State Bank Financial (STBZ) 10-Q 9 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 08, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	STATE BANK FINANCIAL CORP
Entity Central Index Key	1,497,275
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding (shares)		38,800,431
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	[1]
Assets
Cash and amounts due from depository institutions	$ 16,273	$ 17,438
Interest-bearing deposits in other financial institutions	186,524	211,142
Federal funds sold	5,130	2,297
Cash and cash equivalents	207,927	230,877
Equity securities	1,515	1,515
Debt securities available-for-sale	772,369	872,455
Debt securities held-to-maturity (fair value of $13,035 and $33,351, respectively)	13,000	32,852
Loans	3,637,334	3,532,193
Allowance for loan and lease losses	(34,789)	(28,750)
Loans, net	3,602,545	3,503,443
Loans held-for-sale (includes loans at fair value of $13,294 and $25,791, respectively)	30,676	36,211
Other real estate owned	5,442	895
Premises and equipment, net	56,007	51,794
Goodwill	84,564	84,564
Other intangibles, net	9,074	11,034
SBA servicing rights	3,842	4,069
Bank-owned life insurance	68,772	67,313
Other assets	68,344	61,560
Total assets	4,924,077	4,958,582
Liabilities:
Noninterest-bearing deposits	1,151,511	1,191,106
Interest-bearing deposits	3,035,403	3,052,029
Total deposits	4,186,914	4,243,135
Federal funds purchased and securities sold under agreements to repurchase	33,621	25,209
Notes payable	0	398
Other liabilities	39,365	48,289
Total liabilities	4,259,900	4,317,031
Shareholders' equity:
Preferred stock, $1 par value; 2,000,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $.01 par value; 100,000,000 shares authorized; 38,800,431 and 38,992,163 shares issued and outstanding, respectively	388	390
Additional paid-in capital	419,027	413,583
Retained earnings	257,103	230,145
Accumulated other comprehensive loss, net of tax	(12,341)	(2,567)
Total shareholders' equity	664,177	641,551
Total liabilities and shareholders' equity	$ 4,924,077	$ 4,958,582
[1]	Derived from audited financial statements

CONSOLIDATED STATEMENTS OF FI_2

CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Debt securities held-to-maturity - fair value	$ 13,035	$ 33,351
Loans held-for-sale at fair value	$ 13,294	$ 25,791
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)	38,800,431	38,992,163
Common stock, shares outstanding (in shares)	38,800,431	38,992,163

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest income:
Loans	$ 51,553	$ 35,400	$ 150,413	$ 104,332
Loan accretion	8,154	6,520	20,695	23,425
Investment securities	5,831	5,564	18,092	16,587
Deposits with other financial institutions	1,086	218	1,673	402
Total interest income	66,624	47,702	190,873	144,746
Interest expense:
Deposits	8,031	3,260	20,797	9,491
FHLB borrowings	0	94	463	435
Notes payable	0	9	24	29
Federal funds purchased and repurchase agreements	8	7	18	23
Total interest expense	8,039	3,370	21,302	9,978
Net interest income	58,585	44,332	169,571	134,768
Provision for loan and lease losses	2,209	415	7,810	3,262
Net interest income after provision for loan and lease losses	56,376	43,917	161,761	131,506
Noninterest income:
Service charges on deposits	1,572	1,575	4,659	4,513
Mortgage banking income	1,818	2,793	7,868	8,783
SBA income	1,401	1,464	3,845	4,625
Payroll and insurance income	1,667	1,487	5,035	4,400
ATM income	909	826	2,698	2,522
Bank-owned life insurance income	541	526	1,459	1,475
Gain on sale of investment securities	181	3	431	28
Other	1,649	1,008	5,121	3,271
Total noninterest income	9,738	9,682	31,116	29,617
Noninterest expense:
Salaries and employee benefits	23,166	20,701	73,487	63,267
Occupancy and equipment	3,240	3,187	10,157	9,796
Data processing	2,808	2,587	8,400	7,608
Legal and professional fees	1,187	700	2,893	3,403
Merger-related expenses	10,967	135	14,832	2,742
Marketing	744	342	2,109	1,409
Federal deposit insurance premiums and other regulatory fees	528	407	1,617	1,202
Loan collection costs and OREO activity	(204)	181	(154)	(1,074)
Amortization of intangibles	655	701	1,960	2,094
Other	3,227	2,630	10,268	7,686
Total noninterest expense	46,318	31,571	125,569	98,133
Income before income taxes	19,796	22,028	67,308	62,990
Income tax expense	1,841	7,592	13,221	21,793
Net income	$ 17,955	$ 14,436	$ 54,087	$ 41,197
Basic earnings per share (usd per share)	$ 0.46	$ 0.37	$ 1.38	$ 1.06
Diluted earnings per share (usd per share)	0.46	0.37	1.38	1.06
Cash dividends declared per common share (usd per share)	$ 0.2000	$ 0.14000	$ 0.6	$ 0.42
Weighted Average Shares Outstanding:
Basic (in shares)	38,193,099	37,918,753	38,088,378	37,894,385
Diluted (shares)	38,211,476	37,963,141	38,110,938	37,943,971

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 17,955	$ 14,436	$ 54,087	$ 41,197
Other comprehensive income (loss), net of tax:
Net change in unrealized (losses) gains	(3,232)	1,604	(12,296)	2,198
Amortization of net unrealized losses (gains) on securities transferred to held-to-maturity	7	(4)	30	40
Transfer of unrealized gain from held-to-maturity to available-for-sale	0	0	(51)	0
Amounts reclassified for (gains) losses realized and included in earnings	(181)	376	(340)	1,185
Other comprehensive (loss) income, before income taxes	(3,406)	1,976	(12,657)	3,423
Income tax expense	(863)	760	(2,860)	1,309
Other comprehensive (loss) income, net of income taxes	(2,543)	1,216	(9,797)	2,114
Comprehensive income	$ 15,412	$ 15,652	$ 44,290	$ 43,311

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total		Warrants	Common Stock	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance warrants (in shares) at Dec. 31, 2016			133,912
Balance (in shares) at Dec. 31, 2016				38,845,573
Balance, beginning of period at Dec. 31, 2016	$ 613,633			$ 388	$ 409,736	$ 205,966	$ (2,457)
Increase (decrease) in shareholders' equity
Exercise of stock warrants (in shares)			(46,008)	(31,939)
Exercise of stock warrants	1			$ 1
Share-based compensation	2,826				2,826
Restricted stock activity (in shares)				96,939
Restricted stock activity	(1,097)			$ 1	(649)	(449)
Stock option activity (in shares)				4,085
Stock option activity	(65)				200	(265)
Issuance of common stock (in shares)				12,486
Issuance of common stock	335			$ 0	335
Other comprehensive income (loss)	2,114						2,114
Common stock dividends	(16,354)					(16,354)
Net income	41,197					41,197
Balance warrants (in shares) at Sep. 30, 2017			87,904
Balance (in shares) at Sep. 30, 2017				38,991,022
Balance, end of period at Sep. 30, 2017	642,590			$ 390	412,448	230,095	(343)
Balance, beginning of period at Jun. 30, 2017							(1,559)
Increase (decrease) in shareholders' equity
Net income	14,436
Balance warrants (in shares) at Sep. 30, 2017			87,904
Balance (in shares) at Sep. 30, 2017				38,991,022
Balance, end of period at Sep. 30, 2017	642,590			$ 390	412,448	230,095	(343)
Increase (decrease) in shareholders' equity
Adoption of ASU 2016-01	$ 23					(23)	23
Balance warrants (in shares) at Dec. 31, 2017			82,904
Balance (in shares) at Dec. 31, 2017	38,992,163			38,992,163
Balance, beginning of period at Dec. 31, 2017	$ 641,551	[1]		$ 390	413,583	230,145	(2,567)
Increase (decrease) in shareholders' equity
Exercise of stock warrants (in shares)			(59,334)	(40,903)
Exercise of stock warrants	5			$ 0	5
Share-based compensation	12,188				12,188
Restricted stock activity (in shares)				(232,635)
Restricted stock activity	(10,408)			$ (2)	(6,749)	(3,657)
Other comprehensive income (loss)	(9,797)						(9,797)
Common stock dividends	(23,449)					(23,449)
Net income	$ 54,087					54,087
Balance warrants (in shares) at Sep. 30, 2018			23,570
Balance (in shares) at Sep. 30, 2018	38,800,431			38,800,431
Balance, end of period at Sep. 30, 2018	$ 664,177			$ 388	419,027	257,103	(12,341)
Balance, beginning of period at Jun. 30, 2018							(9,798)
Increase (decrease) in shareholders' equity
Net income	$ 17,955
Balance warrants (in shares) at Sep. 30, 2018			23,570
Balance (in shares) at Sep. 30, 2018	38,800,431			38,800,431
Balance, end of period at Sep. 30, 2018	$ 664,177			$ 388	$ 419,027	$ 257,103	$ (12,341)
[1]	Derived from audited financial statements

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]
Dividends per share (usd per share)	$ 0.6	$ 0.42

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017
Cash Flows from Operating Activities
Net income	$ 54,087		$ 41,197
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	6,969		8,668
Provision for loan and lease losses	7,810		3,262
Accretion on acquisitions, net	(20,695)		(23,425)
Gains on sales of other real estate owned	(918)		(1,780)
Writedowns of other real estate owned	128		130
Proceeds from sales of mortgage loans held-for-sale	352,931		370,290
Proceeds from sales of SBA loans held-for-sale	36,804		38,722
Originations of mortgage loans held-for-sale	(335,544)		(358,514)
Originations of SBA loans held-for-sale	(40,538)		(32,679)
Mortgage banking activities	(7,868)		(8,783)
Gains on sales of SBA loans	(3,228)		(3,642)
Net gains on sales of available-for-sale securities	(431)		(28)
Share-based compensation expense	12,188		2,826
Changes in fair value of SBA servicing rights	965		377
Changes in other assets and other liabilities, net	(9,807)		1,550
Net cash provided by operating activities	52,853		38,171
Cash flows from Investing Activities
Purchase of investment securities available-for-sale	(57,201)		(216,960)
Proceeds from sales and calls of investment securities available-for-sale	14,987		71,588
Proceeds from maturities and paydowns of investment securities available-for-sale	137,444		147,429
Proceeds from maturities and paydowns of investment securities held-to-maturity	9,779		14,301
Purchase of investment securities held-to-maturity	0		(5,000)
Loan originations, repayments and resolutions, net	(92,716)		(20,595)
Net purchases of premises and equipment	(7,338)		(1,590)
Proceeds from sales of other real estate owned	2,742		11,926
Net cash received in excess of assets and liabilities acquired in purchase business combinations	0		57,255
Net cash provided by investing activities	7,697		58,354
Cash Flows from Financing Activities
Net (decrease) increase in noninterest-bearing customer deposits	(39,595)		92,626
Net (decrease) increase in interest-bearing customer deposits	(16,626)		11,693
Repayment of other borrowed funds	(398)		0
Proceeds from FHLB advances	694,500		880,000
Repayments of FHLB advances	(694,500)		(927,014)
Net increase (decrease) in federal funds purchased and securities sold under repurchase agreements	8,412		(2,174)
Payment of contingent consideration	(1,441)		(1,495)
Exercise of stock warrants	5		1
Restricted stock activity	(10,408)		(1,097)
Stock option activity	0		(65)
Dividends paid to shareholders	(23,449)		(16,354)
Net cash (used in) provided by financing activities	(83,500)		36,121
Net (decrease) increase in cash and cash equivalents	(22,950)		132,646
Cash and cash equivalents, beginning	230,877	[1]	149,593
Cash and cash equivalents, ending	207,927		282,239
Supplemental Disclosure of Noncash Investing and Financing Activities
Unrealized (losses) gains on securities and cash flow hedges, net of tax	(9,797)		2,114
Transfer of debt securities held-to-maturity to available-for-sale	10,066		0
Transfers of loans to other real estate owned	6,499		1,340
Acquisitions:
Assets acquired	0		909,117
Liabilities assumed	0		713,663
Net assets	0		195,454
Goodwill and fair value adjustments	$ 0		$ 7,480
[1]	Derived from audited financial statements

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	NOTE 1: BASIS OF PRESENTATION Overview State Bank Financial Corporation (the "Company" or "we") is a bank holding company whose business is primarily conducted through its wholly-owned banking subsidiary, State Bank and Trust Company (the "Bank" or "State Bank"). We operate a full service banking business and offer a broad range of commercial and retail banking products to our customers throughout seven of Georgia's eight largest metropolitan statistical areas, or MSAs. The accompanying unaudited consolidated financial statements for the Company have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information. Accordingly, the financial statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statement presentation. The interim consolidated financial statements included herein are unaudited, but reflect all adjustments, consisting of normal and recurring items, which, in the opinion of management, are necessary for a fair presentation of the consolidated financial position and results of operations for the interim period presented. All significant intercompany accounts and transactions have been eliminated in consolidation. The results of operations for the period ended September 30, 2018 are not necessarily indicative of the results to be expected for the full year. These financial statements should be read in conjunction with the financial statements and notes thereto and the report of our independent registered public accounting firm included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 . Certain amounts have been reclassified to conform to the current period presentation. The reclassifications had no effect on net income or shareholders’ equity as previously reported. Proposed Merger with Cadence Bancorporation On May 11, 2018, the Company entered into an Agreement and Plan of Merger (the "Merger Agreement") with Cadence Bancorporation, a Delaware corporation ("Cadence"). The Merger Agreement provides that, upon the terms and subject to the conditions set forth therein, the Company will merge with and into Cadence, with Cadence continuing as the surviving corporation. Immediately following the completion of the merger, the Bank will merge with and into Cadence’s wholly-owned bank subsidiary, Cadence Bank, N.A. (“Cadence Bank”), with Cadence Bank continuing as the surviving bank. Subject to the terms and conditions of the Merger Agreement, if the merger is completed, Company shareholders will receive 1.160 shares of Cadence Class A common stock, par value $0.01 per share, for each share of Company common stock, par value $0.01 per share, they hold immediately prior to the merger, plus cash in lieu of fractional shares. The transaction is expected to close in the fourth quarter of 2018, subject to receipt of certain regulatory approvals in addition to satisfaction of certain other closing conditions.

Adoption of New Accounting Stan

Adoption of New Accounting Standards and Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2018
Accounting Changes and Error Corrections [Abstract]
Adoption of New Accounting Standards and Recent Accounting Pronouncements	NOTE 2: ADOPTION OF NEW ACCOUNTING STANDARDS AND RECENT ACCOUNTING PRONOUNCEMENTS Adoption of New Accounting Standards ASU 2018-05 — In March 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2018-05, Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 . The purpose of this ASU is to codify the SEC's guidance issued in Staff Accounting Bulletin 118. The amendments in this update were effective upon issuance. The adoption did not have a material impact on our consolidated financial statements. ASU 2018-04 — In March 2018, FASB issued ASU 2018-04, Investment - Debt Securities (Topic 320) and Regulated Operations (Topic 980): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 117 and SEC Release No. 33-9273 . The purpose of this ASU is to codify the SEC's guidance issued in Staff Accounting Bulletin 117. The amendments in this update were effective upon issuance. The adoption did not have a material impact on our consolidated financial statements. ASU 2017-12 — On August 28, 2017, 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. AS U 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 adopted the amendments in this ASU effective January 1, 2018. The adoption changed the location of changes in fair value of the hedging instrument and hedged item to interest income for periods subsequent to adoption and enhanced disclosures of derivatives and hedging activities. The Company did not elect to modify the measurement methodology for any fair value hedges existing as of the adoption date and there was no cumulative effect adjustment required upon adoption. See Note 8 for enhanced disclosures. ASU 2017-09 — On May 10, 2017, 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. The Company adopted the amendments in this ASU effective January 1, 2018. The adoption did not have a material impact on our consolidated financial statements. ASU 2018-03 — In February 2018, FASB issued ASU 2018-03, Technical Corrections and Improvements to Financial Instruments - Overall (Subtopic 825-10). This Update clarifies certain aspects of the guidance issued in ASU 2016-01 including (i) that an entity measuring an equity security using the measurement alternative may make an irrevocable election to change its measurement approach to a fair value method under Topic 820 for that security and any identical or similar investments of the same issuer, (ii) that fair value adjustments under the measurement alternative should be as of the date the observable transaction for a similar security occurred, (iii) requiring the remeasurement of the entire value of forward contracts and purchased options when observable transactions occur on the underlying equity securities, (iv) that financial liabilities for which the fair value option is elected should follow the guidance in paragraph 825-10-45-5, (v) that changes in the fair value of financial liabilities for which the fair value option is elected relating to the instrument-specific credit risk should first be measured in the currency of denomination and then both components of the change in fair value should be remeasured into the reporting entity's functional currency using end-of-period spot rates, and (vi) that the prospective transition approach should only be applied for instances in which the measurement alternative is applied. The guidance was effective for interim periods beginning after June 15, 2018 and may be early adopted provided ASU 2016-01 was adopted. The Company adopted the amendments in this ASU effective January 1, 2018. The adoption did not have a material impact on our consolidated financial statements. 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) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (iii) eliminates 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) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (v) requires 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) requires 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) clarifies 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. The Company adopted the amendments in this ASU effective January 1, 2018. The adoption of 2016-01 resulted in a reclassification of unrealized loss of $23,000 from accumulated other comprehensive loss to retained earnings. 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 , ASU 2016-20 Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers, and ASU 2017-05 Other Income - Gains and losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20) - Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets — 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 or services to customers in an amount equal to the consideration the entity receives or expects to receive in exchange for those goods or services. The guidance also includes expanded disclosure requirements that provide 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 adopted the amendments in this ASU effective January 1, 2018 using the modified retrospective method. Since there was no change to net income impact upon adoption of the new guidance, a cumulative effect adjustment to opening retained earnings was not necessary. See below for additional information related to revenue generated from contracts with customers. Revenue Recognition On January 1, 2018 the Company adopted ASC Topic 606, using the modified retrospective method. Disclosures of revenue from contracts with customers for periods beginning after January 1, 2018 are presented under ASC Topic 606 and have not materially changed from the prior year amounts. Consistent with this guidance, noninterest income within the scope of this guidance is recognized as services are transferred to our customers in an amount that reflects the considerations we expect to be entitled to in exchange for those services. The Company's revenue streams that were in scope include service charges on deposits, payroll and insurance income, ATM income and other noninterest income. Services Charges on Deposits - Service charges on deposits primarily consist of monthly maintenance charges, correspondent bank service charges, analysis charges and NSF charges. The fee for NSF charges and certain service charges are fixed and the performance obligation is typically satisfied at the time of the related transaction. The consideration for analysis charges and monthly maintenance charges are variable as the fee can be reduced if the customer meets certain qualifying metrics. The Company's performance obligations are satisfied either at the time of the transaction or over the course of a month. Payroll and insurance income - Payroll and insurance income consists principally of payroll processing fees, property and casualty brokerage and employee benefits brokerage. Payroll processing fees are charged as the services are provided and the Company satisfied its performance obligation simultaneously. Property and casualty includes the brokerage of both personal and commercial coverages. The placement of the policy is completion of the Company's performance obligation and revenue is recognized at that time. The Company's commission is a percentage of the premium. Employee benefits brokerage consists of assisting companies in designing and managing comprehensive employee benefit programs. The services provided by the Company are collectively benefit management services which are considered a bundle of services that are highly interrelated. Each of the underlying services are activities to fulfill the benefit management service and are not distinct and separate performance obligations. Revenue is recognized over the contract term as services are rendered on a monthly basis. Customer payments are usually received on a monthly basis. ATM Income - ATM income represents revenues earned from interchange fees and merchant processing fees. Interchange revenues are earned on debit card transactions conducted with payment networks. ATM fees primarily consist of surcharges assessed to our customers for using a non-Bank ATM or a non-Bank customer using our ATM. Such fees generally are recognized concurrently with the delivery of services on a daily basis. Other - Other noninterest income primarily consists of certain transaction based fees where the performance obligation is satisfied simultaneously with the revenue recognition. Contract Costs - Costs associated with revenue from contracts with customers related primarily to contracts that have a period of one year or less. The Company has elected to expense the associated costs as incurred. Contract Balances - The Company records contract assets when revenue is recognized prior to receipt of consideration from the customer. The Company does not have material contract assets at period-end. The Company records contract liabilities when the consideration is received or due in advance of providing services to customers. The Company typically receives payments for its services during the period or at the time services are provided and does not have material contract liabilities at period-end. Recent Accounting Pronouncements ASU 2018-16 — In October 2018, FASB issued ASU 2018-16, Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes. This ASU permits the use of the OIS rate based on SOFR as a benchmark interest rate for hedge accounting purposes. 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. The guidance is not expected to have a significant impact on the Company's financial position, results of operations or disclosures. ASU 2018-13 — In August 2018, FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. This Update is part of the FASB's ongoing disclosure framework project and modifies disclosure requirements of fair value measurements. The guidance removed the requirement to disclose (i) the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, (ii) the policy for timing of transfers between levels and (iii) the valuation processes for Level 3 fair value measurements. The guidance also added required disclosures of the change in unrealized gains and losses for recurring Level 3 fair value measurements and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. The ASU is effective for annual reporting periods, including interim periods within those annual reporting periods, beginning after December 15, 2019. 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 position, 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 position, 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, Leases (Topic 842), ASU 2018-10 Codification Improvements to Topic 842, Leases and ASU 2018-11 Leases (Topic 842): Targeted Improvements — 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.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Acquisitions	NOTE 3: 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 and the final merger consideration was distributed in October 2017. 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, all 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 payable 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, 2017 (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, 2017. Merger-related costs are not included in the pro forma statements below. Nine Months Ended September 30 2018 2017 Pro Forma Pro Forma Net interest income $ 169,571 $ 166,354 Net income 55,865 48,387 Earnings per share: Basic $ 1.43 $ 1.24 Diluted 1.43 1.24 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.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Investment Securities	NOTE 4: INVESTMENT SECURITIES The amortized cost and fair value of debt securities classified as available-for-sale are as follows (dollars in thousands) : September 30, 2018 December 31, 2017 Debt Securities Available-for-Sale Amortized Cost Unrealized Gains Unrealized Losses Fair Value Amortized Cost Unrealized Gains Unrealized Losses Fair Value U.S. Government securities $ 67,700 $ — $ 1,002 $ 66,698 $ 70,203 $ — $ 644 $ 69,559 Residential mortgage-backed securities — nonagency 80,719 2,078 90 82,707 115,639 3,183 112 118,710 Residential mortgage-backed securities — agency 525,691 88 17,993 507,786 582,845 319 7,315 575,849 Corporate securities 114,779 1,107 708 115,178 107,115 1,299 77 108,337 Total debt securities available-for-sale $ 788,889 $ 3,273 $ 19,793 $ 772,369 $ 875,802 $ 4,801 $ 8,148 $ 872,455 The amortized cost and fair value of debt securities classified as held-to-maturity are as follows (dollars in thousands) : September 30, 2018 December 31, 2017 Debt Securities Held-to-Maturity Amortized Cost Unrealized Gains Unrealized Losses Fair Value Amortized Cost Unrealized Gains Unrealized Losses Fair Value Asset-backed securities $ 13,000 $ 37 $ 2 $ 13,035 $ 22,692 $ 259 $ — $ 22,951 Corporate securities — — — — 10,160 240 — 10,400 Total debt securities held-to-maturity $ 13,000 $ 37 $ 2 $ 13,035 $ 32,852 $ 499 $ — $ 33,351 The amortized cost and estimated fair value of debt securities by contractual maturities are summarized in the tables below (dollars in thousands) : Debt Securities Available-for-Sale Distribution of Maturities (1) September 30, 2018 1 Year or Less 1-5 Years 5-10 Years After 10 Years Total Amortized Cost: U.S. Government securities $ 28,017 $ 39,683 $ — $ — $ 67,700 Residential mortgage-backed securities — nonagency — — 282 80,437 80,719 Residential mortgage-backed securities — agency 4,168 63,372 105,393 352,758 525,691 Corporate securities 33,331 50,082 31,028 338 114,779 Total debt securities available-for-sale $ 65,516 $ 153,137 $ 136,703 $ 433,533 $ 788,889 Fair Value: U.S. Government securities $ 27,802 $ 38,896 $ — $ — $ 66,698 Residential mortgage-backed securities — nonagency — — 290 82,417 82,707 Residential mortgage-backed securities — agency 4,157 61,565 101,718 340,346 507,786 Corporate securities 33,337 49,575 31,533 733 115,178 Total debt securities available-for-sale $ 65,296 $ 150,036 $ 133,541 $ 423,496 $ 772,369 Debt Securities Held-to-Maturity Distribution of Maturities (1) September 30, 2018 1 Year or Less 1-5 Years 5-10 Years After 10 Years Total Amortized Cost: Asset-backed securities $ — $ — $ 4,000 $ 9,000 $ 13,000 Corporate securities — — — — — Total debt securities held-to-maturity $ — $ — $ 4,000 $ 9,000 $ 13,000 Fair Value: Asset-backed securities $ — $ — $ 3,998 $ 9,037 $ 13,035 Corporate securities — — — — — Total debt securities held-to-maturity $ — $ — $ 3,998 $ 9,037 $ 13,035 (1) Actual cash flows may differ from contractual maturities as borrowers may prepay obligations without prepayment penalties. The following tables provide information regarding debt securities with unrealized losses (dollars in thousands) : Less than 12 Months 12 Months or More Total Debt Securities Available-for-Sale Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses September 30, 2018 U.S. Government securities $ 9,779 $ 199 $ 56,919 $ 803 $ 66,698 $ 1,002 Residential mortgage-backed securities — nonagency 1,544 10 3,242 80 4,786 90 Residential mortgage-backed securities — agency 233,946 7,439 269,757 10,554 503,703 17,993 Corporate securities 74,801 626 6,438 82 81,239 708 Total temporarily impaired securities $ 320,070 $ 8,274 $ 336,356 $ 11,519 $ 656,426 $ 19,793 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 32,495 77 — — 32,495 77 Total temporarily impaired securities $ 393,140 $ 2,992 $ 237,567 $ 5,156 $ 630,707 $ 8,148 Less than 12 Months 12 Months or More Total Debt Securities Held-to-Maturity Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses September 30, 2018 Asset-backed securities $ 3,998 $ 2 $ — $ — $ 3,998 $ 2 Total temporarily impaired securities $ 3,998 $ 2 $ — $ — $ 3,998 $ 2 At September 30, 2018 , the Company held 152 debt 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 September 30, 2018 , there was no intent to sell any of the 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 debt securities; therefore, these securities are not deemed to be other than temporarily impaired. During the second quarter of 2018, the Company transferred a $10.1 million corporate security from held-to-maturity to available-for-sale. The issuing corporation was the target of a merger which caused the Company to change its assessment of the issuing corporation's creditworthiness. Subsequently, the Company sold a $4.0 million portion of this debt security's par value. Sales and calls of securities are summarized in the following table for the periods presented (dollars in thousands) : Three Months Ended Nine Months Ended September 30 September 30 Debt Securities Available-For-Sale 2018 2017 2018 2017 Proceeds from sales and calls $ 10,712 $ 6,810 $ 14,987 $ 71,588 Gross gains on sales and calls $ 188 $ 3 $ 438 $ 121 Gross losses on sales and calls (7 ) — (7 ) (93 ) Net realized gains on sales and calls $ 181 $ 3 $ 431 $ 28 The composition of debt 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. Debt securities with an aggregate fair value of $187.2 million and $116.1 million at September 30, 2018 and December 31, 2017 , respectively, were pledged to secure public deposits and repurchase agreements.

Loans

Loans	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Loans	NOTE 5: LOANS Loans, in total, are summarized as follows (dollars in thousands) : Total Loans September 30, 2018 December 31, 2017 Construction, land & land development $ 500,095 $ 451,993 Other commercial real estate 1,186,724 1,255,002 Total commercial real estate 1,686,819 1,706,995 Residential real estate 329,470 333,086 Owner-occupied real estate 365,706 399,370 Commercial, financial & agricultural 1,159,294 973,440 Leases 30,410 52,396 Consumer 65,635 66,906 Total loans 3,637,334 3,532,193 Allowance for loan and lease losses (34,789 ) (28,750 ) Total loans, net $ 3,602,545 $ 3,503,443 Organic loans, net of related discounts, are summarized as follows (dollars in thousands) : Organic Loans September 30, 2018 December 31, 2017 Construction, land & land development $ 480,530 $ 412,540 Other commercial real estate 939,258 949,594 Total commercial real estate 1,419,788 1,362,134 Residential real estate 238,292 196,225 Owner-occupied real estate 275,095 260,273 Commercial, financial & agricultural 758,897 430,205 Leases 30,410 52,396 Consumer 64,361 64,610 Total organic loans (1) 2,786,843 2,365,843 Allowance for loan and lease losses (27,427 ) (24,039 ) Total organic loans, net $ 2,759,416 $ 2,341,804 (1) Includes net deferred loan fees that totaled approximately $10.3 million and $9.3 million at September 30, 2018 and December 31, 2017 , respectively. Purchased non-credit impaired loans ("PNCI loans"), net of related discounts, are summarized as follows (dollars in thousands) : Purchased Non-Credit Impaired Loans September 30, 2018 December 31, 2017 Construction, land & land development $ 13,284 $ 25,908 Other commercial real estate 186,556 218,660 Total commercial real estate 199,840 244,568 Residential real estate 61,141 96,529 Owner-occupied real estate 73,466 118,294 Commercial, financial & agricultural 390,097 529,184 Consumer 1,197 2,161 Total purchased non-credit impaired loans (1) 725,741 990,736 Allowance for loan and lease losses (3,389 ) (995 ) Total purchased non-credit impaired loans, net $ 722,352 $ 989,741 (1) Includes net discounts that totaled approximately $6.1 million and $12.7 million at September 30, 2018 and December 31, 2017 , respectively. Purchased credit impaired loans ("PCI loans"), net of related discounts, are summarized as follows (dollars in thousands) : Purchased Credit Impaired Loans September 30, 2018 December 31, 2017 Construction, land & land development $ 6,281 $ 13,545 Other commercial real estate 60,910 86,748 Total commercial real estate 67,191 100,293 Residential real estate 30,037 40,332 Owner-occupied real estate 17,145 20,803 Commercial, financial & agricultural 10,300 14,051 Consumer 77 135 Total purchased credit impaired loans 124,750 175,614 Allowance for loan and lease losses (3,973 ) (3,716 ) Total purchased credit impaired loans, net $ 120,777 $ 171,898 Changes in the carrying value of purchased credit impaired loans are presented in the following table for the periods presented (dollars in thousands) : Three Months Ended Nine Months Ended September 30 September 30 Purchased Credit Impaired Loans 2018 2017 2018 2017 Balance, beginning of period $ 144,474 $ 130,837 $ 171,898 $ 155,573 Accretion of fair value discounts 8,154 6,520 20,695 23,425 Fair value of acquired loans — 77,551 — 77,551 Reductions in principal balances resulting from repayments, write-offs and foreclosures (31,866 ) (16,009 ) (71,559 ) (57,962 ) Change in the allowance for loan and lease losses on purchased credit impaired loans 15 1,528 (257 ) 1,840 Balance, end of period $ 120,777 $ 200,427 $ 120,777 $ 200,427 Purchased credit impaired loans are initially recorded at fair value at the acquisition date. The Company re-estimates expected cash flows on purchased credit impaired loans on a quarterly basis. 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 first 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 on purchased credit impaired loans are presented in the following table for the periods presented (dollars in thousands) : Three Months Ended Nine Months Ended September 30 September 30 Changes in Accretable Discount 2018 2017 2018 2017 Balance, beginning of period $ 53,538 $ 59,808 $ 57,927 $ 69,301 Additions from acquisitions — 11,664 — 11,664 Accretion (8,154 ) (6,520 ) (20,695 ) (23,425 ) Transfers to accretable discounts and exit events, net 515 2,244 8,667 9,656 Balance, end of period $ 45,899 $ 67,196 $ 45,899 $ 67,196 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 purchased credit impaired loans. At September 30, 2018 and December 31, 2017 , loans with a carrying value of $3.1 billion were pledged for lines of credit. At September 30, 2018 , consumer mortgage loans secured by residential real estate properties totaling $20,000 were in formal foreclosure proceedings.

Allowance for Loan and Lease Lo

Allowance for Loan and Lease Losses (ALLL)	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Allowance for Loan and Lease Losses (ALLL)	NOTE 6: ALLOWANCE FOR LOAN AND LEASE LOSSES (ALLL) The following tables summarize the Company's allowance for loan and lease losses for the periods indicated (dollars in thousands) : Three Months Ended September 30 2018 2017 Organic Loans Purchased Non-Credit Impaired Loans Purchased Credit Impaired Loans Total Organic Loans Purchased Non-Credit Impaired Loans Purchased Credit Impaired Loans Total Balance, beginning of period $ 26,366 $ 2,981 $ 3,988 $ 33,335 $ 22,560 $ 667 $ 4,761 $ 27,988 Charge-offs (326 ) (451 ) (124 ) (901 ) (912 ) (152 ) (643 ) (1,707 ) Recoveries 87 59 — 146 106 40 — 146 Net (charge-offs) recoveries (239 ) (392 ) (124 ) (755 ) (806 ) (112 ) (643 ) (1,561 ) Provision for loan and lease losses 1,300 800 109 2,209 955 345 (885 ) 415 Balance, end of period $ 27,427 $ 3,389 $ 3,973 $ 34,789 $ 22,709 $ 900 $ 3,233 $ 26,842 Nine Months Ended September 30 2018 2017 Organic Loans Purchased Non-Credit Impaired Loans Purchased Credit Impaired Loans Total Organic Loans Purchased Non-Credit Impaired Loans Purchased Credit Impaired Loans Total Balance, beginning of period $ 24,039 $ 995 $ 3,716 $ 28,750 $ 21,086 $ 439 $ 5,073 $ 26,598 Charge-offs (1,161 ) (776 ) (247 ) (2,184 ) (1,988 ) (397 ) (971 ) (3,356 ) Recoveries 290 123 — 413 296 42 — 338 Net (charge-offs) recoveries (871 ) (653 ) (247 ) (1,771 ) (1,692 ) (355 ) (971 ) (3,018 ) Provision for loan and lease losses 4,259 3,047 504 7,810 3,315 816 (869 ) 3,262 Balance, end of period $ 27,427 $ 3,389 $ 3,973 $ 34,789 $ 22,709 $ 900 $ 3,233 $ 26,842 Activity in the allowance for loan and lease losses on organic loans is detailed as follows by portfolio segment for the periods indicated (dollars in thousands) : Organic Loans Commercial Real Estate Residential Real Estate Owner-Occupied Real Estate Commercial, Financial & Agricultural Leases Consumer Total Three Months Ended September 30, 2018 Beginning balance $ 12,154 $ 2,412 $ 2,954 $ 7,438 $ 411 $ 997 $ 26,366 Charge-offs — (28 ) — (201 ) (39 ) (58 ) (326 ) Recoveries 1 14 — 50 4 18 87 Provision (668 ) 88 496 1,664 (31 ) (249 ) 1,300 Ending balance $ 11,487 $ 2,486 $ 3,450 $ 8,951 $ 345 $ 708 $ 27,427 Nine Months Ended September 30, 2018 Beginning balance $ 13,037 $ 2,809 $ 2,075 $ 4,535 $ 629 $ 954 $ 24,039 Charge-offs (277 ) (240 ) — (360 ) (119 ) (165 ) (1,161 ) Recoveries 21 24 — 156 37 52 290 Provision (1,294 ) (107 ) 1,375 4,620 (202 ) (133 ) 4,259 Ending balance $ 11,487 $ 2,486 $ 3,450 $ 8,951 $ 345 $ 708 $ 27,427 Three Months Ended September 30, 2017 Beginning balance $ 13,337 $ 1,841 $ 2,036 $ 3,663 $ 825 $ 858 $ 22,560 Charge-offs (746 ) — — (98 ) (2 ) (66 ) (912 ) Recoveries — 3 — 20 67 16 106 Provision 469 132 374 97 (194 ) 77 955 Ending balance $ 13,060 $ 1,976 $ 2,410 $ 3,682 $ 696 $ 885 $ 22,709 Nine Months Ended September 30, 2017 Beginning balance $ 11,767 $ 1,786 $ 2,239 $ 4,093 $ 655 $ 546 $ 21,086 Charge-offs (933 ) (48 ) — (240 ) (501 ) (266 ) (1,988 ) Recoveries — 9 — 71 176 40 296 Provision 2,226 229 171 (242 ) 366 565 3,315 Ending balance $ 13,060 $ 1,976 $ 2,410 $ 3,682 $ 696 $ 885 $ 22,709 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 September 30, 2018 Commercial real estate $ — $ 11,487 $ 11,487 $ 2,799 $ 1,416,989 $ 1,419,788 Residential real estate — 2,486 2,486 1,333 236,959 238,292 Owner-occupied real estate 25 3,425 3,450 3,456 271,639 275,095 Commercial, financial & agricultural 108 8,843 8,951 5,917 752,980 758,897 Leases — 345 345 — 30,410 30,410 Consumer — 708 708 — 64,361 64,361 Total organic loans $ 133 $ 27,294 $ 27,427 $ 13,505 $ 2,773,338 $ 2,786,843 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 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 indicated (dollars in thousands) : Purchased Non-Credit Impaired Loans Commercial Real Estate Residential Real Estate Owner-Occupied Real Estate Commercial, Financial & Agricultural Consumer Total Three Months Ended September 30, 2018 Beginning balance $ 292 $ 334 $ 441 $ 1,910 $ 4 $ 2,981 Charge-offs (406 ) (44 ) — — (1 ) (451 ) Recoveries 23 8 9 18 1 59 Provision 439 (42 ) 30 375 (2 ) 800 Ending balance $ 348 $ 256 $ 480 $ 2,303 $ 2 $ 3,389 Nine Months Ended September 30, 2018 Beginning balance $ 230 $ 664 $ 88 $ 8 $ 5 $ 995 Charge-offs (406 ) (80 ) (249 ) (37 ) (4 ) (776 ) Recoveries 30 18 30 42 3 123 Provision 494 (346 ) 611 2,290 (2 ) 3,047 Ending balance $ 348 $ 256 $ 480 $ 2,303 $ 2 $ 3,389 Three Months Ended September 30, 2017 Beginning balance $ 145 $ 342 $ 152 $ 26 $ 2 $ 667 Charge-offs (50 ) (7 ) — (91 ) (4 ) (152 ) Recoveries 1 5 — 32 2 40 Provision 93 120 68 61 3 345 Ending balance $ 189 $ 460 $ 220 $ 28 $ 3 $ 900 Nine Months Ended September 30, 2017 Beginning balance $ 88 $ 72 $ 44 $ 235 $ — $ 439 Charge-offs (50 ) (7 ) (80 ) (251 ) (9 ) (397 ) Recoveries 1 5 — 32 4 42 Provision 150 390 256 12 8 816 Ending balance $ 189 $ 460 $ 220 $ 28 $ 3 $ 900 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 dates 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 September 30, 2018 Commercial real estate $ — $ 348 $ 348 $ — $ 199,840 $ 199,840 Residential real estate — 256 256 181 60,960 61,141 Owner-occupied real estate 24 456 480 823 72,643 73,466 Commercial, financial & agricultural 629 1,674 2,303 55,668 334,429 390,097 Consumer — 2 2 — 1,197 1,197 Total purchased non-credit impaired loans $ 653 $ 2,736 $ 3,389 $ 56,672 $ 669,069 $ 725,741 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 Activity in the allowance for loan and lease losses on purchased credit impaired loans is detailed as follows by portfolio segment for the periods indicated (dollars in thousands) : Purchased Credit Impaired Loans Commercial Real Estate Residential Real Estate Owner-Occupied Real Estate Commercial, Financial & Agricultural Consumer Total Three Months Ended September 30, 2018 Beginning balance $ 2,172 $ 786 $ 816 $ 214 $ — $ 3,988 Charge-offs — (1 ) (123 ) — — (124 ) Recoveries — — — — — — Provision (379 ) 380 112 (4 ) — 109 Ending balance $ 1,793 $ 1,165 $ 805 $ 210 $ — $ 3,973 Nine Months Ended September 30, 2018 Beginning balance $ 1,706 $ 1,242 $ 718 $ 42 $ 8 $ 3,716 Charge-offs (34 ) (74 ) (133 ) — (6 ) (247 ) Recoveries — — — — — — Provision 121 (3 ) 220 168 (2 ) 504 Ending balance $ 1,793 $ 1,165 $ 805 $ 210 $ — $ 3,973 Three Months Ended September 30, 2017 Beginning balance $ 2,131 $ 968 $ 1,611 $ 37 $ 14 $ 4,761 Charge-offs (168 ) (50 ) (416 ) (6 ) (3 ) (643 ) Recoveries — — — — — — Provision (506 ) 310 (697 ) 5 3 (885 ) Ending balance $ 1,457 $ 1,228 $ 498 $ 36 $ 14 $ 3,233 Nine Months Ended September 30, 2017 Beginning balance $ 2,183 $ 1,196 $ 1,655 $ 38 $ 1 $ 5,073 Charge-offs (401 ) (92 ) (452 ) (22 ) (4 ) (971 ) Recoveries — — — — — — Provision (325 ) 124 (705 ) 20 17 (869 ) Ending balance $ 1,457 $ 1,228 $ 498 $ 36 $ 14 $ 3,233 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 September 30, 2018 Commercial real estate $ 996 $ 797 $ 1,793 $ 55,816 $ 11,375 $ 67,191 Residential real estate 68 1,097 1,165 2,257 27,780 30,037 Owner-occupied real estate 695 110 805 7,539 9,606 17,145 Commercial, financial & agricultural 5 205 210 52 10,248 10,300 Consumer — — — — 77 77 Total purchased credit impaired loans $ 1,764 $ 2,209 $ 3,973 $ 65,664 $ 59,086 $ 124,750 December 31, 2017 Commercial real estate $ 1,052 $ 654 $ 1,706 $ 79,085 $ 21,208 $ 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 $ 93,915 $ 81,699 $ 175,614 Impaired loans, segregated by class of loans, are presented in the following table (dollars in thousands) : September 30, 2018 December 31, 2017 Unpaid Principal Balance Recorded Investment Related Allowance Unpaid Principal Balance Recorded Investment Related Allowance Impaired Loans (1) With no related allowance recorded: Construction, land & land development $ 26 $ 23 $ — $ 82 $ 79 $ — Other commercial real estate 2,801 2,799 — 4,617 3,822 — Total commercial real estate 2,827 2,822 — 4,699 3,901 — Residential real estate 2,579 2,345 — 453 456 — Owner-occupied real estate 1,620 1,554 — 4,172 4,015 — Commercial, financial & agricultural 44,851 42,844 — 2,739 1,882 — Consumer 30 22 — 51 40 — Subtotal 51,907 49,587 — 12,114 10,294 — With related allowance recorded: Construction, land & land development 178 177 88 113 112 56 Other commercial real estate — — — — — — Total commercial real estate 178 177 88 113 112 56 Residential real estate 694 619 310 1,452 1,399 699 Owner-occupied real estate 3,544 3,411 331 350 335 125 Commercial, financial & agricultural 20,376 20,160 1,303 872 821 318 Consumer 261 73 36 83 81 40 Subtotal 25,053 24,440 2,068 2,870 2,748 1,238 Total impaired loans $ 76,960 $ 74,027 $ 2,068 $ 14,984 $ 13,042 $ 1,238 (1) Includes loans with SBA guaranteed balances of $5.0 million and $5.7 million at September 30, 2018 and December 31, 2017 , 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) : September 30, 2018 September 30, 2017 Impaired Loans Average Recorded Investment (1) Interest Income Recognized (2) Average Recorded Investment (1) Interest Income Recognized (2) Three Months Ended Construction, land & land development $ 202 $ — $ 146 $ — Other commercial real estate 2,800 — 4,347 — Total commercial real estate 3,002 — 4,493 — Residential real estate 3,274 — 1,120 — Owner-occupied real estate 5,021 — 3,446 — Commercial, financial & agricultural 62,768 548 2,653 — Consumer 100 — 87 — Total impaired loans $ 74,165 $ 548 $ 11,799 $ — Nine Months Ended Construction, land & land development $ 156 $ — $ 2,862 $ — Other commercial real estate 3,172 16 4,558 — Total commercial real estate 3,328 16 7,420 — Residential real estate 3,824 — 1,154 — Owner-occupied real estate 4,406 — 3,500 — Commercial, financial & agricultural 48,672 1,575 2,761 1 Consumer 121 — 94 — Total impaired loans $ 60,351 $ 1,591 $ 14,929 $ 1 (1) The average recorded investment for troubled debt restructurings was $6.4 million and $6.8 million for the three and nine months ended September 30, 2018 , respectively, and was $0 and $2.7 million for the three and nine months ended September 30, 2017 , respectively. (2) The interest income recognized on troubled debt restructurings was $60,000 and $191,000 for the three and nine months ended September 30, 2018 , respectively, and was $0 for both the three and nine months ended September 30, 2017 . The following table presents the recorded investment in nonaccrual loans by loan class at the dates indicated (dollars in thousands) : Nonaccrual Loans September 30, 2018 December 31, 2017 Construction, land & land development $ 200 $ 191 Other commercial real estate 2,799 3,257 Total commercial real estate 2,999 3,448 Residential real estate 2,964 1,855 Owner-occupied real estate 4,965 4,350 Commercial, financial & agricultural 21,832 2,703 Consumer 95 121 Total nonaccrual loans $ 32,855 $ 12,477 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 September 30, 2018 Construction, land & land development $ 186 $ 130 $ 316 $ 480,214 $ 480,530 $ — Other commercial real estate — — — 939,258 939,258 — Total commercial real estate 186 130 316 1,419,472 1,419,788 — Residential real estate 960 50 1,010 237,282 238,292 — Owner-occupied real estate 4,761 967 5,728 269,367 275,095 — Commercial, financial & agricultural 1,749 535 2,284 756,613 758,897 — Leases — — — 30,410 30,410 — Consumer 58 22 80 64,281 64,361 — Total organic loans $ 7,714 $ 1,704 $ 9,418 $ 2,777,425 $ 2,786,843 $ — 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 $ — 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 September 30, 2018 Construction, land & land development $ — $ — $ — $ 13,284 $ 13,284 $ — Other commercial real estate — — — 186,556 186,556 — Total commercial real estate — — — 199,840 199,840 — Residential real estate 326 45 371 60,770 61,141 — Owner-occupied real estate 156 — 156 73,310 73,466 — Commercial, financial & agricultural 18,848 391 19,239 370,858 390,097 — Consumer — 18 18 1,179 1,197 — Total purchased non-credit impaired loans $ 19,330 $ 454 $ 19,784 $ 705,957 $ 725,741 $ — 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 $ — 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 September 30, 2018 Construction, land & land development $ 11 $ 1,765 $ 1,776 $ 4,505 $ 6,281 Other commercial real estate 36 2,377 2,413 58,497 60,910 Total commercial real estate 47 4,142 4,189 63,002 67,191 Residential real estate 975 1,186 2,161 27,876 30,037 Owner-occupied real estate 416 140 556 16,589 17,145 Commercial, financial & agricultural — 1,427 1,427 8,873 10,300 Consumer — — — 77 77 Total purchased credit impaired loans $ 1,438 $ 6,895 $ 8,333 $ 116,417 $ 124,750 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 For each period indicated, a 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. 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 September 30, 2018 Construction, land & land development $ 453,014 $ 20,906 $ 6,350 $ 130 $ 130 $ 480,530 Other commercial real estate 902,471 33,420 556 2,811 — 939,258 Total commercial real estate 1,355,485 54,326 6,906 2,941 130 1,419,788 Residential real estate 230,722 4,254 401 2,915 — 238,292 Owner-occupied real estate 236,779 30,673 667 6,976 — 275,095 Commercial, financial & agricultural 673,850 76,901 1,096 7,050 — 758,897 Leases 28,749 1,661 — — — 30,410 Consumer 64,163 125 — 73 — 64,361 Total organic loans $ 2,589,748 $ 167,940 $ 9,070 $ 19,955 $ 130 $ 2,786,843 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 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 September 30, 2018 Construction, land & land development $ 13,217 $ 43 $ — $ 24 $ — $ 13,284 Other commercial real estate 145,202 39,078 1,752 524 — 186,556 Total commercial real estate 158,419 39,121 1,752 548 — 199,840 Residential real estate 58,406 1,297 153 1,212 73 61,141 Owner-occupied real estate 65,546 4,627 — 3,293 — 73,466 Commercial, financial & agricultural 258,546 63,524 29,475 38,552 — 390,097 Consumer 1,144 6 — 29 18 1,197 Total purchased non-credit impaired loans $ 542,061 $ 108,575 $ 31,380 $ 43,634 $ 91 $ 725,741 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 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 (dollars in thousands) : Purchased Credit Impaired Loans Pass Watch OAEM Substandard Doubtful Total September 30, 2018 Construction, land & land development $ 869 $ 581 $ 908 $ 3,923 $ — $ 6,281 Other commercial real estate 33,835 15,631 1,261 10,183 — 60,910 Total commercial real estate 34,704 16,212 2,169 14,106 — 67,191 Residential real estate 15,133 5,747 553 8,538 66 30,037 Owner-occupied real estate 7,045 2,897 1,716 5,487 — 17,145 Commercial, financial & agricultural 6 110 5,030 5,154 — 10,300 Consumer 29 24 18 6 — 77 Total purchased credit impaired loans $ 56,917 $ 24,990 $ 9,486 $ 33,291 $ 66 $ 124,750 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 Troubled Debt Restructurings (TDRs) Total troubled debt restructurings (TDRs) were $6.4 million at September 30, 2018 , with $24,000 in related allowance. At December 31, 2017 , TDRs totaled $1.5 million with no related allowance. At September 30, 2018 , there was one commitment to extend credit to a borrower with an existing troubled debt restructuring totaling $7,000 . At December 31, 2017 , there were no commitments to extend credit to borrowers 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 loans that were modified as TDRs during the periods presented (dollars in thousands) : September 30, 2018 September 30, 2017 TDR Additions (1) Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Nine Months Ended Construction, land & land development — $ — $ — — $ — $ — Other commercial real estate 2 2,801 2,801 — — — Total commercial real estate 2 2,801 2,801 — — — Commercial & industrial — — — — — — Owner-occupied real estate — — — — — — Residential real estate 1 2,769 2,769 — — — Consumer & Other — — — — — — Total modifications 3 $ 5,570 $ 5,570 — $ — $ — (1) The pre-modification and post-modification recorded investment amount represents the recorded investment on the date of the loan modification. Since the modifications on these loans were either an interest rate concession or payment term extension, not principal reductions, the pre-modification and post-modification recorded investment amount is the same. There were no loans modified as a TDR during the three months ended September 30, 2018 or 2017 . During the nine months ended September 30, 2018 , there was one loan modified as a TDR which subsequently defaulted within twelve months of its modification date with a recorded investment of $823,000 . During the nine months ended September 30, 2017 , there were no TDRs that subsequently defaulted within twelve months of their modification dates.

SBA Servicing Rights

SBA Servicing Rights	9 Months Ended
	Sep. 30, 2018
Transfers and Servicing [Abstract]
SBA Servicing Rights	NOTE 7: 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 three and nine months ended September 30, 2018 , the Company sold SBA loans with unpaid principal balances totaling $15.2 million and $33.6 million , respectively, and recognized $1.3 million and $3.2 million in gains on the loan sales, respectively. During the three and nine months ended September 30, 2017 , the Company sold SBA loans with unpaid principal balances totaling $10.1 million and $35.1 million , respectively, and recognized $1.2 million and $3.6 million in gains on the loan sales, respectively. 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 $454,000 and $1.4 million for the three and nine months ended September 30, 2018 , respectively. SBA servicing fees totaled $389,000 and $1.2 million for the three and nine months ended September 30, 2017 , respectively. At September 30, 2018 and December 31, 2017 , the Company serviced SBA loans for others with unpaid principal balances totaling $195.9 million and $185.6 million , respectively. The table below summarizes the activity in the SBA servicing rights asset for the periods presented (dollars in thousands) : Three Months Ended Nine Months Ended September 30 September 30 SBA Servicing Rights 2018 2017 2018 2017 Balance, beginning of period $ 3,989 $ 3,828 $ 4,069 $ 3,477 Additions 325 253 738 850 Fair value adjustments (472 ) (131 ) (965 ) (377 ) Balance, end of period $ 3,842 $ 3,950 $ 3,842 $ 3,950 The fair value of the SBA servicing rights asset, key metrics, and the sensitivity of the fair value due to adverse changes in key economic assumptions at the periods presented are as follows (dollars in thousands) : SBA Servicing Rights September 30, 2018 December 31, 2017 Fair value $ 3,842 $ 4,069 Weighted average discount rate 13.4 % 12.9 % Decline in fair value due to a 100 basis point adverse change $ (119 ) $ (140 ) Decline in fair value due to a 200 basis point adverse change (232 ) (272 ) Prepayment speed 11.9 % 9.1 % Decline in fair value due to a 10% adverse change $ (162 ) $ (141 ) Decline in fair value due to a 20% adverse change (313 ) (275 ) Weighted average remaining life (years) 5.5 6.7 The sensitivity calculations above are hypothetical and should not be considered to be predictive of future performance. As indicated, changes in fair value based on adverse changes in model inputs and/or assumptions generally cannot be extrapolated because the relationship of the change in input or assumption to the change in fair value may not be linear. In addition, the effect of an adverse variation in a particular input or assumption on the value of the SBA servicing rights is calculated without changing any other input or assumption. In reality, changes in one factor may magnify or counteract the effect of the change. 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 are as follows (dollars in thousands) : September 30, 2018 SBA Loans Serviced Unpaid Principal Balance 30 - 89 Days Past Due 90 Days or Greater Past Due Net Charge-offs for the Nine Months Ended September 30, 2018 Serviced for others $ 195,926 $ 72 $ — $ — Held-for-sale 17,382 — — — Held-for-investment 159,964 4,137 4,968 104 Total SBA loans serviced $ 373,272 $ 4,209 $ 4,968 $ 104 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 Nine Months Ended September 30, 2017 Serviced for others $ 185,557 $ 1,555 $ — $ — Held-for-sale 10,420 — — — Held-for-investment 153,810 2,508 6,627 454 Total SBA loans serviced $ 349,787 $ 4,063 $ 6,627 $ 454

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS & HEDGING ACTIVITIES	NOTE 8: DERIVATIVE 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 into a 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 9 , 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 September 30, 2018 , 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 presented (dollars in thousands) : Derivative Assets (1) Derivative Liabilities (1) September 30, 2018 December 31, 2017 September 30, 2018 December 31, 2017 Derivatives Designated as Hedging Instruments Interest rate swaps and caps $ 4,656 $ 2,011 $ — $ 116 Total $ 4,656 $ 2,011 $ — $ 116 Derivatives Not Designated as Hedging Instruments Mortgage derivatives $ — $ 616 $ — $ 238 Total $ — $ 616 $ — $ 238 (1) All derivative assets are located in "Other Assets" on the consolidated statements of financial condition and all derivative liabilities are located in "Other Liabilities" on the consolidated statements of financial condition. The tables below presents the effect of fair value and cash flow hedge accounting on the consolidated statements of income for the periods presented (dollars in thousands) : Three Months Ended September 30 2018 2017 Interest Income Interest Expense Noninterest Income Interest Income Interest Expense Noninterest Income Total amounts of income and expense line items presented in the consolidated statements of income $ 66,624 $ 8,039 $ 9,738 $ 47,702 $ 3,370 $ 9,682 Gain (loss) on fair value hedging relationships in Subtopic 815-20 Interest rate swaps: Hedged items (457 ) — — — — (55 ) Derivatives designated as hedging instruments 434 — — — — 3 Gain (loss) on cash flow hedging relationships in Subtopic 815-20 Interest rate caps: Amount of loss reclassified from accumulated other comprehensive loss into income — — — — 379 — Nine Months Ended September 30 2018 2017 Interest Income Interest Expense Noninterest Income Interest Income Interest Expense Noninterest Income Total amounts of income and expense line items presented in the consolidated statements of income $ 190,873 $ 21,302 $ 31,116 $ 144,746 $ 9,978 $ 29,617 Gain (loss) on fair value hedging relationships in Subtopic 815-20 Interest rate swaps: Hedged items (2,773 ) — — — — (138 ) Derivatives designated as hedging instruments 2,961 — — — — 35 Gain (loss) on cash flow hedging relationships in Subtopic 815-20 Interest rate caps: Amount of loss reclassified from accumulated other comprehensive loss into income — 91 — — 1,213 — 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 September 30, 2018 and December 31, 2017 , the Company had 67 and 84 interest rate swaps with an aggregate notional amount of $115.4 million and $141.9 million , designated as fair value hedges associated with the Company's fixed rate loan program. The tables below presents the effect of fair value hedges on the consolidated statements of financial condition for the periods presented (dollars in thousands) : Line Item in the Statement of Financial Condition in Which the Hedged Item Is Included Carrying Amount of the Hedged Asset Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Asset September 30, 2018 December 31, 2017 September 30, 2018 December 31, 2017 Loans $ 108,206 $ 139,391 $ (4,528 ) $ (1,892 ) Total $ 108,206 $ 139,391 $ (4,528 ) $ (1,892 ) Cash Flow Hedges The Company used 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 former cash flow hedges were for the purpose of capping interest rates paid on deposits, which protected 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 . These caps expired in the first quarter of 2018. Amounts reported in AOCI related to derivatives were reclassified to interest expense as the interest rate cap premium was amortized over the life of the cap. The table below presents the effect of the Company's derivatives in cash flow hedging relationships for the periods presented (dollars in thousands) : Three Months Ended Nine Months Ended September 30 September 30 Interest Rate Products Location 2018 2017 2018 2017 Amount of (loss) gain recognized in AOCI on derivatives OCI $ — $ (30 ) $ (4 ) $ 50 Amount of loss reclassified from AOCI into income Interest expense — 379 91 1,213 Amount of loss recognized in consolidated statements of comprehensive income $ — $ (409 ) $ (95 ) $ (1,163 ) Derivatives Not Designated as Hedging Instruments Interest Rate Swaps At September 30, 2018 , the Company had no interest rate swaps that were not designated as fair value hedges associated with the Company's fixed rate loan program and recognized no related income statement impact during the three and nine months ended September 30, 2018 . For the three and nine months ended September 30, 2017 , there were net losses of $68,000 and $124,000 , respectively, recorded in the income statement for the interest rate swaps not designated as hedging instruments. 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 September 30, 2018 and December 31, 2017 , the fair value of mortgage derivative assets was $0 and $616,000 , respectively, and the fair value of mortgage derivative liabilities was $0 and $238,000 , respectively. At September 30, 2018 and December 31, 2017 , the Company had approximately $0 and $36.3 million , respectively, of interest rate lock commitments, and $0 and $55.8 million , respectively, of forward commitments for the future delivery of residential mortgage loans. The net loss related to interest rate lock commitments for the three months ended September 30, 2018 was $849,000 , compared to a loss of $79,000 for the same period in 2017 . The net loss related to interest rate lock commitments for the nine months ended September 30, 2018 was $307,000 , compared to a gain of $250,000 for the same period in 2017 . The net gain for forward commitments related to these mortgage loans was $535,000 for the three months ended September 30, 2018 , compared to a net loss of $66,000 for the same period in 2017 . The net losses for forward commitments were $71,000 and $748,000 for the nine months ended September 30, 2018 and 2017 , respectively. The table below presents the effect of the Company's derivatives not designated as hedging instruments for the periods presented (dollars in thousands) : Three Months Ended Nine Months Ended September 30 September 30 Interest Rate Products Location 2018 2017 2018 2017 Amount of loss recognized in income on interest rate swaps Noninterest income $ — $ (68 ) $ — $ (124 ) Amount of (loss) gain recognized in income on interest rate lock commitments Noninterest income (849 ) (79 ) (307 ) 250 Amount of gain (loss) gain recognized in income on forward commitments Noninterest income 535 (66 ) (71 ) (748 ) Total loss recognized in income on derivatives not designated as hedging instruments $ (314 ) $ (213 ) $ (378 ) $ (622 )

Balance Sheet Offsetting and Re

Balance Sheet Offsetting and Repurchase Agreements	9 Months Ended
	Sep. 30, 2018
Offsetting [Abstract]
Balance Sheet Offsetting and Repurchase Agreements	NOTE 9: BALANCE SHEET OFFSETTING AND REPURCHASE AGREEMENTS 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) September 30, 2018 Offsetting Assets Interest rate swaps and caps $ 4,656 $ — $ 4,656 $ — $ (4,502 ) $ 154 Offsetting Liabilities Interest rate swaps and caps $ — $ — $ — $ — $ — $ — Repurchase agreements 33,621 — 33,621 — (33,621 ) — Total liabilities $ 33,621 $ — $ 33,621 $ — $ (33,621 ) $ — December 31, 2017 Offsetting Assets Interest rate swaps and caps $ 2,011 $ — $ 2,011 $ (116 ) $ (1,895 ) $ — Offsetting 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 ) $ — (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. Repurchase Agreements The Company utilizes securities sold under repurchase agreements to facilitate the needs of its 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 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 a safekeeping agent. At September 30, 2018 and December 31, 2017 , securities sold under repurchase agreements were $33.6 million and $25.2 million , respectively, all of which mature on an overnight and continuous basis. At both September 30, 2018 and December 31, 2017 , investment securities pledged for the outstanding repurchase agreements consisted of U.S. government sponsored agency mortgage-backed securities.

Regulatory Matters

Regulatory Matters	9 Months Ended
	Sep. 30, 2018
Banking and Thrift [Abstract]
Regulatory Matters	NOTE 10: REGULATORY MATTERS Regulatory Capital Requirements 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 2018 is common equity equal to 1.875% 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 both September 30, 2018 and December 31, 2017 are presented in the table below: Capital Ratio Requirements Minimum Requirement Well-capitalized (1) Common Equity Tier 1 (CET1) capital ratio 4.50% 6.50% Tier 1 risk-based capital ratio 6.00% 8.00% Total risk-based capital ratio 8.00% 10.00% Tier 1 leverage ratio 4.00% 5.00% (1) The prompt corrective action provisions are only applicable at the bank level. At September 30, 2018 and December 31, 2017 , 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) : September 30, 2018 December 31, 2017 Actual Required Actual Required Amount Ratio Minimum Amount Amount Ratio Minimum Amount Company Common Equity Tier 1 (CET1) capital ratio $ 579,770 12.89 % $ 202,409 $ 547,822 12.61 % $ 195,433 Tier 1 risk-based capital ratio 579,770 12.89 % 269,878 547,822 12.61 % 260,578 Total risk-based capital ratio 614,559 13.66 % 359,838 576,572 13.28 % 347,437 Tier 1 leverage ratio 579,770 11.85 % 195,697 547,822 11.24 % 194,924 State Bank's regulatory ratios at the dates indicated are presented in the table below (dollars in thousands) : September 30, 2018 December 31, 2017 Actual Required Actual Required Amount Ratio Minimum Amount Well Capitalized Amount Amount Ratio Minimum Amount Well Capitalized Amount State Bank Common Equity Tier 1 (CET1) capital ratio $ 515,147 11.45 % $ 202,547 $ 292,567 $ 481,135 11.10 % $ 194,972 $ 281,626 Tier 1 risk-based capital ratio 515,147 11.45 % 270,062 360,083 481,135 11.10 % 259,962 346,617 Total risk-based capital ratio 549,936 12.22 % 360,083 450,104 509,885 11.77 % 346,617 433,271 Tier 1 leverage ratio 515,147 10.54 % 195,430 244,288 481,135 9.90 % 194,429 243,037 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 banks may distribute without prior regulatory approval. At September 30, 2018 , State Bank had no capacity to pay dividends to the Company without prior regulatory approval. At September 30, 2018 , the Company had $65.1 million in cash and due from bank accounts, which can be used for additional capital as needed by State Bank, payment of holding company expenses, payment of dividends to shareholders, or for other corporate purposes.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	NOTE 11: 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 we do for on-balance-sheet instruments. A summary of the Company's commitments is as follows (dollars in thousands) : September 30, 2018 December 31, 2017 Commitments to extend credit: Fixed $ 99,290 $ 65,117 Variable 966,924 914,524 Letters of credit: Fixed 5,628 5,978 Variable 6,998 11,428 Total commitments $ 1,078,840 $ 997,047 The fixed rate loan commitments have maturities ranging from one month to twelve 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 maintains a recourse liability for mortgage loans sold to investors. At September 30, 2018 , the recourse liability was $280,000 . 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.

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value	NOTE 12: 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 nine months ended September 30, 2018 and the year ended December 31, 2017 , 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 made the election to record 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. 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 September 30, 2018 , 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. Interest income is recorded in interest income on the consolidated statements of income and is based on the contractual terms of the loan. None of these loans were 90 days or more past due or on nonaccrual at September 30, 2018 . At September 30, 2018 , the aggregate fair value of the Company's mortgage loans held-for-sale was $13.3 million and the contractual balance including accrued interest was $13.0 million , with a fair value mark totaling $292,000 . The Company recognized a loss of $869,000 and a loss of $252,000 for the three and nine months ended September 30, 2018 , respectively, related to the change in fair value of the mortgage loans held-for-sale, included in "mortgage banking income" on the consolidated statements of income. For the three and nine months ended September 30, 2017 , the amount recognized related to the change in fair value of the mortgage loans held-for-sale was a gain of $63,000 and a gain of $545,000 , respectively. Derivative Financial Instruments Interest Rate 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. Please reference Note 7 for the roll-forward of the SBA servicing rights asset at fair value utilizing level 3 inputs. The following tables present 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) : September 30, 2018 Quoted Market Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: Equity securities - financial services industry $ — $ 1,515 $ — $ 1,515 U.S. Government securities — 66,698 — 66,698 Residential mortgage-backed securities — nonagency — 82,707 — 82,707 Residential mortgage-backed securities — agency — 507,786 — 507,786 Corporate securities — 115,178 — 115,178 Hedged loans — 108,206 — 108,206 Mortgage loans held-for-sale — 13,294 — 13,294 Interest rate swaps and caps — 4,656 — 4,656 SBA servicing rights — — 3,842 3,842 Total recurring assets at fair value $ — $ 900,040 $ 3,842 $ 903,882 December 31, 2017 Quoted Market Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: Equity securities - financial services industry $ — $ 1,515 $ — $ 1,515 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 — 108,337 — 108,337 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 Changes in the carrying value of mortgage derivatives utilizing Level 3 inputs are presented in the following tables for the periods presented (dollars in thousands) : Three Months Ended September 30 Nine Months Ended September 30 2018 2018 Mortgage Derivatives Other Assets Other Liabilities Other Assets Other Liabilities Balance, beginning of period $ 961 $ 435 $ 515 $ 200 Issuances (1) — — 1,031 740 Settlements and closed loans (1) (961 ) (435 ) (1,546 ) (940 ) Balance, end of period $ — $ — $ — $ — Three Months Ended September 30 Nine Months Ended September 30 2017 2017 Mortgage Derivatives Other Assets Other Liabilities Other Assets Other Liabilities Balance, beginning of period $ 890 $ 385 $ 699 $ 445 Issuances (1) 339 339 1,543 1,167 Settlements and closed loans (1) (492 ) (385 ) (1,505 ) (1,273 ) Balance, end of period $ 737 $ 339 $ 737 $ 339 (1) The change in fair value, recorded as a component of "mortgage banking income" on the consolidated statements of income, was a loss of $526,000 and a loss of $315,000 for the three and nine months ended September 30, 2018 , respectively. The change in fair value resulted in a loss of $107,000 and a gain of $144,000 for the three and nine months ended September 30, 2017 , respectively. 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 September 30, 2018 Impaired loans $ — $ — $ 71,959 $ 71,959 Total nonrecurring assets at fair value $ — $ — $ 71,959 $ 71,959 December 31, 2017 Impaired loans $ — $ — $ 11,804 $ 11,804 Total nonrecurring assets at fair value $ — $ — $ 11,804 $ 11,804 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 $74.0 million and $13.0 million with respective valuation allowances of $2.1 million and $1.2 million at September 30, 2018 and December 31, 2017 , 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 September 30, 2018 Other real estate owned $ — $ — $ 5,949 $ 5,949 December 31, 2017 Other real estate owned $ — $ — $ 1,204 $ 1,204 The following table is a reconciliation of the fair value measurement of other real estate owned disclosed in accordance with ASC 820 to the amount recorded on the consolidated statement of financial condition at the dates indicated (dollars in thousands) : September 30, 2018 December 31, 2017 Other real estate owned: Other real estate owned at fair value $ 5,949 $ 1,204 Estimated selling costs and other adjustments (507 ) (309 ) Other real estate owned $ 5,442 $ 895 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) : September 30, 2018 Fair Value Valuation Technique Unobservable Inputs Range (Weighted Average) SBA servicing rights $ 3,842 Discounted cash flows Discount rate 9% - 27% (13%) Prepayment speed 6% - 15% (12%) Impaired loans - collateral dependent $ 71,959 Third party appraisal Management discount for property type and recent market volatility 0% - 100% (3%) Other real estate owned $ 5,949 Third party appraisal Management discount for property type and recent market volatility 0% - 50% (3%) 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%) 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 at the dates indicated (dollars in thousands) . September 30, 2018 December 31, 2017 Fair Value Hierarchy Level Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Assets: Cash and cash equivalents Level 1 $ 207,927 $ 207,927 $ 230,877 $ 230,877 Equity securities Level 2 1,515 1,515 1,515 1,515 Investment securities available-for-sale Level 2 772,369 772,369 872,455 872,455 Investment securities held-to-maturity Level 2 & 3 13,000 13,035 32,852 33,351 Loans held-for-sale Level 2 30,676 32,160 36,211 37,580 Loans, net Level 2 & 3 3,602,545 3,624,999 3,503,443 3,513,057 Other real estate owned Level 3 5,442 5,949 895 1,204 Interest rate swaps and caps Level 2 4,656 4,656 2,011 2,011 Mortgage derivatives Levels 2 & 3 — — 616 616 SBA servicing rights Level 3 3,842 3,842 4,069 4,069 Accrued interest receivable Level 2 16,790 16,790 14,906 14,906 Federal Home Loan Bank stock Level 3 4,452 4,452 4,651 4,651 Liabilities: Deposits Level 2 $ 4,186,914 $ 4,185,897 $ 4,243,135 $ 4,237,883 Federal funds purchased and securities sold under agreements to repurchase Level 2 33,621 33,621 25,209 25,209 Notes payable Level 2 — — 398 398 Interest rate swaps and caps Level 2 — — 116 116 Mortgage derivatives Levels 2 & 3 — — 238 238 Accrued interest payable Level 2 4,856 4,856 3,750 3,750 The fair value of financial instruments not measured at fair value on a recurring or nonrecurring basis are measured using an exit price notion for periods beginning after January 1, 2018. Prior to January 1, 2018, fair value for such instruments was estimated primarily based on the net present value of future cash flows.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	NOTE 13: 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) : Three Months Ended Nine Months Ended September 30 September 30 2018 2017 2018 2017 Numerator: Net income per consolidated statements of income $ 17,955 $ 14,436 $ 54,087 $ 41,197 Net income allocated to participating securities (400 ) (389 ) (1,342 ) (1,095 ) Net income allocated to common stock $ 17,555 $ 14,047 $ 52,745 $ 40,102 Basic earnings per share computation: Net income allocated to common stock $ 17,555 $ 14,047 $ 52,745 $ 40,102 Weighted average common shares outstanding, including shares considered participating securities 39,064,072 38,969,619 39,057,314 38,928,833 Less: Average participating securities (870,973 ) (1,050,866 ) (968,936 ) (1,034,448 ) Weighted average shares 38,193,099 37,918,753 38,088,378 37,894,385 Basic earnings per share $ .46 $ .37 $ 1.38 $ 1.06 Diluted earnings per share computation: Net income allocated to common stock $ 17,555 $ 14,047 $ 52,745 $ 40,102 Weighted average common shares outstanding for basic earnings per share 38,193,099 37,918,753 38,088,378 37,894,385 Weighted average dilutive grants 18,377 44,388 22,560 49,586 Weighted average shares and dilutive potential common shares 38,211,476 37,963,141 38,110,938 37,943,971 Diluted earnings per share $ .46 $ .37 $ 1.38 $ 1.06

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income	NOTE 14: 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. Unrealized holding gains and losses on securities transferred to held-to-maturity are amortized over the estimated remaining life of the security as an adjustment to yield, offsetting the related amortization/accretion of the net premium/discount created in the transfer. The components of AOCI are reported net of related tax effects. The components of AOCI and changes in those components for the periods presented are as follows (dollars in thousands) : Debt Securities Available-for-Sale Held-to-Maturity Securities Transferred from Available-For-Sale Cash Flow Hedges (Effective Portion) Total Three Months Ended September 30, 2018 Balance, beginning of period $ (9,791 ) $ (7 ) $ — $ (9,798 ) Other comprehensive loss before income taxes: Net change in unrealized losses (3,232 ) — — (3,232 ) Amounts reclassified for net gains realized and included in earnings (181 ) — — (181 ) Transfer of unrealized gain from held-to-maturity to available-for-sale — — — — Amortization of net unrealized losses on securities transferred to held-to-maturity — 7 — 7 Income tax benefit (863 ) — — (863 ) Balance, end of period $ (12,341 ) $ — $ — $ (12,341 ) September 30, 2017 Balance, beginning of period $ (905 ) $ (131 ) $ (523 ) $ (1,559 ) Other comprehensive income before income taxes: Net change in unrealized gains (losses) 1,634 — (30 ) 1,604 Amounts reclassified for net (gains) losses realized and included in earnings (3 ) — 379 376 Amortization of net unrealized losses on securities transferred to-held-to-maturity — (4 ) — (4 ) Income tax expense 625 — 135 760 Balance, end of period $ 101 $ (135 ) $ (309 ) $ (343 ) Nine Months Ended September 30, 2018 Balance, beginning of period $ (2,523 ) $ 21 $ (65 ) $ (2,567 ) Other comprehensive loss before income taxes: Net change in unrealized losses (12,292 ) — (4 ) (12,296 ) Amounts reclassified for net (gains) losses realized and included in earnings (431 ) — 91 (340 ) Transfer of unrealized gain from held-to-maturity to available-for-sale — (51 ) — (51 ) Amortization of net unrealized losses on securities transferred to-held-to-maturity — 30 — 30 Adoption of ASU 2016-01 23 — — 23 Income tax (benefit) expense (2,882 ) — 22 (2,860 ) Balance, end of period $ (12,341 ) $ — $ — $ (12,341 ) Debt Securities Available-for-Sale Held-to-Maturity Securities Transferred from Available-For-Sale Cash Flow Hedges (Effective Portion) Total September 30, 2017 Balance, beginning of period $ (1,200 ) $ (175 ) $ (1,082 ) $ (2,457 ) Other comprehensive income before income taxes: Net change in unrealized gains 2,148 — 50 2,198 Amounts reclassified for net (gains) losses realized and included in earnings (28 ) — 1,213 1,185 Amortization of net unrealized losses on securities transferred to-held-to-maturity — 40 — 40 Income tax expense 819 — 490 1,309 Balance, end of period $ 101 $ (135 ) $ (309 ) $ (343 ) Reclassifications from AOCI into income for the periods presented are as follows (dollars in thousands) : Three Months Ended Nine Months Ended September 30 September 30 Reclassifications from AOCI into income and affected line items on Consolidated Statements of Income 2018 2017 2018 2017 Debt securities available-for-sale Gain on sale of investment securities $ 181 $ 3 $ 431 $ 28 Income tax expense (46 ) (1 ) (109 ) (11 ) Net income $ 135 $ 2 $ 322 $ 17 Cash flow hedges (effective portion) Interest expense on deposits $ — $ (379 ) $ (91 ) $ (1,213 ) Income tax benefit — 145 23 466 Net income $ — $ (234 ) $ (68 ) $ (747 )

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2018
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 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 payable 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.
Business Acquisition, Pro Forma Information	The following table presents certain pro forma information as if AloStar had been acquired on January 1, 2017 (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, 2017. Merger-related costs are not included in the pro forma statements below. Nine Months Ended September 30 2018 2017 Pro Forma Pro Forma Net interest income $ 169,571 $ 166,354 Net income 55,865 48,387 Earnings per share: Basic $ 1.43 $ 1.24 Diluted 1.43 1.24
Business Acquisition, Purchased Credit Impaired Loans Acquired	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)	9 Months Ended
	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Investment Securities Available-for-Sale	The amortized cost and fair value of debt securities classified as available-for-sale are as follows (dollars in thousands) : September 30, 2018 December 31, 2017 Debt Securities Available-for-Sale Amortized Cost Unrealized Gains Unrealized Losses Fair Value Amortized Cost Unrealized Gains Unrealized Losses Fair Value U.S. Government securities $ 67,700 $ — $ 1,002 $ 66,698 $ 70,203 $ — $ 644 $ 69,559 Residential mortgage-backed securities — nonagency 80,719 2,078 90 82,707 115,639 3,183 112 118,710 Residential mortgage-backed securities — agency 525,691 88 17,993 507,786 582,845 319 7,315 575,849 Corporate securities 114,779 1,107 708 115,178 107,115 1,299 77 108,337 Total debt securities available-for-sale $ 788,889 $ 3,273 $ 19,793 $ 772,369 $ 875,802 $ 4,801 $ 8,148 $ 872,455
Held-to-maturity Securities	The amortized cost and fair value of debt securities classified as held-to-maturity are as follows (dollars in thousands) : September 30, 2018 December 31, 2017 Debt Securities Held-to-Maturity Amortized Cost Unrealized Gains Unrealized Losses Fair Value Amortized Cost Unrealized Gains Unrealized Losses Fair Value Asset-backed securities $ 13,000 $ 37 $ 2 $ 13,035 $ 22,692 $ 259 $ — $ 22,951 Corporate securities — — — — 10,160 240 — 10,400 Total debt securities held-to-maturity $ 13,000 $ 37 $ 2 $ 13,035 $ 32,852 $ 499 $ — $ 33,351
Contractual Maturities of Available-for-Sale Securities	The amortized cost and estimated fair value of debt securities by contractual maturities are summarized in the tables below (dollars in thousands) : Debt Securities Available-for-Sale Distribution of Maturities (1) September 30, 2018 1 Year or Less 1-5 Years 5-10 Years After 10 Years Total Amortized Cost: U.S. Government securities $ 28,017 $ 39,683 $ — $ — $ 67,700 Residential mortgage-backed securities — nonagency — — 282 80,437 80,719 Residential mortgage-backed securities — agency 4,168 63,372 105,393 352,758 525,691 Corporate securities 33,331 50,082 31,028 338 114,779 Total debt securities available-for-sale $ 65,516 $ 153,137 $ 136,703 $ 433,533 $ 788,889 Fair Value: U.S. Government securities $ 27,802 $ 38,896 $ — $ — $ 66,698 Residential mortgage-backed securities — nonagency — — 290 82,417 82,707 Residential mortgage-backed securities — agency 4,157 61,565 101,718 340,346 507,786 Corporate securities 33,337 49,575 31,533 733 115,178 Total debt securities available-for-sale $ 65,296 $ 150,036 $ 133,541 $ 423,496 $ 772,369 Debt Securities Held-to-Maturity Distribution of Maturities (1) September 30, 2018 1 Year or Less 1-5 Years 5-10 Years After 10 Years Total Amortized Cost: Asset-backed securities $ — $ — $ 4,000 $ 9,000 $ 13,000 Corporate securities — — — — — Total debt securities held-to-maturity $ — $ — $ 4,000 $ 9,000 $ 13,000 Fair Value: Asset-backed securities $ — $ — $ 3,998 $ 9,037 $ 13,035 Corporate securities — — — — — Total debt securities held-to-maturity $ — $ — $ 3,998 $ 9,037 $ 13,035 (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 debt securities with unrealized losses (dollars in thousands) : Less than 12 Months 12 Months or More Total Debt Securities Available-for-Sale Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses September 30, 2018 U.S. Government securities $ 9,779 $ 199 $ 56,919 $ 803 $ 66,698 $ 1,002 Residential mortgage-backed securities — nonagency 1,544 10 3,242 80 4,786 90 Residential mortgage-backed securities — agency 233,946 7,439 269,757 10,554 503,703 17,993 Corporate securities 74,801 626 6,438 82 81,239 708 Total temporarily impaired securities $ 320,070 $ 8,274 $ 336,356 $ 11,519 $ 656,426 $ 19,793 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 32,495 77 — — 32,495 77 Total temporarily impaired securities $ 393,140 $ 2,992 $ 237,567 $ 5,156 $ 630,707 $ 8,148 Less than 12 Months 12 Months or More Total Debt Securities Held-to-Maturity Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses September 30, 2018 Asset-backed securities $ 3,998 $ 2 $ — $ — $ 3,998 $ 2 Total temporarily impaired securities $ 3,998 $ 2 $ — $ — $ 3,998 $ 2
Schedule of Proceeds from Sales and Redemptions of Available for Sale Securities	Sales and calls of securities are summarized in the following table for the periods presented (dollars in thousands) : Three Months Ended Nine Months Ended September 30 September 30 Debt Securities Available-For-Sale 2018 2017 2018 2017 Proceeds from sales and calls $ 10,712 $ 6,810 $ 14,987 $ 71,588 Gross gains on sales and calls $ 188 $ 3 $ 438 $ 121 Gross losses on sales and calls (7 ) — (7 ) (93 ) Net realized gains on sales and calls $ 181 $ 3 $ 431 $ 28

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Schedule of Loans	Loans, in total, are summarized as follows (dollars in thousands) : Total Loans September 30, 2018 December 31, 2017 Construction, land & land development $ 500,095 $ 451,993 Other commercial real estate 1,186,724 1,255,002 Total commercial real estate 1,686,819 1,706,995 Residential real estate 329,470 333,086 Owner-occupied real estate 365,706 399,370 Commercial, financial & agricultural 1,159,294 973,440 Leases 30,410 52,396 Consumer 65,635 66,906 Total loans 3,637,334 3,532,193 Allowance for loan and lease losses (34,789 ) (28,750 ) Total loans, net $ 3,602,545 $ 3,503,443 Organic loans, net of related discounts, are summarized as follows (dollars in thousands) : Organic Loans September 30, 2018 December 31, 2017 Construction, land & land development $ 480,530 $ 412,540 Other commercial real estate 939,258 949,594 Total commercial real estate 1,419,788 1,362,134 Residential real estate 238,292 196,225 Owner-occupied real estate 275,095 260,273 Commercial, financial & agricultural 758,897 430,205 Leases 30,410 52,396 Consumer 64,361 64,610 Total organic loans (1) 2,786,843 2,365,843 Allowance for loan and lease losses (27,427 ) (24,039 ) Total organic loans, net $ 2,759,416 $ 2,341,804 (1) Includes net deferred loan fees that totaled approximately $10.3 million and $9.3 million at September 30, 2018 and December 31, 2017 , respectively. Purchased non-credit impaired loans ("PNCI loans"), net of related discounts, are summarized as follows (dollars in thousands) : Purchased Non-Credit Impaired Loans September 30, 2018 December 31, 2017 Construction, land & land development $ 13,284 $ 25,908 Other commercial real estate 186,556 218,660 Total commercial real estate 199,840 244,568 Residential real estate 61,141 96,529 Owner-occupied real estate 73,466 118,294 Commercial, financial & agricultural 390,097 529,184 Consumer 1,197 2,161 Total purchased non-credit impaired loans (1) 725,741 990,736 Allowance for loan and lease losses (3,389 ) (995 ) Total purchased non-credit impaired loans, net $ 722,352 $ 989,741 (1) Includes net discounts that totaled approximately $6.1 million and $12.7 million at September 30, 2018 and December 31, 2017 , respectively. Purchased credit impaired loans ("PCI loans"), net of related discounts, are summarized as follows (dollars in thousands) : Purchased Credit Impaired Loans September 30, 2018 December 31, 2017 Construction, land & land development $ 6,281 $ 13,545 Other commercial real estate 60,910 86,748 Total commercial real estate 67,191 100,293 Residential real estate 30,037 40,332 Owner-occupied real estate 17,145 20,803 Commercial, financial & agricultural 10,300 14,051 Consumer 77 135 Total purchased credit impaired loans 124,750 175,614 Allowance for loan and lease losses (3,973 ) (3,716 ) Total purchased credit impaired loans, net $ 120,777 $ 171,898
Schedule of Purchased Credit Impaired Loans Rollforward	Changes in the carrying value of purchased credit impaired loans are presented in the following table for the periods presented (dollars in thousands) : Three Months Ended Nine Months Ended September 30 September 30 Purchased Credit Impaired Loans 2018 2017 2018 2017 Balance, beginning of period $ 144,474 $ 130,837 $ 171,898 $ 155,573 Accretion of fair value discounts 8,154 6,520 20,695 23,425 Fair value of acquired loans — 77,551 — 77,551 Reductions in principal balances resulting from repayments, write-offs and foreclosures (31,866 ) (16,009 ) (71,559 ) (57,962 ) Change in the allowance for loan and lease losses on purchased credit impaired loans 15 1,528 (257 ) 1,840 Balance, end of period $ 120,777 $ 200,427 $ 120,777 $ 200,427
Schedule of Changes in Accretable Discount	Changes in the value of the accretable discount on purchased credit impaired loans are presented in the following table for the periods presented (dollars in thousands) : Three Months Ended Nine Months Ended September 30 September 30 Changes in Accretable Discount 2018 2017 2018 2017 Balance, beginning of period $ 53,538 $ 59,808 $ 57,927 $ 69,301 Additions from acquisitions — 11,664 — 11,664 Accretion (8,154 ) (6,520 ) (20,695 ) (23,425 ) Transfers to accretable discounts and exit events, net 515 2,244 8,667 9,656 Balance, end of period $ 45,899 $ 67,196 $ 45,899 $ 67,196

Allowance for Loan and Lease _2

Allowance for Loan and Lease Losses (ALLL) (Tables)	9 Months Ended
	Sep. 30, 2018
Receivables [Abstract]
Schedule of Allowance for Loan and Lease Losses	The following tables summarize the Company's allowance for loan and lease losses for the periods indicated (dollars in thousands) : Three Months Ended September 30 2018 2017 Organic Loans Purchased Non-Credit Impaired Loans Purchased Credit Impaired Loans Total Organic Loans Purchased Non-Credit Impaired Loans Purchased Credit Impaired Loans Total Balance, beginning of period $ 26,366 $ 2,981 $ 3,988 $ 33,335 $ 22,560 $ 667 $ 4,761 $ 27,988 Charge-offs (326 ) (451 ) (124 ) (901 ) (912 ) (152 ) (643 ) (1,707 ) Recoveries 87 59 — 146 106 40 — 146 Net (charge-offs) recoveries (239 ) (392 ) (124 ) (755 ) (806 ) (112 ) (643 ) (1,561 ) Provision for loan and lease losses 1,300 800 109 2,209 955 345 (885 ) 415 Balance, end of period $ 27,427 $ 3,389 $ 3,973 $ 34,789 $ 22,709 $ 900 $ 3,233 $ 26,842 Nine Months Ended September 30 2018 2017 Organic Loans Purchased Non-Credit Impaired Loans Purchased Credit Impaired Loans Total Organic Loans Purchased Non-Credit Impaired Loans Purchased Credit Impaired Loans Total Balance, beginning of period $ 24,039 $ 995 $ 3,716 $ 28,750 $ 21,086 $ 439 $ 5,073 $ 26,598 Charge-offs (1,161 ) (776 ) (247 ) (2,184 ) (1,988 ) (397 ) (971 ) (3,356 ) Recoveries 290 123 — 413 296 42 — 338 Net (charge-offs) recoveries (871 ) (653 ) (247 ) (1,771 ) (1,692 ) (355 ) (971 ) (3,018 ) Provision for loan and lease losses 4,259 3,047 504 7,810 3,315 816 (869 ) 3,262 Balance, end of period $ 27,427 $ 3,389 $ 3,973 $ 34,789 $ 22,709 $ 900 $ 3,233 $ 26,842
Schedule of Allowance for Loan and Lease Losses, Organic and Purchased Credit Impaired Loans	Activity in the allowance for loan and lease losses on organic loans is detailed as follows by portfolio segment for the periods indicated (dollars in thousands) : Organic Loans Commercial Real Estate Residential Real Estate Owner-Occupied Real Estate Commercial, Financial & Agricultural Leases Consumer Total Three Months Ended September 30, 2018 Beginning balance $ 12,154 $ 2,412 $ 2,954 $ 7,438 $ 411 $ 997 $ 26,366 Charge-offs — (28 ) — (201 ) (39 ) (58 ) (326 ) Recoveries 1 14 — 50 4 18 87 Provision (668 ) 88 496 1,664 (31 ) (249 ) 1,300 Ending balance $ 11,487 $ 2,486 $ 3,450 $ 8,951 $ 345 $ 708 $ 27,427 Nine Months Ended September 30, 2018 Beginning balance $ 13,037 $ 2,809 $ 2,075 $ 4,535 $ 629 $ 954 $ 24,039 Charge-offs (277 ) (240 ) — (360 ) (119 ) (165 ) (1,161 ) Recoveries 21 24 — 156 37 52 290 Provision (1,294 ) (107 ) 1,375 4,620 (202 ) (133 ) 4,259 Ending balance $ 11,487 $ 2,486 $ 3,450 $ 8,951 $ 345 $ 708 $ 27,427 Three Months Ended September 30, 2017 Beginning balance $ 13,337 $ 1,841 $ 2,036 $ 3,663 $ 825 $ 858 $ 22,560 Charge-offs (746 ) — — (98 ) (2 ) (66 ) (912 ) Recoveries — 3 — 20 67 16 106 Provision 469 132 374 97 (194 ) 77 955 Ending balance $ 13,060 $ 1,976 $ 2,410 $ 3,682 $ 696 $ 885 $ 22,709 Nine Months Ended September 30, 2017 Beginning balance $ 11,767 $ 1,786 $ 2,239 $ 4,093 $ 655 $ 546 $ 21,086 Charge-offs (933 ) (48 ) — (240 ) (501 ) (266 ) (1,988 ) Recoveries — 9 — 71 176 40 296 Provision 2,226 229 171 (242 ) 366 565 3,315 Ending balance $ 13,060 $ 1,976 $ 2,410 $ 3,682 $ 696 $ 885 $ 22,709 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 September 30, 2018 Commercial real estate $ — $ 11,487 $ 11,487 $ 2,799 $ 1,416,989 $ 1,419,788 Residential real estate — 2,486 2,486 1,333 236,959 238,292 Owner-occupied real estate 25 3,425 3,450 3,456 271,639 275,095 Commercial, financial & agricultural 108 8,843 8,951 5,917 752,980 758,897 Leases — 345 345 — 30,410 30,410 Consumer — 708 708 — 64,361 64,361 Total organic loans $ 133 $ 27,294 $ 27,427 $ 13,505 $ 2,773,338 $ 2,786,843 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 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 indicated (dollars in thousands) : Purchased Non-Credit Impaired Loans Commercial Real Estate Residential Real Estate Owner-Occupied Real Estate Commercial, Financial & Agricultural Consumer Total Three Months Ended September 30, 2018 Beginning balance $ 292 $ 334 $ 441 $ 1,910 $ 4 $ 2,981 Charge-offs (406 ) (44 ) — — (1 ) (451 ) Recoveries 23 8 9 18 1 59 Provision 439 (42 ) 30 375 (2 ) 800 Ending balance $ 348 $ 256 $ 480 $ 2,303 $ 2 $ 3,389 Nine Months Ended September 30, 2018 Beginning balance $ 230 $ 664 $ 88 $ 8 $ 5 $ 995 Charge-offs (406 ) (80 ) (249 ) (37 ) (4 ) (776 ) Recoveries 30 18 30 42 3 123 Provision 494 (346 ) 611 2,290 (2 ) 3,047 Ending balance $ 348 $ 256 $ 480 $ 2,303 $ 2 $ 3,389 Three Months Ended September 30, 2017 Beginning balance $ 145 $ 342 $ 152 $ 26 $ 2 $ 667 Charge-offs (50 ) (7 ) — (91 ) (4 ) (152 ) Recoveries 1 5 — 32 2 40 Provision 93 120 68 61 3 345 Ending balance $ 189 $ 460 $ 220 $ 28 $ 3 $ 900 Nine Months Ended September 30, 2017 Beginning balance $ 88 $ 72 $ 44 $ 235 $ — $ 439 Charge-offs (50 ) (7 ) (80 ) (251 ) (9 ) (397 ) Recoveries 1 5 — 32 4 42 Provision 150 390 256 12 8 816 Ending balance $ 189 $ 460 $ 220 $ 28 $ 3 $ 900 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 dates 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 September 30, 2018 Commercial real estate $ — $ 348 $ 348 $ — $ 199,840 $ 199,840 Residential real estate — 256 256 181 60,960 61,141 Owner-occupied real estate 24 456 480 823 72,643 73,466 Commercial, financial & agricultural 629 1,674 2,303 55,668 334,429 390,097 Consumer — 2 2 — 1,197 1,197 Total purchased non-credit impaired loans $ 653 $ 2,736 $ 3,389 $ 56,672 $ 669,069 $ 725,741 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 Activity in the allowance for loan and lease losses on purchased credit impaired loans is detailed as follows by portfolio segment for the periods indicated (dollars in thousands) : Purchased Credit Impaired Loans Commercial Real Estate Residential Real Estate Owner-Occupied Real Estate Commercial, Financial & Agricultural Consumer Total Three Months Ended September 30, 2018 Beginning balance $ 2,172 $ 786 $ 816 $ 214 $ — $ 3,988 Charge-offs — (1 ) (123 ) — — (124 ) Recoveries — — — — — — Provision (379 ) 380 112 (4 ) — 109 Ending balance $ 1,793 $ 1,165 $ 805 $ 210 $ — $ 3,973 Nine Months Ended September 30, 2018 Beginning balance $ 1,706 $ 1,242 $ 718 $ 42 $ 8 $ 3,716 Charge-offs (34 ) (74 ) (133 ) — (6 ) (247 ) Recoveries — — — — — — Provision 121 (3 ) 220 168 (2 ) 504 Ending balance $ 1,793 $ 1,165 $ 805 $ 210 $ — $ 3,973 Three Months Ended September 30, 2017 Beginning balance $ 2,131 $ 968 $ 1,611 $ 37 $ 14 $ 4,761 Charge-offs (168 ) (50 ) (416 ) (6 ) (3 ) (643 ) Recoveries — — — — — — Provision (506 ) 310 (697 ) 5 3 (885 ) Ending balance $ 1,457 $ 1,228 $ 498 $ 36 $ 14 $ 3,233 Nine Months Ended September 30, 2017 Beginning balance $ 2,183 $ 1,196 $ 1,655 $ 38 $ 1 $ 5,073 Charge-offs (401 ) (92 ) (452 ) (22 ) (4 ) (971 ) Recoveries — — — — — — Provision (325 ) 124 (705 ) 20 17 (869 ) Ending balance $ 1,457 $ 1,228 $ 498 $ 36 $ 14 $ 3,233 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 September 30, 2018 Commercial real estate $ 996 $ 797 $ 1,793 $ 55,816 $ 11,375 $ 67,191 Residential real estate 68 1,097 1,165 2,257 27,780 30,037 Owner-occupied real estate 695 110 805 7,539 9,606 17,145 Commercial, financial & agricultural 5 205 210 52 10,248 10,300 Consumer — — — — 77 77 Total purchased credit impaired loans $ 1,764 $ 2,209 $ 3,973 $ 65,664 $ 59,086 $ 124,750 December 31, 2017 Commercial real estate $ 1,052 $ 654 $ 1,706 $ 79,085 $ 21,208 $ 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 $ 93,915 $ 81,699 $ 175,614
Impaired Loans, Organic and Purchased Non-Credit Impaired	Impaired loans, segregated by class of loans, are presented in the following table (dollars in thousands) : September 30, 2018 December 31, 2017 Unpaid Principal Balance Recorded Investment Related Allowance Unpaid Principal Balance Recorded Investment Related Allowance Impaired Loans (1) With no related allowance recorded: Construction, land & land development $ 26 $ 23 $ — $ 82 $ 79 $ — Other commercial real estate 2,801 2,799 — 4,617 3,822 — Total commercial real estate 2,827 2,822 — 4,699 3,901 — Residential real estate 2,579 2,345 — 453 456 — Owner-occupied real estate 1,620 1,554 — 4,172 4,015 — Commercial, financial & agricultural 44,851 42,844 — 2,739 1,882 — Consumer 30 22 — 51 40 — Subtotal 51,907 49,587 — 12,114 10,294 — With related allowance recorded: Construction, land & land development 178 177 88 113 112 56 Other commercial real estate — — — — — — Total commercial real estate 178 177 88 113 112 56 Residential real estate 694 619 310 1,452 1,399 699 Owner-occupied real estate 3,544 3,411 331 350 335 125 Commercial, financial & agricultural 20,376 20,160 1,303 872 821 318 Consumer 261 73 36 83 81 40 Subtotal 25,053 24,440 2,068 2,870 2,748 1,238 Total impaired loans $ 76,960 $ 74,027 $ 2,068 $ 14,984 $ 13,042 $ 1,238 (1) Includes loans with SBA guaranteed balances of $5.0 million and $5.7 million at September 30, 2018 and December 31, 2017 , 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) : September 30, 2018 September 30, 2017 Impaired Loans Average Recorded Investment (1) Interest Income Recognized (2) Average Recorded Investment (1) Interest Income Recognized (2) Three Months Ended Construction, land & land development $ 202 $ — $ 146 $ — Other commercial real estate 2,800 — 4,347 — Total commercial real estate 3,002 — 4,493 — Residential real estate 3,274 — 1,120 — Owner-occupied real estate 5,021 — 3,446 — Commercial, financial & agricultural 62,768 548 2,653 — Consumer 100 — 87 — Total impaired loans $ 74,165 $ 548 $ 11,799 $ — Nine Months Ended Construction, land & land development $ 156 $ — $ 2,862 $ — Other commercial real estate 3,172 16 4,558 — Total commercial real estate 3,328 16 7,420 — Residential real estate 3,824 — 1,154 — Owner-occupied real estate 4,406 — 3,500 — Commercial, financial & agricultural 48,672 1,575 2,761 1 Consumer 121 — 94 — Total impaired loans $ 60,351 $ 1,591 $ 14,929 $ 1 (1) The average recorded investment for troubled debt restructurings was $6.4 million and $6.8 million for the three and nine months ended September 30, 2018 , respectively, and was $0 and $2.7 million for the three and nine months ended September 30, 2017 , respectively. (2) The interest income recognized on troubled debt restructurings was $60,000 and $191,000 for the three and nine months ended September 30, 2018 , respectively, and was $0 for both the three and nine months ended September 30, 2017 .
Nonaccrual Loans, Organic and Purchased Non-Credit Impaired	The following table presents the recorded investment in nonaccrual loans by loan class at the dates indicated (dollars in thousands) : Nonaccrual Loans September 30, 2018 December 31, 2017 Construction, land & land development $ 200 $ 191 Other commercial real estate 2,799 3,257 Total commercial real estate 2,999 3,448 Residential real estate 2,964 1,855 Owner-occupied real estate 4,965 4,350 Commercial, financial & agricultural 21,832 2,703 Consumer 95 121 Total nonaccrual loans $ 32,855 $ 12,477
Past Due Loans	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 September 30, 2018 Construction, land & land development $ 186 $ 130 $ 316 $ 480,214 $ 480,530 $ — Other commercial real estate — — — 939,258 939,258 — Total commercial real estate 186 130 316 1,419,472 1,419,788 — Residential real estate 960 50 1,010 237,282 238,292 — Owner-occupied real estate 4,761 967 5,728 269,367 275,095 — Commercial, financial & agricultural 1,749 535 2,284 756,613 758,897 — Leases — — — 30,410 30,410 — Consumer 58 22 80 64,281 64,361 — Total organic loans $ 7,714 $ 1,704 $ 9,418 $ 2,777,425 $ 2,786,843 $ — 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 $ — 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 September 30, 2018 Construction, land & land development $ — $ — $ — $ 13,284 $ 13,284 $ — Other commercial real estate — — — 186,556 186,556 — Total commercial real estate — — — 199,840 199,840 — Residential real estate 326 45 371 60,770 61,141 — Owner-occupied real estate 156 — 156 73,310 73,466 — Commercial, financial & agricultural 18,848 391 19,239 370,858 390,097 — Consumer — 18 18 1,179 1,197 — Total purchased non-credit impaired loans $ 19,330 $ 454 $ 19,784 $ 705,957 $ 725,741 $ — 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 $ — 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 September 30, 2018 Construction, land & land development $ 11 $ 1,765 $ 1,776 $ 4,505 $ 6,281 Other commercial real estate 36 2,377 2,413 58,497 60,910 Total commercial real estate 47 4,142 4,189 63,002 67,191 Residential real estate 975 1,186 2,161 27,876 30,037 Owner-occupied real estate 416 140 556 16,589 17,145 Commercial, financial & agricultural — 1,427 1,427 8,873 10,300 Consumer — — — 77 77 Total purchased credit impaired loans $ 1,438 $ 6,895 $ 8,333 $ 116,417 $ 124,750 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
Risk Grades of Loan Portfolio	The following table presents the risk grades of the purchased credit impaired loan portfolio, by class of loans (dollars in thousands) : Purchased Credit Impaired Loans Pass Watch OAEM Substandard Doubtful Total September 30, 2018 Construction, land & land development $ 869 $ 581 $ 908 $ 3,923 $ — $ 6,281 Other commercial real estate 33,835 15,631 1,261 10,183 — 60,910 Total commercial real estate 34,704 16,212 2,169 14,106 — 67,191 Residential real estate 15,133 5,747 553 8,538 66 30,037 Owner-occupied real estate 7,045 2,897 1,716 5,487 — 17,145 Commercial, financial & agricultural 6 110 5,030 5,154 — 10,300 Consumer 29 24 18 6 — 77 Total purchased credit impaired loans $ 56,917 $ 24,990 $ 9,486 $ 33,291 $ 66 $ 124,750 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 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 September 30, 2018 Construction, land & land development $ 453,014 $ 20,906 $ 6,350 $ 130 $ 130 $ 480,530 Other commercial real estate 902,471 33,420 556 2,811 — 939,258 Total commercial real estate 1,355,485 54,326 6,906 2,941 130 1,419,788 Residential real estate 230,722 4,254 401 2,915 — 238,292 Owner-occupied real estate 236,779 30,673 667 6,976 — 275,095 Commercial, financial & agricultural 673,850 76,901 1,096 7,050 — 758,897 Leases 28,749 1,661 — — — 30,410 Consumer 64,163 125 — 73 — 64,361 Total organic loans $ 2,589,748 $ 167,940 $ 9,070 $ 19,955 $ 130 $ 2,786,843 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 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 September 30, 2018 Construction, land & land development $ 13,217 $ 43 $ — $ 24 $ — $ 13,284 Other commercial real estate 145,202 39,078 1,752 524 — 186,556 Total commercial real estate 158,419 39,121 1,752 548 — 199,840 Residential real estate 58,406 1,297 153 1,212 73 61,141 Owner-occupied real estate 65,546 4,627 — 3,293 — 73,466 Commercial, financial & agricultural 258,546 63,524 29,475 38,552 — 390,097 Consumer 1,144 6 — 29 18 1,197 Total purchased non-credit impaired loans $ 542,061 $ 108,575 $ 31,380 $ 43,634 $ 91 $ 725,741 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
Troubled Debt Restructurings on Financing Receivables	The following table provides information on loans that were modified as TDRs during the periods presented (dollars in thousands) : September 30, 2018 September 30, 2017 TDR Additions (1) Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Nine Months Ended Construction, land & land development — $ — $ — — $ — $ — Other commercial real estate 2 2,801 2,801 — — — Total commercial real estate 2 2,801 2,801 — — — Commercial & industrial — — — — — — Owner-occupied real estate — — — — — — Residential real estate 1 2,769 2,769 — — — Consumer & Other — — — — — — Total modifications 3 $ 5,570 $ 5,570 — $ — $ — (1) The pre-modification and post-modification recorded investment amount represents the recorded investment on the date of the loan modification. Since the modifications on these loans were either an interest rate concession or payment term extension, not principal reductions, the pre-modification and post-modification recorded investment amount is the same.

SBA Servicing Rights (Tables)

SBA Servicing Rights (Tables)	9 Months Ended
	Sep. 30, 2018
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 periods presented (dollars in thousands) : Three Months Ended Nine Months Ended September 30 September 30 SBA Servicing Rights 2018 2017 2018 2017 Balance, beginning of period $ 3,989 $ 3,828 $ 4,069 $ 3,477 Additions 325 253 738 850 Fair value adjustments (472 ) (131 ) (965 ) (377 ) Balance, end of period $ 3,842 $ 3,950 $ 3,842 $ 3,950
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value	The fair value of the SBA servicing rights asset, key metrics, and the sensitivity of the fair value due to adverse changes in key economic assumptions at the periods presented are as follows (dollars in thousands) : SBA Servicing Rights September 30, 2018 December 31, 2017 Fair value $ 3,842 $ 4,069 Weighted average discount rate 13.4 % 12.9 % Decline in fair value due to a 100 basis point adverse change $ (119 ) $ (140 ) Decline in fair value due to a 200 basis point adverse change (232 ) (272 ) Prepayment speed 11.9 % 9.1 % Decline in fair value due to a 10% adverse change $ (162 ) $ (141 ) Decline in fair value due to a 20% adverse change (313 ) (275 ) Weighted average remaining life (years) 5.5 6.7
Schedule of Servicing Assets Past Due	Information about the SBA loans serviced by the Company at and for the periods presented are as follows (dollars in thousands) : September 30, 2018 SBA Loans Serviced Unpaid Principal Balance 30 - 89 Days Past Due 90 Days or Greater Past Due Net Charge-offs for the Nine Months Ended September 30, 2018 Serviced for others $ 195,926 $ 72 $ — $ — Held-for-sale 17,382 — — — Held-for-investment 159,964 4,137 4,968 104 Total SBA loans serviced $ 373,272 $ 4,209 $ 4,968 $ 104 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 Nine Months Ended September 30, 2017 Serviced for others $ 185,557 $ 1,555 $ — $ — Held-for-sale 10,420 — — — Held-for-investment 153,810 2,508 6,627 454 Total SBA loans serviced $ 349,787 $ 4,063 $ 6,627 $ 454

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2018
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 presented (dollars in thousands) : Derivative Assets (1) Derivative Liabilities (1) September 30, 2018 December 31, 2017 September 30, 2018 December 31, 2017 Derivatives Designated as Hedging Instruments Interest rate swaps and caps $ 4,656 $ 2,011 $ — $ 116 Total $ 4,656 $ 2,011 $ — $ 116 Derivatives Not Designated as Hedging Instruments Mortgage derivatives $ — $ 616 $ — $ 238 Total $ — $ 616 $ — $ 238 (1) All derivative assets are located in "Other Assets" on the consolidated statements of financial condition and all derivative liabilities are located in "Other Liabilities" on the consolidated statements of financial condition.
Schedule of effect of fair value and cash flow hedge accounting on the Statements of Income	The tables below presents the effect of fair value and cash flow hedge accounting on the consolidated statements of income for the periods presented (dollars in thousands) : Three Months Ended September 30 2018 2017 Interest Income Interest Expense Noninterest Income Interest Income Interest Expense Noninterest Income Total amounts of income and expense line items presented in the consolidated statements of income $ 66,624 $ 8,039 $ 9,738 $ 47,702 $ 3,370 $ 9,682 Gain (loss) on fair value hedging relationships in Subtopic 815-20 Interest rate swaps: Hedged items (457 ) — — — — (55 ) Derivatives designated as hedging instruments 434 — — — — 3 Gain (loss) on cash flow hedging relationships in Subtopic 815-20 Interest rate caps: Amount of loss reclassified from accumulated other comprehensive loss into income — — — — 379 — Nine Months Ended September 30 2018 2017 Interest Income Interest Expense Noninterest Income Interest Income Interest Expense Noninterest Income Total amounts of income and expense line items presented in the consolidated statements of income $ 190,873 $ 21,302 $ 31,116 $ 144,746 $ 9,978 $ 29,617 Gain (loss) on fair value hedging relationships in Subtopic 815-20 Interest rate swaps: Hedged items (2,773 ) — — — — (138 ) Derivatives designated as hedging instruments 2,961 — — — — 35 Gain (loss) on cash flow hedging relationships in Subtopic 815-20 Interest rate caps: Amount of loss reclassified from accumulated other comprehensive loss into income — 91 — — 1,213 —
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location	The tables below presents the effect of fair value hedges on the consolidated statements of financial condition for the periods presented (dollars in thousands) : Line Item in the Statement of Financial Condition in Which the Hedged Item Is Included Carrying Amount of the Hedged Asset Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Asset September 30, 2018 December 31, 2017 September 30, 2018 December 31, 2017 Loans $ 108,206 $ 139,391 $ (4,528 ) $ (1,892 ) Total $ 108,206 $ 139,391 $ (4,528 ) $ (1,892 )
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) : Three Months Ended Nine Months Ended September 30 September 30 Interest Rate Products Location 2018 2017 2018 2017 Amount of (loss) gain recognized in AOCI on derivatives OCI $ — $ (30 ) $ (4 ) $ 50 Amount of loss reclassified from AOCI into income Interest expense — 379 91 1,213 Amount of loss recognized in consolidated statements of comprehensive income $ — $ (409 ) $ (95 ) $ (1,163 )
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) : Three Months Ended Nine Months Ended September 30 September 30 Interest Rate Products Location 2018 2017 2018 2017 Amount of loss recognized in income on interest rate swaps Noninterest income $ — $ (68 ) $ — $ (124 ) Amount of (loss) gain recognized in income on interest rate lock commitments Noninterest income (849 ) (79 ) (307 ) 250 Amount of gain (loss) gain recognized in income on forward commitments Noninterest income 535 (66 ) (71 ) (748 ) Total loss recognized in income on derivatives not designated as hedging instruments $ (314 ) $ (213 ) $ (378 ) $ (622 )

Balance Sheet Offsetting and _2

Balance Sheet Offsetting and Repurchase Agreements (Tables)	9 Months Ended
	Sep. 30, 2018
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) September 30, 2018 Offsetting Assets Interest rate swaps and caps $ 4,656 $ — $ 4,656 $ — $ (4,502 ) $ 154 Offsetting Liabilities Interest rate swaps and caps $ — $ — $ — $ — $ — $ — Repurchase agreements 33,621 — 33,621 — (33,621 ) — Total liabilities $ 33,621 $ — $ 33,621 $ — $ (33,621 ) $ — December 31, 2017 Offsetting Assets Interest rate swaps and caps $ 2,011 $ — $ 2,011 $ (116 ) $ (1,895 ) $ — Offsetting 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 ) $ — (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) September 30, 2018 Offsetting Assets Interest rate swaps and caps $ 4,656 $ — $ 4,656 $ — $ (4,502 ) $ 154 Offsetting Liabilities Interest rate swaps and caps $ — $ — $ — $ — $ — $ — Repurchase agreements 33,621 — 33,621 — (33,621 ) — Total liabilities $ 33,621 $ — $ 33,621 $ — $ (33,621 ) $ — December 31, 2017 Offsetting Assets Interest rate swaps and caps $ 2,011 $ — $ 2,011 $ (116 ) $ (1,895 ) $ — Offsetting 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 ) $ — (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.

Regulatory Matters (Tables)

Regulatory Matters (Tables)	9 Months Ended
	Sep. 30, 2018
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 both September 30, 2018 and December 31, 2017 are presented in the table below: Capital Ratio Requirements Minimum Requirement Well-capitalized (1) Common Equity Tier 1 (CET1) capital ratio 4.50% 6.50% Tier 1 risk-based capital ratio 6.00% 8.00% Total risk-based capital ratio 8.00% 10.00% Tier 1 leverage ratio 4.00% 5.00% (1) The prompt corrective action provisions are only applicable at the bank level. At September 30, 2018 and December 31, 2017 , 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) : September 30, 2018 December 31, 2017 Actual Required Actual Required Amount Ratio Minimum Amount Amount Ratio Minimum Amount Company Common Equity Tier 1 (CET1) capital ratio $ 579,770 12.89 % $ 202,409 $ 547,822 12.61 % $ 195,433 Tier 1 risk-based capital ratio 579,770 12.89 % 269,878 547,822 12.61 % 260,578 Total risk-based capital ratio 614,559 13.66 % 359,838 576,572 13.28 % 347,437 Tier 1 leverage ratio 579,770 11.85 % 195,697 547,822 11.24 % 194,924 State Bank's regulatory ratios at the dates indicated are presented in the table below (dollars in thousands) : September 30, 2018 December 31, 2017 Actual Required Actual Required Amount Ratio Minimum Amount Well Capitalized Amount Amount Ratio Minimum Amount Well Capitalized Amount State Bank Common Equity Tier 1 (CET1) capital ratio $ 515,147 11.45 % $ 202,547 $ 292,567 $ 481,135 11.10 % $ 194,972 $ 281,626 Tier 1 risk-based capital ratio 515,147 11.45 % 270,062 360,083 481,135 11.10 % 259,962 346,617 Total risk-based capital ratio 549,936 12.22 % 360,083 450,104 509,885 11.77 % 346,617 433,271 Tier 1 leverage ratio 515,147 10.54 % 195,430 244,288 481,135 9.90 % 194,429 243,037

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Tables)	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Summary of Commitments	A summary of the Company's commitments is as follows (dollars in thousands) : September 30, 2018 December 31, 2017 Commitments to extend credit: Fixed $ 99,290 $ 65,117 Variable 966,924 914,524 Letters of credit: Fixed 5,628 5,978 Variable 6,998 11,428 Total commitments $ 1,078,840 $ 997,047

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables present 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) : September 30, 2018 Quoted Market Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: Equity securities - financial services industry $ — $ 1,515 $ — $ 1,515 U.S. Government securities — 66,698 — 66,698 Residential mortgage-backed securities — nonagency — 82,707 — 82,707 Residential mortgage-backed securities — agency — 507,786 — 507,786 Corporate securities — 115,178 — 115,178 Hedged loans — 108,206 — 108,206 Mortgage loans held-for-sale — 13,294 — 13,294 Interest rate swaps and caps — 4,656 — 4,656 SBA servicing rights — — 3,842 3,842 Total recurring assets at fair value $ — $ 900,040 $ 3,842 $ 903,882 December 31, 2017 Quoted Market Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: Equity securities - financial services industry $ — $ 1,515 $ — $ 1,515 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 — 108,337 — 108,337 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
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation	Changes in the carrying value of mortgage derivatives utilizing Level 3 inputs are presented in the following tables for the periods presented (dollars in thousands) : Three Months Ended September 30 Nine Months Ended September 30 2018 2018 Mortgage Derivatives Other Assets Other Liabilities Other Assets Other Liabilities Balance, beginning of period $ 961 $ 435 $ 515 $ 200 Issuances (1) — — 1,031 740 Settlements and closed loans (1) (961 ) (435 ) (1,546 ) (940 ) Balance, end of period $ — $ — $ — $ — Three Months Ended September 30 Nine Months Ended September 30 2017 2017 Mortgage Derivatives Other Assets Other Liabilities Other Assets Other Liabilities Balance, beginning of period $ 890 $ 385 $ 699 $ 445 Issuances (1) 339 339 1,543 1,167 Settlements and closed loans (1) (492 ) (385 ) (1,505 ) (1,273 ) Balance, end of period $ 737 $ 339 $ 737 $ 339 (1) The change in fair value, recorded as a component of "mortgage banking income" on the consolidated statements of income, was a loss of $526,000 and a loss of $315,000 for the three and nine months ended September 30, 2018 , respectively. The change in fair value resulted in a loss of $107,000 and a gain of $144,000 for the three and nine months ended September 30, 2017 , respectively.
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 September 30, 2018 Impaired loans $ — $ — $ 71,959 $ 71,959 Total nonrecurring assets at fair value $ — $ — $ 71,959 $ 71,959 December 31, 2017 Impaired loans $ — $ — $ 11,804 $ 11,804 Total nonrecurring assets at fair value $ — $ — $ 11,804 $ 11,804
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 September 30, 2018 Other real estate owned $ — $ — $ 5,949 $ 5,949 December 31, 2017 Other real estate owned $ — $ — $ 1,204 $ 1,204
Fair Value, Assets Measured on Recurring 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 820 to the amount recorded on the consolidated statement of financial condition at the dates indicated (dollars in thousands) : September 30, 2018 December 31, 2017 Other real estate owned: Other real estate owned at fair value $ 5,949 $ 1,204 Estimated selling costs and other adjustments (507 ) (309 ) Other real estate owned $ 5,442 $ 895
Fair Value Measurements Unobservable Inputs	The following tables provide information describing the unobservable inputs used in Level 3 fair value measurements at the dates indicated (dollars in thousands) : September 30, 2018 Fair Value Valuation Technique Unobservable Inputs Range (Weighted Average) SBA servicing rights $ 3,842 Discounted cash flows Discount rate 9% - 27% (13%) Prepayment speed 6% - 15% (12%) Impaired loans - collateral dependent $ 71,959 Third party appraisal Management discount for property type and recent market volatility 0% - 100% (3%) Other real estate owned $ 5,949 Third party appraisal Management discount for property type and recent market volatility 0% - 50% (3%) 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%)
Fair Value Measurements, Recurring and Nonrecurring	The following table includes the estimated fair value of the Company's financial assets and financial liabilities at the dates indicated (dollars in thousands) . September 30, 2018 December 31, 2017 Fair Value Hierarchy Level Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Assets: Cash and cash equivalents Level 1 $ 207,927 $ 207,927 $ 230,877 $ 230,877 Equity securities Level 2 1,515 1,515 1,515 1,515 Investment securities available-for-sale Level 2 772,369 772,369 872,455 872,455 Investment securities held-to-maturity Level 2 & 3 13,000 13,035 32,852 33,351 Loans held-for-sale Level 2 30,676 32,160 36,211 37,580 Loans, net Level 2 & 3 3,602,545 3,624,999 3,503,443 3,513,057 Other real estate owned Level 3 5,442 5,949 895 1,204 Interest rate swaps and caps Level 2 4,656 4,656 2,011 2,011 Mortgage derivatives Levels 2 & 3 — — 616 616 SBA servicing rights Level 3 3,842 3,842 4,069 4,069 Accrued interest receivable Level 2 16,790 16,790 14,906 14,906 Federal Home Loan Bank stock Level 3 4,452 4,452 4,651 4,651 Liabilities: Deposits Level 2 $ 4,186,914 $ 4,185,897 $ 4,243,135 $ 4,237,883 Federal funds purchased and securities sold under agreements to repurchase Level 2 33,621 33,621 25,209 25,209 Notes payable Level 2 — — 398 398 Interest rate swaps and caps Level 2 — — 116 116 Mortgage derivatives Levels 2 & 3 — — 238 238 Accrued interest payable Level 2 4,856 4,856 3,750 3,750

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2018
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) : Three Months Ended Nine Months Ended September 30 September 30 2018 2017 2018 2017 Numerator: Net income per consolidated statements of income $ 17,955 $ 14,436 $ 54,087 $ 41,197 Net income allocated to participating securities (400 ) (389 ) (1,342 ) (1,095 ) Net income allocated to common stock $ 17,555 $ 14,047 $ 52,745 $ 40,102 Basic earnings per share computation: Net income allocated to common stock $ 17,555 $ 14,047 $ 52,745 $ 40,102 Weighted average common shares outstanding, including shares considered participating securities 39,064,072 38,969,619 39,057,314 38,928,833 Less: Average participating securities (870,973 ) (1,050,866 ) (968,936 ) (1,034,448 ) Weighted average shares 38,193,099 37,918,753 38,088,378 37,894,385 Basic earnings per share $ .46 $ .37 $ 1.38 $ 1.06 Diluted earnings per share computation: Net income allocated to common stock $ 17,555 $ 14,047 $ 52,745 $ 40,102 Weighted average common shares outstanding for basic earnings per share 38,193,099 37,918,753 38,088,378 37,894,385 Weighted average dilutive grants 18,377 44,388 22,560 49,586 Weighted average shares and dilutive potential common shares 38,211,476 37,963,141 38,110,938 37,943,971 Diluted earnings per share $ .46 $ .37 $ 1.38 $ 1.06

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income	The components of AOCI and changes in those components for the periods presented are as follows (dollars in thousands) : Debt Securities Available-for-Sale Held-to-Maturity Securities Transferred from Available-For-Sale Cash Flow Hedges (Effective Portion) Total Three Months Ended September 30, 2018 Balance, beginning of period $ (9,791 ) $ (7 ) $ — $ (9,798 ) Other comprehensive loss before income taxes: Net change in unrealized losses (3,232 ) — — (3,232 ) Amounts reclassified for net gains realized and included in earnings (181 ) — — (181 ) Transfer of unrealized gain from held-to-maturity to available-for-sale — — — — Amortization of net unrealized losses on securities transferred to held-to-maturity — 7 — 7 Income tax benefit (863 ) — — (863 ) Balance, end of period $ (12,341 ) $ — $ — $ (12,341 ) September 30, 2017 Balance, beginning of period $ (905 ) $ (131 ) $ (523 ) $ (1,559 ) Other comprehensive income before income taxes: Net change in unrealized gains (losses) 1,634 — (30 ) 1,604 Amounts reclassified for net (gains) losses realized and included in earnings (3 ) — 379 376 Amortization of net unrealized losses on securities transferred to-held-to-maturity — (4 ) — (4 ) Income tax expense 625 — 135 760 Balance, end of period $ 101 $ (135 ) $ (309 ) $ (343 ) Nine Months Ended September 30, 2018 Balance, beginning of period $ (2,523 ) $ 21 $ (65 ) $ (2,567 ) Other comprehensive loss before income taxes: Net change in unrealized losses (12,292 ) — (4 ) (12,296 ) Amounts reclassified for net (gains) losses realized and included in earnings (431 ) — 91 (340 ) Transfer of unrealized gain from held-to-maturity to available-for-sale — (51 ) — (51 ) Amortization of net unrealized losses on securities transferred to-held-to-maturity — 30 — 30 Adoption of ASU 2016-01 23 — — 23 Income tax (benefit) expense (2,882 ) — 22 (2,860 ) Balance, end of period $ (12,341 ) $ — $ — $ (12,341 ) Debt Securities Available-for-Sale Held-to-Maturity Securities Transferred from Available-For-Sale Cash Flow Hedges (Effective Portion) Total September 30, 2017 Balance, beginning of period $ (1,200 ) $ (175 ) $ (1,082 ) $ (2,457 ) Other comprehensive income before income taxes: Net change in unrealized gains 2,148 — 50 2,198 Amounts reclassified for net (gains) losses realized and included in earnings (28 ) — 1,213 1,185 Amortization of net unrealized losses on securities transferred to-held-to-maturity — 40 — 40 Income tax expense 819 — 490 1,309 Balance, end of period $ 101 $ (135 ) $ (309 ) $ (343 )
Reclassification out of Accumulated Other Comprehensive Income	Reclassifications from AOCI into income for the periods presented are as follows (dollars in thousands) : Three Months Ended Nine Months Ended September 30 September 30 Reclassifications from AOCI into income and affected line items on Consolidated Statements of Income 2018 2017 2018 2017 Debt securities available-for-sale Gain on sale of investment securities $ 181 $ 3 $ 431 $ 28 Income tax expense (46 ) (1 ) (109 ) (11 ) Net income $ 135 $ 2 $ 322 $ 17 Cash flow hedges (effective portion) Interest expense on deposits $ — $ (379 ) $ (91 ) $ (1,213 ) Income tax benefit — 145 23 466 Net income $ — $ (234 ) $ (68 ) $ (747 )

Basis of Presentation (Details)

Basis of Presentation (Details) - $ / shares	Sep. 30, 2018	May 11, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01
State Bank Financial Corporation | Cadence
Business Acquisition [Line Items]
Number of shares received by acquiree in business acquisition		1.160
Common stock, par value (in dollars per share)		$ 0.01

Adoption of New Accounting St_2

Adoption of New Accounting Standards and Recent Accounting Pronouncements (Details) $ in Thousands	Dec. 31, 2017USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of ASU 2016-01	$ 23
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of ASU 2016-01	(23)
Accumulated Other Comprehensive Income (Loss)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of ASU 2016-01	$ 23

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 30, 2017	Oct. 31, 2017	Sep. 30, 2018	Dec. 31, 2017	[1]	Sep. 29, 2017
Business Acquisition [Line Items]
Goodwill			$ 84,564	$ 84,564
AloStar Bank of Commerce
Business Acquisition [Line Items]
Conversion price per share (in dollars per share)	$ 24.26
Total consideration paid	$ 194,969	$ 195,000
Goodwill	7,088					$ 0
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
[1]	Derived from audited financial statements

Acquisitions - Assets Acquired

Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Oct. 31, 2017	Sep. 30, 2018	Dec. 31, 2017	[1]	Sep. 29, 2017
Liabilities
Goodwill			$ 84,564	$ 84,564
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 consideration payable	194,969
Fair value of total consideration transferred	$ 194,969	$ 195,000
[1]	Derived from audited financial statements

Acquisitions - Pro Forma Inform

Acquisitions - Pro Forma Information (Details) - AloStar Bank of Commerce - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Pro Forma
Net interest income, Pro Forma	$ 169,571	$ 166,354
Net income, Pro Forma	$ 55,865	$ 48,387
Earnings per share:
Basic (in dollars per share)	$ 1.43	$ 1.24
Diluted (in dollars per share)	$ 1.43	$ 1.24

Acquisitions - Purchased Credit

Acquisitions - Purchased Credit Impaired Loans Acquired (Details) - AloStar Bank of Commerce $ in Thousands	Sep. 30, 2017USD ($)
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

Investment Securities - Availa

Investment Securities - Available-for-Sale Reconciliation (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 788,889	$ 875,802
Unrealized Gains	3,273	4,801
Unrealized Losses	19,793	8,148
Fair Value	772,369	872,455	[1]
U.S. Government securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	67,700	70,203
Unrealized Gains	0	0
Unrealized Losses	1,002	644
Fair Value	66,698	69,559
Residential mortgage-backed securities — nonagency
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	80,719	115,639
Unrealized Gains	2,078	3,183
Unrealized Losses	90	112
Fair Value	82,707	118,710
Residential mortgage-backed securities — agency
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	525,691	582,845
Unrealized Gains	88	319
Unrealized Losses	17,993	7,315
Fair Value	507,786	575,849
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	114,779	107,115
Unrealized Gains	1,107	1,299
Unrealized Losses	708	77
Fair Value	$ 115,178	$ 108,337
[1]	Derived from audited financial statements

Investment Securities - Held-t

Investment Securities - Held-to-maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 13,000	$ 32,852	[1]
Unrealized Gains	37	499
Unrealized Losses	2	0
Debt securities held-to-maturity - fair value	13,035	33,351
Asset-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	13,000	22,692
Unrealized Gains	37	259
Unrealized Losses	2	0
Debt securities held-to-maturity - fair value	13,035	22,951
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	0	10,160
Unrealized Gains	0	240
Unrealized Losses	0	0
Debt securities held-to-maturity - fair value	$ 0	$ 10,400
[1]	Derived from audited financial statements

Investment Securities - Schedu

Investment Securities - Schedule of Contractual Maturities of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due 1 Year or Less, Amortized Cost	$ 65,516
Due 1-5 Years, Amortized Cost	153,137
Due 5-10 Years, Amortized Cost	136,703
Due After 10 Years, Amortized Cost	433,533
Amortized Cost	788,889	$ 875,802
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due 1 Year or Less, Fair Value	65,296
Due 1-5 Years, Fair Value	150,036
Due 5-10 Years, Fair Value	133,541
Due After 10 Years, Fair Value	423,496
Fair Value	772,369	872,455	[1]
U.S. Government securities
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due 1 Year or Less, Amortized Cost	28,017
Due 1-5 Years, Amortized Cost	39,683
Due 5-10 Years, Amortized Cost	0
Due After 10 Years, Amortized Cost	0
Amortized Cost	67,700	70,203
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due 1 Year or Less, Fair Value	27,802
Due 1-5 Years, Fair Value	38,896
Due 5-10 Years, Fair Value	0
Due After 10 Years, Fair Value	0
Fair Value	66,698	69,559
Residential mortgage-backed securities — nonagency
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due 1 Year or Less, Amortized Cost	0
Due 1-5 Years, Amortized Cost	0
Due 5-10 Years, Amortized Cost	282
Due After 10 Years, Amortized Cost	80,437
Amortized Cost	80,719	115,639
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due 1 Year or Less, Fair Value	0
Due 1-5 Years, Fair Value	0
Due 5-10 Years, Fair Value	290
Due After 10 Years, Fair Value	82,417
Fair Value	82,707	118,710
Residential mortgage-backed securities — agency
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due 1 Year or Less, Amortized Cost	4,168
Due 1-5 Years, Amortized Cost	63,372
Due 5-10 Years, Amortized Cost	105,393
Due After 10 Years, Amortized Cost	352,758
Amortized Cost	525,691	582,845
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due 1 Year or Less, Fair Value	4,157
Due 1-5 Years, Fair Value	61,565
Due 5-10 Years, Fair Value	101,718
Due After 10 Years, Fair Value	340,346
Fair Value	507,786	575,849
Corporate securities
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due 1 Year or Less, Amortized Cost	33,331
Due 1-5 Years, Amortized Cost	50,082
Due 5-10 Years, Amortized Cost	31,028
Due After 10 Years, Amortized Cost	338
Amortized Cost	114,779	107,115
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due 1 Year or Less, Fair Value	33,337
Due 1-5 Years, Fair Value	49,575
Due 5-10 Years, Fair Value	31,533
Due After 10 Years, Fair Value	733
Fair Value	$ 115,178	$ 108,337
[1]	Derived from audited financial statements

Investment Securities - Held_2

Investment Securities - Held-to-maturity Security Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Amortized Cost:
1 Year or Less	$ 0
1-5 Years	0
5-10 Years	4,000
After 10 Years	9,000
Amortized Cost	13,000	$ 32,852	[1]
Fair Value:
1 Year or Less	0
1-5 Years	0
5-10 Years	3,998
After 10 Years	9,037
Total debt securities held-to-maturity	13,035	33,351
Asset-backed securities
Amortized Cost:
1 Year or Less	0
1-5 Years	0
5-10 Years	4,000
After 10 Years	9,000
Amortized Cost	13,000	22,692
Fair Value:
1 Year or Less	0
1-5 Years	0
5-10 Years	3,998
After 10 Years	9,037
Total debt securities held-to-maturity	13,035	22,951
Corporate securities
Amortized Cost:
1 Year or Less	0
1-5 Years	0
5-10 Years	0
After 10 Years	0
Amortized Cost	0	10,160
Fair Value:
1 Year or Less	0
1-5 Years	0
5-10 Years	0
After 10 Years	0
Total debt securities held-to-maturity	$ 0	$ 10,400
[1]	Derived from audited financial statements

Investment Securities - Summar

Investment Securities - Summary of Gross Unrealized Losses and Fair Value of Investments with Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 320,070	$ 393,140
Less than 12 Months, Unrealized Losses	8,274	2,992
12 Months or More, Fair Value	336,356	237,567
12 Months or More, Unrealized Losses	11,519	5,156
Total, Fair Value	656,426	630,707
Total, Unrealized Losses	19,793	8,148
U.S. Government securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	9,779	46,625
Less than 12 Months, Unrealized Losses	199	364
12 Months or More, Fair Value	56,919	20,436
12 Months or More, Unrealized Losses	803	280
Total, Fair Value	66,698	67,061
Total, Unrealized Losses	1,002	644
Residential mortgage-backed securities — nonagency
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	1,544	1,403
Less than 12 Months, Unrealized Losses	10	3
12 Months or More, Fair Value	3,242	6,269
12 Months or More, Unrealized Losses	80	109
Total, Fair Value	4,786	7,672
Total, Unrealized Losses	90	112
Residential mortgage-backed securities — agency
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	233,946	312,617
Less than 12 Months, Unrealized Losses	7,439	2,548
12 Months or More, Fair Value	269,757	210,862
12 Months or More, Unrealized Losses	10,554	4,767
Total, Fair Value	503,703	523,479
Total, Unrealized Losses	17,993	7,315
Corporate securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	74,801	32,495
Less than 12 Months, Unrealized Losses	626	77
12 Months or More, Fair Value	6,438	0
12 Months or More, Unrealized Losses	82	0
Total, Fair Value	81,239	32,495
Total, Unrealized Losses	$ 708	$ 77

Investment Securities - Held_3

Investment Securities - Held-to-maturity Securities, Continuous Unrealized Loss Position (Details) $ in Thousands	Sep. 30, 2018USD ($)
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	$ 3,998
Less than 12 months, Unrealized Losses	2
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Total, Fair Value	3,998
Total, Unrealized Losses	2
Asset-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Less than 12 months, Fair Value	3,998
Less than 12 months, Unrealized Losses	2
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Total, Fair Value	3,998
Total, Unrealized Losses	$ 2

Investment Securities - Narrat

Investment Securities - Narrative (Details) $ in Millions	3 Months Ended
	Jun. 30, 2018USD ($)	Sep. 30, 2018USD ($)investment_security	Dec. 31, 2017USD ($)
Investments, Debt and Equity Securities [Abstract]
Number of investments in unrealized loss position (investment securities) | investment_security		152
Corporate security transferred from held-to-maturity to available-for-sale	$ 10.1
Available-for-sale securities, sold at par value	$ 4
Available-for-sale securities pledged as collateral		$ 187.2	$ 116.1

Investment Securities - Gains

Investment Securities - Gains and Losses on Investment Securities Available-for-Sale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales and calls	$ 10,712	$ 6,810	$ 14,987	$ 71,588
Gross gains on sales and calls	188	3	438	121
Gross losses on sales and calls	(7)	0	(7)	(93)
Net realized gains on sales and calls	$ 181	$ 3	$ 431	$ 28

Loans - Summary (Details)

Loans - Summary (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 3,637,334		$ 3,532,193
Allowance for loan and lease losses	(34,789)	$ (33,335)	(28,750)	[1]	$ (26,842)	$ (27,988)	$ (26,598)
Loans, net	3,602,545		3,503,443	[1]
Total commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,686,819		1,706,995
Total commercial real estate | Construction, land & land development
Loans and Leases Receivable Disclosure [Line Items]
Loans	500,095		451,993
Total commercial real estate | Other commercial real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,186,724		1,255,002
Residential real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	329,470		333,086
Owner-occupied real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans	365,706		399,370
Commercial, financial & agricultural
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,159,294		973,440
Leases
Loans and Leases Receivable Disclosure [Line Items]
Loans	30,410		52,396
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 65,635		$ 66,906
[1]	Derived from audited financial statements

Loans - Organic (Details)

Loans - Organic (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Loans
Loans	$ 3,637,334		$ 3,532,193
Allowance for loan and lease losses	(34,789)	$ (33,335)	(28,750)	[1]	$ (26,842)	$ (27,988)	$ (26,598)
Loans, net	3,602,545		3,503,443	[1]
Net deferred loan fees	10,300		9,300
Total commercial real estate
Loans
Loans	1,686,819		1,706,995
Total commercial real estate | Construction, land & land development
Loans
Loans	500,095		451,993
Total commercial real estate | Other commercial real estate
Loans
Loans	1,186,724		1,255,002
Residential real estate
Loans
Loans	329,470		333,086
Owner-occupied real estate
Loans
Loans	365,706		399,370
Commercial, financial & agricultural
Loans
Loans	1,159,294		973,440
Leases
Loans
Loans	30,410		52,396
Consumer
Loans
Loans	65,635		66,906
Organic Loans
Loans
Loans	2,786,843		2,365,843
Allowance for loan and lease losses	(27,427)	(26,366)	(24,039)		(22,709)	(22,560)	(21,086)
Loans, net	2,759,416		2,341,804
Organic Loans | Total commercial real estate
Loans
Loans	1,419,788		1,362,134
Allowance for loan and lease losses	(11,487)	(12,154)	(13,037)		(13,060)	(13,337)	(11,767)
Organic Loans | Total commercial real estate | Construction, land & land development
Loans
Loans	480,530		412,540
Organic Loans | Total commercial real estate | Other commercial real estate
Loans
Loans	939,258		949,594
Organic Loans | Residential real estate
Loans
Loans	238,292		196,225
Allowance for loan and lease losses	(2,486)	(2,412)	(2,809)		(1,976)	(1,841)	(1,786)
Organic Loans | Owner-occupied real estate
Loans
Loans	275,095		260,273
Allowance for loan and lease losses	(3,450)	(2,954)	(2,075)		(2,410)	(2,036)	(2,239)
Organic Loans | Commercial, financial & agricultural
Loans
Loans	758,897		430,205
Allowance for loan and lease losses	(8,951)	(7,438)	(4,535)		(3,682)	(3,663)	(4,093)
Organic Loans | Leases
Loans
Loans	30,410		52,396
Allowance for loan and lease losses	(345)	(411)	(629)		(696)	(825)	(655)
Organic Loans | Consumer
Loans
Loans	64,361		64,610
Allowance for loan and lease losses	$ (708)	$ (997)	$ (954)		$ (885)	$ (858)	$ (546)
[1]	Derived from audited financial statements

Loans - Purchased Non-Credit I

Loans - Purchased Non-Credit Impaired (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Loans
Loans	$ 3,637,334		$ 3,532,193
Allowance for loan and lease losses	(34,789)	$ (33,335)	(28,750)	[1]	$ (26,842)	$ (27,988)	$ (26,598)
Loans, net	3,602,545		3,503,443	[1]
Net discounts	6,100		12,700
Total commercial real estate
Loans
Loans	1,686,819		1,706,995
Residential real estate
Loans
Loans	329,470		333,086
Owner-occupied real estate
Loans
Loans	365,706		399,370
Commercial, financial & agricultural
Loans
Loans	1,159,294		973,440
Consumer
Loans
Loans	65,635		66,906
Construction, land & land development | Total commercial real estate
Loans
Loans	500,095		451,993
Other commercial real estate | Total commercial real estate
Loans
Loans	1,186,724		1,255,002
Purchased Non-Credit Impaired Loans
Loans
Loans	725,741		990,736
Allowance for loan and lease losses	(3,389)	(2,981)	(995)		(900)	(667)	(439)
Loans, net	722,352		989,741
Purchased Non-Credit Impaired Loans | Total commercial real estate
Loans
Loans	199,840		244,568
Allowance for loan and lease losses	(348)	(292)	(230)		(189)	(145)	(88)
Purchased Non-Credit Impaired Loans | Residential real estate
Loans
Loans	61,141		96,529
Allowance for loan and lease losses	(256)	(334)	(664)		(460)	(342)	(72)
Purchased Non-Credit Impaired Loans | Owner-occupied real estate
Loans
Loans	73,466		118,294
Allowance for loan and lease losses	(480)	(441)	(88)		(220)	(152)	(44)
Purchased Non-Credit Impaired Loans | Commercial, financial & agricultural
Loans
Loans	390,097		529,184
Allowance for loan and lease losses	(2,303)	(1,910)	(8)		(28)	(26)	(235)
Purchased Non-Credit Impaired Loans | Consumer
Loans
Loans	1,197		2,161
Allowance for loan and lease losses	(2)	$ (4)	(5)		$ (3)	$ (2)	$ 0
Purchased Non-Credit Impaired Loans | Construction, land & land development | Total commercial real estate
Loans
Loans	13,284		25,908
Purchased Non-Credit Impaired Loans | Other commercial real estate | Total commercial real estate
Loans
Loans	$ 186,556		$ 218,660
[1]	Derived from audited financial statements

Loans - Purchased Credit Impai

Loans - Purchased Credit Impaired (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017		Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Loans
Loans	$ 3,637,334		$ 3,532,193
Allowance for loan and lease losses	(34,789)	$ (33,335)	(28,750)	[1]	$ (26,842)	$ (27,988)	$ (26,598)
Loans, net	3,602,545		3,503,443	[1]
Total commercial real estate
Loans
Loans	1,686,819		1,706,995
Residential real estate
Loans
Loans	329,470		333,086
Owner-occupied real estate
Loans
Loans	365,706		399,370
Commercial, financial & agricultural
Loans
Loans	1,159,294		973,440
Consumer
Loans
Loans	65,635		66,906
Construction, land & land development | Total commercial real estate
Loans
Loans	500,095		451,993
Other commercial real estate | Total commercial real estate
Loans
Loans	1,186,724		1,255,002
Purchased Credit Impaired Loans
Loans
Loans	124,750		175,614
Allowance for loan and lease losses	(3,973)	(3,988)	(3,716)		(3,233)	(4,761)	(5,073)
Loans, net	120,777		171,898
Purchased Credit Impaired Loans | Total commercial real estate
Loans
Loans	67,191		100,293
Allowance for loan and lease losses	(1,793)	(2,172)	(1,706)		(1,457)	(2,131)	(2,183)
Purchased Credit Impaired Loans | Residential real estate
Loans
Loans	30,037		40,332
Allowance for loan and lease losses	(1,165)	(786)	(1,242)		(1,228)	(968)	(1,196)
Purchased Credit Impaired Loans | Owner-occupied real estate
Loans
Loans	17,145		20,803
Allowance for loan and lease losses	(805)	(816)	(718)		(498)	(1,611)	(1,655)
Purchased Credit Impaired Loans | Commercial, financial & agricultural
Loans
Loans	10,300		14,051
Allowance for loan and lease losses	(210)	(214)	(42)		(36)	(37)	(38)
Purchased Credit Impaired Loans | Consumer
Loans
Loans	77		135
Allowance for loan and lease losses	0	$ 0	(8)		$ (14)	$ (14)	$ (1)
Purchased Credit Impaired Loans | Construction, land & land development | Total commercial real estate
Loans
Loans	6,281		13,545
Purchased Credit Impaired Loans | Other commercial real estate | Total commercial real estate
Loans
Loans	$ 60,910		$ 86,748
[1]	Derived from audited financial statements

Loans - Changes in Carrying Va

Loans - Changes in Carrying Values of Purchased Credit Impaired Loans (Details) - Purchased Credit Impaired Loans - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Changes in Carrying Value of Purchased Credit Impaired Loans
Balance, beginning of period	$ 144,474	$ 130,837	$ 171,898	$ 155,573
Accretion of fair value discounts	8,154	6,520	20,695	23,425
Fair value of acquired loans	0	77,551	0	77,551
Reductions in principal balances resulting from repayments, write-offs and foreclosures	(31,866)	(16,009)	(71,559)	(57,962)
Change in the allowance for loan and lease losses on purchased credit impaired loans	15	1,528	(257)	1,840
Balance, end of period	$ 120,777	$ 200,427	$ 120,777	$ 200,427

Loans - Changes in Accretable

Loans - Changes in Accretable Discount (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Changes in Accretable Discount
Balance, beginning of period	$ 53,538	$ 59,808	$ 57,927	$ 69,301
Additions from acquisitions	0	11,664	0	11,664
Accretion	(8,154)	(6,520)	(20,695)	(23,425)
Transfers to accretable discounts and exit events, net	515	2,244	8,667	9,656
Balance, end of period	$ 45,899	$ 67,196	$ 45,899	$ 67,196

Loans - Narrative (Details)

Loans - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
Loans pledged as collateral	$ 3,100,000	$ 3,100,000
Consumer mortgage loans secured by residential real estate in process of foreclosure	$ 20

Allowance for Loan and Lease _3

Allowance for Loan and Lease Losses (ALLL) - Allowance for Loan Losses Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 33,335	$ 27,988	$ 28,750	[1]	$ 26,598
Charge-offs	(901)	(1,707)	(2,184)		(3,356)
Recoveries	146	146	413		338
Net (charge-offs) recoveries	(755)	(1,561)	(1,771)		(3,018)
Provision for loan and lease losses	2,209	415	7,810		3,262
Balance, end of period	34,789	26,842	34,789		26,842
Organic Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	26,366	22,560	24,039		21,086
Charge-offs	(326)	(912)	(1,161)		(1,988)
Recoveries	87	106	290		296
Net (charge-offs) recoveries	(239)	(806)	(871)		(1,692)
Provision for loan and lease losses	1,300	955	4,259		3,315
Balance, end of period	27,427	22,709	27,427		22,709
Purchased Non-Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,981	667	995		439
Charge-offs	(451)	(152)	(776)		(397)
Recoveries	59	40	123		42
Net (charge-offs) recoveries	(392)	(112)	(653)		(355)
Provision for loan and lease losses	800	345	3,047		816
Balance, end of period	3,389	900	3,389		900
Purchased Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	3,988	4,761	3,716		5,073
Charge-offs	(124)	(643)	(247)		(971)
Recoveries	0	0	0		0
Net (charge-offs) recoveries	(124)	(643)	(247)		(971)
Provision for loan and lease losses	109	(885)	504		(869)
Balance, end of period	$ 3,973	$ 3,233	$ 3,973		$ 3,233
[1]	Derived from audited financial statements

Allowance for Loan and Lease _4

Allowance for Loan and Lease Losses (ALLL) - Organic Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017	Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 33,335	$ 27,988	$ 28,750	[1]	$ 26,598
Charge-offs	(901)	(1,707)	(2,184)		(3,356)
Recoveries	146	146	413		338
Provision	2,209	415	7,810		3,262
Balance, end of period	34,789	26,842	34,789		26,842
Organic Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	26,366	22,560	24,039		21,086
Charge-offs	(326)	(912)	(1,161)		(1,988)
Recoveries	87	106	290		296
Provision	1,300	955	4,259		3,315
Balance, end of period	27,427	22,709	27,427		22,709
Allowance attributable to loans, Individually evaluated for impairment	133		133			$ 99
Allowance attributable to loans, Collectively evaluated for impairment	27,294		27,294			23,940
Loans individually evaluated for impairment	13,505		13,505			4,959
Loans collectively evaluated for impairment	2,773,338		2,773,338			2,360,884
Total Loans	2,786,843		2,786,843			2,365,843
Total commercial real estate | Organic Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	12,154	13,337	13,037		11,767
Charge-offs	0	(746)	(277)		(933)
Recoveries	1	0	21		0
Provision	(668)	469	(1,294)		2,226
Balance, end of period	11,487	13,060	11,487		13,060
Allowance attributable to loans, Individually evaluated for impairment	0		0			0
Allowance attributable to loans, Collectively evaluated for impairment	11,487		11,487			13,037
Loans individually evaluated for impairment	2,799		2,799			3,822
Loans collectively evaluated for impairment	1,416,989		1,416,989			1,358,312
Total Loans	1,419,788		1,419,788			1,362,134
Residential real estate | Organic Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,412	1,841	2,809		1,786
Charge-offs	(28)	0	(240)		(48)
Recoveries	14	3	24		9
Provision	88	132	(107)		229
Balance, end of period	2,486	1,976	2,486		1,976
Allowance attributable to loans, Individually evaluated for impairment	0		0			0
Allowance attributable to loans, Collectively evaluated for impairment	2,486		2,486			2,809
Loans individually evaluated for impairment	1,333		1,333			49
Loans collectively evaluated for impairment	236,959		236,959			196,176
Total Loans	238,292		238,292			196,225
Owner-occupied real estate | Organic Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,954	2,036	2,075		2,239
Charge-offs	0	0	0		0
Recoveries	0	0	0		0
Provision	496	374	1,375		171
Balance, end of period	3,450	2,410	3,450		2,410
Allowance attributable to loans, Individually evaluated for impairment	25		25			65
Allowance attributable to loans, Collectively evaluated for impairment	3,425		3,425			2,010
Loans individually evaluated for impairment	3,456		3,456			808
Loans collectively evaluated for impairment	271,639		271,639			259,465
Total Loans	275,095		275,095			260,273
Commercial, financial & agricultural | Organic Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	7,438	3,663	4,535		4,093
Charge-offs	(201)	(98)	(360)		(240)
Recoveries	50	20	156		71
Provision	1,664	97	4,620		(242)
Balance, end of period	8,951	3,682	8,951		3,682
Allowance attributable to loans, Individually evaluated for impairment	108		108			34
Allowance attributable to loans, Collectively evaluated for impairment	8,843		8,843			4,501
Loans individually evaluated for impairment	5,917		5,917			280
Loans collectively evaluated for impairment	752,980		752,980			429,925
Total Loans	758,897		758,897			430,205
Leases | Organic Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	411	825	629		655
Charge-offs	(39)	(2)	(119)		(501)
Recoveries	4	67	37		176
Provision	(31)	(194)	(202)		366
Balance, end of period	345	696	345		696
Allowance attributable to loans, Individually evaluated for impairment	0		0			0
Allowance attributable to loans, Collectively evaluated for impairment	345		345			629
Loans individually evaluated for impairment	0		0			0
Loans collectively evaluated for impairment	30,410		30,410			52,396
Total Loans	30,410		30,410			52,396
Consumer | Organic Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	997	858	954		546
Charge-offs	(58)	(66)	(165)		(266)
Recoveries	18	16	52		40
Provision	(249)	77	(133)		565
Balance, end of period	708	$ 885	708		$ 885
Allowance attributable to loans, Individually evaluated for impairment	0		0			0
Allowance attributable to loans, Collectively evaluated for impairment	708		708			954
Loans individually evaluated for impairment	0		0			0
Loans collectively evaluated for impairment	64,361		64,361			64,610
Total Loans	$ 64,361		$ 64,361			$ 64,610
[1]	Derived from audited financial statements

Allowance for Loan and Lease _5

Allowance for Loan and Lease Losses (ALLL) - Purchased Non-Credit Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017	Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 33,335	$ 27,988	$ 28,750	[1]	$ 26,598
Charge-offs	(901)	(1,707)	(2,184)		(3,356)
Recoveries	146	146	413		338
Provision	2,209	415	7,810		3,262
Balance, end of period	34,789	26,842	34,789		26,842
Purchased Non-Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,981	667	995		439
Charge-offs	(451)	(152)	(776)		(397)
Recoveries	59	40	123		42
Provision	800	345	3,047		816
Balance, end of period	3,389	900	3,389		900
Allowance attributable to loans, Individually evaluated for impairment	653		653			$ 8
Allowance attributable to loans, Collectively evaluated for impairment	2,736		2,736			987
Loans individually evaluated for impairment	56,672		56,672			4,774
Loans collectively evaluated for impairment	669,069		669,069			985,962
Total Loans	725,741		725,741			990,736
Commercial real estate | Purchased Non-Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	292	145	230		88
Charge-offs	(406)	(50)	(406)		(50)
Recoveries	23	1	30		1
Provision	439	93	494		150
Balance, end of period	348	189	348		189
Allowance attributable to loans, Individually evaluated for impairment	0		0			0
Allowance attributable to loans, Collectively evaluated for impairment	348		348			230
Loans individually evaluated for impairment	0		0			0
Loans collectively evaluated for impairment	199,840		199,840			244,568
Total Loans	199,840		199,840			244,568
Residential real estate | Purchased Non-Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	334	342	664		72
Charge-offs	(44)	(7)	(80)		(7)
Recoveries	8	5	18		5
Provision	(42)	120	(346)		390
Balance, end of period	256	460	256		460
Allowance attributable to loans, Individually evaluated for impairment	0		0			0
Allowance attributable to loans, Collectively evaluated for impairment	256		256			664
Loans individually evaluated for impairment	181		181			19
Loans collectively evaluated for impairment	60,960		60,960			96,510
Total Loans	61,141		61,141			96,529
Owner-occupied real estate | Purchased Non-Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	441	152	88		44
Charge-offs	0	0	(249)		(80)
Recoveries	9	0	30		0
Provision	30	68	611		256
Balance, end of period	480	220	480		220
Allowance attributable to loans, Individually evaluated for impairment	24		24			0
Allowance attributable to loans, Collectively evaluated for impairment	456		456			88
Loans individually evaluated for impairment	823		823			3,264
Loans collectively evaluated for impairment	72,643		72,643			115,030
Total Loans	73,466		73,466			118,294
Commercial, financial & agricultural | Purchased Non-Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	1,910	26	8		235
Charge-offs	0	(91)	(37)		(251)
Recoveries	18	32	42		32
Provision	375	61	2,290		12
Balance, end of period	2,303	28	2,303		28
Allowance attributable to loans, Individually evaluated for impairment	629		629			8
Allowance attributable to loans, Collectively evaluated for impairment	1,674		1,674			0
Loans individually evaluated for impairment	55,668		55,668			1,491
Loans collectively evaluated for impairment	334,429		334,429			527,693
Total Loans	390,097		390,097			529,184
Consumer | Purchased Non-Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	4	2	5		0
Charge-offs	(1)	(4)	(4)		(9)
Recoveries	1	2	3		4
Provision	(2)	3	(2)		8
Balance, end of period	2	$ 3	2		$ 3
Allowance attributable to loans, Individually evaluated for impairment	0		0			0
Allowance attributable to loans, Collectively evaluated for impairment	2		2			5
Loans individually evaluated for impairment	0		0			0
Loans collectively evaluated for impairment	1,197		1,197			2,161
Total Loans	$ 1,197		$ 1,197			$ 2,161
[1]	Derived from audited financial statements

Allowance for Loan and Lease _6

Allowance for Loan and Lease Losses (ALLL) - Purchased Credit Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017	Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 33,335	$ 27,988	$ 28,750	[1]	$ 26,598
Charge-offs	(901)	(1,707)	(2,184)		(3,356)
Recoveries	146	146	413		338
Provision for loan and lease losses	2,209	415	7,810		3,262
Balance, end of period	34,789	26,842	34,789		26,842
Purchased Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	3,988	4,761	3,716		5,073
Charge-offs	(124)	(643)	(247)		(971)
Recoveries	0	0	0		0
Provision for loan and lease losses	109	(885)	504		(869)
Balance, end of period	3,973	3,233	3,973		3,233
Allowance attributable to loans, Individually evaluated for impairment	1,764		1,764			$ 1,798
Allowance attributable to loans, Collectively evaluated for impairment	2,209		2,209			1,918
Loans individually evaluated for impairment	65,664		65,664			93,915
Loans collectively evaluated for impairment	59,086		59,086			81,699
Total Loans	124,750		124,750			175,614
Total commercial real estate | Purchased Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,172	2,131	1,706		2,183
Charge-offs	0	(168)	(34)		(401)
Recoveries	0	0	0		0
Provision for loan and lease losses	(379)	(506)	121		(325)
Balance, end of period	1,793	1,457	1,793		1,457
Allowance attributable to loans, Individually evaluated for impairment	996		996			1,052
Allowance attributable to loans, Collectively evaluated for impairment	797		797			654
Loans individually evaluated for impairment	55,816		55,816			79,085
Loans collectively evaluated for impairment	11,375		11,375			21,208
Total Loans	67,191		67,191			100,293
Residential real estate | Purchased Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	786	968	1,242		1,196
Charge-offs	(1)	(50)	(74)		(92)
Recoveries	0	0	0		0
Provision for loan and lease losses	380	310	(3)		124
Balance, end of period	1,165	1,228	1,165		1,228
Allowance attributable to loans, Individually evaluated for impairment	68		68			128
Allowance attributable to loans, Collectively evaluated for impairment	1,097		1,097			1,114
Loans individually evaluated for impairment	2,257		2,257			3,029
Loans collectively evaluated for impairment	27,780		27,780			37,303
Total Loans	30,037		30,037			40,332
Owner-occupied real estate | Purchased Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	816	1,611	718		1,655
Charge-offs	(123)	(416)	(133)		(452)
Recoveries	0	0	0		0
Provision for loan and lease losses	112	(697)	220		(705)
Balance, end of period	805	498	805		498
Allowance attributable to loans, Individually evaluated for impairment	695		695			586
Allowance attributable to loans, Collectively evaluated for impairment	110		110			132
Loans individually evaluated for impairment	7,539		7,539			9,483
Loans collectively evaluated for impairment	9,606		9,606			11,320
Total Loans	17,145		17,145			20,803
Commercial, financial & agricultural | Purchased Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	214	37	42		38
Charge-offs	0	(6)	0		(22)
Recoveries	0	0	0		0
Provision for loan and lease losses	(4)	5	168		20
Balance, end of period	210	36	210		36
Allowance attributable to loans, Individually evaluated for impairment	5		5			32
Allowance attributable to loans, Collectively evaluated for impairment	205		205			10
Loans individually evaluated for impairment	52		52			2,318
Loans collectively evaluated for impairment	10,248		10,248			11,733
Total Loans	10,300		10,300			14,051
Consumer | Purchased Credit Impaired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	0	14	8		1
Charge-offs	0	(3)	(6)		(4)
Recoveries	0	0	0		0
Provision for loan and lease losses	0	3	(2)		17
Balance, end of period	0	$ 14	0		$ 14
Allowance attributable to loans, Individually evaluated for impairment	0		0			0
Allowance attributable to loans, Collectively evaluated for impairment	0		0			8
Loans individually evaluated for impairment	0		0			0
Loans collectively evaluated for impairment	77		77			135
Total Loans	$ 77		$ 77			$ 135
[1]	Derived from audited financial statements

Allowance for Loan and Lease _7

Allowance for Loan and Lease Losses (ALLL) - Organic Impaired Loans (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	$ 51,907,000		$ 51,907,000		$ 12,114,000
Recorded Investment with No Related Allowance	49,587,000		49,587,000		10,294,000
Unpaid Principal Balance with Related Allowance	25,053,000		25,053,000		2,870,000
Recorded Investment with Related Allowance	24,440,000		24,440,000		2,748,000
Impaired financing receivable, related allowance	2,068,000		2,068,000		1,238,000
Unpaid Principal Balance	76,960,000		76,960,000		14,984,000
Recorded Investment	74,027,000		74,027,000		13,042,000
Average Recorded Investment	74,165,000	$ 11,799,000	60,351,000	$ 14,929,000
Interest Income Recognized	548,000	0	1,591,000	1,000
Average recorded investment for TDRs	6,400,000	0	6,800,000	2,700,000
Interest income recognized on troubled debt restructurings	60,000	0	191,000	0
Total commercial real estate
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	2,827,000		2,827,000		4,699,000
Recorded Investment with No Related Allowance	2,822,000		2,822,000		3,901,000
Unpaid Principal Balance with Related Allowance	178,000		178,000		113,000
Recorded Investment with Related Allowance	177,000		177,000		112,000
Impaired financing receivable, related allowance	88,000		88,000		56,000
Average Recorded Investment	3,002,000	4,493,000	3,328,000	7,420,000
Interest Income Recognized	0	0	16,000	0
Residential real estate
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	2,579,000		2,579,000		453,000
Recorded Investment with No Related Allowance	2,345,000		2,345,000		456,000
Unpaid Principal Balance with Related Allowance	694,000		694,000		1,452,000
Recorded Investment with Related Allowance	619,000		619,000		1,399,000
Impaired financing receivable, related allowance	310,000		310,000		699,000
Average Recorded Investment	3,274,000	1,120,000	3,824,000	1,154,000
Interest Income Recognized	0	0	0	0
Owner-occupied real estate
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	1,620,000		1,620,000		4,172,000
Recorded Investment with No Related Allowance	1,554,000		1,554,000		4,015,000
Unpaid Principal Balance with Related Allowance	3,544,000		3,544,000		350,000
Recorded Investment with Related Allowance	3,411,000		3,411,000		335,000
Impaired financing receivable, related allowance	331,000		331,000		125,000
Average Recorded Investment	5,021,000	3,446,000	4,406,000	3,500,000
Interest Income Recognized	0	0	0	0
Commercial, financial & agricultural
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	44,851,000		44,851,000		2,739,000
Recorded Investment with No Related Allowance	42,844,000		42,844,000		1,882,000
Unpaid Principal Balance with Related Allowance	20,376,000		20,376,000		872,000
Recorded Investment with Related Allowance	20,160,000		20,160,000		821,000
Impaired financing receivable, related allowance	1,303,000		1,303,000		318,000
Average Recorded Investment	62,768,000	2,653,000	48,672,000	2,761,000
Interest Income Recognized	548,000	0	1,575,000	1,000
Consumer
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	30,000		30,000		51,000
Recorded Investment with No Related Allowance	22,000		22,000		40,000
Unpaid Principal Balance with Related Allowance	261,000		261,000		83,000
Recorded Investment with Related Allowance	73,000		73,000		81,000
Impaired financing receivable, related allowance	36,000		36,000		40,000
Average Recorded Investment	100,000	87,000	121,000	94,000
Interest Income Recognized	0	0	0	0
SBA Loans
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,000,000		5,000,000		5,700,000
Construction, land & land development | Total commercial real estate
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	26,000		26,000		82,000
Recorded Investment with No Related Allowance	23,000		23,000		79,000
Unpaid Principal Balance with Related Allowance	178,000		178,000		113,000
Recorded Investment with Related Allowance	177,000		177,000		112,000
Impaired financing receivable, related allowance	88,000		88,000		56,000
Average Recorded Investment	202,000	146,000	156,000	2,862,000
Interest Income Recognized	0	0	0	0
Other commercial real estate | Total commercial real estate
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance with No Related Allowance	2,801,000		2,801,000		4,617,000
Recorded Investment with No Related Allowance	2,799,000		2,799,000		3,822,000
Unpaid Principal Balance with Related Allowance	0		0		0
Recorded Investment with Related Allowance	0		0		0
Impaired financing receivable, related allowance	0		0		$ 0
Average Recorded Investment	2,800,000	4,347,000	3,172,000	4,558,000
Interest Income Recognized	$ 0	$ 0	$ 16,000	$ 0

Allowance for Loan and Lease _8

Allowance for Loan and Lease Losses (ALLL) - Organic Nonaccrual Loans (Details) - Organic and Purchased Non-Credit Impaired Loans - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Recorded Investment, Nonaccrual Loans	$ 32,855	$ 12,477
Total commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, Nonaccrual Loans	2,999	3,448
Total commercial real estate | Construction, land & land development
Financing Receivable, Impaired [Line Items]
Recorded Investment, Nonaccrual Loans	200	191
Total commercial real estate | Other commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, Nonaccrual Loans	2,799	3,257
Residential real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, Nonaccrual Loans	2,964	1,855
Owner-occupied real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment, Nonaccrual Loans	4,965	4,350
Commercial, financial & agricultural
Financing Receivable, Impaired [Line Items]
Recorded Investment, Nonaccrual Loans	21,832	2,703
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment, Nonaccrual Loans	$ 95	$ 121

Allowance for Loan and Lease _9

Allowance for Loan and Lease Losses (ALLL) - Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 3,637,334	$ 3,532,193	[1]
Organic Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,418	4,761
Current	2,777,425	2,361,082
Total Loans	2,786,843	2,365,843
Loans greater than 90 Days and Accruing	0	0
Organic Loans | Total commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	316	532
Current	1,419,472	1,361,602
Total Loans	1,419,788	1,362,134
Loans greater than 90 Days and Accruing	0	0
Organic Loans | Total commercial real estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	316	532
Current	480,214	412,008
Total Loans	480,530	412,540
Loans greater than 90 Days and Accruing	0	0
Organic Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	939,258	949,594
Total Loans	939,258	949,594
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	1,010	1,960
Current	237,282	194,265
Total Loans	238,292	196,225
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	5,728	1,187
Current	269,367	259,086
Total Loans	275,095	260,273
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	2,284	987
Current	756,613	429,218
Total Loans	758,897	430,205
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	30,410	52,396
Total Loans	30,410	52,396
Loans greater than 90 Days and Accruing	0	0
Organic Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	80	95
Current	64,281	64,515
Total Loans	64,361	64,610
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	19,784	3,925
Current	705,957	986,811
Total Loans	725,741	990,736
Loans greater than 90 Days and Accruing	0	0
Purchased Non-Credit Impaired Loans | Total commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	80
Current	199,840	244,488
Total Loans	199,840	244,568
Loans greater than 90 Days and Accruing	0	0
Purchased Non-Credit Impaired Loans | Total commercial real estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	35
Current	13,284	25,873
Total Loans	13,284	25,908
Loans greater than 90 Days and Accruing	0	0
Purchased Non-Credit Impaired Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	45
Current	186,556	218,615
Total Loans	186,556	218,660
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	371	663
Current	60,770	95,866
Total Loans	61,141	96,529
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	156	1,873
Current	73,310	116,421
Total Loans	73,466	118,294
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	19,239	1,268
Current	370,858	527,916
Total Loans	390,097	529,184
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	18	41
Current	1,179	2,120
Total Loans	1,197	2,161
Loans greater than 90 Days and Accruing	0	0
Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,333	10,254
Current	116,417	165,360
Total Loans	124,750	175,614
Purchased Credit Impaired Loans | Total commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,189	5,548
Current	63,002	94,745
Total Loans	67,191	100,293
Purchased Credit Impaired Loans | Total commercial real estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,776	1,882
Current	4,505	11,663
Total Loans	6,281	13,545
Purchased Credit Impaired Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,413	3,666
Current	58,497	83,082
Total Loans	60,910	86,748
Purchased Credit Impaired Loans | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,161	3,395
Current	27,876	36,937
Total Loans	30,037	40,332
Purchased Credit Impaired Loans | Owner-occupied real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	556	871
Current	16,589	19,932
Total Loans	17,145	20,803
Purchased Credit Impaired Loans | Commercial, financial & agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,427	425
Current	8,873	13,626
Total Loans	10,300	14,051
Purchased Credit Impaired Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	15
Current	77	120
Total Loans	77	135
30 - 89 Days Past Due | Organic Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,714	3,761
30 - 89 Days Past Due | Organic Loans | Total commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	186	487
30 - 89 Days Past Due | Organic Loans | Total commercial real estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	186	487
30 - 89 Days Past Due | Organic Loans | Total commercial real estate | Other commercial 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	960	1,868
30 - 89 Days Past Due | Organic Loans | Owner-occupied real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,761	474
30 - 89 Days Past Due | Organic Loans | Commercial, financial & agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,749	865
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	58	67
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	19,330	1,523
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans | Total commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	35
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans | Total commercial real estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	35
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	326	537
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	156	283
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans | Commercial, financial & agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	18,848	640
30 - 89 Days Past Due | Purchased Non-Credit Impaired Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	28
30 - 89 Days Past Due | Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,438	2,169
30 - 89 Days Past Due | Purchased Credit Impaired Loans | Total commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	47	364
30 - 89 Days Past Due | Purchased Credit Impaired Loans | Total commercial real estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11	1
30 - 89 Days Past Due | Purchased Credit Impaired Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	36	363
30 - 89 Days Past Due | Purchased Credit Impaired Loans | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	975	1,519
30 - 89 Days Past Due | Purchased Credit Impaired Loans | Owner-occupied real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	416	85
30 - 89 Days Past Due | Purchased Credit Impaired Loans | Commercial, financial & agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	201
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	1,704	1,000
90 Days or Greater Past Due | Organic Loans | Total commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	130	45
90 Days or Greater Past Due | Organic Loans | Total commercial real estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	130	45
90 Days or Greater Past Due | Organic Loans | Total commercial real estate | Other commercial 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	50	92
90 Days or Greater Past Due | Organic Loans | Owner-occupied real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	967	713
90 Days or Greater Past Due | Organic Loans | Commercial, financial & agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	535	122
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	22	28
90 Days or Greater Past Due | Purchased Non-Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	454	2,402
90 Days or Greater Past Due | Purchased Non-Credit Impaired Loans | Total commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	45
90 Days or Greater Past Due | Purchased Non-Credit Impaired Loans | Total 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 | Total commercial real estate | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	45
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	45	126
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	0	1,590
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	391	628
90 Days or Greater Past Due | Purchased Non-Credit Impaired Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	18	13
90 Days or Greater Past Due | Purchased Credit Impaired Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,895	8,085
90 Days or Greater Past Due | Purchased Credit Impaired Loans | Total commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,142	5,184
90 Days or Greater Past Due | Purchased Credit Impaired Loans | Total commercial real estate | Construction, land & land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,765	1,881
90 Days or Greater Past Due | Purchased Credit Impaired Loans | Total commercial real estate | Other commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,377	3,303
90 Days or Greater Past Due | Purchased Credit Impaired Loans | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,186	1,876
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	140	786
90 Days or Greater Past Due | Purchased Credit Impaired Loans | Commercial, financial & agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,427	224
90 Days or Greater Past Due | Purchased Credit Impaired Loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 0	$ 15
[1]	Derived from audited financial statements

Allowance for Loan and Lease_10

Allowance for Loan and Lease Losses (ALLL) - Credit Quality of Organic Loans (Details) - Organic Loans - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	$ 2,786,843	$ 2,365,843
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	2,589,748	2,254,814
Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	167,940	94,143
OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	9,070	8,210
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	19,955	8,676
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	130	0
Total commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,419,788	1,362,134
Total commercial real estate | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	480,530	412,540
Total commercial real estate | Other commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	939,258	949,594
Total commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,355,485	1,291,526
Total commercial real estate | Pass | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	453,014	371,358
Total commercial real estate | Pass | Other commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	902,471	920,168
Total commercial real estate | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	54,326	61,168
Total commercial real estate | Watch | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	20,906	38,939
Total commercial real estate | Watch | Other commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	33,420	22,229
Total commercial real estate | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	6,906	5,451
Total commercial real estate | OAEM | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	6,350	2,086
Total commercial real estate | OAEM | Other commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	556	3,365
Total commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	2,941	3,989
Total commercial real estate | Substandard | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	130	157
Total commercial real estate | Substandard | Other commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	2,811	3,832
Total commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	130	0
Total commercial real estate | Doubtful | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	130	0
Total commercial real estate | Doubtful | Other commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	238,292	196,225
Residential real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	230,722	188,918
Residential real estate | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	4,254	3,668
Residential real estate | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	401	1,488
Residential real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	2,915	2,151
Residential real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Owner-occupied real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	275,095	260,273
Owner-occupied real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	236,779	240,987
Owner-occupied real estate | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	30,673	16,891
Owner-occupied real estate | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	667	1,067
Owner-occupied real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	6,976	1,328
Owner-occupied real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Commercial, financial & agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	758,897	430,205
Commercial, financial & agricultural | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	673,850	421,114
Commercial, financial & agricultural | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	76,901	7,870
Commercial, financial & agricultural | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,096	123
Commercial, financial & agricultural | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	7,050	1,098
Commercial, financial & agricultural | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Leases
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	30,410	52,396
Leases | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	28,749	47,908
Leases | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,661	4,488
Leases | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Leases | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Leases | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	64,361	64,610
Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	64,163	64,361
Consumer | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	125	58
Consumer | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	81
Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	73	110
Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	$ 0	$ 0

Allowance for Loan and Lease_11

Allowance for Loan and Lease Losses (ALLL) - Credit Quality of Purchased Non-Credit Impaired Loans (Details) - Purchased Non-Credit Impaired Loans - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable [Line Items]
Loans Receivable	$ 725,741	$ 990,736
Pass
Financing Receivable [Line Items]
Loans Receivable	542,061	897,468
Watch
Financing Receivable [Line Items]
Loans Receivable	108,575	66,478
OAEM
Financing Receivable [Line Items]
Loans Receivable	31,380	9,119
Substandard
Financing Receivable [Line Items]
Loans Receivable	43,634	17,607
Doubtful
Financing Receivable [Line Items]
Loans Receivable	91	64
Total commercial real estate
Financing Receivable [Line Items]
Loans Receivable	199,840	244,568
Total commercial real estate | Pass
Financing Receivable [Line Items]
Loans Receivable	158,419	240,402
Total commercial real estate | Watch
Financing Receivable [Line Items]
Loans Receivable	39,121	1,726
Total commercial real estate | OAEM
Financing Receivable [Line Items]
Loans Receivable	1,752	1,825
Total commercial real estate | Substandard
Financing Receivable [Line Items]
Loans Receivable	548	615
Total commercial real estate | Doubtful
Financing Receivable [Line Items]
Loans Receivable	0	0
Total commercial real estate | Construction, land & land development
Financing Receivable [Line Items]
Loans Receivable	13,284	25,908
Total commercial real estate | Construction, land & land development | Pass
Financing Receivable [Line Items]
Loans Receivable	13,217	25,486
Total commercial real estate | Construction, land & land development | Watch
Financing Receivable [Line Items]
Loans Receivable	43	385
Total commercial real estate | Construction, land & land development | OAEM
Financing Receivable [Line Items]
Loans Receivable	0	0
Total commercial real estate | Construction, land & land development | Substandard
Financing Receivable [Line Items]
Loans Receivable	24	37
Total commercial real estate | Construction, land & land development | Doubtful
Financing Receivable [Line Items]
Loans Receivable	0	0
Total commercial real estate | Other commercial real estate
Financing Receivable [Line Items]
Loans Receivable	186,556	218,660
Total commercial real estate | Other commercial real estate | Pass
Financing Receivable [Line Items]
Loans Receivable	145,202	214,916
Total commercial real estate | Other commercial real estate | Watch
Financing Receivable [Line Items]
Loans Receivable	39,078	1,341
Total commercial real estate | Other commercial real estate | OAEM
Financing Receivable [Line Items]
Loans Receivable	1,752	1,825
Total commercial real estate | Other commercial real estate | Substandard
Financing Receivable [Line Items]
Loans Receivable	524	578
Total commercial real estate | Other commercial real estate | Doubtful
Financing Receivable [Line Items]
Loans Receivable	0	0
Residential real estate
Financing Receivable [Line Items]
Loans Receivable	61,141	96,529
Residential real estate | Pass
Financing Receivable [Line Items]
Loans Receivable	58,406	92,119
Residential real estate | Watch
Financing Receivable [Line Items]
Loans Receivable	1,297	2,216
Residential real estate | OAEM
Financing Receivable [Line Items]
Loans Receivable	153	791
Residential real estate | Substandard
Financing Receivable [Line Items]
Loans Receivable	1,212	1,369
Residential real estate | Doubtful
Financing Receivable [Line Items]
Loans Receivable	73	34
Owner-occupied real estate
Financing Receivable [Line Items]
Loans Receivable	73,466	118,294
Owner-occupied real estate | Pass
Financing Receivable [Line Items]
Loans Receivable	65,546	110,034
Owner-occupied real estate | Watch
Financing Receivable [Line Items]
Loans Receivable	4,627	3,227
Owner-occupied real estate | OAEM
Financing Receivable [Line Items]
Loans Receivable	0	1,280
Owner-occupied real estate | Substandard
Financing Receivable [Line Items]
Loans Receivable	3,293	3,753
Owner-occupied real estate | Doubtful
Financing Receivable [Line Items]
Loans Receivable	0	0
Commercial, financial & agricultural
Financing Receivable [Line Items]
Loans Receivable	390,097	529,184
Commercial, financial & agricultural | Pass
Financing Receivable [Line Items]
Loans Receivable	258,546	452,822
Commercial, financial & agricultural | Watch
Financing Receivable [Line Items]
Loans Receivable	63,524	59,306
Commercial, financial & agricultural | OAEM
Financing Receivable [Line Items]
Loans Receivable	29,475	5,223
Commercial, financial & agricultural | Substandard
Financing Receivable [Line Items]
Loans Receivable	38,552	11,833
Commercial, financial & agricultural | Doubtful
Financing Receivable [Line Items]
Loans Receivable	0	0
Consumer
Financing Receivable [Line Items]
Loans Receivable	1,197	2,161
Consumer | Pass
Financing Receivable [Line Items]
Loans Receivable	1,144	2,091
Consumer | Watch
Financing Receivable [Line Items]
Loans Receivable	6	3
Consumer | OAEM
Financing Receivable [Line Items]
Loans Receivable	0	0
Consumer | Substandard
Financing Receivable [Line Items]
Loans Receivable	29	37
Consumer | Doubtful
Financing Receivable [Line Items]
Loans Receivable	$ 18	$ 30

Allowance for Loan and Lease_12

Allowance for Loan and Lease Losses (ALLL) - Credit Quality of Purchased Credit Impaired Loans (Details) - Purchased Credit Impaired Loans - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	$ 124,750	$ 175,614
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	56,917	100,928
Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	24,990	24,361
OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	9,486	6,086
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	33,291	44,126
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	66	113
Total commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	67,191	100,293
Total commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	34,704	69,887
Total commercial real estate | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	16,212	12,807
Total commercial real estate | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	2,169	3,334
Total commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	14,106	14,265
Total commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Total commercial real estate | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	6,281	13,545
Total commercial real estate | Construction, land & land development | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	869	6,677
Total commercial real estate | Construction, land & land development | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	581	809
Total commercial real estate | Construction, land & land development | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	908	973
Total commercial real estate | Construction, land & land development | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	3,923	5,086
Total commercial real estate | Construction, land & land development | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Total commercial real estate | Other commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	60,910	86,748
Total commercial real estate | Other commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	33,835	63,210
Total commercial real estate | Other commercial real estate | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	15,631	11,998
Total commercial real estate | Other commercial real estate | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,261	2,361
Total commercial real estate | Other commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	10,183	9,179
Total commercial real estate | Other commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	30,037	40,332
Residential real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	15,133	21,706
Residential real estate | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	5,747	6,419
Residential real estate | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	553	1,590
Residential real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	8,538	10,504
Residential real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	66	113
Owner-occupied real estate
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	17,145	20,803
Owner-occupied real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	7,045	7,181
Owner-occupied real estate | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	2,897	4,896
Owner-occupied real estate | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	1,716	818
Owner-occupied real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	5,487	7,908
Owner-occupied real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Commercial, financial & agricultural
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	10,300	14,051
Commercial, financial & agricultural | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	6	2,094
Commercial, financial & agricultural | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	110	211
Commercial, financial & agricultural | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	5,030	323
Commercial, financial & agricultural | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	5,154	11,423
Commercial, financial & agricultural | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	0	0
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	77	135
Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	29	60
Consumer | Watch
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	24	28
Consumer | OAEM
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	18	21
Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	6	26
Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans Receivable	$ 0	$ 0

Allowance for Loan and Lease_13

Allowance for Loan and Lease Losses (ALLL) - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)contractcommitment	Sep. 30, 2017contract	Sep. 30, 2018USD ($)commitment	Sep. 30, 2017loan	Dec. 31, 2017USD ($)commitment
Receivables [Abstract]
Troubled debt restructuring	$ 6,400,000		$ 6,400,000		$ 1,500,000
Allowance for loan losses on troubled debt restructuring	$ 24,000		$ 24,000		$ 0
Number of commitments to extend credit to borrowers with TDR | commitment	1		1		0
Recorded investment for commitments to extend credit to borrowers with TDR	$ 7,000		$ 7,000
Number of TDR's that subsequently defaulted within 12 months	0	0		1
Recorded investment for TDR's that subsequently defaulted within 12 months			$ 823,000

Allowance for Loan and Lease_14

Allowance for Loan and Lease Losses (ALLL) - Troubled Debt Restructuring (Details) - Organic Loans $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)contract	Sep. 30, 2017USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	3	0
Pre-Modification Outstanding Recorded Investment	$ 5,570	$ 0
Post-Modification Outstanding Recorded Investment	$ 5,570	$ 0
Total commercial real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	2	0
Pre-Modification Outstanding Recorded Investment	$ 2,801	$ 0
Post-Modification Outstanding Recorded Investment	$ 2,801	$ 0
Total commercial real estate | Construction, land & land development
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0
Total commercial real estate | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	2	0
Pre-Modification Outstanding Recorded Investment	$ 2,801	$ 0
Post-Modification Outstanding Recorded Investment	$ 2,801	$ 0
Commercial & industrial
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0
Owner-occupied real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0
Residential real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1	0
Pre-Modification Outstanding Recorded Investment	$ 2,769	$ 0
Post-Modification Outstanding Recorded Investment	$ 2,769	$ 0
Consumer
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0

SBA Servicing Rights - Narrati

SBA Servicing Rights - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Transfers and Servicing [Abstract]
SBA loans sold, unpaid principal balance	$ 15,200	$ 10,100	$ 33,600	$ 35,100
SBA loans sold, gains on sales	1,300	1,200	3,200	3,600
SBA servicing fee income	454	$ 389	1,400	$ 1,200
SBA loans serviced	$ 195,900		$ 195,900		$ 185,600

SBA Servicing Rights - Rollfor

SBA Servicing Rights - Rollforward (Details) - SBA Loans - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period	$ 3,989	$ 3,828	$ 4,069	$ 3,477
Additions	325	253	738	850
Fair value adjustments	(472)	(131)	(965)	(377)
Balance, end of period	$ 3,842	$ 3,950	$ 3,842	$ 3,950

SBA Servicing Rights - Fair Va

SBA Servicing Rights - Fair Value Assumptions & Sensitivity Analysis (Details) - SBA Loans - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Servicing Assets at Fair Value [Line Items]
Fair value	$ 3,842	$ 4,069	$ 3,989	$ 3,950	$ 3,828	$ 3,477
Weighted average discount rate	13.40%	12.90%
Decline in fair value due to a 100 basis point adverse change	$ (119)	$ (140)
Decline in fair value due to a 200 basis point adverse change	$ (232)	$ (272)
Prepayment speed	11.90%	9.10%
Decline in fair value due to a 10% adverse change	$ (162)	$ (141)
Decline in fair value due to a 20% adverse change	$ (313)	$ (275)
Weighted average remaining life	5 years 5 months 24 days	6 years 8 months

SBA Servicing Rights - Past Du

SBA Servicing Rights - Past Due (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Servicing Assets at Fair Value [Line Items]
Total SBA loans serviced	$ 373,272		$ 349,787
Net Charge-offs during the period	104	$ 454
Serviced for others
Servicing Assets at Fair Value [Line Items]
Total SBA loans serviced	195,926		185,557
Net Charge-offs during the period	0	0
Held-for-sale
Servicing Assets at Fair Value [Line Items]
Total SBA loans serviced	17,382		10,420
Net Charge-offs during the period	0	0
Held-for-investment
Servicing Assets at Fair Value [Line Items]
Total SBA loans serviced	159,964		153,810
Net Charge-offs during the period	104	$ 454
30 - 89 Days Past Due
Servicing Assets at Fair Value [Line Items]
Total SBA loans serviced	4,209		4,063
30 - 89 Days Past Due | Serviced for others
Servicing Assets at Fair Value [Line Items]
Total SBA loans serviced	72		1,555
30 - 89 Days Past Due | Held-for-sale
Servicing Assets at Fair Value [Line Items]
Total SBA loans serviced	0		0
30 - 89 Days Past Due | Held-for-investment
Servicing Assets at Fair Value [Line Items]
Total SBA loans serviced	4,137		2,508
90 Days or Greater Past Due
Servicing Assets at Fair Value [Line Items]
Total SBA loans serviced	4,968		6,627
90 Days or Greater Past Due | Serviced for others
Servicing Assets at Fair Value [Line Items]
Total SBA loans serviced	0		0
90 Days or Greater Past Due | Held-for-sale
Servicing Assets at Fair Value [Line Items]
Total SBA loans serviced	0		0
90 Days or Greater Past Due | Held-for-investment
Servicing Assets at Fair Value [Line Items]
Total SBA loans serviced	$ 4,968		$ 6,627

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Narrative (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2018USD ($)derivative	Sep. 30, 2017USD ($)	Mar. 31, 2013USD ($)	Sep. 30, 2018USD ($)derivative	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)derivative
Derivative [Line Items]
Amount of gain (loss) recognized in income	$ (314,000)	$ (213,000)		$ (378,000)	$ (622,000)
Credit Risk Contract
Derivative [Line Items]
Fair value of derivatives in net liability position	0			0
Interest rate swaps and caps
Derivative [Line Items]
Notional amount	0			0		$ 36,300,000
Derivative financial instruments, assets	4,656,000			4,656,000		2,011,000
Derivative financial instruments, liabilities	0			0		116,000
Forward Commitments
Derivative [Line Items]
Notional amount	$ 0			$ 0		$ 55,800,000
Derivatives designated as hedging instruments | Interest Rate Swaps
Derivative [Line Items]
Number of interest rate derivatives held | derivative	67			67		84
Notional amount	$ 115,400,000			$ 115,400,000		$ 141,900,000
Derivatives designated as hedging instruments | Interest Rate Caps
Derivative [Line Items]
Notional amount			$ 200,000,000
Term of contract			5 years
Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative [Line Items]
Number of interest rate derivatives held | derivative	0			0
Noninterest Income | Interest Rate Swaps
Derivative [Line Items]
Amount of gain (loss) recognized in income	$ 0	(68,000)		$ 0	(124,000)
Noninterest Income | Interest rate swaps and caps
Derivative [Line Items]
Amount of gain (loss) recognized in income	(849,000)	(79,000)		(307,000)	250,000
Noninterest Income | Forward Commitments
Derivative [Line Items]
Amount of gain (loss) recognized in income	535,000	$ (66,000)		(71,000)	$ (748,000)
Other Assets | Derivatives designated as hedging instruments
Derivative [Line Items]
Derivative financial instruments, assets	4,656,000			4,656,000		2,011,000
Other Assets | Derivatives designated as hedging instruments | Interest rate swaps and caps
Derivative [Line Items]
Derivative financial instruments, assets	4,656,000			4,656,000		2,011,000
Other Assets | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative financial instruments, assets	0			0		616,000
Other Assets | Not Designated as Hedging Instrument | Mortgage Derivatives
Derivative [Line Items]
Derivative financial instruments, assets	0			0		616,000
Other Liabilities | Derivatives designated as hedging instruments
Derivative [Line Items]
Derivative financial instruments, liabilities	0			0		116,000
Other Liabilities | Derivatives designated as hedging instruments | Interest rate swaps and caps
Derivative [Line Items]
Derivative financial instruments, liabilities	0			0		116,000
Other Liabilities | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative financial instruments, liabilities	0			0		238,000
Other Liabilities | Not Designated as Hedging Instrument | Mortgage Derivatives
Derivative [Line Items]
Derivative financial instruments, liabilities	$ 0			$ 0		$ 238,000

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Balance Sheet Disclosures (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Derivatives designated as hedging instruments | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 4,656,000	$ 2,011,000
Derivatives designated as hedging instruments | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	0	116,000
Not Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	616,000
Not Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	0	238,000
Interest rate swaps and caps
Derivatives, Fair Value [Line Items]
Derivative Assets	4,656,000	2,011,000
Derivatives Liabilities	0	116,000
Interest rate swaps and caps | Derivatives designated as hedging instruments | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	4,656,000	2,011,000
Interest rate swaps and caps | Derivatives designated as hedging instruments | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	0	116,000
Mortgage derivatives | Not Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	616,000
Mortgage derivatives | Not Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	$ 0	$ 238,000

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Gain (Loss) on Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income	$ 66,624	$ 47,702	$ 190,873	$ 144,746
Interest Expense	8,039	3,370	21,302	9,978
Noninterest Income	9,738	9,682	31,116	29,617
Interest Rate Swaps | Interest Income | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedging relationships in Subtopic 815-20 - Hedged items	(457)	0	(2,773)	0
Gain (loss) on fair value hedging relationships in Subtopic 815-20	434	0	2,961	0
Interest Rate Swaps | Interest Expense | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedging relationships in Subtopic 815-20 - Hedged items	0	0	0	0
Gain (loss) on fair value hedging relationships in Subtopic 815-20	0	0	0	0
Interest Rate Swaps | Noninterest Income | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedging relationships in Subtopic 815-20 - Hedged items	0	(55)	0	(138)
Gain (loss) on fair value hedging relationships in Subtopic 815-20	0	3	0	35
Interest Rate Caps | Interest Income | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on cash flow hedging relationships in Subtopic 815-20	0	0	0	0
Interest Rate Caps | Interest Expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on cash flow hedging relationships in Subtopic 815-20	0	379	91	1,213
Interest Rate Caps | Noninterest Income | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on cash flow hedging relationships in Subtopic 815-20	$ 0	$ 0	$ 0	$ 0

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Fair Value Hedges (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Carrying Amount of the Hedged Asset	$ 108,206	$ 139,391
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Asset	(4,528)	(1,892)
Loans
Derivatives, Fair Value [Line Items]
Carrying Amount of the Hedged Asset	108,206	139,391
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Asset	$ (4,528)	$ (1,892)

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities - Cash Flow Hedges (Details) - Interest Rate Caps - Cash Flow Hedging - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivatives designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in AOCI on derivatives (effective portion)	$ 0	$ (409)	$ (95)	$ (1,163)
OCI | Derivatives designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in AOCI on derivatives (effective portion)	0	(30)	(4)	50
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss reclassified from AOCI into income	0	(379)	(91)	(1,213)
Interest Expense | Derivatives designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss reclassified from AOCI into income	$ 0	$ 379	$ 91	$ 1,213

Derivative Instruments and He_8

Derivative Instruments and Hedging Activities - Interest Rate Products Not Designated as Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative [Line Items]
Amount of gain (loss) recognized in income	$ (314)	$ (213)	$ (378)	$ (622)
Noninterest Income | Interest Rate Swaps
Derivative [Line Items]
Amount of gain (loss) recognized in income	0	(68)	0	(124)
Noninterest Income | Interest Rate Lock Commitments
Derivative [Line Items]
Amount of gain (loss) recognized in income	(849)	(79)	(307)	250
Noninterest Income | Forward Commitments
Derivative [Line Items]
Amount of gain (loss) recognized in income	$ 535	$ (66)	$ (71)	$ (748)

Balance Sheet Offsetting and _3

Balance Sheet Offsetting and Repurchase Agreements - Offsetting Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Repurchase agreements
Gross Amounts Recognized	$ 33,621	$ 25,209
Gross Amounts Offset on the Statement of Financial Condition	0	0
Net Amounts Presented on the Statement of Financial Condition	33,621	25,209
Gross Amounts Not Offset on the Statement of Financial Condition	0	0
Collateral Received/Posted	(33,621)	(25,209)
Net Amount	0	0
Total liabilities
Gross Amounts Recognized	33,621	25,325
Gross Amounts Offset on the Statement of Financial Condition	0	0
Net Amounts Presented on the Statement of Financial Condition	33,621	25,325
Gross Amounts Not Offset on the Statement of Financial Condition	0	(116)
Collateral Received/Posted	(33,621)	(25,209)
Net Amount	0	0
Interest rate swaps and caps
Offsetting Assets
Gross Amounts Recognized	4,656	2,011
Gross Amounts Offset on the Statement of Financial Condition	0	0
Net Amounts Presented on the Statement of Financial Condition	4,656	2,011
Financial Instruments	0	(116)
Collateral Received/Posted	(4,502)	(1,895)
Net Amount	154	0
Offsetting Liabilities
Gross Amounts Recognized	0	116
Gross Amounts Offset on the Statement of Financial Condition	0	0
Net Amounts Presented on the Statement of Financial Condition	0	116
Financial Instruments	0	(116)
Collateral Received/Posted	0	0
Net Amount	$ 0	$ 0

Balance Sheet Offsetting and _4

Balance Sheet Offsetting and Repurchase Agreements - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Offsetting [Abstract]
Securities sold under repurchase agreements	$ 33,621	$ 25,209

Regulatory Matters - Minimum R

Regulatory Matters - Minimum Required Regulatory Ratios (Details)	Sep. 30, 2018
Common Equity Tier 1 (CET1) capital ratio
Minimum Requirement	4.50%
Well-capitalized	6.50%
Tier 1 risk-based capital ratio
Minimum Requirement	6.00%
Well-capitalized	8.00%
Total risk-based capital ratio
Minimum Requirement	8.00%
Well-capitalized	10.00%
Tier 1 leverage ratio
Minimum Requirement	4.00%
Well-capitalized	5.00%

Regulatory Matters - Regulator

Regulatory Matters - Regulatory Ratios Consolidated (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Common Equity Tier 1 (CET1) capital ratio
Actual Amount	$ 579,770	$ 547,822
Actual Ratio	12.89%	12.61%
Required Minimum Amount	$ 202,409	$ 195,433
Tier 1 risk-based capital ratio
Actual Amount	$ 579,770	$ 547,822
Actual Ratio	12.89%	12.61%
Required Minimum Amount	$ 269,878	$ 260,578
Total risk-based capital ratio
Actual Amount	$ 614,559	$ 576,572
Actual Ratio	13.66%	13.28%
Required Minimum Amount	$ 359,838	$ 347,437
Tier 1 leverage ratio
Actual Amount	$ 579,770	$ 547,822
Actual Ratio	11.85%	11.24%
Required Minimum Amount	$ 195,697	$ 194,924

Regulatory Matters - Regulat_2

Regulatory Matters - Regulatory Ratios Subsidiaries (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Common Equity Tier 1 (CET1) capital ratio
Actual Amount	$ 579,770	$ 547,822
Actual Ratio	12.89%	12.61%
Required Minimum Amount	$ 202,409	$ 195,433
Tier 1 risk-based capital ratio
Actual Amount	$ 579,770	$ 547,822
Actual Ratio	12.89%	12.61%
Required Minimum Amount	$ 269,878	$ 260,578
Total risk-based capital ratio
Actual Amount	$ 614,559	$ 576,572
Actual Ratio	13.66%	13.28%
Required Minimum Amount	$ 359,838	$ 347,437
Tier 1 leverage ratio
Actual Amount	$ 579,770	$ 547,822
Actual Ratio	11.85%	11.24%
Required Minimum Amount	$ 195,697	$ 194,924
State Bank
Common Equity Tier 1 (CET1) capital ratio
Actual Amount	$ 515,147	$ 481,135
Actual Ratio	11.45%	11.10%
Required Minimum Amount	$ 202,547	$ 194,972
Required Well Capitalized Amount	292,567	281,626
Tier 1 risk-based capital ratio
Actual Amount	$ 515,147	$ 481,135
Actual Ratio	11.45%	11.10%
Required Minimum Amount	$ 270,062	$ 259,962
Required Well Capitalized Amount	360,083	346,617
Total risk-based capital ratio
Actual Amount	$ 549,936	$ 509,885
Actual Ratio	12.22%	11.77%
Required Minimum Amount	$ 360,083	$ 346,617
Required Well Capitalized Amount	450,104	433,271
Tier 1 leverage ratio
Actual Amount	$ 515,147	$ 481,135
Actual Ratio	10.54%	9.90%
Required Minimum Amount	$ 195,430	$ 194,429
Required Well Capitalized Amount	$ 244,288	$ 243,037

Regulatory Matters - Narrative

Regulatory Matters - Narrative (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017	[1]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash and amounts due from depository institutions	$ 16,273,000	$ 17,438,000
State Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capacity to pay dividends without prior regulatory approval	0
State Bank Financial Corporation
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash and amounts due from depository institutions	$ 65,100,000
[1]	Derived from audited financial statements

Commitments and Contingent Li_3

Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Commitments [Line Items]
Commitments	$ 1,078,840	$ 997,047
Minimum
Commitments [Line Items]
Fixed rate loan commitments maturity (term)	1 month
Maximum
Commitments [Line Items]
Fixed rate loan commitments maturity (term)	12 years
Fixed | Commitments to extend credit
Commitments [Line Items]
Commitments	$ 99,290	65,117
Fixed | Letters of credit
Commitments [Line Items]
Commitments	5,628	5,978
Variable | Commitments to extend credit
Commitments [Line Items]
Commitments	966,924	914,524
Variable | Letters of credit
Commitments [Line Items]
Commitments	6,998	$ 11,428
Obligation to repurchase or indemnify loans sold
Commitments [Line Items]
Recourse liability	$ 280

Fair Value - Narrative (Detail

Fair Value - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of mortgages held-for-sale	$ 13,300		$ 13,300
Impaired loans, recorded investments	76,960		76,960		$ 14,984
Impaired loans, valuation allowances	2,068		2,068		1,238
Mortgage loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contractual balance including accrued interest	13,000		13,000
Gain (loss) on change in fair value			292
Mortgage banking income | Mortgage loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on change in fair value	(869)	$ 63	(252)	$ 545
Collateral Dependent | Assets measured on a nonrecurring basis | Organic and Purchased Non-Credit Impaired Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, recorded investments	74,000		74,000		13,000
Impaired loans, valuation allowances	$ 2,100		$ 2,100		$ 1,200

Fair Value - Assets and Liabil

Fair Value - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets:
Fair value of mortgages held-for-sale	$ 13,300
Measured on recurring basis
Assets:
Fair value of mortgages held-for-sale	13,294	$ 25,791
SBA servicing rights	3,842	4,069
Total recurring assets at fair value	903,882	1,045,848
Liabilities:
Total recurring liabilities at fair value		354
Measured on recurring basis | Equity securities - financial services industry
Assets:
Investment securities available-for-sale	1,515	1,515
Measured on recurring basis | U.S. Government securities
Assets:
Investment securities available-for-sale	66,698	69,559
Measured on recurring basis | Residential mortgage-backed securities — nonagency
Assets:
Investment securities available-for-sale	82,707	118,710
Measured on recurring basis | Residential mortgage-backed securities — agency
Assets:
Investment securities available-for-sale	507,786	575,849
Measured on recurring basis | Corporate securities
Assets:
Investment securities available-for-sale	115,178	108,337
Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1)
Assets:
Fair value of mortgages held-for-sale	0	0
SBA servicing rights	0	0
Total recurring assets at fair value	0	0
Liabilities:
Total recurring liabilities at fair value		0
Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1) | Equity securities - financial services industry
Assets:
Investment securities available-for-sale	0	0
Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1) | U.S. Government securities
Assets:
Investment securities available-for-sale	0	0
Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1) | Residential mortgage-backed securities — nonagency
Assets:
Investment securities available-for-sale	0	0
Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1) | Residential mortgage-backed securities — agency
Assets:
Investment securities available-for-sale	0	0
Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1) | Corporate securities
Assets:
Investment securities available-for-sale	0	0
Measured on recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Fair value of mortgages held-for-sale	13,294	25,791
SBA servicing rights	0	0
Total recurring assets at fair value	900,040	1,041,264
Liabilities:
Total recurring liabilities at fair value		154
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | Equity securities - financial services industry
Assets:
Investment securities available-for-sale	1,515	1,515
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government securities
Assets:
Investment securities available-for-sale	66,698	69,559
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities — nonagency
Assets:
Investment securities available-for-sale	82,707	118,710
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities — agency
Assets:
Investment securities available-for-sale	507,786	575,849
Measured on recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities
Assets:
Investment securities available-for-sale	115,178	108,337
Measured on recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Fair value of mortgages held-for-sale	0	0
SBA servicing rights	3,842	4,069
Total recurring assets at fair value	3,842	4,584
Liabilities:
Total recurring liabilities at fair value		200
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | Equity securities - financial services industry
Assets:
Investment securities available-for-sale	0	0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | U.S. Government securities
Assets:
Investment securities available-for-sale	0	0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities — nonagency
Assets:
Investment securities available-for-sale	0	0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities — agency
Assets:
Investment securities available-for-sale	0	0
Measured on recurring basis | Significant Unobservable Inputs (Level 3) | Corporate securities
Assets:
Investment securities available-for-sale	0	0
Hedged loans | Measured on recurring basis
Assets:
Derivative assets	108,206	139,391
Hedged loans | Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1)
Assets:
Derivative assets	0	0
Hedged loans | Measured on recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Derivative assets	108,206	139,391
Hedged loans | Measured on recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Derivative assets	0	0
Mortgage Derivatives | Measured on recurring basis
Assets:
Derivative assets		616
Liabilities:
Derivatives liabilities		238
Mortgage Derivatives | Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1)
Assets:
Derivative assets		0
Liabilities:
Derivatives liabilities		0
Mortgage Derivatives | Measured on recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Derivative assets		101
Liabilities:
Derivatives liabilities		38
Mortgage Derivatives | Measured on recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Derivative assets		515
Liabilities:
Derivatives liabilities		200
Interest rate swaps and caps | Measured on recurring basis
Assets:
Derivative assets	4,656	2,011
Liabilities:
Derivatives liabilities		116
Interest rate swaps and caps | Measured on recurring basis | Quoted Market Prices in Active Markets (Level 1)
Assets:
Derivative assets	0	0
Liabilities:
Derivatives liabilities		0
Interest rate swaps and caps | Measured on recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Derivative assets	4,656	2,011
Liabilities:
Derivatives liabilities		116
Interest rate swaps and caps | Measured on recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Derivative assets	$ 0	0
Liabilities:
Derivatives liabilities		$ 0

Fair Value - Mortgage Derivati

Fair Value - Mortgage Derivatives Reconciliation (Details) - Mortgage Derivatives - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Assets
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	$ 961	$ 890	$ 515	$ 699
Issuances	0	339	1,031	1,543
Settlements and closed loans	(961)	(492)	(1,546)	(1,505)
Balance, end of period	0	737	0	737
Other Liabilities
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	435	385	200	445
Issuances	0	339	740	1,167
Settlements and closed loans	(435)	(385)	(940)	(1,273)
Balance, end of period	0	339	0	339
Mortgage banking income
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Gain (loss) on change in fair value	$ (526)	$ (107)	$ (315)	$ 144

Fair Value - Financial Assets

Fair Value - Financial Assets Measured on a Nonrecurring Basis (Details) - Organic and Purchased Non-Credit Impaired Loans - Assets measured on a nonrecurring basis - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 71,959	$ 11,804
Total nonrecurring assets at fair value	71,959	11,804
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
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
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	71,959	11,804
Total nonrecurring assets at fair value	$ 71,959	$ 11,804

Fair Value - Nonfinancial Asse

Fair Value - Nonfinancial Assets Measured on a Nonrecurring Basis (Details) - Assets measured on a nonrecurring basis - Other real estate owned - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 5,949	$ 1,204
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	$ 5,949	$ 1,204

Fair Value - Reconciliation of

Fair Value - Reconciliation of Other Real Estate Owned (Details) - Other real estate owned - Assets measured on a nonrecurring basis - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned at fair value	$ 5,949	$ 1,204
Estimated selling costs and other adjustments	(507)	(309)
Other real estate owned	$ 5,442	$ 895

Fair Value - Unobservable Inpu

Fair Value - Unobservable Inputs (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
SBA servicing rights | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	9.00%	10.00%
Prepayment speed	6.00%	4.00%
SBA servicing rights | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	27.00%	22.00%
Prepayment speed	15.00%	13.00%
SBA servicing rights | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	13.00%	13.00%
Prepayment speed	12.00%	9.00%
Mortgage derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pull-through rate		84.00%
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	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	50.00%	33.00%
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	3.00%	12.00%
Measured on recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
SBA servicing rights	$ 3,842	$ 4,069
Mortgage derivatives - asset	903,882	1,045,848
Measured on recurring basis | SBA servicing rights | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
SBA servicing rights	3,842	4,069
Measured on recurring basis | Mortgage derivatives | Pricing model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage derivatives - asset		515
Measured on a nonrecurring basis | Other real estate owned | Third party appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 5,949	$ 1,204
Impaired loans - collateral dependent | 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	0.00%	0.00%
Impaired loans - collateral dependent | 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	100.00%	50.00%
Impaired loans - collateral dependent | 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	3.00%	9.00%
Impaired loans - collateral dependent | 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	$ 71,959	$ 11,804
Mortgage derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pull-through rate		84.00%
Mortgage derivatives | Measured on recurring basis | Pricing model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage derivatives - liability		$ 200

Fair Value - Estimated Fair Va

Fair Value - Estimated Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets:
Investment securities available-for-sale	$ 772,369	$ 872,455	[1]
Investment securities held-to-maturity	13,035	33,351
Loans held-for-sale	13,300
Carrying Amount | Level 1
Assets:
Cash and cash equivalents	207,927	230,877
Carrying Amount | Level 2
Assets:
Equity securities	1,515	1,515
Investment securities available-for-sale	772,369	872,455
Loans held-for-sale	30,676	36,211
Derivative financial instruments	4,656	2,011
Accrued interest receivable	16,790	14,906
Liabilities:
Deposits	4,186,914	4,243,135
Federal funds purchased and securities sold under agreements to repurchase	33,621	25,209
Notes payable	0	398
Interest rate swaps and caps	0	116
Accrued interest payable	4,856	3,750
Carrying Amount | Level 2 & 3
Assets:
Investment securities held-to-maturity	13,000	32,852
Loans, net	3,602,545	3,503,443
Derivative financial instruments	0	616
Liabilities:
Interest rate swaps and caps	0	238
Carrying Amount | Level 3
Assets:
Other real estate owned	5,442	895
SBA servicing rights	3,842	4,069
Federal Home Loan Bank stock	4,452	4,651
Estimated Fair Value | Level 1
Assets:
Cash and cash equivalents	207,927	230,877
Estimated Fair Value | Level 2
Assets:
Equity securities	1,515	1,515
Investment securities available-for-sale	772,369	872,455
Loans held-for-sale	32,160	37,580
Derivative financial instruments	4,656	2,011
Accrued interest receivable	16,790	14,906
Liabilities:
Deposits	4,185,897	4,237,883
Federal funds purchased and securities sold under agreements to repurchase	33,621	25,209
Notes payable	0	398
Interest rate swaps and caps	0	116
Accrued interest payable	4,856	3,750
Estimated Fair Value | Level 2 & 3
Assets:
Investment securities held-to-maturity	13,035	33,351
Loans, net	3,624,999	3,513,057
Derivative financial instruments	0	616
Liabilities:
Interest rate swaps and caps	0	238
Estimated Fair Value | Level 3
Assets:
Other real estate owned	5,949	1,204
SBA servicing rights	3,842	4,069
Federal Home Loan Bank stock	$ 4,452	$ 4,651
[1]	Derived from audited financial statements

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Anti-dilutive securities excluded from computation of earnings per share (in shares)	0	0	0	0
Numerator:
Net income per consolidated statements of income	$ 17,955	$ 14,436	$ 54,087	$ 41,197
Net income allocated to participating securities	(400)	(389)	(1,342)	(1,095)
Net income allocated to common stock	17,555	14,047	52,745	40,102
Basic earnings per share computation:
Net income allocated to common stock	$ 17,555	$ 14,047	$ 52,745	$ 40,102
Weighted average common shares outstanding, including shares considered participating securities (in shares)	39,064,072	38,969,619	39,057,314	38,928,833
Less: Average participating securities (in shares)	(870,973)	(1,050,866)	(968,936)	(1,034,448)
Weighted average shares (in shares)	38,193,099	37,918,753	38,088,378	37,894,385
Basic earnings per share (usd per share)	$ 0.46	$ 0.37	$ 1.38	$ 1.06
Diluted earnings per share computation:
Net income allocated to common stock	$ 17,555	$ 14,047	$ 52,745	$ 40,102
Weighted average shares (in shares)	38,193,099	37,918,753	38,088,378	37,894,385
Weighted average dilutive grants (in shares)	18,377	44,388	22,560	49,586
Weighted average shares and dilutive potential common shares (in shares)	38,211,476	37,963,141	38,110,938	37,943,971
Diluted earnings per share (usd per share)	$ 0.46	$ 0.37	$ 1.38	$ 1.06

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income - Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
Balance, beginning of period			$ 641,551	[1]	$ 613,633
Other comprehensive income (loss) before income taxes:
Net change in unrealized gains (losses)	$ (3,232)	$ 1,604	(12,296)		2,198
Amounts reclassified for net (gains) losses realized and included in earnings	(181)	376	(340)		1,185
Transfer of unrealized gain from held-to-maturity to available-for-sale	0	0	(51)		0
Amortization of net unrealized losses on securities transferred to held-to-maturity	7	(4)	30		40
Adoption of ASU 2016-01						$ 23
Income tax benefit	(863)	760	(2,860)		1,309
Balance, end of period	664,177	642,590	664,177		642,590
Debt Securities Available-for-Sale
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
Balance, beginning of period	(9,791)	(905)	(2,523)		(1,200)
Other comprehensive income (loss) before income taxes:
Net change in unrealized gains (losses)	(3,232)	1,634	(12,292)		2,148
Amounts reclassified for net (gains) losses realized and included in earnings	(181)	(3)	(431)		(28)
Transfer of unrealized gain from held-to-maturity to available-for-sale	0		0
Amortization of net unrealized losses on securities transferred to held-to-maturity	0	0	0		0
Adoption of ASU 2016-01						23
Income tax benefit	(863)	625	(2,882)		819
Balance, end of period	(12,341)	101	(12,341)		101
Held-to-Maturity Securities Transferred from Available-For-Sale
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
Balance, beginning of period	(7)	(131)	21		(175)
Other comprehensive income (loss) before income taxes:
Net change in unrealized gains (losses)	0	0	0		0
Amounts reclassified for net (gains) losses realized and included in earnings	0	0	0		0
Transfer of unrealized gain from held-to-maturity to available-for-sale	0		(51)
Amortization of net unrealized losses on securities transferred to held-to-maturity	7	(4)	30		40
Adoption of ASU 2016-01						0
Income tax benefit	0	0	0		0
Balance, end of period	0	(135)	0		(135)
Cash Flow Hedges (Effective Portion)
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
Balance, beginning of period	0	(523)	(65)		(1,082)
Other comprehensive income (loss) before income taxes:
Net change in unrealized gains (losses)	0	(30)	(4)		50
Amounts reclassified for net (gains) losses realized and included in earnings	0	379	91		1,213
Transfer of unrealized gain from held-to-maturity to available-for-sale	0		0
Amortization of net unrealized losses on securities transferred to held-to-maturity	0	0	0		0
Adoption of ASU 2016-01						0
Income tax benefit	0	135	22		490
Balance, end of period	0	(309)	0		(309)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]
Balance, beginning of period	(9,798)	(1,559)	(2,567)		(2,457)
Other comprehensive income (loss) before income taxes:
Adoption of ASU 2016-01						$ 23
Balance, end of period	$ (12,341)	$ (343)	$ (12,341)		$ (343)
[1]	Derived from audited financial statements

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income - Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense on deposits	$ (8,039)	$ (3,370)	$ (21,302)	$ (9,978)
Income tax (expense) benefit	(1,841)	(7,592)	(13,221)	(21,793)
Debt securities available-for-sale | Reclassifications from AOCI into income and affected line items on Consolidated Statements of Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of investment securities	181	3	431	28
Income tax (expense) benefit	(46)	(1)	(109)	(11)
Net income	135	2	322	17
Cash flow hedges (effective portion) | Reclassifications from AOCI into income and affected line items on Consolidated Statements of Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense on deposits	0	(379)	(91)	(1,213)
Income tax (expense) benefit	0	145	23	466
Net income	$ 0	$ (234)	$ (68)	$ (747)