Enterprise Financial Services (EFSC) 10-Q 30 Apr 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 27, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	ENTERPRISE FINANCIAL SERVICES CORP
Entity Central Index Key	1025835
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		19,935,455

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Assets
Cash and due from banks	$56,420	$42,903
Federal funds sold	48	35
Interest-bearing deposits (including $980 and $980 pledged as collateral)	42,865	57,758
Total cash and cash equivalents	99,333	100,696
Interest-bearing deposits greater than 90 days	1,000	5,300
Securities available for sale	410,061	400,146
Securities held to maturity	45,563	45,985
Loans held for sale	7,843	4,033
Portfolio loans	2,435,559	2,433,916
Less: Allowance for loan losses	30,288	30,185
Portfolio loans, net	2,405,271	2,403,731
Purchase credit impaired loans, net of the allowance for loan losses ($11,625 and $15,410, respectively)	83,163	83,693
Total loans, net	2,488,434	2,487,424
Other real estate not covered under FDIC loss share	2,024	1,896
Other real estate covered under FDIC loss share	3,560	5,944
Other investments, at cost	11,719	17,037
Fixed assets, net	14,911	14,753
Accrued interest receivable	8,061	7,956
State tax credits held for sale, including $10,286 and $11,689 carried at fair value, respectively	42,411	38,309
FDIC loss share receivable	11,644	15,866
Goodwill	30,334	30,334
Intangible assets, net	3,880	4,164
Other assets	94,517	97,160
Total assets	3,275,295	3,277,003
Liabilities and Shareholders' Equity
Demand deposits	680,997	642,930
Interest-bearing transaction accounts	494,228	508,941
Money market accounts	848,139	755,569
Savings	85,769	78,718
Certificates of deposit:
$100 and over	441,775	377,544
Other	123,723	127,808
Total deposits	2,674,631	2,491,510
Subordinated debentures	56,807	56,807
Federal Home Loan Bank advances	6,000	144,000
Other borrowings	181,164	234,183
Notes payable	5,700	5,700
Accrued interest payable	845	843
Other liabilities	24,039	27,719
Total liabilities	2,949,186	2,960,762
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; 20,011,455 and 19,913,519 shares issued, respectively	200	199
Treasury stock, at cost; 76,000 shares	-1,743	-1,743
Additional paid in capital	207,605	207,731
Retained earnings	116,668	108,373
Accumulated other comprehensive income	3,379	1,681
Total shareholders' equity	326,109	316,241
Total liabilities and shareholders' equity	$3,275,295	$3,277,003

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Assets
Collateral pledged	$980	$980
Allowance for loan losses on Portfolio loans, covered under FDIC loss share	11,625	15,410
State tax credits, held for sale, carried at fair value	$10,286	$11,689
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	20,011,455	19,913,519
Treasury stock, shares	76,000	76,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest income:
Interest and fees on loans	$29,608	$31,444
Interest on debt securities:
Taxable	2,141	2,166
Nontaxable	297	299
Interest on interest-bearing deposits	47	66
Dividends on equity securities	58	49
Total interest income	32,151	34,024
Interest expense:
Interest-bearing transaction accounts	277	112
Money market accounts	642	742
Savings accounts	50	49
Certificates of deposit:
$100 and over	1,226	1,326
Other	365	424
Subordinated debentures	302	407
Federal Home Loan Bank advances	49	399
Notes payable and other borrowings	195	199
Total interest expense	3,106	3,658
Net interest income	29,045	30,366
Provision for portfolio loan losses	1,580	1,027
Provision (provision reversal) for purchase credit impaired loan losses	-3,270	3,304
Net interest income after provision for loan losses	30,735	26,035
Noninterest income:
Wealth management revenue	1,740	1,722
Service charges on deposit accounts	1,856	1,738
Other service charges and fee income	753	637
Gain on sale of other real estate	20	683
Gain on state tax credits, net	674	497
Gain on sale of investment securities	23	0
Change in FDIC loss share receivable	-2,264	-2,410
Miscellaneous income	781	1,055
Total noninterest income	3,583	3,922
Noninterest expense:
Employee compensation and benefits	11,513	12,116
Occupancy	1,694	1,640
Data processing	1,030	1,126
FDIC and other insurance	726	699
Loan legal and other real estate expense	278	1,134
Professional fees	972	1,267
FHLB prepayment penalty	412	-111
Other	3,325	3,231
Total noninterest expense	19,950	21,102
Income before income tax expense	14,368	8,855
Income tax expense	5,022	3,007
Net income	$9,346	$5,848
Earnings per common share
Basic (usd per share)	$0.47	$0.30
Diluted (usd per share)	$0.46	$0.30

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$9,346	$5,848
Other comprehensive income, net of tax:
Unrealized gains on investment securities arising during the period, net of income tax expense of $1,045, and $1,091, respectively	1,712	1,757
Less: Reclassification adjustment for realized gains on sale of securities available for sale included in net income, net of income tax expense of $9, and $0, respectively	-14	0
Total other comprehensive income (loss)	1,698	1,757
Total comprehensive income	$11,044	$7,605

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Other comprehensive income, tax:
Unrealized (loss)/gain on investment securities available for sale arising during the period, tax	$1,045	$1,091
Reclassification adjustment for realized gains on sale of securities available for sale included in net income, tax	$9	$0

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Shareholders' Equity (USD $)	Total	Preferred Stock	Common Stock	Treasury Stock	Additional paid in capital	Retained earnings	Accumulated other comprehensive income (loss)	Parent [Member]
In Thousands, unless otherwise specified
Balance at Dec. 31, 2013		$0	$194	($1,743)	$200,258	$85,376	($4,380)	$279,705
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,848	0	0	0	0	5,848	0	5,848
Other comprehensive income	1,757	0	0	0	0	0	1,757	1,757
Cash dividends paid on common shares, $0.0525 per share		0	0	0	0	-1,043	0	-1,043
Issuance under equity compensation plans, net		0	1	0	-630	0	0	-629
Trust preferred securities conversion		0	3	0	4,999	0	0	5,002
Share-based compensation		0	0	0	735	0	0	735
Excess tax benefit related to equity compensation plans		0	0	0	74	0	0	74
Balance at Mar. 31, 2014		0	198	-1,743	205,436	90,181	-2,623	291,449
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	9,346	0	0	0	0	9,346	0	9,346
Other comprehensive income	1,698	0	0	0	0	0	1,698	1,698
Cash dividends paid on common shares, $0.0525 per share		0	0	0	0	-1,051	0	-1,051
Issuance under equity compensation plans, net		0	1	0	-1,047	0	0	-1,046
Share-based compensation		0	0	0	768	0	0	768
Excess tax benefit related to equity compensation plans		0	0	0	153	0	0	153
Balance at Mar. 31, 2015	$326,109	$0	$200	($1,743)	$207,605	$116,668	$3,379	$326,109

Condensed_Consolidated_Stateme4

Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash dividends paid on common shares, per share	$0.21	$0.21	$0.21
Issuance under equity compensation plans, shares	225,958	135,087	238,290
Stock Issued During Period, Shares, Conversion of Convertible Securities	287,852	1,176,470	0

Condensed_Consolidated_Stateme5

Condensed Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$9,346	$5,848
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	489	533
Provision for loan losses	-1,690	4,331
Deferred income taxes	-152	1,032
Net amortization of debt securities	851	951
Amortization of intangible assets	284	383
Gain on sale of investment securities	-23	0
Mortgage loans originated for sale	-31,603	-10,050
Proceeds from mortgage loans sold	27,767	10,008
Gain on sale of other real estate	-20	-683
Gain on state tax credits, net	-674	-497
Excess tax benefit of share-based compensation	-153	-74
Share-based compensation	768	735
Valuation adjustment on other real estate	41	344
Net accretion of loan discount and indemnification asset	-1,390	-4,096
Changes in:
Accrued interest receivable	-104	-173
Accrued interest payable	2	-83
Other assets	-1,666	-6,621
Other liabilities	-3,681	-9,285
Net cash used by operating activities	-1,608	-7,397
Cash flows from investing activities:
Net decrease (increase) in loans	3,443	-23,344
Net cash proceeds received from FDIC loss share receivable	1,395	2,255
Proceeds from the sale of securities, available for sale	41,069	0
Proceeds from the paydown or maturity of securities, available for sale	10,715	10,278
Proceeds from the paydown or maturity of securities, held to maturity	515	0
Proceeds from the redemption of other investments	19,593	1,118
Proceeds from the sale of state tax credits held for sale	4,066	3,294
Proceeds from the sale of other real estate	2,896	3,014
Payments for the purchase/origination of:
Available for sale debt and equity securities	-59,869	-29,853
Other investments	-9,975	-3,457
State tax credits held for sale	-3,112	0
Fixed assets	-648	-381
Net cash provided (used) by investing activities	10,088	-37,076
Cash flows from financing activities:
Net increase (decrease) in noninterest-bearing deposit accounts	38,066	-40,971
Net increase (decrease) in interest-bearing deposit accounts	145,054	-41,863
Proceeds from Federal Home Loan Bank advances	302,000	80,000
Repayments of Federal Home Loan Bank advances	-440,000	0
Proceeds from notes payable	0	-3,900
Net decrease in other borrowings	-53,019	-20,113
Cash dividends paid on common stock	-1,051	-1,043
Excess tax benefit of share-based compensation	153	74
Proceeds from the issuance of equity instruments, net	-1,046	-629
Net cash used by financing activities	-9,843	-28,445
Net decrease in cash and cash equivalents	-1,363	-72,918
Cash and cash equivalents, beginning of period	100,696	210,569
Cash and cash equivalents, end of period	99,333	137,651
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	3,105	3,741
Cash paid during the period for income taxes	3,500	8,549
Noncash transactions:
Transfer to other real estate owned in settlement of loans	890	4,721
Sales of other real estate financed	0	495
Issuance of common stock from Trust Preferred Securities conversion	$0	$5,002

Summary_of_Significant_Account

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
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 months ended March 31, 2015 are not necessarily indicative of the results that may be expected for any other interim period or for the year ending December 31, 2015. 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, 2014.
	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 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	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE
	Basic earnings per common share data is calculated by dividing net income available to common shareholders 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 and the if-converted method for convertible trust preferred securities.
	The following table presents a summary of per common share data and amounts for the periods indicated.
		Three months ended March 31,
	(in thousands, except per share data)	2015		2014
	Net income as reported	$	9,346	$	5,848
	Impact of assumed conversions
	Interest on 9% convertible trust preferred securities, net of income tax	—		66
	Net income available to common shareholders and assumed conversions	$	9,346	$	5,914
	Weighted average common shares outstanding	19,934		19,521
	Incremental shares from assumed conversions of convertible trust preferred securities	—		230
	Additional dilutive common stock equivalents	223		198
	Weighted average diluted common shares outstanding	$	20,157	$	19,949
	Basic earnings per common share:	$	0.47	$	0.3
	Diluted earnings per common share:	$	0.46	$	0.3
	The calculation of diluted earnings per common share for the three months ended March 31, 2015, and 2014, excludes the impact of 0.3 million common stock equivalents, because their effect was anti-dilutive.

Investments

Investments	3 Months Ended
	Mar. 31, 2015
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:
		March 31, 2015
	(in thousands)	Amortized Cost			Gross		Gross			Fair Value
					Unrealized Gains		Unrealized Losses
	Available for sale securities:
	Obligations of U.S. Government-sponsored enterprises	$	99,643		$	1,256	$	—		$	100,899
	Obligations of states and political subdivisions	33,965			1,441		(359		)	35,047
	Agency mortgage-backed securities	270,455			4,470		(810		)	274,115
	Total securities available for sale	$	404,063		$	7,167	$	(1,169	)	$	410,061
	Held to maturity securities:
	Obligations of states and political subdivisions	$	14,883		$	2	$	(109	)	$	14,776
	Agency mortgage-backed securities	30,680			355		—			31,035
	Total securities held to maturity	$	45,563		$	357	$	(109	)	$	45,811
		December 31, 2014
	(in thousands)	Amortized Cost			Gross		Gross			Fair Value
					Unrealized Gains		Unrealized Losses
	Available for sale securities:
	Obligations of U.S. Government-sponsored enterprises	$	91,355		$	624	$	(153	)	$	91,826
	Obligations of states and political subdivisions	33,997			1,300		(416		)	34,881
	Agency mortgage-backed securities	271,430			3,577		(1,568		)	273,439
	Total securities available for sale	$	396,782		$	5,501	$	(2,137	)	$	400,146
	Held to maturity securities:
	Obligations of states and political subdivisions	$	14,900		$	—	$	(325	)	$	14,575
	Agency mortgage-backed securities	31,085			150		(15		)	31,220
	Total securities held to maturity	$	45,985		$	150	$	(340	)	$	45,795
	At March 31, 2015, and December 31, 2014, there were no holdings of securities of any one issuer in an amount greater than 10% of shareholders’ equity, other than the 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 $251.4 million and $315.8 million at March 31, 2015, and December 31, 2014, 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 March 31, 2015, 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	$	4,331		$	4,382	$	—		$	—
	Due after one year through five years	100,610			102,383		662			664
	Due after five years through ten years	25,767			26,561		12,963			12,875
	Due after ten years	2,900			2,620		1,258			1,237
	Mortgage-backed securities	270,455			274,115		30,680			31,035
		$	404,063		$	410,061	$	45,563		$	45,811
	The following table represents a summary of investment securities that had an unrealized loss:
		March 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 U.S. Government-sponsored enterprises	$	—		$	—	$	—		$	—	$	—	$	—
	Obligations of states and political subdivisions	14,982			127		4,321			341		19,303		468
	Agency mortgage-backed securities	28,750			179		21,868			631		50,618		810
		$	43,732		$	306	$	26,189		$	972	$	69,921	$	1,278
		December 31, 2014
		Less than 12 months					12 months or more					Total
	(in thousands)	Fair Value			Unrealized Losses		Fair Value			Unrealized Losses		Fair Value		Unrealized Losses
	Obligations of U.S. Government-sponsored enterprises	$	5,399		$	10	$	24,852		$	143	$	30,251	$	153
	Obligations of states and political subdivisions	16,827			343		5,349			398		22,176		741
	Agency mortgage-backed securities	26,367			56		97,054			1,527		123,421		1,583
		$	48,593		$	409	$	127,255		$	2,068	$	175,848	$	2,477
	The unrealized losses at both March 31, 2015, and December 31, 2014, 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 that the Company would be required to sell the security before its anticipated recovery in market value. At March 31, 2015, 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 March 31,
	(in thousands)	2015			2014
	Gross gains realized	$	63		$	—
	Gross losses realized	(40		)	—
	Proceeds from sales	41,069			—

Portfolio_Loans

Portfolio Loans	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Portfolio Loans	PORTFOLIO LOANS
	Below is a summary of Portfolio loans by category at March 31, 2015 and December 31, 2014:
	(in thousands)	March 31, 2015				December 31, 2014
	Real estate loans:
	Construction and land development	$	138,924			$	144,773
	Commercial - Investor Owned	413,170				413,026
	Commercial - Owner Occupied	368,313				357,503
	Residential real estate	180,253				185,252
	Total real estate loans	1,100,660				1,100,554
	Commercial and industrial	1,265,104				1,270,259
	Consumer and other	68,830				62,208
	Portfolio loans	2,434,594				2,433,021
	Unearned loan costs, net	965				895
	Portfolio loans, including unearned loan costs	$	2,435,559			$	2,433,916
	A summary of the year-to-date activity in the allowance for loan losses and the recorded investment in Portfolio loans by class and category based on impairment method through March 31, 2015, and at December 31, 2014, is as follows:
	(in thousands)	Commercial & Industrial				Commercial				Commercial				Construction and Land Development				Residential Real Estate				Consumer & Other			Total
						Real Estate				Real Estate
						Owner Occupied				Investor Owned
	Allowance for Loan Losses:
	Balance at	$	17,004			$	3,625			$	4,598			$	1,720			$	2,830			$	408		$	30,185
	31-Dec-14
	Provision charged to expense	823				(175		)		(12		)		914				74				(44		)	1,580
	Losses charged off	(1,484		)		—				—				—				(1,073		)		(11		)	(2,568		)
	Recoveries	769				127				29				60				26				80			1,091
	Balance at	$	17,112			$	3,577			$	4,615			$	2,694			$	1,857			$	433		$	30,288
	31-Mar-15
	(in thousands)	Commercial & Industrial				Commercial				Commercial				Construction and Land Development				Residential Real Estate				Consumer & Other			Total
						Real Estate				Real Estate
						Owner Occupied				Investor Owned
	Balance March 31, 2015
	Allowance for Loan Losses - Ending Balance:
	Individually evaluated for impairment	$	1,196			$	297			$	—			$	1,370			$	—			$	—		$	2,863
	Collectively evaluated for impairment	15,916				3,280				4,615				1,324				1,857				433			27,425
	Total	$	17,112			$	3,577			$	4,615			$	2,694			$	1,857			$	433		$	30,288
	Loans - Ending Balance:
	Individually evaluated for impairment	$	4,250			$	3,380			$	581			$	6,366			$	2,655			$	—		$	17,232
	Collectively evaluated for impairment	1,260,854				364,933				412,589				132,558				177,598				69,795			2,418,327
	Total	$	1,265,104			$	368,313			$	413,170			$	138,924			$	180,253			$	69,795		$	2,435,559
	Balance December 31, 2014
	Allowance for Loan Losses - Ending Balance:
	Individually evaluated for impairment	$	704			$	286			$	—			$	352			$	1,052			$	—		$	2,394
	Collectively evaluated for impairment	16,300				3,339				4,598				1,368				1,778				408			27,791
	Total	$	17,004			$	3,625			$	4,598			$	1,720			$	2,830			$	408		$	30,185
	Loans - Ending Balance:
	Individually evaluated for impairment	$	5,998			$	3,384			$	5,036			$	6,866			$	3,082			$	—		$	24,366
	Collectively evaluated for impairment	1,264,261				354,119				407,990				137,907				182,170				63,103			2,409,550
	Total	$	1,270,259			$	357,503			$	413,026			$	144,773			$	185,252			$	63,103		$	2,433,916
	A summary of Portfolio loans individually evaluated for impairment by category at March 31, 2015 and December 31, 2014, is as follows:
		March 31, 2015
	(in thousands)	Unpaid				Recorded				Recorded				Total				Related Allowance				Average
		Contractual				Investment				Investment				Recorded Investment								Recorded Investment
		Principal Balance				With No Allowance				With
										Allowance
	Commercial and industrial	$	5,141			$	3,223			$	1,068			$	4,291			$	1,196			$	8,956
	Real estate:
	Commercial - Owner occupied	1,383				759				560				1,319				297				649
	Commercial - Investor owned	581				—				581				581				—				632
	Construction and land development	7,271				3,881				2,973				6,854				1,370				6,682
	Residential	3,707				—				2,696				2,696				—				2,940
	Consumer and other	—				—				—				—				—				759
	Total	$	18,083			$	7,863			$	7,878			$	15,741			$	2,863			$	20,618
		December 31, 2014
	(in thousands)	Unpaid				Recorded				Recorded				Total				Related Allowance				Average
		Contractual				Investment				Investment				Recorded Investment								Recorded Investment
Principal Balance			With No Allowance			With
						Allowance
Commercial and industrial	$	8,042			$	2,609			$	3,464			$	6,073			$	704			$	4,136
Real estate:
Commercial - Owner occupied	1,376				770				519				1,289				286				1,281
Commercial - Investor owned	5,036				—				5,187				5,187				—				4,375
Construction and land development	7,961				419				6,929				7,348				352				7,280
Residential	3,082				2,943				150				3,093				1,052				954
Consumer and other	—				—				—				—				—				581
Total	$	25,497			$	6,741			$	16,249			$	22,990			$	2,394			$	18,607
The following table presents details for past due and impaired loans:
	For the three months ended
(in thousands)	31-Mar-15				31-Mar-14
Total interest income that would have been recognized under original terms	$	315			$	320
Total cash received and recognized as interest income on non-accrual loans	27				9
Total interest income recognized on impaired loans	13				6
There were no loans over 90 days past due and still accruing interest at March 31, 2015 or December 31, 2014. At March 31, 2015, there were no unadvanced commitments on impaired loans. Other liabilities include approximately $0.2 million for estimated losses attributable to the unadvanced commitments.
The recorded investment in impaired Portfolio loans by category at March 31, 2015 and December 31, 2014, is as follows:
	March 31, 2015
(in thousands)	Non-accrual				Restructured				Loans over 90 days past due and still accruing interest				Total
Commercial and industrial	$	4,291			$	—			$	—			$	4,291
Real estate:
Commercial - Investor owned	—				581				—				581
Commercial - Owner occupied	560				759				—				1,319
Construction and land development	6,854				—				—				6,854
Residential	2,696				—				—				2,696
Consumer and other	—				—				—				—
Total	$	14,401			$	1,340			$	—			$	15,741
	December 31, 2014
(in thousands)	Non-accrual				Restructured				Loans over 90 days past due and still accruing interest				Total
Commercial and industrial	$	6,073			$	—			$	—			$	6,073
Real estate:
Commercial - Investor owned	4,597				590				—				5,187
Commercial - Owner occupied	519				770				—				1,289
Construction and land development	7,348				—				—				7,348
Residential	3,093				—				—				3,093
Consumer and other	—				—				—				—
Total	$	21,630			$	1,360			$	—			$	22,990
The recorded investment by category for the Portfolio loans that have been restructured during the three months ended March 31, 2015 and 2014, is as follows:
	Three months ended March 31, 2015											Three months ended March 31, 2014
(in thousands, except for number of loans)	Number of Loans			Pre-Modification Outstanding				Post-Modification Outstanding				Number of Loans			Pre-Modification Outstanding				Post-Modification Outstanding
				Recorded Balance				Recorded Balance							Recorded Balance				Recorded Balance
Commercial and industrial	—			$	—			$	—			—			$	—			$	—
Real estate:
Commercial - Owner occupied	—			—				—				2			1,292				1,042
Commercial - Investor owned	—			—				—				—			—				—
Construction and land development	—			—				—				—			—				—
Residential	—			—				—				—			—				—
Consumer and other	—			—				—				—			—				—
Total	—			$	—			$	—			2			$	1,292			$	1,042
The restructured Portfolio loans primarily resulted from interest rate concessions and changing the terms of the loans. As of March 31, 2015, the Company allocated $0.3 million of specific reserves to the loans that have been restructured.
There were no Portfolio loans that were restructured and subsequently defaulted during the three months ended March 31, 2015 or 2014.
The aging of the recorded investment in past due Portfolio loans by portfolio class and category at March 31, 2015 and December 31, 2014 is shown below.
	March 31, 2015
(in thousands)	30-89 Days				90 or More				Total				Current				Total
	Past Due				Days				Past Due
					Past Due
Commercial and industrial	$	2,931			$	932			$	3,863			$	1,261,241			$	1,265,104
Real estate:
Commercial - Owner occupied	267				267				534				367,779				368,313
Commercial - Investor owned	—				—				—				413,170				413,170
Construction and land development	—				3,226				3,226				135,698				138,924
Residential	974				1,977				2,951				177,302				180,253
Consumer and other	18				—				18				69,777				69,795
Total	$	4,190			$	6,402			$	10,592			$	2,424,967			$	2,435,559
	December 31, 2014
(in thousands)	30-89 Days				90 or More				Total				Current				Total
	Past Due				Days				Past Due
					Past Due
Commercial and industrial	$	3,059			$	232			$	3,291			$	1,266,968			$	1,270,259
Real estate:
Commercial - Owner occupied	766				496				1,262				356,241				357,503
Commercial - Investor owned	261				4,450				4,711				408,315				413,026
Construction and land development	702				2,524				3,226				141,547				144,773
Residential	168				—				168				185,084				185,252
Consumer and other	8				—				8				63,095				63,103
Total	$	4,964			$	7,702			$	12,666			$	2,421,250			$	2,433,916
The Company categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt, such as current financial information, historical payment experience, credit documentation, 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 March 31, 2015, which is based upon the most recent analysis performed, and December 31, 2014 is as follows:
	March 31, 2015
(in thousands)	Pass (1-6)				Watch (7)				Substandard (8)				Doubtful (9)				Total
Commercial and industrial	$	1,149,860			$	84,786			$	29,799			$	659			$	1,265,104
Real estate:
Commercial - Owner occupied	346,073				17,730				4,510				—				368,313
Commercial - Investor owned	378,017				23,581				11,572				—				413,170
Construction and land development	117,768				13,178				7,276				702				138,924
Residential	162,387				11,681				6,185				—				180,253
Consumer and other	69,473				48				274				—				69,795
Total	$	2,223,578			$	151,004			$	59,616			$	1,361			$	2,435,559
	December 31, 2014
(in thousands)	Pass (1-6)				Watch (7)				Substandard (8)				Doubtful (9)				Total
Commercial and industrial	$	1,167,751			$	62,315			$	40,193			$	—			$	1,270,259
Real estate:
Commercial - Owner occupied	334,347				18,025				5,131				—				357,503
Commercial - Investor owned	372,818				24,088				16,120				—				413,026
Construction and land development	123,260				12,993				8,520				—				144,773
Residential	168,543				11,012				5,697				—				185,252
Consumer and other	62,711				51				341				—				63,103
Total	$	2,229,430			$	128,484			$	76,002			$	—			$	2,433,916

Purchase_Credit_Impaired_PCI_L

Purchase Credit Impaired ("PCI") Loans	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Purchase Credit Impaired (PCI) Loans	PURCHASE CREDIT IMPAIRED ("PCI") LOANS
	Below is a summary of PCI loans by category at March 31, 2015 and December 31, 2014:
		March 31, 2015				December 31, 2014
	(in thousands)	Weighted-	Recorded			Weighted-	Recorded
		Average	Investment			Average	Investment
		Risk Rating	PCI Loans			Risk Rating	PCI Loans
	Real estate loans:
	Construction and land development	6.26	$	7,574		6.16	$	7,740
	Commercial - Investor Owned	7.12	37,524			7.07	39,066
	Commercial - Owner Occupied	6.39	20,935			6.35	22,695
	Residential real estate	5.52	24,314			5.54	25,121
	Total real estate loans		90,347				94,622
	Commercial and industrial	6.67	4,125			6.57	4,012
	Consumer and other	5.29	316			5.39	469
	Purchase credit impaired loans		$	94,788			$	99,103
	The aging of the recorded investment in past due PCI loans by portfolio class and category at March 31, 2015 and December 31, 2014 is shown below:
		March 31, 2015
	(in thousands)	30-89 Days			90 or More				Total			Current			Total
		Past Due			Days				Past Due
					Past Due
	Commercial and industrial	$	—		$	6			$	6		$	4,119		$	4,125
	Real estate:
	Commercial - Owner occupied	—			3,115				3,115			17,820			20,935
	Commercial - Investor owned	—			7,953				7,953			29,571			37,524
	Construction and land development	396			—				396			7,178			7,574
	Residential	448			2,847				3,295			21,019			24,314
	Consumer and other	10			—				10			306			316
	Total	$	854		$	13,921			$	14,775		$	80,013		$	94,788
		December 31, 2014
	(in thousands)	30-89 Days			90 or More				Total			Current			Total
		Past Due			Days				Past Due
					Past Due
	Commercial and industrial	$	—		$	16			$	16		$	3,996		$	4,012
	Real estate:
	Commercial - Owner occupied	—			2,759				2,759			19,936			22,695
	Commercial - Investor owned	878			6,484				7,362			31,704			39,066
	Construction and land development	774			—				774			6,966			7,740
	Residential	2,020			1,451				3,471			21,650			25,121
	Consumer and other	—			12				12			457			469
	Total	$	3,672		$	10,722			$	14,394		$	84,709		$	99,103
	The following table is a rollforward of PCI loans, net of the allowance for loan losses, for the three months ended March 31, 2015 and 2014.
	(in thousands)	Contractual Cashflows			Non-accretable Difference				Accretable Yield			Carrying Amount
	Balance January 1, 2015	$	178,145		$	65,719			$	28,733		$	83,693
	Principal reductions and interest payments	(6,148		)	—				—			(6,148		)
	Accretion of loan discount	—			—				(3,088		)	3,088
	Changes in contractual and expected cash flows due to remeasurement	(12,159		)	(26,187		)		8,517			5,511
	Reductions due to disposals	(5,623		)	(1,709		)		(933		)	(2,981		)
	Balance March 31, 2015	$	154,215		$	37,823			$	33,229		$	83,163
	Balance January 1, 2014	$	266,068		$	87,438			$	53,530		$	125,100
	Principal reductions and interest payments	(9,849		)	—				—			(9,849		)
	Accretion of loan discount	—			—				(4,560		)	4,560
	Changes in contractual and expected cash flows due to remeasurement	4,888			10,503				(5,076		)	(539		)
	Reductions due to disposals	(14,297		)	(3,142		)		(2,042		)	(9,113		)
	Balance March 31, 2014	$	246,810		$	94,799			$	41,852		$	110,159
	The accretable yield is accreted into interest income over the estimated life of the acquired loans using the effective
	yield method.
	A summary of activity in the FDIC loss share receivable for the three months ended March 31, 2015 is as follows:
	(in thousands)	March 31,
		2015
	Balance at beginning of period	$	15,866
	Adjustments not reflected in income:
	Cash received from the FDIC for covered assets	(1,395		)
	FDIC reimbursable losses, net	(563		)
	Adjustments reflected in income:
Amortization, net	900
Loan impairment	(2,589		)
Reductions for payments on covered assets in excess of expected cash flows	(575		)
Balance at end of period	$	11,644
Outstanding customer balances on PCI loans were $127.7 million and $135.3 million as of March 31, 2015, and December 31, 2014, respectively.

Derivative_Financial_Instrumen

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	DERIVATIVE FINANCIAL INSTRUMENTS
	Client-Related Derivative Instruments. The Company enters into interest rate swaps to allow customers to hedge changes in fair value of certain loans. The table below summarizes the notional amounts and fair values of the client-related derivative instruments:
						Asset Derivatives				Liability Derivatives
						(Other Assets)				(Other Liabilities)
		Notional Amount				Fair Value				Fair Value
	(in thousands)	March 31,		December 31,		March 31,		December 31,		March 31,		December 31,
		2015		2014		2015		2014		2015		2014
	Non-designated hedging instruments
	Interest rate swap contracts	$	136,924	$	141,263	$	1,176	$	907	$	1,176	$	907
	Changes in the fair value of client-related derivative instruments are recognized currently in operations. For the three months ended March 31, 2015 and 2014, the gains and losses offset each other due to the Company's hedging of the client swaps.

Commitments

Commitments	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015, there were no unadvanced commitments on impaired loans.
	The contractual amounts of off-balance-sheet financial instruments as of March 31, 2015, and December 31, 2014, are as follows:
	(in thousands)	March 31,		December 31,
		2015		2014
	Commitments to extend credit	$	995,715	$	947,424
	Standby letters of credit	52,981		50,108
	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 March 31, 2015, and December 31, 2014, approximately $73.0 million and $65.9 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 approximately $0.2 million for estimated losses attributable to the unadvanced commitments at March 31, 2015 and December 31, 2014.
	Standby letters of credit are conditional commitments issued by the Company to guarantee the performance 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 2.9 years at March 31, 2015.
	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 cashflows of the Company or any of its subsidiaries.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value:
		March 31, 2015
	(in thousands)	Quoted Prices in			Significant			Significant		Total Fair
		Active Markets			Other			Unobservable		Value
		for Identical Assets			Observable Inputs			Inputs
		(Level 1)			(Level 2)			(Level 3)
	Assets
	Securities available for sale
	Obligations of U.S. Government-sponsored enterprises	$	—		$	100,899		$	—	$	100,899
	Obligations of states and political subdivisions	—			31,976			3,071		35,047
	Residential mortgage-backed securities	—			274,115			—		274,115
	Total securities available for sale	$	—		$	406,990		$	3,071	$	410,061
	State tax credits held for sale	—			—			10,286		10,286
	Derivative financial instruments	—			1,176			—		1,176
	Total assets	$	—		$	408,166		$	13,357	$	421,523
	Liabilities
	Derivative financial instruments	$	—		$	1,176		$	—	$	1,176
	Total liabilities	$	—		$	1,176		$	—	$	1,176
		December 31, 2014
	(in thousands)	Quoted Prices in			Significant			Significant		Total Fair
		Active Markets			Other			Unobservable		Value
		for Identical Assets			Observable Inputs			Inputs
		(Level 1)			(Level 2)			(Level 3)
	Assets
	Securities available for sale
	Obligations of U.S. Government-sponsored enterprises	$	—		$	91,826		$	—	$	91,826
	Obligations of states and political subdivisions	—			31,822			3,059		34,881
	Residential mortgage-backed securities	—			273,439			—		273,439
	Total securities available for sale	$	—		$	397,087		$	3,059	$	400,146
	State tax credits held for sale	—			—			11,689		11,689
	Derivative financial instruments	—			909			—		909
	Total assets	$	—		$	397,996		$	14,748	$	412,744
	Liabilities
	Derivative financial instruments	$	—		$	907		$	—	$	907
	Total liabilities	$	—		$	907		$	—	$	907
	•	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 March 31, 2015, 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.
	•	Portfolio Loans. Certain fixed rate portfolio loans are accounted for as trading instruments and reported at fair value. Fair value on these loans is determined using a third party valuation model with observable Level 2 market data inputs.
	•	State tax credits held for sale. At March 31, 2015, of the $42.4 million of state tax credits held for sale on the condensed consolidated balance sheet, approximately $10.3 million were carried at fair value. The remaining $32.1 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 March 31, 2015 and 2014.
	•	Purchases, sales, issuances and settlements. There were no Level 3 purchases during the quarter ended March 31, 2015 or 2014.
	•	Transfers in and/or out of Level 3. There were no transfers in an/or out of Level 3 for the quarter ended March 31, 2015 and 2014.
		Securities available for sale, at fair value
		Three months ended March 31,
	(in thousands)	2015			2014
	Beginning balance	$	3,059		$	3,040
	Total gains:
	Included in other comprehensive income	12			6
	Purchases, sales, issuances and settlements:
	Purchases	—			—
	Transfer in and/or out of Level 3	—			—
	Ending balance	$	3,071		$	3,046
	Change in unrealized gains relating to	$	12		$	6
	assets still held at the reporting date
		State tax credits held for sale
		Three months ended March 31,
	(in thousands)	2015			2014
	Beginning balance	$	11,689		$	16,491
	Total gains:
Included in earnings	128			118
Purchases, sales, issuances and settlements:
Sales	(1,531		)	(1,709		)
Ending balance	$	10,286		$	14,900
Change in unrealized gains relating to	$	(274	)	$	(334	)
assets still held at the reporting date
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 March 31, 2015.
	-1			-1			-1		-1
(in thousands)	Total Fair Value			Quoted Prices in Active			Significant		Significant		Total losses for the three
				Markets for			Other		Unobservable		months ended
				Identical			Observable		Inputs		31-Mar-15
				Assets			Inputs		(Level 3)
				(Level 1)			(Level 2)
Impaired loans	$	8,419		$	—		$	—	$	8,419	$	(2,568	)
Other real estate	463			—			—		463		(41		)
Total	$	8,882		$	—		$	—	$	8,882	$	(2,609	)
(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. 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 March 31, 2015 and December 31, 2014.
	March 31, 2015						December 31, 2014
(in thousands)	Carrying Amount			Estimated fair value			Carrying Amount		Estimated fair value
Balance sheet assets
Cash and due from banks	$	56,420		$	56,420		$	42,903	$	42,903
Federal funds sold	48			48			35		35
Interest-bearing deposits	43,865			43,865			63,058		63,058
Securities available for sale	410,061			410,061			400,146		400,146
Securities held to maturity	45,563			45,811			45,985		45,795
Other investments, at cost	11,719			11,719			17,037		17,037
Loans held for sale	7,843			7,843			4,033		4,033
Derivative financial instruments	1,176			1,176			909		909
Portfolio loans, net	2,488,434			2,483,751			2,487,424		2,482,700
State tax credits, held for sale	42,411			46,851			38,309		42,970
Accrued interest receivable	8,061			8,061			7,956		7,956
Balance sheet liabilities
Deposits	2,674,631			2,677,798			2,491,510		2,494,624
Subordinated debentures	56,807			34,557			56,807		34,124
Federal Home Loan Bank advances	6,000			6,000			144,000		144,000
Other borrowings	186,864			186,937			239,883		239,950
Derivative financial instruments	1,176			1,176			907		907
Accrued interest payable	845			845			843		843
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 20-Fair Value Measurements in the Company's Annual Report on Form 10-K for the year ended December 31, 2014.
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 March 31, 2015, and December 31, 2014.
	Estimated Fair Value Measurement at Reporting Date Using								Balance at
(in thousands)	Level 1			Level 2			Level 3		31-Mar-15
Financial Assets:
Securities held to maturity	$	—		$	45,811		$	—	$	45,811
Portfolio loans, net	—			—			2,483,751		2,483,751
State tax credits, held for sale	—			—			36,565		36,565
Financial Liabilities:
Deposits	2,109,133			—			568,665		2,677,798
Subordinated debentures	—			34,557			—		34,557
Federal Home Loan Bank advances	—			6,000			—		6,000
Other borrowings	—			186,937			—		186,937
	Estimated Fair Value Measurement at Reporting Date Using								Balance at
(in thousands)	Level 1			Level 2			Level 3		31-Dec-14
Financial Assets:
Securities held to maturity	$	—		$	45,795		$	—	$	45,795
Portfolio loans, net	—			—			2,482,700		2,482,700
State tax credits, held for sale	—			—			31,281		31,281
Financial Liabilities:
Deposits	1,986,158			—			508,466		2,494,624
Subordinated debentures	—			34,124			—		34,124
Federal Home Loan Bank advances	—			144,000			—		144,000
Other borrowings	—			239,950			—		239,950

New_Authoritative_Accounting_G

New Authoritative Accounting Guidance	3 Months Ended
	Mar. 31, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Authoritative Accounting Guidance	NEW AUTHORITATIVE ACCOUNTING GUIDANCE
	FASB ASU 2014-09, "Revenue from Contracts with Customers" In May 2014, the FASB issued ASU No. 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 is effective for annual reporting periods (including interim periods within those periods) beginning after December 15, 2016 for public companies. Early adoption is not permitted. Entities have the option of using either a full retrospective or modified approach to adopt ASU 2014-09. 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.
	FASB ASU 2014-11, "Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures" In June 2014, the FASB issued ASU No. 2014-11, "Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures." The objective of ASU 2014-11 is to amend the accounting for certain secured financing transactions, and requires enhanced disclosures with respect to transactions recognized as sales in which exposure to the derecognized asset is retained through a separate agreement with the counterparty. In addition, the guidance requires enhanced disclosures with respect to the types and quality of financial assets pledged in secured financing transactions. The guidance became effective in the first quarter of 2015, except for the disclosures regarding the types and quality of financial assets pledged, which will become effective in the second quarter of 2015. The adoption of the guidance did not have a material impact on the Company's consolidated balance sheets or statements of operations.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Business and Consolidation
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 that the Company would be required to sell the security before its anticipated recovery in market value. At March 31, 2015, 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 2014-09, "Revenue from Contracts with Customers" In May 2014, the FASB issued ASU No. 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 is effective for annual reporting periods (including interim periods within those periods) beginning after December 15, 2016 for public companies. Early adoption is not permitted. Entities have the option of using either a full retrospective or modified approach to adopt ASU 2014-09. 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.
	FASB ASU 2014-11, "Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures" In June 2014, the FASB issued ASU No. 2014-11, "Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures." The objective of ASU 2014-11 is to amend the accounting for certain secured financing transactions, and requires enhanced disclosures with respect to transactions recognized as sales in which exposure to the derecognized asset is retained through a separate agreement with the counterparty. In addition, the guidance requires enhanced disclosures with respect to the types and quality of financial assets pledged in secured financing transactions. The guidance became effective in the first quarter of 2015, except for the disclosures regarding the types and quality of financial assets pledged, which will become effective in the second quarter of 2015. The adoption of the guidance did not have a material impact on the Company's consolidated balance sheets or statements of operations.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
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 March 31,
	(in thousands, except per share data)	2015		2014
	Net income as reported	$	9,346	$	5,848
	Impact of assumed conversions
	Interest on 9% convertible trust preferred securities, net of income tax	—		66
	Net income available to common shareholders and assumed conversions	$	9,346	$	5,914
	Weighted average common shares outstanding	19,934		19,521
	Incremental shares from assumed conversions of convertible trust preferred securities	—		230
	Additional dilutive common stock equivalents	223		198
	Weighted average diluted common shares outstanding	$	20,157	$	19,949
	Basic earnings per common share:	$	0.47	$	0.3
	Diluted earnings per common share:	$	0.46	$	0.3

Investments_Tables

Investments (Tables)	3 Months Ended
	Mar. 31, 2015
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:
		March 31, 2015
	(in thousands)	Amortized Cost			Gross		Gross			Fair Value
					Unrealized Gains		Unrealized Losses
	Available for sale securities:
	Obligations of U.S. Government-sponsored enterprises	$	99,643		$	1,256	$	—		$	100,899
	Obligations of states and political subdivisions	33,965			1,441		(359		)	35,047
	Agency mortgage-backed securities	270,455			4,470		(810		)	274,115
	Total securities available for sale	$	404,063		$	7,167	$	(1,169	)	$	410,061
	Held to maturity securities:
	Obligations of states and political subdivisions	$	14,883		$	2	$	(109	)	$	14,776
	Agency mortgage-backed securities	30,680			355		—			31,035
	Total securities held to maturity	$	45,563		$	357	$	(109	)	$	45,811
		December 31, 2014
	(in thousands)	Amortized Cost			Gross		Gross			Fair Value
					Unrealized Gains		Unrealized Losses
	Available for sale securities:
	Obligations of U.S. Government-sponsored enterprises	$	91,355		$	624	$	(153	)	$	91,826
	Obligations of states and political subdivisions	33,997			1,300		(416		)	34,881
	Agency mortgage-backed securities	271,430			3,577		(1,568		)	273,439
	Total securities available for sale	$	396,782		$	5,501	$	(2,137	)	$	400,146
	Held to maturity securities:
	Obligations of states and political subdivisions	$	14,900		$	—	$	(325	)	$	14,575
	Agency mortgage-backed securities	31,085			150		(15		)	31,220
	Total securities held to maturity	$	45,985		$	150	$	(340	)	$	45,795
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:
		March 31, 2015
	(in thousands)	Amortized Cost			Gross		Gross			Fair Value
					Unrealized Gains		Unrealized Losses
	Available for sale securities:
	Obligations of U.S. Government-sponsored enterprises	$	99,643		$	1,256	$	—		$	100,899
	Obligations of states and political subdivisions	33,965			1,441		(359		)	35,047
	Agency mortgage-backed securities	270,455			4,470		(810		)	274,115
	Total securities available for sale	$	404,063		$	7,167	$	(1,169	)	$	410,061
	Held to maturity securities:
	Obligations of states and political subdivisions	$	14,883		$	2	$	(109	)	$	14,776
	Agency mortgage-backed securities	30,680			355		—			31,035
	Total securities held to maturity	$	45,563		$	357	$	(109	)	$	45,811
		December 31, 2014
	(in thousands)	Amortized Cost			Gross		Gross			Fair Value
					Unrealized Gains		Unrealized Losses
	Available for sale securities:
	Obligations of U.S. Government-sponsored enterprises	$	91,355		$	624	$	(153	)	$	91,826
	Obligations of states and political subdivisions	33,997			1,300		(416		)	34,881
	Agency mortgage-backed securities	271,430			3,577		(1,568		)	273,439
	Total securities available for sale	$	396,782		$	5,501	$	(2,137	)	$	400,146
	Held to maturity securities:
	Obligations of states and political subdivisions	$	14,900		$	—	$	(325	)	$	14,575
	Agency mortgage-backed securities	31,085			150		(15		)	31,220
	Total securities held to maturity	$	45,985		$	150	$	(340	)	$	45,795
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of debt securities at March 31, 2015, 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	$	4,331		$	4,382	$	—		$	—
	Due after one year through five years	100,610			102,383		662			664
	Due after five years through ten years	25,767			26,561		12,963			12,875
	Due after ten years	2,900			2,620		1,258			1,237
	Mortgage-backed securities	270,455			274,115		30,680			31,035
		$	404,063		$	410,061	$	45,563		$	45,811
Schedule of Unrealized Loss on Investments	The following table represents a summary of investment securities that had an unrealized loss:
		March 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 U.S. Government-sponsored enterprises	$	—		$	—	$	—		$	—	$	—	$	—
	Obligations of states and political subdivisions	14,982			127		4,321			341		19,303		468
	Agency mortgage-backed securities	28,750			179		21,868			631		50,618		810
		$	43,732		$	306	$	26,189		$	972	$	69,921	$	1,278
		December 31, 2014
		Less than 12 months					12 months or more					Total
	(in thousands)	Fair Value			Unrealized Losses		Fair Value			Unrealized Losses		Fair Value		Unrealized Losses
	Obligations of U.S. Government-sponsored enterprises	$	5,399		$	10	$	24,852		$	143	$	30,251	$	153
	Obligations of states and political subdivisions	16,827			343		5,349			398		22,176		741
	Agency mortgage-backed securities	26,367			56		97,054			1,527		123,421		1,583
		$	48,593		$	409	$	127,255		$	2,068	$	175,848	$	2,477
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 March 31,
	(in thousands)	2015			2014
	Gross gains realized	$	63		$	—
	Gross losses realized	(40		)	—
	Proceeds from sales	41,069			—

Portfolio_Loans_Tables

Portfolio Loans (Tables) (Non-Covered Loans)	3 Months Ended
	Mar. 31, 2015
Non-Covered Loans
Non-covered Loans [Line Items]
Summary of Portfolio Loans by Category	Below is a summary of Portfolio loans by category at March 31, 2015 and December 31, 2014:
	(in thousands)	March 31, 2015				December 31, 2014
	Real estate loans:
	Construction and land development	$	138,924			$	144,773
	Commercial - Investor Owned	413,170				413,026
	Commercial - Owner Occupied	368,313				357,503
	Residential real estate	180,253				185,252
	Total real estate loans	1,100,660				1,100,554
	Commercial and industrial	1,265,104				1,270,259
	Consumer and other	68,830				62,208
	Portfolio loans	2,434,594				2,433,021
	Unearned loan costs, net	965				895
	Portfolio loans, including unearned loan costs	$	2,435,559			$	2,433,916
Summary of Allowance for Loan Losses and the Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method
	(in thousands)	Commercial & Industrial				Commercial				Commercial				Construction and Land Development				Residential Real Estate				Consumer & Other			Total
						Real Estate				Real Estate
						Owner Occupied				Investor Owned
	Allowance for Loan Losses:
	Balance at	$	17,004			$	3,625			$	4,598			$	1,720			$	2,830			$	408		$	30,185
	31-Dec-14
	Provision charged to expense	823				(175		)		(12		)		914				74				(44		)	1,580
	Losses charged off	(1,484		)		—				—				—				(1,073		)		(11		)	(2,568		)
	Recoveries	769				127				29				60				26				80			1,091
	Balance at	$	17,112			$	3,577			$	4,615			$	2,694			$	1,857			$	433		$	30,288
	31-Mar-15
	(in thousands)	Commercial & Industrial				Commercial				Commercial				Construction and Land Development				Residential Real Estate				Consumer & Other			Total
						Real Estate				Real Estate
						Owner Occupied				Investor Owned
	Balance March 31, 2015
	Allowance for Loan Losses - Ending Balance:
	Individually evaluated for impairment	$	1,196			$	297			$	—			$	1,370			$	—			$	—		$	2,863
	Collectively evaluated for impairment	15,916				3,280				4,615				1,324				1,857				433			27,425
	Total	$	17,112			$	3,577			$	4,615			$	2,694			$	1,857			$	433		$	30,288
	Loans - Ending Balance:
	Individually evaluated for impairment	$	4,250			$	3,380			$	581			$	6,366			$	2,655			$	—		$	17,232
	Collectively evaluated for impairment	1,260,854				364,933				412,589				132,558				177,598				69,795			2,418,327
	Total	$	1,265,104			$	368,313			$	413,170			$	138,924			$	180,253			$	69,795		$	2,435,559
	Balance December 31, 2014
	Allowance for Loan Losses - Ending Balance:
	Individually evaluated for impairment	$	704			$	286			$	—			$	352			$	1,052			$	—		$	2,394
	Collectively evaluated for impairment	16,300				3,339				4,598				1,368				1,778				408			27,791
	Total	$	17,004			$	3,625			$	4,598			$	1,720			$	2,830			$	408		$	30,185
	Loans - Ending Balance:
	Individually evaluated for impairment	$	5,998			$	3,384			$	5,036			$	6,866			$	3,082			$	—		$	24,366
	Collectively evaluated for impairment	1,264,261				354,119				407,990				137,907				182,170				63,103			2,409,550
	Total	$	1,270,259			$	357,503			$	413,026			$	144,773			$	185,252			$	63,103		$	2,433,916
Summary of Portfolio Loans Individually Evaluated for Impairment and Recorded Investment in Impaired Non-Covered Loans by Category	at March 31, 2015 and December 31, 2014, is as follows:
		March 31, 2015
	(in thousands)	Unpaid				Recorded				Recorded				Total				Related Allowance				Average
		Contractual				Investment				Investment				Recorded Investment								Recorded Investment
		Principal Balance				With No Allowance				With
										Allowance
	Commercial and industrial	$	5,141			$	3,223			$	1,068			$	4,291			$	1,196			$	8,956
	Real estate:
	Commercial - Owner occupied	1,383				759				560				1,319				297				649
	Commercial - Investor owned	581				—				581				581				—				632
	Construction and land development	7,271				3,881				2,973				6,854				1,370				6,682
	Residential	3,707				—				2,696				2,696				—				2,940
	Consumer and other	—				—				—				—				—				759
	Total	$	18,083			$	7,863			$	7,878			$	15,741			$	2,863			$	20,618
		December 31, 2014
	(in thousands)	Unpaid				Recorded				Recorded				Total				Related Allowance				Average
		Contractual				Investment				Investment				Recorded Investment								Recorded Investment
		Principal Balance				With No Allowance				With
										Allowance
	Commercial and industrial	$	8,042			$	2,609			$	3,464			$	6,073			$	704			$	4,136
	Real estate:
	Commercial - Owner occupied	1,376				770				519				1,289				286				1,281
	Commercial - Investor owned	5,036				—				5,187				5,187				—				4,375
	Construction and land development	7,961				419				6,929				7,348				352				7,280
	Residential	3,082				2,943				150				3,093				1,052				954
	Consumer and other	—				—				—				—				—				581
	Total	$	25,497			$	6,741			$	16,249			$	22,990			$	2,394			$	18,607
	The following table presents details for past due and impaired loans:
		For the three months ended
	(in thousands)	31-Mar-15				31-Mar-14
	Total interest income that would have been recognized under original terms	$	315			$	320
	Total cash received and recognized as interest income on non-accrual loans	27				9
	Total interest income recognized on impaired loans	13				6
	The recorded investment in impaired Portfolio loans by category at March 31, 2015 and December 31, 2014, is as follows:
		March 31, 2015
	(in thousands)	Non-accrual				Restructured				Loans over 90 days past due and still accruing interest				Total
	Commercial and industrial	$	4,291			$	—			$	—			$	4,291
	Real estate:
	Commercial - Investor owned	—				581				—				581
	Commercial - Owner occupied	560				759				—				1,319
	Construction and land development	6,854				—				—				6,854
	Residential	2,696				—				—				2,696
	Consumer and other	—				—				—				—
	Total	$	14,401			$	1,340			$	—			$	15,741
		December 31, 2014
	(in thousands)	Non-accrual				Restructured				Loans over 90 days past due and still accruing interest				Total
	Commercial and industrial	$	6,073			$	—			$	—			$	6,073
	Real estate:
	Commercial - Investor owned	4,597				590				—				5,187
	Commercial - Owner occupied	519				770				—				1,289
	Construction and land development	7,348				—				—				7,348
	Residential	3,093				—				—				3,093
	Consumer and other	—				—				—				—
	Total	$	21,630			$	1,360			$	—			$	22,990
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 months ended March 31, 2015 and 2014, is as follows:
		Three months ended March 31, 2015											Three months ended March 31, 2014
	(in thousands, except for number of loans)	Number of Loans			Pre-Modification Outstanding				Post-Modification Outstanding				Number of Loans			Pre-Modification Outstanding				Post-Modification Outstanding
					Recorded Balance				Recorded Balance							Recorded Balance				Recorded Balance
	Commercial and industrial	—			$	—			$	—			—			$	—			$	—
	Real estate:
	Commercial - Owner occupied	—			—				—				2			1,292				1,042
	Commercial - Investor owned	—			—				—				—			—				—
	Construction and land development	—			—				—				—			—				—
	Residential	—			—				—				—			—				—
	Consumer and other	—			—				—				—			—				—
	Total	—			$	—			$	—			2			$	1,292			$	1,042
Summary of Recorded Investment by Category for Portfolio Loans Restructured and Subsequently Defaulted	Portfolio loans that were restructured and subsequently defaulted during the three months ended March 31, 2015 or 2014.
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 March 31, 2015 and December 31, 2014 is shown below.
		March 31, 2015
	(in thousands)	30-89 Days				90 or More				Total				Current				Total
		Past Due				Days				Past Due
						Past Due
	Commercial and industrial	$	2,931			$	932			$	3,863			$	1,261,241			$	1,265,104
	Real estate:
	Commercial - Owner occupied	267				267				534				367,779				368,313
	Commercial - Investor owned	—				—				—				413,170				413,170
	Construction and land development	—				3,226				3,226				135,698				138,924
	Residential	974				1,977				2,951				177,302				180,253
	Consumer and other	18				—				18				69,777				69,795
	Total	$	4,190			$	6,402			$	10,592			$	2,424,967			$	2,435,559
		December 31, 2014
	(in thousands)	30-89 Days				90 or More				Total				Current				Total
		Past Due				Days				Past Due
						Past Due
	Commercial and industrial	$	3,059			$	232			$	3,291			$	1,266,968			$	1,270,259
	Real estate:
	Commercial - Owner occupied	766				496				1,262				356,241				357,503
	Commercial - Investor owned	261				4,450				4,711				408,315				413,026
	Construction and land development	702				2,524				3,226				141,547				144,773
	Residential	168				—				168				185,084				185,252
	Consumer and other	8				—				8				63,095				63,103
	Total	$	4,964			$	7,702			$	12,666			$	2,421,250			$	2,433,916
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 March 31, 2015, which is based upon the most recent analysis performed, and December 31, 2014 is as follows:
		March 31, 2015
	(in thousands)	Pass (1-6)				Watch (7)				Substandard (8)				Doubtful (9)				Total
	Commercial and industrial	$	1,149,860			$	84,786			$	29,799			$	659			$	1,265,104
	Real estate:
	Commercial - Owner occupied	346,073				17,730				4,510				—				368,313
	Commercial - Investor owned	378,017				23,581				11,572				—				413,170
	Construction and land development	117,768				13,178				7,276				702				138,924
	Residential	162,387				11,681				6,185				—				180,253
	Consumer and other	69,473				48				274				—				69,795
	Total	$	2,223,578			$	151,004			$	59,616			$	1,361			$	2,435,559
		December 31, 2014
	(in thousands)	Pass (1-6)				Watch (7)				Substandard (8)				Doubtful (9)				Total
	Commercial and industrial	$	1,167,751			$	62,315			$	40,193			$	—			$	1,270,259
	Real estate:
	Commercial - Owner occupied	334,347				18,025				5,131				—				357,503
	Commercial - Investor owned	372,818				24,088				16,120				—				413,026
	Construction and land development	123,260				12,993				8,520				—				144,773
	Residential	168,543				11,012				5,697				—				185,252
	Consumer and other	62,711				51				341				—				63,103
	Total	$	2,229,430			$	128,484			$	76,002			$	—			$	2,433,916

Purchase_Credit_Impaired_PCI_L1

Purchase Credit Impaired ("PCI") Loans (Tables)	3 Months Ended
	Mar. 31, 2015
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 three months ended March 31, 2015 and 2014.
	(in thousands)	Contractual Cashflows			Non-accretable Difference				Accretable Yield			Carrying Amount
	Balance January 1, 2015	$	178,145		$	65,719			$	28,733		$	83,693
	Principal reductions and interest payments	(6,148		)	—				—			(6,148		)
	Accretion of loan discount	—			—				(3,088		)	3,088
	Changes in contractual and expected cash flows due to remeasurement	(12,159		)	(26,187		)		8,517			5,511
	Reductions due to disposals	(5,623		)	(1,709		)		(933		)	(2,981		)
	Balance March 31, 2015	$	154,215		$	37,823			$	33,229		$	83,163
	Balance January 1, 2014	$	266,068		$	87,438			$	53,530		$	125,100
	Principal reductions and interest payments	(9,849		)	—				—			(9,849		)
	Accretion of loan discount	—			—				(4,560		)	4,560
	Changes in contractual and expected cash flows due to remeasurement	4,888			10,503				(5,076		)	(539		)
	Reductions due to disposals	(14,297		)	(3,142		)		(2,042		)	(9,113		)
	Balance March 31, 2014	$	246,810		$	94,799			$	41,852		$	110,159
Covered Loans
Covered Loans [Line Items]
Summary of PCI Loans by Category	Below is a summary of PCI loans by category at March 31, 2015 and December 31, 2014:
		March 31, 2015				December 31, 2014
	(in thousands)	Weighted-	Recorded			Weighted-	Recorded
		Average	Investment			Average	Investment
		Risk Rating	PCI Loans			Risk Rating	PCI Loans
	Real estate loans:
	Construction and land development	6.26	$	7,574		6.16	$	7,740
	Commercial - Investor Owned	7.12	37,524			7.07	39,066
	Commercial - Owner Occupied	6.39	20,935			6.35	22,695
	Residential real estate	5.52	24,314			5.54	25,121
	Total real estate loans		90,347				94,622
	Commercial and industrial	6.67	4,125			6.57	4,012
	Consumer and other	5.29	316			5.39	469
	Purchase credit impaired loans		$	94,788			$	99,103
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 March 31, 2015 and December 31, 2014 is shown below:
		March 31, 2015
	(in thousands)	30-89 Days			90 or More				Total			Current			Total
		Past Due			Days				Past Due
					Past Due
	Commercial and industrial	$	—		$	6			$	6		$	4,119		$	4,125
	Real estate:
	Commercial - Owner occupied	—			3,115				3,115			17,820			20,935
	Commercial - Investor owned	—			7,953				7,953			29,571			37,524
	Construction and land development	396			—				396			7,178			7,574
	Residential	448			2,847				3,295			21,019			24,314
	Consumer and other	10			—				10			306			316
	Total	$	854		$	13,921			$	14,775		$	80,013		$	94,788
		December 31, 2014
	(in thousands)	30-89 Days			90 or More				Total			Current			Total
		Past Due			Days				Past Due
					Past Due
	Commercial and industrial	$	—		$	16			$	16		$	3,996		$	4,012
	Real estate:
	Commercial - Owner occupied	—			2,759				2,759			19,936			22,695
	Commercial - Investor owned	878			6,484				7,362			31,704			39,066
	Construction and land development	774			—				774			6,966			7,740
	Residential	2,020			1,451				3,471			21,650			25,121
	Consumer and other	—			12				12			457			469
	Total	$	3,672		$	10,722			$	14,394		$	84,709		$	99,103
Summary of FDIC Loss Share Receivable	A summary of activity in the FDIC loss share receivable for the three months ended March 31, 2015 is as follows:
	(in thousands)	March 31,
		2015
	Balance at beginning of period	$	15,866
	Adjustments not reflected in income:
	Cash received from the FDIC for covered assets	(1,395		)
	FDIC reimbursable losses, net	(563		)
	Adjustments reflected in income:
	Amortization, net	900
	Loan impairment	(2,589		)
	Reductions for payments on covered assets in excess of expected cash flows	(575		)
	Balance at end of period	$	11,644

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2015

Risk Management

Derivative [Line Items]

Schedule of Notional Amounts and Fair Values of Derivative Instruments and Client-Related Derivative Instruments

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance

Client-Related

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

Liability Derivatives

(Other Assets)

(Other Liabilities)

Notional Amount

Fair Value

Fair Value

(in thousands)

March 31,

December 31,

March 31,

December 31,

March 31,

December 31,

2015

2014

2015

2014

2015

2014

Non-designated hedging instruments

Interest rate swap contracts

$

136,924

$

141,263

$

1,176

$

907

$

1,176

$

907

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance

or the three months ended March 31, 2015 and 2014, the gains and losses offset each other due to the Company's hedging of the client swaps.

Commitments_Tables

Commitments (Tables)	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Commitments	The contractual amounts of off-balance-sheet financial instruments as of March 31, 2015, and December 31, 2014, are as follows:
	(in thousands)	March 31,		December 31,
		2015		2014
	Commitments to extend credit	$	995,715	$	947,424
	Standby letters of credit	52,981		50,108

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value:
		March 31, 2015
	(in thousands)	Quoted Prices in			Significant			Significant		Total Fair
		Active Markets			Other			Unobservable		Value
		for Identical Assets			Observable Inputs			Inputs
		(Level 1)			(Level 2)			(Level 3)
	Assets
	Securities available for sale
	Obligations of U.S. Government-sponsored enterprises	$	—		$	100,899		$	—	$	100,899
	Obligations of states and political subdivisions	—			31,976			3,071		35,047
	Residential mortgage-backed securities	—			274,115			—		274,115
	Total securities available for sale	$	—		$	406,990		$	3,071	$	410,061
	State tax credits held for sale	—			—			10,286		10,286
	Derivative financial instruments	—			1,176			—		1,176
	Total assets	$	—		$	408,166		$	13,357	$	421,523
	Liabilities
	Derivative financial instruments	$	—		$	1,176		$	—	$	1,176
	Total liabilities	$	—		$	1,176		$	—	$	1,176
		December 31, 2014
	(in thousands)	Quoted Prices in			Significant			Significant		Total Fair
		Active Markets			Other			Unobservable		Value
		for Identical Assets			Observable Inputs			Inputs
		(Level 1)			(Level 2)			(Level 3)
	Assets
	Securities available for sale
	Obligations of U.S. Government-sponsored enterprises	$	—		$	91,826		$	—	$	91,826
	Obligations of states and political subdivisions	—			31,822			3,059		34,881
	Residential mortgage-backed securities	—			273,439			—		273,439
	Total securities available for sale	$	—		$	397,087		$	3,059	$	400,146
	State tax credits held for sale	—			—			11,689		11,689
	Derivative financial instruments	—			909			—		909
	Total assets	$	—		$	397,996		$	14,748	$	412,744
	Liabilities
	Derivative financial instruments	$	—		$	907		$	—	$	907
	Total liabilities	$	—		$	907		$	—	$	907
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 March 31, 2015 and 2014.
	•	Purchases, sales, issuances and settlements. There were no Level 3 purchases during the quarter ended March 31, 2015 or 2014.
	•	Transfers in and/or out of Level 3. There were no transfers in an/or out of Level 3 for the quarter ended March 31, 2015 and 2014.
		Securities available for sale, at fair value
		Three months ended March 31,
	(in thousands)	2015			2014
	Beginning balance	$	3,059		$	3,040
	Total gains:
	Included in other comprehensive income	12			6
	Purchases, sales, issuances and settlements:
	Purchases	—			—
	Transfer in and/or out of Level 3	—			—
	Ending balance	$	3,071		$	3,046
	Change in unrealized gains relating to	$	12		$	6
	assets still held at the reporting date
		State tax credits held for sale
		Three months ended March 31,
	(in thousands)	2015			2014
	Beginning balance	$	11,689		$	16,491
	Total gains:
	Included in earnings	128			118
	Purchases, sales, issuances and settlements:
	Sales	(1,531		)	(1,709		)
	Ending balance	$	10,286		$	14,900
	Change in unrealized gains relating to	$	(274	)	$	(334	)
	assets still held at the reporting date
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 March 31, 2015.
		-1			-1			-1		-1
	(in thousands)	Total Fair Value			Quoted Prices in Active			Significant		Significant		Total losses for the three
					Markets for			Other		Unobservable		months ended
					Identical			Observable		Inputs		31-Mar-15
					Assets			Inputs		(Level 3)
					(Level 1)			(Level 2)
	Impaired loans	$	8,419		$	—		$	—	$	8,419	$	(2,568	)
	Other real estate	463			—			—		463		(41		)
	Total	$	8,882		$	—		$	—	$	8,882	$	(2,609	)
	(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 March 31, 2015 and December 31, 2014.
		March 31, 2015						December 31, 2014
	(in thousands)	Carrying Amount			Estimated fair value			Carrying Amount		Estimated fair value
	Balance sheet assets
	Cash and due from banks	$	56,420		$	56,420		$	42,903	$	42,903
	Federal funds sold	48			48			35		35
	Interest-bearing deposits	43,865			43,865			63,058		63,058
	Securities available for sale	410,061			410,061			400,146		400,146
	Securities held to maturity	45,563			45,811			45,985		45,795
	Other investments, at cost	11,719			11,719			17,037		17,037
	Loans held for sale	7,843			7,843			4,033		4,033
	Derivative financial instruments	1,176			1,176			909		909
	Portfolio loans, net	2,488,434			2,483,751			2,487,424		2,482,700
	State tax credits, held for sale	42,411			46,851			38,309		42,970
	Accrued interest receivable	8,061			8,061			7,956		7,956
	Balance sheet liabilities
	Deposits	2,674,631			2,677,798			2,491,510		2,494,624
	Subordinated debentures	56,807			34,557			56,807		34,124
	Federal Home Loan Bank advances	6,000			6,000			144,000		144,000
	Other borrowings	186,864			186,937			239,883		239,950
	Derivative financial instruments	1,176			1,176			907		907
	Accrued interest payable	845			845			843		843
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 March 31, 2015, and December 31, 2014.
		Estimated Fair Value Measurement at Reporting Date Using								Balance at
	(in thousands)	Level 1			Level 2			Level 3		31-Mar-15
	Financial Assets:
	Securities held to maturity	$	—		$	45,811		$	—	$	45,811
	Portfolio loans, net	—			—			2,483,751		2,483,751
	State tax credits, held for sale	—			—			36,565		36,565
	Financial Liabilities:
	Deposits	2,109,133			—			568,665		2,677,798
	Subordinated debentures	—			34,557			—		34,557
	Federal Home Loan Bank advances	—			6,000			—		6,000
	Other borrowings	—			186,937			—		186,937
		Estimated Fair Value Measurement at Reporting Date Using								Balance at
	(in thousands)	Level 1			Level 2			Level 3		31-Dec-14
	Financial Assets:
	Securities held to maturity	$	—		$	45,795		$	—	$	45,795
	Portfolio loans, net	—			—			2,482,700		2,482,700
	State tax credits, held for sale	—			—			31,281		31,281
	Financial Liabilities:
	Deposits	1,986,158			—			508,466		2,494,624
	Subordinated debentures	—			34,124			—		34,124
	Federal Home Loan Bank advances	—			144,000			—		144,000
	Other borrowings	—			239,950			—		239,950

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net income as reported	$9,346	$5,848
Impact of assumed conversions
Interest on 9% convertible trust preferred securities, net of income tax	0	66
Net income available to common shareholders and assumed conversions	$9,346	$5,914
Weighted average common shares outstanding (in shares)	19,934,000	19,521,000
Incremental shares from assumed conversions of convertible trust preferred securities (in shares)	0	230,000
Additional dilutive common stock equivalents (in shares)	223,000	198,000
Weighted average diluted common shares outstanding (in shares)	20,157,000	19,949,000
Basic earnings per common share (in dollars per share)	$0.47	$0.30
Diluted earnings per common share (in dollars per share)	$0.46	$0.30
Common stock equivalents excluded from earnings per share calculations due to anti-dilutive effect (in shares)	277,581
Convertible Debt Securities
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Convertible trust preferred securities, interest rate, stated percentage	9.00%	9.00%

Preferred_Stock_and_Common_Sto

Preferred Stock and Common Stock Warrants (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Shares sold	0	0
Common stock, par value	$0.01	$0.01

Investments_Schedule_of_Availa

Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$45,563	$45,985
Gross Unrealized Gains	357	150
Gross Unrealized Losses	-109	-340
Fair Value	45,811	45,795
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	404,063	396,782
Gross Unrealized Gains	7,167	5,501
Gross Unrealized Losses	-1,169	-2,137
Fair Value	410,061	400,146
Obligations of U.S. Government-sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	99,643	91,355
Gross Unrealized Gains	1,256	624
Gross Unrealized Losses	0	-153
Fair Value	100,899	91,826
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	33,965	33,997
Gross Unrealized Gains	1,441	1,300
Gross Unrealized Losses	-359	-416
Fair Value	35,047	34,881
Agency mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	270,455	271,430
Gross Unrealized Gains	4,470	3,577
Gross Unrealized Losses	-810	-1,568
Fair Value	274,115	273,439
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	14,883	14,900
Gross Unrealized Gains	2	0
Gross Unrealized Losses	-109	-325
Fair Value	14,776	14,575
Agency mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	30,680	31,085
Gross Unrealized Gains	355	150
Gross Unrealized Losses	0	-15
Fair Value	$31,035	$31,220

Investments_Investments_Classi

Investments - Investments Classified by Contractual Maturity Date (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Available for sale, Amortized Cost
Due in one year or less	$4,331
Due after one year through five years	100,610
Due after five years through ten years	25,767
Due after ten years	2,900
Mortgage-backed securities	270,455
Amortized Cost	404,063	396,782
Available for sale, Estimated Fair Value
Due in one year or less	4,382
Due after one year through five years	102,383
Due after five years through ten years	26,561
Due after ten years	2,620
Mortgage-backed securities	274,115
Available for sale, fair value	410,061	400,146
Held to maturity, Amortized Cost
Due in one year or less	0
Due after one year through five years	662
Due after five years through ten years	12,963
Due after ten years	1,258
Mortgage-backed securities	30,680
Amortized Cost	45,563	45,985
Held to maturity, Estimated Fair Value
Due in one year or less	0
Due after one year through five years	664
Due after five years through ten years	12,875
Due after ten years	1,237
Mortgage-backed securities	31,035
Held to maturity, fair value	$45,811	$45,795

Investments_Schedule_of_Unreal

Investments - Schedule of Unrealized Loss on Investments (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$43,732	$48,593
Less than 12 months, unrealized losses	306	409
12 months or more, fair value	26,189	127,255
12 months or more, unrealized losses	972	2,068
Total, fair value	69,921	175,848
Total, unrealized losses	1,278	2,477
Obligations of U.S. Government-sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	0	5,399
Less than 12 months, unrealized losses	0	10
12 months or more, fair value	0	24,852
12 months or more, unrealized losses	0	143
Total, fair value	0	30,251
Total, unrealized losses	0	153
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	14,982	16,827
Less than 12 months, unrealized losses	127	343
12 months or more, fair value	4,321	5,349
12 months or more, unrealized losses	341	398
Total, fair value	19,303	22,176
Total, unrealized losses	468	741
Agency mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	28,750	26,367
Less than 12 months, unrealized losses	179	56
12 months or more, fair value	21,868	97,054
12 months or more, unrealized losses	631	1,527
Total, fair value	50,618	123,421
Total, unrealized losses	$810	$1,583

Investments_Schedule_of_Realiz

Investments - Schedule of Realized Gain (Loss) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Gross gains realized	$63	$0
Gross losses realized	-40	0
Proceeds from sales	$41,069	$0

Investments_Narrative_Details

Investments - Narrative (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Other investments, at cost	$11,719,000	$17,037,000
Maximum percentage of shareholders' equity security holdings held of one issuer	10.00%
Available-for-sale securities pledged as collateral, fair value	$251,400,000	$315,800,000
Mortgage-backed securities, weighted average life	4 years

Portfolio_Loans_Summary_of_Por

Portfolio Loans - Summary of Portfolio Loans by Category (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans, including unearned loan costs	$2,435,559	$2,433,916
Non-Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	2,434,594	2,433,021
Unearned loan costs, net	965	895
Portfolio loans, including unearned loan costs	2,435,559	2,433,916
Non-Covered Loans | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	138,924	144,773
Non-Covered Loans | Commercial - Investor Owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	413,170	413,026
Non-Covered Loans | Commercial - Owner Occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	368,313	357,503
Non-Covered Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	180,253	185,252
Non-Covered Loans | Total real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	1,100,660	1,100,554
Non-Covered Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	1,265,104	1,270,259
Non-Covered Loans | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Portfolio loans	68,830	62,208
Portfolio loans, including unearned loan costs	$69,795	$63,103

Portfolio_Loans_Summary_of_All

Portfolio Loans - Summary of Allowance for Loan Losses by Portfolio Class and Category (Details) (Non-Covered Loans, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2014	$30,185
Provision charged to expense	1,580
Losses charged off	-2,568
Recoveries	1,091
Balance at March 31, 2015	30,288
Commercial & Industrial
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2014	17,004
Provision charged to expense	823
Losses charged off	-1,484
Recoveries	769
Balance at March 31, 2015	17,112
Commercial Real Estate Owner Occupied
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2014	3,625
Provision charged to expense	-175
Losses charged off	0
Recoveries	127
Balance at March 31, 2015	3,577
Commercial Real Estate Investor Owned
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2014	4,598
Provision charged to expense	-12
Losses charged off	0
Recoveries	29
Balance at March 31, 2015	4,615
Construction and Land Development
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2014	1,720
Provision charged to expense	914
Losses charged off	0
Recoveries	60
Balance at March 31, 2015	2,694
Residential Real Estate
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2014	2,830
Provision charged to expense	74
Losses charged off	-1,073
Recoveries	26
Balance at March 31, 2015	1,857
Consumer & Other
Allowance for Loan Losses [Roll Forward]
Balance at December 31, 2014	408
Provision charged to expense	-44
Losses charged off	-11
Recoveries	80
Balance at March 31, 2015	$433

Portfolio_Loans_Summary_of_Rec

Portfolio Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Loans - Ending Balance:
Portfolio loans, including unearned loan costs	$2,435,559	$2,433,916
Non-Covered Loans
Balance March 31, 2015
Individually evaluated for impairment	2,863	2,394
Collectively evaluated for impairment	27,425	27,791
Total	30,288	30,185
Loans - Ending Balance:
Individually evaluated for impairment	17,232	24,366
Collectively evaluated for impairment	2,418,327	2,409,550
Total	2,434,594	2,433,021
Portfolio loans, including unearned loan costs	2,435,559	2,433,916
Non-Covered Loans | Commercial & Industrial
Balance March 31, 2015
Individually evaluated for impairment	1,196	704
Collectively evaluated for impairment	15,916	16,300
Total	17,112	17,004
Loans - Ending Balance:
Individually evaluated for impairment	4,250	5,998
Collectively evaluated for impairment	1,260,854	1,264,261
Total	1,265,104	1,270,259
Non-Covered Loans | Commercial Real Estate Investor Owned
Balance March 31, 2015
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	4,615	4,598
Total	4,615	4,598
Loans - Ending Balance:
Individually evaluated for impairment	581	5,036
Collectively evaluated for impairment	412,589	407,990
Total	413,170	413,026
Non-Covered Loans | Commercial Real Estate Owner Occupied
Balance March 31, 2015
Individually evaluated for impairment	297	286
Collectively evaluated for impairment	3,280	3,339
Total	3,577	3,625
Loans - Ending Balance:
Individually evaluated for impairment	3,380	3,384
Collectively evaluated for impairment	364,933	354,119
Total	368,313	357,503
Non-Covered Loans | Construction and Land Development
Balance March 31, 2015
Individually evaluated for impairment	1,370	352
Collectively evaluated for impairment	1,324	1,368
Total	2,694	1,720
Loans - Ending Balance:
Individually evaluated for impairment	6,366	6,866
Collectively evaluated for impairment	132,558	137,907
Total	138,924	144,773
Non-Covered Loans | Residential Real Estate
Balance March 31, 2015
Individually evaluated for impairment	0	1,052
Collectively evaluated for impairment	1,857	1,778
Total	1,857	2,830
Loans - Ending Balance:
Individually evaluated for impairment	2,655	3,082
Collectively evaluated for impairment	177,598	182,170
Total	180,253	185,252
Non-Covered Loans | Consumer & Other
Balance March 31, 2015
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	433	408
Total	433	408
Loans - Ending Balance:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	69,795	63,103
Total	68,830	62,208
Portfolio loans, including unearned loan costs	$69,795	$63,103

Portfolio_Loans_Summary_of_Por1

Portfolio Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) (Non-Covered Loans, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	$18,083		$25,497
Recorded Investment With No Allowance	7,863		6,741
Recorded Investment With Allowance	7,878		16,249
Total Recorded Investment	15,741		22,990	21,567
Related Allowance	2,863		2,394
Average Recorded Investment	20,618	18,607
Commercial & Industrial
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	5,141		8,042
Recorded Investment With No Allowance	3,223		2,609
Recorded Investment With Allowance	1,068		3,464
Total Recorded Investment	4,291		6,073
Related Allowance	1,196		704
Average Recorded Investment	8,956	4,136
Commercial - Owner Occupied
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	1,383		1,376
Recorded Investment With No Allowance	759		770
Recorded Investment With Allowance	560		519
Total Recorded Investment	1,319		1,289
Related Allowance	297		286
Average Recorded Investment	649	1,281
Commercial - Investor Owned
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	581		5,036
Recorded Investment With No Allowance	0		0
Recorded Investment With Allowance	581		5,187
Total Recorded Investment	581		5,187	7,190
Related Allowance	0		0
Average Recorded Investment	632	4,375
Construction and Land Development
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	7,271		7,961
Recorded Investment With No Allowance	3,881		419
Recorded Investment With Allowance	2,973		6,929
Total Recorded Investment	6,854		7,348
Related Allowance	1,370		352
Average Recorded Investment	6,682	7,280
Residential Real Estate
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	3,707		3,082
Recorded Investment With No Allowance	0		2,943
Recorded Investment With Allowance	2,696		150
Total Recorded Investment	2,696		3,093
Related Allowance	0		1,052
Average Recorded Investment	2,940	954
Consumer & Other
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Principal Balance	0		0
Recorded Investment With No Allowance	0		0
Recorded Investment With Allowance	0		0
Total Recorded Investment	0		0
Related Allowance	0		0
Average Recorded Investment	$759	$581

Portfolio_Loans_Summary_of_Pas

Portfolio Loans - Summary of Past Due and Impaired Loans (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Receivables [Abstract]
Total interest income that would have been recognized under original terms	$315	$320
Total cash received and recognized as interest income on non-accrual loans	27	9
Total interest income recognized on impaired loans	$13	$6

Portfolio_Loans_Narrative_Deta

Portfolio Loans - Narrative (Details) (USD $)	Mar. 31, 2015
In Millions, unless otherwise specified	loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans over 90 days past due and still accruing interest	0
Unadvanced commitments on impaired loans	$0
Specific reserves on restructured loans	0.3
Unadvanced Commitment on Impaired Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Estimated losses attributable to unadvanced commitments on impaired loans	$0.20

Portfolio_Loans_Summary_of_Rec1

Portfolio Loans - Summary of Recorded Investment in Impaired Portfolio Loans by Category (Details) (Non-Covered Loans, USD $)	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$14,401	$21,630
Restructured	1,340	1,360
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	15,741	22,990	21,567
Commercial & Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	4,291	6,073
Restructured	0	0
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	4,291	6,073
Commercial - Investor Owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	4,597
Restructured	581	590
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	581	5,187	7,190
Commercial - Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	560	519
Restructured	759	770
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	1,319	1,289
Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	6,854	7,348
Restructured	0	0
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	6,854	7,348
Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,696	3,093
Restructured	0	0
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	2,696	3,093
Consumer & Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Restructured	0	0
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	$0	$0

Portfolio_Loans_Summary_of_Rec2

Portfolio Loans - Summary of Recorded Investment by Category for Portfolio Loans Restructured (Details) (Non-Covered Loans, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
	loan	loan
Financing Receivable, Modifications [Line Items]
Number of Loans	0	2
Pre-Modification Outstanding Recorded Balance	$0	$1,292
Post-Modification Outstanding Recorded Balance	0	1,042
Commercial & Industrial
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0
Pre-Modification Outstanding Recorded Balance	0	0
Post-Modification Outstanding Recorded Balance	0	0
Commercial Real Estate Owner Occupied
Financing Receivable, Modifications [Line Items]
Number of Loans	0	2
Pre-Modification Outstanding Recorded Balance	0	1,292
Post-Modification Outstanding Recorded Balance	0	1,042
Commercial Real Estate Investor Owned
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0
Pre-Modification Outstanding Recorded Balance	0	0
Post-Modification Outstanding Recorded Balance	0	0
Construction and Land Development
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0
Pre-Modification Outstanding Recorded Balance	0	0
Post-Modification Outstanding Recorded Balance	0	0
Residential Real Estate
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0
Pre-Modification Outstanding Recorded Balance	0	0
Post-Modification Outstanding Recorded Balance	0	0
Consumer & Other
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0
Pre-Modification Outstanding Recorded Balance	0	0
Post-Modification Outstanding Recorded Balance	$0	$0

Portfolio_Loans_Summary_of_Agi

Portfolio Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Portfolio loans, including unearned loan costs	$2,435,559	$2,433,916
Non-Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	4,190	4,964
90 or More Days Past Due	6,402	7,702
Total Past Due	10,592	12,666
Current	2,424,967	2,421,250
Total	2,434,594	2,433,021
Portfolio loans, including unearned loan costs	2,435,559	2,433,916
Non-Covered Loans | Commercial & Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	2,931	3,059
90 or More Days Past Due	932	232
Total Past Due	3,863	3,291
Current	1,261,241	1,266,968
Total	1,265,104	1,270,259
Non-Covered Loans | Commercial Real Estate Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	267	766
90 or More Days Past Due	267	496
Total Past Due	534	1,262
Current	367,779	356,241
Total	368,313	357,503
Non-Covered Loans | Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	261
90 or More Days Past Due	0	4,450
Total Past Due	0	4,711
Current	413,170	408,315
Total	413,170	413,026
Non-Covered Loans | Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	702
90 or More Days Past Due	3,226	2,524
Total Past Due	3,226	3,226
Current	135,698	141,547
Total	138,924	144,773
Non-Covered Loans | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	974	168
90 or More Days Past Due	1,977	0
Total Past Due	2,951	168
Current	177,302	185,084
Total	180,253	185,252
Non-Covered Loans | Consumer & Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	18	8
90 or More Days Past Due	0	0
Total Past Due	18	8
Current	69,777	63,095
Total	68,830	62,208
Portfolio loans, including unearned loan costs	$69,795	$63,103

Portfolio_Loans_Summary_of_Rec3

Portfolio Loans - Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan costs	$2,435,559	$2,433,916
Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	2,434,594	2,433,021
Portfolio loans, including unearned loan costs	2,435,559	2,433,916
Non-Covered Loans | Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	1,265,104	1,270,259
Non-Covered Loans | Commercial Real Estate Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	368,313	357,503
Non-Covered Loans | Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	413,170	413,026
Non-Covered Loans | Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	138,924	144,773
Non-Covered Loans | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	180,253	185,252
Non-Covered Loans | Consumer & Other
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	68,830	62,208
Portfolio loans, including unearned loan costs	69,795	63,103
Pass (1-6) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan costs	2,223,578	2,229,430
Pass (1-6) | Non-Covered Loans | Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	1,149,860	1,167,751
Pass (1-6) | Non-Covered Loans | Commercial Real Estate Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	346,073	334,347
Pass (1-6) | Non-Covered Loans | Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	378,017	372,818
Pass (1-6) | Non-Covered Loans | Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	117,768	123,260
Pass (1-6) | Non-Covered Loans | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	162,387	168,543
Pass (1-6) | Non-Covered Loans | Consumer & Other
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan costs	69,473	62,711
Watch (7) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan costs	151,004	128,484
Watch (7) | Non-Covered Loans | Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	84,786	62,315
Watch (7) | Non-Covered Loans | Commercial Real Estate Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	17,730	18,025
Watch (7) | Non-Covered Loans | Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	23,581	24,088
Watch (7) | Non-Covered Loans | Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	13,178	12,993
Watch (7) | Non-Covered Loans | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	11,681	11,012
Watch (7) | Non-Covered Loans | Consumer & Other
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan costs	48	51
Substandard (8) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan costs	59,616	76,002
Substandard (8) | Non-Covered Loans | Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	29,799	40,193
Substandard (8) | Non-Covered Loans | Commercial Real Estate Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	4,510	5,131
Substandard (8) | Non-Covered Loans | Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	11,572	16,120
Substandard (8) | Non-Covered Loans | Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	7,276	8,520
Substandard (8) | Non-Covered Loans | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	6,185	5,697
Substandard (8) | Non-Covered Loans | Consumer & Other
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan costs	274	341
Doubtful (9) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan costs	1,361	0
Doubtful (9) | Non-Covered Loans | Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	659	0
Doubtful (9) | Non-Covered Loans | Commercial Real Estate 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	702	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 & Other
Financing Receivable, Recorded Investment [Line Items]
Portfolio loans, including unearned loan costs	$0	$0

Purchase_Credit_Impaired_PCI_L2

Purchase Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) (Covered Loans, USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Covered Loans [Line Items]
Recorded Investment PCI Loans	$94,788	$99,103
Construction and Land Development
Covered Loans [Line Items]
Weighted- Average Risk Rating	6.26	6.16
Recorded Investment PCI Loans	7,574	7,740
Commercial Real Estate Investor Owned
Covered Loans [Line Items]
Weighted- Average Risk Rating	7.12	7.07
Recorded Investment PCI Loans	37,524	39,066
Commercial Real Estate Owner Occupied
Covered Loans [Line Items]
Weighted- Average Risk Rating	6.39	6.35
Recorded Investment PCI Loans	20,935	22,695
Residential Real Estate
Covered Loans [Line Items]
Weighted- Average Risk Rating	5.52	5.54
Recorded Investment PCI Loans	24,314	25,121
Total real estate loans
Covered Loans [Line Items]
Recorded Investment PCI Loans	90,347	94,622
Commercial & Industrial
Covered Loans [Line Items]
Weighted- Average Risk Rating	6.67	6.57
Recorded Investment PCI Loans	4,125	4,012
Consumer and other
Covered Loans [Line Items]
Weighted- Average Risk Rating	5.29	5.39
Recorded Investment PCI Loans	$316	$469

Purchase_Credit_Impaired_PCI_L3

Purchase Credit Impaired ("PCI") Loans - Summary of Aging of Recorded Investment in Past Due PCI Loans by Portfolio Class and Category (Details) (Covered Loans, USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	$854	$3,672
90 or More Days Past Due	13,921	10,722
Total Past Due	14,775	14,394
Current	80,013	84,709
Total	94,788	99,103
Commercial & Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	0
90 or More Days Past Due	6	16
Total Past Due	6	16
Current	4,119	3,996
Total	4,125	4,012
Commercial Real Estate Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	0
90 or More Days Past Due	3,115	2,759
Total Past Due	3,115	2,759
Current	17,820	19,936
Total	20,935	22,695
Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	878
90 or More Days Past Due	7,953	6,484
Total Past Due	7,953	7,362
Current	29,571	31,704
Total	37,524	39,066
Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	396	774
90 or More Days Past Due	0	0
Total Past Due	396	774
Current	7,178	6,966
Total	7,574	7,740
Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	448	2,020
90 or More Days Past Due	2,847	1,451
Total Past Due	3,295	3,471
Current	21,019	21,650
Total	24,314	25,121
Consumer & Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	10	0
90 or More Days Past Due	0	12
Total Past Due	10	12
Current	306	457
Total	$316	$469

Purchase_Credit_Impaired_PCI_L4

Purchase Credit Impaired ("PCI") Loans - Rollforward of PCI Loans, Net of Allowance for Loan Losses (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$83,693	$125,100
Principal reductions and interest payments	-6,148	-9,849
Accretion of loan discount	3,088	4,560
Changes in contractual and expected cash flows due to remeasurement	5,511	-539
Reductions due to disposals	-2,981	-9,113
Balance at end of period	83,163	110,159
Contractual Cashflows
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	178,145	266,068
Principal reductions and interest payments	-6,148	-9,849
Accretion of loan discount	0	0
Changes in contractual and expected cash flows due to remeasurement	-12,159	4,888
Reductions due to disposals	-5,623	-14,297
Balance at end of period	154,215	246,810
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	65,719	87,438
Principal reductions and interest payments	0	0
Accretion of loan discount	0	0
Changes in contractual and expected cash flows due to remeasurement	-26,187	10,503
Reductions due to disposals	-1,709	-3,142
Balance at end of period	37,823	94,799
Accretable Yield
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	28,733	53,530
Principal reductions and interest payments	0	0
Accretion of loan discount	-3,088	-4,560
Changes in contractual and expected cash flows due to remeasurement	8,517	-5,076
Reductions due to disposals	-933	-2,042
Balance at end of period	$33,229	$41,852

Purchase_Credit_Impaired_PCI_L5

Purchase Credit Impaired ("PCI") Loans - Summary of FDIC Loss Share Receivable (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
FDIC Indemnification Asset [Roll Forward]
Balance at beginning of period	$15,866
Cash received from the FDIC for covered assets	-1,395	-2,255
FDIC reimbursable losses, net	-563
Amortization, net	900
Loan impairment	-2,589
Reductions for payments on covered assets in excess of expected cash flows	-575
Balance at end of period	$11,644

Purchase_Credit_Impaired_PCI_L6

Purchase Credit Impaired ("PCI") Loans - Narrative (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Receivables [Abstract]
PCI loans outstanding	$127.70	$135.30

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Details) (Non-designated hedging instruments, Client-Related, Interest rate swap contracts, USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Summary of Derivative Instruments [Abstract]
Notional Amount	$136,924	$141,263
Other Assets
Summary of Derivative Instruments [Abstract]
Asset derivatives (other assets), fair value	1,176	907
Other Liabilities
Summary of Derivative Instruments [Abstract]
Liability derivatives (other liabilities), fair value	$1,176	$907

Fixed_Assets_Summary_of_Fixed_

Fixed Assets - Summary of Fixed Assets (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Property, Plant and Equipment [Abstract]
Fixed assets, net	$14,911	$14,753

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$30,334		$30,334
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$284	$383

Maturity_of_Certificates_of_De

Maturity of Certificates of Deposit (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
$100,000 and Over
Time Deposits, $100,000 or More	$441,775	$377,544
Other
Time Deposits, Less than $100,000	$123,723	$127,808

Subordinated_Debentures_Detail

Subordinated Debentures (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2015
Subordinated Borrowing [Line Items]
Subordinated debentures	$56,807			$56,807
Conversion of subordinated debt into common stock (in shares)	287,852	1,176,470	0

Other_Borrowings_and_Notes_Pay

Other Borrowings and Notes Payable (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Total	$181,164	$234,183

Commitments_Details

Commitments (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Schedule of Commitments [Line Items]
Unadvanced commitments on impaired loans	0
Commitments to extend credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	995,715,000	947,424,000
Standby letters of credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	52,981,000	50,108,000
Standby letters of credit | Maximum
Schedule of Commitments [Line Items]
Remaining term	3 years 2 months
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	200,000
Fixed Rate Loan Commitment | Commitments to extend credit
Schedule of Commitments [Line Items]
Off-balance sheet financial instruments, contractual amounts	73,000,000	$65,900,000

Fair_Value_Measurements_Summar

Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets
Securities available for sale	$410,061	$400,146
State tax credits held for sale	10,286	10,286	11,689
Portion at Other than Fair Value, Fair Value Disclosure
Assets
State tax credits held for sale	32,100
Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	410,061	400,146
State tax credits held for sale	46,851	42,970
Derivative financial instruments	1,176	909
Liabilities
Derivative financial instruments	1,176	907
Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	100,899	91,826
Obligations of states and political subdivisions
Assets
Securities available for sale	35,047	34,881
Residential mortgage-backed securities
Assets
Securities available for sale	274,115	273,439
Recurring basis | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	410,061	400,146
State tax credits held for sale	10,286	11,689
Derivative financial instruments	1,176	909
Total assets	421,523	412,744
Liabilities
Derivative financial instruments	1,176	907
Total liabilities	1,176	907
Recurring basis | Obligations of U.S. Government-sponsored enterprises | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	100,899	91,826
Recurring basis | Obligations of states and political subdivisions | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	35,047	34,881
Recurring basis | Residential mortgage-backed securities | Estimate of Fair Value Measurement [Member]
Assets
Securities available for sale	274,115	273,439
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Securities available for sale	0	0
Loans Receivable, Fair Value Disclosure		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	406,990	397,087
Loans Receivable, Fair Value Disclosure		0
State tax credits held for sale	0	0
Derivative financial instruments	1,176	909
Total assets	408,166	397,996
Liabilities
Derivative financial instruments	1,176	907
Total liabilities	1,176	907
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. Government-sponsored enterprises
Assets
Securities available for sale	100,899	91,826
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions
Assets
Securities available for sale	31,976	31,822
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
Assets
Securities available for sale	274,115	273,439
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets
Securities available for sale	3,071	3,059
Loans Receivable, Fair Value Disclosure		0
State tax credits held for sale	10,286	11,689
Derivative financial instruments	0	0
Total assets	13,357	14,748
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	3,071	3,059
Recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities
Assets
Securities available for sale	0	0
Recurring basis | Estimate of Fair Value Measurement [Member]
Assets
Loans Receivable, Fair Value Disclosure		$0

Fair_Value_Measurements_Narrat

Fair Value Measurements - Narrative (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State tax credits held for sale, including $10,286 and $11,689 carried at fair value, respectively	$42,411		$38,309
State tax credits, held for sale, carried at fair value	10,286		10,286	11,689
State tax credit term	10 years
Years of tax credits generated	10 years
Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State tax credits held for sale, including $10,286 and $11,689 carried at fair value, respectively	42,400
Recurring basis | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State tax credits, held for sale, carried at fair value	10,286		11,689
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	3
Portion at Other than Fair Value, Fair Value Disclosure
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State tax credits, held for sale, carried at fair value	32,100
Estimated fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State tax credits, held for sale, carried at fair value	46,851		42,970
Estimated fair value | Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
State tax credits, held for sale, carried at fair value	10,286		11,689
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 relating to assets still held at the reporting date	($274)	$334
Minimum | State tax credits held for sale, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	2.30%
Maximum | State tax credits held for sale, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	4.82%
LIBOR | LIBOR Swap Curve [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate basis point spread	2.05
Discount rate basis spread on variable rate	205.00%		205.00%
Lower range of basis spread on variable rate	265.00%
Higher range of basis spread on variable rate	285.00%
Prime Rate | State tax credits held for sale, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate basis spread on variable rate	75.00%
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_Schedu

Fair Value Measurements - Schedule of Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis (Details) (Level 3, Recurring basis, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Securities available for sale, at fair value
Level 3 Financial Instruments Measured at Fair Value
Beginning balance	$3,059	$3,040
Total gains:
Included in other comprehensive income	12	6
Purchases, sales, issuances and settlements:
Purchases	0	0
Transfer in and/or out of Level 3	0	0
Ending balance	3,071	3,046
Change in unrealized gains relating to assets still held at the reporting date	-12	-6
State tax credits held for sale, at fair value
Level 3 Financial Instruments Measured at Fair Value
Beginning balance	11,689	16,491
Total gains:
Total gains:	128	118
Purchases, sales, issuances and settlements:
Sales	-1,531	-1,709
Ending balance	10,286	14,900
Change in unrealized gains relating to assets still held at the reporting date	($274)	$334

Fair_Value_Measurements_Summar1

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, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total (losses) gains for the year	($2,609)
Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total (losses) gains for the year	-2,568
Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total (losses) gains for the year	-41
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
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
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
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	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
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
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	8,882
Significant Unobservable Inputs (Level 3) | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	8,419
Significant Unobservable Inputs (Level 3) | Other real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate	463
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	8,882
Estimate of Fair Value Measurement [Member] | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	8,419
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	$463

Fair_Value_Measurements_Summar2

Fair Value Measurements - Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Balance sheet assets
Securities available for sale	$410,061	$400,146
Securities held to maturity	45,563	45,985
State tax credits held for sale	10,286	10,286	11,689
Carrying Amount
Balance sheet assets
Cash and due from banks	56,420	42,903
Federal funds sold	48	35
Interest-bearing deposits	43,865	63,058
Securities available for sale	410,061	400,146
Securities held to maturity	45,563	45,985
Other investments, at cost	11,719	17,037
Loans held for sale	7,843	4,033
Derivative financial instruments	1,176	909
Portfolio loans, net	2,488,434	2,487,424
State tax credits held for sale	42,411	38,309
Accrued interest receivable	8,061	7,956
Balance sheet liabilities
Deposits	2,674,631	2,491,510
Subordinated debentures	56,807	56,807
Federal Home Loan Bank advances	6,000	144,000
Other borrowings	186,864	239,883
Derivative financial instruments	1,176	907
Accrued interest payable	845	843
Estimated fair value
Balance sheet assets
Cash and due from banks	56,420	42,903
Federal funds sold	48	35
Interest-bearing deposits	43,865	63,058
Securities available for sale	410,061	400,146
Securities held to maturity	45,811	45,795
Other investments, at cost	11,719	17,037
Loans held for sale	7,843	4,033
Derivative financial instruments	1,176	909
Portfolio loans, net	2,483,751	2,482,700
State tax credits held for sale	46,851	42,970
Accrued interest receivable	8,061	7,956
Balance sheet liabilities
Deposits	2,677,798	2,494,624
Subordinated debentures	34,557	34,124
Federal Home Loan Bank advances	6,000	144,000
Other borrowings	186,937	239,950
Derivative financial instruments	1,176	907
Accrued interest payable	$845	$843

Fair_Value_Measurements_Schedu1

Fair Value Measurements - Schedule of Estimated Fair Values of Financial Instruments Not Recorded at Fair Value on Balance Sheet (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
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	$45,811	$45,795
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	2,483,751	2,482,700
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	36,565	31,281
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	2,677,798	2,494,624
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	34,557	34,124
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	6,000	144,000
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	186,937	239,950
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	2,109,133	1,986,158
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	45,811	45,795
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	34,557	34,124
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	6,000	144,000
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	186,937	239,950
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	2,483,751	2,482,700
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	36,565	31,281
Level 3 | Deposits
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial liabilities not on condensed consolidated balance sheets at fair value	568,665	508,466
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

Quarterly_Condensed_Financial_

Quarterly Condensed Financial Information (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Interest income	$32,151	$34,024
Interest expense	3,106	3,658
Net interest income	29,045	30,366
Provision for loan losses not covered under FDIC loss share	1,580	1,027
Provision (benefit) for loan losses covered under FDIC loss share	-3,270	3,304
Net interest income after provision for loan losses	30,735	26,035
Noninterest income	3,583	3,922
Noninterest expense	19,950	21,102
Income before income tax expense	14,368	8,855
Income tax expense	5,022	3,007
Net income	$9,346	$5,848
Earnings per common share:
Basic (usd per share)	$0.47	$0.30
Diluted (usd per share)	$0.46	$0.30