Enterprise Financial Services (EFSC) 10-Q 25 Oct 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 19, 2016
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	Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		20,011,401

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 56,789	$ 47,935
Federal funds sold	488	91
Interest-bearing deposits (including $1,870 and $1,320 pledged as collateral)	61,222	46,131
Total cash and cash equivalents	118,499	94,157
Interest-bearing deposits greater than 90 days	1,980	1,000
Securities available for sale	479,609	451,770
Securities held to maturity	41,031	43,714
Loans held for sale	7,663	6,598
Portfolio loans	3,037,705	2,750,737
Less: Allowance for loan losses	37,498	33,441
Portfolio loans, net	3,000,207	2,717,296
Purchased credit impaired loans, net of the allowance for loan losses ($8,551 and $10,175, respectively)	41,016	64,583
Total loans, net	3,041,223	2,781,879
Other real estate	2,959	8,366
Other investments, at cost	19,789	17,455
Fixed assets, net	14,498	14,842
Accrued interest receivable	8,526	8,399
State tax credits held for sale, including $4,774 and $5,941 carried at fair value, respectively	44,180	45,850
Goodwill	30,334	30,334
Intangible assets, net	2,357	3,075
Other assets	96,996	101,044
Total assets	3,909,644	3,608,483
Liabilities and Shareholders' Equity
Demand deposits	762,155	717,460
Interest-bearing transaction accounts	633,100	564,420
Money market accounts	1,131,997	1,053,662
Savings	109,728	92,861
Certificates of deposit:
Brokered	137,592	39,573
Other	350,253	316,615
Total deposits	3,124,825	2,784,591
Subordinated debentures	56,807	56,807
Federal Home Loan Bank advances	129,000	110,000
Other borrowings	190,022	270,326
Accrued interest payable	648	629
Other liabilities	27,244	35,301
Total liabilities	3,528,546	3,257,654
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; 20,234,235 and 20,093,119 shares issued, respectively	203	201
Treasury stock, at cost; 255,018 and 76,000 shares, respectively	(6,632)	(1,743)
Additional paid in capital	212,091	210,589
Retained earnings	170,768	141,564
Accumulated other comprehensive income	4,668	218
Total shareholders' equity	381,098	350,829
Total liabilities and shareholders' equity	$ 3,909,644	$ 3,608,483

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets
Collateral pledged	$ 1,870	$ 1,320
Allowance for loan losses on Portfolio loans, covered under FDIC loss share	6,433	10,175
State tax credits, held for sale, carried at fair value	$ 4,801	$ 5,941
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	20,249,711	20,093,119
Treasury stock, shares	261,718	76,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest income:
Interest and fees on loans	$ 34,442	$ 30,626	$ 101,233	$ 90,109
Interest on debt securities:
Taxable	2,410	2,176	7,194	6,434
Nontaxable	322	298	982	880
Interest on interest-bearing deposits	67	68	186	153
Dividends on equity securities	52	12	191	107
Total interest income	37,293	33,180	109,786	97,683
Interest expense:
Interest-bearing transaction accounts	332	293	967	849
Money market accounts	1,143	822	3,162	2,136
Savings accounts	68	58	191	162
Interest Expense, Time Deposits	1,319	1,543	3,521	4,728
Subordinated debentures	369	314	1,078	924
Federal Home Loan Bank advances	126	9	499	82
Notes payable and other borrowings	106	135	327	471
Total interest expense	3,463	3,174	9,745	9,352
Net interest income	33,830	30,006	100,041	88,331
Provision for portfolio loan losses	3,038	599	4,587	4,329
Provision reversal for purchased credit impaired loan losses	(1,194)	(227)	(1,603)	(3,497)
Net interest income after provision for loan losses	31,986	29,634	97,057	87,499
Noninterest income:
Service charges on deposit accounts	2,200	2,044	6,431	5,898
Wealth management revenue	1,694	1,773	5,000	5,291
Other service charges and fee income	1,007	871	2,827	2,464
Gain on state tax credits, net	228	321	899	1,069
Gain on sale of other real estate	(226)	32	602	61
Gain on sale of investment securities	86	0	86	23
Change in FDIC loss share receivable	0	(1,241)	0	(4,450)
Miscellaneous income	1,987	929	4,185	3,762
Total noninterest income	6,976	4,729	20,030	14,118
Noninterest expense:
Employee compensation and benefits	12,091	11,475	37,398	34,262
Occupancy	1,705	1,605	4,997	4,920
Data processing	1,150	1,138	3,441	3,295
FDIC and other insurance	780	654	2,241	2,045
Professional fees	757	800	2,160	2,626
Loan legal and other real estate expense	416	530	1,126	1,356
FHLB prepayment penalty	0	298	0	760
Other	3,915	3,432	11,566	10,076
Total noninterest expense	20,814	19,932	62,929	59,340
Income before income tax expense	18,148	14,431	54,158	42,277
Income tax expense	6,316	4,722	18,949	14,506
Net income	$ 11,832	$ 9,709	$ 35,209	$ 27,771
Earnings per common share
Basic (usd per share)	$ 0.59	$ 0.49	$ 1.76	$ 1.39
Diluted (usd per share)	$ 0.59	$ 0.48	$ 1.74	$ 1.37

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 11,832	$ 9,709	$ 35,209	$ 27,771
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 $986 and $(1,322), and for six months of $3,290 and $(277), respectively	(796)	1,724	4,503	1,306
Less: Reclassification adjustment for realized gains on sale of securities available for sale included in net income, net of income tax expense for three months of $0 and $0, and for six months of $0 and $9, respectively	(53)	0	(53)	(14)
Total other comprehensive income (loss)	(849)	1,724	4,450	1,292
Total comprehensive income	$ 10,983	$ 11,433	$ 39,659	$ 29,063

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other comprehensive income, tax:
Unrealized (loss)/gain on investment securities available for sale arising during the period, tax	$ (494)	$ 1,070	$ 2,795	$ 793
Reclassification adjustment for realized gains on sale of securities available for sale included in net income, tax	$ 33	$ 0	$ 33	$ 9

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Treasury Stock	Additional paid in capital	Retained earnings	Accumulated other comprehensive income (loss)
Balance at Dec. 31, 2014	$ 316,241	$ 0	$ 199	$ (1,743)	$ 207,731	$ 108,373	$ 1,681
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,771	0	0	0	0	27,771	0
Other comprehensive income	1,292	0	0	0	0	0	1,292
Cash dividends paid on common shares	(3,654)	0	0	0	0	3,654	0
Issuance under equity compensation plans, net	(831)	0	(1)	0	832	0	0
Share-based Compensation	2,588	0	0	0	2,588	0	0
Excess tax benefit related to equity compensation plans	156	0	0	0	156	0	0
Balance at Sep. 30, 2015	343,563	0	200	(1,743)	209,643	132,490	2,973
Balance at Dec. 31, 2015	350,829	0	201	(1,743)	210,589	141,564	218
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	35,209	0	0	0	0	35,209	0
Other comprehensive income	4,450	0	0	0	0	0	4,450
Cash dividends paid on common shares	(6,005)	0	0	0	0	6,005	0
Adjustments To Additional Paid In Capital, Repurchase Of Common Stock Warrants	(4,889)	0	0	(4,889)	0	0	0
Issuance under equity compensation plans, net	(1,650)	0	(2)	0	1,652	0	0
Share-based Compensation	2,410	0	0	0	2,410	0	0
Excess tax benefit related to equity compensation plans	744	0	0	0	744	0	0
Balance at Sep. 30, 2016	$ 381,098	$ 0	$ 203	$ (6,632)	$ 212,091	$ 170,768	$ 4,668

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash dividends paid on common shares, per share	$ 0.30	$ 0.183
Issuance under equity compensation plans, shares	156,592	121,646
Stock Issued During Period, Shares, Conversion of Convertible Securities	0	0

Condensed Consolidated Stateme9

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 35,209	$ 27,771
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	1,628	1,510
Provision for loan losses	2,984	832
Deferred income taxes	3,881	1,937
Net amortization of debt securities	2,350	2,473
Amortization of intangible assets	718	842
Gain on sale of investment securities	(86)	(23)
Mortgage loans originated for sale	(117,975)	(95,744)
Proceeds from mortgage loans sold	117,639	95,814
Gain on sale of other real estate	(602)	(61)
Gain on state tax credits, net	(899)	(1,069)
Excess tax benefit of share-based compensation	(744)	(156)
Share-based Compensation	2,410	2,588
Valuation adjustment on other real estate	1	82
Net accretion of loan discount and indemnification asset	(8,165)	(4,894)
Changes in:
Accrued interest receivable	(127)	(703)
Accrued interest payable	19	(63)
Other assets	(2,101)	4,851
Other liabilities	(8,057)	4,024
Net cash provided by (used in) operating activities	28,083	40,011
Cash flows from investing activities:
Net decrease (increase) in loans	(256,706)	(152,970)
Net cash proceeds received from FDIC loss share receivable	0	1,725
Proceeds from the sale of securities, available for sale	2,493	41,069
Proceeds from the paydown or maturity of securities, available for sale	46,017	40,230
Proceeds from the paydown or maturity of securities, held to maturity	2,592	1,848
Proceeds from the redemption of other investments	44,968	29,362
Proceeds from the sale of state tax credits held for sale	4,918	5,353
Proceeds from the sale of other real estate	8,072	5,662
Payments for the purchase/origination of:
Available for sale debt and equity securities	(71,309)	(150,934)
Other investments	(48,283)	(23,931)
State tax credits held for sale	(2,349)	(14,004)
Fixed assets	(1,284)	(1,152)
Net cash provided by (used in) investing activities	(270,871)	(217,742)
Cash flows from financing activities:
Net increase in noninterest-bearing deposit accounts	44,695	48,828
Net increase in interest-bearing deposit accounts	295,539	273,625
Proceeds from Federal Home Loan Bank advances	1,309,000	635,900
Repayments of Federal Home Loan Bank advances	(1,290,000)	(704,900)
Repayments of notes payable	0	(900)
Net decrease in other borrowings	(80,304)	(44,299)
Dividends, Common Stock, Cash	(6,005)	(3,654)
Excess tax benefit of share-based compensation	744	156
Payments for Repurchase of Common Stock	4,889	0
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures	1,650	831
Net cash provided by (used in) financing activities	267,130	203,925
Net increase (decrease) in cash and cash equivalents	24,342	26,194
Cash and cash equivalents, beginning of period	94,157	100,696
Cash and cash equivalents, end of period	118,499	126,890
Supplemental Cash Flow Information [Abstract]
Cash paid during the period for interest	9,726	9,415
Cash paid during the period for income taxes	19,868	8,763
Noncash transactions:
Transfer to other real estate owned in settlement of loans	2,683	6,604
Sales of other real estate financed	$ 140	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2016
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 nine months ended September 30, 2016 are not necessarily indicative of the results that may be expected for any other interim period or for the year ending December 31, 2016 . 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, 2015 . 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. In 2016, the Company changed its presentation of certificates of deposit on the Condensed Consolidated Balance Sheets to separate brokered deposit sources from other sources. The corresponding prior period balances were reclassified to conform to the current year presentation. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2016
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 September 30, Nine months ended September 30, (in thousands, except per share data) 2016 2015 2016 2015 Net income as reported $ 11,832 $ 9,709 $ 35,209 $ 27,771 Weighted average common shares outstanding 19,997 19,995 20,002 19,970 Additional dilutive common stock equivalents 227 266 229 266 Weighted average diluted common shares outstanding 20,224 20,261 20,231 20,236 Basic earnings per common share: $ 0.59 $ 0.49 $ 1.76 $ 1.39 Diluted earnings per common share: $ 0.59 $ 0.48 $ 1.74 $ 1.37 For the three and nine months ended September 30, 2016 and 2015 , the amount of common stock equivalents excluded from the earnings per share calculations because their effect was anti-dilutive was zero , and 0.1 million common stock equivalents, respectively.

Investments

Investments	9 Months Ended
	Sep. 30, 2016
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: September 30, 2016 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 97,745 $ 1,313 $ — $ 99,058 Obligations of states and political subdivisions 37,132 1,511 (307 ) 38,336 Agency mortgage-backed securities 336,693 5,826 (304 ) 342,215 Total securities available for sale $ 471,570 $ 8,650 $ (611 ) $ 479,609 Held to maturity securities: Obligations of states and political subdivisions $ 14,777 $ 359 $ (2 ) $ 15,134 Agency mortgage-backed securities 26,254 830 — 27,084 Total securities held to maturity $ 41,031 $ 1,189 $ (2 ) $ 42,218 December 31, 2015 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 98,699 $ 309 $ — $ 99,008 Obligations of states and political subdivisions 40,700 1,343 (342 ) 41,701 Agency mortgage-backed securities 311,516 2,046 (2,501 ) 311,061 Total securities available for sale $ 450,915 $ 3,698 $ (2,843 ) $ 451,770 Held to maturity securities: Obligations of states and political subdivisions $ 14,831 $ 63 $ (50 ) $ 14,844 Agency mortgage-backed securities 28,883 — (286 ) 28,597 Total securities held to maturity $ 43,714 $ 63 $ (336 ) $ 43,441 At September 30, 2016 , and December 31, 2015 , 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-sponsored enterprises. Available for sale securities having a fair value of $321.5 million and $334.4 million at September 30, 2016 , and December 31, 2015 , 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 September 30, 2016 , 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 4 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 $ 52,384 $ 52,637 $ — $ — Due after one year through five years 70,128 72,153 8,189 8,356 Due after five years through ten years 8,836 9,328 6,588 6,778 Due after ten years 3,529 3,276 — — Agency mortgage-backed securities 336,693 342,215 26,254 27,084 $ 471,570 $ 479,609 $ 41,031 $ 42,218 The following table represents a summary of investment securities that had an unrealized loss: September 30, 2016 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 states and political subdivisions $ — $ — $ 3,566 $ 309 $ 3,566 $ 309 Agency mortgage-backed securities 6,654 11 13,379 293 20,033 304 $ 6,654 $ 11 $ 16,945 $ 602 $ 23,599 $ 613 December 31, 2015 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 states and political subdivisions $ 2,199 $ 12 $ 9,395 $ 380 $ 11,594 $ 392 Agency mortgage-backed securities 189,229 2,050 21,020 737 210,249 2,787 $ 191,428 $ 2,062 $ 30,415 $ 1,117 $ 221,843 $ 3,179 The unrealized losses at both September 30, 2016 , and December 31, 2015 , 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 September 30, 2016 , management performed its quarterly analysis of all securities with an unrealized loss and concluded no individual securities were other-than-temporarily impaired. The gross gains and gross losses realized from sales of available for sale investment securities were as follows: Three months ended September 30, Nine months ended September 30, (in thousands) 2016 2015 2016 2015 Gross gains realized $ 86 $ — $ 86 $ 63 Gross losses realized — — — (40 ) Proceeds from sales 2,493 — 2,493 41,069

Portfolio Loans

Portfolio Loans	9 Months Ended
	Sep. 30, 2016
Receivables [Abstract]
Portfolio Loans	PORTFOLIO LOANS Below is a summary of Portfolio loans by category at September 30, 2016 and December 31, 2015 : (in thousands) September 30, 2016 December 31, 2015 Commercial and industrial $ 1,598,815 $ 1,484,327 Real estate: Commercial - investor owned 515,055 428,064 Commercial - owner occupied 340,916 342,959 Construction and land development 188,856 161,061 Residential 233,960 196,498 Total real estate loans 1,278,787 1,128,582 Consumer and other 160,535 137,537 Portfolio loans 3,038,137 2,750,446 Unearned loan fees, net (432 ) 291 Portfolio loans, including unearned loan fees $ 3,037,705 $ 2,750,737 A summary of the activity in the allowance for loan losses and the recorded investment in Portfolio loans by class and category based on impairment method through September 30, 2016 , and at December 31, 2015 , 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, 2015 $ 22,056 $ 3,484 $ 2,969 $ 1,704 $ 1,796 $ 1,432 $ 33,441 Provision (provision reversal) for loan losses 1,120 (116 ) 80 (65 ) 11 (197 ) 833 Losses charged off (68 ) — — — — (5 ) (73 ) Recoveries 53 7 68 6 34 4 172 Balance at March 31, 2016 $ 23,161 $ 3,375 $ 3,117 $ 1,645 $ 1,841 $ 1,234 $ 34,373 Provision (provision reversal) for loan losses 302 (27 ) (541 ) (434 ) (80 ) 1,496 716 Losses charged off (157 ) — — — — (6 ) (163 ) Recoveries 502 8 15 8 36 3 572 Balance at June 30, 2016 $ 23,808 $ 3,356 $ 2,591 $ 1,219 $ 1,797 $ 2,727 $ 35,498 Provision (provision reversal) for loan losses 3,575 10 94 (730 ) 168 (79 ) 3,038 Losses charged off (2,044 ) — — — (25 ) (4 ) (2,073 ) Recoveries 69 8 17 913 26 2 1,035 Balance at September 30, 2016 $ 25,408 $ 3,374 $ 2,702 $ 1,402 $ 1,966 $ 2,646 $ 37,498 (in thousands) Commercial and industrial CRE - investor owned CRE - owner occupied Construction and land development Residential real estate Consumer and other Total Balance September 30, 2016 Allowance for loan losses - Ending balance: Individually evaluated for impairment $ 3,785 $ — $ — $ 158 $ 3 $ 1,855 $ 5,801 Collectively evaluated for impairment 21,623 3,374 2,702 1,244 1,963 791 31,697 Total $ 25,408 $ 3,374 $ 2,702 $ 1,402 $ 1,966 $ 2,646 $ 37,498 Loans - Ending balance: Individually evaluated for impairment $ 13,414 $ 252 $ 1,666 $ 1,907 $ 124 $ 4,499 $ 21,862 Collectively evaluated for impairment 1,585,401 514,803 339,250 186,949 233,836 155,604 3,015,843 Total $ 1,598,815 $ 515,055 $ 340,916 $ 188,856 $ 233,960 $ 160,103 $ 3,037,705 Balance December 31, 2015 Allowance for loan losses - Ending balance: Individually evaluated for impairment $ 1,953 $ — $ 6 $ 369 $ 7 $ — $ 2,335 Collectively evaluated for impairment 20,103 3,484 2,963 1,335 1,789 1,432 31,106 Total $ 22,056 $ 3,484 $ 2,969 $ 1,704 $ 1,796 $ 1,432 $ 33,441 Loans - Ending balance: Individually evaluated for impairment $ 4,514 $ 921 $ 1,962 $ 2,800 $ 681 $ — $ 10,878 Collectively evaluated for impairment 1,479,813 427,143 340,997 158,261 195,817 137,828 2,739,859 Total $ 1,484,327 $ 428,064 $ 342,959 $ 161,061 $ 196,498 $ 137,828 $ 2,750,737 A summary of Portfolio loans individually evaluated for impairment by category at September 30, 2016 and December 31, 2015 , is as follows: September 30, 2016 (in thousands) Unpaid Recorded Recorded Allowance Total Related Allowance Average Commercial and industrial $ 14,895 $ 136 $ 13,134 $ 13,270 $ 3,785 $ 15,666 Real estate loans: Commercial - investor owned 252 253 — 253 — 250 Commercial - owner occupied — — — — — — Construction and land development 1,907 1,920 358 2,278 158 2,403 Residential 149 65 64 129 3 652 Consumer and other 4,499 — 4,508 4,508 1,855 4,598 Total $ 21,702 $ 2,374 $ 18,064 $ 20,438 $ 5,801 $ 23,569 December 31, 2015 (in thousands) Unpaid Recorded Recorded Allowance Total Related Allowance Average Commercial and industrial $ 5,554 $ 509 $ 4,204 $ 4,713 $ 1,953 $ 6,970 Real estate loans: Commercial - investor owned 927 927 — 927 — 970 Commercial - owner occupied 329 85 113 198 6 301 Construction and land development 4,349 2,914 530 3,444 369 3,001 Residential 705 637 68 705 7 682 Consumer and other — — — — — — Total $ 11,864 $ 5,072 $ 4,915 $ 9,987 $ 2,335 $ 11,924 The following table presents details for past due and impaired loans: Three months ended September 30, Nine months ended September 30, (in thousands) 2016 2015 2016 2015 Total interest income that would have been recognized under original terms $ 226 $ 369 $ 703 $ 913 Total cash received and recognized as interest income on non-accrual loans 203 81 253 206 Total interest income recognized on impaired loans 32 4 63 31 There were no loans over 90 days past due and still accruing interest at September 30, 2016 or December 31, 2015 . The recorded investment in impaired Portfolio loans by category at September 30, 2016 and December 31, 2015 , is as follows: September 30, 2016 (in thousands) Non-accrual Restructured Loans over 90 days past due and still accruing interest Total Commercial and industrial $ 10,959 $ 2,311 $ — $ 13,270 Real estate: Commercial - investor owned 253 — — 253 Commercial - owner occupied — — — — Construction and land development 2,258 20 — 2,278 Residential 129 — — 129 Consumer and other 4,508 — — 4,508 Total $ 18,107 $ 2,331 $ — $ 20,438 December 31, 2015 (in thousands) Non-accrual Restructured Loans over 90 days past due and still accruing interest Total Commercial and industrial $ 4,406 $ 307 $ — $ 4,713 Real estate: Commercial - investor owned 927 — — 927 Commercial - owner occupied 198 — — 198 Construction and land development 3,444 — — 3,444 Residential 705 — — 705 Consumer and other — — — — Total $ 9,680 $ 307 $ — $ 9,987 The recorded investment by category for the Portfolio loans that have been restructured during the three and nine months ended September 30, 2016 and 2015 , is as follows: Three months ended September 30, 2016 Three months ended September 30, 2015 (in thousands, except for number of loans) Number of Loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Number of Loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Commercial and industrial — $ — $ — — $ — $ — Real estate: Commercial - investor owned — — — — — — Commercial - owner occupied — — — — — — Construction and land development — — — — — — Residential — — — — — — Consumer and other — — — — — — Total — $ — $ — — $ — $ — Nine months ended September 30, 2016 Nine months ended September 30, 2015 (in thousands, except for number of loans) Number of Loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Number of Loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Commercial and industrial 2 $ 2,341 $ 2,341 — $ — $ — Real estate: Commercial - investor owned 1 248 248 — — — Commercial - owner occupied — — — — — — Construction and land development 1 20 20 — — — Residential — — — — — — Consumer and other — — — — — — Total 4 $ 2,609 $ 2,609 — $ — $ — The restructured loans resulted from deferral of principal and extending the term to maturity. As of September 30, 2016 , the Company had $1.2 million specific reserves allocated to loans that have been restructured. There were no Portfolio loans restructured that subsequently defaulted during the three and nine months ended September 30, 2016 or 2015 . The aging of the recorded investment in past due Portfolio loans by portfolio class and category at September 30, 2016 and December 31, 2015 is shown below. September 30, 2016 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ — $ 364 $ 364 $ 1,598,451 $ 1,598,815 Real estate: Commercial - investor owned 136 — 136 514,919 515,055 Commercial - owner occupied 225 — 225 340,691 340,916 Construction and land development — 1,529 1,529 187,327 188,856 Residential 73 60 133 233,827 233,960 Consumer and other — — — 160,103 160,103 Total $ 434 $ 1,953 $ 2,387 $ 3,035,318 $ 3,037,705 December 31, 2015 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ 505 $ 888 $ 1,393 $ 1,482,934 $ 1,484,327 Real estate: Commercial - investor owned 464 — 464 427,600 428,064 Commercial - owner occupied 94 184 278 342,681 342,959 Construction and land development 384 2,273 2,657 158,404 161,061 Residential 70 681 751 195,747 196,498 Consumer and other 20 — 20 137,808 137,828 Total $ 1,537 $ 4,026 $ 5,563 $ 2,745,174 $ 2,750,737 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 Portfolio loans by portfolio class and category at September 30, 2016 , which is based upon the most recent analysis performed, and December 31, 2015 is as follows: September 30, 2016 (in thousands) Pass (1-6) Watch (7) Substandard (8) Doubtful (9) Total Commercial and industrial $ 1,457,729 $ 63,572 $ 77,514 $ — $ 1,598,815 Real estate: Commercial - investor owned 501,228 9,549 4,278 — 515,055 Commercial - owner occupied 311,427 25,369 4,120 — 340,916 Construction and land development 179,515 6,050 3,291 — 188,856 Residential 226,287 4,224 3,449 — 233,960 Consumer and other 153,458 711 5,934 — 160,103 Total $ 2,829,644 $ 109,475 $ 98,586 $ — $ 3,037,705 December 31, 2015 (in thousands) Pass (1-6) Watch (7) Substandard (8) Doubtful (9) Total Commercial and industrial $ 1,356,864 $ 90,370 $ 37,093 $ — $ 1,484,327 Real estate: Commercial - investor owned 403,820 18,868 5,376 — 428,064 Commercial - owner occupied 314,791 24,727 3,441 — 342,959 Construction and land development 146,601 10,114 4,346 — 161,061 Residential 188,269 5,138 3,091 — 196,498 Consumer and other 131,060 721 6,047 — 137,828 Total $ 2,541,405 $ 149,938 $ 59,394 $ — $ 2,750,737

Purchased Credit Impaired ("PCI

Purchased Credit Impaired ("PCI") Loans	9 Months Ended
	Sep. 30, 2016
Receivables [Abstract]
Purchase Credit Impaired (PCI) Loans	PURCHASED CREDIT IMPAIRED ("PCI") LOANS Below is a summary of PCI loans by category at September 30, 2016 and December 31, 2015 : September 30, 2016 December 31, 2015 (in thousands) Weighted- Average Risk Rating 1 Recorded Investment PCI Loans Weighted- Average Risk Rating 1 Recorded Investment PCI Loans Commercial and industrial 5.84 $ 3,282 6.70 $ 3,863 Real estate: Commercial - investor owned 6.94 14,595 6.98 25,272 Commercial - owner occupied 6.34 12,417 6.30 19,414 Construction and land development 5.67 4,919 6.28 6,838 Residential 5.66 12,173 5.44 19,287 Total real estate loans 44,104 70,811 Consumer and other 1.54 63 1.89 84 Purchased credit impaired loans $ 47,449 $ 74,758 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 September 30, 2016 and December 31, 2015 is shown below: September 30, 2016 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ 805 $ — $ 805 $ 2,477 $ 3,282 Real estate: Commercial - investor owned — — — 14,595 14,595 Commercial - owner occupied 229 — 229 12,188 12,417 Construction and land development — — — 4,919 4,919 Residential 84 55 139 12,034 12,173 Consumer and other — — — 63 63 Total $ 1,118 $ 55 $ 1,173 $ 46,276 $ 47,449 December 31, 2015 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ — $ — $ — $ 3,863 $ 3,863 Real estate: Commercial - investor owned 2,342 3,661 6,003 19,269 25,272 Commercial - owner occupied 731 — 731 18,683 19,414 Construction and land development — — — 6,838 6,838 Residential 1,594 130 1,724 17,563 19,287 Consumer and other 4 — 4 80 84 Total $ 4,671 $ 3,791 $ 8,462 $ 66,296 $ 74,758 The following table is a rollforward of PCI loans, net of the allowance for loan losses, for the nine months ended September 30, 2016 and 2015 . (in thousands) Contractual Cashflows Non-accretable Difference Accretable Yield Carrying Amount Balance January 1, 2016 $ 116,689 $ 26,765 $ 25,341 $ 64,583 Principal reductions and interest payments (20,417 ) — — (20,417 ) Accretion of loan discount — — (4,984 ) 4,984 Changes in contractual and expected cash flows due to remeasurement 9,194 975 (1,043 ) 9,262 Reductions due to disposals (27,888 ) (6,779 ) (3,713 ) (17,396 ) Balance September 30, 2016 $ 77,578 $ 20,961 $ 15,601 $ 41,016 Balance January 1, 2015 $ 178,145 $ 65,719 $ 28,733 $ 83,693 Principal reductions and interest payments (19,315 ) — — (19,315 ) Accretion of loan discount — — (8,604 ) 8,604 Changes in contractual and expected cash flows due to remeasurement (5,731 ) (26,797 ) 9,233 11,833 Reductions due to disposals (19,734 ) (4,183 ) (3,133 ) (12,418 ) Balance September 30, 2015 $ 133,365 $ 34,739 $ 26,229 $ 72,397 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 $64.6 million and $98.6 million as of September 30, 2016 , and December 31, 2015 , respectively.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2016
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. Risk Management Instruments. The Company enters into interest rate caps in order to economically hedge changes in fair value of State tax credits held for sale. See Note 8 – Fair Value Measurements for further discussion on the fair value of state tax credits. The notional amount of the derivative instruments used to manage risk was $3.5 million at September 30, 2016 and December 31, 2015 , and the fair value was zero in both periods. 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) September 30, December 31, September 30, December 31, September 30, December 31, Non-designated hedging instruments Interest rate swap contracts $ 171,792 $ 153,630 $ 2,099 $ 1,155 $ 2,099 $ 1,155 Changes in the fair value of client-related derivative instruments are recognized currently in operations. For the three and nine months ended September 30, 2016 and 2015 , the gains and losses offset each other due to the Company's hedging of the client swaps with other bank counterparties.

Commitments

Commitments	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016 , there were $0.5 million unadvanced commitments on impaired loans. The contractual amounts of off-balance-sheet financial instruments as of September 30, 2016 , and December 31, 2015 , are as follows: (in thousands) September 30, 2016 December 31, 2015 Commitments to extend credit $ 1,086,372 $ 1,140,028 Standby letters of credit 64,360 54,648 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 September 30, 2016 , and December 31, 2015 , approximately $108 million and $94 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 include $0.3 million for estimated losses attributable to the unadvanced commitments at September 30, 2016 and December 31, 2015 . 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. The approximate remaining term of standby letters of credit range from 1 month to 5 years at September 30, 2016 . 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.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016 and December 31, 2015 , segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: September 30, 2016 (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 $ — $ 99,058 $ — $ 99,058 Obligations of states and political subdivisions — 35,242 3,094 38,336 Residential mortgage-backed securities — 342,215 — 342,215 Total securities available for sale $ — $ 476,515 $ 3,094 $ 479,609 State tax credits held for sale — — 4,801 4,801 Derivative financial instruments — 2,099 — 2,099 Total assets $ — $ 478,614 $ 7,895 $ 486,509 Liabilities Derivative financial instruments $ — $ 2,099 $ — $ 2,099 Total liabilities $ — $ 2,099 $ — $ 2,099 December 31, 2015 (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 $ — $ 99,008 $ — $ 99,008 Obligations of states and political subdivisions — 38,624 3,077 41,701 Residential mortgage-backed securities — 311,061 — 311,061 Total securities available for sale $ — $ 448,693 $ 3,077 $ 451,770 State tax credits held for sale — — 5,941 5,941 Derivative financial instruments — 1,155 — 1,155 Total assets $ — $ 449,848 $ 9,018 $ 458,866 Liabilities Derivative financial instruments $ — $ 1,155 $ — $ 1,155 Total liabilities $ — $ 1,155 $ — $ 1,155 • 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. At September 30, 2016 , Level 3 securities available for sale consist primarily of three Auction Rate Securities that are valued based on the securities' estimated cash flows, yields of comparable securities, and live trading levels. • State tax credits held for sale. At September 30, 2016 , of the $44.2 million of state tax credits held for sale on the condensed consolidated balance sheet, approximately $4.8 million were carried at fair value. The remaining $39.4 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 fair value measurement is calculated using an internal valuation model with market data including discounted cash flows based upon the terms and conditions of the tax credits. If the underlying project remains in compliance with the various federal and state rules governing the tax credit program, each project will generate about 10 years of tax credits. The inputs to the discounted cash flow calculation include: the amount of tax credits generated each year, the anticipated sale price of the tax credit, the timing of the sale and a discount rate. The discount rate is estimated using the LIBOR swap curve at a point equal to the remaining life in years of credits plus a 205 basis point spread. With the exception of the discount rate, the other inputs to the fair value calculation are observable and readily available. The discount rate is considered a Level 3 input because it is an “unobservable input” and is based on the Company’s assumptions. An increase in the discount rate utilized would generally result in a lower estimated fair value of the tax credits. Alternatively, a decrease in the discount rate utilized would generally result in a higher estimated fair value of the tax credits. Given the significance of this input to the fair value calculation, 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 and caps. 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. 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 September 30, 2016 and 2015 . • Purchases, sales, issuances and settlements . There were no Level 3 purchases during the quarter ended September 30, 2016 or 2015 . • Transfers in and/or out of Level 3 . There were no Level 3 transfers during the quarter ended September 30, 2016 and 2015 . Securities available for sale, at fair value Three months ended September 30, Nine months ended September 30, (in thousands) 2016 2015 2016 2015 Beginning balance $ 3,093 $ 3,070 $ 3,077 $ 3,059 Total gains: Included in other comprehensive income 1 7 17 18 Purchases, sales, issuances and settlements: Purchases — — — — Ending balance $ 3,094 $ 3,077 $ 3,094 $ 3,077 Change in unrealized gains relating to assets still held at the reporting date $ 1 $ 7 $ 17 $ 18 State tax credits held for sale Three months ended September 30, Nine months ended September 30, (in thousands) 2016 2015 2016 2015 Beginning balance $ 4,774 $ 9,965 $ 5,941 $ 11,689 Total gains: Included in earnings 27 124 144 318 Purchases, sales, issuances and settlements: Sales — — (1,284 ) (1,918 ) Ending balance $ 4,801 $ 10,089 $ 4,801 $ 10,089 Change in unrealized gains (losses) relating to assets still held at the reporting date $ 27 $ 124 $ (237 ) $ (186 ) 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 September 30, 2016 . (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 nine Impaired loans $ 357 $ — $ — $ 357 $ 2,073 $ 2,309 Other real estate — — — — — 1 Total $ 357 $ — $ — $ 357 $ 2,073 $ 2,310 (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. 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. Certain state tax credits are reported at cost. Following is a summary of the carrying amounts and fair values of the Company’s financial instruments on the consolidated balance sheets at September 30, 2016 and December 31, 2015 . September 30, 2016 December 31, 2015 (in thousands) Carrying Amount Estimated fair value Carrying Amount Estimated fair value Balance sheet assets Cash and due from banks $ 56,789 $ 56,789 $ 47,935 $ 47,935 Federal funds sold 488 488 91 91 Interest-bearing deposits 63,202 63,202 47,131 47,131 Securities available for sale 479,609 479,609 451,770 451,770 Securities held to maturity 41,031 42,218 43,714 43,441 Other investments, at cost 19,789 19,789 17,455 17,455 Loans held for sale 7,663 7,663 6,598 6,598 Derivative financial instruments 2,099 2,099 1,155 1,155 Portfolio loans, net 3,041,223 3,045,230 2,781,879 2,782,704 State tax credits, held for sale 44,180 48,959 45,850 49,588 Accrued interest receivable 8,526 8,526 8,399 8,399 Balance sheet liabilities Deposits 3,124,825 3,126,534 2,784,591 2,784,654 Subordinated debentures 56,807 36,275 56,807 35,432 Federal Home Loan Bank advances 129,000 128,996 110,000 109,994 Other borrowings 190,022 189,996 270,326 270,286 Derivative financial instruments 2,099 2,099 1,155 1,155 Accrued interest payable 648 648 629 629 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 19 – Fair Value Measurements in the Company's Annual Report on Form 10 -K for the year ended December 31, 2015 . 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 September 30, 2016 , and December 31, 2015 . Estimated Fair Value Measurement at Reporting Date Using Balance at (in thousands) Level 1 Level 2 Level 3 Financial Assets: Securities held to maturity $ — $ 42,218 $ — $ 42,218 Portfolio loans, net — — 3,045,230 3,045,230 State tax credits, held for sale — — 44,158 44,158 Financial Liabilities: Deposits 2,636,980 — 489,554 3,126,534 Subordinated debentures — 36,275 — 36,275 Federal Home Loan Bank advances — 128,996 — 128,996 Other borrowings — 189,996 — 189,996 Estimated Fair Value Measurement at Reporting Date Using Balance at December 31, 2015 (in thousands) Level 1 Level 2 Level 3 Financial Assets: Securities held to maturity $ — $ 43,441 $ — $ 43,441 Portfolio loans, net — — 2,782,704 2,782,704 State tax credits, held for sale — — 43,647 43,647 Financial Liabilities: Deposits 2,428,403 — 356,251 2,784,654 Subordinated debentures — 35,432 — 35,432 Federal Home Loan Bank advances — 109,994 — 109,994 Other borrowings — 270,286 — 270,286

New Authoritative Accounting Gu

New Authoritative Accounting Guidance	9 Months Ended
	Sep. 30, 2016
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Authoritative Accounting Guidance	NEW AUTHORITATIVE ACCOUNTING GUIDANCE FASB ASU 2016-15 "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments" In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230)" which addresses changes to reduce the presentation diversity of certain cash receipts and cash payments in the statement of cash flows, including debt prepayment or extinguishment costs, settlement of certain debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, and distributions received from equity method investees. The guidance becomes effective for fiscal years beginning afte r December 15, 2017, in cluding interim periods within those fiscal years, with early adoption permitted. An entity that elects early adoption must adopt all of the amendments in the same period. The new standard will be applied retrospectively, but may be applied prospectively if retrospective application would be impracticable. The Company is currently evaluating the new guidance and has not determined the impact this standard may have on its consolidated statement of cash flows. 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 is currently evaluating the new guidance and has not determined the impact this standard may have on its financial statements. FASB ASU 2016-09 "Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting" In March 2016, the FASB issued ASU 2016-09, "Compensation-Stock Compensation (Topic 718)" which impacts accounting for share-based payment transactions, including income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 requires all excess tax benefits and tax deficiencies to be recognized in the income statement as income tax expense (or benefit.) The tax effects of exercised or vested awards must be treated as discrete items in the reporting period in which they occur, regardless of whether the benefit reduces taxes payable in the current period. Excess tax benefits will be classified with other income tax cash flows as an operating activity, and cash paid by an employer when withholding shares for tax liabilities should be classified as a financing activity. The guidance becomes effective for annual periods beginning after December 15, 2017, and interim periods beginning after December 15, 2018. Early adoption is permitted. The Company is currently evaluating the new guidance and 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. Early adoption will be permitted. The Company is currently evaluating the new guidance and has not determined the impact this standard may have on its consolidated balance sheets. FASB ASU 2016-01 "Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities" In January 2016, the FASB issued 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. For financial liabilities where the fair value option has been elected, changes in fair value due to instrument-specific credit risk must be recognized in other comprehensive income. When measuring the fair value of financial instruments at amortized cost, the exit price must be used for disclosure purposes. The ASU also requires that financial assets and liabilities be presented separately in the notes to the financial statements. This ASU becomes effective for the Company in the first quarter of 2018. Early adoption is permitted. The Company is currently evaluating the new guidance and has not determined the impact this standard may have on its financial statements. FASB ASU 2014-09, "Revenue from Contracts with Customers" In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers”. The objective of ASU 2014-09 is to establish a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most of the existing revenue recognition guidance, including industry-specific guidance. The core principle of ASU 2014-09 is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In applying the new guidance, an entity will (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the contract’s performance obligations; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 applies to all contracts with customers except those that are within the scope of other topics in the FASB Accounting Standards Codification. The new guidance was originally effective for annual reporting periods (including interim periods within those periods) beginning after December 15, 2016 for public companies. In August 2015, the FASB issued ASU 2015-14, which defers the effective date of this guidance to annual reporting periods beginning after December 15, 2017 for public companies, and permits early adoption on a limited basis. The Company is currently evaluating the new guidance and has not determined the impact this standard may have on its financial statements, nor decided upon the method of adoption. Entities have the option of using either a full retrospective or modified approach of adoption.

Subsequent Events (Notes)

Subsequent Events (Notes)	9 Months Ended
	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Events [Text Block]	SUBSEQUENT EVENTS On October 10, 2016, the Company entered into a definitive merger agreement to acquire Jefferson County Bancshares, Inc. (“JCB”). JCB and its wholly-owned subsidiary, Eagle Bank and Trust Company of Missouri, have approximately $935 million in assets, $670 million in loans, and $763 million in deposits as of June 30, 2016. JCB operates 13 full service retail and commercial banking offices in metropolitan St. Louis and Perry County, Missouri. JCB shareholders will receive, based on their election, cash consideration in an amount of $85.39 per share of JCB common stock or 2.75 shares of EFSC common stock per share of JCB common stock. Aggregate consideration at the closing will be 3.3 million shares of EFSC common stock and approximately $26.6 million in cash, subject to adjustment for any JCB stock option exercises. Based on EFSC’s 15-day volume weighted average closing stock price of $31.52 as of October 10, 2016, the overall transaction has an estimated value of $130.6 million, including JCB’s common stock and stock options. The transaction is anticipated to close in early 2017, and is subject to normal and customary closing conditions, including but not limited to, regulatory approval and approval by JCB shareholders.

Summary of Significant Accoun20

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2016
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. In 2016, the Company changed its presentation of certificates of deposit on the Condensed Consolidated Balance Sheets to separate brokered deposit sources from other sources. The corresponding prior period balances were reclassified to conform to the current year presentation. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included.
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 September 30, 2016 , management performed its quarterly analysis of all securities with an unrealized loss and concluded no individual securities were other-than-temporarily impaired.
New Authoritative Accounting Guidance	FASB ASU 2016-15 "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments" In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230)" which addresses changes to reduce the presentation diversity of certain cash receipts and cash payments in the statement of cash flows, including debt prepayment or extinguishment costs, settlement of certain debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, and distributions received from equity method investees. The guidance becomes effective for fiscal years beginning afte r December 15, 2017, in cluding interim periods within those fiscal years, with early adoption permitted. An entity that elects early adoption must adopt all of the amendments in the same period. The new standard will be applied retrospectively, but may be applied prospectively if retrospective application would be impracticable. The Company is currently evaluating the new guidance and has not determined the impact this standard may have on its consolidated statement of cash flows. 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 is currently evaluating the new guidance and has not determined the impact this standard may have on its financial statements. FASB ASU 2016-09 "Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting" In March 2016, the FASB issued ASU 2016-09, "Compensation-Stock Compensation (Topic 718)" which impacts accounting for share-based payment transactions, including income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. ASU 2016-09 requires all excess tax benefits and tax deficiencies to be recognized in the income statement as income tax expense (or benefit.) The tax effects of exercised or vested awards must be treated as discrete items in the reporting period in which they occur, regardless of whether the benefit reduces taxes payable in the current period. Excess tax benefits will be classified with other income tax cash flows as an operating activity, and cash paid by an employer when withholding shares for tax liabilities should be classified as a financing activity. The guidance becomes effective for annual periods beginning after December 15, 2017, and interim periods beginning after December 15, 2018. Early adoption is permitted. The Company is currently evaluating the new guidance and 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. Early adoption will be permitted. The Company is currently evaluating the new guidance and has not determined the impact this standard may have on its consolidated balance sheets. FASB ASU 2016-01 "Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities" In January 2016, the FASB issued 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. For financial liabilities where the fair value option has been elected, changes in fair value due to instrument-specific credit risk must be recognized in other comprehensive income. When measuring the fair value of financial instruments at amortized cost, the exit price must be used for disclosure purposes. The ASU also requires that financial assets and liabilities be presented separately in the notes to the financial statements. This ASU becomes effective for the Company in the first quarter of 2018. Early adoption is permitted. The Company is currently evaluating the new guidance and has not determined the impact this standard may have on its financial statements. FASB ASU 2014-09, "Revenue from Contracts with Customers" In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers”. The objective of ASU 2014-09 is to establish a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most of the existing revenue recognition guidance, including industry-specific guidance. The core principle of ASU 2014-09 is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In applying the new guidance, an entity will (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the contract’s performance obligations; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 applies to all contracts with customers except those that are within the scope of other topics in the FASB Accounting Standards Codification. The new guidance was originally effective for annual reporting periods (including interim periods within those periods) beginning after December 15, 2016 for public companies. In August 2015, the FASB issued ASU 2015-14, which defers the effective date of this guidance to annual reporting periods beginning after December 15, 2017 for public companies, and permits early adoption on a limited basis. The Company is currently evaluating the new guidance and has not determined the impact this standard may have on its financial statements, nor decided upon the method of adoption. Entities have the option of using either a full retrospective or modified approach of adoption.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2016
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 September 30, Nine months ended September 30, (in thousands, except per share data) 2016 2015 2016 2015 Net income as reported $ 11,832 $ 9,709 $ 35,209 $ 27,771 Weighted average common shares outstanding 19,997 19,995 20,002 19,970 Additional dilutive common stock equivalents 227 266 229 266 Weighted average diluted common shares outstanding 20,224 20,261 20,231 20,236 Basic earnings per common share: $ 0.59 $ 0.49 $ 1.76 $ 1.39 Diluted earnings per common share: $ 0.59 $ 0.48 $ 1.74 $ 1.37

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2016
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: September 30, 2016 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 97,745 $ 1,313 $ — $ 99,058 Obligations of states and political subdivisions 37,132 1,511 (307 ) 38,336 Agency mortgage-backed securities 336,693 5,826 (304 ) 342,215 Total securities available for sale $ 471,570 $ 8,650 $ (611 ) $ 479,609 Held to maturity securities: Obligations of states and political subdivisions $ 14,777 $ 359 $ (2 ) $ 15,134 Agency mortgage-backed securities 26,254 830 — 27,084 Total securities held to maturity $ 41,031 $ 1,189 $ (2 ) $ 42,218 December 31, 2015 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 98,699 $ 309 $ — $ 99,008 Obligations of states and political subdivisions 40,700 1,343 (342 ) 41,701 Agency mortgage-backed securities 311,516 2,046 (2,501 ) 311,061 Total securities available for sale $ 450,915 $ 3,698 $ (2,843 ) $ 451,770 Held to maturity securities: Obligations of states and political subdivisions $ 14,831 $ 63 $ (50 ) $ 14,844 Agency mortgage-backed securities 28,883 — (286 ) 28,597 Total securities held to maturity $ 43,714 $ 63 $ (336 ) $ 43,441
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: September 30, 2016 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 97,745 $ 1,313 $ — $ 99,058 Obligations of states and political subdivisions 37,132 1,511 (307 ) 38,336 Agency mortgage-backed securities 336,693 5,826 (304 ) 342,215 Total securities available for sale $ 471,570 $ 8,650 $ (611 ) $ 479,609 Held to maturity securities: Obligations of states and political subdivisions $ 14,777 $ 359 $ (2 ) $ 15,134 Agency mortgage-backed securities 26,254 830 — 27,084 Total securities held to maturity $ 41,031 $ 1,189 $ (2 ) $ 42,218 December 31, 2015 (in thousands) Amortized Cost Gross Gross Fair Value Available for sale securities: Obligations of U.S. Government-sponsored enterprises $ 98,699 $ 309 $ — $ 99,008 Obligations of states and political subdivisions 40,700 1,343 (342 ) 41,701 Agency mortgage-backed securities 311,516 2,046 (2,501 ) 311,061 Total securities available for sale $ 450,915 $ 3,698 $ (2,843 ) $ 451,770 Held to maturity securities: Obligations of states and political subdivisions $ 14,831 $ 63 $ (50 ) $ 14,844 Agency mortgage-backed securities 28,883 — (286 ) 28,597 Total securities held to maturity $ 43,714 $ 63 $ (336 ) $ 43,441
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of debt securities at September 30, 2016 , 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 4 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 $ 52,384 $ 52,637 $ — $ — Due after one year through five years 70,128 72,153 8,189 8,356 Due after five years through ten years 8,836 9,328 6,588 6,778 Due after ten years 3,529 3,276 — — Agency mortgage-backed securities 336,693 342,215 26,254 27,084 $ 471,570 $ 479,609 $ 41,031 $ 42,218
Schedule of Unrealized Loss on Investments	The following table represents a summary of investment securities that had an unrealized loss: September 30, 2016 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 states and political subdivisions $ — $ — $ 3,566 $ 309 $ 3,566 $ 309 Agency mortgage-backed securities 6,654 11 13,379 293 20,033 304 $ 6,654 $ 11 $ 16,945 $ 602 $ 23,599 $ 613 December 31, 2015 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 states and political subdivisions $ 2,199 $ 12 $ 9,395 $ 380 $ 11,594 $ 392 Agency mortgage-backed securities 189,229 2,050 21,020 737 210,249 2,787 $ 191,428 $ 2,062 $ 30,415 $ 1,117 $ 221,843 $ 3,179
Schedule of Realized Gain (Loss)	The gross gains and gross losses realized from sales of available for sale investment securities were as follows: Three months ended September 30, Nine months ended September 30, (in thousands) 2016 2015 2016 2015 Gross gains realized $ 86 $ — $ 86 $ 63 Gross losses realized — — — (40 ) Proceeds from sales 2,493 — 2,493 41,069

Portfolio Loans (Tables)

Portfolio Loans (Tables) - Portfolio loans, net	9 Months Ended
	Sep. 30, 2016
Non-covered Loans [Line Items]
Summary of Portfolio Loans by Category	Below is a summary of Portfolio loans by category at September 30, 2016 and December 31, 2015 : (in thousands) September 30, 2016 December 31, 2015 Commercial and industrial $ 1,598,815 $ 1,484,327 Real estate: Commercial - investor owned 515,055 428,064 Commercial - owner occupied 340,916 342,959 Construction and land development 188,856 161,061 Residential 233,960 196,498 Total real estate loans 1,278,787 1,128,582 Consumer and other 160,535 137,537 Portfolio loans 3,038,137 2,750,446 Unearned loan fees, net (432 ) 291 Portfolio loans, including unearned loan fees $ 3,037,705 $ 2,750,737
Summary of Allowance for Loan Losses and the Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method	(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, 2015 $ 22,056 $ 3,484 $ 2,969 $ 1,704 $ 1,796 $ 1,432 $ 33,441 Provision (provision reversal) for loan losses 1,120 (116 ) 80 (65 ) 11 (197 ) 833 Losses charged off (68 ) — — — — (5 ) (73 ) Recoveries 53 7 68 6 34 4 172 Balance at March 31, 2016 $ 23,161 $ 3,375 $ 3,117 $ 1,645 $ 1,841 $ 1,234 $ 34,373 Provision (provision reversal) for loan losses 302 (27 ) (541 ) (434 ) (80 ) 1,496 716 Losses charged off (157 ) — — — — (6 ) (163 ) Recoveries 502 8 15 8 36 3 572 Balance at June 30, 2016 $ 23,808 $ 3,356 $ 2,591 $ 1,219 $ 1,797 $ 2,727 $ 35,498 Provision (provision reversal) for loan losses 3,575 10 94 (730 ) 168 (79 ) 3,038 Losses charged off (2,044 ) — — — (25 ) (4 ) (2,073 ) Recoveries 69 8 17 913 26 2 1,035 Balance at September 30, 2016 $ 25,408 $ 3,374 $ 2,702 $ 1,402 $ 1,966 $ 2,646 $ 37,498 (in thousands) Commercial and industrial CRE - investor owned CRE - owner occupied Construction and land development Residential real estate Consumer and other Total Balance September 30, 2016 Allowance for loan losses - Ending balance: Individually evaluated for impairment $ 3,785 $ — $ — $ 158 $ 3 $ 1,855 $ 5,801 Collectively evaluated for impairment 21,623 3,374 2,702 1,244 1,963 791 31,697 Total $ 25,408 $ 3,374 $ 2,702 $ 1,402 $ 1,966 $ 2,646 $ 37,498 Loans - Ending balance: Individually evaluated for impairment $ 13,414 $ 252 $ 1,666 $ 1,907 $ 124 $ 4,499 $ 21,862 Collectively evaluated for impairment 1,585,401 514,803 339,250 186,949 233,836 155,604 3,015,843 Total $ 1,598,815 $ 515,055 $ 340,916 $ 188,856 $ 233,960 $ 160,103 $ 3,037,705 Balance December 31, 2015 Allowance for loan losses - Ending balance: Individually evaluated for impairment $ 1,953 $ — $ 6 $ 369 $ 7 $ — $ 2,335 Collectively evaluated for impairment 20,103 3,484 2,963 1,335 1,789 1,432 31,106 Total $ 22,056 $ 3,484 $ 2,969 $ 1,704 $ 1,796 $ 1,432 $ 33,441 Loans - Ending balance: Individually evaluated for impairment $ 4,514 $ 921 $ 1,962 $ 2,800 $ 681 $ — $ 10,878 Collectively evaluated for impairment 1,479,813 427,143 340,997 158,261 195,817 137,828 2,739,859 Total $ 1,484,327 $ 428,064 $ 342,959 $ 161,061 $ 196,498 $ 137,828 $ 2,750,737
Summary of Portfolio Loans Individually Evaluated for Impairment and Recorded Investment in Impaired Non-Covered Loans by Category	September 30, 2016 (in thousands) Non-accrual Restructured Loans over 90 days past due and still accruing interest Total Commercial and industrial $ 10,959 $ 2,311 $ — $ 13,270 Real estate: Commercial - investor owned 253 — — 253 Commercial - owner occupied — — — — Construction and land development 2,258 20 — 2,278 Residential 129 — — 129 Consumer and other 4,508 — — 4,508 Total $ 18,107 $ 2,331 $ — $ 20,438 December 31, 2015 (in thousands) Non-accrual Restructured Loans over 90 days past due and still accruing interest Total Commercial and industrial $ 4,406 $ 307 $ — $ 4,713 Real estate: Commercial - investor owned 927 — — 927 Commercial - owner occupied 198 — — 198 Construction and land development 3,444 — — 3,444 Residential 705 — — 705 Consumer and other — — — — Total $ 9,680 $ 307 $ — $ 9,987 September 30, 2016 (in thousands) Unpaid Recorded Recorded Allowance Total Related Allowance Average Commercial and industrial $ 14,895 $ 136 $ 13,134 $ 13,270 $ 3,785 $ 15,666 Real estate loans: Commercial - investor owned 252 253 — 253 — 250 Commercial - owner occupied — — — — — — Construction and land development 1,907 1,920 358 2,278 158 2,403 Residential 149 65 64 129 3 652 Consumer and other 4,499 — 4,508 4,508 1,855 4,598 Total $ 21,702 $ 2,374 $ 18,064 $ 20,438 $ 5,801 $ 23,569 December 31, 2015 (in thousands) Unpaid Recorded Recorded Allowance Total Related Allowance Average Commercial and industrial $ 5,554 $ 509 $ 4,204 $ 4,713 $ 1,953 $ 6,970 Real estate loans: Commercial - investor owned 927 927 — 927 — 970 Commercial - owner occupied 329 85 113 198 6 301 Construction and land development 4,349 2,914 530 3,444 369 3,001 Residential 705 637 68 705 7 682 Consumer and other — — — — — — Total $ 11,864 $ 5,072 $ 4,915 $ 9,987 $ 2,335 $ 11,924 The following table presents details for past due and impaired loans: Three months ended September 30, Nine months ended September 30, (in thousands) 2016 2015 2016 2015 Total interest income that would have been recognized under original terms $ 226 $ 369 $ 703 $ 913 Total cash received and recognized as interest income on non-accrual loans 203 81 253 206 Total interest income recognized on impaired loans 32 4 63 31
Summary of Recorded Investment by for Portfolio Loans Restructured	The recorded investment by category for the Portfolio loans that have been restructured during the three and nine months ended September 30, 2016 and 2015 , is as follows: Three months ended September 30, 2016 Three months ended September 30, 2015 (in thousands, except for number of loans) Number of Loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Number of Loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Commercial and industrial — $ — $ — — $ — $ — Real estate: Commercial - investor owned — — — — — — Commercial - owner occupied — — — — — — Construction and land development — — — — — — Residential — — — — — — Consumer and other — — — — — — Total — $ — $ — — $ — $ — Nine months ended September 30, 2016 Nine months ended September 30, 2015 (in thousands, except for number of loans) Number of Loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Number of Loans Pre-Modification Outstanding Recorded Balance Post-Modification Outstanding Recorded Balance Commercial and industrial 2 $ 2,341 $ 2,341 — $ — $ — Real estate: Commercial - investor owned 1 248 248 — — — Commercial - owner occupied — — — — — — Construction and land development 1 20 20 — — — Residential — — — — — — Consumer and other — — — — — — Total 4 $ 2,609 $ 2,609 — $ — $ —
Summary of Recorded Investment by Category for Portfolio Loans Restructured and Subsequently Defaulted	The restructured loans resulted from deferral of principal and extending the term to maturity. As of September 30, 2016 , the Company had $1.2 million specific reserves allocated to loans that have been restructured. There were no Portfolio loans restructured that subsequently defaulted during the three and nine months ended September 30, 2016 or 2015 .
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 Portfolio loans by portfolio class and category at September 30, 2016 and December 31, 2015 is shown below. September 30, 2016 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ — $ 364 $ 364 $ 1,598,451 $ 1,598,815 Real estate: Commercial - investor owned 136 — 136 514,919 515,055 Commercial - owner occupied 225 — 225 340,691 340,916 Construction and land development — 1,529 1,529 187,327 188,856 Residential 73 60 133 233,827 233,960 Consumer and other — — — 160,103 160,103 Total $ 434 $ 1,953 $ 2,387 $ 3,035,318 $ 3,037,705 December 31, 2015 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ 505 $ 888 $ 1,393 $ 1,482,934 $ 1,484,327 Real estate: Commercial - investor owned 464 — 464 427,600 428,064 Commercial - owner occupied 94 184 278 342,681 342,959 Construction and land development 384 2,273 2,657 158,404 161,061 Residential 70 681 751 195,747 196,498 Consumer and other 20 — 20 137,808 137,828 Total $ 1,537 $ 4,026 $ 5,563 $ 2,745,174 $ 2,750,737
Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category	The recorded investment by risk category of the Portfolio loans by portfolio class and category at September 30, 2016 , which is based upon the most recent analysis performed, and December 31, 2015 is as follows: September 30, 2016 (in thousands) Pass (1-6) Watch (7) Substandard (8) Doubtful (9) Total Commercial and industrial $ 1,457,729 $ 63,572 $ 77,514 $ — $ 1,598,815 Real estate: Commercial - investor owned 501,228 9,549 4,278 — 515,055 Commercial - owner occupied 311,427 25,369 4,120 — 340,916 Construction and land development 179,515 6,050 3,291 — 188,856 Residential 226,287 4,224 3,449 — 233,960 Consumer and other 153,458 711 5,934 — 160,103 Total $ 2,829,644 $ 109,475 $ 98,586 $ — $ 3,037,705 December 31, 2015 (in thousands) Pass (1-6) Watch (7) Substandard (8) Doubtful (9) Total Commercial and industrial $ 1,356,864 $ 90,370 $ 37,093 $ — $ 1,484,327 Real estate: Commercial - investor owned 403,820 18,868 5,376 — 428,064 Commercial - owner occupied 314,791 24,727 3,441 — 342,959 Construction and land development 146,601 10,114 4,346 — 161,061 Residential 188,269 5,138 3,091 — 196,498 Consumer and other 131,060 721 6,047 — 137,828 Total $ 2,541,405 $ 149,938 $ 59,394 $ — $ 2,750,737

Purchased Credit Impaired ("P24

Purchased Credit Impaired ("PCI") Loans (Tables)	9 Months Ended
	Sep. 30, 2016
Covered Loans [Line Items]
Rollforward of PCI Loans, Net of Allowance for Loan Losses	The following table is a rollforward of PCI loans, net of the allowance for loan losses, for the nine months ended September 30, 2016 and 2015 . (in thousands) Contractual Cashflows Non-accretable Difference Accretable Yield Carrying Amount Balance January 1, 2016 $ 116,689 $ 26,765 $ 25,341 $ 64,583 Principal reductions and interest payments (20,417 ) — — (20,417 ) Accretion of loan discount — — (4,984 ) 4,984 Changes in contractual and expected cash flows due to remeasurement 9,194 975 (1,043 ) 9,262 Reductions due to disposals (27,888 ) (6,779 ) (3,713 ) (17,396 ) Balance September 30, 2016 $ 77,578 $ 20,961 $ 15,601 $ 41,016 Balance January 1, 2015 $ 178,145 $ 65,719 $ 28,733 $ 83,693 Principal reductions and interest payments (19,315 ) — — (19,315 ) Accretion of loan discount — — (8,604 ) 8,604 Changes in contractual and expected cash flows due to remeasurement (5,731 ) (26,797 ) 9,233 11,833 Reductions due to disposals (19,734 ) (4,183 ) (3,133 ) (12,418 ) Balance September 30, 2015 $ 133,365 $ 34,739 $ 26,229 $ 72,397
Covered Loans
Covered Loans [Line Items]
Summary of PCI Loans by Category	Below is a summary of PCI loans by category at September 30, 2016 and December 31, 2015 : September 30, 2016 December 31, 2015 (in thousands) Weighted- Average Risk Rating 1 Recorded Investment PCI Loans Weighted- Average Risk Rating 1 Recorded Investment PCI Loans Commercial and industrial 5.84 $ 3,282 6.70 $ 3,863 Real estate: Commercial - investor owned 6.94 14,595 6.98 25,272 Commercial - owner occupied 6.34 12,417 6.30 19,414 Construction and land development 5.67 4,919 6.28 6,838 Residential 5.66 12,173 5.44 19,287 Total real estate loans 44,104 70,811 Consumer and other 1.54 63 1.89 84 Purchased credit impaired loans $ 47,449 $ 74,758 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 September 30, 2016 and December 31, 2015 is shown below: September 30, 2016 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ 805 $ — $ 805 $ 2,477 $ 3,282 Real estate: Commercial - investor owned — — — 14,595 14,595 Commercial - owner occupied 229 — 229 12,188 12,417 Construction and land development — — — 4,919 4,919 Residential 84 55 139 12,034 12,173 Consumer and other — — — 63 63 Total $ 1,118 $ 55 $ 1,173 $ 46,276 $ 47,449 December 31, 2015 (in thousands) 30-89 Days Past Due 90 or More Past Due Total Past Due Current Total Commercial and industrial $ — $ — $ — $ 3,863 $ 3,863 Real estate: Commercial - investor owned 2,342 3,661 6,003 19,269 25,272 Commercial - owner occupied 731 — 731 18,683 19,414 Construction and land development — — — 6,838 6,838 Residential 1,594 130 1,724 17,563 19,287 Consumer and other 4 — 4 80 84 Total $ 4,671 $ 3,791 $ 8,462 $ 66,296 $ 74,758
Summary of FDIC Loss Share Receivable	.

Derivative Financial Instrume25

Derivative Financial Instruments (Tables) - Client-Related	9 Months Ended
	Sep. 30, 2016
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) September 30, December 31, September 30, December 31, September 30, December 31, Non-designated hedging instruments Interest rate swap contracts $ 171,792 $ 153,630 $ 2,099 $ 1,155 $ 2,099 $ 1,155
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	For the three and nine months ended September 30, 2016 and 2015 , the gains and losses offset each other due to the Company's hedging of the client swaps with other bank counterparties.

Commitments (Tables)

Commitments (Tables)	9 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule of Commitments	The contractual amounts of off-balance-sheet financial instruments as of September 30, 2016 , and December 31, 2015 , are as follows: (in thousands) September 30, 2016 December 31, 2015 Commitments to extend credit $ 1,086,372 $ 1,140,028 Standby letters of credit 64,360 54,648

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016 and December 31, 2015 , segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value: September 30, 2016 (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 $ — $ 99,058 $ — $ 99,058 Obligations of states and political subdivisions — 35,242 3,094 38,336 Residential mortgage-backed securities — 342,215 — 342,215 Total securities available for sale $ — $ 476,515 $ 3,094 $ 479,609 State tax credits held for sale — — 4,801 4,801 Derivative financial instruments — 2,099 — 2,099 Total assets $ — $ 478,614 $ 7,895 $ 486,509 Liabilities Derivative financial instruments $ — $ 2,099 $ — $ 2,099 Total liabilities $ — $ 2,099 $ — $ 2,099 December 31, 2015 (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 $ — $ 99,008 $ — $ 99,008 Obligations of states and political subdivisions — 38,624 3,077 41,701 Residential mortgage-backed securities — 311,061 — 311,061 Total securities available for sale $ — $ 448,693 $ 3,077 $ 451,770 State tax credits held for sale — — 5,941 5,941 Derivative financial instruments — 1,155 — 1,155 Total assets $ — $ 449,848 $ 9,018 $ 458,866 Liabilities Derivative financial instruments $ — $ 1,155 $ — $ 1,155 Total liabilities $ — $ 1,155 $ — $ 1,155
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 September 30, 2016 and 2015 . • Purchases, sales, issuances and settlements . There were no Level 3 purchases during the quarter ended September 30, 2016 or 2015 . • Transfers in and/or out of Level 3 . There were no Level 3 transfers during the quarter ended September 30, 2016 and 2015 . Securities available for sale, at fair value Three months ended September 30, Nine months ended September 30, (in thousands) 2016 2015 2016 2015 Beginning balance $ 3,093 $ 3,070 $ 3,077 $ 3,059 Total gains: Included in other comprehensive income 1 7 17 18 Purchases, sales, issuances and settlements: Purchases — — — — Ending balance $ 3,094 $ 3,077 $ 3,094 $ 3,077 Change in unrealized gains relating to assets still held at the reporting date $ 1 $ 7 $ 17 $ 18 State tax credits held for sale Three months ended September 30, Nine months ended September 30, (in thousands) 2016 2015 2016 2015 Beginning balance $ 4,774 $ 9,965 $ 5,941 $ 11,689 Total gains: Included in earnings 27 124 144 318 Purchases, sales, issuances and settlements: Sales — — (1,284 ) (1,918 ) Ending balance $ 4,801 $ 10,089 $ 4,801 $ 10,089 Change in unrealized gains (losses) relating to assets still held at the reporting date $ 27 $ 124 $ (237 ) $ (186 )
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 September 30, 2016 . (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 nine Impaired loans $ 357 $ — $ — $ 357 $ 2,073 $ 2,309 Other real estate — — — — — 1 Total $ 357 $ — $ — $ 357 $ 2,073 $ 2,310 (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 September 30, 2016 and December 31, 2015 . September 30, 2016 December 31, 2015 (in thousands) Carrying Amount Estimated fair value Carrying Amount Estimated fair value Balance sheet assets Cash and due from banks $ 56,789 $ 56,789 $ 47,935 $ 47,935 Federal funds sold 488 488 91 91 Interest-bearing deposits 63,202 63,202 47,131 47,131 Securities available for sale 479,609 479,609 451,770 451,770 Securities held to maturity 41,031 42,218 43,714 43,441 Other investments, at cost 19,789 19,789 17,455 17,455 Loans held for sale 7,663 7,663 6,598 6,598 Derivative financial instruments 2,099 2,099 1,155 1,155 Portfolio loans, net 3,041,223 3,045,230 2,781,879 2,782,704 State tax credits, held for sale 44,180 48,959 45,850 49,588 Accrued interest receivable 8,526 8,526 8,399 8,399 Balance sheet liabilities Deposits 3,124,825 3,126,534 2,784,591 2,784,654 Subordinated debentures 56,807 36,275 56,807 35,432 Federal Home Loan Bank advances 129,000 128,996 110,000 109,994 Other borrowings 190,022 189,996 270,326 270,286 Derivative financial instruments 2,099 2,099 1,155 1,155 Accrued interest payable 648 648 629 629
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 September 30, 2016 , and December 31, 2015 . Estimated Fair Value Measurement at Reporting Date Using Balance at (in thousands) Level 1 Level 2 Level 3 Financial Assets: Securities held to maturity $ — $ 42,218 $ — $ 42,218 Portfolio loans, net — — 3,045,230 3,045,230 State tax credits, held for sale — — 44,158 44,158 Financial Liabilities: Deposits 2,636,980 — 489,554 3,126,534 Subordinated debentures — 36,275 — 36,275 Federal Home Loan Bank advances — 128,996 — 128,996 Other borrowings — 189,996 — 189,996 Estimated Fair Value Measurement at Reporting Date Using Balance at December 31, 2015 (in thousands) Level 1 Level 2 Level 3 Financial Assets: Securities held to maturity $ — $ 43,441 $ — $ 43,441 Portfolio loans, net — — 2,782,704 2,782,704 State tax credits, held for sale — — 43,647 43,647 Financial Liabilities: Deposits 2,428,403 — 356,251 2,784,654 Subordinated debentures — 35,432 — 35,432 Federal Home Loan Bank advances — 109,994 — 109,994 Other borrowings — 270,286 — 270,286

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net income as reported	$ 11,832	$ 9,709	$ 35,209	$ 27,771
Impact of assumed conversions
Weighted average common shares outstanding (in shares)	19,997,000	19,995,000	20,002,000	19,970,000
Additional dilutive common stock equivalents (in shares)	227,000	266,000	229,000	266,000
Weighted average diluted common shares outstanding (in shares)	20,224,000	20,261,000	20,231,000	20,236,000
Basic earnings per common share (in dollars per share)	$ 0.59	$ 0.49	$ 1.76	$ 1.39
Diluted earnings per common share (in dollars per share)	$ 0.59	$ 0.48	$ 1.74	$ 1.37
Common stock equivalents excluded from earnings per share calculations due to anti-dilutive effect (in shares)	0	80,220	2,900	88,040
Convertible Debt Securities
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Convertible trust preferred securities, interest rate, stated percentage	9.00%	9.00%	9.00%	9.00%

Investments - Schedule of Avail

Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 41,031	$ 43,714
Gross Unrealized Gains	1,189	63
Gross Unrealized Losses	(2)	(336)
Fair Value	42,218	43,441
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	471,570	450,915
Gross Unrealized Gains	8,650	3,698
Gross Unrealized Losses	(611)	(2,843)
Fair Value	479,609	451,770
Obligations of U.S. Government-sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	97,745	98,699
Gross Unrealized Gains	1,313	309
Gross Unrealized Losses	0	0
Fair Value	99,058	99,008
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	37,132	40,700
Gross Unrealized Gains	1,511	1,343
Gross Unrealized Losses	(307)	(342)
Fair Value	38,336	41,701
Agency mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	336,693	311,516
Gross Unrealized Gains	5,826	2,046
Gross Unrealized Losses	(304)	(2,501)
Fair Value	342,215	311,061
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	14,777	14,831
Gross Unrealized Gains	359	63
Gross Unrealized Losses	(2)	(50)
Fair Value	15,134	14,844
Agency mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	26,254	28,883
Gross Unrealized Gains	830	0
Gross Unrealized Losses	0	(286)
Fair Value	$ 27,084	$ 28,597

Investments - Investments Class

Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Available for sale, Amortized Cost
Due in one year or less	$ 52,384
Due after one year through five years	70,128
Due after five years through ten years	8,836
Due after ten years	3,529
Agency mortgage-backed securities	336,693
Amortized Cost	471,570	$ 450,915
Available for sale, Estimated Fair Value
Due in one year or less	52,637
Due after one year through five years	72,153
Due after five years through ten years	9,328
Due after ten years	3,276
Agency mortgage-backed securities	342,215
Available for sale, fair value	479,609	451,770
Held to maturity, Amortized Cost
Due in one year or less	0
Due after one year through five years	8,189
Due after five years through ten years	6,588
Due after ten years	0
Agency mortgage-backed securities	26,254
Amortized Cost	41,031	43,714
Held to maturity, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	8,356
Due after five years through ten years	6,778
Due after ten years	0
Agency mortgage-backed securities	27,084
Held to maturity, fair value	$ 42,218	$ 43,441

Investments - Schedule of Unrea

Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 6,654	$ 191,428
Less than 12 months, unrealized losses	11	2,062
12 months or more, fair value	16,945	30,415
12 months or more, unrealized losses	602	1,117
Total, fair value	23,599	221,843
Total, unrealized losses	613	3,179
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	0	2,199
Less than 12 months, unrealized losses	0	12
12 months or more, fair value	3,566	9,395
12 months or more, unrealized losses	309	380
Total, fair value	3,566	11,594
Total, unrealized losses	309	392
Agency mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	6,654	189,229
Less than 12 months, unrealized losses	11	2,050
12 months or more, fair value	13,379	21,020
12 months or more, unrealized losses	293	737
Total, fair value	20,033	210,249
Total, unrealized losses	$ 304	$ 2,787

Investments - Schedule of Reali

Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Gross gains realized	$ 86	$ 0	$ 86	$ 63
Gross losses realized	0	0	0	(40)
Proceeds from sales	$ 2,493	$ 0	$ 2,493	$ 41,069

Investments - Narrative (Detail

Investments - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Other investments, at cost	$ 19,789	$ 17,455
Maximum percentage of shareholders' equity security holdings held of one issuer	10.00%	10.00%
Available-for-sale securities pledged as collateral, fair value	$ 321,500	$ 334,400
Mortgage-backed securities, weighted average life	4 years

Portfolio Loans - Summary of Po

Portfolio Loans - Summary of Portfolio Loans by Category (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, including unearned loan fees	$ 3,037,705	$ 2,750,737
Portfolio loans, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	3,038,137	2,750,446
Unearned loan fees, net	(432)	291
Portfolio loans, including unearned loan fees	3,037,705	2,750,737
Portfolio loans, net | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	1,598,815	1,484,327
Portfolio loans, net | Commercial - investor owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	515,055	428,064
Portfolio loans, net | Commercial - owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	340,916	342,959
Portfolio loans, net | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	188,856	161,061
Portfolio loans, net | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	233,960	196,498
Portfolio loans, net | Total real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	1,278,787	1,128,582
Portfolio loans, net | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	160,535	137,537
Portfolio loans, including unearned loan fees	$ 160,103	$ 137,828

Portfolio Loans - Summary of Al

Portfolio Loans - Summary of Allowance for Loan Losses by Portfolio Class and Category (Details) - Portfolio loans, net - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2015	$ 35,498	$ 34,373	$ 33,441
Provision (provision reversal) charged to expense	3,038	716	833
Losses charged off	(2,073)	(163)	(73)
Recoveries	1,035	572	172
Balance at March 31, 2016	37,498	35,498	34,373
Commercial and industrial
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2015	23,808	23,161	22,056
Provision (provision reversal) charged to expense	3,575	302	1,120
Losses charged off	(2,044)	(157)	(68)
Recoveries	69	502	53
Balance at March 31, 2016	25,408	23,808	23,161
CRE - owner occupied
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2015	2,591	3,117	2,969
Provision (provision reversal) charged to expense	94	541	80
Losses charged off	0	0	0
Recoveries	17	15	68
Balance at March 31, 2016	2,702	2,591	3,117
Commercial Real Estate Investor Owned
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2015	3,356	3,375	3,484
Provision (provision reversal) charged to expense	10	27	(116)
Losses charged off	0	0	0
Recoveries	8	8	7
Balance at March 31, 2016	3,374	3,356	3,375
Construction and land development
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2015	1,219	1,645	1,704
Provision (provision reversal) charged to expense	730	434	(65)
Losses charged off	0	0	0
Recoveries	913	8	6
Balance at March 31, 2016	1,402	1,219	1,645
Residential real estate
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2015	1,797	1,841	1,796
Provision (provision reversal) charged to expense	168	(80)	11
Losses charged off	(25)	0	0
Recoveries	26	36	34
Balance at March 31, 2016	1,966	1,797	1,841
Consumer and other
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2015	2,727	1,234	1,432
Provision (provision reversal) charged to expense	79	1,496	(197)
Losses charged off	(4)	(6)	(5)
Recoveries	2	3	4
Balance at March 31, 2016	$ 2,646	$ 2,727	$ 1,234

Portfolio Loans - Summary of Re

Portfolio Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Loans - Ending balance:
Loans and Leases Receivable, Gross	$ 3,037,705			$ 2,750,737
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	5,801			2,335
Collectively evaluated for impairment	31,697			31,106
Total	37,498	$ 35,498	$ 34,373	33,441
Loans - Ending balance:
Individually evaluated for impairment	21,862			10,878
Collectively evaluated for impairment	3,015,843			2,739,859
Total	3,038,137			2,750,446
Loans and Leases Receivable, Gross	3,037,705			2,750,737
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	3,785			1,953
Collectively evaluated for impairment	21,623			20,103
Total	25,408	23,808	23,161	22,056
Loans - Ending balance:
Individually evaluated for impairment	13,414			4,514
Collectively evaluated for impairment	1,585,401			1,479,813
Total	1,598,815			1,484,327
Portfolio loans, net | Commercial Real Estate 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	3,374			3,484
Total	3,374	3,356	3,375	3,484
Loans - Ending balance:
Individually evaluated for impairment	252			921
Collectively evaluated for impairment	514,803			427,143
Total	515,055			428,064
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	0			6
Collectively evaluated for impairment	2,702			2,963
Total	2,702	2,591	3,117	2,969
Loans - Ending balance:
Individually evaluated for impairment	1,666			1,962
Collectively evaluated for impairment	339,250			340,997
Total	340,916			342,959
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	158			369
Collectively evaluated for impairment	1,244			1,335
Total	1,402	1,219	1,645	1,704
Loans - Ending balance:
Individually evaluated for impairment	1,907			2,800
Collectively evaluated for impairment	186,949			158,261
Total	188,856			161,061
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	3			7
Collectively evaluated for impairment	1,963			1,789
Total	1,966	1,797	1,841	1,796
Loans - Ending balance:
Individually evaluated for impairment	124			681
Collectively evaluated for impairment	233,836			195,817
Total	233,960			196,498
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	1,855			0
Collectively evaluated for impairment	791			1,432
Total	2,646	$ 2,727	$ 1,234	1,432
Loans - Ending balance:
Individually evaluated for impairment	4,499			0
Collectively evaluated for impairment	155,604			137,828
Total	160,535			137,537
Loans and Leases Receivable, Gross	$ 160,103			$ 137,828

Portfolio Loans - Summary of 37

Portfolio Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) - Portfolio loans, net - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	$ 21,702	$ 11,864
Recorded Investment With No Allowance	2,374	5,072
Recorded Investment With Allowance	18,064	4,915
Total Recorded Investment	20,438	9,987
Related Allowance	5,801	2,335
Average Recorded Investment	23,569	11,924
Commercial and industrial
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	14,895	5,554
Recorded Investment With No Allowance	136	509
Recorded Investment With Allowance	13,134	4,204
Total Recorded Investment	13,270	4,713
Related Allowance	3,785	1,953
Average Recorded Investment	15,666	6,970
Commercial - owner occupied
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	0	329
Recorded Investment With No Allowance	0	85
Recorded Investment With Allowance	0	113
Total Recorded Investment	0	198
Related Allowance	0	6
Average Recorded Investment	0	301
Commercial - investor owned
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	252	927
Recorded Investment With No Allowance	253	927
Recorded Investment With Allowance	0	0
Total Recorded Investment	253	927
Related Allowance	0	0
Average Recorded Investment	250	970
Construction and land development
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	1,907	4,349
Recorded Investment With No Allowance	1,920	2,914
Recorded Investment With Allowance	358	530
Total Recorded Investment	2,278	3,444
Related Allowance	158	369
Average Recorded Investment	2,403	3,001
Residential real estate
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	149	705
Recorded Investment With No Allowance	65	637
Recorded Investment With Allowance	64	68
Total Recorded Investment	129	705
Related Allowance	3	7
Average Recorded Investment	652	682
Consumer and other
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	4,499	0
Recorded Investment With No Allowance	0	0
Recorded Investment With Allowance	4,508	0
Total Recorded Investment	4,508	0
Related Allowance	1,855	0
Average Recorded Investment	$ 4,598	$ 0

Portfolio Loans - Summary of Pa

Portfolio Loans - Summary of Past Due and Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Receivables [Abstract]
Total interest income that would have been recognized under original terms	$ 226	$ 369	$ 703	$ 913
Total cash received and recognized as interest income on non-accrual loans	203	81	253	206
Total interest income recognized on impaired loans	$ 32	$ 4	$ 63	$ 31

Portfolio Loans - Narrative (De

Portfolio Loans - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)loan	Sep. 30, 2015USD ($)loan	Sep. 30, 2016USD ($)loan	Sep. 30, 2015USD ($)loan	Jun. 30, 2016USD ($)	Dec. 31, 2015USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans over 90 days past due and still accruing interest | loan	0		0			0
Unadvanced commitments on impaired loans	$ 500,000		$ 500,000			$ 0
Specific reserves on restructured loans	1,196,000		$ 1,196,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan			0	0
Unadvanced Commitment on Impaired Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Estimated losses attributable to unadvanced commitments on impaired loans					$ 300,000	300,000
Non-Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 2,609,000	$ 0
Financing Receivable, Modifications, Number of Contracts | loan	0	0	4	0
Financing Receivable, Gross	$ 3,038,137,000		$ 3,038,137,000			2,750,446,000
Non-Covered Loans | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Post-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts | loan	0	0	0	0
Financing Receivable, Gross	$ 160,535,000		$ 160,535,000			$ 137,537,000

Portfolio Loans - Summary of 40

Portfolio Loans - Summary of Recorded Investment in Impaired Portfolio Loans by Category (Details) - Non-Covered Loans - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 18,107,000	$ 9,680,000
Restructured	2,331,000	307,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	0
Total Recorded Investment	20,438,000	9,987,000
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	10,959,000	4,406,000
Restructured	2,311,000	307,000
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	0
Total Recorded Investment	13,270,000	4,713,000
Commercial - investor owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	253,000	927,000
Restructured	0	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	0
Total Recorded Investment	253,000	927,000
Commercial - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	198,000
Restructured	0	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	0
Total Recorded Investment	0	198,000
Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,258,000	3,444,000
Restructured	20,000	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	0
Total Recorded Investment	2,278,000	3,444,000
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	129,000	705,000
Restructured	0	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	0
Total Recorded Investment	129,000	705,000
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	4,508,000	0
Restructured	0	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	0
Total Recorded Investment	$ 4,508,000	$ 0

Portfolio Loans - Summary of 41

Portfolio Loans - Summary of Recorded Investment by Category for Portfolio Loans Restructured (Details) - Non-Covered Loans $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)loan	Sep. 30, 2015USD ($)loan	Sep. 30, 2016USD ($)loan	Sep. 30, 2015USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	4	0
Pre-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 2,609	$ 0
Post-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 2,609	$ 0
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	2	0
Pre-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 2,341	$ 0
Post-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 2,341	$ 0
CRE - owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	0	0
Pre-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 0	$ 0
Commercial Real Estate Investor Owned
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	1	0
Pre-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 248	$ 0
Post-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 248	$ 0
Construction and land development
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	1	0
Pre-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 20	$ 0
Post-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 20	$ 0
Residential real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	0	0
Pre-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 0	$ 0
Consumer and other
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0	0	0
Pre-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Balance	$ 0	$ 0	$ 0	$ 0

Portfolio Loans - Summary of 42

Portfolio Loans - Summary of Recorded Investment by Category for Portfolio Loans Restructured and Subsequently Defaulted (Details) - Non-Covered Loans - loan	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0	4	0
Commercial and industrial
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0	2	0
CRE - owner occupied
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0	0	0
Commercial Real Estate Investor Owned
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0	1	0
Construction and land development
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0	1	0
Consumer and other
Schedule of Financing Receivables, Troubled Debt Restructurings - Suibsequent Defaults [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0	0	0

Portfolio Loans - Summary of Ag

Portfolio Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Gross	$ 3,037,705	$ 2,750,737
Non-Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	434	1,537
90 or More Days Past Due	1,953	4,026
Total Past Due	2,387	5,563
Current	3,035,318	2,745,174
Loans and Leases Receivable, Gross	3,037,705	2,750,737
Total	3,038,137	2,750,446
Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	505
90 or More Days Past Due	364	888
Total Past Due	364	1,393
Current	1,598,451	1,482,934
Total	1,598,815	1,484,327
Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	225	94
90 or More Days Past Due	0	184
Total Past Due	225	278
Current	340,691	342,681
Total	340,916	342,959
Non-Covered Loans | Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	136	464
90 or More Days Past Due	0	0
Total Past Due	136	464
Current	514,919	427,600
Total	515,055	428,064
Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	384
90 or More Days Past Due	1,529	2,273
Total Past Due	1,529	2,657
Current	187,327	158,404
Total	188,856	161,061
Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	73	70
90 or More Days Past Due	60	681
Total Past Due	133	751
Current	233,827	195,747
Total	233,960	196,498
Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	20
90 or More Days Past Due	0	0
Total Past Due	0	20
Current	160,103	137,808
Loans and Leases Receivable, Gross	160,103	137,828
Total	$ 160,535	$ 137,537

Portfolio Loans - Summary of 44

Portfolio Loans - Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	$ 3,037,705	$ 2,750,737
Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	3,038,137	2,750,446
Loans and Leases Receivable, Gross	3,037,705	2,750,737
Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	1,598,815	1,484,327
Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	340,916	342,959
Non-Covered Loans | Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	515,055	428,064
Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	188,856	161,061
Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	233,960	196,498
Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	160,535	137,537
Loans and Leases Receivable, Gross	160,103	137,828
Pass (1-6) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	2,829,644	2,541,405
Pass (1-6) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	1,457,729	1,356,864
Pass (1-6) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	311,427	314,791
Pass (1-6) | Non-Covered Loans | Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	501,228	403,820
Pass (1-6) | Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	179,515	146,601
Pass (1-6) | Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	226,287	188,269
Pass (1-6) | Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	153,458	131,060
Watch (7) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	109,475	149,938
Watch (7) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	63,572	90,370
Watch (7) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	25,369	24,727
Watch (7) | Non-Covered Loans | Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	9,549	18,868
Watch (7) | Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	6,050	10,114
Watch (7) | Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	4,224	5,138
Watch (7) | Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	711	721
Substandard (8) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	98,586	59,394
Substandard (8) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	77,514	37,093
Substandard (8) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	4,120	3,441
Substandard (8) | Non-Covered Loans | Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	4,278	5,376
Substandard (8) | Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	3,291	4,346
Substandard (8) | Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	3,449	3,091
Substandard (8) | Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	5,934	6,047
Doubtful (9) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	0	0
Doubtful (9) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	0	0
Doubtful (9) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	0	0
Doubtful (9) | Non-Covered Loans | Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	0	0
Doubtful (9) | Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	0	0
Doubtful (9) | Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	0	0
Doubtful (9) | Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans	$ 0	$ 0

Purchased Credit Impaired ("P45

Purchased Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands	Jun. 30, 2016USD ($)rating	Dec. 31, 2015USD ($)rating
Covered Loans [Line Items]
Recorded Investment PCI Loans	$ 47,449	$ 74,758
Construction and land development
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	5.67	6.28
Recorded Investment PCI Loans	$ 4,919	$ 6,838
Commercial Real Estate Investor Owned
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.94	6.98
Recorded Investment PCI Loans	$ 14,595	$ 25,272
CRE - owner occupied
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.34	6.30
Recorded Investment PCI Loans	$ 12,417	$ 19,414
Residential real estate
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	5.66	5.44
Recorded Investment PCI Loans	$ 12,173	$ 19,287
Total real estate loans
Covered Loans [Line Items]
Recorded Investment PCI Loans	$ 44,104	$ 70,811
Commercial and industrial
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	5.84	6.70
Recorded Investment PCI Loans	$ 3,282	$ 3,863
Consumer and other
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	1.54	1.89
Recorded Investment PCI Loans	$ 63	$ 84

Purchased Credit Impaired ("P46

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, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	$ 1,118	$ 4,671
90 or More Days Past Due	55	3,791
Total Past Due	1,173	8,462
Current	46,276	66,296
Total	47,449	74,758
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	805	0
90 or More Days Past Due	0	0
Total Past Due	805	0
Current	2,477	3,863
Total	3,282	3,863
CRE - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	229	731
90 or More Days Past Due	0	0
Total Past Due	229	731
Current	12,188	18,683
Total	12,417	19,414
Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	2,342
90 or More Days Past Due	0	3,661
Total Past Due	0	6,003
Current	14,595	19,269
Total	14,595	25,272
Construction and land development
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	4,919	6,838
Total	4,919	6,838
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	84	1,594
90 or More Days Past Due	55	130
Total Past Due	139	1,724
Current	12,034	17,563
Total	12,173	19,287
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	4
90 or More Days Past Due	0	0
Total Past Due	0	4
Current	63	80
Total	$ 63	$ 84

Purchased Credit Impaired ("P47

Purchased Credit Impaired ("PCI") Loans - Rollforward of PCI Loans, Net of Allowance for Loan Losses (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 64,583	$ 83,693
Principal reductions and interest payments	(20,417)	(19,315)
Accretion of loan discount	4,984	8,604
Changes in contractual and expected cash flows due to remeasurement	(9,262)	(11,833)
Reductions due to disposals	(17,396)	(12,418)
Balance at end of period	41,016	72,397
Contractual Cashflows
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	116,689	178,145
Principal reductions and interest payments	(20,417)	(19,315)
Accretion of loan discount	0	0
Changes in contractual and expected cash flows due to remeasurement	(9,194)	(5,731)
Reductions due to disposals	(27,888)	(19,734)
Balance at end of period	77,578	133,365
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	26,765	65,719
Principal reductions and interest payments	0	0
Accretion of loan discount	0	0
Changes in contractual and expected cash flows due to remeasurement	(975)	(26,797)
Reductions due to disposals	(6,779)	(4,183)
Balance at end of period	20,961	34,739
Accretable Yield
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	25,341	28,733
Principal reductions and interest payments	0	0
Accretion of loan discount	4,984	8,604
Changes in contractual and expected cash flows due to remeasurement	(1,043)	(9,233)
Reductions due to disposals	(3,713)	(3,133)
Balance at end of period	$ 15,601	$ 26,229

Purchased Credit Impaired ("P48

Purchased Credit Impaired ("PCI") Loans - Summary of FDIC Loss Share Receivable (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
FDIC Indemnification Asset [Roll Forward]
Cash received from the FDIC for covered assets	$ 0	$ (1,725)

Purchased Credit Impaired ("P49

Purchased Credit Impaired ("PCI") Loans - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Receivables [Abstract]
PCI loans outstanding	$ 64.6	$ 98.6

Derivative Financial Instrume50

Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Risk Management [Member]
Summary of Derivative Instruments [Abstract]
Notional Amount	$ 3,500	$ 3,500
Derivative, Fair Value, Net	0	0
Non-designated hedging instruments | Client-Related | Interest rate swap contracts
Summary of Derivative Instruments [Abstract]
Notional Amount	171,792	153,630
Non-designated hedging instruments | Client-Related | Other Assets | Interest rate swap contracts
Summary of Derivative Instruments [Abstract]
Asset derivatives (other assets), fair value	2,099	1,155
Non-designated hedging instruments | Client-Related | Other Liabilities | Interest rate swap contracts
Summary of Derivative Instruments [Abstract]
Liability derivatives (other liabilities), fair value	$ 2,099	$ 1,155

Commitments (Details)

Commitments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Schedule of Commitments [Line Items]
Unadvanced commitments on impaired loans	$ 500		$ 0
Commitments to extend credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	1,086,372		1,140,028
Standby letters of credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	$ 64,360		54,648
Standby letters of credit | Maximum
Schedule of Commitments [Line Items]
Remaining term	5 years
Standby 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		$ 300	300
Fixed Rate Loan Commitment | Commitments to extend credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	$ 107,500		$ 93,900

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Assets
Securities available for sale	$ 479,609	$ 451,770
State tax credits held for sale	$ 4,801	5,941
Liabilities
State tax credit term	10 years
Years of tax credits generated	10 years
Portion at Other than Fair Value, Fair Value Disclosure
Assets
State tax credits held for sale	$ 39,400
Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	479,609	451,770
State tax credits held for sale	48,959	49,588
Derivative financial instruments	2,099	1,155
Liabilities
Derivative financial instruments	2,099	1,155
Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	99,058	99,008
Obligations of states and political subdivisions
Assets
Securities available for sale	38,336	41,701
Residential mortgage-backed securities
Assets
Securities available for sale	342,215	311,061
Recurring basis | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	479,609	451,770
State tax credits held for sale	4,801	5,941
Derivative financial instruments	2,099	1,155
Total assets	486,509	458,866
Liabilities
Derivative financial instruments		1,155
Total liabilities	2,099	1,155
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	99,058	99,008
Recurring basis | Obligations of states and political subdivisions | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	38,336	41,701
Recurring basis | Residential mortgage-backed securities | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	342,215	311,061
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
Derivative financial instruments	0	0
Total assets	0	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 | Significant Other Observable Inputs (Level 2)
Assets
Securities available for sale	476,515	448,693
State tax credits held for sale	0	0
Derivative financial instruments	2,099	1,155
Total assets	478,614	449,848
Liabilities
Derivative financial instruments	2,099	1,155
Total liabilities	2,099	1,155
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	99,058	99,008
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions
Assets
Securities available for sale	35,242	38,624
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
Assets
Securities available for sale	342,215	311,061
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	3,094	3,077
State tax credits held for sale	4,801	5,941
Derivative financial instruments	0	0
Total assets	7,895	9,018
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	3,094	3,077
Recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities
Assets
Securities available for sale	$ 0	$ 0

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)security	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)security	Sep. 30, 2015USD ($)	Jun. 30, 2016	Dec. 31, 2015USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State tax credits held for sale, including $4,774 and $5,941 carried at fair value, respectively	$ 44,180		$ 44,180			$ 45,850
Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State tax credits held for sale, including $4,774 and $5,941 carried at fair value, respectively	$ 44,200		$ 44,200
Auction Rate Securities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of available-for-sale securities | security	3		3
State tax credits held for sale, at fair value | Recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in unrealized gains (losses) relating to assets still held at the reporting date	$ 27	$ (124)	$ (237)	$ 186
LIBOR | LIBOR Swap Curve [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate basis spread on variable rate					205.00%
LIBOR Swap Curve [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate basis point spread			205

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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Securities available for sale, at fair value
Level 3 Financial Instruments Measured at Fair Value
Beginning balance	$ 3,093	$ 3,070	$ 3,077	$ 3,059
Total gains:
Included in other comprehensive income	1	7	17	18
Purchases, sales, issuances and settlements:
Purchases	0	0	0	0
Ending balance	3,094	3,077	3,094	3,077
Change in unrealized gains (losses) relating to assets still held at the reporting date	(1)	(7)	(17)	(18)
State tax credits held for sale, at fair value
Level 3 Financial Instruments Measured at Fair Value
Beginning balance	4,774	9,965	5,941	11,689
Total gains:
Total gains:	27	124	144	318
Purchases, sales, issuances and settlements:
Sales	0	0	(1,284)	(1,918)
Ending balance	4,801	10,089	4,801	10,089
Change in unrealized gains (losses) relating to assets still held at the reporting date	$ 27	$ (124)	$ (237)	$ 186

Fair Value Measurements - Sum55

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	9 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2016USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total (losses) gains for the year	$ 2,073	$ 2,310
Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total (losses) gains for the year	2,073	2,309
Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total (losses) gains for the year	0	1
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	357	357
Significant Unobservable Inputs (Level 3) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	357	357
Significant Unobservable Inputs (Level 3) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	0	0
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	357	357
Estimate of Fair Value Measurement [Member] | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	357	357
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	$ 0	$ 0

Fair Value Measurements - Sum56

Fair Value Measurements - Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Balance sheet assets
Securities available for sale	$ 479,609	$ 451,770
Securities held to maturity	41,031	43,714
State tax credits held for sale	4,801	5,941
Carrying Amount
Balance sheet assets
Cash and due from banks	56,789	47,935
Federal funds sold	488	91
Interest-bearing deposits	63,202	47,131
Securities available for sale	479,609	451,770
Securities held to maturity	41,031	43,714
Other investments, at cost	19,789	17,455
Loans held for sale	7,663	6,598
Derivative financial instruments	2,099	1,155
Portfolio loans, net	3,041,223	2,781,879
State tax credits held for sale	44,180	45,850
Accrued interest receivable	8,526	8,399
Balance sheet liabilities
Deposits	3,124,825	2,784,591
Subordinated debentures	56,807	56,807
Federal Home Loan Bank advances	129,000	110,000
Other borrowings	190,022	270,326
Derivative financial instruments	2,099	1,155
Accrued interest payable	648	629
Estimated fair value
Balance sheet assets
Cash and due from banks	56,789	47,935
Federal funds sold	488	91
Interest-bearing deposits	63,202	47,131
Securities available for sale	479,609	451,770
Securities held to maturity	42,218	43,441
Other investments, at cost	19,789	17,455
Loans held for sale	7,663	6,598
Derivative financial instruments	2,099	1,155
Portfolio loans, net	3,045,230	2,782,704
State tax credits held for sale	48,959	49,588
Accrued interest receivable	8,526	8,399
Balance sheet liabilities
Deposits	3,126,534	2,784,654
Subordinated debentures	36,275	35,432
Federal Home Loan Bank advances	128,996	109,994
Other borrowings	189,996	270,286
Derivative financial instruments	2,099	1,155
Accrued interest payable	$ 648	$ 629

Fair Value Measurements - Sch57

Fair Value Measurements - Schedule of Estimated Fair Values of Financial Instruments Not Recorded at Fair Value on Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
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	$ 42,218	$ 43,441
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	3,045,230	2,782,704
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	44,158	43,647
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	3,126,534	2,784,654
Estimated fair value | Subordinated debentures
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	36,275	35,432
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	128,996	109,994
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	189,996	270,286
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	2,636,980	2,428,403
Level 1 | Subordinated debentures
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	42,218	43,441
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
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	36,275	35,432
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	128,996	109,994
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	189,996	270,286
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	3,045,230	2,782,704
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	44,158	43,647
Level 3 | Deposits
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	489,554	356,251
Level 3 | Subordinated debentures
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