Enterprise Financial Services (EFSC) 10-Q 27 Jul 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 25, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	ENTERPRISE FINANCIAL SERVICES CORP
Entity Central Index Key	1,025,835
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		23,150,738

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 91,851	$ 91,084
Federal funds sold	1,445	1,223
Interest-bearing deposits (including $1,295 and $1,365 pledged as collateral, respectively)	83,961	61,016
Total cash and cash equivalents	177,257	153,323
Interest-bearing deposits greater than 90 days	2,180	2,645
Securities available for sale	651,140	641,382
Securities held to maturity	68,931	73,749
Loans held for sale	1,388	3,155
Loans	4,275,761	4,097,050
Less: Allowance for loan losses	44,370	42,577
Total loans, net	4,231,391	4,054,473
Other real estate	454	498
Other investments, at cost	36,132	26,661
Fixed assets, net	32,814	32,618
Accrued interest receivable	17,808	14,069
State tax credits held for sale (including $299 and $400 carried at fair value, respectively)	46,481	43,468
Goodwill	117,345	117,345
Intangible assets, net	9,768	11,056
Other assets	116,835	114,783
Total assets	5,509,924	5,289,225
Liabilities and Shareholders' Equity
Demand deposits	1,050,969	1,123,907
Interest-bearing transaction accounts	754,819	915,653
Money market accounts	1,558,923	1,342,931
Savings	209,870	195,150
Certificates of deposit:
Brokered	224,192	115,306
Other	449,139	463,467
Total deposits	4,247,912	4,156,414
Subordinated debentures and notes (net of debt issuance cost of $1,071 and $1,136, respectively)	118,131	118,105
Federal Home Loan Bank advances	361,534	172,743
Other borrowings	167,216	253,674
Accrued interest payable	1,884	1,730
Other liabilities	39,163	37,986
Total liabilities	4,935,840	4,740,652
Shareholders' equity:
Preferred stock, $0.01 par value; 5,000,000 shares authorized; 0 shares issued and outstanding	0	0
Common stock, $0.01 par value; 30,000,000 shares authorized; 23,900,669 and 23,781,112 shares issued, respectively	239	238
Treasury stock, at cost; 756,588 and 691,673 shares, respectively	(26,326)	(23,268)
Additional paid in capital	348,471	350,061
Retained earnings	264,280	225,360
Accumulated other comprehensive loss	(12,580)	(3,818)
Total shareholders' equity	574,084	548,573
Total liabilities and shareholders' equity	$ 5,509,924	$ 5,289,225

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Assets
Collateral pledged	$ 1,295	$ 1,365
State tax credits held for sale	299	400
Payments of Debt Issuance Costs	$ 1,071	$ 1,136
Shareholders' equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	23,900,669	23,781,112
Treasury stock, shares	756,588	691,673

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income:
Interest and fees on loans	$ 52,948	$ 47,307	$ 103,398	$ 87,233
Interest on debt securities:
Taxable	4,228	3,585	8,215	6,815
Nontaxable	271	304	553	690
Interest on interest-bearing deposits	231	234	471	364
Dividends on equity securities	201	112	406	180
Total interest income	57,879	51,542	113,043	95,282
Interest expense:
Interest-bearing transaction accounts	817	523	1,623	1,198
Money market accounts	4,445	1,938	7,798	3,431
Savings accounts	147	125	272	207
Certificates of deposit	2,338	1,373	4,237	2,588
Subordinated debentures and notes	1,454	1,288	2,822	2,452
Federal Home Loan Bank advances	1,448	522	2,706	852
Notes payable and other borrowings	182	140	366	279
Total interest expense	10,831	5,909	19,824	11,007
Net interest income	47,048	45,633	93,219	84,275
Provision for portfolio loan losses	2,385	3,623	4,256	5,156
Provision reversal for purchased credit impaired loan losses	(1,995)	(207)	(1,995)	(355)
Net interest income after provision for loan losses	46,658	42,217	90,958	79,474
Noninterest income:
Service charges on deposit accounts	3,007	2,816	5,858	5,326
Wealth management revenue	2,141	2,054	4,255	3,887
Fees and Commissions, Credit and Debit Cards	1,650	1,392	3,166	2,429
Gain on state tax credits, net	64	9	316	255
Gain on sale of other real estate	0	17	0	17
Gain on sale of investment securities	0	0	9	0
Miscellaneous income	2,831	1,646	5,631	2,996
Total noninterest income	9,693	7,934	19,235	14,910
Noninterest expense:
Employee compensation and benefits	16,582	15,798	33,073	31,006
Occupancy	2,342	2,265	4,748	4,194
Data processing	1,533	1,806	3,000	3,439
Professional fees	747	1,079	1,596	1,916
FDIC and other insurance	920	650	1,837	1,474
Loan legal and other real estate expense	(23)	613	276	958
Merger related expenses	0	4,480	0	6,147
Other	7,118	5,960	13,832	10,253
Total noninterest expense	29,219	32,651	58,362	59,387
Income before income tax expense	27,132	17,500	51,831	34,997
Income tax expense	4,881	5,545	8,659	10,651
Net income	$ 22,251	$ 11,955	$ 43,172	$ 24,346
Earnings per common share
Basic (usd per share)	$ 0.96	$ 0.51	$ 1.87	$ 1.07
Diluted (usd per share)	$ 0.95	$ 0.50	$ 1.85	$ 1.06

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 22,251	$ 11,955	$ 43,172	$ 24,346
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on investment securities arising during the period, net of income tax expense (benefit) for three months of $(333) and $921, and for six months of $($2,598) and $1,268, respectively	(1,017)	1,502	(7,921)	2,070
Less: Reclassification adjustment for realized gains on sale of securities available for sale included in net income, net of income tax expense for the six months of $2 and $0, respectively	0	0	(7)	0
Total other comprehensive income (loss)	(1,017)	1,502	(7,928)	2,070
Total comprehensive income	$ 21,234	$ 13,457	$ 35,244	$ 26,416

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other comprehensive income, tax:
Unrealized (loss)/gain on investment securities available for sale arising during the period, tax	$ (1,017)	$ 1,502	$ (7,921)	$ 2,070
Reclassification adjustment for realized gains on sale of securities available for sale included in net income, tax	$ 0	$ 0	$ (7)	$ 0

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Balance at Dec. 31, 2016	$ 387,098	$ 203	$ (6,632)	$ 213,078	$ 182,190	$ (1,741)
Net income	24,346	0	0	0	24,346	0
Other comprehensive income	2,070	0	0	0	0	2,070
Total comprehensive income	26,416	0	0	0	24,346	2,070
Cash dividends paid on common shares	5,163	0	0	0	5,163	0
Issuance under equity compensation plans, net	(2,903)	1	0	(2,904)	0	0
Share-based Compensation	1,576	0	0	1,576	0	0
Shares issued in connection with acquisition	141,729	33	0	141,696	0	0
Reclassification for the adoption of new accounting standards	0	0	0	(5,229)	5,229	0
Balance at Jun. 30, 2017	548,753	237	(6,632)	348,217	206,602	329
Balance at Dec. 31, 2017	548,573	238	(23,268)	350,061	225,360	(3,818)
Net income	43,172	0	0	0	43,172	0
Other comprehensive income	(7,928)	0	0	0	0	(7,928)
Total comprehensive income	35,244	0	0	0	43,172	(7,928)
Cash dividends paid on common shares	5,086	0	0	0	5,086	0
Repurchase of common stock	3,058	0	3,058	0	0	0
Issuance under equity compensation plans, net	(3,220)	1	0	(3,221)	0	0
Share-based Compensation	1,631	0	0	1,631	0	0
Reclassification for the adoption of new accounting standards	0	0	0	0	834	(834)
Balance at Jun. 30, 2018	$ 574,084	$ 239	$ (26,326)	$ 348,471	$ 264,280	$ (12,580)

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash dividends paid on common shares, per share	$ 0.22	$ 0.22
Issuance under equity compensation plans, shares	119,557	140,531

Condensed Consolidated Stateme9

Condensed Consolidated Statements of Cash Flows $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)
Cash flows from operating activities:
Net income	$ 43,172	$ 24,346
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	1,707	1,583
Provision for loan losses	2,261	4,800
Deferred income taxes	3,156	4,166
Net amortization of debt securities	956	1,708
Amortization of intangible assets	1,288	1,207
Gain on sale of investment securities	(9)	0
Mortgage loans originated for sale	(25,064)	(80,697)
Proceeds from mortgage loans sold	27,070	86,127
Gain on sale of other real estate	0	(17)
Gain on state tax credits, net	(316)	(255)
Share-based Compensation	1,631	1,576
Net accretion of loan discount	(793)	(3,001)
Changes in:
Accrued interest receivable	(3,739)	1,988
Accrued interest payable	154	(299)
Other assets	(809)	483
Other liabilities	1,203	(51,359)
Net cash provided by (used in) operating activities	51,868	(7,644)
Cash flows from investing activities:
Proceeds from Previous Acquisition	0	4,456
Net increase in loans	(178,386)	(65,592)
Proceeds from the sale of securities, available for sale	1,451	143,554
Proceeds from the paydown or maturity of securities, available for sale	40,743	107,603
Proceeds from the paydown or maturity of securities, held to maturity	3,239	2,722
Proceeds from the redemption of other investments	22,728	23,390
Proceeds from the sale of state tax credits held for sale	1,940	4,286
Proceeds from the sale of other real estate	0	2,513
Payments for the purchase/origination of:
Available for sale debt securities	(62,055)	(263,453)
Other investments	(33,719)	(30,977)
State tax credits held for sale	(4,636)	0
Fixed assets, net	(1,915)	(1,140)
Net cash used in investing activities	(210,610)	(72,638)
Cash flows from financing activities:
Net decrease in noninterest-bearing deposit accounts	(72,938)	(8,162)
Net increase (decrease) in interest-bearing deposit accounts	164,436	(69,117)
Proceeds from Federal Home Loan Bank advances	907,500	1,141,181
Repayments of Federal Home Loan Bank advances	(718,500)	(940,681)
Net decrease in other borrowings	(86,458)	(115,911)
Cash dividends paid on common stock	(5,086)	(5,163)
Payments for Repurchase of Common Stock	3,058	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	(3,220)	(2,903)
Net cash provided by (used in) financing activities	182,676	(756)
Net increase (decrease) in cash and cash equivalents	23,934	(81,038)
Cash and cash equivalents, beginning of period	153,323	198,802
Cash and cash equivalents, end of period	177,257	117,764
Supplemental Cash Flow Information [Abstract]
Cash paid during the period for interest	19,670	10,653
Cash paid during the period for income taxes	780	6,386
Noncash transactions:
Transfer to other real estate owned in settlement of loans	$ 0	$ 289
Common shares issued related to acquisition	0	141,729

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES The significant accounting policies used by Enterprise Financial Services Corp (the "Company" or "Enterprise") in the preparation of the condensed consolidated financial statements are summarized below: Business and Consolidation Enterprise is a financial holding company that provides a full range of banking and wealth management services to individuals and corporate customers located in the St. Louis, Kansas City, and Phoenix metropolitan markets through its banking subsidiary, Enterprise Bank & Trust (the "Bank"). Operating results for the three and six months ended June 30, 2018 are not necessarily indicative of the results that may be expected for any other interim period or for the year ending December 31, 2018 . For further information, refer to the consolidated financial statements and footnotes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017 . Basis of Financial Statement Presentation The condensed consolidated financial statements of the Company and its subsidiaries have been prepared in accordance with the accounting principles generally accepted in the United States of America ("U.S. GAAP") for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. The condensed consolidated financial statements include the accounts of the Company and its subsidiaries, all of which are wholly owned. All intercompany accounts and transactions have been eliminated. During the first quarter of 2018, the Company adopted Accounting Standards Update ("ASU") 2016-01, "Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities." ASU 2016-01 requires equity investments to be measured at fair value through earnings, and eliminates the available-for-sale classification for equity securities with readily determinable fair values. The guidance also provides an alternative to measure equity securities without readily determinable fair values at cost less impairment (if any), plus or minus observable price changes from an identical or similar investment of the same issuer (the “measurement alternative”). The Company elected the measurement alternative for its qualifying equity securities. The adoption of this update resulted in an insignificant increase to retained earnings which was reclassified from accumulated other comprehensive income. In addition, the Company early adopted ASU 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities" during the first quarter of 2018. The objective of ASU 2017-12 is to improve the financial reporting of hedging relationships by better aligning an entity's risk management activity with the economic objectives in undertaking those activities. The adoption of this update had an insignificant impact on the Company's consolidated financial statements. The Company also early adopted ASU 2018-02, "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" during the first quarter of 2018. The ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. The adoption of this update resulted in an increase to retained earnings of $0.8 million which was reclassified from accumulated other comprehensive income. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Revenue The Company adopted the accounting standard regarding revenue recognition in the first quarter of 2018 using the modified retrospective approach. The Company's revenues are primarily composed of interest income on financial instruments, including investment securities, which are excluded from the scope of the new guidance. Certain other noninterest income from loans, investment securities and derivative financial instruments is also excluded from this guidance. Service charges on deposit accounts, wealth management revenue, card services revenue, and gain on sale of other real estate are within the scope of the guidance; however, there were no accounting policy changes as the Company's policies were consistent with the new guidance. Other noninterest income sources of revenue are considered immaterial. Implementation of this guidance did not change current business practices or have any changes to the Company's consolidated financial statements. Descriptions of our revenue-generating activities within the scope of this guidance, which are presented in our income statement as components of noninterest income are as follows: • Service charges on deposit accounts - represents fees generated from a variety of deposit products and services provided to customers under a day-to-day contract. These fees are recognized on a daily or monthly basis. • Wealth management revenue - represents monthly fees earned from directing, holding, and managing customers’ assets. Revenue is recognized over regular intervals, either monthly or quarterly. • Card services revenue - represents revenue earned from merchant, debit and credit cards as incurred and includes a contra revenue account for rebates. • Gain on sale of other real estate - represents income recognized at delivery of control of a property at the time of a real estate closing. Income Taxes The SEC staff issued SAB 118, which provides guidance on accounting for the tax effects of the Tax Cuts and Jobs Act of 2017 (“Tax Act”). SAB 118 provides a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete the accounting under ASC 740. In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Act for which the accounting under ASC 740 is complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act is incomplete but it is able to determine a reasonable estimate, it must record a provisional estimate in the financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply ASC 740 on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act. The Company has recorded amounts based on the information known and reasonable estimates used as of June 30, 2018, but are subject to change based on a number of factors. The Company will complete its analysis of certain tax positions at the time it files its tax returns for the year ended December 31, 2017 and will be able to conclude if any further adjustments to the provisional estimate of the impact recorded is required.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE Basic earnings per common share data is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Common shares outstanding include common stock and restricted stock awards where recipients have satisfied the vesting terms. Diluted earnings per common share gives effect to all dilutive potential common shares outstanding during the period using the treasury stock method. The following table presents a summary of per common share data and amounts for the periods indicated. Three months ended June 30, Six months ended June 30, (in thousands, except per share data) 2018 2017 2018 2017 Net income as reported $ 22,251 $ 11,955 $ 43,172 $ 24,346 Weighted average common shares outstanding 23,124 23,475 23,119 22,706 Additional dilutive common stock equivalents 194 257 213 314 Weighted average diluted common shares outstanding 23,318 23,732 23,332 23,020 Basic earnings per common share: $ 0.96 $ 0.51 $ 1.87 $ 1.07 Diluted earnings per common share: $ 0.95 $ 0.50 $ 1.85 $ 1.06 For the three and six months ended June 30, 2018 and 2017 , there were no common stock equivalents excluded from the earnings per share calculations because their effect would have been anti-dilutive.

Investments

Investments	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Investments	INVESTMENTS The following table presents the amortized cost, gross unrealized gains and losses and fair value of securities available for sale and held to maturity: June 30, 2018 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 99,902 $ — $ (1,858 ) $ 98,044 Obligations of states and political subdivisions 31,750 348 (154 ) 31,944 Agency mortgage-backed securities 525,810 369 (14,890 ) 511,289 U.S. Treasury bills 9,957 — (94 ) 9,863 Total securities available for sale $ 667,419 $ 717 $ (16,996 ) $ 651,140 Held to maturity securities: Obligations of states and political subdivisions $ 12,537 $ 7 $ (240 ) $ 12,304 Agency mortgage-backed securities 56,394 — (1,789 ) 54,605 Total securities held to maturity $ 68,931 $ 7 $ (2,029 ) $ 66,909 December 31, 2017 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 99,878 $ 6 $ (660 ) $ 99,224 Obligations of states and political subdivisions 34,181 674 (213 ) 34,642 Agency mortgage-backed securities 513,082 727 (6,293 ) 507,516 Total securities available for sale $ 647,141 $ 1,407 $ (7,166 ) $ 641,382 Held to maturity securities: Obligations of states and political subdivisions $ 14,031 $ 69 $ (46 ) $ 14,054 Agency mortgage-backed securities 59,718 16 (330 ) 59,404 Total securities held to maturity $ 73,749 $ 85 $ (376 ) $ 73,458 At June 30, 2018 , and December 31, 2017 , there were no holdings of securities of any one issuer in an amount greater than 10% of shareholders’ equity, other than U.S. Government agencies and sponsored enterprises. The agency mortgage-backed securities are all issued by U.S. Government agencies and sponsored enterprises. Securities having a fair value of $376.0 million and $500.0 million at June 30, 2018 , and December 31, 2017 , respectively, were pledged as collateral to secure deposits of public institutions and for other purposes as required by law or contract provisions. The amortized cost and estimated fair value of debt securities at June 30, 2018 , by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately 5 years. Available for sale Held to maturity (in thousands) Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 2,675 $ 2,690 $ — $ — Due after one year through five years 121,187 119,369 867 866 Due after five years through ten years 12,703 12,804 10,804 10,603 Due after ten years 5,044 4,988 866 835 Agency mortgage-backed securities 525,810 511,289 56,394 54,605 $ 667,419 $ 651,140 $ 68,931 $ 66,909 The following table represents a summary of investment securities that had an unrealized loss: June 30, 2018 Less than 12 months 12 months or more Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Obligations of U.S. Government-sponsored enterprises $ 98,044 $ 1,858 $ — $ — $ 98,044 $ 1,858 Obligations of states and political subdivisions 24,883 369 364 25 25,247 394 Agency mortgage-backed securities 392,242 10,617 134,128 6,062 526,370 16,679 U.S. Treasury bills 9,863 94 — — 9,863 94 $ 525,032 $ 12,938 $ 134,492 $ 6,087 $ 659,524 $ 19,025 December 31, 2017 Less than 12 months 12 months or more Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Obligations of U.S. Government-sponsored enterprises $ 89,309 $ 660 $ — $ — $ 89,309 $ 660 Obligations of states and political subdivisions 13,951 259 — — 13,951 259 Agency mortgage-backed securities 469,655 6,034 12,229 589 481,884 6,623 $ 572,915 $ 6,953 $ 12,229 $ 589 $ 585,144 $ 7,542 The unrealized losses at both June 30, 2018 , and December 31, 2017 , were primarily attributable to changes in market interest rates since the securities were purchased. Management systematically evaluates investment securities for other-than-temporary declines in fair value on a quarterly basis. This analysis requires management to consider various factors, which include among other considerations (1) the present value of the cash flows expected to be collected compared to the amortized cost of the security, (2) duration and magnitude of the decline in value, (3) the financial condition of the issuer or issuers, (4) structure of the security, and (5) the intent to sell the security or whether it is more likely than not the Company would be required to sell the security before its anticipated recovery in market value. At June 30, 2018 , management performed its quarterly analysis of all securities with an unrealized loss and concluded no individual securities were other-than-temporarily impaired.

Loans

Loans	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Portfolio Loans	LOANS The loan portfolio is comprised of loans originated by the Company and loans that were acquired in connection with the Company’s acquisitions. These loans are accounted for using the guidance in the Accounting Standards Codification (ASC) section 310-30 and 310-20. Loans accounted for using ASC 310-30 are sometimes referred to as purchased credit impaired ("PCI") loans. The table below shows the loan portfolio composition including carrying value categorized by loans accounted for at amortized cost, which includes our originated loans, and by loans accounted for as PCI. (in thousands) June 30, 2018 December 31, 2017 Loans accounted for at amortized cost $ 4,214,996 $ 4,022,896 Loans accounted for as PCI 60,765 74,154 Total loans $ 4,275,761 $ 4,097,050 The following tables refer to loans not accounted for as PCI loans. Below is a summary of loans by category at June 30, 2018 and December 31, 2017 : (in thousands) June 30, 2018 December 31, 2017 Commercial and industrial $ 2,038,040 $ 1,918,720 Real estate: Commercial - investor owned 819,427 769,275 Commercial - owner occupied 593,138 554,589 Construction and land development 300,117 303,091 Residential 318,055 341,312 Total real estate loans 2,030,737 1,968,267 Consumer and other 147,304 137,234 Loans, before unearned loan fees 4,216,081 4,024,221 Unearned loan fees, net (1,085 ) (1,325 ) Loans, including unearned loan fees $ 4,214,996 $ 4,022,896 A summary of the activity in the allowance for loan losses and the recorded investment in loans by class and category based on impairment methodology through June 30, 2018 , and at December 31, 2017 , is as follows: (in thousands) Commercial and industrial CRE - investor owned CRE - owner occupied Construction and land development Residential real estate Consumer and other Total Allowance for loan losses: Balance at December 31, 2017 $ 26,406 $ 3,890 $ 3,308 $ 1,487 $ 2,237 $ 838 $ 38,166 Provision (provision reversal) for loan losses 780 648 190 35 259 (41 ) 1,871 Losses charged off (732 ) — — — (254 ) (49 ) (1,035 ) Recoveries 956 8 4 206 73 14 1,261 Balance at March 31, 2018 $ 27,410 $ 4,546 $ 3,502 $ 1,728 $ 2,315 $ 762 $ 40,263 Provision (provision reversal) for loan losses 2,852 5 340 (206 ) (573 ) (33 ) 2,385 Losses charged off (956 ) — — — (38 ) (33 ) (1,027 ) Recoveries 118 10 3 168 59 28 386 Balance at June 30, 2018 $ 29,424 $ 4,561 $ 3,845 $ 1,690 $ 1,763 $ 724 — $ 42,007 (in thousands) Commercial and industrial CRE - investor owned CRE - owner occupied Construction and land development Residential real estate Consumer and other Total Balance June 30, 2018 Allowance for loan losses - Ending balance: Individually evaluated for impairment $ 3,667 $ — $ 219 $ — $ — $ — $ 3,886 Collectively evaluated for impairment 25,757 4,561 3,626 1,690 1,763 724 38,121 Total $ 29,424 $ 4,561 $ 3,845 $ 1,690 $ 1,763 $ 724 $ 42,007 Loans - Ending balance: Individually evaluated for impairment $ 11,226 $ 410 $ 2,150 $ 435 $ 1,669 $ 318 $ 16,208 Collectively evaluated for impairment 2,026,814 819,017 590,988 299,682 316,386 145,901 4,198,788 Total $ 2,038,040 $ 819,427 $ 593,138 $ 300,117 $ 318,055 $ 146,219 $ 4,214,996 Balance December 31, 2017 Allowance for loan losses - Ending balance: Individually evaluated for impairment $ 2,508 $ — $ 71 $ — $ — $ — $ 2,579 Collectively evaluated for impairment 23,898 3,890 3,237 1,487 2,237 838 35,587 Total $ 26,406 $ 3,890 $ 3,308 $ 1,487 $ 2,237 $ 838 $ 38,166 Loans - Ending balance: Individually evaluated for impairment $ 12,665 $ 422 $ 1,975 $ 136 $ 1,602 $ 375 $ 17,175 Collectively evaluated for impairment 1,906,055 768,853 552,614 302,955 339,710 135,534 4,005,721 Total $ 1,918,720 $ 769,275 $ 554,589 $ 303,091 $ 341,312 $ 135,909 $ 4,022,896 A summary of nonperforming loans individually evaluated for impairment by category at June 30, 2018 and December 31, 2017 , and the income recognized on impaired loans is as follows: June 30, 2018 (in thousands) Unpaid Recorded Recorded Allowance Total Related Allowance Average Commercial and industrial $ 20,915 $ 1,900 $ 9,326 $ 11,226 $ 3,667 $ 12,591 Real estate: Commercial - investor owned 557 410 — 410 — 415 Commercial - owner occupied 751 259 484 743 219 750 Construction and land development 444 435 — 435 — 494 Residential 1,835 1,669 — 1,669 — 1,688 Consumer and other 332 318 — 318 — 333 Total $ 24,834 $ 4,991 $ 9,810 $ 14,801 $ 3,886 $ 16,271 December 31, 2017 (in thousands) Unpaid Recorded Recorded Allowance Total Related Allowance Average Commercial and industrial $ 20,750 $ 2,321 $ 10,344 $ 12,665 $ 2,508 $ 16,270 Real estate: Commercial - investor owned 560 422 — 422 — 521 Commercial - owner occupied 487 — 487 487 71 490 Construction and land development 441 136 — 136 — 331 Residential 1,730 1,602 — 1,602 — 1,735 Consumer and other 375 375 — 375 — 375 Total $ 24,343 $ 4,856 $ 10,831 $ 15,687 $ 2,579 $ 19,722 Three months ended June 30, Six months ended June 30, (in thousands) 2018 2017 2018 2017 Total interest income that would have been recognized under original terms $ 467 $ 340 $ 1,001 $ 655 Total cash received and recognized as interest income on non-accrual loans 78 16 89 39 Total interest income recognized on accruing, impaired loans 13 14 23 47 The recorded investment in nonperforming loans by category at June 30, 2018 and December 31, 2017 , is as follows: June 30, 2018 (in thousands) Non-accrual Restructured, not on non-accrual Total Commercial and industrial $ 10,593 $ 633 $ 11,226 Real estate: Commercial - investor owned 410 — 410 Commercial - owner occupied 743 — 743 Construction and land development 435 — 435 Residential 1,669 — 1,669 Consumer and other 318 — 318 Total $ 14,168 $ 633 $ 14,801 December 31, 2017 (in thousands) Non-accrual Restructured, not on non-accrual Total Commercial and industrial $ 11,946 $ 719 $ 12,665 Real estate: Commercial - investor owned 422 — 422 Commercial - owner occupied 487 — 487 Construction and land development 136 — 136 Residential 1,602 — 1,602 Consumer and other 375 — 375 Total $ 14,968 $ 719 $ 15,687 At June 30, 2018, performing loans over 90 days past due and still accruing interest totaled $4.1 million . There were no loans over 90 days past due and still accruing interest at December 31, 2017 . There were no portfolio loans restructured during the three and six months ended June 30, 2018 and 2017. As of June 30, 2018 , the Company had $2.0 million in specific reserves allocated to $7.9 million of loans that have been restructured. During the three and six months ended June 30, 2018 and 2017, there were no portfolio loans that subsequently defaulted. The aging of the recorded investment in past due loans by portfolio class and category at June 30, 2018 and December 31, 2017 is shown below. June 30, 2018 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ 2,180 $ 8,070 $ 10,250 $ 2,027,790 $ 2,038,040 Real estate: Commercial - investor owned 1,141 — 1,141 818,286 819,427 Commercial - owner occupied 958 484 1,442 591,696 593,138 Construction and land development — — — 300,117 300,117 Residential 895 1,031 1,926 316,129 318,055 Consumer and other — — — 146,219 146,219 Total $ 5,174 $ 9,585 $ 14,759 $ 4,200,237 $ 4,214,996 December 31, 2017 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ 7,882 $ 1,770 $ 9,652 $ 1,909,068 $ 1,918,720 Real estate: Commercial - investor owned 934 — 934 768,341 769,275 Commercial - owner occupied — — — 554,589 554,589 Construction and land development 76 — 76 303,015 303,091 Residential 1,529 945 2,474 338,838 341,312 Consumer and other 407 — 407 135,502 135,909 Total $ 10,828 $ 2,715 $ 13,543 $ 4,009,353 $ 4,022,896 The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt, such as current financial information, payment experience, credit documentation, and current economic factors among other factors. This analysis is performed on a quarterly basis. The Company uses the following definitions for risk ratings: • Grades 1 , 2 , and 3 – Includes loans to borrowers with a continuous record of strong earnings, sound balance sheet condition and capitalization, ample liquidity with solid cash flow, and whose management team has experience and depth within their industry. • Grade 4 – Includes loans to borrowers with positive trends in profitability, satisfactory capitalization and balance sheet condition, and sufficient liquidity and cash flow. • Grade 5 – Includes loans to borrowers that may display fluctuating trends in sales, profitability, capitalization, liquidity, and cash flow. • Grade 6 – Includes loans to borrowers where an adverse change or perceived weakness has occurred, but may be correctable in the near future. Alternatively, this rating category may also include circumstances where the borrower is starting to reverse a negative trend or condition, or has recently been upgraded from a 7 , 8 , or 9 rating. • Grade 7 – Watch credits are borrowers that have experienced financial setback of a nature that is not determined to be severe or influence ‘ongoing concern’ expectations. Although possible, no loss is anticipated, due to strong collateral and/or guarantor support. • Grade 8 – Substandard credits will include those borrowers characterized by significant losses and sustained downward trends in balance sheet condition, liquidity, and cash flow. Repayment reliance may have shifted to secondary sources. Collateral exposure may exist and additional reserves may be warranted. • Grade 9 – Doubtful credits include borrowers that may show deteriorating trends that are unlikely to be corrected. Collateral values may appear insufficient for full recovery, therefore requiring a partial charge-off, or debt renegotiation with the borrower. The borrower may have declared bankruptcy or bankruptcy is likely in the near term. All doubtful rated credits will be on non-accrual. The recorded investment by risk category of the loans by portfolio class and category at June 30, 2018 , which is based upon the most recent analysis performed, and December 31, 2017 is as follows: June 30, 2018 (in thousands) Pass (1-6) Watch (7) Substandard (8) Total Commercial and industrial $ 1,853,440 $ 128,087 $ 56,513 $ 2,038,040 Real estate: Commercial - investor owned 785,920 28,442 5,065 819,427 Commercial - owner occupied 537,740 49,926 5,472 593,138 Construction and land development 289,263 10,301 553 300,117 Residential 307,727 2,859 7,469 318,055 Consumer and other 145,289 612 318 146,219 Total $ 3,919,379 $ 220,227 $ 75,390 $ 4,214,996 December 31, 2017 (in thousands) Pass (1-6) Watch (7) Substandard (8) Total Commercial and industrial $ 1,769,102 $ 94,002 $ 55,616 $ 1,918,720 Real estate: Commercial - investor owned 754,010 10,840 4,425 769,275 Commercial - owner occupied 514,616 34,440 5,533 554,589 Construction and land development 292,766 9,983 342 303,091 Residential 329,742 3,648 7,922 341,312 Consumer and other 134,704 10 1,195 135,909 Total $ 3,794,940 $ 152,923 $ 75,033 $ 4,022,896

Purchased Credit Impaired ("PCI

Purchased Credit Impaired ("PCI") Loans	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Purchase Credit Impaired (PCI) Loans	Below is a summary of PCI loans by category at June 30, 2018 and December 31, 2017 : June 30, 2018 December 31, 2017 (in thousands) Weighted- Average Risk Rating 1 Recorded Investment PCI Loans Weighted- Average Risk Rating 1 Recorded Investment PCI Loans Commercial and industrial 6.47 $ 2,711 6.38 $ 3,212 Real estate: Commercial - investor owned 7.37 30,539 7.36 42,887 Commercial - owner occupied 7.02 13,269 6.48 11,332 Construction and land development 6.02 5,121 5.99 5,883 Residential 6.05 9,102 5.99 10,781 Consumer and other 5.20 23 2.84 59 Total $ 60,765 $ 74,154 1 Risk ratings are based on the borrower's contractual obligation, which is not reflective of the purchase discount. The aging of the recorded investment in past due PCI loans by portfolio class and category at June 30, 2018 and December 31, 2017 is shown below: June 30, 2018 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ — $ — $ — $ 2,711 $ 2,711 Real estate: Commercial - investor owned 685 — 685 29,854 30,539 Commercial - owner occupied 735 728 1,463 11,806 13,269 Construction and land development 149 — 149 4,972 5,121 Residential 37 275 312 8,790 9,102 Consumer and other 1 — 1 22 23 Total $ 1,607 $ 1,003 $ 2,610 $ 58,155 $ 60,765 December 31, 2017 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ — $ — $ — $ 3,212 $ 3,212 Real estate: Commercial - investor owned — 3,034 3,034 39,853 42,887 Commercial - owner occupied — 673 673 10,659 11,332 Construction and land development — — — 5,883 5,883 Residential 328 255 583 10,198 10,781 Consumer and other — — — 59 59 Total $ 328 $ 3,962 $ 4,290 $ 69,864 $ 74,154 The following table is a roll forward of PCI loans, net of the allowance for loan losses, for the six months ended June 30, 2018 and 2017 . (in thousands) Contractual Cashflows Non-accretable Difference Accretable Yield Carrying Amount Balance December 31, 2017 $ 112,710 $ 29,005 $ 13,964 $ 69,741 Principal reductions and interest payments (22,667 ) — — (22,667 ) Accretion of loan discount — — (3,400 ) 3,400 Changes in contractual and expected cash flows due to remeasurement 3,281 (8,771 ) 4,124 7,928 Balance June 30, 2018 $ 93,324 $ 20,234 $ 14,688 $ 58,402 Balance December 31, 2016 $ 66,003 $ 18,902 $ 13,176 $ 33,925 Acquisitions 68,763 14,296 5,312 49,155 Principal reductions and interest payments (10,781 ) — — (10,781 ) Accretion of loan discount — — (3,534 ) 3,534 Changes in contractual and expected cash flows due to remeasurement 5,641 (1,383 ) 1,328 5,696 Reductions due to disposals (5,070 ) (1,317 ) (1,398 ) (2,355 ) Balance June 30, 2017 $ 124,556 $ 30,498 $ 14,884 $ 79,174 The accretable yield is recognized in interest income over the estimated life of the acquired loans using the effective yield method. Outstanding customer balances on PCI loans were $81.1 million and $94.9 million as of June 30, 2018 , and December 31, 2017 , respectively.

Commitments

Commitments	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments	COMMITMENTS AND CONTINGENCIES The Company issues financial instruments with off balance sheet risk in the normal course of the business of meeting the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. These instruments may involve, to varying degrees, elements of credit and interest rate risk in excess of the amounts recognized in the consolidated balance sheets. The Company’s extent of involvement and maximum potential exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and standby letters of credit is represented by the contractual amount of these instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for financial instruments included on its consolidated balance sheets. At June 30, 2018 , the amount of unadvanced commitments on impaired loans was insignificant. The contractual amounts of off-balance-sheet financial instruments as of June 30, 2018 , and December 31, 2017 , are as follows: (in thousands) June 30, 2018 December 31, 2017 Commitments to extend credit $ 1,272,570 $ 1,298,423 Letters of credit 54,647 73,790 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments usually have fixed expiration dates or other termination clauses, may have significant usage restrictions, and may require payment of a fee. Of the total commitments to extend credit at June 30, 2018 , and December 31, 2017 , approximately $103.4 million and $112.0 million , respectively, represent fixed rate loan commitments. Since certain of the commitments may expire without being drawn upon or may be revoked, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s credit worthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the borrower. Collateral held varies, but may include accounts receivable, inventory, premises and equipment, and real estate. Other liabilities includes $0.4 million for estimated losses attributable to the unadvanced commitments at June 30, 2018 , and December 31, 2017 . Standby letters of credit are conditional commitments issued by the Company to guarantee the performance or payment of a customer to a third party. These standby letters of credit are issued to support contractual obligations of the Company’s customers. The credit risk involved in issuing letters of credit is essentially the same as the risk involved in extending loans to customers. As of June 30, 2018 , the approximate remaining terms of standby letters of credit range from 1 month to 3 years and 6 months . Contingencies The Company and its subsidiaries are, from time to time, parties to various legal proceedings arising out of their businesses. Management believes there are no such proceedings pending or threatened against the Company or its subsidiaries which, if determined adversely, would have a material adverse effect on the business, consolidated financial condition, results of operations or cash flows of the Company or any of its subsidiaries.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	DERIVATIVE FINANCIAL INSTRUMENTS The Company is a party to various derivative financial instruments that are used in the normal course of business to meet the needs of its clients and as part of its risk management activities. These instruments include interest rate swaps and option contracts and foreign exchange forward contracts. The Company does not enter into derivative financial instruments for trading purposes. Hedging Instruments. At June 30, 2018 , the Company has no outstanding derivative contracts used to manage risk. Client-Related Derivative Instruments. The Company enters into interest rate swaps to allow customers to hedge changes in fair value of certain loans while maintaining a variable rate loan on its own books. The Company also enters into foreign exchange forward contracts with clients, and enters into offsetting foreign exchange forward contracts with established financial institution counterparties. The table below summarizes the notional amounts and fair values of the client-related derivative instruments: Asset Derivatives (Other Assets) Liability Derivatives (Other Liabilities) Notional Amount Fair Value Fair Value (in thousands) June 30, December 31, June 30, December 31, June 30, December 31, Non-designated hedging instruments Interest rate swap contracts $ 404,643 $ 394,852 $ 4,016 $ 2,061 $ 4,016 $ 2,061 Foreign exchange forward contracts 1,342 1,528 1,342 1,528 1,342 1,528 Changes in the fair value of client-related derivative instruments are recognized currently in operations. For the three and six months ended June 30, 2018 and 2017 , the gains and losses offset each other due to the Company's hedging of the client swaps and foreign exchange contracts with other bank counterparties.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS Below is a description of certain assets and liabilities measured at fair value. The following table summarizes financial instruments measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017 , segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: June 30, 2018 (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fair Value Assets Securities available for sale Obligations of U.S. Government-sponsored enterprises $ — $ 98,044 $ — $ 98,044 Obligations of states and political subdivisions — 31,944 — 31,944 Residential mortgage-backed securities — 511,289 — 511,289 U.S. Treasury bills — 9,863 — 9,863 Total securities available for sale $ — $ 651,140 $ — $ 651,140 Other investments 179 — — 179 State tax credits held for sale — — 299 299 Derivative financial instruments — 5,358 — 5,358 Total assets $ 179 $ 656,498 $ 299 $ 656,976 Liabilities Derivative financial instruments $ — $ 5,358 $ — $ 5,358 Total liabilities $ — $ 5,358 $ — $ 5,358 December 31, 2017 (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fair Value Assets Securities available for sale Obligations of U.S. Government-sponsored enterprises $ — $ 99,224 $ — $ 99,224 Obligations of states and political subdivisions — 34,642 — 34,642 Residential mortgage-backed securities — 507,516 — 507,516 Total securities available for sale $ — $ 641,382 $ — $ 641,382 State tax credits held for sale — — 400 400 Derivative financial instruments — 3,589 — 3,589 Total assets $ — $ 644,971 $ 400 $ 645,371 Liabilities Derivative financial instruments $ — $ 3,589 $ — $ 3,589 Total liabilities $ — $ 3,589 $ — $ 3,589 • Securities available for sale . Securities classified as available for sale are reported at fair value utilizing Level 2 and Level 3 inputs. Fair values for Level 2 securities are based upon dealer quotes, market spreads, the U.S. Treasury yield curve, trade execution data, market consensus prepayment speeds, credit information and the bond's terms and conditions at the security level. • Other investments. At June 30, 2018 , of the $36.1 million of other investments on the condensed consolidated balance sheet, approximately $0.2 million were carried at fair value. The remaining $35.9 million of other investments were accounted for at cost. Other investments reported at fair value represent equity securities with quoted market prices (Level 1). • State tax credits held for sale. At June 30, 2018 , of the $46.5 million of state tax credits held for sale on the condensed consolidated balance sheet, approximately $0.3 million were carried at fair value. The remaining $46.2 million of state tax credits were accounted for at cost. The Company is not aware of an active market that exists for the 10 -year streams of state tax credit financial instruments. However, the Company’s principal market for these tax credits consists of Missouri state residents who buy these credits and local and regional accounting firms who broker them. As such, the Company employed a discounted cash flow analysis (income approach) to determine the fair value. The remaining state tax credits carried at fair value are expected to be sold within the next several quarters. The state tax credit assets are reported as Level 3 assets. • Derivatives . Derivatives are reported at fair value utilizing Level 2 inputs. The Company obtains counterparty quotations to value its interest rate swaps. In addition, the Company validates the counterparty quotations with third party valuation sources. Derivatives with negative fair values are included in Other liabilities in the consolidated balance sheets. Derivatives with positive fair value are included in Other assets in the consolidated balance sheets. There were no transfers between Level 1 and Level 2 during the three and six months ended June 30, 2018 and 2017. Level 3 financial instruments The following table presents the changes in Level 3 financial instruments measured at fair value on a recurring basis as of June 30, 2018 and 2017 . • Purchases, sales, issuances and settlements . There were no Level 3 purchases during the quarters ended June 30, 2018 or 2017 . • Transfers in and/or out of Level 3 . There were no Level 3 transfers during the quarter ended June 30, 2018 . There was $3.1 million in Level 3 transfers to Level 2 during the quarter ended June 30, 2017 . Securities available for sale, at fair value Three months ended June 30, Six months ended June 30, (in thousands) 2018 2017 2018 2017 Beginning balance $ — $ 3,093 $ — $ 3,089 Total gains: Included in other comprehensive income — — — 4 Purchases, sales, issuances and settlements: Purchases — — — — Transfer in and/or out of Level 3 — (3,093 ) — (3,093 ) Ending balance $ — $ — $ — $ — Change in unrealized gains relating to assets still held at the reporting date $ — $ — $ — $ — State tax credits held for sale Three months ended June 30, Six months ended June 30, (in thousands) 2018 2017 2018 2017 Beginning balance $ 350 $ 1,458 $ 400 $ 3,585 Total gains: Included in earnings 3 9 6 49 Purchases, sales, issuances and settlements: Sales (54 ) (193 ) (107 ) (2,360 ) Ending balance $ 299 $ 1,274 $ 299 $ 1,274 Change in unrealized gains (losses) relating to assets still held at the reporting date $ (13 ) $ (49 ) $ (26 ) $ (655 ) From time to time, the Company measures certain assets at fair value on a nonrecurring basis. These include assets that are measured at the lower of cost or fair value that were recognized at fair value below cost at the end of the period. The following table presents financial instruments and non-financial assets measured at fair value on a non-recurring basis as of June 30, 2018 . (1) (1) (1) (1) (in thousands) Total Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant (Level 3) Total losses for the three Total losses for the six Impaired loans $ 1,486 $ — $ — $ 1,486 $ 900 $ 1,609 Other real estate 454 — — 454 1 44 Total $ 1,940 $ — $ — $ 1,940 $ 901 $ 1,653 (1) The amounts represent only balances measured at fair value during the period and still held as of the reporting date. Impaired loans are reported at the fair value of the underlying collateral for collateral dependent loans. Fair values for impaired loans are obtained from current appraisals by qualified licensed appraisers or independent valuation specialists. At June 30, 2018, impaired loans measured on a non-recurring basis had a principal balance of $2.4 million , with a valuation allowance of $0.9 million . Other real estate owned is adjusted to fair value upon foreclosure of the underlying loan. Subsequently, foreclosed assets are carried at the lower of carrying value or fair value less costs to sell. Fair value of other real estate is based upon the current appraised values of the properties as determined by qualified licensed appraisers and the Company’s judgment of other relevant market conditions. Following is a summary of the carrying amounts and fair values of the Company’s financial instruments on the consolidated balance sheets at June 30, 2018 and December 31, 2017 . Fair values that are not estimable are listed at the carrying value. June 30, 2018 December 31, 2017 (in thousands) Carrying Amount Estimated fair value Carrying Amount Estimated fair value Balance sheet assets Cash and due from banks $ 91,851 $ 91,851 $ 91,084 $ 91,084 Federal funds sold 1,445 1,445 1,223 1,223 Interest-bearing deposits 86,141 86,141 63,661 63,661 Securities available for sale 651,140 651,140 641,382 641,382 Securities held to maturity 68,931 66,909 73,749 73,458 Other investments, at cost 36,132 36,132 26,661 26,661 Loans held for sale 1,388 1,388 3,155 3,155 Derivative financial instruments 5,358 5,358 3,589 3,589 Portfolio loans, net 4,231,391 4,252,679 4,054,473 4,096,741 State tax credits, held for sale 46,481 45,069 43,468 44,271 Accrued interest receivable 17,808 17,808 14,069 14,069 Balance sheet liabilities Deposits 4,247,912 4,242,061 4,156,414 4,153,323 Subordinated debentures and notes 118,131 105,889 118,105 105,031 Federal Home Loan Bank advances 361,534 361,531 172,743 172,893 Other borrowings 167,216 167,086 253,674 253,530 Derivative financial instruments 5,358 5,358 3,589 3,589 Accrued interest payable 1,884 1,884 1,730 1,730 For information regarding the methods and assumptions used to estimate the fair value of each class of financial instruments for which it is practical to estimate such value, refer to Note 18 – Fair Value Measurements in the Company's Annual Report on Form 10 -K for the year ended December 31, 2017 . The following table presents the level in the fair value hierarchy for the estimated fair values of only the Company’s financial instruments that are not already presented on the condensed consolidated balance sheets at fair value at June 30, 2018 , and December 31, 2017 . Estimated Fair Value Measurement at Reporting Date Using Balance at June 30, 2018 (in thousands) Level 1 Level 2 Level 3 Financial Assets: Securities held to maturity $ — $ 66,909 $ — $ 66,909 Portfolio loans, net — — 4,252,679 4,252,679 State tax credits, held for sale — — 44,770 44,770 Financial Liabilities: Deposits 3,574,581 — 667,480 4,242,061 Subordinated debentures and notes — 105,889 — 105,889 Federal Home Loan Bank advances — 361,531 — 361,531 Other borrowings — 167,086 — 167,086 Estimated Fair Value Measurement at Reporting Date Using Balance at December 31, 2017 (in thousands) Level 1 Level 2 Level 3 Financial Assets: Securities held to maturity $ — $ 73,458 $ — $ 73,458 Portfolio loans, net — — 4,096,741 4,096,741 State tax credits, held for sale — — 43,871 43,871 Financial Liabilities: Deposits 3,577,641 — 575,682 4,153,323 Subordinated debentures and notes — 105,031 — 105,031 Federal Home Loan Bank advances — 172,893 — 172,893 Other borrowings — 253,530 — 253,530

New Authoritative Accounting Gu

New Authoritative Accounting Guidance	6 Months Ended
	Jun. 30, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Authoritative Accounting Guidance	NEW AUTHORITATIVE ACCOUNTING GUIDANCE Financial Accounting Standards Board (the "FASB") ASU 2017-08 "Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities" In March 2017, the FASB issued ASU 2017-08, "Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20)" which shortens the amortization period of certain callable debt securities held at a premium to the earliest call date. The amendments are effective for public business entities for annual periods beginning after December 15, 2018, including interim periods within those annual periods, with early adoption being permitted. The Company has evaluated the new guidance and does not expect it to have a material impact on the Company's consolidated financial statements. At June 30, 2018, the book value of callable bonds that were purchased at a premium totaled $22.0 million, and the amount of unamortized premium remaining on these securities was $0.8 million. FASB ASU 2016-13 "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments" In June 2016, the FASB issued ASU 2016-13, "Financial Instruments (Topic 326)" which changes the methodology for evaluating impairment of most financial instruments. The ASU replaces the currently used incurred loss model with a forward-looking expected loss model, which will generally result in a more timely recognition of losses. The guidance becomes effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company has formed an implementation team that includes members of accounting, credit, and loan operations to review the requirements of ASU 2016-13, and has contracted with a software provider to aid in implementation. The Company has not determined the impact this standard may have on its financial statements. FASB ASU 2016-02 "Leases (Topic 842)" In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)" which requires organizations that lease assets ("lessees") to recognize the assets and liabilities for the rights and obligations created by leases with terms of more than 12 months. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee remains dependent on its classification as a finance or operating lease. The criteria for determining whether a lease is a finance or operating lease has not been significantly changed by this ASU. The ASU also requires additional disclosure of the amount, timing, and uncertainty of cash flows arising from leases, including qualitative and quantitative requirements. The guidance becomes effective for periods beginning after December 15, 2018, including interim periods therein. Early adoption will be permitted. The Company has formed a lease implementation team that includes members of accounting, facilities and operations to review lease contracts and the requirements of ASU 2016-02. The Company expects the adoption of this standard will increase total assets on the Company's consolidated balance sheet and utilize capital.

Summary of Significant Accoun19

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Business and Consolidation	Basis of Financial Statement Presentation The condensed consolidated financial statements of the Company and its subsidiaries have been prepared in accordance with the accounting principles generally accepted in the United States of America ("U.S. GAAP") for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. The condensed consolidated financial statements include the accounts of the Company and its subsidiaries, all of which are wholly owned. All intercompany accounts and transactions have been eliminated. During the first quarter of 2018, the Company adopted Accounting Standards Update ("ASU") 2016-01, "Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities." ASU 2016-01 requires equity investments to be measured at fair value through earnings, and eliminates the available-for-sale classification for equity securities with readily determinable fair values. The guidance also provides an alternative to measure equity securities without readily determinable fair values at cost less impairment (if any), plus or minus observable price changes from an identical or similar investment of the same issuer (the “measurement alternative”). The Company elected the measurement alternative for its qualifying equity securities. The adoption of this update resulted in an insignificant increase to retained earnings which was reclassified from accumulated other comprehensive income. In addition, the Company early adopted ASU 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities" during the first quarter of 2018. The objective of ASU 2017-12 is to improve the financial reporting of hedging relationships by better aligning an entity's risk management activity with the economic objectives in undertaking those activities. The adoption of this update had an insignificant impact on the Company's consolidated financial statements. The Company also early adopted ASU 2018-02, "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" during the first quarter of 2018. The ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. The adoption of this update resulted in an increase to retained earnings of $0.8 million which was reclassified from accumulated other comprehensive income. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Revenue The Company adopted the accounting standard regarding revenue recognition in the first quarter of 2018 using the modified retrospective approach. The Company's revenues are primarily composed of interest income on financial instruments, including investment securities, which are excluded from the scope of the new guidance. Certain other noninterest income from loans, investment securities and derivative financial instruments is also excluded from this guidance. Service charges on deposit accounts, wealth management revenue, card services revenue, and gain on sale of other real estate are within the scope of the guidance; however, there were no accounting policy changes as the Company's policies were consistent with the new guidance. Other noninterest income sources of revenue are considered immaterial. Implementation of this guidance did not change current business practices or have any changes to the Company's consolidated financial statements. Descriptions of our revenue-generating activities within the scope of this guidance, which are presented in our income statement as components of noninterest income are as follows: • Service charges on deposit accounts - represents fees generated from a variety of deposit products and services provided to customers under a day-to-day contract. These fees are recognized on a daily or monthly basis. • Wealth management revenue - represents monthly fees earned from directing, holding, and managing customers’ assets. Revenue is recognized over regular intervals, either monthly or quarterly. • Card services revenue - represents revenue earned from merchant, debit and credit cards as incurred and includes a contra revenue account for rebates. • Gain on sale of other real estate - represents income recognized at delivery of control of a property at the time of a real estate closing. Income Taxes The SEC staff issued SAB 118, which provides guidance on accounting for the tax effects of the Tax Cuts and Jobs Act of 2017 (“Tax Act”). SAB 118 provides a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete the accounting under ASC 740. In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Act for which the accounting under ASC 740 is complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act is incomplete but it is able to determine a reasonable estimate, it must record a provisional estimate in the financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply ASC 740 on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act. The Company has recorded amounts based on the information known and reasonable estimates used as of June 30, 2018, but are subject to change based on a number of factors. The Company will complete its analysis of certain tax positions at the time it files its tax returns for the year ended December 31, 2017 and will be able to conclude if any further adjustments to the provisional estimate of the impact recorded is required.
Available-for-sale Securities	Management systematically evaluates investment securities for other-than-temporary declines in fair value on a quarterly basis. This analysis requires management to consider various factors, which include among other considerations (1) the present value of the cash flows expected to be collected compared to the amortized cost of the security, (2) duration and magnitude of the decline in value, (3) the financial condition of the issuer or issuers, (4) structure of the security, and (5) the intent to sell the security or whether it is more likely than not the Company would be required to sell the security before its anticipated recovery in market value. At June 30, 2018 , management performed its quarterly analysis of all securities with an unrealized loss and concluded no individual securities were other-than-temporarily impaired.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Summary of Per Common Share Data and Amounts	The following table presents a summary of per common share data and amounts for the periods indicated. Three months ended June 30, Six months ended June 30, (in thousands, except per share data) 2018 2017 2018 2017 Net income as reported $ 22,251 $ 11,955 $ 43,172 $ 24,346 Weighted average common shares outstanding 23,124 23,475 23,119 22,706 Additional dilutive common stock equivalents 194 257 213 314 Weighted average diluted common shares outstanding 23,318 23,732 23,332 23,020 Basic earnings per common share: $ 0.96 $ 0.51 $ 1.87 $ 1.07 Diluted earnings per common share: $ 0.95 $ 0.50 $ 1.85 $ 1.06

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation	The following table presents the amortized cost, gross unrealized gains and losses and fair value of securities available for sale and held to maturity: June 30, 2018 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 99,902 $ — $ (1,858 ) $ 98,044 Obligations of states and political subdivisions 31,750 348 (154 ) 31,944 Agency mortgage-backed securities 525,810 369 (14,890 ) 511,289 U.S. Treasury bills 9,957 — (94 ) 9,863 Total securities available for sale $ 667,419 $ 717 $ (16,996 ) $ 651,140 Held to maturity securities: Obligations of states and political subdivisions $ 12,537 $ 7 $ (240 ) $ 12,304 Agency mortgage-backed securities 56,394 — (1,789 ) 54,605 Total securities held to maturity $ 68,931 $ 7 $ (2,029 ) $ 66,909 December 31, 2017 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 99,878 $ 6 $ (660 ) $ 99,224 Obligations of states and political subdivisions 34,181 674 (213 ) 34,642 Agency mortgage-backed securities 513,082 727 (6,293 ) 507,516 Total securities available for sale $ 647,141 $ 1,407 $ (7,166 ) $ 641,382 Held to maturity securities: Obligations of states and political subdivisions $ 14,031 $ 69 $ (46 ) $ 14,054 Agency mortgage-backed securities 59,718 16 (330 ) 59,404 Total securities held to maturity $ 73,749 $ 85 $ (376 ) $ 73,458
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation	The following table presents the amortized cost, gross unrealized gains and losses and fair value of securities available for sale and held to maturity: June 30, 2018 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 99,902 $ — $ (1,858 ) $ 98,044 Obligations of states and political subdivisions 31,750 348 (154 ) 31,944 Agency mortgage-backed securities 525,810 369 (14,890 ) 511,289 U.S. Treasury bills 9,957 — (94 ) 9,863 Total securities available for sale $ 667,419 $ 717 $ (16,996 ) $ 651,140 Held to maturity securities: Obligations of states and political subdivisions $ 12,537 $ 7 $ (240 ) $ 12,304 Agency mortgage-backed securities 56,394 — (1,789 ) 54,605 Total securities held to maturity $ 68,931 $ 7 $ (2,029 ) $ 66,909 December 31, 2017 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 99,878 $ 6 $ (660 ) $ 99,224 Obligations of states and political subdivisions 34,181 674 (213 ) 34,642 Agency mortgage-backed securities 513,082 727 (6,293 ) 507,516 Total securities available for sale $ 647,141 $ 1,407 $ (7,166 ) $ 641,382 Held to maturity securities: Obligations of states and political subdivisions $ 14,031 $ 69 $ (46 ) $ 14,054 Agency mortgage-backed securities 59,718 16 (330 ) 59,404 Total securities held to maturity $ 73,749 $ 85 $ (376 ) $ 73,458
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of debt securities at June 30, 2018 , by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately 5 years. Available for sale Held to maturity (in thousands) Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 2,675 $ 2,690 $ — $ — Due after one year through five years 121,187 119,369 867 866 Due after five years through ten years 12,703 12,804 10,804 10,603 Due after ten years 5,044 4,988 866 835 Agency mortgage-backed securities 525,810 511,289 56,394 54,605 $ 667,419 $ 651,140 $ 68,931 $ 66,909
Schedule of Unrealized Loss on Investments	The following table represents a summary of investment securities that had an unrealized loss: June 30, 2018 Less than 12 months 12 months or more Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Obligations of U.S. Government-sponsored enterprises $ 98,044 $ 1,858 $ — $ — $ 98,044 $ 1,858 Obligations of states and political subdivisions 24,883 369 364 25 25,247 394 Agency mortgage-backed securities 392,242 10,617 134,128 6,062 526,370 16,679 U.S. Treasury bills 9,863 94 — — 9,863 94 $ 525,032 $ 12,938 $ 134,492 $ 6,087 $ 659,524 $ 19,025 December 31, 2017 Less than 12 months 12 months or more Total (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Obligations of U.S. Government-sponsored enterprises $ 89,309 $ 660 $ — $ — $ 89,309 $ 660 Obligations of states and political subdivisions 13,951 259 — — 13,951 259 Agency mortgage-backed securities 469,655 6,034 12,229 589 481,884 6,623 $ 572,915 $ 6,953 $ 12,229 $ 589 $ 585,144 $ 7,542

Loans (Tables)

Loans (Tables) - Portfolio loans, net	6 Months Ended
	Jun. 30, 2018
Non-covered Loans [Line Items]
Summary of Portfolio Loans by Category	The table below shows the loan portfolio composition including carrying value categorized by loans accounted for at amortized cost, which includes our originated loans, and by loans accounted for as PCI. (in thousands) June 30, 2018 December 31, 2017 Loans accounted for at amortized cost $ 4,214,996 $ 4,022,896 Loans accounted for as PCI 60,765 74,154 Total loans $ 4,275,761 $ 4,097,050 The following tables refer to loans not accounted for as PCI loans. Below is a summary of loans by category at June 30, 2018 and December 31, 2017 : (in thousands) June 30, 2018 December 31, 2017 Commercial and industrial $ 2,038,040 $ 1,918,720 Real estate: Commercial - investor owned 819,427 769,275 Commercial - owner occupied 593,138 554,589 Construction and land development 300,117 303,091 Residential 318,055 341,312 Total real estate loans 2,030,737 1,968,267 Consumer and other 147,304 137,234 Loans, before unearned loan fees 4,216,081 4,024,221 Unearned loan fees, net (1,085 ) (1,325 ) Loans, including unearned loan fees $ 4,214,996 $ 4,022,896
Summary of Allowance for Loan Losses and the Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method	A summary of the activity in the allowance for loan losses and the recorded investment in loans by class and category based on impairment methodology through June 30, 2018 , and at December 31, 2017 , is as follows: (in thousands) Commercial and industrial CRE - investor owned CRE - owner occupied Construction and land development Residential real estate Consumer and other Total Allowance for loan losses: Balance at December 31, 2017 $ 26,406 $ 3,890 $ 3,308 $ 1,487 $ 2,237 $ 838 $ 38,166 Provision (provision reversal) for loan losses 780 648 190 35 259 (41 ) 1,871 Losses charged off (732 ) — — — (254 ) (49 ) (1,035 ) Recoveries 956 8 4 206 73 14 1,261 Balance at March 31, 2018 $ 27,410 $ 4,546 $ 3,502 $ 1,728 $ 2,315 $ 762 $ 40,263 Provision (provision reversal) for loan losses 2,852 5 340 (206 ) (573 ) (33 ) 2,385 Losses charged off (956 ) — — — (38 ) (33 ) (1,027 ) Recoveries 118 10 3 168 59 28 386 Balance at June 30, 2018 $ 29,424 $ 4,561 $ 3,845 $ 1,690 $ 1,763 $ 724 — $ 42,007 (in thousands) Commercial and industrial CRE - investor owned CRE - owner occupied Construction and land development Residential real estate Consumer and other Total Balance June 30, 2018 Allowance for loan losses - Ending balance: Individually evaluated for impairment $ 3,667 $ — $ 219 $ — $ — $ — $ 3,886 Collectively evaluated for impairment 25,757 4,561 3,626 1,690 1,763 724 38,121 Total $ 29,424 $ 4,561 $ 3,845 $ 1,690 $ 1,763 $ 724 $ 42,007 Loans - Ending balance: Individually evaluated for impairment $ 11,226 $ 410 $ 2,150 $ 435 $ 1,669 $ 318 $ 16,208 Collectively evaluated for impairment 2,026,814 819,017 590,988 299,682 316,386 145,901 4,198,788 Total $ 2,038,040 $ 819,427 $ 593,138 $ 300,117 $ 318,055 $ 146,219 $ 4,214,996 Balance December 31, 2017 Allowance for loan losses - Ending balance: Individually evaluated for impairment $ 2,508 $ — $ 71 $ — $ — $ — $ 2,579 Collectively evaluated for impairment 23,898 3,890 3,237 1,487 2,237 838 35,587 Total $ 26,406 $ 3,890 $ 3,308 $ 1,487 $ 2,237 $ 838 $ 38,166 Loans - Ending balance: Individually evaluated for impairment $ 12,665 $ 422 $ 1,975 $ 136 $ 1,602 $ 375 $ 17,175 Collectively evaluated for impairment 1,906,055 768,853 552,614 302,955 339,710 135,534 4,005,721 Total $ 1,918,720 $ 769,275 $ 554,589 $ 303,091 $ 341,312 $ 135,909 $ 4,022,896
Summary of Portfolio Loans Individually Evaluated for Impairment and Recorded Investment in Impaired Non-Covered Loans by Category	A summary of nonperforming loans individually evaluated for impairment by category at June 30, 2018 and December 31, 2017 , and the income recognized on impaired loans is as follows: June 30, 2018 (in thousands) Unpaid Recorded Recorded Allowance Total Related Allowance Average Commercial and industrial $ 20,915 $ 1,900 $ 9,326 $ 11,226 $ 3,667 $ 12,591 Real estate: Commercial - investor owned 557 410 — 410 — 415 Commercial - owner occupied 751 259 484 743 219 750 Construction and land development 444 435 — 435 — 494 Residential 1,835 1,669 — 1,669 — 1,688 Consumer and other 332 318 — 318 — 333 Total $ 24,834 $ 4,991 $ 9,810 $ 14,801 $ 3,886 $ 16,271 December 31, 2017 (in thousands) Unpaid Recorded Recorded Allowance Total Related Allowance Average Commercial and industrial $ 20,750 $ 2,321 $ 10,344 $ 12,665 $ 2,508 $ 16,270 Real estate: Commercial - investor owned 560 422 — 422 — 521 Commercial - owner occupied 487 — 487 487 71 490 Construction and land development 441 136 — 136 — 331 Residential 1,730 1,602 — 1,602 — 1,735 Consumer and other 375 375 — 375 — 375 Total $ 24,343 $ 4,856 $ 10,831 $ 15,687 $ 2,579 $ 19,722 Three months ended June 30, Six months ended June 30, (in thousands) 2018 2017 2018 2017 Total interest income that would have been recognized under original terms $ 467 $ 340 $ 1,001 $ 655 Total cash received and recognized as interest income on non-accrual loans 78 16 89 39 Total interest income recognized on accruing, impaired loans 13 14 23 47 The recorded investment in nonperforming loans by category at June 30, 2018 and December 31, 2017 , is as follows: June 30, 2018 (in thousands) Non-accrual Restructured, not on non-accrual Total Commercial and industrial $ 10,593 $ 633 $ 11,226 Real estate: Commercial - investor owned 410 — 410 Commercial - owner occupied 743 — 743 Construction and land development 435 — 435 Residential 1,669 — 1,669 Consumer and other 318 — 318 Total $ 14,168 $ 633 $ 14,801 December 31, 2017 (in thousands) Non-accrual Restructured, not on non-accrual Total Commercial and industrial $ 11,946 $ 719 $ 12,665 Real estate: Commercial - investor owned 422 — 422 Commercial - owner occupied 487 — 487 Construction and land development 136 — 136 Residential 1,602 — 1,602 Consumer and other 375 — 375 Total $ 14,968 $ 719 $ 15,687
Summary of Recorded Investment by Category for Portfolio Loans Restructured
Summary of Recorded Investment by Category for Portfolio Loans Restructured and Subsequently Defaulted	As of June 30, 2018 , the Company had $2.0 million in specific reserves allocated to $7.9 million of loans that have been restructured. During the three and six months ended June 30, 2018 and 2017, there were no portfolio loans that subsequently defaulted.
Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category	The aging of the recorded investment in past due loans by portfolio class and category at June 30, 2018 and December 31, 2017 is shown below. June 30, 2018 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ 2,180 $ 8,070 $ 10,250 $ 2,027,790 $ 2,038,040 Real estate: Commercial - investor owned 1,141 — 1,141 818,286 819,427 Commercial - owner occupied 958 484 1,442 591,696 593,138 Construction and land development — — — 300,117 300,117 Residential 895 1,031 1,926 316,129 318,055 Consumer and other — — — 146,219 146,219 Total $ 5,174 $ 9,585 $ 14,759 $ 4,200,237 $ 4,214,996 December 31, 2017 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ 7,882 $ 1,770 $ 9,652 $ 1,909,068 $ 1,918,720 Real estate: Commercial - investor owned 934 — 934 768,341 769,275 Commercial - owner occupied — — — 554,589 554,589 Construction and land development 76 — 76 303,015 303,091 Residential 1,529 945 2,474 338,838 341,312 Consumer and other 407 — 407 135,502 135,909 Total $ 10,828 $ 2,715 $ 13,543 $ 4,009,353 $ 4,022,896
Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category	The recorded investment by risk category of the loans by portfolio class and category at June 30, 2018 , which is based upon the most recent analysis performed, and December 31, 2017 is as follows: June 30, 2018 (in thousands) Pass (1-6) Watch (7) Substandard (8) Total Commercial and industrial $ 1,853,440 $ 128,087 $ 56,513 $ 2,038,040 Real estate: Commercial - investor owned 785,920 28,442 5,065 819,427 Commercial - owner occupied 537,740 49,926 5,472 593,138 Construction and land development 289,263 10,301 553 300,117 Residential 307,727 2,859 7,469 318,055 Consumer and other 145,289 612 318 146,219 Total $ 3,919,379 $ 220,227 $ 75,390 $ 4,214,996 December 31, 2017 (in thousands) Pass (1-6) Watch (7) Substandard (8) Total Commercial and industrial $ 1,769,102 $ 94,002 $ 55,616 $ 1,918,720 Real estate: Commercial - investor owned 754,010 10,840 4,425 769,275 Commercial - owner occupied 514,616 34,440 5,533 554,589 Construction and land development 292,766 9,983 342 303,091 Residential 329,742 3,648 7,922 341,312 Consumer and other 134,704 10 1,195 135,909 Total $ 3,794,940 $ 152,923 $ 75,033 $ 4,022,896

Purchased Credit Impaired ("P23

Purchased Credit Impaired ("PCI") Loans (Tables)	6 Months Ended
	Jun. 30, 2018
Covered Loans [Line Items]
Rollforward of PCI Loans, Net of Allowance for Loan Losses	The following table is a roll forward of PCI loans, net of the allowance for loan losses, for the six months ended June 30, 2018 and 2017 . (in thousands) Contractual Cashflows Non-accretable Difference Accretable Yield Carrying Amount Balance December 31, 2017 $ 112,710 $ 29,005 $ 13,964 $ 69,741 Principal reductions and interest payments (22,667 ) — — (22,667 ) Accretion of loan discount — — (3,400 ) 3,400 Changes in contractual and expected cash flows due to remeasurement 3,281 (8,771 ) 4,124 7,928 Balance June 30, 2018 $ 93,324 $ 20,234 $ 14,688 $ 58,402 Balance December 31, 2016 $ 66,003 $ 18,902 $ 13,176 $ 33,925 Acquisitions 68,763 14,296 5,312 49,155 Principal reductions and interest payments (10,781 ) — — (10,781 ) Accretion of loan discount — — (3,534 ) 3,534 Changes in contractual and expected cash flows due to remeasurement 5,641 (1,383 ) 1,328 5,696 Reductions due to disposals (5,070 ) (1,317 ) (1,398 ) (2,355 ) Balance June 30, 2017 $ 124,556 $ 30,498 $ 14,884 $ 79,174
Covered Loans
Covered Loans [Line Items]
Summary of PCI Loans by Category	Below is a summary of PCI loans by category at June 30, 2018 and December 31, 2017 : June 30, 2018 December 31, 2017 (in thousands) Weighted- Average Risk Rating 1 Recorded Investment PCI Loans Weighted- Average Risk Rating 1 Recorded Investment PCI Loans Commercial and industrial 6.47 $ 2,711 6.38 $ 3,212 Real estate: Commercial - investor owned 7.37 30,539 7.36 42,887 Commercial - owner occupied 7.02 13,269 6.48 11,332 Construction and land development 6.02 5,121 5.99 5,883 Residential 6.05 9,102 5.99 10,781 Consumer and other 5.20 23 2.84 59 Total $ 60,765 $ 74,154 1 Risk ratings are based on the borrower's contractual obligation, which is not reflective of the purchase discount.
Summary of Aging of Recorded Investment in Past Due PCI Loans by Portfolio Class and Category	The aging of the recorded investment in past due PCI loans by portfolio class and category at June 30, 2018 and December 31, 2017 is shown below: June 30, 2018 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ — $ — $ — $ 2,711 $ 2,711 Real estate: Commercial - investor owned 685 — 685 29,854 30,539 Commercial - owner occupied 735 728 1,463 11,806 13,269 Construction and land development 149 — 149 4,972 5,121 Residential 37 275 312 8,790 9,102 Consumer and other 1 — 1 22 23 Total $ 1,607 $ 1,003 $ 2,610 $ 58,155 $ 60,765 December 31, 2017 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ — $ — $ — $ 3,212 $ 3,212 Real estate: Commercial - investor owned — 3,034 3,034 39,853 42,887 Commercial - owner occupied — 673 673 10,659 11,332 Construction and land development — — — 5,883 5,883 Residential 328 255 583 10,198 10,781 Consumer and other — — — 59 59 Total $ 328 $ 3,962 $ 4,290 $ 69,864 $ 74,154
Summary of FDIC Loss Share Receivable	Outstanding customer balances on PCI loans were $81.1 million and $94.9 million as of June 30, 2018 , and December 31, 2017 , respectively.

Commitments (Tables)

Commitments (Tables)	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Commitments	The contractual amounts of off-balance-sheet financial instruments as of June 30, 2018 , and December 31, 2017 , are as follows: (in thousands) June 30, 2018 December 31, 2017 Commitments to extend credit $ 1,272,570 $ 1,298,423 Letters of credit 54,647 73,790

Derivative Financial Instrume25

Derivative Financial Instruments (Tables) - Client-Related	6 Months Ended
	Jun. 30, 2018
Derivative [Line Items]
Schedule of Notional Amounts and Fair Values of Derivative Instruments and Client-Related Derivative Instruments	The table below summarizes the notional amounts and fair values of the client-related derivative instruments: Asset Derivatives (Other Assets) Liability Derivatives (Other Liabilities) Notional Amount Fair Value Fair Value (in thousands) June 30, December 31, June 30, December 31, June 30, December 31, Non-designated hedging instruments Interest rate swap contracts $ 404,643 $ 394,852 $ 4,016 $ 2,061 $ 4,016 $ 2,061 Foreign exchange forward contracts 1,342 1,528 1,342 1,528 1,342 1,528
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	For the three and six months ended June 30, 2018 and 2017 , the gains and losses offset each other due to the Company's hedging of the client swaps and foreign exchange contracts with other bank counterparties.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Summary of Financial Instruments Measured at Fair Value on a Recurring Basis	The following table summarizes financial instruments measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017 , segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: June 30, 2018 (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fair Value Assets Securities available for sale Obligations of U.S. Government-sponsored enterprises $ — $ 98,044 $ — $ 98,044 Obligations of states and political subdivisions — 31,944 — 31,944 Residential mortgage-backed securities — 511,289 — 511,289 U.S. Treasury bills — 9,863 — 9,863 Total securities available for sale $ — $ 651,140 $ — $ 651,140 Other investments 179 — — 179 State tax credits held for sale — — 299 299 Derivative financial instruments — 5,358 — 5,358 Total assets $ 179 $ 656,498 $ 299 $ 656,976 Liabilities Derivative financial instruments $ — $ 5,358 $ — $ 5,358 Total liabilities $ — $ 5,358 $ — $ 5,358 December 31, 2017 (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Fair Value Assets Securities available for sale Obligations of U.S. Government-sponsored enterprises $ — $ 99,224 $ — $ 99,224 Obligations of states and political subdivisions — 34,642 — 34,642 Residential mortgage-backed securities — 507,516 — 507,516 Total securities available for sale $ — $ 641,382 $ — $ 641,382 State tax credits held for sale — — 400 400 Derivative financial instruments — 3,589 — 3,589 Total assets $ — $ 644,971 $ 400 $ 645,371 Liabilities Derivative financial instruments $ — $ 3,589 $ — $ 3,589 Total liabilities $ — $ 3,589 $ — $ 3,589
Schedule of Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis	The following table presents the changes in Level 3 financial instruments measured at fair value on a recurring basis as of June 30, 2018 and 2017 . • Purchases, sales, issuances and settlements . There were no Level 3 purchases during the quarters ended June 30, 2018 or 2017 . • Transfers in and/or out of Level 3 . There were no Level 3 transfers during the quarter ended June 30, 2018 . There was $3.1 million in Level 3 transfers to Level 2 during the quarter ended June 30, 2017 . Securities available for sale, at fair value Three months ended June 30, Six months ended June 30, (in thousands) 2018 2017 2018 2017 Beginning balance $ — $ 3,093 $ — $ 3,089 Total gains: Included in other comprehensive income — — — 4 Purchases, sales, issuances and settlements: Purchases — — — — Transfer in and/or out of Level 3 — (3,093 ) — (3,093 ) Ending balance $ — $ — $ — $ — Change in unrealized gains relating to assets still held at the reporting date $ — $ — $ — $ — State tax credits held for sale Three months ended June 30, Six months ended June 30, (in thousands) 2018 2017 2018 2017 Beginning balance $ 350 $ 1,458 $ 400 $ 3,585 Total gains: Included in earnings 3 9 6 49 Purchases, sales, issuances and settlements: Sales (54 ) (193 ) (107 ) (2,360 ) Ending balance $ 299 $ 1,274 $ 299 $ 1,274 Change in unrealized gains (losses) relating to assets still held at the reporting date $ (13 ) $ (49 ) $ (26 ) $ (655 )
Summary of Financial Instruments and Non-Financial Assets Measured at Fair Value on a Non-Recurring Basis	The following table presents financial instruments and non-financial assets measured at fair value on a non-recurring basis as of June 30, 2018 . (1) (1) (1) (1) (in thousands) Total Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant (Level 3) Total losses for the three Total losses for the six Impaired loans $ 1,486 $ — $ — $ 1,486 $ 900 $ 1,609 Other real estate 454 — — 454 1 44 Total $ 1,940 $ — $ — $ 1,940 $ 901 $ 1,653 (1) The amounts represent only balances measured at fair value during the period and still held as of the reporting date.
Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets	Following is a summary of the carrying amounts and fair values of the Company’s financial instruments on the consolidated balance sheets at June 30, 2018 and December 31, 2017 . Fair values that are not estimable are listed at the carrying value. June 30, 2018 December 31, 2017 (in thousands) Carrying Amount Estimated fair value Carrying Amount Estimated fair value Balance sheet assets Cash and due from banks $ 91,851 $ 91,851 $ 91,084 $ 91,084 Federal funds sold 1,445 1,445 1,223 1,223 Interest-bearing deposits 86,141 86,141 63,661 63,661 Securities available for sale 651,140 651,140 641,382 641,382 Securities held to maturity 68,931 66,909 73,749 73,458 Other investments, at cost 36,132 36,132 26,661 26,661 Loans held for sale 1,388 1,388 3,155 3,155 Derivative financial instruments 5,358 5,358 3,589 3,589 Portfolio loans, net 4,231,391 4,252,679 4,054,473 4,096,741 State tax credits, held for sale 46,481 45,069 43,468 44,271 Accrued interest receivable 17,808 17,808 14,069 14,069 Balance sheet liabilities Deposits 4,247,912 4,242,061 4,156,414 4,153,323 Subordinated debentures and notes 118,131 105,889 118,105 105,031 Federal Home Loan Bank advances 361,534 361,531 172,743 172,893 Other borrowings 167,216 167,086 253,674 253,530 Derivative financial instruments 5,358 5,358 3,589 3,589 Accrued interest payable 1,884 1,884 1,730 1,730
Schedule of Estimated Fair Values of Financial Instruments Not Recorded at Fair Value on Balance Sheet	The following table presents the level in the fair value hierarchy for the estimated fair values of only the Company’s financial instruments that are not already presented on the condensed consolidated balance sheets at fair value at June 30, 2018 , and December 31, 2017 . Estimated Fair Value Measurement at Reporting Date Using Balance at June 30, 2018 (in thousands) Level 1 Level 2 Level 3 Financial Assets: Securities held to maturity $ — $ 66,909 $ — $ 66,909 Portfolio loans, net — — 4,252,679 4,252,679 State tax credits, held for sale — — 44,770 44,770 Financial Liabilities: Deposits 3,574,581 — 667,480 4,242,061 Subordinated debentures and notes — 105,889 — 105,889 Federal Home Loan Bank advances — 361,531 — 361,531 Other borrowings — 167,086 — 167,086 Estimated Fair Value Measurement at Reporting Date Using Balance at December 31, 2017 (in thousands) Level 1 Level 2 Level 3 Financial Assets: Securities held to maturity $ — $ 73,458 $ — $ 73,458 Portfolio loans, net — — 4,096,741 4,096,741 State tax credits, held for sale — — 43,871 43,871 Financial Liabilities: Deposits 3,577,641 — 575,682 4,153,323 Subordinated debentures and notes — 105,031 — 105,031 Federal Home Loan Bank advances — 172,893 — 172,893 Other borrowings — 253,530 — 253,530

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income as reported	$ 22,251	$ 11,955	$ 43,172	$ 24,346
Weighted average common shares outstanding (in shares)	23,124,000	23,475,000	23,119,000	22,706,000
Additional dilutive common stock equivalents (in shares)	194,000	257,000	213,000	314,000
Weighted average diluted common shares outstanding (in shares)	23,318,000	23,732,000	23,332,000	23,020,000
Basic earnings per common share (in dollars per share)	$ 0.96	$ 0.51	$ 1.87	$ 1.07
Diluted earnings per common share (in dollars per share)	$ 0.95	$ 0.50	$ 1.85	$ 1.06
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			0	0

Investments - Schedule of Avail

Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 68,931	$ 73,749
Gross Unrealized Gains	7	85
Gross Unrealized Losses	(2,029)	(376)
Fair Value	66,909	73,458
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	667,419	647,141
Gross Unrealized Gains	717	1,407
Gross Unrealized Losses	(16,996)	(7,166)
Fair Value	651,140	641,382
US Treasury Bill Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,957
Gross Unrealized Gains	0
Gross Unrealized Losses	(94)
Fair Value	9,863
Obligations of U.S. Government-sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	99,902	99,878
Gross Unrealized Gains	0	6
Gross Unrealized Losses	(1,858)	(660)
Fair Value	98,044	99,224
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	31,750	34,181
Gross Unrealized Gains	348	674
Gross Unrealized Losses	(154)	(213)
Fair Value	31,944	34,642
Agency mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	525,810	513,082
Gross Unrealized Gains	369	727
Gross Unrealized Losses	(14,890)	(6,293)
Fair Value	511,289	507,516
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	12,537	14,031
Gross Unrealized Gains	7	69
Gross Unrealized Losses	(240)	(46)
Fair Value	12,304	14,054
Agency mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	56,394	59,718
Gross Unrealized Gains	0	16
Gross Unrealized Losses	(1,789)	(330)
Fair Value	$ 54,605	$ 59,404

Investments - Investments Class

Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available for sale, Amortized Cost
Due in one year or less	$ 2,675
Due after one year through five years	121,187
Due after five years through ten years	12,703
Due after ten years	5,044
Agency mortgage-backed securities	525,810
Amortized Cost	667,419	$ 647,141
Available for sale, Estimated Fair Value
Due in one year or less	2,690
Due after one year through five years	119,369
Due after five years through ten years	12,804
Due after ten years	4,988
Agency mortgage-backed securities	511,289
Available for sale, fair value	651,140	641,382
Held to maturity, Amortized Cost
Due in one year or less	0
Due after one year through five years	867
Due after five years through ten years	10,804
Due after ten years	866
Agency mortgage-backed securities	56,394
Amortized Cost	68,931	73,749
Held to maturity, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	866
Due after five years through ten years	10,603
Due after ten years	835
Agency mortgage-backed securities	54,605
Held to maturity, fair value	$ 66,909	$ 73,458

Investments - Schedule of Unrea

Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 525,032	$ 572,915
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	12,938	6,953
12 months or more, fair value	134,492	12,229
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6,087	589
Total, fair value	659,524	585,144
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	19,025	7,542
Obligations of U.S. Government-sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	98,044	89,309
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,858
Securities Available for Sale, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses		660
12 months or more, fair value	0	0
Securities Available for Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses		0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Total, fair value	98,044	89,309
Securities Available for Sale Continuous Unrealized Loss Position, Total Aggregate Losses		660
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,858
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	24,883	13,951
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	369	259
12 months or more, fair value	364	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	25	0
Total, fair value	25,247	13,951
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	394	259
Agency mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	392,242	469,655
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	10,617	6,034
12 months or more, fair value	134,128	12,229
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	6,062	589
Total, fair value	526,370	481,884
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	16,679	$ 6,623
US Treasury Bill Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	9,863
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	94
12 months or more, fair value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Total, fair value	9,863
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 94

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Other investments, at cost	$ 36,132	$ 26,661
Maximum percentage of shareholders' equity security holdings held of one issuer	10.00%	10.00%
Available-for-sale securities pledged as collateral, fair value	$ 376,000	$ 500,000
Mortgage-backed securities, weighted average life	5 years

Loans - Summary of Portfolio Lo

Loans - Summary of Portfolio Loans by Category (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, including unearned loan fees	$ 4,275,761	$ 4,097,050
Portfolio loans, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	4,216,081	4,024,221
Unearned loan fees, net	(1,085)	(1,325)
Loans, including unearned loan fees	4,214,996	4,022,896
Portfolio loans, net | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	2,038,040	1,918,720
Portfolio loans, net | Commercial - investor owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	819,427	769,275
Portfolio loans, net | Commercial - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	593,138	554,589
Portfolio loans, net | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	300,117	303,091
Portfolio loans, net | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	318,055	341,312
Portfolio loans, net | Total real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	2,030,737	1,968,267
Portfolio loans, net | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, before unearned loan fees	147,304	137,234
Loans, including unearned loan fees	146,219	135,909
Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	60,765	74,154
Loans, before unearned loan fees	60,765	74,154
Covered Loans [Member] | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	2,711	3,212
Loans, before unearned loan fees	2,711	3,212
Covered Loans [Member] | Commercial - investor owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	30,539	42,887
Loans, before unearned loan fees	30,539	42,887
Covered Loans [Member] | Commercial - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	13,269	11,332
Loans, before unearned loan fees	13,269	11,332
Covered Loans [Member] | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	5,121	5,883
Loans, before unearned loan fees	5,121	5,883
Covered Loans [Member] | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	9,102	10,781
Loans, before unearned loan fees	9,102	10,781
Covered Loans [Member] | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount, Covered	23	59
Loans, before unearned loan fees	$ 23	$ 59

Loans - Summary of Allowance fo

Loans - Summary of Allowance for Loan Losses by Portfolio Class and Category (Details) - Portfolio loans, net - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Mar. 31, 2018
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2017	$ 40,263	$ 38,166
Provision (provision reversal) for loan losses	2,385	1,871
Losses charged off	(1,027)	(1,035)
Recoveries	386	1,261
Balance	42,007	40,263
Commercial and industrial
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2017	27,410	26,406
Provision (provision reversal) for loan losses	2,852	780
Losses charged off	(956)	(732)
Recoveries	118	956
Balance	29,424	27,410
CRE - investor owned
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2017	4,546	3,890
Provision (provision reversal) for loan losses	5	648
Losses charged off	0	0
Recoveries	10	8
Balance	4,561	4,546
CRE - owner occupied
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2017	3,502	3,308
Provision (provision reversal) for loan losses	340	190
Losses charged off	0	0
Recoveries	3	4
Balance	3,845	3,502
Construction and land development
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2017	1,728	1,487
Provision (provision reversal) for loan losses	(206)	35
Losses charged off	0	0
Recoveries	168	206
Balance	1,690	1,728
Residential real estate
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2017	2,315	2,237
Provision (provision reversal) for loan losses	(573)	259
Losses charged off	(38)	(254)
Recoveries	59	73
Balance	1,763	2,315
Consumer and other
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2017	762	838
Provision (provision reversal) for loan losses	(33)	(41)
Losses charged off	(33)	(49)
Recoveries	28	14
Balance	$ 724	$ 762

Loans - Summary of Recorded Inv

Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Loans - Ending balance:
Loans and Leases Receivable, Gross	$ 4,275,761		$ 4,097,050
Portfolio loans, net
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Individually evaluated for impairment	3,886		2,579
Collectively evaluated for impairment	38,121		35,587
Total	42,007	$ 40,263	38,166
Loans - Ending balance:
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	(1,085)		(1,325)
Individually evaluated for impairment	16,208		17,175
Collectively evaluated for impairment	4,198,788		4,005,721
Total	4,216,081		4,024,221
Loans and Leases Receivable, Gross	4,214,996		4,022,896
Portfolio loans, net | Commercial and industrial
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Individually evaluated for impairment	3,667		2,508
Collectively evaluated for impairment	25,757		23,898
Total	29,424	27,410	26,406
Loans - Ending balance:
Individually evaluated for impairment	11,226		12,665
Collectively evaluated for impairment	2,026,814		1,906,055
Total	2,038,040		1,918,720
Portfolio loans, net | CRE - investor owned
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	4,561		3,890
Total	4,561	4,546	3,890
Loans - Ending balance:
Individually evaluated for impairment	410		422
Collectively evaluated for impairment	819,017		768,853
Total	819,427		769,275
Portfolio loans, net | CRE - owner occupied
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Individually evaluated for impairment	219		71
Collectively evaluated for impairment	3,626		3,237
Total	3,845	3,502	3,308
Loans - Ending balance:
Individually evaluated for impairment	2,150		1,975
Collectively evaluated for impairment	590,988		552,614
Total	593,138		554,589
Portfolio loans, net | Construction and land development
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	1,690		1,487
Total	1,690	1,728	1,487
Loans - Ending balance:
Individually evaluated for impairment	435		136
Collectively evaluated for impairment	299,682		302,955
Total	300,117		303,091
Portfolio loans, net | Residential real estate
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	1,763		2,237
Total	1,763	2,315	2,237
Loans - Ending balance:
Individually evaluated for impairment	1,669		1,602
Collectively evaluated for impairment	316,386		339,710
Total	318,055		341,312
Portfolio loans, net | Consumer and other
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	724		838
Total	724	$ 762	838
Loans - Ending balance:
Individually evaluated for impairment	318		375
Collectively evaluated for impairment	145,901		135,534
Total	147,304		137,234
Loans and Leases Receivable, Gross	$ 146,219		$ 135,909

Loans - Summary of Portfolio 35

Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	$ 900		$ 900
Portfolio loans, net
Financing Receivable, Impaired [Line Items]
Provision for Loan, Lease, and Other Losses	(2,385)	$ (1,871)
Unpaid Contractual Principal Balance	24,834		24,834	$ 24,343
Recorded Investment With No Allowance	4,991		4,991	4,856
Recorded Investment With Allowance	9,810		9,810	10,831
Total Recorded Investment	14,801		14,801	15,687
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3,886		3,886	2,579
Impaired Financing Receivable, Related Allowance	3,886		3,886	2,579
Average Recorded Investment			16,271	19,722
Financing Receivable, Allowance for Credit Losses, Write-downs	(1,027)	(1,035)
Financing Receivable, Allowance for Credit Losses, Recovery	386	1,261
Financing Receivable, Allowance for Credit Losses	42,007	40,263	42,007	38,166
Portfolio loans, net | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Provision for Loan, Lease, and Other Losses	(2,852)	(780)
Unpaid Contractual Principal Balance	20,915		20,915	20,750
Recorded Investment With No Allowance	1,900		1,900	2,321
Recorded Investment With Allowance	9,326		9,326	10,344
Total Recorded Investment	11,226		11,226	12,665
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3,667		3,667	2,508
Impaired Financing Receivable, Related Allowance	3,667		3,667	2,508
Average Recorded Investment			12,591	16,270
Financing Receivable, Allowance for Credit Losses, Write-downs	(956)	(732)
Financing Receivable, Allowance for Credit Losses, Recovery	118	956
Financing Receivable, Allowance for Credit Losses	29,424	27,410	29,424	26,406
Portfolio loans, net | Commercial - investor owned
Financing Receivable, Impaired [Line Items]
Provision for Loan, Lease, and Other Losses	(5)	(648)
Unpaid Contractual Principal Balance	557		557	560
Recorded Investment With No Allowance	410		410	422
Recorded Investment With Allowance	0		0	0
Total Recorded Investment	410		410	422
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0	0
Impaired Financing Receivable, Related Allowance	0		0	0
Average Recorded Investment			415	521
Financing Receivable, Allowance for Credit Losses, Write-downs	0	0
Financing Receivable, Allowance for Credit Losses, Recovery	10	8
Financing Receivable, Allowance for Credit Losses	4,561	4,546	4,561	3,890
Portfolio loans, net | Commercial - owner occupied
Financing Receivable, Impaired [Line Items]
Provision for Loan, Lease, and Other Losses	(340)	(190)
Unpaid Contractual Principal Balance	751		751	487
Recorded Investment With No Allowance	259		259	0
Recorded Investment With Allowance	484		484	487
Total Recorded Investment	743		743	487
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	219		219	71
Impaired Financing Receivable, Related Allowance	219		219	71
Average Recorded Investment			750	490
Financing Receivable, Allowance for Credit Losses, Write-downs	0	0
Financing Receivable, Allowance for Credit Losses, Recovery	3	4
Financing Receivable, Allowance for Credit Losses	3,845	3,502	3,845	3,308
Portfolio loans, net | Construction and land development
Financing Receivable, Impaired [Line Items]
Provision for Loan, Lease, and Other Losses	206	(35)
Unpaid Contractual Principal Balance	444		444	441
Recorded Investment With No Allowance	435		435	136
Recorded Investment With Allowance	0		0	0
Total Recorded Investment	435		435	136
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0	0
Impaired Financing Receivable, Related Allowance	0		0	0
Average Recorded Investment			494	331
Financing Receivable, Allowance for Credit Losses, Write-downs	0	0
Financing Receivable, Allowance for Credit Losses, Recovery	168	206
Financing Receivable, Allowance for Credit Losses	1,690	1,728	1,690	1,487
Portfolio loans, net | Residential real estate
Financing Receivable, Impaired [Line Items]
Provision for Loan, Lease, and Other Losses	573	(259)
Unpaid Contractual Principal Balance	1,835		1,835	1,730
Recorded Investment With No Allowance	1,669		1,669	1,602
Recorded Investment With Allowance	0		0	0
Total Recorded Investment	1,669		1,669	1,602
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0	0
Impaired Financing Receivable, Related Allowance	0		0	0
Average Recorded Investment			1,688	1,735
Financing Receivable, Allowance for Credit Losses, Write-downs	(38)	(254)
Financing Receivable, Allowance for Credit Losses, Recovery	59	73
Financing Receivable, Allowance for Credit Losses	1,763	2,315	1,763	2,237
Portfolio loans, net | Consumer and other
Financing Receivable, Impaired [Line Items]
Provision for Loan, Lease, and Other Losses	33	41
Unpaid Contractual Principal Balance	332		332	375
Recorded Investment With No Allowance	318		318	375
Recorded Investment With Allowance	0		0	0
Total Recorded Investment	318		318	375
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0	0
Impaired Financing Receivable, Related Allowance	0		0	0
Average Recorded Investment			333	375
Financing Receivable, Allowance for Credit Losses, Write-downs	(33)	(49)
Financing Receivable, Allowance for Credit Losses, Recovery	28	14
Financing Receivable, Allowance for Credit Losses	$ 724	$ 762	$ 724	$ 838

Loans - Summary of Past Due and

Loans - Summary of Past Due and Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Receivables [Abstract]
Total interest income that would have been recognized under original terms	$ 467	$ 340	$ 1,001	$ 655
Total cash received and recognized as interest income on non-accrual loans	78	16	89	39
Total interest income recognized on accruing, impaired loans	$ 13	$ 14	$ 23	$ 47

Loans - Narrative (Details)

Loans - Narrative (Details)	Jun. 30, 2018USD ($)	Dec. 31, 2017USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans over 90 days past due and still accruing interest | loan		0
Unadvanced commitments on impaired loans		$ 0
Specific reserves on restructured loans	$ 2,000,000
Restructuring Reserve	7,900,000
Unadvanced Commitment on Impaired Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Estimated losses attributable to unadvanced commitments on impaired loans	400,000	350,000
Non-Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructuring Reserve	633,000	719,000
Financing Receivable, Gross	4,216,081,000	4,024,221,000
Non-Covered Loans | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructuring Reserve	0	0
Financing Receivable, Gross	$ 147,304,000	$ 137,234,000

Loans - Summary of Recorded I38

Loans - Summary of Recorded Investment in Impaired Portfolio Loans by Category (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Restructured, not on non-accrual	$ 7,900
Impaired Financing Receivable, Related Allowance	900
Non-Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Recorded Investment	14,801	$ 15,687
Non-accrual	14,168	14,968
Restructured, not on non-accrual	633	719
Impaired Financing Receivable, Related Allowance	3,886	2,579
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3,886	2,579
Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Recorded Investment	11,226	12,665
Non-accrual	10,593	11,946
Restructured, not on non-accrual	633	719
Impaired Financing Receivable, Related Allowance	3,667	2,508
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3,667	2,508
Non-Covered Loans | Commercial - investor owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Recorded Investment	410	422
Non-accrual	410	422
Restructured, not on non-accrual	0	0
Impaired Financing Receivable, Related Allowance	0	0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0
Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Recorded Investment	743	487
Non-accrual	743	487
Restructured, not on non-accrual	0	0
Impaired Financing Receivable, Related Allowance	219	71
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	219	71
Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Recorded Investment	435	136
Non-accrual	435	136
Restructured, not on non-accrual	0	0
Impaired Financing Receivable, Related Allowance	0	0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0
Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Recorded Investment	1,669	1,602
Non-accrual	1,669	1,602
Restructured, not on non-accrual	0	0
Impaired Financing Receivable, Related Allowance	0	0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0
Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Recorded Investment	318	375
Non-accrual	318	375
Restructured, not on non-accrual	0	0
Impaired Financing Receivable, Related Allowance	0	0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 0	$ 0

Loans - Summary of Aging of Rec

Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Gross	$ 4,275,761	$ 4,097,050
Non-Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	5,174	10,828
90 or More Days Past Due	9,585	2,715
Total Past Due	14,759	13,543
Current	4,200,237	4,009,353
Loans and Leases Receivable, Gross	4,214,996	4,022,896
Total	4,216,081	4,024,221
Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	2,180	7,882
90 or More Days Past Due	8,070	1,770
Total Past Due	10,250	9,652
Current	2,027,790	1,909,068
Total	2,038,040	1,918,720
Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,141	934
90 or More Days Past Due	0	0
Total Past Due	1,141	934
Current	818,286	768,341
Total	819,427	769,275
Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	958	0
90 or More Days Past Due	484	0
Total Past Due	1,442	0
Current	591,696	554,589
Total	593,138	554,589
Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	76
90 or More Days Past Due	0	0
Total Past Due	0	76
Current	300,117	303,015
Total	300,117	303,091
Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	895	1,529
90 or More Days Past Due	1,031	945
Total Past Due	1,926	2,474
Current	316,129	338,838
Total	318,055	341,312
Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	407
90 or More Days Past Due	0	0
Total Past Due	0	407
Current	146,219	135,502
Loans and Leases Receivable, Gross	146,219	135,909
Total	$ 147,304	$ 137,234

Loans - Summary of Recorded I40

Loans - Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	$ 4,275,761	$ 4,097,050
Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	4,216,081	4,024,221
Loans and Leases Receivable, Gross	4,214,996	4,022,896
Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	2,038,040	1,918,720
Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	819,427	769,275
Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	593,138	554,589
Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	300,117	303,091
Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	318,055	341,312
Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	147,304	137,234
Loans and Leases Receivable, Gross	146,219	135,909
Pass (1-6) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	3,919,379	3,794,940
Pass (1-6) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	1,853,440	1,769,102
Pass (1-6) | Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	785,920	754,010
Pass (1-6) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	537,740	514,616
Pass (1-6) | Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	289,263	292,766
Pass (1-6) | Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	307,727	329,742
Pass (1-6) | Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	145,289	134,704
Watch (7) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	220,227	152,923
Watch (7) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	128,087	94,002
Watch (7) | Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	28,442	10,840
Watch (7) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	49,926	34,440
Watch (7) | Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	10,301	9,983
Watch (7) | Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	2,859	3,648
Watch (7) | Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	612	10
Substandard (8) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	75,390	75,033
Substandard (8) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	56,513	55,616
Substandard (8) | Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	5,065	4,425
Substandard (8) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	5,472	5,533
Substandard (8) | Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	553	342
Substandard (8) | Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	7,469	7,922
Substandard (8) | Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans, before unearned loan fees	$ 318	$ 1,195

Purchased Credit Impaired ("P41

Purchased Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands	Jun. 30, 2018USD ($)rating	Dec. 31, 2017USD ($)rating
Covered Loans [Line Items]
Recorded Investment PCI Loans	$ 60,765	$ 74,154
Construction and land development
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.02	5.99
Recorded Investment PCI Loans	$ 5,121	$ 5,883
CRE - investor owned
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	7.37	7.36
Recorded Investment PCI Loans	$ 30,539	$ 42,887
CRE - owner occupied
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	7.02	6.48
Recorded Investment PCI Loans	$ 13,269	$ 11,332
Residential real estate
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.05	5.99
Recorded Investment PCI Loans	$ 9,102	$ 10,781
Commercial and industrial
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.47	6.38
Recorded Investment PCI Loans	$ 2,711	$ 3,212
Consumer and other
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	5.20	2.84
Recorded Investment PCI Loans	$ 23	$ 59

Purchased Credit Impaired ("P42

Purchased Credit Impaired ("PCI") Loans - Summary of Aging of Recorded Investment in Past Due PCI Loans by Portfolio Class and Category (Details) - Covered Loans - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	$ 1,607	$ 328
90 or More Days Past Due	1,003	3,962
Total Past Due	2,610	4,290
Current	58,155	69,864
Total	60,765	74,154
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	0
90 or More Days Past Due	0	0
Total Past Due	0	0
Current	2,711	3,212
Total	2,711	3,212
CRE - investor owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	685	0
90 or More Days Past Due	0	3,034
Total Past Due	685	3,034
Current	29,854	39,853
Total	30,539	42,887
CRE - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	735	0
90 or More Days Past Due	728	673
Total Past Due	1,463	673
Current	11,806	10,659
Total	13,269	11,332
Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	149	0
90 or More Days Past Due	0	0
Total Past Due	149	0
Current	4,972	5,883
Total	5,121	5,883
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	37	328
90 or More Days Past Due	275	255
Total Past Due	312	583
Current	8,790	10,198
Total	9,102	10,781
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1	0
90 or More Days Past Due	0	0
Total Past Due	1	0
Current	22	59
Total	$ 23	$ 59

Purchased Credit Impaired ("P43

Purchased Credit Impaired ("PCI") Loans - Rollforward of PCI Loans, Net of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 69,741	$ 33,925
Acquisitions		49,155
Principal reductions and interest payments	(22,667)	(10,781)
Accretion of loan discount	3,400	3,534
Changes in contractual and expected cash flows due to remeasurement	7,928	5,696
Reductions due to disposals		(2,355)
Balance at end of period	58,402	79,174
Contractual Cashflows
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	112,710	66,003
Acquisitions		68,763
Principal reductions and interest payments	(22,667)	(10,781)
Accretion of loan discount	0	0
Changes in contractual and expected cash flows due to remeasurement	3,281	5,641
Reductions due to disposals		(5,070)
Balance at end of period	93,324	124,556
Non-accretable Difference
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	29,005	18,902
Acquisitions		14,296
Principal reductions and interest payments	0	0
Accretion of loan discount	0	0
Changes in contractual and expected cash flows due to remeasurement	(8,771)	(1,383)
Reductions due to disposals		(1,317)
Balance at end of period	20,234	30,498
Accretable Yield
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	13,964	13,176
Acquisitions		5,312
Principal reductions and interest payments	0	0
Accretion of loan discount	3,400	3,534
Changes in contractual and expected cash flows due to remeasurement	4,124	1,328
Reductions due to disposals		(1,398)
Balance at end of period	$ 14,688	$ 14,884

Purchased Credit Impaired ("P44

Purchased Credit Impaired ("PCI") Loans - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
PCI loans outstanding	$ 81.1	$ 94.9

Commitments (Details)

Commitments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Schedule of Commitments [Line Items]
Unadvanced commitments on impaired loans		$ 0
Commitments to extend credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	$ 1,272,570	1,298,423
Letters of credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	$ 54,647	73,790
Letters of credit | Maximum
Schedule of Commitments [Line Items]
Remaining term	3 years 6 months
Letters of credit | Minimum
Schedule of Commitments [Line Items]
Remaining term	1 month
Unadvanced Commitment on Impaired Loan
Schedule of Commitments [Line Items]
Estimated losses attributable to unadvanced commitments on impaired loans	$ 400	350
Fixed Rate Loan Commitment | Commitments to extend credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	$ 103,400	$ 112,000

Derivative Financial Instrume46

Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Risk Management [Member]
Summary of Derivative Instruments [Abstract]
Notional Amount	$ 0	$ 0
Derivative, Fair Value, Net	0	0
Non-designated hedging instruments | Client-Related | Interest rate swap contracts
Summary of Derivative Instruments [Abstract]
Notional Amount	404,643	394,852
Non-designated hedging instruments | Client-Related | Foreign Exchange Forward [Member]
Summary of Derivative Instruments [Abstract]
Notional Amount	1,342	1,528
Non-designated hedging instruments | Client-Related | Other Assets | Interest rate swap contracts
Summary of Derivative Instruments [Abstract]
Asset derivatives (other assets), fair value	4,016	2,061
Non-designated hedging instruments | Client-Related | Other Assets | Foreign Exchange Forward [Member]
Summary of Derivative Instruments [Abstract]
Asset derivatives (other assets), fair value	1,342	1,528
Non-designated hedging instruments | Client-Related | Other Liabilities | Interest rate swap contracts
Summary of Derivative Instruments [Abstract]
Liability derivatives (other liabilities), fair value	4,016	2,061
Non-designated hedging instruments | Client-Related | Other Liabilities | Foreign Exchange Forward [Member]
Summary of Derivative Instruments [Abstract]
Liability derivatives (other liabilities), fair value	$ 1,342	$ 1,528

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Securities available for sale	$ 651,140	$ 641,382
State tax credits held for sale	299	400
Portion at Other than Fair Value, Fair Value Disclosure
Assets
State tax credits held for sale	46,200
Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	651,140	641,382
State tax credits held for sale	45,069	44,271
Derivative financial instruments	5,358	3,589
Liabilities
Derivative financial instruments	5,358	3,589
Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	98,044	99,224
Obligations of states and political subdivisions
Assets
Securities available for sale	31,944	34,642
Residential mortgage-backed securities
Assets
Securities available for sale	511,289	507,516
US Treasury Bill Securities [Member]
Assets
Securities available for sale	9,863
Recurring basis | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	651,140	641,382
State tax credits held for sale	299	400
Other Investments	179
Derivative financial instruments	5,358	3,589
Total assets	656,976	645,371
Liabilities
Derivative financial instruments		3,589
Total liabilities	5,358	3,589
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	98,044	99,224
Recurring basis | Obligations of states and political subdivisions | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	31,944	34,642
Recurring basis | Residential mortgage-backed securities | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	511,289	507,516
Recurring basis | US Treasury Bill Securities [Member] | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	9,863
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
State tax credits held for sale	0	0
Other Investments	179
Derivative financial instruments	0	0
Total assets	179	0
Liabilities
Derivative financial instruments	0	0
Total liabilities	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of states and political subdivisions
Assets
Securities available for sale	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential mortgage-backed securities
Assets
Securities available for sale	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Bill Securities [Member]
Assets
Securities available for sale	0
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	651,140	641,382
State tax credits held for sale	0	0
Other Investments	0
Derivative financial instruments	5,358	3,589
Total assets	656,498	644,971
Liabilities
Derivative financial instruments	5,358	3,589
Total liabilities	5,358	3,589
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	98,044	99,224
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions
Assets
Securities available for sale	31,944	34,642
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
Assets
Securities available for sale	511,289	507,516
Recurring basis | Significant Other Observable Inputs (Level 2) | US Treasury Bill Securities [Member]
Assets
Securities available for sale	9,863
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	0	0
State tax credits held for sale	299	400
Other Investments	0
Derivative financial instruments	0	0
Total assets	299	400
Liabilities
Derivative financial instruments	0	0
Total liabilities	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions
Assets
Securities available for sale	0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities
Assets
Securities available for sale	0	$ 0
Recurring basis | Significant Unobservable Inputs (Level 3) | US Treasury Bill Securities [Member]
Assets
Securities available for sale	$ 0

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State tax credits, held for sale	$ 46,481	$ 43,468
State Tax Credits Held For Sale, Fair Value Disclosure	$ 299	400
State Tax Credit Term	10 years
Receivables, Fair Value Disclosure	$ 2,400
Impaired Financing Receivable, Related Allowance	900
Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State tax credits, held for sale	46,500
Recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State Tax Credits Held For Sale, Fair Value Disclosure	299	400
Portion at Other than Fair Value, Fair Value Disclosure
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State Tax Credits Held For Sale, Fair Value Disclosure	46,200
Estimated fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State Tax Credits Held For Sale, Fair Value Disclosure	45,069	44,271
Estimated fair value | Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State Tax Credits Held For Sale, Fair Value Disclosure	$ 299	$ 400

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - Level 3 - Recurring basis - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Securities available for sale, at fair value
Level 3 Financial Instruments Measured at Fair Value
Beginning balance	$ 0	$ 3,093	$ 0	$ 3,089
Total gains:
Included in other comprehensive income	0	0	0	4
Purchases, sales, issuances and settlements:
Purchases	0	0	0	0
Transfer in and/or out of Level 3	0	(3,093)	0	(3,093)
Ending balance	0	0	0	0
Change in unrealized gains relating to assets still held at the reporting date	0	0	0	0
State tax credits held for sale, at fair value
Level 3 Financial Instruments Measured at Fair Value
Beginning balance	350	1,458	400	3,585
Total gains:
Total gains:	3	9	6	49
Purchases, sales, issuances and settlements:
Sales	(54)	(193)	(107)	(2,360)
Ending balance	299	1,274	299	1,274
Change in unrealized gains relating to assets still held at the reporting date	$ (13)	$ (49)	$ (26)	$ (655)

Fair Value Measurements - Sum50

Fair Value Measurements - Summary of Financial Instruments and Non-Financial Assets Measured at Fair Value on a Non-Recurring Basis (Details) - Fair Value, Measurements, Nonrecurring $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018USD ($)	Jun. 30, 2018USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total (losses) gains for the year	$ 901	$ 1,653
Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total (losses) gains for the year	900	1,609
Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total (losses) gains for the year	1	44
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0	0
Significant Other Observable Inputs (Level 2) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Significant Other Observable Inputs (Level 2) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	1,940	1,940
Significant Unobservable Inputs (Level 3) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	1,486	1,486
Significant Unobservable Inputs (Level 3) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	454	454
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	1,940	1,940
Estimate of Fair Value Measurement [Member] | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	1,486	1,486
Estimate of Fair Value Measurement [Member] | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	$ 454	$ 454

Fair Value Measurements - Sum51

Fair Value Measurements - Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Balance sheet assets
Securities available for sale	$ 651,140	$ 641,382
Securities held to maturity	68,931	73,749
State tax credits held for sale	299	400
Carrying Amount
Balance sheet assets
Cash and due from banks	91,851	91,084
Federal funds sold	1,445	1,223
Interest-bearing deposits	86,141	63,661
Securities available for sale	651,140	641,382
Securities held to maturity	68,931	73,749
Other investments, at cost	36,132	26,661
Loans held for sale	1,388	3,155
Derivative financial instruments	5,358	3,589
Portfolio loans, net	4,231,391	4,054,473
State tax credits held for sale	46,481	43,468
Accrued interest receivable	17,808	14,069
Balance sheet liabilities
Deposits	4,247,912	4,156,414
Subordinated debentures and notes	118,131	118,105
Federal Home Loan Bank advances	361,534	172,743
Other borrowings	167,216	253,674
Derivative financial instruments	5,358	3,589
Accrued interest payable	1,884	1,730
Estimated fair value
Balance sheet assets
Cash and due from banks	91,851	91,084
Federal funds sold	1,445	1,223
Interest-bearing deposits	86,141	63,661
Securities available for sale	651,140	641,382
Securities held to maturity	66,909	73,458
Other investments, at cost	36,132	26,661
Loans held for sale	1,388	3,155
Derivative financial instruments	5,358	3,589
Portfolio loans, net	4,252,679	4,096,741
State tax credits held for sale	45,069	44,271
Accrued interest receivable	17,808	14,069
Balance sheet liabilities
Deposits	4,242,061	4,153,323
Subordinated debentures and notes	105,889	105,031
Federal Home Loan Bank advances	361,531	172,893
Other borrowings	167,086	253,530
Derivative financial instruments	5,358	3,589
Accrued interest payable	$ 1,884	$ 1,730

Fair Value Measurements - Sch52

Fair Value Measurements - Schedule of Estimated Fair Values of Financial Instruments Not Recorded at Fair Value on Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Estimated fair value | Securities held to maturity
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	$ 66,909	$ 73,458
Estimated fair value | Portfolio loans, net
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	4,252,679	4,096,741
Estimated fair value | State tax credits, held for sale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	44,770	43,871
Estimated fair value | Deposits
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	4,242,061	4,153,323
Estimated fair value | Subordinated debentures and notes
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	105,889	105,031
Estimated fair value | Federal Home Loan Bank advances
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	361,531	172,893
Estimated fair value | Other Borrowings
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	167,086	253,530
Level 1 | Securities held to maturity
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	0	0
Level 1 | Portfolio loans, net
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	0	0
Level 1 | State tax credits, held for sale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	0	0
Level 1 | Deposits
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	3,574,581	3,577,641
Level 1 | Subordinated debentures and notes
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	0	0
Level 1 | Federal Home Loan Bank advances
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	0	0
Level 1 | Other Borrowings
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	0	0
Level 2 | Securities held to maturity
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	66,909	73,458
Level 2 | Portfolio loans, net
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	0	0
Level 2 | State tax credits, held for sale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	0	0
Level 2 | Deposits
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	0	0
Level 2 | Subordinated debentures and notes
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	105,889	105,031
Level 2 | Federal Home Loan Bank advances
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	361,531	172,893
Level 2 | Other Borrowings
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	167,086	253,530
Level 3 | Securities held to maturity
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	0	0
Level 3 | Portfolio loans, net
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	4,252,679	4,096,741
Level 3 | State tax credits, held for sale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial assets not on condensed consolidated balance sheets at fair value	44,770	43,871
Level 3 | Deposits
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	667,480	575,682
Level 3 | Subordinated debentures and notes
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	0	0
Level 3 | Federal Home Loan Bank advances
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	0	0
Level 3 | Other Borrowings
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	$ 0	$ 0