BNC Bancorp (BNNC) 10-Q 8 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	5-May-15
Document and entity [Abstract]
Entity Registrant Name	BNC Bancorp
Entity Central Index Key	1210227
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		32,580,255

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Assets
Cash and due from banks	$40,957	$44,659
Interest-earning deposits in other banks	55,281	40,535
Investment securities available-for-sale, at fair value	290,591	269,290
Investment securities held-to-maturity, at amortized cost (fair value of $230,785 and $241,997 at March 31, 2015 and December 31, 2014, respectively)	224,734	237,092
Federal Home Loan Bank stock, at cost	6,638	10,562
Loans held for sale	25,505	37,280
Loans:
Originated loans	2,262,601	2,116,441
Acquired loans	913,236	958,657
Less allowance for loan losses	-29,351	-30,399
Net loans	3,146,486	3,044,699
Accrued interest receivable	13,186	14,514
Premises and equipment, net	87,928	87,761
Other real estate owned	39,427	42,531
FDIC indemnification asset	4,839	5,097
Investment in bank-owned life insurance	94,102	93,396
Goodwill and other intangible assets, net	82,861	83,701
Other assets	60,928	61,391
Total assets	4,173,463	4,072,508
Deposits:
Non-interest bearing demand	544,189	534,792
Interest-bearing demand	1,685,200	1,657,931
Time deposits	1,323,537	1,203,674
Total deposits	3,552,926	3,396,397
Short-term borrowings	61,654	127,934
Long-term debt	134,005	133,814
Accrued expenses and other liabilities	25,766	23,975
Total liabilities	3,774,351	3,682,120
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred stock, no par value; authorized 20,000,000 shares; 0 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively	0	0
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, no par value; authorized 60,000,000 shares; 27,895,609 and 27,777,737 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively	283,184	281,488
Common stock, non-voting, no par value; authorized 20,000,000 shares; 4,820,844 shares issued and outstanding at March 31, 2015 and December 31, 2014	33,507	33,507
Retained earnings	72,334	65,211
Stock in directors rabbi trust	-4,949	-3,429
Directors deferred fees obligation	4,949	3,429
Accumulated other comprehensive income	10,087	10,182
Total shareholders' equity	399,112	390,388
Total liabilities and shareholders' equity	$4,173,463	$4,072,508

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Held-to-maturity Securities, Fair Value	$230,785	$241,997
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock, Par or Stated Value Per Share	$0	$0
Preferred Stock, Shares Authorized	20,000,000	20,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common stock
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock, No Par Value	$0	$0
Common Stock, Shares Authorized	60,000,000	60,000,000
Common Stock, Shares, Issued	27,895,609	27,777,737
Common Stock, Shares, Outstanding	27,895,609	27,777,737
Common stock - nonvoting
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock, No Par Value	$0	$0
Common Stock, Shares Authorized	20,000,000	20,000,000
Common Stock, Shares, Issued	4,820,844	4,820,844
Common Stock, Shares, Outstanding	4,820,844	4,820,844

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest income:
Loans, including fees	$39,420	$31,115
Investment securities:
Taxable	1,166	1,086
Tax-exempt	3,181	3,389
Interest-earning balances and other	120	128
Total interest income	43,887	35,718
Interest expense:
Demand deposits	1,704	1,550
Time deposits	2,738	2,388
Short-term borrowings	63	112
Long-term debt	1,312	954
Total interest expense	5,817	5,004
Net interest income	38,070	30,714
Provision for loan losses	110	2,561
Net interest income after provision for loan losses	37,960	28,153
Non-interest income:
Mortgage fees	2,499	1,558
Service charges	1,644	1,348
Earnings on bank-owned life insurance	654	580
Gain (loss) on sale of investment securities, net	49	-565
Other	1,454	2,204
Total non-interest income	6,300	5,125
Non-interest expense:
Salaries and employee benefits	17,410	13,709
Occupancy	2,581	2,079
Furniture and equipment	1,628	1,598
Data processing and supplies	1,161	904
Advertising and business development	646	689
Insurance, professional and other services	2,259	1,508
FDIC insurance assessments	735	705
Loan, foreclosure and other real estate owned expenses	2,325	1,362
Other	3,246	2,217
Total non-interest expense	31,991	24,771
Income before income tax expense	12,269	8,507
Income tax expense	3,511	2,023
Net income	$8,758	$6,484
Earnings Per Share [Abstract]
Basic (USD per share)	$0.27	$0.24
Diluted (USD per share)	$0.27	$0.24
Dividends Declared and Paid (USD per share)	$0.05	$0.05

Consolidated_Statements_of_Com

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	$8,758	$6,484
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]
Unrealized holding gains on investments securities available-for-sale	1,354	5,803
Tax effect	-501	-2,147
Reclassification of (gains) losses recognized in net income	-49	565
Tax effect	-18	209
Amortization of unrealized gains on investment securities transferred from available-for-sale to held-to-maturity	-161	-334
Tax effect	60	124
Net of tax amount	721	3,802
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Unrealized holding losses	-1,296	-914
Tax effect	480	338
Reclassification of losses recognized in net income	0	457
Tax effect	0	-171
Net of tax amount	-816	-290
Total other comprehensive income (loss)	-95	3,512
Total comprehensive income	$8,663	$9,996

Consolidated_Statements_of_Sha

Consolidated Statements of Shareholders' Equity (USD $)	Total	Common stock	Retained earnings	Stock in directors rabbi trust	Directors deferred fees obligation	Accumulated other comprehensive income	Common stock - nonvoting
In Thousands, except Share data, unless otherwise specified							Common stock
Beginning Balance, Value at Dec. 31, 2013	$271,330	$181,684	$41,559	($3,143)	$3,143	$3,306	$44,781
Beginning Balance Shares at Dec. 31, 2013		21,310,832					5,992,213
Net income	6,484		6,484
Directors deferred fees	0			71	-71
Other comprehensive income, net of tax	3,512					3,512
Common Stock Issued Pursuant To [Abstract]
Stock-based Compensation, Shares		16,500
Stock-Based Compensation, Value	464	464
Dividend Reinvestment Plan, Shares		4,912
Dividend Reinvestment Plan, Values	84	84
Cash Dividends:
Common Stock, Cash Dividend Per Share	-1,366		-1,366
Ending Balance, Value at Mar. 31, 2014	280,508	182,232	46,677	-3,072	3,072	6,818	44,781
Ending Balance, Shares at Mar. 31, 2014		21,332,244					5,992,213
Beginning Balance, Value at Dec. 31, 2014	390,388	281,488	65,211	-3,429	3,429	10,182	33,507
Beginning Balance Shares at Dec. 31, 2014		27,777,737					4,820,844
Net income	8,758		8,758
Directors deferred fees	0			-1,520	1,520
Other comprehensive income, net of tax	-95					-95
Common Stock Issued Pursuant To [Abstract]
Stock-based Compensation, Shares		17,963
Stock-Based Compensation, Value	720	720
Dividend Reinvestment Plan, Shares		5,102
Dividend Reinvestment Plan, Values	84	84
Exercised (in shares)		156,125
Stock Options Exercised Values	1,907	1,907
Shares Withheld for Payment of Taxes Shares		-1,131
Shares Withheld for Payment of Taxes Value	-19	-19
Shares Traded to Exercise Options Shares		-60,187
Shares Traded to Exercise Options Value	-1,047	-1,047
Excess income tax benefit	51	51
Cash Dividends:
Common Stock, Cash Dividend Per Share	-1,635		-1,635
Ending Balance, Value at Mar. 31, 2015	$399,112	$283,184	$72,334	($4,949)	$4,949	$10,087	$33,507
Ending Balance, Shares at Mar. 31, 2015		27,895,609					4,820,844

Consolidated_Statements_of_Sha1

Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Cash Paid	$0.05	$0.05

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net income	$8,758	$6,484
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	110	2,561
Depreciation and amortization	1,472	1,328
Amortization of premiums, net	958	1,103
Amortization of intangible assets	840	369
Accretion of fair value purchase accounting adjustments	-5,362	-3,360
Cash flow hedge expense	0	163
Stock-based compensation	720	464
Deferred compensation	103	126
Earnings on bank-owned life insurance	-654	-580
(Gain) loss on sale of investment securities, net	-49	565
(Gain) loss on disposal of premises and equipment	-4	14
Losses on other real estate owned	1,156	594
Gain on sale of loans (mortgage fees)	-2,499	-1,558
Origination of loans held for sale	-74,921	-61,931
Proceeds from sales of loans held for sale	89,922	69,412
Decrease in accrued interest receivable	1,328	1,790
Payments received from FDIC under loss-share agreements	611	2,848
(Increase) decrease in other assets	-432	3,569
Increase (decrease) in accrued expenses and other liabilities	1,406	-5,127
Net cash provided by operating activities	23,463	18,834
Investing activities
Purchases of investment securities available-for-sale	-46,928	-8,298
Proceeds from sales of investment securities available-for-sale	14,535	30,682
Proceeds from sales of investment securities held-to-maturity	0	3,476
Proceeds from maturities and payments of investment securities available-for-sale	11,974	6,410
Proceeds from maturities and payments of investment securities held-to-maturity	11,711	1,987
Redemption of Federal Home Loan Bank stock	3,924	4,750
Net increase in loans	-100,512	-27,311
Purchases of premises and equipment	-1,529	-1,149
Proceeds from disposal of premises and equipment	25	0
Investment in bank-owned life insurance	-52	-52
Investment in other real estate owned	-435	-210
Proceeds from sales of other real estate owned	4,748	7,424
Net cash provided by (used in) investing activities	-102,539	17,709
Financing activities
Net increase in deposits	156,942	49,683
Net decrease in short-term borrowings	-66,280	-77,680
Net increase in long-term-debt	168	0
Common stock issued from exercise of stock options	860	0
Common stock issued pursuant to dividend reinvestment plan	84	84
Common stock repurchased in lieu of income taxes	-19	0
Cash dividends paid, net of accretion	-1,635	-1,366
Net cash provided by (used in) financing activities	90,120	-29,279
Net increase in cash and cash equivalents	11,044	7,264
Cash and cash equivalents, beginning of period	85,194	108,390
Cash and cash equivalents, end of period	96,238	115,654
Supplemental Statement of Cash Flows Disclosure
Interest paid	5,113	5,333
Income taxes paid	520	75
Summary of Noncash Investing and Financing Activities
Transfer of loans to other real estate owned	3,093	5,313
Transfer of loans held for sale to loans	727	6,081
FDIC indemnification asset increase for losses, net	$617	$917

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of presentation	Organization
	BNC Bancorp (the “Company”) is a bank holding company for Bank of North Carolina (“BNC”), a wholly owned subsidiary, headquartered in High Point, North Carolina. BNC is a full service commercial bank providing commercial banking services tailored to the particular banking needs of the communities it serves in North and South Carolina. BNC’s primary source of revenue is derived from loans to customers, who are predominantly individuals and small to medium size businesses in BNC’s market areas.
	The Company is subject to the rules and regulations of the Federal Reserve Bank. BNC is operating under the banking laws of North Carolina, and is subject to the rules and regulations of the North Carolina Commissioner of Banks and the Federal Deposit Insurance Corporation (“FDIC”). Accordingly, the Company and BNC are examined periodically by those regulatory authorities.
	These consolidated financial statements and notes are presented in accordance with the instructions for Form 10-Q and, therefore, do not include all information and notes necessary for a complete presentation of financial position, results of operations and cash flow activity required in accordance with accounting principles generally accepted in the United States of America (“GAAP”). In the opinion of management, all normal recurring adjustments necessary for a fair statement of the consolidated financial position and consolidated results of operations have been made. The information contained in the consolidated financial statements and footnotes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 should be referred to in connection with these unaudited interim consolidated financial statements.
	Certain amounts in the 2014 consolidated financial statements have been reclassified to conform to 2015 presentation. These reclassifications had no effect on net income, net income or shareholders' equity as previously reported.
	The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. On an ongoing basis, the Company evaluates its estimates, including those relating to the allowance for loan losses, determination of fair value of acquired assets and assumed liabilities, and valuation of goodwill and intangible assets.
	Recently Adopted and Issued Accounting Standards
	In April 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2015-03, Simplifying the Presentation of Debt Issuance Costs, which amends the presentation of debt issuance costs in the balance sheet as a direct deduction from the related debt liability. This update affects disclosures related to debt issuance costs but does not affect existing recognition and measurement guidance for these items. ASU 2015-03 is effective for annual and interim periods beginning after December 15, 2015. The Company does not expect the adoption of this ASU to have a material impact on the its consolidated financial statements.
	In February 2015, the FASB issued ASU 2015-02 Consolidation (Topic 810): Amendments to the Consolidation Analysis, which amends the consolidation analysis required under GAAP. The revised guidance amends the consolidation analysis based on certain fee arrangements or relationships to the reporting entity and, for limited partnerships, requires entities to consider the limited partner’s rights relative to the general partner. Although the amendments are expected to result in the deconsolidation of many entities, the Company will need to reevaluate all its previous consolidation conclusions. ASU 2015-02 is effective for annual and interim periods beginning after December 15, 2015, with early adoption permitted (including during an interim period), provided that the guidance is applied as of the beginning of the annual period containing the adoption date. The Company is currently evaluating the impact the adoption of this ASU will have on its consolidated financial statements.
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). This ASU was developed as a joint project with the International Accounting Standards Board to remove inconsistencies in revenue requirements and provide a more robust framework for addressing revenue issues. The ASU’s core principle is that an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. The ASU is effective for public entities for annual and interim periods beginning after December 15, 2016. The ASU may be adopted using either a modified retrospective method or a full retrospective method and early adoption is not permitted. The Company is currently evaluating the impact the adoption of this ASU will have on its consolidated financial statements.
	In January 2014, the FASB issued ASU No. 2014-04, Receivables (Topic 310): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure, to clarify that an in substance repossession or foreclosure occurs upon either the creditor obtaining legal title to the residential real estate property or the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. The amendments are effective for annual periods, and interim reporting periods within those annual periods, beginning after December 15, 2014. The amendments may be adopted using either a modified retrospective transition method or a prospective transition method and early adoption is permitted. The adoption of this ASU did not have a material impact on the Company's consolidated financial statements.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Acquisitions	NOTE 2 – ACQUISITIONS
	Pending Acquisition of Valley Financial Corporation
	On November 17, 2014, the Company entered into an Agreement and Plan of Merger with Valley Financial Corporation ("Valley"), the holding company for Valley Bank, a commercial bank with nine branches located in Roanoke and Salem, Virginia.
	Under the merger agreement, Valley's shareholders will receive a fixed price of $20.50 for each share of Valley common stock, payable in shares of the Company's voting common stock, based upon the 20-day volume weighted average price of the Company's common stock prior to the closing of the merger, subject to maximum and minimum exchange ratios. The Company anticipates that the acquisition will close in the third quarter of 2015, subject to customary closing conditions, including regulatory approval and approval of both the Company and Valley’s shareholders.
	Acquisition of Harbor Bank Group, Inc.
	On December 1, 2014, the Company completed the acquisition of Harbor Bank Group, Inc., the holding company for Harbor National Bank ("Harbor"). Under the merger agreement, Harbor's shareholders received 0.950 shares of the Company's voting common stock for each share of Harbor common stock owned.
	A summary of assets received and liabilities assumed for Harbor, as well as the associated fair value adjustments, are as follows:
		As Recorded by Harbor			Fair				As Recorded
					Value Adjustments				by BNC
	Assets	(Dollars in thousands)
	Cash and due from banks	$	5,833		$	—			$	5,833
	Investment securities available-for-sale	9,200			—				9,200
	Federal Home Loan Bank stock, at cost	1,259			—				1,259
	Loans	293,848			(4,207		)	-1	289,641
	Premises and equipment	1,801			—				1,801
	Accrued interest receivable	643			—				643
	Other real estate owned	11			—				11
	Core deposit intangible	—			3,700			-2	3,700
	Other assets	6,718			381			-3	7,099
	Total assets acquired	$	319,313		$	(126	)		319,187
	Liabilities
	Deposits	$	(254,521	)	$	(253	)	-4	(254,774		)
	Borrowings	(29,720		)	(184		)	-5	(29,904		)
	Other liabilities	(2,268		)	(85		)	-6	(2,353		)
	Total liabilities assumed	$	(286,509	)	$	(522	)		(287,031		)
	Net assets acquired								32,156
	Total consideration paid (3,082,714 shares of voting common stock)								51,003
	Goodwill								$	18,847
	Explanation of fair value adjustments:
	-1	Adjustment for the fair value of the loan portfolio.
	-2	Adjustment for the fair value of the core deposit intangible.
	-3	Adjustment for the deferred tax asset recognized from acquisition.
	-4	Adjustment for the fair value of time deposits.
	-5	Adjustment for the fair value of borrowings assumed.
	-6	Adjustment for the fair value of leases acquired.
	With this acquisition, the Company expanded its presence in Charleston, South Carolina through the addition of four branches, a low-cost base of core deposits and an experienced in-market team that enhances our ability to grow in that market. Additionally, goodwill was also created by the expected cost savings that will be recognized in future periods through the elimination of redundant operations. None of the goodwill associated with this acquisition is deductible for income tax purposes. All goodwill related to this acquisition was allocated to the banking operations reporting unit.
	Acquisition of Community First Financial Group, Inc.
	On June 1, 2014, the Company completed the acquisition of Community First Financial Group, Inc. ("Community First"), the parent company of Harrington Bank, FSB, pursuant to the terms of the Agreement and Plan of Merger dated December 17, 2013.
	Community First shareholders could elect to receive 0.4069 shares of the Company's voting common stock for each share of Community First common stock or cash in the amount of $5.90 per share, subject to allocation and pro-rata procedures to ensure that approximately 75% of Community First common shares were converted into the right to receive the Company's voting common stock, while the remaining 25% were converted into the right to receive cash. As part of the closing, Community First's preferred shareholders received cash payments equal to the liquidation value of their preferred shares.
	A summary of assets received and liabilities assumed for Community First, as well as the associated fair value adjustments, are as follows:
		As Recorded by			Fair				As Recorded
		Community First			Value Adjustments				by BNC
	Assets	(Dollars in thousands)
	Cash and due from banks	$	47,330		$	—			$	47,330
	Investment securities available-for-sale	12,000			—				12,000
	Federal Home Loan Bank stock, at cost	293			—				293
	Loans	152,885			(15,139		)	-1	137,746
	Premises and equipment	545			(131		)	-2	414
	Accrued interest receivable	436			—				436
	Other real estate owned	1,419			(271		)	-3	1,148
	Core deposit intangible	—			3,624			-4	3,624
	Other assets	6,849			4,552			-5	11,401
	Total assets acquired	$	221,757		$	(7,365	)		214,392
	Liabilities
	Deposits	$	(191,486	)	$	(180	)	-6	(191,666		)
	Borrowings	(4,560		)	—				(4,560		)
	Other liabilities	(1,063		)	(205		)	-7	(1,268		)
	Total liabilities assumed	$	(197,109	)	$	(385	)		(197,494		)
	Net assets acquired								16,898
	Total consideration paid								26,734
	Goodwill								$	9,836
	Explanation of fair value adjustments:
	-1	Adjustment for the fair value of the loan portfolio.
	-2	Adjustment for the fair value of premises and equipment.
-3	Adjustment for the fair value of other real estate owned.
-4	Adjustment for the fair value of the core deposit intangible.
-5	Adjustment for the deferred tax asset recognized from acquisition.
-6	Adjustment for the fair value of time deposits.
-7	Adjustment for the fair value of leases acquired.
A summary of the consideration paid is as follows:
	(Dollars in thousands)
Common stock issued (1,190,763 shares)	$	20,128
Redemption of preferred stock	850
Cash payments to common shareholders	5,756
Total consideration paid	$	26,734
With this acquisition, the Company expanded its presence in the Raleigh-Durham-Chapel Hill area of North Carolina through the addition of three branches, a low-cost base of core deposits and an experienced in-market team that enhances our ability to grow in that market. Additionally, goodwill was also created by the expected cost savings that will be recognized in future periods through the elimination of redundant operations. None of the goodwill associated with this acquisition is deductible for income tax purposes. All goodwill related to this acquisition was allocated to the banking operations reporting unit.
Acquisition of South Street Financial Corp.
On April 1, 2014, the Company completed the acquisition of South Street Financial Corp. ("South Street"), the parent company of Home Savings Bank of Albermarle, Inc. SSB, pursuant to the terms of the Agreement and Plan of Merger dated December 17, 2013.
South Street shareholders could elect to receive 0.60 shares of the Company's voting common stock for each share of South Street common stock owned, or cash in the amount of $8.85 per share. Eighty percent of South Street's common shares were converted into the right to receive the Company's voting common stock, while the remaining 20% were converted into the right to receive cash. As part of the closing, each share of South Street's Series A Preferred Stock automatically converted into one share of South Street common stock.
A summary of assets received and liabilities assumed for South Street, as well as the associated fair value adjustments, are as follows:
	As Recorded by			Fair				As Recorded
	South Street			Value Adjustments				by BNC
Assets	(Dollars in thousands)
Cash and due from banks	$	39,680		$	—			$	39,680
Investment securities available-for-sale	13,000			—				13,000
Federal Home Loan Bank stock, at cost	895			—				895
Loans	188,386			(10,433		)	-1	177,953
Premises and equipment	9,273			(611		)	-2	8,662
Accrued interest receivable	592			—				592
Other real estate owned	12,358			(3,788		)	-3	8,570
Core deposit intangible	—			2,387			-4	2,387
Other assets	13,554			4,878			-5	18,432
Total assets acquired	$	277,738		$	(7,567	)		270,171
Liabilities
Deposits	$	(236,526	)	$	(1,188	)	-6	(237,714		)
Borrowings	(12,300		)	—				(12,300		)
Other liabilities	(7,075		)	—				(7,075		)
Total liabilities assumed	$	(255,901	)	$	(1,188	)		(257,089		)
Net assets acquired								13,082
Total consideration paid								25,763
Goodwill								$	12,681
Explanation of fair value adjustments:
-1	Adjustment for the fair value of the loan portfolio.
-2	Adjustment for the fair value of premises and equipment.
-3	Adjustment for the fair value of other real estate owned.
-4	Adjustment for the fair value of the core deposit intangible.
-5	Adjustment for the deferred tax asset recognized from acquisition.
-6	Adjustment for the fair value of time deposits.
A summary of the consideration paid is as follows:
	(Dollars in thousands)
Common stock issued (1,139,931 shares)	$	19,778
Cash payments to common shareholders	5,985
Total consideration paid	$	25,763
With this acquisition, the Company expanded its presence in the metropolitan Charlotte, North Carolina market through the addition of four branches, an attractive loan portfolio and an experienced in-market team that enhances our ability to grow in that market. Additionally, goodwill was also created by the expected cost savings that will be recognized in future periods through the elimination of redundant operations. None of the goodwill associated with this acquisition is deductible for income tax purposes. All goodwill related to this acquisition was allocated to the banking operations reporting unit.
The Company incurred transaction-related costs of $2.8 million during the three months ended March 31, 2015, which were expensed as incurred as a component of non-interest expense. Transaction-related costs primarily include, but are not limited to, severance costs, professional services, data processing fees, marketing and advertising expenses.
The Company has determined the above noted acquisitions each constitute a business combination as defined by FASB ASC Topic 805: Business Combinations (“ASC Topic 805”), which establishes principles and requirements for how the acquirer of a business recognizes and measures in its financial statements the identifiable assets acquired and the liabilities assumed. The Company has recorded the assets purchased and liabilities assumed at their estimated fair value in accordance with ASC Topic 805.
The estimated fair values are subject to refinement for up to one year after the closing date of the acquisition as additional information regarding closing date fair value becomes available. During this one year period, the causes of any changes in cash flow estimates are considered to determine whether the change results from circumstances that existed at the acquisition date or if the change results from an event that occurred after the date of acquisition.

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 is computed using the weighted average number of common shares and participating securities outstanding during the reporting period. Diluted earnings per common share is the amount of earnings available to each share of common stock during the reporting period adjusted to include the effect of potentially dilutive common shares. Potentially dilutive common shares include incremental shares issued for stock options and restricted stock awards (collectively referred to herein as “Stock Rights”). Potentially dilutive common shares are excluded from the computation of dilutive earnings per share in the periods in which the effect would be anti-dilutive.
	The Company's basic and diluted earnings per share calculations are presented in the following table:
		Three Months Ended March 31,
		2015		2014
		(Dollars in thousands,
		except per share amounts)
	Net income	$	8,758	$	6,484
	Weighted average participating common shares - basic	32,680,824		27,316,809
	Effects of dilutive Stock Rights	73,573		142,799
	Weighted average participating common shares - diluted	32,754,397		27,459,608
	Basic earnings per common share	$	0.27	$	0.24
	Diluted earnings per common share	$	0.27	$	0.24
	For the three months ended March 31, 2015 and 2014, respectively, there were no shares of Stock Rights excluded in computing diluted common shares outstanding.

Investment_Securities

Investment Securities	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	INVESTMENT SECURITIES
	The amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities are presented in the following tables:
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses			Fair Value
	31-Mar-15	(Dollars in thousands)
	Available-for-sale:
	U.S. Government agencies	$	18,347			$	321			$	—		$	18,668
	State and municipals	163,331				11,491				15			174,807
	Corporate debt securities	18,030				96				60			18,066
	Other debt securities	39,478				44				202			39,320
	Equity securities	11,648				167				233			11,582
	Mortgage-backed securities:
	Residential government sponsored	25,462				854				29			26,287
	Other government sponsored	1,738				123				—			1,861
		$	278,034			$	13,096			$	539		$	290,591
	Held-to-maturity:
	State and municipals	$	210,734			$	7,177			$	276		$	217,635
	Corporate debt securities	14,000				70				920			13,150
		$	224,734			$	7,247			$	1,196		$	230,785
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses			Fair Value
	31-Dec-14	(Dollars in thousands)
	Available-for-sale:
	U.S. Government agencies	$	17,636			$	252			$	—		$	17,888
	State and municipals	178,263				10,899				227			188,935
	Corporate debt securities	13,808				4				197			13,615
	Other debt securities	12,764				—				198			12,566
	Equity securities	6,145				85				321			5,909
	Mortgage-backed securities:
	Residential government sponsored	27,450				884				60			28,274
	Other government sponsored	1,972				131				—			2,103
		$	258,038			$	12,255			$	1,003		$	269,290
	Held-to-maturity:
	State and municipals	$	213,092			$	6,266			$	389		$	218,969
	Corporate debt securities	14,000				48				1,020			13,028
	Other debt securities	10,000				—				—			10,000
		$	237,092			$	6,314			$	1,409		$	241,997
	The amortized cost and estimated fair value of investment securities at March 31, 2015, by contractual maturity, are shown below. The expected life of mortgage-backed securities will differ from contractual maturities because borrowers may have the right to call or prepay the underlying mortgage loans with or without call or prepayment penalties. For purposes of the maturity table, mortgage-backed securities have been included in maturity groupings based on the contractual maturity.
		Amortized Cost				Fair Value
		(Dollars in thousands)
	Available-for-sale:
	Due within one year	$	1,648			$	1,650
	Due after one through five years	21,682				22,121
	Due after five through ten years	18,338				18,566
	Due after ten years	224,718				236,672
	Total debt securities	266,386				279,009
	Equity securities	11,648				11,582
		$	278,034			$	290,591
	Held-to-maturity:
	Due after one year through five years	$	20,904			$	20,586
	Due after five through ten years	11,749				11,836
	Due after ten years	192,081				198,363
		$	224,734			$	230,785
	At March 31, 2015 and December 31, 2014, investment securities with an estimated fair value of approximately $250.2 million and $269.2 million, respectively, were pledged to secure public deposits and for other purposes required or permitted by law.
	The following table presents a summary of realized gains and losses from the sale of investment securities:
		Three Months Ended March 31,
		2015				2014
		(Dollars in thousands)
	Proceeds from sales	$	14,535			$	34,158
	Gross realized gains on sales	$	82			$	337
	Gross realized losses on sales	(33		)		(902		)
	Total realized gains (losses), net	$	49			$	(565	)
	During the three months ended March 31, 2014, the Company sold $3.3 million of investment securities classified as held-to-maturity. These securities were state and municipal debt obligations that were downgraded by Moody's as a result of allegations of fraud and multiple pending investigations of the issuer. The Company recorded a realized gain of $0.2 million on this sale. The Company's intent and ability to hold the remaining held-to-maturity securities was not impacted by these sales.
	The following tables detail gross unrealized losses and fair values of investment securities aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position:
		Less Than 12 Months										12 Months or More							Total
		Number of Securities			Fair Value				Unrealized Losses			Number of Securities			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
31-Mar-15	(Dollars in thousands)
Available-for-sale:
State and municipals	2			$	2,369			$	4		1			$	1,067	$	11	$	3,436	$	15
Corporate debt securities	1			4,181				34			1			2,974		26		7,155		60
Other debt securities	6			15,745				43			1			4,614		159		20,359		202
Equity securities	1			5,487				15			1			760		218		6,247		233
Mortgage-backed securities	—			—				—			3			3,745		29		3,745		29
	10			$	27,782			$	96		7			$	13,160	$	443	$	40,942	$	539
Held-to-maturity:
State and municipals	9			$	8,509			$	48		18			$	16,097	$	228	$	24,606	$	276
Corporate debt securities	—			—				—			1			3,080		920		3,080		920
	9			$	8,509			$	48		19			$	19,177	$	1,148	$	27,686	$	1,196
	Less Than 12 Months										12 Months or More							Total
	Number of Securities			Fair Value				Unrealized Losses			Number of Securities			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
31-Dec-14	(Dollars in thousands)
Available-for-sale:
State and municipals	—			$	—			$	—		11			$	24,083	$	227	24,083		$	227
Corporate debt securities	3			10,134				172			1			2,975		25		13,109		197
Other debt securities	—			—				—			1			4,566		198		4,566		198
Equity securities	1			1,850				18			1			676		303		2,526		321
Mortgage-backed securities	1			4,703				11			4			4,476		49		9,179		60
	5			$	16,687			$	201		18			$	36,776	$	802	$	53,463	$	1,003
Held-to-maturity:
State and municipals	2			$	2,148			$	25		36			$	42,297	$	364	$	44,445	$	389
Corporate debt securities	—			—				—			1			2,980		1,020		2,980		1,020
	2			$	2,148			$	25		37			$	45,277	$	1,384	$	47,425	$	1,409
All state and municipal securities in an unrealized loss position were rated as investment grade at March 31, 2015. The Company noted that, of the 30 municipal securities in an unrealized loss position, none of the securities had an unrealized loss of greater than 4% of their carrying value. The corporate debt securities are issued by well-capitalized and sound financial institutions. The other debt securities are rated above Aa2 by Moody’s and, in the aggregate, had an unrealized loss of less than 1% of their carrying value. The gross unrealized losses reported for the mortgage-backed securities relate to investment securities issued by the Federal National Mortgage Association, the Government National Mortgage Association, or Federal Home Loan Mortgage Corporation. The Company does not intend to sell, and it is not more likely than not that the Company will be required to sell, these investment securities before the anticipated recovery of the amortized cost basis. The unrealized losses for the debt securities are caused by changes in market interest rates and not credit concerns related to the respective issuers.
The equity securities held by the Company in an unrealized loss position at March 31, 2015 consist of publicly-traded common stock of an investment company, as well as preferred stock of a well-capitalized and sound financial institution. The Company concluded there are no concerns about the long-term viability of the issuers. The Company has the positive intent and ability to hold these securities until the anticipated recovery of value occurs.
Based on this analysis, the Company does not consider any investment securities to be other-than-temporarily impaired at March 31, 2015.

Loans_and_Allowance_for_Loan_L

Loans and Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Loans and Allowance for Loan Losses	Major categories of loans are presented below:
		31-Mar-15												31-Dec-14
		Originated				Acquired (1)				Total				Originated				Acquired (1)				Total
		(Dollars in thousands)
	Commercial real estate	$	1,327,759			$	385,232			$	1,712,991			$	1,181,492			$	403,672			$	1,585,164
	Commercial construction	236,957				44,146				281,103				265,968				48,668				314,636
	Commercial and industrial	163,695				35,271				198,966				154,132				38,200				192,332
	Leases	21,489				—				21,489				21,100				—				21,100
	Total commercial	1,749,900				464,649				2,214,549				1,622,692				490,540				2,113,232
	Residential construction	49,614				28,406				78,020				43,298				29,854				73,152
	Residential mortgage	451,968				415,067				867,035				439,600				432,818				872,418
	Consumer and other	11,119				5,114				16,233				10,851				5,445				16,296
	Total portfolio loans	$	2,262,601			$	913,236			$	3,175,837			$	2,116,441			$	958,657			$	3,075,098
	-1	Amount includes $129.9 million and $137.5 million of acquired loans covered under FDIC loss-share agreements at March 31, 2015 and December 31, 2014, respectively. The unpaid principal balance for acquired loans covered under FDIC loss-share agreements was $132.1 million and $140.4 million at March 31, 2015 and December 31, 2014, respectively.
	A portion of the fair value discount on acquired covered loans has an accretable yield associated with those loans that is accreted into interest income over the estimated remaining life of the loans. The remaining non-accretable difference represents cash flows not expected to be collected. The following table details changes in the carrying amount of covered acquired loans and accretable yield for loans receivable for the three months ended March 31, 2015 and the year ended December 31, 2014:
		2015								2014
		Accretable Yield				Carrying Value				Accretable Yield				Carrying Value
		(Dollars in thousands)
	Balance at beginning of period	$	(2,213	)		$	137,459			$	(6,058	)		$	187,661
	Reductions from payments and foreclosures, net	—				(8,217		)		—				(54,489		)
	Reclass from non-accretable to accretable yield	(14		)		14				(221		)		221
	Accretion	599				599				4,066				4,066
	Balance at end of period	$	(1,628	)		$	129,855			$	(2,213	)		$	137,459
	The Company evaluates loans acquired with evidence of credit deterioration in accordance with the provisions of ASC Topic 310-30: Loans and Debt Securities Acquired with Deteriorated Credit Quality ("ASC 310-30"). Credit-impaired loans are those loans showing evidence of credit deterioration since origination and it is probable, at the date of acquisition, the Company will not collect all contractually required principal and interest payments. Generally, the acquired loans that meet the Company’s definition for substandard status fall within the definition of credit-impaired covered loans.
	The Company has the ability to borrow funds from the Federal Home Loan Bank (“FHLB”) and from the Federal Reserve Bank. At March 31, 2015 and December 31 2014, real estate loans with carrying values of $1.17 billion and $1.10 billion, respectively, were pledged to secure borrowing facilities from these institutions.
	A summary of the changes to the allowance for loan losses, by class of financing receivable, is presented below:
	For the three months ended March 31, 2015		Commercial real estate				Commercial construction				Commercial and industrial				Leases				Residential construction				Residential Mortgage				Consumer and other			Total
			(Dollars in thousands)
	Allowance for loan losses:
	Balance December 31, 2014		$	12,685			$	4,311			$	3,226			$	103			$	570			$	9,313			$	191		$	30,399
	Charge-offs		(1,546		)		(6		)		(85		)		—				—				(288		)		(56		)	(1,981		)
	Recoveries		177				774				213				—				30				192				11			1,397
	Provision (1)		1,573				(1,314		)		(206		)		(18		)		(192		)		195				72			110
	Change in FDIC indemnification asset (1)		(87		)		(388		)		(32		)		—				3				(67		)		(3		)	(574		)
	Balance March 31, 2015		$	12,802			$	3,377			$	3,116			$	85			$	411			$	9,345			$	215		$	29,351
	For the three months ended March 31, 2014		Commercial real estate				Commercial construction				Commercial and industrial				Leases				Residential construction				Residential Mortgage				Consumer and other			Total
			(Dollars in thousands)
	Allowance for loan losses:
	Balance December 31, 2013		$	14,752			$	6,738			$	3,137			$	56			$	213			$	7,730			$	249		$	32,875
	Charge-offs		(1,586		)		(1,580		)		(1,254		)		—				—				(1,064		)		(92		)	(5,576		)
	Recoveries		138				549				113				—				10				142				9			961
	Provision (2)		67				199				1,200				18				27				949				101			2,561
	Change in FDIC indemnification asset (2)		147				(239		)		64				—				(6		)		61				32			59
	Balance March 31, 2014		$	13,518			$	5,667			$	3,260			$	74			$	244			$	7,818			$	299		$	30,880
	-1	The provision for loan losses includes the "net" provision on covered loans after coverage provided by FDIC loss-share agreements, which totaled $(0.7) million for the three months ended March 31, 2015. This resulted in a decrease in the FDIC indemnification asset of $0.6 million , which is the difference between the net provision on covered loans and the total reduction to the allowance for loan losses allocable to the covered loan portfolio of $0.1 million for the three months ended March 31, 2015.
	-2	The provision for loan losses includes the "net" provision on covered loans after coverage provided by FDIC loss-share agreements, which totaled $0 for the three months ended March 31, 2014. This resulted in an increase in the FDIC indemnification asset of $0.1 million, which is the difference between the net provision on covered loans and the total additions to the allowance for loan losses allocable to the covered loan portfolio of $0.1 million for the three months ended March 31, 2014.
	The following table provides a breakdown of the recorded investment in loans and the allowance for loan losses based on the method of determining the allowance:
			Commercial real estate				Commercial construction				Commercial and industrial				Leases				Residential construction				Residential Mortgage				Consumer and other			Total
			(Dollars in thousands)
	Balances at March 31, 2015:
	Specific reserves:
	Impaired loans		$	2,112			$	159			$	479			$	—			$	58			$	1,932			$	9		$	4,749
	Purchase credit impaired loans		1,620				226				147				—				3				1,359				9			3,364
	Total specific reserves		3,732				385				626				—				61				3,291				18			8,113
	General reserves		9,070				2,992				2,490				85				350				6,054				197			21,238
	Total		$	12,802			$	3,377			$	3,116			$	85			$	411			$	9,345			$	215		$	29,351
	Loans:
	Individually evaluated for impairment		$	33,027			$	4,058			$	1,751			$	—			$	512			$	17,357			$	92		$	56,797
	Purchase credit impaired loans		78,558				10,974				4,380				—				571				47,742				851			143,076
	Loans collectively evaluated for impairment		1,601,406				266,071				192,835				21,489				76,937				801,936				15,290			2,975,964
	Total		$	1,712,991			$	281,103			$	198,966			$	21,489			$	78,020			$	867,035			$	16,233		$	3,175,837
	Balances at December 31, 2014:
	Specific reserves:
	Impaired loans		$	1,614			$	118			$	42			$	—			$	230			$	972			$	13		$	2,989
Purchase credit impaired loans		1,727				424				152				—				—				1,556				11			3,870
Total specific reserves		3,341				542				194				—				230				2,528				24			6,859
General reserves		9,344				3,769				3,032				103				340				6,785				167			23,540
Total		$	12,685			$	4,311			$	3,226			$	103			$	570			$	9,313			$	191		$	30,399
Loans:
Individually evaluated for impairment		$	27,578			$	4,080			$	1,264			$	—			$	657			$	13,019			$	126		$	46,724
Purchase credit impaired loans		82,477				11,326				4,591				—				952				50,164				872			150,382
Loans collectively evaluated for impairment		1,475,109				299,230				186,477				21,100				71,543				809,235				15,298			2,877,992
Total		$	1,585,164			$	314,636			$	192,332			$	21,100			$	73,152			$	872,418			$	16,296		$	3,075,098
The following tables present information related to impaired loans, excluding purchased impaired loans:
	Impaired Loans - With Allowance												Impaired Loans - With No Allowance
	Recorded Investment				Unpaid Principal Balance				Allowances for Loan Losses Allocated				Recorded Investment				Unpaid Principal Balance
31-Mar-15	(Dollars in thousands)
Originated:
Commercial real estate	$	13,223			$	13,188			$	2,068			$	19,435			$	19,416
Commercial construction	1,599				1,595				134				2,269				2,262
Commercial and industrial	1,297				1,287				453				264				267
Residential construction	348				347				43				—				—
Residential mortgage	7,764				7,739				1,120				4,645				4,632
Consumer and other	93				92				9				—				—
Total originated	24,324				24,248				3,827				26,613				26,577
Acquired:
Commercial real estate	424				424				43				628				645
Commercial construction	203				201				25				264				264
Commercial and industrial	198				197				27				—				27
Residential construction	165				165				15				—				—
Residential mortgage	4,024				4,395				812				4,111				4,244
Total acquired	5,014				5,382				922				5,003				5,180
Total loans	$	29,338			$	29,630			$	4,749			$	31,616			$	31,757
	Impaired Loans - With Allowance												Impaired Loans - With No Allowance
	Recorded Investment				Unpaid Principal Balance				Allowances for Loan Losses Allocated				Recorded Investment				Unpaid Principal Balance
31-Dec-14	(Dollars in thousands)
Originated:
Commercial real estate	$	10,110			$	10,089			$	1,571			$	17,095			$	17,071
Commercial construction	1,734				1,728				105				2,227				2,218
Commercial and industrial	798				790				26				268				271
Residential construction	350				349				44				—				—
Residential mortgage	6,278				6,260				694				5,057				5,045
Consumer and other	127				126				13				—				—
Total originated	19,397				19,342				2,453				24,647				24,605
Acquired:
Commercial real estate	429				428				43				796				824
Commercial construction	133				132				13				469				467
Commercial and industrial	204				203				16				1				28
Residential construction	308				308				185				114				114
Residential mortgage	1,574				1,614				279				7,266				7,744
Total acquired	2,648				2,685				536				8,646				9,177
Total loans	$	22,045			$	22,027			$	2,989			$	33,293			$	33,782
The following table presents information related to the average recorded investment and interest income recognized on impaired loans, excluding purchased impaired loans:
	Three Months Ended March 31,
	2015								2014
	Average Recorded Investment				Interest Income Recognized				Average Recorded Investment				Interest Income Recognized
	(Dollars in thousands)
Impaired loans with allowance:
Commercial real estate	$	12,565			$	81			$	21,276			$	205
Commercial construction	1,774				18				4,144				37
Commercial and industrial	1,433				12				1,545				10
Residential construction	404				3				365				3
Residential mortgage	9,722				15				7,601				44
Consumer and other	104				1				107				—
Total impaired loans with allowance	$	26,002			$	130			$	35,038			$	299
Impaired loans with no allowance:
Commercial real estate	$	19,308			$	98			$	12,966			$	38
Commercial construction	2,589				15				7,126				37
Commercial and industrial	262				—				326				—
Residential construction	114				—				—				—
Residential mortgage	10,647				46				11,266				45
Consumer and other	—				—				56				—
Total impaired loans with no allowance	$	32,920			$	159			$	31,740			$	120
For the three months ended March 31, 2015 and 2014, the amount of interest income recognized within the period that the loans were impaired was primarily related to loans modified in a troubled debt restructuring (“TDR”) that remained on accrual status. The amount of interest income recognized using a cash-basis method of accounting during the period that the loans were impaired was not material.
At March 31, 2015 and December 31, 2014, the Company had $1.2 million and $2.5 million, respectively, of consumer mortgage loans secured by residential real estate properties for which foreclosure proceedings were in progress.
The following tables present an aging analysis of the recorded investment in the Company's loans:
	30-59 Days Past Due				60-89 Days Past Due				Greater than 90 Days Past Due				Non-Accrual				Total Past Due				Current				Total Loans
31-Mar-15	(Dollars in thousands)
Originated:
Commercial real estate	$	880			$	—			$	—			$	8,673			$	9,553			$	1,318,206			$	1,327,759
Commercial construction	11				102				—				1,009				1,122				235,835				236,957
Commercial and industrial	131				24				—				502				657				163,038				163,695
Leases	—				—				—				—				—				21,489				21,489
Residential construction	—				—				—				—				—				49,614				49,614
Residential mortgage	1,667				185				—				4,592				6,444				445,524				451,968
Consumer and other	16				81				—				—				97				11,022				11,119
Total originated	2,705				392				—				14,776				17,873				2,244,728				2,262,601
Acquired:
Commercial real estate	814				119				—				3,551				4,484				380,748				385,232
Commercial construction	161				90				—				559				810				43,336				44,146
Commercial and industrial	116				—				—				197				313				34,958				35,271
Residential construction	419				—				—				165				584				27,822				28,406
Residential mortgage	2,060				669				—				8,668				11,397				403,670				415,067
Consumer and other	37				26				—				51				114				5,000				5,114
Total acquired	3,607				904				—				13,191				17,702				895,534				913,236
Total loans	$	6,312			$	1,296			$	—			$	27,967			$	35,575			$	3,140,262			$	3,175,837
	30-59 Days Past Due				60-89 Days Past Due				Greater than 90 Days Past Due				Non-Accrual				Total Past Due				Current				Total Loans
31-Dec-14	(Dollars in thousands)
Originated:
Commercial real estate	$	1,974			$	—			$	—			$	3,476			$	5,450			$	1,176,042			$	1,181,492
Commercial construction	12				—				—				1,084				1,096				264,872				265,968
Commercial and industrial	102				24				—				417				543				153,589				154,132
Leases	—				—				—				—				—				21,100				21,100
Residential construction	200				—				—				—				200				43,098				43,298
Residential mortgage	1,508				1,268				—				3,498				6,274				433,326				439,600
Consumer and other	6				—				—				—				6				10,845				10,851
Total originated	3,802				1,292				—				8,475				13,569				2,102,872				2,116,441
Acquired:
Commercial real estate	880				155				—				4,508				5,543				398,129				403,672
Commercial construction	230				67				—				779				1,076				47,592				48,668
Commercial and industrial	121				27				—				197				345				37,855				38,200
Residential construction	—				—				—				422				422				29,432				29,854
Residential mortgage	2,200				848				—				10,312				13,360				419,458				432,818
Consumer and other	92				2				—				30				124				5,321				5,445
Total acquired	3,523				1,099				—				16,248				20,870				937,787				958,657
Total loans	$	7,325			$	2,391			$	—			$	24,723			$	34,439			$	3,040,659			$	3,075,098
Credit Quality Indicators
The Company uses several credit quality indicators to manage credit risk in an ongoing manner. The Company's primary credit quality indicators use an internal credit risk rating system that categorizes loans and leases into pass, special mention, or classified categories. Credit risk ratings are applied individually to those classes of loans and leases that have significant or unique credit characteristics that benefit from a case-by-case evaluation. These are typically loans and leases to businesses or individuals in the classes which comprise the commercial portfolio segment. Groups of loans and leases that are underwritten and structured using standardized criteria and characteristics are typically risk rated and monitored collectively. These are typically loans and leases to individuals in the classes which comprise the consumer portfolio segment.
The Company uses the following definitions for risk ratings:
Pass - Loans classified as pass are considered to be a satisfactory credit risk and generally considered to be collectible in full.
Special Mention - Loans classified as special mention have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date.
Substandard - Loans classified as substandard are inadequately protected by the current net worth and payment capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the institution will sustain some loss if the deficiencies are not corrected.
Doubtful - Loans classified as doubtful have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable.
Loss - Loans classified as loss are considered uncollectable and are in the process of being charged-off, as soon as practical, once so classified.
The following tables present the recorded investment in the Company’s loans by credit quality indicator:
		Pass				Special Mention				Substandard				Doubtful				Loss				Total
31-Mar-15		(Dollars in thousands)
Originated:
Commercial real estate		$	1,248,008			$	41,450			$	38,301			$	—			$	—			$	1,327,759
Commercial construction		227,477				6,128				3,352				—				—				236,957
Commercial and industrial		155,177				3,854				4,664				—				—				163,695
Leases		21,489				—				—				—				—				21,489
Residential construction		49,267				—				347				—				—				49,614
Residential mortgage		419,218				20,217				12,533				—				—				451,968
Consumer and other		10,640				387				92				—				—				11,119
Total originated		2,131,276				72,036				59,289				—				—				2,262,601
Acquired:
Commercial real estate		324,353				34,310				26,485				84				—				385,232
Commercial construction		31,345				6,475				6,326				—				—				44,146
Commercial and industrial		33,179				788				1,284				20				—				35,271
Residential construction		27,176				394				836				—				—				28,406
Residential mortgage		355,221				36,846				22,499				501				—				415,067
Consumer and other		4,937				126				51				—				—				5,114
Total acquired		776,211				78,939				57,481				605				—				913,236
Total loans		$	2,907,487			$	150,975			$	116,770			$	605			$	—			$	3,175,837
		Pass				Special Mention				Substandard				Doubtful				Loss				Total
31-Dec-14		(Dollars in thousands)
Originated:
Commercial real estate		$	1,100,361			$	46,935			$	34,196			$	—			$	—			$	1,181,492
Commercial construction		256,987				5,530				3,451				—				—				265,968
Commercial and industrial		145,722				3,980				4,430				—				—				154,132
Leases		21,100				—				—				—				—				21,100
Residential construction		42,806				143				349				—				—				43,298
Residential mortgage		407,319				20,946				11,335				—				—				439,600
Consumer and other		10,331				428				92				—				—				10,851
Total originated		1,984,626				77,962				53,853				—				—				2,116,441
Acquired:
Commercial real estate		342,240				35,816				25,531				85				—				403,672
Commercial construction		36,346				5,910				6,320				92				—				48,668
Commercial and industrial		36,039				644				1,482				35				—				38,200
Residential construction		28,833				—				1,021				—				—				29,854
Residential mortgage		370,523				36,098				24,616				1,581				—				432,818
Consumer and other		5,256				159				30				—				—				5,445
Total acquired		819,237				78,627				59,000				1,793				—				958,657
Total loans		$	2,803,863			$	156,589			$	112,853			$	1,793			$	—			$	3,075,098
Modifications
A modification of a loan constitutes a TDR when a borrower is experiencing financial difficulty and the modification constitutes a concession.  The Company offers various types of concessions when modifying a loan; however, forgiveness of principal is rarely granted.  Commercial and industrial loans modified in a TDR often involve temporary or extended interest-only payments and term extensions outside of normal underwriting guidelines.  Additional collateral, a co-borrower, or a guarantor is often requested.  Commercial mortgage and construction loans modified in a TDR often involve reducing the interest rate for the remaining term of the loan, extending the maturity date at an interest rate lower than the current market rate for new debt with similar risk, or substituting or adding a new borrower or guarantor.  Construction loans modified in a TDR may also involve extending the interest-only payment period.  Residential mortgage loans modified in a TDR are primarily comprised of loans where monthly payments are lowered to accommodate the borrowers’ financial needs for a period of time.  After the lowered monthly payment period ends, the borrower reverts back to paying principal and interest per the original terms with the maturity date adjusted accordingly.  Land loans are also included in the class of residential mortgage loans.  Land loans are typically structured as interest-only monthly payments with a balloon payment due at maturity.  Land loans modified in a TDR typically involve extending the balloon payment by one to three years, or changing the monthly payments from interest-only to principal and interest.  Home equity modifications are made infrequently and are not offered if the Company also holds the first mortgage.  Home equity modifications are uniquely designed to meet the specific needs of each borrower.  Occasionally, the terms will be modified to a standalone second lien mortgage, thereby changing their loan class from home equity to residential mortgage.
Loans modified in a TDR are, in many cases, already on nonaccrual status and partial charge-offs have in some cases already been taken against the outstanding loan balance.  As a result, loans modified in a TDR for the Company may have the financial effect of increasing the specific allowance associated with the loan.  An allowance for impaired consumer and commercial loans that have been modified in a TDR is measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s observable market price, or the estimated fair value of the collateral, less any selling costs, if the loan is collateral dependent.  Management exercises significant judgment in developing these estimates. Once we classify a loan a TDR, the loan is only removed from TDR classification under three circumstances: (1) the loan is paid off, (2) the loan is charged off or (3) if, at the beginning of the current fiscal year, the loan has performed in accordance with the modified terms for a minimum of six consecutive months and at the time of modification the loan’s interest rate represented a then current market interest rate for a loan of similar risk.
The following tables provide a summary of loans modified as TDRs:
	Accrual				Nonaccrual				Total TDRs				Allowance for Loan Losses Allocated
31-Mar-15	(Dollars in thousands)
Commercial real estate	$	5,077			$	—			$	5,077			$	243
Commercial construction	1,339				50				1,389				14
Commercial and industrial	1,063				—				1,063				398
Residential mortgage	7,596				15				7,611				744
Consumer and other	92				—				92				10
Total modifications	$	15,167			$	65			$	15,232			$	1,409
Number of contracts	35				2				37
	Accrual				Nonaccrual				Total TDRs				Allowance for Loan Losses Allocated
31-Dec-14	(Dollars in thousands)
Commercial real estate	$	3,835			$	—			$	3,835			$	165
Commercial construction	1,341				50				1,391				16
Commercial and industrial	651				—				651				25
Residential mortgage	7,625				16				7,641				592
Consumer and other	126				—				126				13
Total modifications	$	13,578			$	66			$	13,644			$	811
Number of contracts	33				2				35
At March 31, 2015 and December 31, 2014, the Company had no available commitments outstanding on TDRs.
The Company offers a variety of modifications to borrowers. The modification categories offered can generally be described in the following categories:
Rate modification - A modification in which the interest rate is changed.
Term modification - A modification in which the maturity date, timing of payments or frequency of payments is changed.
Interest only modification – A modification in which the loan is converted to interest only payments for a period of time.
Payment modification – A modification in which the principal and interest payment are lowered from the original contractual terms.
Combination modification – Any other type of modification, including the use of multiple categories above.
The following tables present new TDRs by modification category. All balances represent the recorded investment at the end of the period in which the modification was made.
	Three Months Ended March 31, 2015
	Term Modification				Payment Modification				Combination Modification				Total Modifications
	(Dollars in thousands)
Commercial real estate	$	417			$	—			$	863			$	1,280
Commercial and industrial	—				419				—				419
Total modifications	$	417			$	419			$	863			$	1,699
	Three Months Ended March 31, 2014
	Payment Modification				Total Modifications
	(Dollars in thousands)
Commercial real estate	$	1,338			$	1,338
The following tables summarize the period-end balance for loans modified and classified as TDRs in the previous 12 months for which a payment default has occurred. The Company defines payment default as movement of the restructuring to nonaccrual status, foreclosure or charge-off, whichever occurs first.
	Three Months Ended March 31,
	2015				2014
	(Dollars in thousands)
Residential mortgage	$	—			$	110
Consumer and other	34				—
Loans held for sale
The Company originates certain single family, residential first mortgage loans for sale on a presold basis. Loan sale activity is summarized below:
	Three Months Ended March 31,
	2015				2014
	(Dollars in thousands)
Loans held for sale	$	25,505			$	18,895
Proceeds from sales of loans held for sale	89,922				69,412
Mortgage fees	2,499				1,558

FDIC_Indemnification_Asset

FDIC Indemnification Asset	3 Months Ended
	Mar. 31, 2015
FDIC Indemnification Asset [Abstract]
FDIC Indemnification Asset	FDIC INDEMNIFICATION ASSET
	The Company has recorded an indemnification asset related to loss-share agreements entered into with the FDIC wherein the FDIC will reimburse the Company for certain amounts related to certain acquired loans and other real estate owned should the Company experience a loss. Under the loss-sharing arrangements, the FDIC has agreed to absorb 80% of all future losses and workout expenses on these assets which occur prior to the expiration of the loss-sharing agreements. The Company entered into the respective loss-share agreements with the acquisitions of Beach First National Bank (“Beach First”) and Blue Ridge Savings Bank (“Blue Ridge”).
	Each loss-sharing arrangement consists of one single family residential mortgage loan agreement and one commercial and other loans and other real estate owned agreement. The commercial and other loan and other real estate owned loss-share agreements provide for FDIC loss-sharing for five years from April 9, 2010 and October 14, 2011 for the purchases of Beach First and Blue Ridge, respectively, and reimbursement to the FDIC for eight years from these dates. The Company does not anticipate any material loss related to the expiration of the loss-sharing arrangement for Beach First, which will occur in the second quarter of 2015. The single family residential mortgage loan loss-share agreements provide for FDIC loss-sharing and reimbursement for recoveries to the FDIC for ten years from these dates for the purchases, and reimbursement to the FDIC for ten years from these dates.
	The following table presents activity for the FDIC indemnification asset for the three months ended March 31, 2015 and the year ended December 31, 2014:
		2015			2014
		(Dollars in thousands)
	Balance at beginning of period	$	5,097		$	16,886
	Accretion of present value discount, net	92			1,061
	Post-acquisition adjustments	261			(2,920		)
	Receipt of payments from FDIC	(611		)	(9,930		)
	Balance at end of period	$	4,839		$	5,097
	The FDIC indemnification asset is measured separately from the related covered assets and is initially recorded at fair value. The fair value was estimated using projected cash flows related to the loss-share agreements based on the expected reimbursements for losses and the applicable loss-share percentages. Cash flow projections are reviewed and updated prospectively as loss estimates related to both covered loans and covered other real estate owned ("OREO") change.

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	DERIVATIVES
	The Company utilizes derivative financial instruments primarily to hedge its exposure to changes in interest rates. All derivative financial instruments are recorded on the balance sheet at their respective fair values. The Company does not use financial instruments or derivatives for any trading or other speculative purposes.
	The primary focus of the Company’s asset/liability management program is to monitor the sensitivity of the Company’s net portfolio value and net income under varying interest rate scenarios to take steps to control its risks. On a quarterly basis, the Company simulates the net portfolio value and net income expected to be earned over a twelve-month period following the date of simulation. The simulation is based on a projection of market interest rates at varying levels and estimates the impact of such market rates on the levels of interest-earning assets and interest-bearing liabilities during the measurement period. Based upon the outcome of the simulation analysis, the Company considers the use of derivatives as a means of reducing the volatility of net portfolio value and projected net income within certain ranges of projected changes in interest rates. The Company evaluates the effectiveness of entering into any derivative instrument agreement by measuring the cost of such an agreement in relation to the reduction in net portfolio value and net income volatility within an assumed range of interest rates. The Company also has derivatives that are a result of a service it provides to certain qualifying customers, which includes a matched book of derivative instruments offered to customers in order to minimize their interest rate risk.
	Derivatives Designated as Cash Flow Hedges of Interest Rate Risk
	The Company has variable rate funding which creates exposure to variability in interest payments due to changes in interest rates. The Company entered into an interest rate swap transaction with a notional amount of $125 million, which was designated as a cash flow hedge of the changes in cash flows attributable to changes in one-month LIBOR, the benchmark interest rate being hedged, associated with the interest payments made on the first $125 million of the Company's variable rate money market funding arrangement. The Company receives interest at the one-month LIBOR rate and pays a fixed interest rate under the terms of the swap agreement. The termination date of the swap agreement is March 18, 2019.
	Derivatives Not Designated as Hedges
	The Company utilizes derivative financial instruments, which may include interest rate swaps, caps and/or floors, as part of its ongoing efforts to mitigate its interest rate risk exposure and to help its commercial customers manage their exposure to interest rate fluctuations. To mitigate the interest rate risk associated with these customer contracts, the Company enters into an offsetting derivative contract position. These derivative positions are recorded at fair value on the Company’s consolidated balance sheet and, due to the matched nature of these derivative instruments, changes in fair value do not impact the Company’s earnings. At March 31, 2015 and December 31, 2014, the Company had notional amounts of $35.9 million and $34.7 million, respectively, on interest rate contracts with corporate customers and in offsetting interest rate contracts with another financial institution to mitigate the Company’s rate exposure on its corporate customers’ contracts.
	The following table presents the fair value of the Company’s derivatives:
		31-Mar-15								31-Dec-14
		Notional Amount		Balance Sheet Location		Fair Value				Notional Amount				Balance Sheet Location	Fair Value
		(Dollars in thousands)
	Derivative assets:
	Derivatives not designated as hedging instruments:
	Interest rate swaps	$	35,926	Other assets		$	1,050			$	34,692			Other assets	$	723
	Derivative liabilities:
	Derivatives designated as hedging instruments:
	Interest rate swap	$	125,000	Accrued expenses and other liabilities		$	1,604			$	125,000			Accrued expenses and other liabilities	$	308
	Derivatives not designated as hedging instruments:
	Interest rate swaps	$	35,926	Accrued expenses and other liabilities		$	1,050			$	34,692			Accrued expenses and other liabilities	$	723
	The derivative instruments held by the Company are subject to master netting arrangements which contain a legally enforceable right to offset recognized amounts and settle such amounts on a net basis. The Company has elected to present the financial assets and financial liabilities associated with these arrangements on a gross basis in the Consolidated Balance Sheets. Cash collateral is posted by the counterparty with net liability positions in accordance with contract thresholds.
	Information about financial instruments that are eligible for offset in the consolidated balance sheets is presented in the following table:
												Gross Amounts Not Offset in the
												Consolidated Balance Sheets
		Gross Amount Recognized		Gross Amounts Offset in the				Net Amounts				Financial Instruments			Collateral Held/Pledged		Net
				Consolidated Balance Sheets				Presented in the
								Consolidated Balance Sheets
		(Dollars in thousands)
	31-Mar-15
	Derivative assets	$	1,050	$	—			$	1,050			$	—		$	—	$	1,050
	Derivative liabilities	2,654		—				2,654				—			2,654		—
	Total derivative instruments	$	3,704	$	—			$	3,704			$	—		$	2,654	$	1,050
	31-Dec-14
	Derivative assets	$	723	$	—			$	723			$	—		$	—	$	723
	Derivative liabilities	1,031		—				1,031				—			1,031		—
	Total derivative instruments	$	1,754	$	—			$	1,754			$	—		$	1,031	$	723
	The Company has recorded a net loss of $1.0 million, net of tax, as accumulated other comprehensive income at March 31, 2015 associated with cash flow hedging instruments and expects $1.4 million, net of tax, to be reclassified as an increase to interest expense during the next 12 months. The following table presents the amounts recorded in the Consolidated Statements of Income and Consolidated Statements of Comprehensive Income, respectively, relating to derivative instruments designated as cash flow hedges, net of tax:
		Three Months Ended March 31,
		2015		2014
		(Dollars in thousands)
	Amount of net gains losses recorded in OCI (effective portion)	$	816	$	576
	Amount of net losses reclassified from OCI to earnings (1)	—		286
	(1) Amount recorded in interest expense on demand deposits in the Consolidated Statements of Income.
	The amounts included in accumulated other comprehensive income will be reclassified to interest expense should the hedges no longer be considered effective. No amount of ineffectiveness was included in net income for the three months ended March 31, 2015 and 2014. The Company will continue to assess the effectiveness of the hedges on a quarterly basis.
	Counterparty Credit Risk – By entering into derivative instrument contracts, the Company exposes itself, from time to time, to counterparty credit risk. Counterparty credit risk is the failure of the counterparty to perform under the terms of the derivative contract. When the fair value of a derivative contract is in an asset position, the counterparty has a liability to the Company, which creates credit risk for the Company. The Company attempts to minimize this risk by selecting counterparties with investment grade credit ratings, limiting its exposure to any single counterparty and regularly monitoring its market position with each counterparty.
	Credit-Risk Related Contingent Features – The Company’s derivative instruments contain provisions allowing the financial institution counterparty to terminate the contracts in certain circumstances, such as a default by the Company on its indebtedness or the failure to maintain its regulatory status as a well-capitalized institution. These derivative agreements also contain provisions regarding the posting of collateral by each party. At March 31, 2015, the aggregate fair value of derivative instruments with credit-risk-related contingent features that were in a net liability position was $2.7 million, for which the Company has posted collateral with a fair value of $4.8 million.

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Borrowings	BORROWINGS
	The following table presents the Company’s short-term borrowings:
		31-Mar-15			31-Dec-14
		(Dollars in thousands)
	Repurchase agreements	$	28,654		$	25,834
	Advances from FHLB	18,000			102,100
	Federal funds purchased	15,000			—
	Total short-term borrowings	$	61,654		$	127,934
	Securities sold under agreements to repurchase generally mature within one day from the transaction date and are collateralized by either U.S. Government Agency obligations, government sponsored mortgage-backed securities or securities issued by local governmental municipalities.
	The following table presents the Company’s long-term debt:
		31-Mar-15			31-Dec-14
		(Dollars in thousands)
	FHLB advances	$	52,000		$	52,000
	Subordinated notes	60,000			60,000
	Junior subordinated debentures	23,713			23,713
		135,713			135,713
	Less: FHLB prepayment penalty	1,708			1,899
	Total long-term debt	$	134,005		$	133,814
	The following table details the Company's long-term FHLB advances outstanding:
	Maturity		Interest Rate	31-Mar-15			31-Dec-14
				(Dollars in thousands)
	Jul-16		0.88%	$	2,000		$	2,000
	Aug-16		1.72%	2,000			2,000
	Jan-18		2.15%	15,000			15,000
	Jan-18		2.27%	10,000			10,000
	Jul-18		1.78%	3,000			3,000
	Jan-20		0.47%	10,000			10,000
	Jan-20		0.47%	10,000			10,000
				$	52,000		$	52,000
	The advances from the FHLB have been made against a $582.1 million line of credit secured by real estate loans and investment securities with carrying values of $821.3 million and $7.4 million, respectively, at March 31, 2015.
	The Company has entered into a 364-day revolving credit facility (the “Credit Agreement”) for an aggregate principal amount of up to $15 million at any time outstanding. The Credit Agreement matures on November 13, 2015. There were no borrowings outstanding under the Credit Agreement at March 31, 2015 and December 31, 2014, respectively.
	In addition, the Company has the ability to borrow funds from the Federal Reserve Bank of Richmond utilizing the discount window and the borrower-in-custody of collateral arrangement. At March 31, 2015, commercial loans and investment securities with carrying values of $346.2 million and $2.8 million, respectively, were assigned under these arrangements. At March 31, 2015, the Company had approximately $208.1 million in borrowing capacity available under these arrangements with no outstanding balance due.
	The Company was not aware of any violations of loan covenants at March 31, 2015.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2015
Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income	The following table presents the changes in accumulated other comprehensive income, net of taxes:
			Unrealized Holding Gains (Losses) on Investment Securities Available-For-Sale			Unrealized Holding Gains on Investment Securities Transferred from Available-For-Sale to Held-to-Maturity			Unrealized Holding Gains (Losses) on Cash Flow Hedging Activities			Total Accumulated Other Comprehensive Income
			(Dollars in thousands)
	Balance at December 31, 2014		$	7,089		$	3,289		$	(196	)	$	10,182
	Other comprehensive income (loss) before reclassifications		854			—			(816		)	38
	Reclassifications from accumulated other comprehensive income		(31		)	(102		)	—			(133		)
	Net current period other comprehensive income (loss)		823			(102		)	(816		)	(95		)
	Balance at March 31, 2015		$	7,912		$	3,187		(1,012		)	$	10,087
	Balance at December 31, 2013		$	(1,946	)	$	3,811		$	1,441		$	3,306
	Other comprehensive income (loss) before reclassifications		3,656			—			(576		)	3,080
	Reclassifications from accumulated other comprehensive income		356			(210		)	286			432
	Net current period other comprehensive income (loss)		4,012			(210		)	(290		)	3,512
	Balance at March 31, 2014		$	2,066		$	3,601		$	1,151		$	6,818
	The following table details reclassification adjustments from accumulated other comprehensive income:
			Three Months Ended March 31,
	Component of Accumulated Other Comprehensive Income		2015			2014			Affected Line Item in the Consolidated Statement of Income
			(Dollars in thousands)
	Unrealized holding gains (losses) on investment securities available-for-sale		$	49		$	(565	)	Gain (loss) on sale of investment securities, net
			(18		)	209			Income tax expense
			31			(356		)	Total, net of tax
	Unrealized holding gains on investment securities transferred from available-for-sale to held-to-maturity (1)		161			334			Interest income - investment securities
			(59		)	(124		)	Income tax expense
			102			210			Total, net of tax
	Unrealized holding gains (losses) on cash flow hedging activities		—			(457		)	Interest expense - demand deposits
			—			171			Income tax expense
			—			(286		)	Total, net of tax
	Total reclassifications for the period		$	133		$	(432	)
	-1	The amortization of the unrealized holding gains in accumulated other comprehensive income at the date of transfer partially offsets the amortization of the difference between the par value and fair value of the investment securities at the date of transfer. Both components are amortized as an adjustment of yield.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENT
	ASC Topic 820, Fair Value Measurements and Disclosures, establishes a framework for measuring fair value, establishes a three-level valuation hierarchy for disclosure of fair value measurement and enhances disclosure requirements for fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability at the measurement date. The three levels of valuations are defined as follows:
	Level 1 – Inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets.
	Level 2 – Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument.
	Level 3 – Inputs to the valuation methodology are unobservable and significant to the fair value measurement, and require significant management judgment or estimation using pricing models, discounted cash flow methodologies or similar techniques.
	Fair Value on a Recurring Basis – The Company measures certain assets at fair value on a recurring basis and the following is a general description of the methods used to value such assets.
	Investment securities available-for-sale – The fair value of a portion of our investment in equity securities available-for-sale is determined by observing quoted prices in an active market for identical securities. As such, the Company classifies these securities as Level 1 valuation. The fair value of the remainder of our investment securities available-for-sale are determined by a third-party pricing service. The valuations provided by the third-party pricing service are based on observable market inputs, which include benchmark yields, reported trades, issuer spreads, benchmark securities, bids, offers and reference data obtained from market research publications. The valuation of mortgage-backed securities also includes new issue data, monthly payment information and “To Be Announced” prices. The valuation of state and municipal securities also include the use of material event notices. We review the prices supplied by the independent pricing service, as well as their underlying pricing methodologies, for reasonableness. At least annually, we will validate prices supplied by the independent pricing service by comparing to prices obtained from a second third-party source. The Company classifies these investment securities as Level 2 valuation.
	Derivative assets and liabilities – The values of derivative instruments held or issued by the Company for risk management purposes are traded in over-the-counter markets where quoted market prices are not readily available. For those derivatives, the Company measures fair value using models that use primarily market observable inputs, such as yield curves and option volatilities, and include the value associated with counterparty credit risk. The Company classifies derivative instruments as Level 2 valuation.
	The following tables present information about certain assets and liabilities measured at fair value on a recurring basis:
			Total Measured at Fair Value			Fair Value Measured Using
	Description					Level 1				Level 2			Level 3
			(Dollars in thousands)
	31-Mar-15
	Assets:
	Investment securities available-for-sale:
	U.S. Government agencies		$	18,668		$	—			$	18,668		$	—
	State and municipals		174,807			—				174,807			—
	Corporate debt securities		18,066			—				18,066			—
	Other debt securities		39,320			—				39,320			—
	Equity securities		11,582			760				10,822			—
	Mortgage-backed securities:
	Residential government sponsored		26,287			—				26,287			—
	Other government sponsored		1,861			—				1,861			—
	Total investment securities available-for-sale		290,591			760				289,831			—
	Derivative instruments:
	Interest rate swap - not designated		1,050			—				1,050			—
	Total derivative instruments		1,050			—				1,050			—
	Total assets measured at fair value on a recurring basis		$	291,641		$	760			$	290,881		$	—
	Liabilities:
	Interest rate swap - cash flow hedge		$	1,604		$	—			$	1,604		—
	Interest rate swap - not designated		1,050			—				1,050			—
	Total liabilities measured at fair value on a recurring basis		$	2,654		$	—			$	2,654		$	—
			Total Measured at Fair Value			Fair Value Measured Using
	Description					Level 1				Level 2			Level 3
			(Dollars in thousands)
	31-Dec-14
	Assets:
	Investment securities available-for-sale:
	U.S. Government agencies		$	17,888		$	—			$	17,888		$	—
	State and municipals		188,935			—				188,935			—
	Corporate debt securities		13,615			—				13,615			—
	Other debt securities		12,566			—				12,566			—
	Equity securities		5,909			676				5,233			—
	Mortgage-backed securities:
	Residential government sponsored		28,274			—				28,274			—
	Other government sponsored		2,103			—				2,103			—
	Total investment securities available-for-sale		269,290			676				268,614			—
	Derivative instruments:
	Interest rate swap - not designated		723			—				723			—
	Total derivative instruments		723			—				723			—
	Total assets measured at fair value on a recurring basis		$	270,013		$	676			$	269,337		$	—
	Liabilities:
	Interest rate swap - cash flow hedge		$	308		$	—			$	308		$	—
	Interest rate swap - not designated		723			—				723			—
	Total liabilities measured at fair value on a recurring basis		$	1,031		$	—			$	1,031		$	—
	Fair Value on a Nonrecurring Basis – The Company measures certain assets at fair value on a nonrecurring basis and the following is a general description of the methods used to value such assets.
	Loans held for sale – Loans held for sale are carried at the lower of cost or market value. The fair value of loans held for sale is based on what secondary markets are currently offering for portfolios with similar characteristics. As such, the Company classifies loans subjected to nonrecurring fair value adjustments as Level 2 valuation.
	Impaired loans – The Company considers a loan impaired when it is probable that the Company will be unable to collect all amounts due according to the original contractual terms of the note agreement, including both principal and interest. Management has determined that nonaccrual loans and loans that have had their terms restructured in a troubled debt restructuring meet this impaired loan definition. For individually evaluated impaired loans, the amount of impairment is based upon the present value of expected future cash flows discounted at the loan’s effective interest rate or the estimated fair value of the underlying collateral for collateral-dependent loans, which the Company classifies as a Level 3 valuation.
	Other real estate owned – Other real estate owned is initially recorded at the lower of carrying value or fair value. Fair value is based upon independent market prices, appraised values of the collateral or management’s estimation of the value of the collateral, which the Company classifies as a Level 3 valuation.
	The following tables present information about certain assets and liabilities measured at fair value on a nonrecurring basis:
			Total Measured at Fair Value			Fair Value Measured Using
	Description					Level 1				Level 2			Level 3
			(Dollars in thousands)
	31-Mar-15
Loans held for sale		$	25,505		$	—			$	25,505		$	—
Impaired loans		191,760			—				—			191,760
Other real estate owned		39,427			—				—			39,427
Total assets measured at fair value on a nonrecurring basis		$	256,692		$	—			$	25,505		$	231,187
31-Dec-14
Loans held for sale		$	37,280		$	—			$	37,280		$	—
Impaired loans		190,247			—				—			190,247
Other real estate owned		42,531			—				—			42,531
Total assets measured at fair value on a nonrecurring basis		$	270,058		$	—			$	37,280		$	232,778
The following table presents the valuation and unobservable inputs for Level 3 assets and liabilities measured at fair value on a nonrecurring basis at March 31, 2015:
Description		Fair Value (Dollars in thousands)			Valuation Methodology		Unobservable Inputs		Range of Inputs
Impaired loans		$	191,760		Appraised value		Discount to reflect current market conditions and ultimate collectability		0% - 20%
Other real estate owned		$	39,427		Appraised value		Discount to reflect current market conditions		0% - 20%
Estimated fair values of financial instruments have been estimated by the Company using the provisions of ASC Topic 825, Financial Instruments (“ASC 825”), which requires disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate that value. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques.
Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. In that regard, the derived fair value estimates cannot be substantiated by comparison to independent markets and, in many cases, could not be realized in immediate settlement of the instruments. ASC 825 excludes certain financial instruments and all nonfinancial instruments from its disclosure requirements. Accordingly, the aggregate fair value amounts presented do not represent the underlying value of the Company.
The following tables present the carrying value and estimated fair values of the Company’s financial instruments, including those that are not measured and reported at fair value on a recurring basis or nonrecurring basis:
	Carrying Value			Fair Value				Level 1			Level 2			Level 3
31-Mar-15	(Dollars in thousands)
Financial assets:
Cash and cash equivalents	$	96,238		$	96,238			$	96,238		$	—		$	—
Investment securities available-for-sale	290,591			290,591				760			289,831			—
Investment securities held-to-maturity	224,734			230,785				—			230,785			—
Federal Home Loan Bank stock	6,638			6,638				—			6,638			—
Loans held for sale	25,505			25,505				—			25,505			—
Loans receivable, net	3,146,486			3,173,125				—			2,981,365			191,760
Accrued interest receivable	13,186			13,186				—			13,186			—
FDIC indemnification asset	4,839			4,839				—			—			4,839
Investment in bank-owned life insurance	94,102			94,102				—			94,102			—
Interest rate swap derivative - not designated	1,050			1,050				—			1,050			—
Financial liabilities:
Demand deposits and savings	$	2,229,389		$	2,229,389			$	—		$	2,229,389		$	—
Time deposits	1,323,537			1,340,133				—			1,340,133			—
Short-term borrowings	61,654			61,654				—			61,654			—
Long-term debt	134,005			132,039				—			132,039			—
Accrued interest payable	2,715			2,715				—			2,715			—
Interest rate swap derivative - cash flow hedge	1,604			1,604				—			1,604			—
Interest rate swap derivative - not designated	1,050			1,050				—			1,050			—
	Carrying Value			Fair Value				Level 1			Level 2			Level 3
31-Dec-14	(Dollars in thousands)
Financial assets:
Cash and cash equivalents	$	85,194		$	85,194			$	85,194		$	—		$	—
Investment securities available-for-sale	269,290			269,290				676			268,614			—
Investment securities held-to-maturity	237,092			241,997				—			241,997			—
Federal Home Loan Bank stock	10,562			10,562				—			10,562			—
Loans held for sale	37,280			37,280				—			37,280			—
Loans receivable, net	3,044,699			3,070,477				—			2,880,230			190,247
Accrued interest receivable	14,514			14,514				—			14,514			—
FDIC indemnification asset	5,097			5,097				—			—			5,097
Investment in bank-owned life insurance	93,396			93,396				—			93,396			—
Interest rate swap derivative - not designated	723			723				—			723			—
Financial liabilities:
Demand deposits and savings	$	2,192,723		$	2,192,723			$	—		$	2,192,723		$	—
Time deposits	1,203,674			1,218,869				—			1,218,869			—
Short-term borrowings	127,934			127,934				—			127,934			—
Long-term debt	133,814			131,417				—			131,417			—
Accrued interest payable	2,011			2,011				—			2,011			—
Interest rate swap derivative - cash flow hedge	308			308				—			308			—
Interest rate swap derivative - not designated	723			723				—			723			—
The following methods and assumptions were used to estimate the fair value of financial instruments that have not been previously discussed:
Cash and cash equivalents - The carrying amounts reported in the balance sheets for cash and cash equivalents approximate the fair value of those assets.
Investment securities held-to-maturity - The fair value of our investment securities held-to-maturity are determined by a third-party pricing service. The valuations provided by the third-party pricing service for state and municipal securities are based on observable market inputs, which include benchmark yields, reported trades, issuer spreads, benchmark securities, bids, offers and the use of material event notices.
We review the prices supplied by the independent pricing service, as well as their underlying pricing methodologies, for reasonableness. At least annually, we will validate prices supplied by the independent pricing service by comparing to prices obtained from a second third-party source.
Federal Home Loan Bank stock - The fair value for FHLB stock is its carrying value, since this is the amount for which it could be redeemed. There is no active market for this stock and the Company, in order to be a member of the FHLB, is required to maintain a minimum investment.
Loans receivable, net - The fair values for loans are estimated using discounted cash flow analyses using interest rates currently being offered for loans with similar terms and credit ratings for the same remaining maturities, adjusted for the allowance for loan losses.
FDIC indemnification asset - The fair value for the FDIC indemnification asset is estimated based on discounted future cash flows using current discount rates.
Investment in bank-owned life insurance - The carrying value of life insurance approximates fair value because this investment is carried at cash surrender value, as determined by the insurer.
Accrued interest receivable and accrued interest payable - The carrying amount of accrued interest is assumed to approximate fair value.
Deposits - The fair values disclosed for deposits with no stated maturity (e.g., interest and non-interest checking, passbook savings, and certain types of money market accounts) are, by definition, equal to the amount payable on demand at the reporting date (i.e., their carrying amounts). Fair values for deposits with a stated maturity date (time deposits) are estimated using a discounted cash flow calculation that applies interest rates currently being offered on these accounts to a schedule of aggregated expected monthly maturities on time deposits.
Short-term borrowings - The carrying amount of short-term borrowings is assumed to approximate fair value.
Long-term debt – The fair value is estimated by discounting the future contractual cash flows using current market interest rates for similar debt over the same remaining term.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitment and Contingencies	COMMITMENTS AND CONTINGENCIES
	The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit, unfunded lines of credit, and standby letters of credit. These instruments involve elements of credit risk in excess of amounts recognized in the accompanying consolidated financial statements.
	The Company's risk of loss in the event of nonperformance by the other party to the commitment to extend credit, lines of 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 under such instruments as it does for on-balance sheet instruments. The amount of collateral obtained, if any, is based on management's evaluation of the borrower. Collateral held varies, but may include accounts receivable, inventory, real estate and time deposits with financial institutions. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent cash requirements.
	The following table presents the outstanding off-balance sheet financial instruments whose contract amounts represent potential credit risk:
		31-Mar-15		31-Dec-14
		(Dollars in thousands)
	Commitments under unfunded loans and lines of credit	$	699,641	$	663,137
	Letters of credit	7,519		6,607
	Unused credit card lines	4,361		4,512
	In addition to the above noted credit commitments, the Company has committed to invest up to $8.8 million in limited partnership interests of unconsolidated entities, of which $5.6 million was unfunded at March 31, 2015 and December 31, 2014, respectively.
	The Company is subject in the normal course of business to various pending and threatened legal proceedings in which claims for monetary damages are asserted. Management, after consultation with legal counsel, does not anticipate that the aggregate ultimate liability arising out of litigation pending or threatened against the Company will be material to the Company’s consolidated financial position. On an on-going basis the Company assesses any potential liabilities or contingencies in connection with such legal proceedings. For those matters where it is deemed probable that the Company will incur losses and the amount of the losses can be reasonably estimated, the Company would record an expense and corresponding liability in its consolidated financial statements.

Employee_Benefits

Employee Benefits	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee Benefits	EMPLOYEE BENEFITS
	The Compensation Committee of the Company's Board of Directors may grant or award eligible participants stock options, restricted stock, restricted stock units, stock appreciation rights, and other stock-based awards or any combination of awards (collectively referred to herein as “Rights”). At March 31, 2015, the Company had Rights outstanding from the 2006 BNC Bancorp Omnibus Stock Ownership and Long Term Incentive Plan (the "2006 Omnibus Plan"), the BNC Bancorp 2013 Omnibus Stock Incentive Plan (the "2013 Omnibus Plan") and the KeySource Non-Statutory and Incentive Stock Option plans (the "KeySource Plans"). The 2013 Omnibus Plan and the KeySource Plans are the only plans that are available for future grants. At March 31, 2015, the Company had 173,683 Rights issued under the 2006 Omnibus Plan, 443,981 Rights issued and 972,007 Rights available for grants or awards under the 2013 Omnibus Plan, and 145,660 stock options issued and 35,607 stock options available for issuance related to the KeySource Plans.
	Stock Option Awards. The fair value of each option award is estimated on the date of grant using the Black-Scholes-Merton option pricing model. The risk-free interest rate is based on the U.S. Treasury rate for the expected life at the time of grant. Volatility is based on the average volatility of the Company based upon previous trading history. The expected life and forfeiture assumptions are based on historical data. Dividend yield is based on the yield at the time of the option grant. There were no grants of options during the three months ended March 31, 2015.
	A summary of the Company’s stock option activity for the three months ended March 31, 2015 is presented below:
		Shares		Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
		(Dollars in thousands, except per share amounts)
	Outstanding at December 31, 2014	337,778		$	11.37
	Exercised	156,125		12.22
	Forfeited or expired	—		—
	Outstanding at March 31, 2015	181,653		$	10.63	2.74	$	1,356
	Exercisable at March 31, 2015	180,229		$	10.64	2.72	$	1,344
	Share options expected to vest	1,424		$	9.67	5.03	$	12
	The related compensation expense recognized for stock options was immaterial for the three months ended March 31, 2015 and 2014, respectively. At March 31, 2015, there was an immaterial amount of total unrecognized compensation cost related to non-vested stock options granted under the plans. That cost is expected to be recognized over a weighted average period of 0.11 years.
	Restricted Stock Awards. A summary of the activity of the Company’s unvested restricted stock awards for the three months ended March 31, 2015 is presented below:
		Number of Shares		Weighted Average Grant-Date Fair Value per Share
	Unvested at December 31, 2014	601,268		$	14.9
	Granted	2,000		16.7
	Vested	(17,963	)	16.2
	Forfeited	(3,334	)	10.87
	Unvested at March 31, 2015	581,971		$	14.89
	The Company measures the fair value of restricted shares based on the price of the Company's common stock on the grant date, and compensation expense is recorded over the vesting period. The related compensation expense recognized for restricted stock awards for the three months ended March 31, 2015 and 2014 was $0.7 million and $0.5 million, respectively. At March 31, 2015, there was $7.0 million of total unrecognized compensation cost related to unvested restricted stock granted under the plans. That cost is expected to be recognized over a weighted average period of 2.43 years. The grant-date fair value of restricted stock grants vested during the three months ended March 31, 2015 and 2014 was $0.3 million and $0.2 million, respectively.

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	These consolidated financial statements and notes are presented in accordance with the instructions for Form 10-Q and, therefore, do not include all information and notes necessary for a complete presentation of financial position, results of operations and cash flow activity required in accordance with accounting principles generally accepted in the United States of America (“GAAP”). In the opinion of management, all normal recurring adjustments necessary for a fair statement of the consolidated financial position and consolidated results of operations have been made. The information contained in the consolidated financial statements and footnotes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 should be referred to in connection with these unaudited interim consolidated financial statements.
Reclassifications	Certain amounts in the 2014 consolidated financial statements have been reclassified to conform to 2015 presentation. These reclassifications had no effect on net income, net income or shareholders' equity as previously reported.
Use of Estimates	The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. On an ongoing basis, the Company evaluates its estimates, including those relating to the allowance for loan losses, determination of fair value of acquired assets and assumed liabilities, and valuation of goodwill and intangible assets.
Recently Adopted and Issued Accounting Standards	In April 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2015-03, Simplifying the Presentation of Debt Issuance Costs, which amends the presentation of debt issuance costs in the balance sheet as a direct deduction from the related debt liability. This update affects disclosures related to debt issuance costs but does not affect existing recognition and measurement guidance for these items. ASU 2015-03 is effective for annual and interim periods beginning after December 15, 2015. The Company does not expect the adoption of this ASU to have a material impact on the its consolidated financial statements.
	In February 2015, the FASB issued ASU 2015-02 Consolidation (Topic 810): Amendments to the Consolidation Analysis, which amends the consolidation analysis required under GAAP. The revised guidance amends the consolidation analysis based on certain fee arrangements or relationships to the reporting entity and, for limited partnerships, requires entities to consider the limited partner’s rights relative to the general partner. Although the amendments are expected to result in the deconsolidation of many entities, the Company will need to reevaluate all its previous consolidation conclusions. ASU 2015-02 is effective for annual and interim periods beginning after December 15, 2015, with early adoption permitted (including during an interim period), provided that the guidance is applied as of the beginning of the annual period containing the adoption date. The Company is currently evaluating the impact the adoption of this ASU will have on its consolidated financial statements.
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). This ASU was developed as a joint project with the International Accounting Standards Board to remove inconsistencies in revenue requirements and provide a more robust framework for addressing revenue issues. The ASU’s core principle is that an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. The ASU is effective for public entities for annual and interim periods beginning after December 15, 2016. The ASU may be adopted using either a modified retrospective method or a full retrospective method and early adoption is not permitted. The Company is currently evaluating the impact the adoption of this ASU will have on its consolidated financial statements.
	In January 2014, the FASB issued ASU No. 2014-04, Receivables (Topic 310): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure, to clarify that an in substance repossession or foreclosure occurs upon either the creditor obtaining legal title to the residential real estate property or the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. The amendments are effective for annual periods, and interim reporting periods within those annual periods, beginning after December 15, 2014. The amendments may be adopted using either a modified retrospective transition method or a prospective transition method and early adoption is permitted. The adoption of this ASU did not have a material impact on the Company's consolidated financial statements.

Acquisitions_Tables

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2015
Community First [Member]
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	A summary of assets received and liabilities assumed for Community First, as well as the associated fair value adjustments, are as follows:
		As Recorded by			Fair				As Recorded
		Community First			Value Adjustments				by BNC
	Assets	(Dollars in thousands)
	Cash and due from banks	$	47,330		$	—			$	47,330
	Investment securities available-for-sale	12,000			—				12,000
	Federal Home Loan Bank stock, at cost	293			—				293
	Loans	152,885			(15,139		)	-1	137,746
	Premises and equipment	545			(131		)	-2	414
	Accrued interest receivable	436			—				436
	Other real estate owned	1,419			(271		)	-3	1,148
	Core deposit intangible	—			3,624			-4	3,624
	Other assets	6,849			4,552			-5	11,401
	Total assets acquired	$	221,757		$	(7,365	)		214,392
	Liabilities
	Deposits	$	(191,486	)	$	(180	)	-6	(191,666		)
	Borrowings	(4,560		)	—				(4,560		)
	Other liabilities	(1,063		)	(205		)	-7	(1,268		)
	Total liabilities assumed	$	(197,109	)	$	(385	)		(197,494		)
	Net assets acquired								16,898
	Total consideration paid								26,734
	Goodwill								$	9,836
	Explanation of fair value adjustments:
	-1	Adjustment for the fair value of the loan portfolio.
	-2	Adjustment for the fair value of premises and equipment.
	-3	Adjustment for the fair value of other real estate owned.
	-4	Adjustment for the fair value of the core deposit intangible.
	-5	Adjustment for the deferred tax asset recognized from acquisition.
	-6	Adjustment for the fair value of time deposits.
	-7	Adjustment for the fair value of leases acquired.
	A summary of the consideration paid is as follows:
		(Dollars in thousands)
	Common stock issued (1,190,763 shares)	$	20,128
	Redemption of preferred stock	850
	Cash payments to common shareholders	5,756
	Total consideration paid	$	26,734
Harbor Bank Group, Inc
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	A summary of assets received and liabilities assumed for Harbor, as well as the associated fair value adjustments, are as follows:
		As Recorded by Harbor			Fair				As Recorded
					Value Adjustments				by BNC
	Assets	(Dollars in thousands)
	Cash and due from banks	$	5,833		$	—			$	5,833
	Investment securities available-for-sale	9,200			—				9,200
	Federal Home Loan Bank stock, at cost	1,259			—				1,259
	Loans	293,848			(4,207		)	-1	289,641
	Premises and equipment	1,801			—				1,801
	Accrued interest receivable	643			—				643
	Other real estate owned	11			—				11
	Core deposit intangible	—			3,700			-2	3,700
	Other assets	6,718			381			-3	7,099
	Total assets acquired	$	319,313		$	(126	)		319,187
	Liabilities
	Deposits	$	(254,521	)	$	(253	)	-4	(254,774		)
	Borrowings	(29,720		)	(184		)	-5	(29,904		)
	Other liabilities	(2,268		)	(85		)	-6	(2,353		)
	Total liabilities assumed	$	(286,509	)	$	(522	)		(287,031		)
	Net assets acquired								32,156
	Total consideration paid (3,082,714 shares of voting common stock)								51,003
	Goodwill								$	18,847
	Explanation of fair value adjustments:
	-1	Adjustment for the fair value of the loan portfolio.
	-2	Adjustment for the fair value of the core deposit intangible.
	-3	Adjustment for the deferred tax asset recognized from acquisition.
	-4	Adjustment for the fair value of time deposits.
	-5	Adjustment for the fair value of borrowings assumed.
	-6	Adjustment for the fair value of leases acquired.
South Street Financial Corporation
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	A summary of assets received and liabilities assumed for South Street, as well as the associated fair value adjustments, are as follows:
		As Recorded by			Fair				As Recorded
		South Street			Value Adjustments				by BNC
	Assets	(Dollars in thousands)
	Cash and due from banks	$	39,680		$	—			$	39,680
	Investment securities available-for-sale	13,000			—				13,000
	Federal Home Loan Bank stock, at cost	895			—				895
	Loans	188,386			(10,433		)	-1	177,953
	Premises and equipment	9,273			(611		)	-2	8,662
	Accrued interest receivable	592			—				592
	Other real estate owned	12,358			(3,788		)	-3	8,570
	Core deposit intangible	—			2,387			-4	2,387
	Other assets	13,554			4,878			-5	18,432
	Total assets acquired	$	277,738		$	(7,567	)		270,171
	Liabilities
	Deposits	$	(236,526	)	$	(1,188	)	-6	(237,714		)
	Borrowings	(12,300		)	—				(12,300		)
	Other liabilities	(7,075		)	—				(7,075		)
	Total liabilities assumed	$	(255,901	)	$	(1,188	)		(257,089		)
	Net assets acquired								13,082
	Total consideration paid								25,763
	Goodwill								$	12,681
	Explanation of fair value adjustments:
	-1	Adjustment for the fair value of the loan portfolio.
	-2	Adjustment for the fair value of premises and equipment.
	-3	Adjustment for the fair value of other real estate owned.
	-4	Adjustment for the fair value of the core deposit intangible.
	-5	Adjustment for the deferred tax asset recognized from acquisition.
	-6	Adjustment for the fair value of time deposits.
	A summary of the consideration paid is as follows:
		(Dollars in thousands)
	Common stock issued (1,139,931 shares)	$	19,778
	Cash payments to common shareholders	5,985
	Total consideration paid	$	25,763

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The Company's basic and diluted earnings per share calculations are presented in the following table:
		Three Months Ended March 31,
		2015		2014
		(Dollars in thousands,
		except per share amounts)
	Net income	$	8,758	$	6,484
	Weighted average participating common shares - basic	32,680,824		27,316,809
	Effects of dilutive Stock Rights	73,573		142,799
	Weighted average participating common shares - diluted	32,754,397		27,459,608
	Basic earnings per common share	$	0.27	$	0.24
	Diluted earnings per common share	$	0.27	$	0.24

Investment_Securities_Tables

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	The amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities are presented in the following tables:
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses			Fair Value
	31-Mar-15	(Dollars in thousands)
	Available-for-sale:
	U.S. Government agencies	$	18,347			$	321			$	—		$	18,668
	State and municipals	163,331				11,491				15			174,807
	Corporate debt securities	18,030				96				60			18,066
	Other debt securities	39,478				44				202			39,320
	Equity securities	11,648				167				233			11,582
	Mortgage-backed securities:
	Residential government sponsored	25,462				854				29			26,287
	Other government sponsored	1,738				123				—			1,861
		$	278,034			$	13,096			$	539		$	290,591
	Held-to-maturity:
	State and municipals	$	210,734			$	7,177			$	276		$	217,635
	Corporate debt securities	14,000				70				920			13,150
		$	224,734			$	7,247			$	1,196		$	230,785
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses			Fair Value
	31-Dec-14	(Dollars in thousands)
	Available-for-sale:
	U.S. Government agencies	$	17,636			$	252			$	—		$	17,888
	State and municipals	178,263				10,899				227			188,935
	Corporate debt securities	13,808				4				197			13,615
	Other debt securities	12,764				—				198			12,566
	Equity securities	6,145				85				321			5,909
	Mortgage-backed securities:
	Residential government sponsored	27,450				884				60			28,274
	Other government sponsored	1,972				131				—			2,103
		$	258,038			$	12,255			$	1,003		$	269,290
	Held-to-maturity:
	State and municipals	$	213,092			$	6,266			$	389		$	218,969
	Corporate debt securities	14,000				48				1,020			13,028
	Other debt securities	10,000				—				—			10,000
		$	237,092			$	6,314			$	1,409		$	241,997
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of investment securities at March 31, 2015, by contractual maturity, are shown below. The expected life of mortgage-backed securities will differ from contractual maturities because borrowers may have the right to call or prepay the underlying mortgage loans with or without call or prepayment penalties. For purposes of the maturity table, mortgage-backed securities have been included in maturity groupings based on the contractual maturity.
		Amortized Cost				Fair Value
		(Dollars in thousands)
	Available-for-sale:
	Due within one year	$	1,648			$	1,650
	Due after one through five years	21,682				22,121
	Due after five through ten years	18,338				18,566
	Due after ten years	224,718				236,672
	Total debt securities	266,386				279,009
	Equity securities	11,648				11,582
		$	278,034			$	290,591
	Held-to-maturity:
	Due after one year through five years	$	20,904			$	20,586
	Due after five through ten years	11,749				11,836
	Due after ten years	192,081				198,363
		$	224,734			$	230,785
Schedule of Realized Gain (Loss)	The following table presents a summary of realized gains and losses from the sale of investment securities:
		Three Months Ended March 31,
		2015				2014
		(Dollars in thousands)
	Proceeds from sales	$	14,535			$	34,158
	Gross realized gains on sales	$	82			$	337
	Gross realized losses on sales	(33		)		(902		)
	Total realized gains (losses), net	$	49			$	(565	)
Investments in a Continuous Unrealized Loss Position, Fair Value	The following tables detail gross unrealized losses and fair values of investment securities aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position:
		Less Than 12 Months										12 Months or More							Total
		Number of Securities			Fair Value				Unrealized Losses			Number of Securities			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	31-Mar-15	(Dollars in thousands)
	Available-for-sale:
	State and municipals	2			$	2,369			$	4		1			$	1,067	$	11	$	3,436	$	15
	Corporate debt securities	1			4,181				34			1			2,974		26		7,155		60
	Other debt securities	6			15,745				43			1			4,614		159		20,359		202
	Equity securities	1			5,487				15			1			760		218		6,247		233
	Mortgage-backed securities	—			—				—			3			3,745		29		3,745		29
		10			$	27,782			$	96		7			$	13,160	$	443	$	40,942	$	539
	Held-to-maturity:
	State and municipals	9			$	8,509			$	48		18			$	16,097	$	228	$	24,606	$	276
	Corporate debt securities	—			—				—			1			3,080		920		3,080		920
		9			$	8,509			$	48		19			$	19,177	$	1,148	$	27,686	$	1,196
		Less Than 12 Months										12 Months or More							Total
		Number of Securities			Fair Value				Unrealized Losses			Number of Securities			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	31-Dec-14	(Dollars in thousands)
	Available-for-sale:
	State and municipals	—			$	—			$	—		11			$	24,083	$	227	24,083		$	227
	Corporate debt securities	3			10,134				172			1			2,975		25		13,109		197
	Other debt securities	—			—				—			1			4,566		198		4,566		198
	Equity securities	1			1,850				18			1			676		303		2,526		321
	Mortgage-backed securities	1			4,703				11			4			4,476		49		9,179		60
		5			$	16,687			$	201		18			$	36,776	$	802	$	53,463	$	1,003
	Held-to-maturity:
	State and municipals	2			$	2,148			$	25		36			$	42,297	$	364	$	44,445	$	389
	Corporate debt securities	—			—				—			1			2,980		1,020		2,980		1,020
		2			$	2,148			$	25		37			$	45,277	$	1,384	$	47,425	$	1,409

Loans_and_Allowance_for_Loan_L1

Loans and Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Schedule of Financing Receivables Originated and Acquired	Major categories of loans are presented below:
		31-Mar-15												31-Dec-14
		Originated				Acquired (1)				Total				Originated				Acquired (1)				Total
		(Dollars in thousands)
	Commercial real estate	$	1,327,759			$	385,232			$	1,712,991			$	1,181,492			$	403,672			$	1,585,164
	Commercial construction	236,957				44,146				281,103				265,968				48,668				314,636
	Commercial and industrial	163,695				35,271				198,966				154,132				38,200				192,332
	Leases	21,489				—				21,489				21,100				—				21,100
	Total commercial	1,749,900				464,649				2,214,549				1,622,692				490,540				2,113,232
	Residential construction	49,614				28,406				78,020				43,298				29,854				73,152
	Residential mortgage	451,968				415,067				867,035				439,600				432,818				872,418
	Consumer and other	11,119				5,114				16,233				10,851				5,445				16,296
	Total portfolio loans	$	2,262,601			$	913,236			$	3,175,837			$	2,116,441			$	958,657			$	3,075,098
	-1	Amount includes $129.9 million and $137.5 million of acquired loans covered under FDIC loss-share agreements at March 31, 2015 and December 31, 2014, respectively. The unpaid principal balance for acquired loans covered under FDIC loss-share agreements was $132.1 million and $140.4 million at March 31, 2015 and December 31, 2014, respectively.
Schedule Of Carrying Value Of Purchased Impaired And Nonimpaired Loans	The following table details changes in the carrying amount of covered acquired loans and accretable yield for loans receivable for the three months ended March 31, 2015 and the year ended December 31, 2014:
		2015								2014
		Accretable Yield				Carrying Value				Accretable Yield				Carrying Value
		(Dollars in thousands)
	Balance at beginning of period	$	(2,213	)		$	137,459			$	(6,058	)		$	187,661
	Reductions from payments and foreclosures, net	—				(8,217		)		—				(54,489		)
	Reclass from non-accretable to accretable yield	(14		)		14				(221		)		221
	Accretion	599				599				4,066				4,066
	Balance at end of period	$	(1,628	)		$	129,855			$	(2,213	)		$	137,459
Analysis of Allowance for Loan Losses by Class of Financing Receivable	A summary of the changes to the allowance for loan losses, by class of financing receivable, is presented below:
	For the three months ended March 31, 2015		Commercial real estate				Commercial construction				Commercial and industrial				Leases				Residential construction				Residential Mortgage			Consumer and other			Total
			(Dollars in thousands)
	Allowance for loan losses:
	Balance December 31, 2014		$	12,685			$	4,311			$	3,226			$	103			$	570			$	9,313		$	191		$	30,399
	Charge-offs		(1,546		)		(6		)		(85		)		—				—				(288		)	(56		)	(1,981		)
	Recoveries		177				774				213				—				30				192			11			1,397
	Provision (1)		1,573				(1,314		)		(206		)		(18		)		(192		)		195			72			110
	Change in FDIC indemnification asset (1)		(87		)		(388		)		(32		)		—				3				(67		)	(3		)	(574		)
	Balance March 31, 2015		$	12,802			$	3,377			$	3,116			$	85			$	411			$	9,345		$	215		$	29,351
	For the three months ended March 31, 2014		Commercial real estate				Commercial construction				Commercial and industrial				Leases				Residential construction				Residential Mortgage			Consumer and other			Total
			(Dollars in thousands)
	Allowance for loan losses:
	Balance December 31, 2013		$	14,752			$	6,738			$	3,137			$	56			$	213			$	7,730		$	249		$	32,875
	Charge-offs		(1,586		)		(1,580		)		(1,254		)		—				—				(1,064		)	(92		)	(5,576		)
	Recoveries		138				549				113				—				10				142			9			961
	Provision (2)		67				199				1,200				18				27				949			101			2,561
	Change in FDIC indemnification asset (2)		147				(239		)		64				—				(6		)		61			32			59
	Balance March 31, 2014		$	13,518			$	5,667			$	3,260			$	74			$	244			$	7,818		$	299		$	30,880
	-1	The provision for loan losses includes the "net" provision on covered loans after coverage provided by FDIC loss-share agreements, which totaled $(0.7) million for the three months ended March 31, 2015. This resulted in a decrease in the FDIC indemnification asset of $0.6 million , which is the difference between the net provision on covered loans and the total reduction to the allowance for loan losses allocable to the covered loan portfolio of $0.1 million for the three months ended March 31, 2015.
	-2	The provision for loan losses includes the "net" provision on covered loans after coverage provided by FDIC loss-share agreements, which totaled $0 for the three months ended March 31, 2014. This resulted in an increase in the FDIC indemnification asset of $0.1 million, which is the difference between the net provision on covered loans and the total additions to the allowance for loan losses allocable to the covered loan portfolio of $0.1 million for the three months ended March 31, 2014.
	A summary of the changes to the allowance for loan losses, by class of financing receivable, is presented below:
	For the three months ended March 31, 2015		Commercial real estate				Commercial construction				Commercial and industrial				Leases				Residential construction				Residential Mortgage			Consumer and other			Total
			(Dollars in thousands)
	Allowance for loan losses:
	Balance December 31, 2014		$	12,685			$	4,311			$	3,226			$	103			$	570			$	9,313		$	191		$	30,399
	Charge-offs		(1,546		)		(6		)		(85		)		—				—				(288		)	(56		)	(1,981		)
	Recoveries		177				774				213				—				30				192			11			1,397
	Provision (1)		1,573				(1,314		)		(206		)		(18		)		(192		)		195			72			110
	Change in FDIC indemnification asset (1)		(87		)		(388		)		(32		)		—				3				(67		)	(3		)	(574		)
	Balance March 31, 2015		$	12,802			$	3,377			$	3,116			$	85			$	411			$	9,345		$	215		$	29,351
	For the three months ended March 31, 2014		Commercial real estate				Commercial construction				Commercial and industrial				Leases				Residential construction				Residential Mortgage			Consumer and other			Total
			(Dollars in thousands)
	Allowance for loan losses:
	Balance December 31, 2013		$	14,752			$	6,738			$	3,137			$	56			$	213			$	7,730		$	249		$	32,875
	Charge-offs		(1,586		)		(1,580		)		(1,254		)		—				—				(1,064		)	(92		)	(5,576		)
	Recoveries		138				549				113				—				10				142			9			961
	Provision (2)		67				199				1,200				18				27				949			101			2,561
	Change in FDIC indemnification asset (2)		147				(239		)		64				—				(6		)		61			32			59
	Balance March 31, 2014		$	13,518			$	5,667			$	3,260			$	74			$	244			$	7,818		$	299		$	30,880
	-1	The provision for loan losses includes the "net" provision on covered loans after coverage provided by FDIC loss-share agreements, which totaled $(0.7) million for the three months ended March 31, 2015. This resulted in a decrease in the FDIC indemnification asset of $0.6 million , which is the difference between the net provision on covered loans and the total reduction to the allowance for loan losses allocable to the covered loan portfolio of $0.1 million for the three months ended March 31, 2015.
	-2	The provision for loan losses includes the "net" provision on covered loans after coverage provided by FDIC loss-share agreements, which totaled $0 for the three months ended March 31, 2014. This resulted in an increase in the FDIC indemnification asset of $0.1 million, which is the difference between the net provision on covered loans and the total additions to the allowance for loan losses allocable to the covered loan portfolio of $0.1 million for the three months ended March 31, 2014.
	The following table provides a breakdown of the recorded investment in loans and the allowance for loan losses based on the method of determining the allowance:
			Commercial real estate				Commercial construction				Commercial and industrial				Leases				Residential construction				Residential Mortgage			Consumer and other			Total
			(Dollars in thousands)
	Balances at March 31, 2015:
	Specific reserves:
	Impaired loans		$	2,112			$	159			$	479			$	—			$	58			$	1,932		$	9		$	4,749
	Purchase credit impaired loans		1,620				226				147				—				3				1,359			9			3,364
	Total specific reserves		3,732				385				626				—				61				3,291			18			8,113
	General reserves		9,070				2,992				2,490				85				350				6,054			197			21,238
	Total		$	12,802			$	3,377			$	3,116			$	85			$	411			$	9,345		$	215		$	29,351
	Loans:
	Individually evaluated for impairment		$	33,027			$	4,058			$	1,751			$	—			$	512			$	17,357		$	92		$	56,797
	Purchase credit impaired loans		78,558				10,974				4,380				—				571				47,742			851			143,076
	Loans collectively evaluated for impairment		1,601,406				266,071				192,835				21,489				76,937				801,936			15,290			2,975,964
	Total		$	1,712,991			$	281,103			$	198,966			$	21,489			$	78,020			$	867,035		$	16,233		$	3,175,837
	Balances at December 31, 2014:
	Specific reserves:
	Impaired loans		$	1,614			$	118			$	42			$	—			$	230			$	972		$	13		$	2,989
	Purchase credit impaired loans		1,727				424				152				—				—				1,556			11			3,870
	Total specific reserves		3,341				542				194				—				230				2,528			24			6,859
	General reserves		9,344				3,769				3,032				103				340				6,785			167			23,540
	Total		$	12,685			$	4,311			$	3,226			$	103			$	570			$	9,313		$	191		$	30,399
Loans:
Individually evaluated for impairment		$	27,578			$	4,080			$	1,264			$	—			$	657			$	13,019		$	126		$	46,724
Purchase credit impaired loans		82,477				11,326				4,591				—				952				50,164			872			150,382
Loans collectively evaluated for impairment		1,475,109				299,230				186,477				21,100				71,543				809,235			15,298			2,877,992
Total		$	1,585,164			$	314,636			$	192,332			$	21,100			$	73,152			$	872,418		$	16,296		$	3,075,098
Schedule Of Impaired Loans	The following tables present information related to impaired loans, excluding purchased impaired loans:
		Impaired Loans - With Allowance												Impaired Loans - With No Allowance
		Recorded Investment				Unpaid Principal Balance				Allowances for Loan Losses Allocated				Recorded Investment				Unpaid Principal Balance
	31-Mar-15	(Dollars in thousands)
	Originated:
	Commercial real estate	$	13,223			$	13,188			$	2,068			$	19,435			$	19,416
	Commercial construction	1,599				1,595				134				2,269				2,262
	Commercial and industrial	1,297				1,287				453				264				267
	Residential construction	348				347				43				—				—
	Residential mortgage	7,764				7,739				1,120				4,645				4,632
	Consumer and other	93				92				9				—				—
	Total originated	24,324				24,248				3,827				26,613				26,577
	Acquired:
	Commercial real estate	424				424				43				628				645
	Commercial construction	203				201				25				264				264
	Commercial and industrial	198				197				27				—				27
	Residential construction	165				165				15				—				—
	Residential mortgage	4,024				4,395				812				4,111				4,244
	Total acquired	5,014				5,382				922				5,003				5,180
	Total loans	$	29,338			$	29,630			$	4,749			$	31,616			$	31,757
		Impaired Loans - With Allowance												Impaired Loans - With No Allowance
		Recorded Investment				Unpaid Principal Balance				Allowances for Loan Losses Allocated				Recorded Investment				Unpaid Principal Balance
	31-Dec-14	(Dollars in thousands)
	Originated:
	Commercial real estate	$	10,110			$	10,089			$	1,571			$	17,095			$	17,071
	Commercial construction	1,734				1,728				105				2,227				2,218
	Commercial and industrial	798				790				26				268				271
	Residential construction	350				349				44				—				—
	Residential mortgage	6,278				6,260				694				5,057				5,045
	Consumer and other	127				126				13				—				—
	Total originated	19,397				19,342				2,453				24,647				24,605
	Acquired:
	Commercial real estate	429				428				43				796				824
	Commercial construction	133				132				13				469				467
	Commercial and industrial	204				203				16				1				28
	Residential construction	308				308				185				114				114
	Residential mortgage	1,574				1,614				279				7,266				7,744
	Total acquired	2,648				2,685				536				8,646				9,177
	Total loans	$	22,045			$	22,027			$	2,989			$	33,293			$	33,782
Schedule of Average Recorded Investment and Interest Income Recognized on Impaired Loans	The following table presents information related to the average recorded investment and interest income recognized on impaired loans, excluding purchased impaired loans:
		Three Months Ended March 31,
		2015								2014
		Average Recorded Investment				Interest Income Recognized				Average Recorded Investment				Interest Income Recognized
		(Dollars in thousands)
	Impaired loans with allowance:
	Commercial real estate	$	12,565			$	81			$	21,276			$	205
	Commercial construction	1,774				18				4,144				37
	Commercial and industrial	1,433				12				1,545				10
	Residential construction	404				3				365				3
	Residential mortgage	9,722				15				7,601				44
	Consumer and other	104				1				107				—
	Total impaired loans with allowance	$	26,002			$	130			$	35,038			$	299
	Impaired loans with no allowance:
	Commercial real estate	$	19,308			$	98			$	12,966			$	38
	Commercial construction	2,589				15				7,126				37
	Commercial and industrial	262				—				326				—
	Residential construction	114				—				—				—
	Residential mortgage	10,647				46				11,266				45
	Consumer and other	—				—				56				—
	Total impaired loans with no allowance	$	32,920			$	159			$	31,740			$	120
Aging of Financing Receivables	For the three months ended March 31, 2015 and 2014, the amount of interest income recognized within the period that the loans were impaired wa
Financing Receivable Credit Quality Indicators	The following tables present the recorded investment in the Company’s loans by credit quality indicator:
			Pass				Special Mention				Substandard				Doubtful				Loss				Total
	31-Mar-15		(Dollars in thousands)
	Originated:
	Commercial real estate		$	1,248,008			$	41,450			$	38,301			$	—			$	—			$	1,327,759
	Commercial construction		227,477				6,128				3,352				—				—				236,957
	Commercial and industrial		155,177				3,854				4,664				—				—				163,695
	Leases		21,489				—				—				—				—				21,489
	Residential construction		49,267				—				347				—				—				49,614
	Residential mortgage		419,218				20,217				12,533				—				—				451,968
	Consumer and other		10,640				387				92				—				—				11,119
	Total originated		2,131,276				72,036				59,289				—				—				2,262,601
	Acquired:
	Commercial real estate		324,353				34,310				26,485				84				—				385,232
	Commercial construction		31,345				6,475				6,326				—				—				44,146
	Commercial and industrial		33,179				788				1,284				20				—				35,271
	Residential construction		27,176				394				836				—				—				28,406
	Residential mortgage		355,221				36,846				22,499				501				—				415,067
	Consumer and other		4,937				126				51				—				—				5,114
	Total acquired		776,211				78,939				57,481				605				—				913,236
	Total loans		$	2,907,487			$	150,975			$	116,770			$	605			$	—			$	3,175,837
			Pass				Special Mention				Substandard				Doubtful				Loss				Total
	31-Dec-14		(Dollars in thousands)
	Originated:
	Commercial real estate		$	1,100,361			$	46,935			$	34,196			$	—			$	—			$	1,181,492
	Commercial construction		256,987				5,530				3,451				—				—				265,968
	Commercial and industrial		145,722				3,980				4,430				—				—				154,132
	Leases		21,100				—				—				—				—				21,100
	Residential construction		42,806				143				349				—				—				43,298
	Residential mortgage		407,319				20,946				11,335				—				—				439,600
	Consumer and other		10,331				428				92				—				—				10,851
	Total originated		1,984,626				77,962				53,853				—				—				2,116,441
	Acquired:
	Commercial real estate		342,240				35,816				25,531				85				—				403,672
	Commercial construction		36,346				5,910				6,320				92				—				48,668
	Commercial and industrial		36,039				644				1,482				35				—				38,200
	Residential construction		28,833				—				1,021				—				—				29,854
	Residential mortgage		370,523				36,098				24,616				1,581				—				432,818
	Consumer and other		5,256				159				30				—				—				5,445
	Total acquired		819,237				78,627				59,000				1,793				—				958,657
	Total loans		$	2,803,863			$	156,589			$	112,853			$	1,793			$	—			$	3,075,098
Troubled Debt Restructurings on Financing Receivables	The following tables provide a summary of loans modified as TDRs:
		Accrual				Nonaccrual				Total TDRs				Allowance for Loan Losses Allocated
	31-Mar-15	(Dollars in thousands)
	Commercial real estate	$	5,077			$	—			$	5,077			$	243
	Commercial construction	1,339				50				1,389				14
	Commercial and industrial	1,063				—				1,063				398
	Residential mortgage	7,596				15				7,611				744
	Consumer and other	92				—				92				10
	Total modifications	$	15,167			$	65			$	15,232			$	1,409
	Number of contracts	35				2				37
		Accrual				Nonaccrual				Total TDRs				Allowance for Loan Losses Allocated
	31-Dec-14	(Dollars in thousands)
	Commercial real estate	$	3,835			$	—			$	3,835			$	165
	Commercial construction	1,341				50				1,391				16
	Commercial and industrial	651				—				651				25
	Residential mortgage	7,625				16				7,641				592
	Consumer and other	126				—				126				13
	Total modifications	$	13,578			$	66			$	13,644			$	811
	Number of contracts	33				2				35
New Troubled Debt Restructurings By Modification Category	The following tables present new TDRs by modification category. All balances represent the recorded investment at the end of the period in which the modification was made.
		Three Months Ended March 31, 2015
		Term Modification				Payment Modification				Combination Modification				Total Modifications
		(Dollars in thousands)
	Commercial real estate	$	417			$	—			$	863			$	1,280
	Commercial and industrial	—				419				—				419
	Total modifications	$	417			$	419			$	863			$	1,699
		Three Months Ended March 31, 2014
		Payment Modification				Total Modifications
		(Dollars in thousands)
	Commercial real estate	$	1,338			$	1,338
Loans Modified in Troubled Debt Restructurings During the Previous 12 months Which Experienced a Payment Default	The following tables summarize the period-end balance for loans modified and classified as TDRs in the previous 12 months for which a payment default has occurred. The Company defines payment default as movement of the restructuring to nonaccrual status, foreclosure or charge-off, whichever occurs first.
		Three Months Ended March 31,
		2015				2014
		(Dollars in thousands)
	Residential mortgage	$	—			$	110
	Consumer and other	34				—
Loan Sale Activity On Single Family Residential First Mortgage Loans Originated For Sale On A Presold Basis	Loan sale activity is summarized below:
		Three Months Ended March 31,
		2015				2014
		(Dollars in thousands)
	Loans held for sale	$	25,505			$	18,895
	Proceeds from sales of loans held for sale	89,922				69,412
	Mortgage fees	2,499				1,558

FDIC_Indemnification_Asset_Tab

FDIC Indemnification Asset (Tables)	3 Months Ended
	Mar. 31, 2015
FDIC Indemnification Asset [Abstract]
FDIC Indemnification Asset Roll Forward	The following table presents activity for the FDIC indemnification asset for the three months ended March 31, 2015 and the year ended December 31, 2014:
		2015			2014
		(Dollars in thousands)
	Balance at beginning of period	$	5,097		$	16,886
	Accretion of present value discount, net	92			1,061
	Post-acquisition adjustments	261			(2,920		)
	Receipt of payments from FDIC	(611		)	(9,930		)
	Balance at end of period	$	4,839		$	5,097

Derivatives_Tables

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Derivatives	The following table presents the fair value of the Company’s derivatives:
		31-Mar-15								31-Dec-14
		Notional Amount		Balance Sheet Location		Fair Value				Notional Amount				Balance Sheet Location	Fair Value
		(Dollars in thousands)
	Derivative assets:
	Derivatives not designated as hedging instruments:
	Interest rate swaps	$	35,926	Other assets		$	1,050			$	34,692			Other assets	$	723
	Derivative liabilities:
	Derivatives designated as hedging instruments:
	Interest rate swap	$	125,000	Accrued expenses and other liabilities		$	1,604			$	125,000			Accrued expenses and other liabilities	$	308
	Derivatives not designated as hedging instruments:
	Interest rate swaps	$	35,926	Accrued expenses and other liabilities		$	1,050			$	34,692			Accrued expenses and other liabilities	$	723
Offsetting Assets And Liabilities	Information about financial instruments that are eligible for offset in the consolidated balance sheets is presented in the following table:
												Gross Amounts Not Offset in the
												Consolidated Balance Sheets
		Gross Amount Recognized		Gross Amounts Offset in the				Net Amounts				Financial Instruments			Collateral Held/Pledged		Net
				Consolidated Balance Sheets				Presented in the
								Consolidated Balance Sheets
		(Dollars in thousands)
	31-Mar-15
	Derivative assets	$	1,050	$	—			$	1,050			$	—		$	—	$	1,050
	Derivative liabilities	2,654		—				2,654				—			2,654		—
	Total derivative instruments	$	3,704	$	—			$	3,704			$	—		$	2,654	$	1,050
	31-Dec-14
	Derivative assets	$	723	$	—			$	723			$	—		$	—	$	723
	Derivative liabilities	1,031		—				1,031				—			1,031		—
	Total derivative instruments	$	1,754	$	—			$	1,754			$	—		$	1,031	$	723
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table presents the amounts recorded in the Consolidated Statements of Income and Consolidated Statements of Comprehensive Income, respectively, relating to derivative instruments designated as cash flow hedges, net of tax:
		Three Months Ended March 31,
		2015		2014
		(Dollars in thousands)
	Amount of net gains losses recorded in OCI (effective portion)	$	816	$	576
	Amount of net losses reclassified from OCI to earnings (1)	—		286
	(1) Amount recorded in interest expense on demand deposits in the Consolidated Statements of Income

Borrowings_Tables

Borrowings (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Schedule of Short Term Debt	The following table presents the Company’s short-term borrowings:
		31-Mar-15			31-Dec-14
		(Dollars in thousands)
	Repurchase agreements	$	28,654		$	25,834
	Advances from FHLB	18,000			102,100
	Federal funds purchased	15,000			—
	Total short-term borrowings	$	61,654		$	127,934
Schedule of Long-term Debt Instruments	The following table presents the Company’s long-term debt:
		31-Mar-15			31-Dec-14
		(Dollars in thousands)
	FHLB advances	$	52,000		$	52,000
	Subordinated notes	60,000			60,000
	Junior subordinated debentures	23,713			23,713
		135,713			135,713
	Less: FHLB prepayment penalty	1,708			1,899
	Total long-term debt	$	134,005		$	133,814
Federal Home Loan Bank, Advances	The following table details the Company's long-term FHLB advances outstanding:
	Maturity		Interest Rate	31-Mar-15			31-Dec-14
				(Dollars in thousands)
	Jul-16		0.88%	$	2,000		$	2,000
	Aug-16		1.72%	2,000			2,000
	Jan-18		2.15%	15,000			15,000
	Jan-18		2.27%	10,000			10,000
	Jul-18		1.78%	3,000			3,000
	Jan-20		0.47%	10,000			10,000
	Jan-20		0.47%	10,000			10,000
				$	52,000		$	52,000

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2015
Accumulated Other Comprehensive Income [Abstract]
Schedule of Accumulated Other Comprehensive Income	The following table presents the changes in accumulated other comprehensive income, net of taxes:
			Unrealized Holding Gains (Losses) on Investment Securities Available-For-Sale			Unrealized Holding Gains on Investment Securities Transferred from Available-For-Sale to Held-to-Maturity			Unrealized Holding Gains (Losses) on Cash Flow Hedging Activities			Total Accumulated Other Comprehensive Income
			(Dollars in thousands)
	Balance at December 31, 2014		$	7,089		$	3,289		$	(196	)	$	10,182
	Other comprehensive income (loss) before reclassifications		854			—			(816		)	38
	Reclassifications from accumulated other comprehensive income		(31		)	(102		)	—			(133		)
	Net current period other comprehensive income (loss)		823			(102		)	(816		)	(95		)
	Balance at March 31, 2015		$	7,912		$	3,187		(1,012		)	$	10,087
	Balance at December 31, 2013		$	(1,946	)	$	3,811		$	1,441		$	3,306
	Other comprehensive income (loss) before reclassifications		3,656			—			(576		)	3,080
	Reclassifications from accumulated other comprehensive income		356			(210		)	286			432
	Net current period other comprehensive income (loss)		4,012			(210		)	(290		)	3,512
	Balance at March 31, 2014		$	2,066		$	3,601		$	1,151		$	6,818
Reclassification Out Of Accumulated Other Comprehensive Income	The following table details reclassification adjustments from accumulated other comprehensive income:
			Three Months Ended March 31,
	Component of Accumulated Other Comprehensive Income		2015			2014			Affected Line Item in the Consolidated Statement of Income
			(Dollars in thousands)
	Unrealized holding gains (losses) on investment securities available-for-sale		$	49		$	(565	)	Gain (loss) on sale of investment securities, net
			(18		)	209			Income tax expense
			31			(356		)	Total, net of tax
	Unrealized holding gains on investment securities transferred from available-for-sale to held-to-maturity (1)		161			334			Interest income - investment securities
			(59		)	(124		)	Income tax expense
			102			210			Total, net of tax
	Unrealized holding gains (losses) on cash flow hedging activities		—			(457		)	Interest expense - demand deposits
			—			171			Income tax expense
			—			(286		)	Total, net of tax
	Total reclassifications for the period		$	133		$	(432	)
	-1	The amortization of the unrealized holding gains in accumulated other comprehensive income at the date of transfer partially offsets the amortization of the difference between the par value and fair value of the investment securities at the date of transfer. Both components are amortized as an adjustment of yield.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables present information about certain assets and liabilities measured at fair value on a recurring basis:
			Total Measured at Fair Value			Fair Value Measured Using
	Description					Level 1				Level 2			Level 3
			(Dollars in thousands)
	31-Mar-15
	Assets:
	Investment securities available-for-sale:
	U.S. Government agencies		$	18,668		$	—			$	18,668		$	—
	State and municipals		174,807			—				174,807			—
	Corporate debt securities		18,066			—				18,066			—
	Other debt securities		39,320			—				39,320			—
	Equity securities		11,582			760				10,822			—
	Mortgage-backed securities:
	Residential government sponsored		26,287			—				26,287			—
	Other government sponsored		1,861			—				1,861			—
	Total investment securities available-for-sale		290,591			760				289,831			—
	Derivative instruments:
	Interest rate swap - not designated		1,050			—				1,050			—
	Total derivative instruments		1,050			—				1,050			—
	Total assets measured at fair value on a recurring basis		$	291,641		$	760			$	290,881		$	—
	Liabilities:
	Interest rate swap - cash flow hedge		$	1,604		$	—			$	1,604		—
	Interest rate swap - not designated		1,050			—				1,050			—
	Total liabilities measured at fair value on a recurring basis		$	2,654		$	—			$	2,654		$	—
			Total Measured at Fair Value			Fair Value Measured Using
	Description					Level 1				Level 2			Level 3
			(Dollars in thousands)
	31-Dec-14
	Assets:
	Investment securities available-for-sale:
	U.S. Government agencies		$	17,888		$	—			$	17,888		$	—
	State and municipals		188,935			—				188,935			—
	Corporate debt securities		13,615			—				13,615			—
	Other debt securities		12,566			—				12,566			—
	Equity securities		5,909			676				5,233			—
	Mortgage-backed securities:
	Residential government sponsored		28,274			—				28,274			—
	Other government sponsored		2,103			—				2,103			—
	Total investment securities available-for-sale		269,290			676				268,614			—
	Derivative instruments:
	Interest rate swap - not designated		723			—				723			—
	Total derivative instruments		723			—				723			—
	Total assets measured at fair value on a recurring basis		$	270,013		$	676			$	269,337		$	—
	Liabilities:
	Interest rate swap - cash flow hedge		$	308		$	—			$	308		$	—
	Interest rate swap - not designated		723			—				723			—
	Total liabilities measured at fair value on a recurring basis		$	1,031		$	—			$	1,031		$	—
Fair Value Measurements, Nonrecurring	The following tables present information about certain assets and liabilities measured at fair value on a nonrecurring basis:
			Total Measured at Fair Value			Fair Value Measured Using
	Description					Level 1				Level 2			Level 3
			(Dollars in thousands)
	31-Mar-15
	Loans held for sale		$	25,505		$	—			$	25,505		$	—
	Impaired loans		191,760			—				—			191,760
	Other real estate owned		39,427			—				—			39,427
	Total assets measured at fair value on a nonrecurring basis		$	256,692		$	—			$	25,505		$	231,187
	31-Dec-14
	Loans held for sale		$	37,280		$	—			$	37,280		$	—
	Impaired loans		190,247			—				—			190,247
	Other real estate owned		42,531			—				—			42,531
	Total assets measured at fair value on a nonrecurring basis		$	270,058		$	—			$	37,280		$	232,778
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques	The following table presents the valuation and unobservable inputs for Level 3 assets and liabilities measured at fair value on a nonrecurring basis at March 31, 2015:
	Description		Fair Value (Dollars in thousands)			Valuation Methodology		Unobservable Inputs		Range of Inputs
	Impaired loans		$	191,760		Appraised value		Discount to reflect current market conditions and ultimate collectability		0% - 20%
	Other real estate owned		$	39,427		Appraised value		Discount to reflect current market conditions		0% - 20%
Fair Value, by Balance Sheet Grouping	The following tables present the carrying value and estimated fair values of the Company’s financial instruments, including those that are not measured and reported at fair value on a recurring basis or nonrecurring basis:
		Carrying Value			Fair Value				Level 1			Level 2			Level 3
	31-Mar-15	(Dollars in thousands)
	Financial assets:
	Cash and cash equivalents	$	96,238		$	96,238			$	96,238		$	—		$	—
	Investment securities available-for-sale	290,591			290,591				760			289,831			—
	Investment securities held-to-maturity	224,734			230,785				—			230,785			—
	Federal Home Loan Bank stock	6,638			6,638				—			6,638			—
	Loans held for sale	25,505			25,505				—			25,505			—
	Loans receivable, net	3,146,486			3,173,125				—			2,981,365			191,760
	Accrued interest receivable	13,186			13,186				—			13,186			—
	FDIC indemnification asset	4,839			4,839				—			—			4,839
	Investment in bank-owned life insurance	94,102			94,102				—			94,102			—
	Interest rate swap derivative - not designated	1,050			1,050				—			1,050			—
	Financial liabilities:
	Demand deposits and savings	$	2,229,389		$	2,229,389			$	—		$	2,229,389		$	—
	Time deposits	1,323,537			1,340,133				—			1,340,133			—
	Short-term borrowings	61,654			61,654				—			61,654			—
	Long-term debt	134,005			132,039				—			132,039			—
	Accrued interest payable	2,715			2,715				—			2,715			—
	Interest rate swap derivative - cash flow hedge	1,604			1,604				—			1,604			—
	Interest rate swap derivative - not designated	1,050			1,050				—			1,050			—
		Carrying Value			Fair Value				Level 1			Level 2			Level 3
	31-Dec-14	(Dollars in thousands)
	Financial assets:
	Cash and cash equivalents	$	85,194		$	85,194			$	85,194		$	—		$	—
	Investment securities available-for-sale	269,290			269,290				676			268,614			—
	Investment securities held-to-maturity	237,092			241,997				—			241,997			—
	Federal Home Loan Bank stock	10,562			10,562				—			10,562			—
	Loans held for sale	37,280			37,280				—			37,280			—
	Loans receivable, net	3,044,699			3,070,477				—			2,880,230			190,247
	Accrued interest receivable	14,514			14,514				—			14,514			—
	FDIC indemnification asset	5,097			5,097				—			—			5,097
	Investment in bank-owned life insurance	93,396			93,396				—			93,396			—
	Interest rate swap derivative - not designated	723			723				—			723			—
	Financial liabilities:
	Demand deposits and savings	$	2,192,723		$	2,192,723			$	—		$	2,192,723		$	—
	Time deposits	1,203,674			1,218,869				—			1,218,869			—
	Short-term borrowings	127,934			127,934				—			127,934			—
	Long-term debt	133,814			131,417				—			131,417			—
	Accrued interest payable	2,011			2,011				—			2,011			—
	Interest rate swap derivative - cash flow hedge	308			308				—			308			—
	Interest rate swap derivative - not designated	723			723				—			723			—

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Fair Value Off Balance Sheet Risks	The following table presents the outstanding off-balance sheet financial instruments whose contract amounts represent potential credit risk:
		31-Mar-15		31-Dec-14
		(Dollars in thousands)
	Commitments under unfunded loans and lines of credit	$	699,641	$	663,137
	Letters of credit	7,519		6,607
	Unused credit card lines	4,361		4,512

Employee_Benefits_Tables

Employee Benefits (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award	A summary of the Company’s stock option activity for the three months ended March 31, 2015 is presented below:
		Shares		Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
		(Dollars in thousands, except per share amounts)
	Outstanding at December 31, 2014	337,778		$	11.37
	Exercised	156,125		12.22
	Forfeited or expired	—		—
	Outstanding at March 31, 2015	181,653		$	10.63	2.74	$	1,356
	Exercisable at March 31, 2015	180,229		$	10.64	2.72	$	1,344
	Share options expected to vest	1,424		$	9.67	5.03	$	12
Schedule of Nonvested Restricted Stock Units Activity	A summary of the activity of the Company’s unvested restricted stock awards for the three months ended March 31, 2015 is presented below:
		Number of Shares		Weighted Average Grant-Date Fair Value per Share
	Unvested at December 31, 2014	601,268		$	14.9
	Granted	2,000		16.7
	Vested	(17,963	)	16.2
	Forfeited	(3,334	)	10.87
	Unvested at March 31, 2015	581,971		$	14.89

Acquisitions_Schedule_of_Recog

Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed Harbor Bank Group (Details) (Harbor Bank Group, Inc, USD $)	0 Months Ended
In Thousands, unless otherwise specified	Dec. 02, 2014
As Recorded By Acquiree
Business Acquisition [Line Items]
Cash and due from banks	$5,833
Investment securities available-for-sale	9,200
Federal Home Loan Bank stock, at cost	1,259
Loans	293,848
Premises and equipment	1,801
Accrued interest receivable	643
Other real estate owned	11
Core deposit intangible	0
Other assets	6,718
Total assets acquired	319,313
Deposits	-254,521
Long-term Debt	-29,720
Other Liabilities	-2,268
Total liabilities assumed	-286,509
Measurement Period Adjustments
Business Acquisition [Line Items]
Cash and due from banks	0
Investment securities available-for-sale	0
Federal Home Loan Bank stock, at cost	0
Loans	-4,207
Premises and equipment	0
Accrued interest receivable	0
Other real estate owned	0
Core deposit intangible	3,700
Other assets	381
Total assets acquired	-126
Deposits	-253
Long-term Debt	-184
Other Liabilities	-85
Total liabilities assumed	-522
As Recorded By Acquirer
Business Acquisition [Line Items]
Cash and due from banks	5,833
Investment securities available-for-sale	9,200
Federal Home Loan Bank stock, at cost	1,259
Loans	289,641
Premises and equipment	1,801
Accrued interest receivable	643
Other real estate owned	11
Core deposit intangible	3,700
Other assets	7,099
Total assets acquired	319,187
Deposits	-254,774
Long-term Debt	-29,904
Other Liabilities	-2,353
Total liabilities assumed	-287,031
Net assets acquired	32,156
Total consideration paid	51,003
Goodwill	$18,847

Acquisitions_Schedule_of_Recog1

Acquisitions - Schedule of Recognized Assets Acquired and Liabilities Assumed Community First Financial Group (Details) (Community First Financial Group, Inc, USD $)	0 Months Ended
In Thousands, unless otherwise specified	Jun. 02, 2014
Business Acquisition [Line Items]
Total consideration paid	$26,734
Common stock issued	20,128
Redemption of preferred stock	850
Cash payments to common stockholders	5,756
As Recorded By Acquiree
Business Acquisition [Line Items]
Cash and due from banks	47,330
Investment securities available-for-sale	12,000
Federal Home Loan Bank stock, at cost	293
Loans	152,885
Premises and equipment	545
Accrued interest receivable	436
Other real estate owned	1,419
Core deposit intangible	0
Other assets	6,849
Total assets acquired	221,757
Deposits	-191,486
Borrowings	-4,560
Other liabilities	-1,063
Total liabilities assumed	-197,109
Measurement Period Adjustments
Business Acquisition [Line Items]
Cash and due from banks	0
Investment securities available-for-sale	0
Federal Home Loan Bank stock, at cost	0
Loans	-15,139
Premises and equipment	-131
Accrued interest receivable	0
Other real estate owned	-271
Core deposit intangible	3,624
Other assets	4,552
Total assets acquired	-7,365
Deposits	-180
Borrowings	0
Other liabilities	-205
Total liabilities assumed	-385
As Recorded By Acquirer
Business Acquisition [Line Items]
Cash and due from banks	47,330
Investment securities available-for-sale	12,000
Federal Home Loan Bank stock, at cost	293
Loans	137,746
Premises and equipment	414
Accrued interest receivable	436
Other real estate owned	1,148
Core deposit intangible	3,624
Other assets	11,401
Total assets acquired	214,392
Deposits	-191,666
Borrowings	-4,560
Other liabilities	-1,268
Total liabilities assumed	-197,494
Net assets acquired	16,898
Total consideration paid	26,734
Goodwill	$9,836

Acquisitions_Schedule_of_Recog2

Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed South Street Financial (Details) (South Street Financial Corporation, USD $)	0 Months Ended
In Thousands, unless otherwise specified	Apr. 02, 2014
Business Acquisition [Line Items]
Common stock issued	$19,778
Cash payments to common stockholders	5,985
Total consideration paid	25,763
As Recorded By Acquiree
Business Acquisition [Line Items]
Cash and due from banks	39,680
Investment securities available-for-sale	13,000
Federal Home Loan Bank stock, at cost	895
Loans	188,386
Premises and equipment	9,273
Accrued interest receivable	592
Other real estate owned	12,358
Core deposit intangible	0
Other assets	13,554
Total assets acquired	277,738
Deposits	-236,526
Borrowings	-12,300
Other liabilities	-7,075
Total liabilities assumed	-255,901
Measurement Period Adjustments
Business Acquisition [Line Items]
Cash and due from banks	0
Investment securities available-for-sale	0
Federal Home Loan Bank stock, at cost	0
Loans	-10,433
Premises and equipment	-611
Accrued interest receivable	0
Other real estate owned	-3,788
Core deposit intangible	2,387
Other assets	4,878
Total assets acquired	-7,567
Deposits	-1,188
Borrowings	0
Other liabilities	0
Total liabilities assumed	-1,188
As Recorded By Acquirer
Business Acquisition [Line Items]
Cash and due from banks	39,680
Investment securities available-for-sale	13,000
Federal Home Loan Bank stock, at cost	895
Loans	177,953
Premises and equipment	8,662
Accrued interest receivable	592
Other real estate owned	8,570
Core deposit intangible	2,387
Other assets	18,432
Total assets acquired	270,171
Deposits	-237,714
Borrowings	-12,300
Other liabilities	-7,075
Total liabilities assumed	-257,089
Net assets acquired	13,082
Goodwill	12,681
Total consideration paid	$25,763

Acquisitions_Narrative_Details

Acquisitions - Narrative (Details) (USD $)	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Nov. 17, 2014	Dec. 02, 2014	Jun. 02, 2014	Apr. 02, 2014
Business Acquisition [Line Items]
Acquisition Related Costs	$2,800,000
Valley Financial Corporation
Business Acquisition [Line Items]
Share Price		$20.50
Duration of Volume Weighted Average Stock Price		20 days
Harbor Bank Group, Inc
Business Acquisition [Line Items]
Ratio of Shares Issued Per Share of Acquired Entity			0.95
Goodwill, Expected Tax Deductible Amount			0
Community First Financial Group, Inc
Business Acquisition [Line Items]
Ratio of Shares Issued Per Share of Acquired Entity				0.4069
Goodwill, Expected Tax Deductible Amount				0
Per Share of Acquired Entity				$5.90
Shareholders of Acquired Entity Electing Stock Conversion Option				75.00%
Shareholders of Acquired Entity Electing Cash Payment Option				25.00%
South Street Financial Corporation
Business Acquisition [Line Items]
Ratio of Shares Issued Per Share of Acquired Entity					0.6
Goodwill, Expected Tax Deductible Amount					$0
Per Share of Acquired Entity					$8.85
Shareholders of Acquired Entity Electing Stock Conversion Option					80.00%
Shareholders of Acquired Entity Electing Cash Payment Option					20.00%
Common stock | Harbor Bank Group, Inc
Business Acquisition [Line Items]
Stock Issued For Acquisitions			3,082,714
Common stock | Community First Financial Group, Inc
Business Acquisition [Line Items]
Stock Issued For Acquisitions				1,190,763
Common stock | South Street Financial Corporation
Business Acquisition [Line Items]
Stock Issued For Acquisitions					1,139,931

Earnings_Per_Share_Schedule_of

Earnings Per Share - Schedule of Earnings Per Share Basic and Diluted (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net income	$8,758	$6,484
Weighted Average Participating Common Shares - Basic	32,680,824	27,316,809
Effects of Dilutive Stock Rights	73,573	142,799
Weighted Average Participating Common Shares - Diluted	32,754,397	27,459,608
Basic (USD per share)	$0.27	$0.24
Diluted (USD per share)	$0.27	$0.24
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0

Investment_Securities_Marketab

Investment Securities - Marketable Securities (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$278,034	$258,038
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	13,096	12,255
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	539	1,003
Investment securities available-for-sale, at fair value	290,591	269,290
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	224,734	237,092
Held To Maturity Securities, Accumulated Unrecognized Holding Gain	7,247	6,314
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	1,196	1,409
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	230,785	241,997
State And Municipal Securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	210,734	213,092
Held To Maturity Securities, Accumulated Unrecognized Holding Gain	7,177	6,266
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	276	389
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	217,635	218,969
Corporate Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	14,000	14,000
Held To Maturity Securities, Accumulated Unrecognized Holding Gain	70	48
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	920	1,020
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	13,150	13,028
Other Held-to-Maturity Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost		10,000
Held To Maturity Securities, Accumulated Unrecognized Holding Gain		0
Held To Maturity Securities, Accumulated Unrecognized Holding Loss		0
Held-to-maturity Securities, Debt Maturities, Fair Value, Total		10,000
US Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	18,347	17,636
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	321	252
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	0	0
Investment securities available-for-sale, at fair value	18,668	17,888
State and Municipal Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	163,331	178,263
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	11,491	10,899
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	15	227
Investment securities available-for-sale, at fair value	174,807	188,935
Residential Government Sponsored Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	25,462	27,450
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	854	884
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	29	60
Investment securities available-for-sale, at fair value	26,287	28,274
Other Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,738	1,972
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	123	131
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	0	0
Investment securities available-for-sale, at fair value	1,861	2,103
Corporate Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	18,030	13,808
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	96	4
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	60	197
Investment securities available-for-sale, at fair value	18,066	13,615
Schedule of Held-to-maturity Securities [Line Items]
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	920	1,020
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	11,648	6,145
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	167	85
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	233	321
Investment securities available-for-sale, at fair value	11,582	5,909
Other Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	39,478	12,764
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	44	0
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	202	198
Investment securities available-for-sale, at fair value	$39,320	$12,566

Investment_Securities_Investme

Investment Securities - Investments Classified by Contractual Maturity Date (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$1,648
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	21,682
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	18,338
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	224,718
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Total	266,386
Available-for-sale Equity Securities, Amortized Cost Basis	11,648
Available-for-sale Securities, Amortized Cost Basis	278,034	258,038
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	20,904
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	11,749
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	192,081
Held-to-maturity Securities, Debt Maturities, Amortized Cost, Total	224,734	237,092
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	1,650
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	22,121
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	18,566
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	236,672
Available-for-sale Securities, Debt Securities, Fair Value	279,009
Available-for-sale Securities, Equity Securities, Fair Value	11,582
Available-for-sale Securities, Fair Value	290,591	269,290
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	20,586
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	11,836
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	198,363
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	$230,785	$241,997

Investment_Securities_Schedule

Investment Securities - 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]
Proceeds from Sale of Available-for-sale Securities, Debt	$14,535	$34,158
Available-for-sale Securities, Gross Realized Gains	82	337
Gross Realized Losses on Sales	-33	-902
Total Realized Gains (Losses), Net	$49	($565)

Summary_of_Investment_Securiti

- Summary of Investment Securities, Continuous Unrealized Loss Position (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified	Security	Security
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$27,782	$16,687
Available For Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses Accumulated In Investments	96	201
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	13,160	36,776
Available For Sale Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Aggregate Losses Accumulated In Investments	443	802
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	40,942	53,463
Available For Sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated In Investments	539	1,003
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	8,509	2,148
Held to maturity Securities, Continuous Unrealized Loss Position Less Than 12 Months, Accumulated Loss	48	25
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	19,177	45,277
Held to maturity Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Accumulated Loss	1,148	1,384
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	27,686	47,425
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	1,196	1,409
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	10	5
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	7	18
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	9	2
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	19	37
State And Municipal Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,369	0
Available For Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses Accumulated In Investments	4	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	1,067	24,083
Available For Sale Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Aggregate Losses Accumulated In Investments	11	227
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,436	24,083
Available For Sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated In Investments	15	227
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	8,509	2,148
Held to maturity Securities, Continuous Unrealized Loss Position Less Than 12 Months, Accumulated Loss	48	25
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	16,097	42,297
Held to maturity Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Accumulated Loss	228	364
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	24,606	44,445
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	276	389
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	2	0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	1	11
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	9	2
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	18	36
Corporate Debt Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,181	10,134
Available For Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses Accumulated In Investments	34	172
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,974	2,975
Available For Sale Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Aggregate Losses Accumulated In Investments	26	25
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	7,155	13,109
Available For Sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated In Investments	60	197
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	0
Held to maturity Securities, Continuous Unrealized Loss Position Less Than 12 Months, Accumulated Loss	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,080	2,980
Held to maturity Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Accumulated Loss	920	1,020
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	3,080	2,980
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	920	1,020
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	1	3
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	1	1
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	0	0
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	1	1
Other Debt Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	15,745	0
Available For Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses Accumulated In Investments	43	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	4,614	4,566
Available For Sale Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Aggregate Losses Accumulated In Investments	159	198
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	20,359	4,566
Available For Sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated In Investments	202	198
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	6	0
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	1	1
Equity Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	5,487	1,850
Available For Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses Accumulated In Investments	15	18
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	760	676
Available For Sale Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Aggregate Losses Accumulated In Investments	218	303
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	6,247	2,526
Available For Sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated In Investments	233	321
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	1	1
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	1	1
Collateralized Mortgage Backed Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	4,703
Available For Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses Accumulated In Investments	0	11
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,745	4,476
Available For Sale Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Aggregate Losses Accumulated In Investments	29	49
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,745	9,179
Available For Sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated In Investments	$29	$60
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	0	1
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	3	4

Investment_Securities_Narrativ

Investment Securities - Narrative (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014
		Security	Security
Schedule of Investment Securities [Line Items]
Security Owned and Pledged as Collateral, Fair Value		$250.20	$269.20
Securities in unrealized loss position		30
Securities greater than 4 percent loss			0
State And Municipal Securities
Schedule of Investment Securities [Line Items]
Held-to-maturity Securities, Sold at Carrying Value	3.3
Corporate Debt Securities
Schedule of Investment Securities [Line Items]
Held-to-maturity Securities, Realized Gain (Loss)	$0.20

Loans_and_Allowance_for_Loan_L2

Loans and Allowance for Loan Losses - Schedule of Financing Receivables Originated and Acquired (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Net Provision For Loan Losses On Covered Loans	($700,000)	$0
Originated loans	2,262,601,000		2,116,441,000
Acquired loans	913,236,000		958,657,000
Loans and Leases Receivable, Net	3,175,837,000		3,075,098,000
Financing Receivable Covered by Loss Sharing Agreement	129,900,000		137,500,000
Unpaid Principal Balance Of Covered Acquired Loans	132,100,000		140,400,000
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Originated loans	1,327,759,000		1,181,492,000
Acquired loans	385,232,000		403,672,000
Loans and Leases Receivable, Net	1,712,991,000		1,585,164,000
Commercial construction
Financing Receivable, Recorded Investment [Line Items]
Originated loans	236,957,000		265,968,000
Acquired loans	44,146,000		48,668,000
Loans and Leases Receivable, Net	281,103,000		314,636,000
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Originated loans	163,695,000		154,132,000
Acquired loans	35,271,000		38,200,000
Loans and Leases Receivable, Net	198,966,000		192,332,000
Leases
Financing Receivable, Recorded Investment [Line Items]
Originated loans	21,489,000		21,100,000
Acquired loans	0		0
Loans and Leases Receivable, Net	21,489,000		21,100,000
Total commercial
Financing Receivable, Recorded Investment [Line Items]
Originated loans	1,749,900,000		1,622,692,000
Acquired loans	464,649,000		490,540,000
Loans and Leases Receivable, Net	2,214,549,000		2,113,232,000
Residential construction
Financing Receivable, Recorded Investment [Line Items]
Originated loans	49,614,000		43,298,000
Acquired loans	28,406,000		29,854,000
Loans and Leases Receivable, Net	78,020,000		73,152,000
Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Originated loans	451,968,000		439,600,000
Acquired loans	415,067,000		432,818,000
Loans and Leases Receivable, Net	867,035,000		872,418,000
Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Originated loans	11,119,000		10,851,000
Acquired loans	5,114,000		5,445,000
Loans and Leases Receivable, Net	$16,233,000		$16,296,000

Loans_and_Allowance_for_Loan_L3

Loans and Allowance for Loan Losses - Schedule of Changes in Accretable Yield and Carrying Value of Covered Acquired Loans (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accretable Yield
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	($2,213)	($6,058)
Reductions from payments and foreclosures, net	0	0
Reclass from non-accretable to accretable yield	-14	-221
Accretion	-599	-4,066
Balance at end of period	-1,628	-2,213
Carrying Amount
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	137,459	187,661
Reductions from payments and foreclosures, net	-8,217	-54,489
Reclass from non-accretable to accretable yield	14	221
Accretion	-599	-4,066
Balance at end of period	$129,855	$137,459

Loans_and_Allowance_for_Loan_L4

Loans and Allowance for Loan Losses - Analysis of Allowance for Loan Losses by Class of Financing Receivables (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	$30,399,000
Provision for loan losses	110,000	2,561,000
Change in FDIC Indemnification Asset	600,000	100,000
Loans and leases, Allowance, Ending Balance	29,351,000
Loans and Leases Receivable, Net	3,175,837,000		3,075,098,000
Net Provision For Loan Losses On Covered Loans	-700,000	0
Provision for Loan and Lease Losses Covered by the FDIC	100,000	100,000
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	12,685,000	14,752,000
Charge-offs	-1,546,000	-1,586,000
Recoveries	177,000	138,000
Provision for loan losses	1,573,000	67,000
Change in FDIC Indemnification Asset	-87,000	147,000
Loans and leases, Allowance, Ending Balance	12,802,000	13,518,000
Impaired loans	2,112,000		1,614,000
Purchase credit impaired loans	1,620,000		1,727,000
Total specific reserves	3,732,000		3,341,000
General reserves	9,070,000		9,344,000
Individually evaluated for impairment	33,027,000		27,578,000
Purchase credit impaired loans	78,558,000		82,477,000
Loans collectively evaluated for impairment	1,601,406,000		1,475,109,000
Loans and Leases Receivable, Net	1,712,991,000		1,585,164,000
Commercial construction
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	4,311,000	6,738,000
Charge-offs	-6,000	-1,580,000
Recoveries	774,000	549,000
Provision for loan losses	-1,314,000	199,000
Change in FDIC Indemnification Asset	-388,000	-239,000
Loans and leases, Allowance, Ending Balance	3,377,000	5,667,000
Impaired loans	159,000		118,000
Purchase credit impaired loans	226,000		424,000
Total specific reserves	385,000		542,000
General reserves	2,992,000		3,769,000
Individually evaluated for impairment	4,058,000		4,080,000
Purchase credit impaired loans	10,974,000		11,326,000
Loans collectively evaluated for impairment	266,071,000		299,230,000
Loans and Leases Receivable, Net	281,103,000		314,636,000
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	3,226,000	3,137,000
Charge-offs	-85,000	-1,254,000
Recoveries	213,000	113,000
Provision for loan losses	-206,000	1,200,000
Change in FDIC Indemnification Asset	-32,000	64,000
Loans and leases, Allowance, Ending Balance	3,116,000	3,260,000
Impaired loans	479,000		42,000
Purchase credit impaired loans	147,000		152,000
Total specific reserves	626,000		194,000
General reserves	2,490,000		3,032,000
Individually evaluated for impairment	1,751,000		1,264,000
Purchase credit impaired loans	4,380,000		4,591,000
Loans collectively evaluated for impairment	192,835,000		186,477,000
Loans and Leases Receivable, Net	198,966,000		192,332,000
Leases
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	103,000	56,000
Charge-offs	0	0
Recoveries	0	0
Provision for loan losses	-18,000	18,000
Change in FDIC Indemnification Asset	0	0
Loans and leases, Allowance, Ending Balance	85,000	74,000
Impaired loans	0		0
Purchase credit impaired loans	0		0
Total specific reserves	0		0
General reserves	85,000		103,000
Individually evaluated for impairment	0		0
Purchase credit impaired loans	0		0
Loans collectively evaluated for impairment	21,489,000		21,100,000
Loans and Leases Receivable, Net	21,489,000		21,100,000
Residential construction
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	570,000	213,000
Charge-offs	0	0
Recoveries	30,000	10,000
Provision for loan losses	-192,000	27,000
Change in FDIC Indemnification Asset	3,000	-6,000
Loans and leases, Allowance, Ending Balance	411,000	244,000
Impaired loans	58,000		230,000
Purchase credit impaired loans	3,000		0
Total specific reserves	61,000		230,000
General reserves	350,000		340,000
Individually evaluated for impairment	512,000		657,000
Purchase credit impaired loans	571,000		952,000
Loans collectively evaluated for impairment	76,937,000		71,543,000
Loans and Leases Receivable, Net	78,020,000		73,152,000
Residential mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	9,313,000	7,730,000
Charge-offs	-288,000	-1,064,000
Recoveries	192,000	142,000
Provision for loan losses	195,000	949,000
Change in FDIC Indemnification Asset	-67,000	61,000
Loans and leases, Allowance, Ending Balance	9,345,000	7,818,000
Impaired loans	1,932,000		972,000
Purchase credit impaired loans	1,359,000		1,556,000
Total specific reserves	3,291,000		2,528,000
General reserves	6,054,000		6,785,000
Individually evaluated for impairment	17,357,000		13,019,000
Purchase credit impaired loans	47,742,000		50,164,000
Loans collectively evaluated for impairment	801,936,000		809,235,000
Loans and Leases Receivable, Net	867,035,000		872,418,000
Consumer and other
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	191,000	249,000
Charge-offs	-56,000	-92,000
Recoveries	11,000	9,000
Provision for loan losses	72,000	101,000
Change in FDIC Indemnification Asset	-3,000	32,000
Loans and leases, Allowance, Ending Balance	215,000	299,000
Impaired loans	9,000		13,000
Purchase credit impaired loans	9,000		11,000
Total specific reserves	18,000		24,000
General reserves	197,000		167,000
Individually evaluated for impairment	92,000		126,000
Purchase credit impaired loans	851,000		872,000
Loans collectively evaluated for impairment	15,290,000		15,298,000
Loans and Leases Receivable, Net	16,233,000		16,296,000
Financing Receivable
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	30,399,000	32,875,000
Charge-offs	-1,981,000	-5,576,000
Recoveries	1,397,000	961,000
Provision for loan losses	110,000	2,561,000
Change in FDIC Indemnification Asset	-574,000	59,000
Loans and leases, Allowance, Ending Balance	29,351,000	30,880,000
Impaired loans	4,749,000		2,989,000
Purchase credit impaired loans	3,364,000		3,870,000
Total specific reserves	8,113,000		6,859,000
General reserves	21,238,000		23,540,000
Individually evaluated for impairment	56,797,000		46,724,000
Purchase credit impaired loans	143,076,000		150,382,000
Loans collectively evaluated for impairment	2,975,964,000		2,877,992,000
Loans and Leases Receivable, Net	$3,175,837,000		$3,075,098,000

Loans_and_Allowance_for_Loan_L5

Loans and Allowance for Loan Losses - Schedule of Impaired Loans (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	$29,338	$22,045
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	29,630	22,027
Impaired Financing Receivable, Allowances for Loan Losses Allocated	4,749	2,989
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	31,616	33,293
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	31,757	33,782
Originated | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	13,223	10,110
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	13,188	10,089
Impaired Financing Receivable, Allowances for Loan Losses Allocated	2,068	1,571
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	19,435	17,095
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	19,416	17,071
Originated | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,599	1,734
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,595	1,728
Impaired Financing Receivable, Allowances for Loan Losses Allocated	134	105
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,269	2,227
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,262	2,218
Originated | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,297	798
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,287	790
Impaired Financing Receivable, Allowances for Loan Losses Allocated	453	26
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	264	268
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	267	271
Originated | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	348	350
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	347	349
Impaired Financing Receivable, Allowances for Loan Losses Allocated	43	44
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	0
Originated | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	7,764	6,278
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	7,739	6,260
Impaired Financing Receivable, Allowances for Loan Losses Allocated	1,120	694
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,645	5,057
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	4,632	5,045
Originated | Consumer Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	93	127
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	92	126
Impaired Financing Receivable, Allowances for Loan Losses Allocated	9	13
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	0
Originated | Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	24,324	19,397
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	24,248	19,342
Impaired Financing Receivable, Allowances for Loan Losses Allocated	3,827	2,453
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	26,613	24,647
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	26,577	24,605
Acquired (non-covered) | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	424	429
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	424	428
Impaired Financing Receivable, Allowances for Loan Losses Allocated	43	43
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	628	796
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	645	824
Acquired (non-covered) | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	203	133
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	201	132
Impaired Financing Receivable, Allowances for Loan Losses Allocated	25	13
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	264	469
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	264	467
Acquired (non-covered) | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	198	204
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	197	203
Impaired Financing Receivable, Allowances for Loan Losses Allocated	27	16
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	1
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	27	28
Acquired (non-covered) | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	165
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	165
Impaired Financing Receivable, Allowances for Loan Losses Allocated	15
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0
Acquired (non-covered) | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		308
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		308
Impaired Financing Receivable, Allowances for Loan Losses Allocated		185
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		114
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		114
Acquired (non-covered) | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	4,024	1,574
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	4,395	1,614
Impaired Financing Receivable, Allowances for Loan Losses Allocated	812	279
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,111	7,266
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	4,244	7,744
Acquired (non-covered) | Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,014	2,648
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,382	2,685
Impaired Financing Receivable, Allowances for Loan Losses Allocated	922	536
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,003	8,646
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	$5,180	$9,177

Loans_and_Allowance_for_Loan_L6

Loans and Allowance for Loan Losses - Schedule of Average Recorded Investments and Interest Income Recognized on Impaired Loans (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	$12,565	$21,276
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	81	205
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	19,308	12,966
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	98	38
Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,774	4,144
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	18	37
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,589	7,126
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	15	37
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,433	1,545
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	12	10
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	262	326
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0
Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	114	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0
Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	404	365
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	3	3
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	9,722	7,601
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	15	44
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10,647	11,266
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	46	45
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	104	107
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	1	0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		56
Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	26,002	35,038
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	130	299
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	32,920	31,740
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	$159	$120

Loans_and_Allowance_for_Loan_L7

Loans and Allowance for Loan Losses - Aging of Financing Receivables (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net	$3,175,837	$3,075,098
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net	1,712,991	1,585,164
Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net	281,103	314,636
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net	198,966	192,332
Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net	21,489	21,100
Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net	78,020	73,152
Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net	867,035	872,418
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net	16,233	16,296
Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	27,967	24,723
Financing Receivable, Recorded Investment, Total Past Due	35,575	34,439
Financing Receivable, Recorded Investment, Current	3,140,262	3,040,659
Loans and Leases Receivable, Net	3,175,837	3,075,098
Originated | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	8,673	3,476
Financing Receivable, Recorded Investment, Total Past Due	9,553	5,450
Financing Receivable, Recorded Investment, Current	1,318,206	1,176,042
Loans and Leases Receivable, Net	1,327,759	1,181,492
Originated | Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	1,009	1,084
Financing Receivable, Recorded Investment, Total Past Due	1,122	1,096
Financing Receivable, Recorded Investment, Current	235,835	264,872
Loans and Leases Receivable, Net	236,957	265,968
Originated | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	502	417
Financing Receivable, Recorded Investment, Total Past Due	657	543
Financing Receivable, Recorded Investment, Current	163,038	153,589
Loans and Leases Receivable, Net	163,695	154,132
Originated | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivable, Recorded Investment, Current	21,489	21,100
Loans and Leases Receivable, Net	21,489	21,100
Originated | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0
Financing Receivable, Recorded Investment, Total Past Due	0	200
Financing Receivable, Recorded Investment, Current	49,614	43,098
Loans and Leases Receivable, Net	49,614	43,298
Originated | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	4,592	3,498
Financing Receivable, Recorded Investment, Total Past Due	6,444	6,274
Financing Receivable, Recorded Investment, Current	445,524	433,326
Loans and Leases Receivable, Net	451,968	439,600
Originated | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0
Financing Receivable, Recorded Investment, Total Past Due	97	6
Financing Receivable, Recorded Investment, Current	11,022	10,845
Loans and Leases Receivable, Net	11,119	10,851
Originated | Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	14,776	8,475
Financing Receivable, Recorded Investment, Total Past Due	17,873	13,569
Financing Receivable, Recorded Investment, Current	2,244,728	2,102,872
Loans and Leases Receivable, Net	2,262,601	2,116,441
Acquired (non-covered) | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	3,551	4,508
Financing Receivable, Recorded Investment, Total Past Due	4,484	5,543
Financing Receivable, Recorded Investment, Current	380,748	398,129
Loans and Leases Receivable, Net	385,232	403,672
Acquired (non-covered) | Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	559	779
Financing Receivable, Recorded Investment, Total Past Due	810	1,076
Financing Receivable, Recorded Investment, Current	43,336	47,592
Loans and Leases Receivable, Net	44,146	48,668
Acquired (non-covered) | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	197	197
Financing Receivable, Recorded Investment, Total Past Due	313	345
Financing Receivable, Recorded Investment, Current	34,958	37,855
Loans and Leases Receivable, Net	35,271	38,200
Acquired (non-covered) | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	165	422
Financing Receivable, Recorded Investment, Total Past Due	584	422
Financing Receivable, Recorded Investment, Current	27,822	29,432
Loans and Leases Receivable, Net	28,406	29,854
Acquired (non-covered) | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	8,668	10,312
Financing Receivable, Recorded Investment, Total Past Due	11,397	13,360
Financing Receivable, Recorded Investment, Current	403,670	419,458
Loans and Leases Receivable, Net	415,067	432,818
Acquired (non-covered) | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	51	30
Financing Receivable, Recorded Investment, Total Past Due	114	124
Financing Receivable, Recorded Investment, Current	5,000	5,321
Loans and Leases Receivable, Net	5,114	5,445
Acquired (non-covered) | Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	13,191	16,248
Financing Receivable, Recorded Investment, Total Past Due	17,702	20,870
Financing Receivable, Recorded Investment, Current	895,534	937,787
Loans and Leases Receivable, Net	913,236	958,657
Financing Receivables, 30 to 59 Days Past Due [Member] | Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	6,312	7,325
Financing Receivables, 30 to 59 Days Past Due [Member] | Originated | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	880	1,974
Financing Receivables, 30 to 59 Days Past Due [Member] | Originated | Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	11	12
Financing Receivables, 30 to 59 Days Past Due [Member] | Originated | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	131	102
Financing Receivables, 30 to 59 Days Past Due [Member] | Originated | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Originated | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	200
Financing Receivables, 30 to 59 Days Past Due [Member] | Originated | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	1,667	1,508
Financing Receivables, 30 to 59 Days Past Due [Member] | Originated | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	16	6
Financing Receivables, 30 to 59 Days Past Due [Member] | Originated | Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	2,705	3,802
Financing Receivables, 30 to 59 Days Past Due [Member] | Acquired (non-covered) | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	814	880
Financing Receivables, 30 to 59 Days Past Due [Member] | Acquired (non-covered) | Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	161	230
Financing Receivables, 30 to 59 Days Past Due [Member] | Acquired (non-covered) | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	116	121
Financing Receivables, 30 to 59 Days Past Due [Member] | Acquired (non-covered) | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	419	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Acquired (non-covered) | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	2,060	2,200
Financing Receivables, 30 to 59 Days Past Due [Member] | Acquired (non-covered) | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	37	92
Financing Receivables, 30 to 59 Days Past Due [Member] | Acquired (non-covered) | Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	3,607	3,523
Financing Receivables, 60 to 89 Days Past Due [Member] | Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	1,296	2,391
Financing Receivables, 60 to 89 Days Past Due [Member] | Originated | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Originated | Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	102	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Originated | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	24	24
Financing Receivables, 60 to 89 Days Past Due [Member] | Originated | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Originated | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Originated | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	185	1,268
Financing Receivables, 60 to 89 Days Past Due [Member] | Originated | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	81	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Originated | Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	392	1,292
Financing Receivables, 60 to 89 Days Past Due [Member] | Acquired (non-covered) | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	119	155
Financing Receivables, 60 to 89 Days Past Due [Member] | Acquired (non-covered) | Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	90	67
Financing Receivables, 60 to 89 Days Past Due [Member] | Acquired (non-covered) | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	27
Financing Receivables, 60 to 89 Days Past Due [Member] | Acquired (non-covered) | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Acquired (non-covered) | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	669	848
Financing Receivables, 60 to 89 Days Past Due [Member] | Acquired (non-covered) | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	26	2
Financing Receivables, 60 to 89 Days Past Due [Member] | Acquired (non-covered) | Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	904	1,099
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Originated | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Originated | Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Originated | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Originated | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Originated | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Originated | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Originated | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Originated | Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Acquired (non-covered) | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Acquired (non-covered) | Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Acquired (non-covered) | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Acquired (non-covered) | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Acquired (non-covered) | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Acquired (non-covered) | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Acquired (non-covered) | Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Total Past Due	$0	$0

Loans_and_Allowance_for_Loan_L8

Loans and Allowance for Loan Losses - Financing Receivable Credit Quality indicators (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	$3,175,837	$3,075,098
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	1,712,991	1,585,164
Commercial construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	281,103	314,636
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	198,966	192,332
Leases
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	21,489	21,100
Residential construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	78,020	73,152
Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	867,035	872,418
Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	16,233	16,296
Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	3,175,837	3,075,098
Pass Credits	2,907,487	2,803,863
Special Mention	150,975	156,589
Substandard	116,770	112,853
Doubtful	605	1,793
Loss	0	0
Originated | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	1,327,759	1,181,492
Pass Credits	1,248,008	1,100,361
Special Mention	41,450	46,935
Substandard	38,301	34,196
Doubtful	0	0
Loss	0	0
Originated | Commercial construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	236,957	265,968
Pass Credits	227,477	256,987
Special Mention	6,128	5,530
Substandard	3,352	3,451
Doubtful	0	0
Loss	0	0
Originated | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	163,695	154,132
Pass Credits	155,177	145,722
Special Mention	3,854	3,980
Substandard	4,664	4,430
Doubtful	0	0
Loss	0	0
Originated | Leases
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	21,489	21,100
Pass Credits	21,489	21,100
Special Mention	0	0
Substandard	0	0
Doubtful	0	0
Loss	0	0
Originated | Residential construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	49,614	43,298
Pass Credits	49,267	42,806
Special Mention	0	143
Substandard	347	349
Doubtful	0	0
Loss	0	0
Originated | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	451,968	439,600
Pass Credits	419,218	407,319
Special Mention	20,217	20,946
Substandard	12,533	11,335
Doubtful	0	0
Loss	0	0
Originated | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	11,119	10,851
Pass Credits	10,640	10,331
Special Mention	387	428
Substandard	92	92
Doubtful	0	0
Loss	0	0
Originated | Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	2,262,601	2,116,441
Pass Credits	2,131,276	1,984,626
Special Mention	72,036	77,962
Substandard	59,289	53,853
Doubtful	0	0
Loss	0	0
Acquired (non-covered) | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	385,232	403,672
Pass Credits	324,353	342,240
Special Mention	34,310	35,816
Substandard	26,485	25,531
Doubtful	84	85
Loss	0	0
Acquired (non-covered) | Commercial construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	44,146	48,668
Pass Credits	31,345	36,346
Special Mention	6,475	5,910
Substandard	6,326	6,320
Doubtful	0	92
Loss	0	0
Acquired (non-covered) | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	35,271	38,200
Pass Credits	33,179	36,039
Special Mention	788	644
Substandard	1,284	1,482
Doubtful	20	35
Loss	0	0
Acquired (non-covered) | Residential construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	28,406	29,854
Pass Credits	27,176	28,833
Special Mention	394	0
Substandard	836	1,021
Doubtful	0	0
Loss	0	0
Acquired (non-covered) | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	415,067	432,818
Pass Credits	355,221	370,523
Special Mention	36,846	36,098
Substandard	22,499	24,616
Doubtful	501	1,581
Loss	0	0
Acquired (non-covered) | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	5,114	5,445
Pass Credits	4,937	5,256
Special Mention	126	159
Substandard	51	30
Doubtful	0	0
Loss	0	0
Acquired (non-covered) | Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	913,236	958,657
Pass Credits	776,211	819,237
Special Mention	78,939	78,627
Substandard	57,481	59,000
Doubtful	605	1,793
Loss	$0	$0

Loans_and_Allowance_for_Loan_L9

Loans and Allowance for Loan Losses - Troubled Debt Restructurings on Financing Receivables (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Commercial construction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$1,389	$1,391
Financing Receivables, Modifications, Allowance For Loan Losses Allocated	14	16
Commercial construction | Accrual
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,339	1,341
Commercial construction | Nonaccrual
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	50	50
Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,077	3,835
Financing Receivables, Modifications, Allowance For Loan Losses Allocated	243	165
Commercial real estate | Accrual
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,077	3,835
Commercial real estate | Nonaccrual
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	0
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,063	651
Financing Receivables, Modifications, Allowance For Loan Losses Allocated	398	25
Commercial and industrial | Accrual
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,063	651
Commercial and industrial | Nonaccrual
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	0
Residential mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,611	7,641
Financing Receivables, Modifications, Allowance For Loan Losses Allocated	744	592
Residential mortgage | Accrual
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,596	7,625
Residential mortgage | Nonaccrual
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	15	16
Consumer and other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	92	126
Financing Receivables, Modifications, Allowance For Loan Losses Allocated	10	13
Consumer and other | Accrual
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	92	126
Consumer and other | Nonaccrual
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	0
Total Troubled Debt Restructurings
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	15,232	13,644
Financing Receivables, Modifications, Allowance For Loan Losses Allocated	1,409	811
Total Number Of Contracts	37	35
Total Troubled Debt Restructurings | Accrual
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	15,167	13,578
Total Number Of Contracts	35	33
Total Troubled Debt Restructurings | Nonaccrual
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$65	$66
Total Number Of Contracts	2	2

Recovered_Sheet1

Loans and Allowance for Loan Losses - Troubled Debt Restructurings by Modification Category (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Financing Receivable, Modifications [Line Items]
Commercial Real Estate	$1,280	$1,338
Commercial and Industrial	419
Total Modifications	1,699
Term Modification [Member]
Financing Receivable, Modifications [Line Items]
Commercial Real Estate	417
Total Modifications	417
Payment Modification [Member]
Financing Receivable, Modifications [Line Items]
Commercial Real Estate		1,338
Commercial and Industrial	419
Total Modifications	419
Combination Modification [Member]
Financing Receivable, Modifications [Line Items]
Commercial Real Estate	863
Total Modifications	$863

Recovered_Sheet2

Loans and Allowance for Loan Losses - Loans Modified in Troubled Debt Restructurings During the Previous 12 months Which Experienced a Payment Default, Period End Balance (Details) (USD $)	12 Months Ended	3 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2014	Mar. 31, 2015
Residential mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable Subsequent Default	$0
Residential mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable Subsequent Default		110
Consumer Loan
Financing Receivable, Modifications [Line Items]
Financing Receivable Subsequent Default			$34

Recovered_Sheet3

Loans and Allowance for Loan Losses - Loan Sale Activity On Single Family Residential First Mortgage Loans Originated For Sale On A Presold Basis (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Receivables [Abstract]
Loans Receivable Held-for-sale, Net	$25,505	$18,895	$37,280
Proceeds from sales of loans held for sale	89,922	69,412
Mortgage fees	$2,499	$1,558

Recovered_Sheet4

Loans and Allowance for Loan Losses - Narrative (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Mortgage Loans in Process of Foreclosure, Amount	$1,200,000	$2,500,000
Loans and Leases Receivable, Collateral for Secured Borrowings	1,170,000,000	1,100,000,000
Loans and Leases Receivable, Impaired, Commitment to Lend	$0

FDIC_Indemnification_Asset_FDI

FDIC Indemnification Asset - FDIC Indemnification Asset Roll Forward (Details) (USD $)	3 Months Ended	12 Months Ended	18 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Oct. 14, 2011
FDIC Indemnification Asset [Abstract]
Description of Regulatory Assistance		80.00%
FDIC Indemnification Asset [Roll Forward]
FDIC Indemnification Asset, Beginning Balance	$5,097	$16,886
Accretion of Present Value Discount, Net	92	1,061
FDIC Indemnification Asset, Acquisitions	261	-2,920
Receipt of Payments from FDIC	-611	-9,930
FDIC Indemnification Asset, Ending Balance	$4,839	$5,097
Commercial and Other Loans, Excluding Single Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term of FDIC loss sharing agreement			5 years
Term of FDIC recovery reimbursement agreement			8 years
Single Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term of FDIC loss sharing agreement			10 years
Term of FDIC recovery reimbursement agreement			10 years

Derivatives_Schedule_of_Intere

Derivatives - Schedule of Interest Rate Derivatives (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Interest Rate Derivatives [Line Items]
Derivative Asset, Fair Value, Gross Asset	$3,704	$1,754
Designated as Hedging Instrument | Interest Rate Swap
Interest Rate Derivatives [Line Items]
Derivative Liability, Notional Amount	125,000	125,000
Designated as Hedging Instrument | Interest Rate Swap | Accrued Expenses and Other Liabilities
Interest Rate Derivatives [Line Items]
Derivative Liability, Fair Value, Gross Liability	1,604	308
Not Designated as Hedging Instrument
Interest Rate Derivatives [Line Items]
Derivative Asset, Notional Amount	35,900	34,700
Not Designated as Hedging Instrument | Interest Rate Swap
Interest Rate Derivatives [Line Items]
Derivative Asset, Notional Amount	35,926	34,692
Derivative Liability, Notional Amount	35,926	34,692
Not Designated as Hedging Instrument | Interest Rate Swap | Other Assets
Interest Rate Derivatives [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,050	723
Not Designated as Hedging Instrument | Interest Rate Swap | Accrued Expenses and Other Liabilities
Interest Rate Derivatives [Line Items]
Derivative Liability, Fair Value, Gross Liability	$1,050	$723

Derivatives_Summary_of_Offsett

Derivatives - Summary of Offsetting Assets and Liabilities (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$3,704	$1,754
Derivative Asset	3,704	1,754
Derivative, Collateral, Right to Reclaim Cash	2,654	1,031
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	1,050	723
Derivative Assets
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,050	723
Derivative Asset	1,050	723
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	1,050	723
Derivative Liabilities
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	2,654	1,031
Derivative Asset	2,654	1,031
Derivative, Collateral, Right to Reclaim Cash	2,654	1,031
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	$0	$0

Derivatives_Schedule_of_Cash_F

Derivatives - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Amount of net gain (losses) recorded in OCI (effective portion)	$816	$576
Amount of net loss reclassified from OCI to earnings	$0	$286

Derivatives_Narrative_Details

Derivatives - Narrative (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative, Maturity Date	18-Mar-19
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)	$816,000	$576,000
Accumulated other comprehensive income	-10,087,000	-6,818,000		-10,182,000	-3,306,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	1,400,000
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness	0	0
Derivative, Net Liability Position, Aggregate Fair Value	2,700,000
Collateral Already Posted, Aggregate Fair Value	4,800,000
2013 Interest Rate Swap Derivative Contract
Derivative [Line Items]
Derivative, Notional Amount			125,000,000
Amount Designated To Unsecured Variable Rate Money Market Funding Arrangement			125,000,000
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Derivative [Line Items]
Accumulated other comprehensive income	1,012,000	-1,151,000		196,000	-1,441,000
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Notional Amount	35,900,000			34,700,000
Interest Rate Swap | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Notional Amount	35,926,000			34,692,000
Accrued Expenses and Other Liabilities | Interest Rate Swap | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	$1,050,000			$723,000

Borrowings_Schedule_of_Short_T

Borrowings - Schedule of Short Term Borrowings (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]
Securities Sold under Agreements to Repurchase	$28,654	$25,834
Federal Home Loan Bank, Advances, Short-term	18,000	102,100
Federal Funds Purchased	15,000	0
Short-term Debt	$61,654	$127,934

Borrowings_Schedule_of_LongTer

Borrowings - Schedule of Long-Term Debt (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]
FHLB advances	$52,000	$52,000
Subordinated notes	60,000	60,000
Junior subordinated debenture	23,713	23,713
Long-term Debt, Gross	135,713	135,713
FHLB Prepayment Penalty	1,708	1,899
Long-term debt	$134,005	$133,814

Borrowings_Schedule_of_Federal

Borrowings - Schedule of Federal Home Loan Bank Advances (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Federal Home Loan Bank, Advances [Line Items]
FHLB advances	$52,000	$52,000
July 2016 0.88% [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances	2,000	2,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	0.88%
August 2016 1.72% [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances	2,000	2,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	1.72%
January 2018 2.15% [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances	15,000	15,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	2.15%
January 2018 2.27% [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances	10,000	10,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	2.27%
July 2018 1.78% [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances	3,000	3,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	1.78%
January 2020 0.47% Advance I [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances	10,000	10,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	0.47%
January 2020 0.47% Advance II [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances	$10,000	$10,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	0.47%

Borrowings_Additional_Informat

Borrowings - Additional Information (Details) (USD $)	0 Months Ended
	Nov. 14, 2014	Mar. 31, 2015	Dec. 31, 2014	Nov. 14, 2014
Short-term Debt [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available		$582,100,000
Federal Reserve Bank Amount Of Available Unused Funds		208,100,000
Federal Funds Borrowed		0
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Expiration Period	364 days
Line of Credit Facility, Maximum Borrowing Capacity	15,000,000			15,000,000
Line of Credit, Current		0	0
Mortgage Loans on Real Estate [Member] | Federal Home Loan Bank [Member]
Short-term Debt [Line Items]
Fair Value of Securities Received as Collateral that Can be Resold or Repledged		821,300,000
Investment Securities [Member] | Federal Home Loan Bank [Member]
Short-term Debt [Line Items]
Fair Value of Securities Received as Collateral that Can be Resold or Repledged		7,400,000
Investment Securities [Member] | Federal Reserve Bank [Member]
Short-term Debt [Line Items]
Fair Value of Securities Received as Collateral that Can be Resold or Repledged		2,800,000
Total commercial | Federal Reserve Bank [Member]
Short-term Debt [Line Items]
Fair Value of Securities Received as Collateral that Can be Resold or Repledged		$346,200,000

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	$10,182	$3,306
Other Comprehensive Income Before Reclassifications	38	3,080
Amounts Reclassified From Accumulated Other Comprehensive Income	-133	432
Total other comprehensive income (loss)	-95	3,512
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	10,087	6,818
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	7,089	-1,946
Other Comprehensive Income Before Reclassifications	854	3,656
Amounts Reclassified From Accumulated Other Comprehensive Income	-31	356
Total other comprehensive income (loss)	823	4,012
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	7,912	2,066
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss)	-95	3,512
Unrealized Holding Gains Investment Securities Transferred From Available For Sale To Held To Maturity
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	3,289	3,811
Other Comprehensive Income Before Reclassifications	0	0
Amounts Reclassified From Accumulated Other Comprehensive Income	-102	-210
Total other comprehensive income (loss)	-102	-210
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	3,187	3,601
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	-196	1,441
Other Comprehensive Income Before Reclassifications	-816	-576
Amounts Reclassified From Accumulated Other Comprehensive Income	0	286
Total other comprehensive income (loss)	-816	-290
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	($1,012)	$1,151

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income - Reclassification Out of Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	($3,511)	($2,023)
Amounts Reclassified From Accumulated Other Comprehensive Income	133	-432
Unrealized Holding Gains Investment Securities Transferred From Available For Sale To Held To Maturity
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts Reclassified From Accumulated Other Comprehensive Income	102	210
Unrealized Holding Gains Investment Securities Transferred From Available For Sale To Held To Maturity | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts Reclassified From Accumulated Other Comprehensive Income	102	210
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts Reclassified From Accumulated Other Comprehensive Income	31	-356
Accumulated Net Unrealized Investment Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts Reclassified From Accumulated Other Comprehensive Income	31	-356
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts Reclassified From Accumulated Other Comprehensive Income	0	-286
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts Reclassified From Accumulated Other Comprehensive Income	0	-286
Gain (Loss) on Sale of Investment Securities, Net | Accumulated Net Unrealized Investment Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax	49	-565
Interest Income - Investment Securities | Unrealized Holding Gains Investment Securities Transferred From Available For Sale To Held To Maturity | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax	161	334
Income Tax Benefit (Expense) | Unrealized Holding Gains Investment Securities Transferred From Available For Sale To Held To Maturity | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	-59	-124
Income Tax Benefit (Expense) | Accumulated Net Unrealized Investment Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	-18	-209
Income Tax Benefit (Expense) | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	0	171
Interest Expense - Demand Deposits | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax	$0	($457)

Fair_Value_Measurements_Schedu

Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities, Measured on Recurring Basis (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	$290,591	$269,290
Derivative Asset, Fair Value, Gross Asset	3,704	1,754
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	760	676
Derivative Instruments in Hedges, Liabilities, at Fair Value	0	0
Derivative Liability	0	0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	289,831	268,614
Derivative Instruments in Hedges, Liabilities, at Fair Value	1,604	308
Derivative Liability	1,050	723
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0	0
Derivative Liability	0	0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	290,591	269,290
Derivative Asset, Fair Value, Gross Asset	1,050	723
Assets, Fair Value Disclosure, Recurring	291,641	270,013
Liabilities, Fair Value Disclosure, Recurring	2,654	1,031
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	760	676
Derivative Asset, Fair Value, Gross Asset	0	0
Assets, Fair Value Disclosure, Recurring	760	676
Liabilities, Fair Value Disclosure, Recurring	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	289,831	268,614
Derivative Asset, Fair Value, Gross Asset	1,050	723
Assets, Fair Value Disclosure, Recurring	290,881	269,337
Liabilities, Fair Value Disclosure, Recurring	2,654	1,031
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Derivative Asset, Fair Value, Gross Asset	0	0
Assets, Fair Value Disclosure, Recurring	0	0
Liabilities, Fair Value Disclosure, Recurring	0	0
US Government Agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	18,668	17,888
US Government Agencies | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	18,668	17,888
US Government Agencies | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
US Government Agencies | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	18,668	17,888
US Government Agencies | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
State And Municipal Securities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	174,807	188,935
State And Municipal Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
State And Municipal Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	174,807	188,935
State And Municipal Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	18,066	13,615
Corporate Debt Securities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	18,066	13,615
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	18,066	13,615
Corporate Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Other Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	39,320	12,566
Other Debt Securities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	39,320	12,566
Other Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Other Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	39,320	12,566
Other Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	11,582	5,909
Equity Securities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	11,582	5,909
Equity Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	760	676
Equity Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	10,822	5,233
Equity Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Residential Government Sponsored Mortgage Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	26,287	28,274
Residential Government Sponsored Mortgage Backed Securities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	26,287	28,274
Residential Government Sponsored Mortgage Backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Residential Government Sponsored Mortgage Backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	26,287	28,274
Residential Government Sponsored Mortgage Backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Other Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	1,861	2,103
Other Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	1,861	2,103
Other Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Other Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	1,861	2,103
Other Mortgage-backed Securities, Issued by US Government Sponsored Enterprises | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available-for-sale, at fair value	0	0
Interest Rate Swap | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	1,050	723
Derivative Instruments in Hedges, Liabilities, at Fair Value	1,604	308
Derivative Liability	1,050	723
Interest Rate Swap | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0	0
Derivative Liability	0	0
Interest Rate Swap | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	1,050	723
Derivative Instruments in Hedges, Liabilities, at Fair Value	1,604	308
Derivative Liability	1,050	723
Interest Rate Swap | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0	0
Derivative Liability	$0	$0

Fair_Value_Measurements_Summar

Fair Value Measurements - Summary of Fair Value Measurements, Nonrecurring (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Financing Receivable, Recorded Investment	$191,760
Other Real Estate	39,427
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	25,505	37,280
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	0	0
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	25,505	37,280
Impaired Financing Receivable, Recorded Investment	191,760	190,247
Other Real Estate	39,427	42,531
Assets, Fair Value Disclosure, Nonrecurring	256,692	270,058
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	0	0
Impaired Financing Receivable, Recorded Investment	0	0
Other Real Estate	0	0
Assets, Fair Value Disclosure, Nonrecurring	0	0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	25,505	37,280
Impaired Financing Receivable, Recorded Investment	0	0
Other Real Estate	0	0
Assets, Fair Value Disclosure, Nonrecurring	25,505	37,280
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	0	0
Impaired Financing Receivable, Recorded Investment	191,760	190,247
Other Real Estate	39,427	42,531
Assets, Fair Value Disclosure, Nonrecurring	$231,187	$232,778

Fair_Value_Measurements_Summar1

Fair Value Measurements - Summary of Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired Financing Receivable, Recorded Investment	191,760
Other Real Estate	39,427
Appraisal Valuation | Impaired Financing Receivable, Recorded Investment Member
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Techniques	Appraised value
Appraisal Valuation | Other Real Estate Owned
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Measurements, Valuation Techniques	Appraised value
Minimum | Appraisal Valuation | Impaired Financing Receivable, Recorded Investment Member
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments	0.00%
Minimum | Appraisal Valuation | Other Real Estate Owned
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments	0.00%
Maximum | Appraisal Valuation | Impaired Financing Receivable, Recorded Investment Member
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments	20.00%
Maximum | Appraisal Valuation | Other Real Estate Owned
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Inputs, Comparability Adjustments	20.00%

Fair_Value_Measurements_Summar2

Fair Value Measurements - Summary of Fair Value, Balance Sheet Grouping (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale, at fair value	$290,591	$269,290
Held-to-maturity Securities, Fair Value	230,785	241,997
Accrued interest receivable	13,186	14,514
FDIC indemnification asset	4,839	5,097	16,886
Bank Owned Life Insurance	94,102	93,396
Derivative Asset	3,704	1,754
Time deposits	1,323,537	1,203,674
Short-term Debt	61,654	127,934
Long-term debt	134,005	133,814
Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	96,238	85,194
Investment securities available-for-sale, at fair value	290,591	269,290
Held-to-maturity Securities, Fair Value	224,734	237,092
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	6,638	10,562
Loans Held-for-sale, Fair Value Disclosure	25,505	37,280
Loans Receivable, Fair Value Disclosure	3,146,486	3,044,699
Accrued interest receivable	13,186	14,514
FDIC indemnification asset	4,839	5,097
Bank Owned Life Insurance	94,102	93,396
Demand deposits and savings	2,229,389	2,192,723
Time deposits	1,323,537	1,203,674
Short-term Debt	61,654	127,934
Long-term debt	134,005	133,814
Interest Payable	2,715	2,011
Derivative Instruments in Hedges, Liabilities, at Fair Value	1,604	308
Derivative Liability	1,050	723
Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	96,238	85,194
Investment securities available-for-sale, at fair value	290,591	269,290
Held-to-maturity Securities, Fair Value	230,785	241,997
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	6,638	10,562
Loans Held-for-sale, Fair Value Disclosure	25,505	37,280
Loans Receivable, Fair Value Disclosure	3,173,125	3,070,477
Accrued interest receivable	13,186	14,514
FDIC indemnification asset	4,839	5,097
Bank Owned Life Insurance	94,102	93,396
Demand deposits and savings	2,229,389	2,192,723
Time deposits	1,340,133	1,218,869
Short-term Debt	61,654	127,934
Long-term debt	132,039	131,417
Interest Payable	2,715	2,011
Derivative Instruments in Hedges, Liabilities, at Fair Value	1,604	308
Derivative Liability	1,050	723
Fair Value, Inputs, Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	96,238	85,194
Investment securities available-for-sale, at fair value	760	676
Held-to-maturity Securities, Fair Value	0	0
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	0	0
Loans Held-for-sale, Fair Value Disclosure	0	0
Loans Receivable, Fair Value Disclosure	0	0
Accrued interest receivable	0	0
FDIC indemnification asset	0	0
Bank Owned Life Insurance	0	0
Demand deposits and savings	0	0
Time deposits	0	0
Short-term Debt	0	0
Long-term debt	0	0
Interest Payable	0	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0	0
Derivative Liability	0	0
Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Investment securities available-for-sale, at fair value	289,831	268,614
Held-to-maturity Securities, Fair Value	230,785	241,997
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	6,638	10,562
Loans Held-for-sale, Fair Value Disclosure	25,505	37,280
Loans Receivable, Fair Value Disclosure	2,981,365	2,880,230
Accrued interest receivable	13,186	14,514
FDIC indemnification asset	0	0
Bank Owned Life Insurance	94,102	93,396
Demand deposits and savings	2,229,389	2,192,723
Time deposits	1,340,133	1,218,869
Short-term Debt	61,654	127,934
Long-term debt	132,039	131,417
Interest Payable	2,715	2,011
Derivative Instruments in Hedges, Liabilities, at Fair Value	1,604	308
Derivative Liability	1,050	723
Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Investment securities available-for-sale, at fair value	0	0
Held-to-maturity Securities, Fair Value	0	0
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	0	0
Loans Held-for-sale, Fair Value Disclosure	0	0
Loans Receivable, Fair Value Disclosure	191,760	190,247
Accrued interest receivable	0	0
FDIC indemnification asset	4,839	5,097
Bank Owned Life Insurance	0	0
Demand deposits and savings	0	0
Time deposits	0	0
Short-term Debt	0	0
Long-term debt	0	0
Interest Payable	0	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0	0
Derivative Liability	0	0
Interest Rate Swap | Not Designated as Hedging Instrument | Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	1,050	723
Interest Rate Swap | Not Designated as Hedging Instrument | Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	1,050	723
Interest Rate Swap | Fair Value, Inputs, Level 1 | Not Designated as Hedging Instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	0	0
Interest Rate Swap | Fair Value, Inputs, Level 2 | Not Designated as Hedging Instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	1,050	723
Interest Rate Swap | Fair Value, Inputs, Level 3 | Not Designated as Hedging Instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	$0	$0

Commitments_and_Contingencies_1

Commitments and Contingencies - Schedule of Fair Value Off Balance Sheet Risks (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
Commitments under unfunded loans and lines of credit	$699,641	$663,137
Letters of credit	7,519	6,607
Unused credit card lines	$4,361	$4,512

Commitments_and_Contingencies_2

Commitments and Contingencies - Narrative (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
Commitment to Purchase Limited Partnership Interest	$8.80
Unfunded Commitment to Purchase Limited Partnership Interest	$5.60	$5.60

Employee_Benefits_Disclosure_o

Employee Benefits - Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award (Details) (Employee Stock Option, USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	337,778
Exercised (in shares)	156,125
Forfeited or expired (in shares)	0
Outstanding, end of period (in shares)	181,653
Exercisable at December 31, 2013 (in shares)	180,229
Share options expected to vest (in shares)	1,424
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, beginning of period (in shares)	$11.37
Exercised (in shares)	$12.22
Forfeited or expired (in shares)	$0
Outstanding, end of period (in shares)	$10.63
Exercisable at December 31, 2013 (in shares)	$10.64
Share options expected to vest (in shares)	$9.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted average remaining contractual term (dollars per shares)	2 years 8 months 26 days
Exercisable at December 31, 2013 (dollars per share)	2 years 8 months 19 days
Share options expected to vest (dollars per share)	5 years 0 months 11 days
Aggregate intrinsic value	$1,356
Exercisable at December 31, 2013	1,344
Share options expected to vest	$12

Employee_Benefits_Schedule_of_

Employee Benefits - Schedule of Nonvested Restricted Stock Units Activity (Details) (Restricted Stock, USD $)	3 Months Ended
	Mar. 31, 2015
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock nonvested, beginning of period (in shares)	601,268
Granted (in shares)	2,000
Vested (in shares)	-17,963
Forfeited (in shares)	-3,334
Restricted stock nonvested, end of period (in shares)	581,971
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Restricted stock nonvested, beginning of period (dollars per share)	$14.90
Granted (dollars per share)	$16.70
Vested (dollars per share)	$16.20
Forfeited (dollars per share)	$10.87
Restricted stock nonvested, end of period (dollars per share)	$14.89

Employee_Benefits_Narrative_De

Employee Benefits - Narrative (Details) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Grants in Period, Gross	0
Fair value of restricted stock, vested in period	$0.30	$0.20
2006 Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Rights issued	173,683
2013 Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Options (in shares)	443,981
Shares available	972,007
KeySource Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Options (in shares)	145,660
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Options (in shares)	181,653		337,778
Compensation Cost Not yet Recognized, Period for Recognition	1 month 10 days
Employee Stock Option | KeySource Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available	35,607
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Cost Not yet Recognized, Period for Recognition	2 years 5 months 5 days
Allocated Share-based Compensation Expense	0.7	0.5
Compensation Cost Not yet Recognized	$7