ 7,274	$ 10,288
Net operating losses and credit carryforward	4,125	6,649
Accrued compensation	4,046	5,585
Tax basis difference on acquired assets	2,864	6,407
Other real estate owned	128	497
Unrealized losses on cash flow hedges	22	682
Estimated loss on acquired failed bank assets	2,646	6,327
Unrealized losses on securities available-for-sale	843	834
Other	1,125	538
Total deferred tax assets	23,073	37,807
Deferred tax liabilities
Intangible asset basis difference	(4,427)	(7,163)
Premises and equipment	(1,598)	(2,406)
Other	(1,472)	(989)
Total deferred tax liabilities	(7,497)	(10,558)
Net Deferred Tax Asset	15,576	27,249
Net operating loss carryforwards	16,300	$ 17,200
Net operating loss carryforwards annual limitation	$ 1,000

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Anti-dilutive securities excluded from computation of earnings per share (in shares)	0	0	0
Numerator:
Net income	$ 46,574	$ 47,591	$ 28,423
Net income allocated to participating securities	(1,222)	(1,303)	(783)
Net income allocated to common stock	45,352	46,288	27,640
Basic earnings per share computation:
Net income allocated to common stock	$ 45,352	$ 46,288	$ 27,640
Weighted average common shares outstanding, including shares considered participating securities (in shares)	38,945,515	36,942,866	35,796,497
Less: Average participating securities (in shares)	(1,022,195)	(1,011,338)	(985,642)
Weighted average shares (in shares)	37,923,320	35,931,528	34,810,855
Basic earnings per share (in dollars per share)	$ 1.20	$ 1.29	$ 0.79
Diluted earnings per share computation:
Net income allocated to common stock	$ 45,352	$ 46,288	$ 27,640
Weighted average shares (in shares)	37,923,320	35,931,528	34,810,855
Weighted average dilutive grants (in shares)	71,337	102,115	1,231,864
Weighted average shares and dilutive potential common shares (in shares)	37,994,657	36,033,643	36,042,719
Diluted earnings per share (in dollars per share)	$ 1.19	$ 1.28	$ 0.77

Accumulated Other Comprehens128

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	$ 613,633	$ 536,490	$ 464,095
Other comprehensive loss before income taxes:
Amortization of net unrealized losses on securities transferred to held-to-maturity	196	(3)	0
Adoption of ASU 2018-02	0
Balance	641,551	613,633	536,490
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(2,457)	(1,634)	3,920
Other comprehensive loss before income taxes:
Net change in unrealized (losses) gains	(2,816)	(1,910)	(9,249)
Amounts reclassified for net losses realized and included in earnings	3,071	682	192
Transfer of net unrealized loss from available-for-sale to held-to-maturity		0
Amortization of net unrealized losses on securities transferred to held-to-maturity	196	(3)
Adoption of ASU 2018-02	(453)
Income tax benefit	108	(408)	(3,503)
Balance	(2,567)	(2,457)	(1,634)
Investment Securities Available-for-Sale
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(1,200)	(272)	4,210
Other comprehensive loss before income taxes:
Net change in unrealized (losses) gains	(2,874)	(1,196)	(6,955)
Amounts reclassified for net losses realized and included in earnings	1,453	(489)	(354)
Transfer of net unrealized loss from available-for-sale to held-to-maturity		172
Amortization of net unrealized losses on securities transferred to held-to-maturity	0	0
Adoption of ASU 2018-02	(442)
Income tax benefit	(540)	(585)	(2,827)
Balance	(2,523)	(1,200)	(272)
Held-to-Maturity Securities Transferred from Available-for-Sale
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(175)	0	0
Other comprehensive loss before income taxes:
Net change in unrealized (losses) gains	0	0	0
Amounts reclassified for net losses realized and included in earnings	0	0	0
Transfer of net unrealized loss from available-for-sale to held-to-maturity		(172)
Amortization of net unrealized losses on securities transferred to held-to-maturity	196	(3)
Adoption of ASU 2018-02	0
Income tax benefit	0	0	0
Balance	21	(175)	0
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(1,082)	(1,362)	(290)
Other comprehensive loss before income taxes:
Net change in unrealized (losses) gains	58	(714)	(2,294)
Amounts reclassified for net losses realized and included in earnings	1,618	1,171	546
Transfer of net unrealized loss from available-for-sale to held-to-maturity		0
Amortization of net unrealized losses on securities transferred to held-to-maturity	0	0
Adoption of ASU 2018-02	(11)
Income tax benefit	648	177	(676)
Balance	$ (65)	$ (1,082)	$ (1,362)

Accumulated Other Comprehens129

Accumulated Other Comprehensive Income (Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense on deposits	$ (15,592)	$ (9,619)	$ (7,922)
Income tax (expense) benefit	(41,042)	(26,184)	(15,449)
Investment Securities Available-for-Sale | Reclassifications out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Loss) gain on sale of investment securities	(1,453)	489	354
Income tax (expense) benefit	558	(189)	(137)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(895)	300	217
Cash Flow Hedges | Reclassifications out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense on deposits	(1,618)	(1,171)	(546)
Income tax (expense) benefit	621	453	211
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (997)	$ (718)	$ (335)

Condensed Financial Informat130

Condensed Financial Information of State Bank Financial Corporation (Parent Company Only Financial Statements) (Condensed Statements of Financial Condition) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets [Abstract]
Cash and due from banks	$ 17,438	$ 13,219
Securities available-for-sale	873,970	847,178
Securities held-to-maturity	32,852	67,063
Other assets	61,560	99,248
Total assets	4,958,582	4,224,859
Liabilities:
Other liabilities	48,289	104,976
Total liabilities	4,317,031	3,611,226
Shareholders' equity	641,551	613,633	$ 536,490	$ 464,095
Total liabilities and shareholders' equity	4,958,582	4,224,859
Parent Company
Assets [Abstract]
Cash and due from banks	55,099	79,129
Securities available-for-sale	1,515	1,546
Securities held-to-maturity	10,161	10,259
Investment in subsidiary	574,769	550,346
Other assets	939	8,082
Total assets	642,483	649,362
Liabilities:
Other liabilities	932	35,729
Total liabilities	932	35,729
Shareholders' equity	641,551	613,633
Total liabilities and shareholders' equity	$ 642,483	$ 649,362

Condensed Financial Informat131

Condensed Financial Information of State Bank Financial Corporation (Parent Company Only Financial Statements) (Condensed Statements of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest income:
Interest income	$ 208,378	$ 165,257	$ 158,591
Net interest income	192,786	155,638	150,669
Noninterest income:
Other income	5,765	4,032	3,864
Total noninterest income	39,757	39,301	20,111
Noninterest expense:
Salaries and employee benefits	91,844	78,775	83,295
Other noninterest expense	7,790	7,330	7,079
Total noninterest expense	138,817	120,927	123,422
Income before income taxes	87,616	73,775	43,872
Income tax expense	41,042	26,184	15,449
Net income	46,574	47,591	28,423
Parent Company
Interest income:
Interest income	934	940	57
Net interest income	934	940	57
Noninterest income:
Dividends from subsidiary	24,400	58,000	17,900
Other income	416	243	3,125
Total noninterest income	24,816	58,243	21,025
Noninterest expense:
Salaries and employee benefits	1,425	2,246	7,537
Other noninterest expense	1,807	1,485	4,685
Total noninterest expense	3,232	3,731	12,222
Income before income taxes	22,518	55,452	8,860
Income tax expense	(374)	(1,306)	(3,413)
Income before equity in undistributed net income of subsidiary	22,892	56,758	12,273
Equity in earnings of subsidiary greater than (less than) dividends received	23,682	(9,167)	16,150
Net income	$ 46,574	$ 47,591	$ 28,423

Condensed Financial Informat132

Condensed Financial Information of State Bank Financial Corporation (Parent Company Only Financial Statements) (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows from Operating Activities
Net income	$ 46,574	$ 47,591	$ 28,423
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Share-based compensation expense	3,791	3,889	3,595
Net cash provided by (used in) operating activities	69,827	19,720	(28,785)
Cash flows from Investing Activities
Purchase of investment securities available-for-sale	(382,683)	(298,814)	(648,133)
Net cash used in investing activities	(20,814)	(198,684)	(322,060)
Cash Flows from Financing Activities
Issuance of common stock	1	200	547
Repurchase of common stock	0	(5,128)	0
Restricted stock activity	(1,174)	(116)	(124)
Dividends paid	(21,814)	(20,681)	(11,631)
Net cash provided by financing activities	32,271	153,195	45,049
Net increase (decrease) in cash and cash equivalents	81,284	(25,769)	(305,796)
Cash and cash equivalents, beginning	149,593	175,362	481,158
Cash and cash equivalents, ending	230,877	149,593	175,362
Parent Company
Cash Flows from Operating Activities
Net income	46,574	47,591	28,423
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Undistributed earnings of subsidiary (greater than) less than dividends received	(23,682)	9,167	(16,150)
Share-based compensation expense	3,791	3,889	3,595
Other, net	6,622	(2,771)	(2,059)
Net cash provided by (used in) operating activities	33,305	57,876	13,809
Cash flows from Investing Activities
Cash consideration paid, net of cash received for bank acquisitions	(34,171)	(3,685)	(25,884)
Purchase of investment securities available-for-sale	0	0	(11,758)
Other	(39)	0	0
Net cash used in investing activities	(34,210)	(3,685)	(37,642)
Cash Flows from Financing Activities
Issuance of common stock	1	200	547
Repurchase of common stock	0	(5,128)	0
Restricted stock activity	(1,312)	(116)	(27)
Dividends paid	(21,814)	(20,681)	(11,631)
Net cash provided by financing activities	(23,125)	(25,725)	(11,111)
Net increase (decrease) in cash and cash equivalents	(24,030)	28,466	(34,944)
Cash and cash equivalents, beginning	79,129	50,663	85,607
Cash and cash equivalents, ending	$ 55,099	$ 79,129	$ 50,663

Other Real Estate Owned (Types

Other Real Estate Owned (Types of OREO) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Total other real estate owned	$ 895	$ 10,897
Construction, land development, and other land
Financing Receivable, Impaired [Line Items]
Total other real estate owned	645	2,393
Commercial and farmland real estate
Financing Receivable, Impaired [Line Items]
Total other real estate owned	153	6,960
Residential real estate
Financing Receivable, Impaired [Line Items]
Total other real estate owned	$ 97	$ 1,544

Other Real Estate Owned (By Typ

Other Real Estate Owned (By Type of Loan Foreclosure) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Total other real estate owned	$ 895	$ 10,897
Consumer mortgage loans secured by residential real estate in process of foreclosure	49
Organic OREO
Financing Receivable, Impaired [Line Items]
Total other real estate owned	153	282
Purchased Credit Impaired OREO
Financing Receivable, Impaired [Line Items]
Total other real estate owned	$ 742	$ 10,615