BNC Bancorp (BNNC) 10-K 27 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Feb. 24, 2015	Jun. 30, 2014
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-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		32,693,214
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$479.10

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets
Cash and due from banks	$44,659	$35,474
Interest-earning deposits in other banks	40,535	72,916
Investment securities available-for-sale, at fair value	269,290	270,417
Investment securities held-to-maturity, at amortized cost (fair value of $241,997 and $236,507 at December 31, 2014 and 2013, respectively)	237,092	247,378
Federal Home Loan Bank stock, at cost	10,562	10,720
Loans held for sale	37,280	30,899
Loans:
Originated loans	2,116,441	1,704,876
Acquired loans	958,657	571,641
Less allowance for loan losses	-30,399	-32,875
Net loans	3,044,699	2,243,642
Accrued interest receivable	14,514	12,955
Premises and equipment, net	87,761	76,126
Other real estate owned	42,531	47,606
FDIC indemnification asset	5,097	16,886
Investment in bank-owned life insurance	93,396	78,439
Goodwill and other intangible assets, net	83,701	34,966
Other assets	61,391	51,152
Total assets	4,072,508	3,229,576
Deposits:
Non-interest bearing demand	534,792	324,532
Interest-bearing demand	1,657,931	1,299,399
Time deposits	1,203,674	1,082,799
Total deposits	3,396,397	2,706,730
Short-term borrowings	127,934	125,592
Long-term debt	133,814	101,509
Accrued expenses and other liabilities	23,975	24,415
Total liabilities	3,682,120	2,958,246
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, no par value; authorized 60,000,000 shares; 27,777,737 and 21,310,832 shares issued and outstanding at December 31, 2014 and 2013, respectively	281,488	181,684
Common stock, non-voting, no par value; authorized 20,000,000 shares; 4,820,844 and 5,992,213 shares issued and outstanding at December 31, 2014 and 2013, respectively	33,507	44,781
Retained earnings	65,211	41,559
Stock in directors rabbi trust	-3,429	-3,143
Directors deferred fees obligation	3,429	3,143
Accumulated other comprehensive income	10,182	3,306
Total shareholders' equity	390,388	271,330
Total liabilities and shareholders' equity	$4,072,508	$3,229,576

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Held-to-maturity Securities, Fair Value	$241,997	$236,507
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	27,777,737	21,310,832
Common Stock, Shares, Outstanding	27,777,737	21,310,832
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	5,992,213
Common Stock, Shares, Outstanding	4,820,844	5,992,213

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income:
Loans, including fees	$140,024	$121,704	$98,668
Investment securities:
Taxable	4,385	4,366	4,808
Tax-exempt	13,191	12,202	9,749
Interest-earning balances and other	542	398	290
Total interest income	158,142	138,670	113,515
Interest expense:
Demand deposits	5,859	15,282	14,508
Time deposits	9,280	10,898	15,093
Short-term borrowings	416	433	338
Long-term debt	4,371	3,450	2,952
Total interest expense	19,926	30,063	32,891
Net interest income	138,216	108,607	80,624
Provision for loan losses	7,006	12,188	22,737
Net interest income after provision for loan losses	131,210	96,419	57,887
Non-interest income:
Mortgage fees	7,689	8,979	6,169
Service charges	6,105	4,314	3,149
Earnings on bank-owned life insurance	2,382	2,318	1,771
Gain (loss) on sale of investment securities, net	-511	-42	3,026
Bargain purchase gain on acquisition	0	0	12,706
Other	9,357	7,237	6,317
Total non-interest income	25,022	22,806	33,138
Non-interest expense:
Salaries and employee benefits	62,232	52,994	42,200
Occupancy	9,153	6,547	4,965
Furniture and equipment	6,450	5,546	4,241
Data processing and supplies	4,007	3,275	2,773
Advertising and business development	2,666	2,020	1,761
Insurance, professional and other services	9,061	8,392	6,685
FDIC insurance assessments	2,932	2,766	2,166
Loan, foreclosure and other real estate owned expenses	8,945	8,949	10,944
Other	11,031	7,444	6,537
Total non-interest expense	116,477	97,933	82,272
Income before income tax expense (benefit)	39,755	21,292	8,753
Income tax expense (benefit)	10,365	4,045	-1,700
Net income	29,390	17,247	10,453
Less preferred stock dividends and discount accretion	0	1,060	2,404
Net income available to common shareholders	$29,390	$16,187	$8,049
Earnings Per Share [Abstract]
Basic (USD per share)	$1.01	$0.61	$0.48
Diluted (USD per share)	$1.01	$0.61	$0.48
Dividends Declared and Paid (USD per share)	$0.20	$0.20	$0.20

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$29,390	$17,247	$10,453
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]
Unrealized holding gains (losses) on investments securities available-for-sale	13,831	-15,586	3,408
Tax effect	-5,118	5,961	-1,314
Reclassification of (gains) losses recognized in net income	511	42	-3,026
Tax effect	-189	-16	1,167
Amortization of unrealized gains on investment securities transferred from available-for-sale to held-to-maturity	-829	-623	-538
Tax effect	307	334	207
Net of tax amount	8,513	-9,888	-96
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Unrealized holding gains (losses)	-3,053	2,704	-593
Tax effect	1,130	-1,042	229
Reclassification of losses recognized in net income	457	9,863	7,940
Tax effect	-171	-3,760	-3,061
Net of tax amount	-1,637	7,765	4,515
Total other comprehensive income (loss)	6,876	-2,123	4,419
Total comprehensive income	$36,266	$15,124	$14,872

Consolidated_Statements_of_Sha

Consolidated Statements of Shareholders' Equity (USD $)	Total	First Trust [Member]	Randolph Bank and Trust	South Street Financial Corporation	Community First Financial Group, Inc	Harbor Bank Group, Inc	Common stock	Common stock	Common stock	Common stock	Common stock	Common stock	Common stock	Warrant [Member]	Preferred Stock	Preferred Stock	Preferred Stock	Preferred Stock	Retained earnings	Stock in directors rabbi trust	Directors deferred fees obligation	Accumulated other comprehensive income
In Thousands, except Share data, unless otherwise specified								KeySource [Member]	Randolph Bank and Trust	South Street Financial Corporation	Community First Financial Group, Inc	Harbor Bank Group, Inc	Common stock - nonvoting		Preferred stock Series A	Preferred stock Series B	Preferred Stock Series B-1 [Member]	Series C Preferred Stock [Member]
Beginning Balance, Value at Dec. 31, 2011	$163,855						$87,421						$0	$2,412	$30,237	$17,161			$25,614	($2,505)	$2,505	$1,010
Beginning Balance Shares at Dec. 31, 2011							9,100,890						0
Net income	10,453																		10,453
Directors deferred fees	0																			585	-585
Other comprehensive loss, net of tax	4,419																					4,419
Stock Issued For Acquisitions		3,276,101						1,810,267
Stock Issued During Period, Value, Acquisitions		26,177						13,942
Common Stock Issued Pursuant To [Abstract]
Stock-based Compensation, Shares							48,098
Stock-Based Compensation, Value	529						529
Exercised (in shares)							48,092
Stock Issued During Period, Value, Stock Options Exercised	286						286
Shares Traded to Exercise Options Shares							-19,189
Shares Traded to Exercise Options Value	-148						-148
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	17						17
Dividend Reinvestment Plan, Shares							29,443
Dividend Reinvestment Plan, Values	225						225
Stock Issued During Period, Shares, Conversion of Convertible Securities							-6,168,965						-4,187,647
Stock Issued During Period, Value, Conversion of Convertible Securities							-40,688						-27,620				-27,620	-40,688
Cash Dividends:
Common Stock, Cash Dividend Per Share	-2,955																		-2,955
Preferred Stock, Net of Accretion	-1,924														480				-2,404
Stock Issued During Period, Value, New Issues	68,308																27,620	40,688
CancellationOfCommonStockWarrant	-940						1,472							-2,412
Ending Balance, Value at Dec. 31, 2012	282,244						170,609						27,620	0	30,717	17,161			30,708	-3,090	3,090	5,429
Ending Balance, Shares at Dec. 31, 2012							20,462,667						4,187,647
Net income	17,247																		17,247
Directors deferred fees	0																			53	-53
Other comprehensive loss, net of tax	-2,123																					-2,123
Stock Issued For Acquisitions									726,634
Stock Issued During Period, Value, Acquisitions			9,642						9,642
Stock Redeemed or Called During Period, Value	-31,260														-31,260
Common Stock Issued Pursuant To [Abstract]
Stock-based Compensation, Shares							98,334
Stock-Based Compensation, Value	1,173						1,173
Dividend Reinvestment Plan, Shares							23,197
Dividend Reinvestment Plan, Values	260						260
Stock Issued During Period, Shares, Conversion of Convertible Securities													-1,804,566
Stock Issued During Period, Value, Conversion of Convertible Securities	0												-17,161			17,161
Cash Dividends:
Common Stock, Cash Dividend Per Share	-5,336																		-5,336
Preferred Stock, Net of Accretion	-517														543				-1,060
Ending Balance, Value at Dec. 31, 2013	271,330						181,684						44,781	0	0	0			41,559	-3,143	3,143	3,306
Ending Balance, Shares at Dec. 31, 2013							21,310,832						5,992,213
Net income	29,390																		29,390
Directors deferred fees	0																			-286	286
Other comprehensive loss, net of tax	6,876																					6,876
Stock Issued For Acquisitions										1,139,931	1,190,763	3,082,714
Stock Issued During Period, Value, Acquisitions				19,778	20,128	51,003				19,778	20,128	51,003
Common Stock Issued Pursuant To [Abstract]
Stock-based Compensation, Shares							160,781
Stock-Based Compensation, Value	2,174						2,174
Stock Repurchased and Retired During Period, Shares							-35,676
Adjustments Related to Tax Withholding for Share-based Compensation	-597						-597
Exercised (in shares)							74,559
Stock Issued During Period, Value, Stock Options Exercised	836						836
Shares Traded to Exercise Options Shares							-37,158
Shares Traded to Exercise Options Value	-663						-663
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	615						615
Dividend Reinvestment Plan, Shares							19,622
Dividend Reinvestment Plan, Values	336						336
Conversion of Stock, Shares Issued							871,369						-871,369
Conversion of Stock, Amount Issued							6,194						-6,194
Treasury Stock, Shares, Acquired													-300,000
Treasury Stock, Value, Acquired, Cost Method	-5,080												-5,080
Cash Dividends:
Common Stock, Cash Dividend Per Share	-5,738																		-5,738
Ending Balance, Value at Dec. 31, 2014	$390,388						$281,488						$33,507	$0	$0	$0			$65,211	($3,429)	$3,429	$10,182
Ending Balance, Shares at Dec. 31, 2014							27,777,737						4,820,844

Consolidated_Statements_of_Sha1

Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Cash Paid	$0.20	$0.20	$0.20

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities
Net income	$29,390	$17,247	$10,453
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	7,006	12,188	22,737
Depreciation and amortization	6,158	4,615	2,987
Amortization of premiums, net	4,280	4,483	1,436
Amortization of intangible assets	2,340	1,176	567
Deferred income tax provision (benefit)	-51	3,805	-1,910
Accretion of fair value purchase accounting adjustments	-12,273	-16,396	-8,515
Acquisition-related gain	0	719	12,706
Cash flow hedge expense	163	9,863	7,940
Stock-based compensation	2,174	1,173	529
Deferred compensation	424	333	605
Earnings on bank-owned life insurance	-2,382	-2,318	-1,771
Loss on sale of investment securities, net	511	42	-3,026
(Gain) loss on disposal of premises and equipment	-31	109	183
Losses on other real estate owned	4,329	3,173	6,503
Gain on sale of loans (mortgage fees)	-7,689	-8,979	-6,169
Origination of loans held for sale	-286,855	-334,325	-274,925
Proceeds from sales of loans held for sale	292,497	352,130	233,276
(Increase) decrease in accrued interest receivable	112	-792	1,048
Payments received from FDIC under loss-share agreements	9,930	34,576	60,216
(Increase) decrease in other assets	2,279	86,326	-477
Increase (decrease) in accrued expenses and other liabilities	-11,833	-4,797	553
Net cash provided by operating activities	40,479	162,913	39,534
Investing activities
Purchases of investment securities available-for-sale	-33,008	-97,101	-92,713
Purchases of investment securities held-to-maturity	-5,269	-49,387	-18,693
Proceeds from sales of investment securities available-for-sale	40,647	18,414	117,381
Proceeds from sales of investment securities held-to-maturity	8,651	0	0
Proceeds from maturities and payments of investment securities available-for-sale	39,138	49,787	46,386
Proceeds from maturities and payments of investment securities held-to-maturity	4,175	1,313	0
Redemption (purchase) of Federal Home Loan Bank stock	2,605	-2,486	2,850
Net increase in loans	-211,120	-99,199	-44,335
Purchases of premises and equipment	-4,402	-8,591	-12,221
Proceeds from disposal of premises and equipment	55	47	283
Investment in bank-owned life insurance	-248	-502	-12,081
Investment in other real estate owned	-1,422	-2,190	-2,339
Proceeds from sales of other real estate owned	32,870	32,805	51,353
Net cash received from acquisitions	80,251	14,207	113,466
Net cash provided by (used in) investing activities	-47,077	-142,883	149,337
Financing activities
Net increase (decrease) in deposits	6,691	-208,854	-15,386
Net increase (decrease) in short-term borrowings	-70,713	76,210	-46,508
Net increase (decrease) in long-term-debt	58,332	23,786	-11,587
Preferred stock issued (redeemed), net	0	-31,260	68,308
Common stock issued from exercise of stock options	173	0	138
Common stock issued pursuant to dividend reinvestment plan	336	260	225
Common stock repurchased	-5,081	0	0
Redemption of common stock warrant	0	0	-940
Common stock repurchased in lieu of income taxes	-598	0	0
Cash dividends paid, net of accretion	-5,738	-5,853	-4,879
Net cash used in financing activities	-16,598	-145,711	-10,629
Net increase (decrease) in cash and cash equivalents	-23,196	-125,681	178,242
Cash and cash equivalents, beginning of year	108,390	234,071	55,829
Cash and cash equivalents, end of year	85,194	108,390	234,071
Supplemental Statement of Cash Flows Disclosure
Interest paid	19,349	30,786	32,113
Income taxes paid	5,547	1,692	1,549
Summary of Noncash Investing and Financing Activities
Transfer of loans to other real estate owned	24,015	27,105	38,569
Transfer of loans held for sale to loans	15,112	20	0
FDIC indemnification asset increase (decrease) for losses, net	-233	4,051	31,793
Transfer of securities from available-to-sale to held-to-maturity	$0	$86,526	$0

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Organization
	BNC Bancorp (the “Parent Company”) is a bank holding company for Bank of North Carolina (“BNC”), a wholly owned subsidiary, headquartered in High Point, North Carolina. The Parent Company also maintains four wholly-owned special-purpose subsidiary trusts that issue trust preferred securities. The information in the consolidated financial statements relates primarily to BNC. 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 Parent 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 Parent Company and BNC are examined periodically by those regulatory authorities.
	Basis of Presentation
	The accompanying consolidated financial statements include the accounts and transactions of the Parent Company and BNC, collectively referred to herein as the “Company.” All significant intercompany transactions and balances have been eliminated in consolidation.
	Use of Estimates
	The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“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.
	Reclassifications
	Certain amounts in the 2013 consolidated financial statements have been reclassified to conform to the 2014 presentation. The reclassifications had no effect on net income, net income available to common shareholders or shareholders' equity as previously reported.
	Business Combinations
	The Company accounts for its business combinations using the acquisition method of accounting. This method requires the use of fair values in determining the carrying values of the purchased assets and assumed liabilities, which are recorded at fair value at acquisition date, and identifiable intangible assets are recorded at fair value. Costs directly related to the business combinations are recorded as expenses as they are incurred. Fair values are subject to refinement for up to one year after the closing date of an acquisition as information relative to closing date fair values become available.
	Cash and Cash Equivalents
	For the purpose of presentation in the statements of cash flows, cash and cash equivalents include cash and due from banks and interest-earning deposits in other banks.
	Federal regulations require financial institutions to set aside a specified amount as a reserve against transaction accounts and time deposits. At December 31, 2014 and 2013, the Company’s reserve requirement was $12.1 million and $8.4 million, respectively.
	Investment Securities
	Investment securities are classified into one of three categories on the date of purchase and accounted for as follows: (1) debt securities that the Company has the positive intent and the ability to hold to maturity are classified as held-to-maturity and reported at amortized cost; (2) debt and equity securities that are bought and held principally for the purpose of selling them in the near term are classified as trading securities and reported at fair value, with unrealized gains and losses included in earnings; and (3) debt and equity securities not classified as either held-to-maturity securities or trading securities are classified as available-for-sale securities and reported at fair value, with unrealized gains and losses, net of taxes, reported as other comprehensive income.
	Premiums are amortized and discounts accreted using the interest method over the remaining terms of the related securities. Dividend and interest income are recognized when earned. Sales of investment securities are recorded at trade date, with realized gains and losses on sales determined using the specific identification method and included in non-interest income.
	Transfers of investment securities into the held-to-maturity category from the available-for-sale category are made at fair value at the date of transfer. The unrealized holding gain or loss at the date of transfer is retained in accumulated other comprehensive income and in the carrying value of the held-to-maturity securities. Such amounts are amortized over the remaining life of the security.
	Our investment securities portfolio includes residential mortgage-backed securities and collateralized mortgage obligations. As the underlying collateral of each of these securities is comprised of a large number of similar residential mortgage loans for which prepayments are probable and the timing and amount of such prepayments can be reasonably estimated, we consider estimates of future principal prepayments of these underlying residential mortgage loans in the calculation of the constant effective yield used to apply the interest method for income recognition.
	The Company evaluates securities for other-than-temporary impairment ("OTTI") on at least a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. For securities in an unrealized loss position,the Company considers the extent and duration of the unrealized loss, and the financial condition and near-term prospects of the issuer. The Company also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in the income statement and 2) other-than-temporary impairment (OTTI) related to other factors, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis. For equity securities, the entire amount of impairment is recognized through earnings.
	Federal Home Loan Bank Stock
	As a member of the Federal Home Loan Bank of Atlanta (the "FHLB"), the Company is required to maintain an investment in the stock of the FHLB based upon the amount of outstanding FHLB borrowings. This stock does not have a readily determinable fair value and is carried at cost.
	Loans and Leases
	Originated Loans and Leases
	Loans that management has the intent and ability to hold for the foreseeable future or until maturity are reported at their outstanding principal balances, adjusted for any charge-offs, unearned discounts, and unamortized fees and costs on originated loans. Interest income on loans is accrued and credited to income based upon the principal amount outstanding. The net amount of nonrefundable loan origination fees and certain direct costs associated with the lending process are deferred and amortized to interest income over the contractual lives of the loans using methods that approximate the interest method.
	The Company classifies all loans and leases past due when the payment of principal and/or interest based upon contractual terms is greater than 30 days delinquent. When commercial loans are placed on nonaccrual status as described below, a charge-off is recorded, as applicable, to decrease the carrying value of such loans to the estimated fair value of the collateral securing the loan. Consumer loans are placed on nonaccrual status at a specified delinquency date consistent with regulatory guidelines. As such, consumer loans are subject to collateral valuation and charge-off, as applicable, when they are moved to nonaccrual status. The accrual of interest income for commercial loans is discontinued when there is a clear indication that the borrower’s cash flow may not be sufficient to meet payments as they become due, while the accrual of interest income for consumer loans is discontinued when loans reach specific delinquency levels.
	Acquired Loans
	Acquired loans are recorded at their fair value at the acquisition date. Credit discounts are included in the determination of fair value; therefore, an allowance for loan losses is not recorded at the acquisition date. Loans acquired in FDIC-assisted transactions and covered under loss-share agreements are referred to as “covered loans.”
	Acquired loans are evaluated upon acquisition and classified as either purchased impaired or purchased non-impaired. Purchased impaired loans reflect credit deterioration since origination such that it is probable at acquisition that the Company will be unable to collect all contractually required payments. For purchased impaired loans, expected cash flows at the acquisition date in excess of the fair value of loans are recorded as interest income over the life of the loans using a level yield method if the timing and amount of the future cash flows is reasonably estimable. Subsequent to the acquisition date, increases in cash flows over those expected at the acquisition date are recognized prospectively as interest income. Decreases in expected cash flows after the acquisition date are recognized immediately through the provision for loan losses. For purchased non-impaired loans, the difference between the fair value and unpaid principal balance of the loan at the acquisition date is amortized or accreted to interest income over the economic life of the loans using a method that approximates the interest method.
	Covered loans acquired will be reimbursed for a substantial portion of any future losses on them under the terms of the FDIC loss-share agreements. The covered loans are reported in loans exclusive of the expected reimbursement from the FDIC. Covered loans are initially recorded at fair value at the acquisition date. The covered loans are and will be subject to the Company’s internal and external credit review and monitoring. Prospective losses incurred on covered loans are eligible for partial reimbursement by the FDIC. Subsequent decreases in the amount expected to be collected result in a provision for loan losses, an increase in the allowance for loan losses, and a proportional increase to the FDIC indemnification asset for the estimated amount to be reimbursed. Subsequent increases in the amount expected to be collected result in the reversal of any previously-recorded provision for loan losses and related allowance for loan losses and decreases to the FDIC indemnification asset, or accretion of certain fair value amounts into interest income in future periods if no provision for loan losses had been recorded.
	Loans Held for Sale
	The Company originates certain single family, residential first mortgage loans for sale on a presold basis and these loans are classified as loans held for sale. Loans held for sale are carried at the lower of cost or estimated fair value in the aggregate as determined by outstanding commitments from investors. Upon closing, these loans, together with their servicing rights, are sold to other financial institutions under prearranged terms on a best-efforts basis. Gains or losses on loan sales are recognized at the time of sale and are determined by the difference between net sales proceeds and the principal balance of the loans sold, adjusted for net deferred loan fees or costs. Loan origination and commitment fees, net of certain direct loan origination costs, are deferred as an adjustment to the carrying value of the loan until it is sold. The commitments to sell loans and the commitments to originate loans held for sale at a set interest rate, if originated, are considered derivatives under GAAP. The impact of the estimated fair value adjustment was not significant to the consolidated financial statements.
	Nonperforming Loans
	The Company considers a loan impaired, based on current information and events, if it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. All impaired loans are measured based on the present value of the expected future cash flows discounted at the loan's effective interest rate, the loan's observable market price, or at the fair value of the collateral if the loan is collateral dependent.
	The Company uses several factors in determining if a loan is impaired. Internal asset classification procedures include a thorough review of significant loans and lending relationships and include the accumulation of related data. This data includes loan payment status and the borrowers' financial data, cash flows, operating income or loss, and other factors. These discounted cash flow analyses incorporate adjustments to future cash flows that reflect management’s best estimate based on a combination of historical experience and management judgment.
	Loans are generally classified as nonaccrual if they are past due as to maturity or payment of principal or interest for a period of more than ninety (90) days, unless such loans are well-secured and in the process of collection. If a loan or a portion of a loan is classified as doubtful or is partially charged off, the loan is generally classified as nonaccrual. Loans that are on a current payment status or past due less than ninety (90) days may also be classified as nonaccrual if repayment in full of principal and/or interest is in doubt.
	Loans may be returned to accrual status when all principal and interest amounts contractually due (including arrearages) are reasonably assured of repayment within an acceptable period of time and there is a sustained period of repayment performance (generally, a minimum of six months) by the borrower in accordance with the contractual terms of interest and principal.
	While a loan is classified as nonaccrual and the future collectability of the recorded loan balance is doubtful, collections of interest and principal are generally applied as a reduction to principal outstanding. When future collection of the recorded loan balance is expected, interest income may be recognized on a cash basis. In the case where a nonaccrual loan had been partially charged off, recognition of interest on a cash basis is limited to that which would have been recognized on the recorded loan balance at the contractual interest rate. Receipts in excess of that amount are recorded as recoveries to the allowance for loan losses until prior charge-offs have been fully recovered.
	Restructurings
	Modifications to a borrower’s debt agreement are considered troubled debt restructurings (“TDRs”) if a concession is granted for economic or legal reasons related to a borrower’s financial difficulties that otherwise would not be considered. TDRs are undertaken in order to improve the likelihood of recovery on the loan and may take the form of modifications made with the stated interest rate lower than the current market rate for new debt with similar risk, modifications to the terms and conditions of the loan that fall outside of normal underwriting policies and procedures, or a combination of these modifications. Modifications of covered and other acquired loans that are part of a pool accounted for as a single asset are not considered TDRs. TDRs can involve loans remaining on nonaccrual, moving to nonaccrual, or continuing on accruing status, depending on the individual facts and circumstances of the borrower.
	Allowance for Loan and Lease Losses
	The allowance for loan losses is established through a provision for loan losses charged to expense. Loans are charged-off against the allowance when management believes that the collectability of principal is unlikely. Recoveries of amounts previously charged-off are credited to the allowance. The allowance is an amount that management believes will be adequate to absorb probable losses on existing loans based on evaluations of the collectibility of loans. The evaluations take into consideration such factors as changes in the nature and volume of the loan portfolio, overall portfolio quality, historical loan losses, review of specific loans for impairment, and current economic conditions and trends that may affect the borrowers' ability to pay. Accrual of interest is discontinued on loans when management believes, after considering economic and business conditions and collection efforts and the value of the underlying collateral, that the borrowers' financial condition is such that collection is doubtful.
	In addition, various regulatory agencies, as an integral part of their examination process, periodically review BNC’s allowance for loan losses. Such agencies may require BNC to recognize adjustments to the allowance based on their judgments of information available to them at the time of their examination.
	Accounting standards require the presentation of certain disclosure information at the portfolio segment level, which represents the level at which an entity develops and documents a systematic methodology to determine its allowance for loan losses. The Company concluded that its loan and lease portfolio comprises two portfolio segments; originated loans (which include purchased non-credit impaired loans) and purchased credit impaired loans. Originated loans include both commercial loans, which include commercial real estate, commercial construction, commercial and industrial and leases, and retail loans, which include residential construction, residential mortgage and consumer and other loans. The following provides a description of the Company’s accounting policies and methodologies related to each of its portfolio segments:
	Originated Loans
	All commercial and retail loans that are originated by the Company are assigned risk grades based on an assessment of conditions that affect the borrower’s ability to meet contractual obligations under the loan agreement. This process includes reviewing borrowers’ financial information, historical payment experience, credit documentation, public information, and other information specific to each borrower. Loans with outstanding balance of $1 million or more, as well as all other loans included in such relationships, are reviewed on an annual basis. Loans with total committed exposure of $250,000 or more that are risk graded as Special Mention or worse, as well as credit relationships with total credit exposure of $500,000 or more that are risk graded Special Mention or worse, are reviewed on a quarterly basis. All other loans are reviewed at any point management becomes aware of information affecting the borrower’s ability to fulfill their obligations. The Company calculates a specific reserve for each loan that has been deemed impaired, which include commercial loans 90 days or more past due, commercial nonaccrual loans above $250,000, and commercial and retail restructurings above $250,000. The amount of the reserve is based on the present value of expected cash flows discounted at the loan’s effective interest rate, and/or the value of collateral. If foreclosure is probable or the loan is collateral dependent, impairment is measured using the fair value of the loan’s collateral, less estimated costs to sell.
	As part of the Company’s ongoing assessment of the adequacy of the allowance for loan and lease losses, during the fourth quarter of 2014 the Company enhanced the methodology used in calculating the collective impairment reserve for homogeneous pools of non-impaired loans as of the balance sheet date, as well as impaired loans below the parameters described above. This enhancement included the incorporation of a detailed loss migration analysis using historical loss experience of 60 months, and changing the assumptions used in calculating loss reserve rates from two-year historical charge-offs to using probability of default, which is estimated based on the enhanced migration analysis, and loss-given default, which is based on historical net charge-off experience for each class of financing receivable during the loss experience period. Probability of default is based on risk grades for commercial loans and based on days past due for residential real estate and consumer loans. The Company also made changes to the qualitative factors used to provide a more objective and consistent result from quarter to quarter. The factors evaluated were not changed significantly but the manner in which the reserve is assigned is determined by objective evaluation of those factors and the number of those improving and declining. The enhancements did not have a material impact on the calculation of the allowance for loan and leases losses at December 31, 2014.
	For acquired loans that are not deemed credit impaired at acquisition, credit discounts representing the principal losses expected over the life of the loan are a component of the initial fair value. Subsequent to the purchase date, the methods utilized to estimate the required allowance for loan losses for these loans is similar to originated loans, however, the Company records a provision for loan losses only when the required allowance, net of any expected reimbursement under any loss-share agreements, exceeds any remaining credit discounts. The remaining differences between the purchase price and the unpaid principal balance at the date of acquisition are recorded in interest income over the economic life of the loans.
	Purchased Credit Impaired Loans
	The allowance for loan and lease losses related to purchased credit impaired loans is based on an analysis that is performed each period to estimate the expected cash flows for each of the loan pools. To the extent that the expected cash flows of a loan pool have decreased since the acquisition date, the Company establishes an allowance for loan losses.
	Other Real Estate Owned
	Other real estate owned (“OREO”) acquired through, or in lieu of, loan foreclosure is held for sale and is initially recorded at estimated fair value less cost of disposal at the date of foreclosure, establishing a new cost basis. When property is acquired, the excess, if any, of the loan balance over estimated fair value is charged to the allowance for loan losses. Subsequent to foreclosure, valuations are periodically performed by management and the assets are carried at the lower of carrying amount or fair value less cost to sell. Revenue and expenses from operations and changes in the valuation allowance are included in loan, foreclosure and other real estate owned expenses as a component of non-interest expense.
	FDIC Indemnification Asset
	The FDIC indemnification asset is measured separately from the related covered assets as it is not contractually embedded in the assets and is not transferable with the assets should the Company choose to dispose of them. At acquisition date of an FDIC-assisted transaction, fair value is estimated using projected cash flows related to the loss-share agreements based on the expected reimbursements for losses and the applicable loss-sharing percentages and the estimated true-up payment at the expiration of the loss-share agreements, if applicable. These cash flows were discounted to reflect the estimated timing of the receipt of the loss-share reimbursement from the FDIC and the true-up payment to the FDIC. Cash flow projections resulting from the loss-share agreements are reviewed and updated prospectively as loss estimates related to both covered loans and covered other real estate owned change, including the existence of and amount of any required true-up payment owed to the FDIC.
	Premises and Equipment
	Premises and equipment are stated at cost less accumulated depreciation and amortization. Land is carried at cost. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the respective assets, which are 40 years for buildings and 3 to 10 years for furniture, fixtures and equipment. Leasehold improvements are amortized over the terms of the respective leases or the estimated useful lives of the improvements, whichever is shorter. Repairs and maintenance costs are charged to operations as incurred.
	Bank-Owned Life Insurance
	The Company has purchased life insurance policies on certain current and past key employees and directors where the insurance policy benefits and ownership are retained by the employer. These policies are recorded at their cash surrender value. Income from these policies and changes in the net cash surrender value are recorded in non-interest income as earnings on bank-owned life insurance. The cash value accumulation is permanently tax deferred if the policy is held to the insured person’s death and certain other conditions are met.
	Goodwill and Other Intangible Assets
	Goodwill represents the excess of the purchase price over the fair value of net assets acquired in a business combination. Goodwill and intangible assets acquired in a purchase business combination and determined to have an indefinite useful life are not amortized, but tested for impairment at least annually or more frequently if events and circumstances exists that indicate that a goodwill impairment test should be performed. The Company has selected June 30 as the date to perform the annual impairment test. Intangible assets with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Goodwill is the only intangible asset with an indefinite life on our consolidated balance sheets.
	Other intangible assets consist of core deposit and acquired customer relationship intangible assets arising from whole bank and branch acquisitions are amortized on an accelerated method over their estimated useful lives, which range from seven to 10 years .
	Derivatives
	The Company applies hedge accounting to certain interest rate derivatives entered into for risk management purposes. To qualify for hedge accounting, a derivative must be highly effective at reducing the risk associated with the exposure being hedged. In addition, key aspects of achieving hedge accounting are documentation of hedging strategy and hedge effectiveness at the hedge inception and substantiating hedge effectiveness on an ongoing basis. A derivative must be highly effective in accomplishing the hedge objective of offsetting changes in the cash flows of the hedged item for the risk being hedged. Any ineffectiveness in the hedge relationship is recognized in earnings. The effective portion of changes in the fair value of derivatives designated in a hedge relationship and that qualify as cash flow hedges is recorded in accumulated other comprehensive income, net of tax, and is subsequently reclassified into earnings in the period that the hedged transaction affects earnings.
The Company formally documents the relationship between derivatives and hedged items, as well as the risk-management objective and the strategy for undertaking hedge transactions at the inception of the hedging relationship. This documentation includes linking cash flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used are highly effective in offsetting changes in fair values or cash flows of the hedged items. The Company discontinues hedge accounting when it determines that the derivative is no longer effective in offsetting changes in the fair value or cash flows of the hedged item, the derivative is settled or terminates, a hedged forecasted transaction is no longer probable, a hedged firm commitment is no longer firm, or treatment of the derivative as a hedge is no longer appropriate or intended.
When hedge accounting is discontinued, subsequent changes in fair value of the derivative are recorded as non-interest income. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transactions are still expected to occur, gains or losses that were accumulated in other comprehensive income are amortized into earnings over the same periods which the hedged transactions will affect earnings.
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 are excluded from the computation of dilutive earnings per share in the periods in which the effect would be anti-dilutive.
Income Taxes
Deferred income taxes are recognized for the tax consequences of temporary differences between financial statement carrying amounts and the tax bases of existing assets and liabilities that will result in taxable or deductible amounts in future years. These temporary differences are multiplied by the enacted income tax rate expected to be in effect when the taxes become payable or receivable. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date. Deferred tax assets are reduced, if necessary, by the amount of such benefits that are not expected to be realized based on available evidence.
Operating Segments
The Company’s operations are managed along two operating segments, consisting of banking operations and mortgage origination. While the chief operating decision maker uses financial information related to these segments to analyze business performance and allocate resources, the mortgage origination segment does not meet the quantitative threshold under GAAP to be considered a reportable segment. As such, these operating segments are aggregated into a single reportable operating segment in the Consolidated Financial Statements. No revenues are derived from foreign countries or from external customers that comprise more than 10% of the Company’s revenues.
Stock Compensation Plans
The Company follows the provisions of the authoritative guidance regarding share-based compensation. This guidance values share-based awards at the grant date fair value and recognizes the expense over the requisite service period.
Recently Adopted and Issued Accounting Standards
In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“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 Company does not expect the adoption of this ASU to have a material impact on its consolidated financial statements.
In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, to provide guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists thereby reducing diversity in practice. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. Early adoption is permitted. The amendments are to be applied prospectively to all unrecognized tax benefits that exist at the effective date with retrospective application permitted. The adoption of this ASU did not have a material impact on the Company's consolidated financial statements.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2014
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 (dollars in thousands):
	Assets	As Recorded by Harbor			Fair				As Recorded
					Value Adjustments				by BNC
	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 (dollars in thousands):
	Assets	As Recorded by			Fair				As Recorded
		Community First			Value Adjustments				by BNC
	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 (dollars in thousands):
Assets	As Recorded by			Fair				As Recorded
	South Street			Value Adjustments				by BNC
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 $8.2 million during the year ended December 31, 2014 related to these acquisitions, which were expensed as incurred as a component of non-interest expense. Transaction-related costs primarily include severance costs, professional services, data processing fees, marketing and advertising and other non-interest expenses.
The following table presents financial information regarding the former Harbor, Community First and South Street operations included in our Consolidated Statements of Income from the date of acquisition through December 31, 2014 under the column “Actual from acquisition date through December 31, 2014”. These amounts do not include direct costs as explained above. In addition, the following table presents unaudited pro forma information as if the acquisitions of Harbor, Community First and South Street had occurred on January 1, 2013 under the “Pro forma” columns. This pro forma information gives effect to certain adjustments, including purchase accounting fair value adjustments, amortization of core deposit and other intangibles and related income tax effects and is based on our historical results for the periods presented. Transaction-related costs related to the acquisition are not reflected in the pro forma amounts. The pro forma information does not necessarily reflect the results of operations that would have occurred had the Company acquired Harbor, Community First and South Street at the beginning of 2013. Cost savings are also not reflected in the unaudited pro forma amounts for years ended December 31, 2014 and 2013, respectively (dollars in thousands).
	Actual from Acquisition Date through December 31,			Pro Forma for the Year Ended December 31,
	2014			2014				2013
Net interest income	$	13,488		$	156,650			$	141,778
Non-interest income	571			29,795				28,363
Net income	5,661			31,585				21,811
Net income available to common shareholders	5,661			31,585				10,751
Pro forma earnings per share:
Basic				$	0.97			$	0.65
Diluted				$	0.96			$	0.65
Acquisition of Randolph Bank & Trust Company
On October 1, 2013, the Company completed the acquisition of Randolph Bank & Trust Company (“Randolph”) pursuant to the terms of the Agreement and Plan of Merger dated May 31, 2013. Randolph was a commercial bank with approximately $284 million in assets that served small businesses and professionals and operated six branches in the Piedmont-Triad area of North Carolina. This acquisition aligned with the Company’s strategy of growth focused within existing markets.
Randolph shareholders could elect to receive 0.87 shares of the Company's voting common stock for each share of Randolph common stock, or cash in the amount of $10.00 per share, subject to allocation and pro-rata procedures to ensure 80% percent of Randolph 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, Randolph preferred shareholders, including the United States Department of the Treasury (“Treasury”), received cash payments equal to the liquidation value of their preferred shares.
A summary of assets received and liabilities assumed for Randolph, as well as the associated fair value adjustments, are as follows (dollars in thousands):
Assets	As Recorded by			Fair				As Recorded
	Randolph			Value Adjustments				by BNC
Cash and due from banks	$	14,207		$	—			$	14,207
Investment securities available-for-sale	5,082			130			-1	5,212
Federal Home Loan Bank stock, at cost	630			—				630
Loans	161,220			(6,973		)	-2	154,247
Premises and equipment	4,537			811			-3	5,348
Accrued interest receivable	800			—				800
Other real estate owned	4,844			(626		)	-4	4,218
Core deposit intangible	—			2,676			-5	2,676
Other assets	92,289			1,744			-6	94,033
Total assets acquired	$	283,609		$	(2,238	)		281,371
Liabilities
Deposits	$	(260,484	)	$	(523	)	-7	(261,007		)
Borrowings	(6,100		)	(209		)	-8	(6,309		)
Other liabilities	(1,291		)	—				(1,291		)
Total liabilities assumed	$	(267,875	)	$	(732	)		(268,607		)
Net assets acquired								12,764
Total consideration paid								14,037
Goodwill								$	1,273
Explanation of fair value adjustments:
-1	Adjustment for the fair value of the investment securities portfolio.
-2	Adjustment for the fair value of the loan portfolio.
-3	Adjustment for the fair value of premises and equipment.
-4	Adjustment for the fair value of other real estate owned.
-5	Adjustment for the fair value of the core deposit intangible.
-6	Adjustment for the deferred tax asset recognized from acquisition.
-7	Adjustment for the fair value of time deposits.
-8	Adjustment for the fair value of borrowings.
A summary of the consideration paid is as follows (dollars in thousands):
Common stock issued (726,634 shares)	$	9,642
Redemption of preferred stock	2,300
Cash payments to common stockholders	2,095
Total consideration paid	$	14,037
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 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	12 Months Ended
	Dec. 31, 2014
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 (dollars in thousands, except per share data):
		Year Ended December 31,
		2014		2013		2012
	Net income available to common shareholders	$	29,390	$	16,187	$	8,049
	Add: Convertible preferred stock dividends	—		—		361
	Net income available to participating common shareholders	$	29,390	$	16,187	$	8,410
	Weighted average common shares - basic	29,049,525		26,495,211		15,790,448
	Add: Effect of convertible preferred stock	—		187,873		1,804,566
	Weighted average participating common shares - basic	29,049,525		26,683,084		17,595,014
	Effects of dilutive Stock Rights	102,352		31,090		4,204
	Weighted average participating common shares - diluted	29,151,877		26,714,174		17,599,218
	Basic earnings per common share	$	1.01	$	0.61	$	0.48
	Diluted earnings per common share	$	1.01	$	0.61	$	0.48
	For the years ended December 31, 2014, 2013 and 2012, respectively, there were 0, 106,283 and 428,536 shares of Stock Rights excluded in computing diluted common shares outstanding.

Investment_Securities

Investment Securities	12 Months Ended
	Dec. 31, 2014
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 (dollars in thousands):
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
	31-Dec-14
	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
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
	31-Dec-13
	Available-for-sale:
	U.S. Government agencies	$	15,720			$	4			$	663			$	15,061
	State and municipals	194,224				2,704				5,665				191,263
	Corporate debt securities	9,011				16				138				8,889
	Other debt securities	4,727				—				347				4,380
	Equity securities	979				—				57				922
	Mortgage-backed securities:
	Residential government sponsored	41,231				1,442				659				42,014
	Other government sponsored	7,615				276				3				7,888
		$	273,507			$	4,442			$	7,532			$	270,417
	Held-to-maturity:
	State and municipals	$	221,378			$	379			$	10,169			$	211,588
	Corporate debt securities	16,000				—				1,081				14,919
	Other debt securities	10,000				—				—				10,000
		$	247,378			$	379			$	11,250			$	236,507
	The amortized cost and estimated fair value of investment securities at December 31, 2014, by contractual maturity, are shown below (dollars in thousands). 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
	Available-for-sale:
	Due within one year	$	10,853			$	10,851
	Due after one through five years	6,692				6,733
	Due after five through ten years	18,976				19,171
	Due after ten years	215,372				226,626
	Total debt securities	251,893				263,381
	Equity securities	6,145				5,909
		$	258,038			$	269,290
	Held-to-maturity:
	Due after one year through five years	$	17,155			$	16,600
	Due after five through ten years	22,784				22,858
	Due after ten years	197,153				202,539
		$	237,092			$	241,997
	At December 31, 2014 and 2013, investment securities with an estimated fair value of approximately $269.2 million and $184.0 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 (dollars in thousands):
		Year Ended December 31,
		2014				2013				2012
	Proceeds from sales	$	49,297			$	18,414			$	117,381
	Gross realized gains on sales	$	481			$	201			$	3,117
	Gross realized losses on sales	(992		)		(243		)		(91		)
	Total realized gains (losses), net	$	(511	)		$	(42	)		$	3,026
	During the year ended December 31, 2014, the Company made two sales of securities that were classified as held-to-maturity. The Company sold $3.3 million of 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. As a result of the downgrade of the securities, the Company's intent to hold these securities changed and management elected to divest of its interest in the downgraded securities. The Company recorded a realized gain of $0.2 million on this sale. The Company also sold $5.2 million of corporate debt securities due to regulatory capital restrictions. The Company recorded a realized loss of $0.1 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 (dollars in thousands):
		Less Than 12 Months											12 Months or More							Total
	31-Dec-14	Number of Securities			Fair Value				Unrealized Losses				Number of Securities			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	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
	Less Than 12 Months											12 Months or More							Total
31-Dec-13	Number of Securities			Fair Value				Unrealized Losses				Number of Securities			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Available-for-sale:
U.S. Government agencies	5			$	14,583			$	663			—			$	—	$	—	$	14,583	$	663
State and municipals	47			72,821				3,647				21			27,976		2,018		100,797		5,665
Corporate debt securities	2			7,862				138				—			—		—		7,862		138
Other debt securities	1			4,380				347				—			—		—		4,380		347
Equity securities	1			922				57				—			—		—		922		57
Mortgage-backed securities	15			14,146				444				4			4,582		218		18,728		662
	71			$	114,714			$	5,296			25			$	32,558	$	2,236	$	147,272	$	7,532
Held-to-maturity:
State and municipals	150			$	162,565			$	8,325			25			$	28,238	$	1,844	$	190,803	$	10,169
Corporate debt securities	1			4,939				61				1			2,980		1,020		7,919		1,081
	151			$	167,504			$	8,386			26			$	31,218	$	2,864	$	198,722	$	11,250
All state and municipal securities in an unrealized loss position were rated as investment grade at December 31, 2014. The Company noted that, of the 47 municipal securities in an unrealized loss position for greater than 12 months, none of the securities had an unrealized loss of greater than 3% of their carrying value. The corporate debt securities are issued by well-capitalized and sound financial institutions. The other debt security is backed by a pool of student loan debt and has an investment grade rating. 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 December 31, 2014 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 December 31, 2014.

Loans_and_Allowance_for_Loan_L

Loans and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Loans and Allowance for Loan Losses	Major categories of loans are presented below (dollars in thousands):
		December 31,
		2014												2013
		Originated				Acquired (1)				Total				Originated			Acquired (1)				Total
	Commercial real estate	$	1,181,492			$	403,672			$	1,585,164			$	1,014,633		$	318,023			$	1,332,656
	Commercial construction	265,968				48,668				314,636				202,140			42,420				244,560
	Commercial and industrial	154,132				38,200				192,332				139,567			29,372				168,939
	Leases	21,100				—				21,100				16,137			—				16,137
	Total commercial	1,622,692				490,540				2,113,232				1,372,477			389,815				1,762,292
	Residential construction	43,298				29,854				73,152				29,636			2,798				32,434
	Residential mortgage	439,600				432,818				872,418				294,660			173,263				467,923
	Consumer and other	10,851				5,445				16,296				8,103			5,765				13,868
		$	2,116,441			$	958,657			$	3,075,098			$	1,704,876		$	571,641			$	2,276,517
	-1	Amount includes $137.5 million and $187.7 million of acquired loans covered under FDIC loss-share agreements at December 31, 2014 and 2013, respectively. The unpaid principal balance for acquired loans covered under FDIC loss-share agreements was $140.4 million and $195.4 million at December 31, 2014 and 2013, respectively.
	Unearned income and net deferred fees and costs totaled $0.9 million and $2.3 million at December 31, 2014 and 2013, respectively.
	Covered loans acquired will be reimbursed for a substantial portion of any future losses on them under the terms of the FDIC loss-share agreements. The covered loans are reported in loans exclusive of the expected reimbursement from the FDIC. Covered loans are initially recorded at fair value at the acquisition date. The covered loans are and will be subject to the Company’s internal and external credit review and monitoring. Prospective losses incurred on covered loans are eligible for partial reimbursement by the FDIC. Subsequent decreases in the amount expected to be collected result in a provision for loan losses, an increase in the allowance for loan losses, and a proportional increase to the FDIC indemnification asset for the estimated amount to be reimbursed. Subsequent increases in the amount expected to be collected result in the reversal of any previously-recorded provision for loan losses and related allowance for loan losses and decreases to the FDIC indemnification asset, or accretion of certain fair value amounts into interest income in future periods if no provision for loan losses had been recorded.
	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 (dollars in thousands):
		Year Ended December 31,
		2014								2013
		Accretable Yield				Carrying Value				Accretable Yield				Carrying Value
	Balance at beginning of period	$	(6,058	)		$	187,661			$	(12,895	)		$	248,930
	Reductions from payments and foreclosures, net	—				(54,489		)		—				(70,042		)
	Reclass from non-accretable to accretable yield	(221		)		221				(968		)		968
	Accretion	4,066				4,066				7,805				7,805
	Balance at end of period	$	(2,213	)		$	137,459			$	(6,058	)		$	187,661
	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 nonaccrual status fall within the definition of credit-impaired covered loans.
	The following table presents loans acquired during the year ended December 31, 2014, at acquisition date, accounted for under ASC Topic 310-30 (dollars in thousands):
	Contractually required payments receivable	$	45,349
	Contractual cash flows not expected to be collected (non-accretable)	(8,674		)
	Expected cash flows	36,675
	Interest component of expected cash flows	(3,930		)
	Fair value of loans acquired	$	32,745
	The acquisition date unpaid balance of loans acquired during the year ended December 31, 2014 that did not have credit deterioration was $579.2 million, with an estimated fair value of $553.1 million. The discount of $26.1 million will be amortized on a level-yield basis over the economic life of the loans.
	The Company has the ability to borrow funds from the Federal Home Loan Bank (“FHLB”) and from the Federal Reserve Bank. At December 31, 2014 and 2013, real estate loans with carrying values of $1.10 billion and $759.2 million, respectively, were pledged to secure borrowing facilities from these institutions.
	The Company has loan relationships with its directors, executive officers, or their related interests. These loans were made on substantially the same terms, including rates and collateral, as those prevailing at the time for comparable transactions with other unrelated customers, and do not involve more than a normal risk of collection. Loans to principal officers, directors, and their affiliates during 2014 were as follows:
	Balance at beginning of year	$	6,463
	Additional borrowings	20,766
	Loan repayments	-21,933
	Balance at end of year	$	5,296
	A summary of the changes to the allowance for loan losses is presented below (dollars in thousands):
		Year Ended December 31,
		2014				2013				2012
	Beginning balance	$	32,875			$	40,292			$	31,008
	Provision for credit losses	7,006				12,188				22,737
	Change in FDIC indemnification asset	(1,575		)		1,084				17,711
	Charge-offs	(14,636		)		(28,428		)		(34,710		)
	Recoveries	6,729				7,739				3,546
	Ending balance	$	30,399			$	32,875			$	40,292
	A summary of the changes to the allowance for loan losses, by class of financing receivable, for the years ended December 31, 2014 and 2013 is presented below (dollars in thousands):
	2014		Commercial real estate				Commercial construction				Commercial and industrial				Leases			Residential construction				Residential Mortgage				Consumer and other			Total
	Allowance for loan losses:
	Balance December 31, 2013		$	14,752			$	6,738			$	3,137			$	56		$	213			$	7,730			$	249		$	32,875
	Charge-offs		(3,339		)		(3,483		)		(3,279		)		—			—				(4,344		)		(191		)	(14,636		)
	Recoveries		1,289				1,830				1,205				—			70				2,196				139			6,729
	Provision (1)		412				(155		)		2,281				47			293				4,161				(33		)	7,006
	Change in FDIC indemnification asset (1)		(429		)		(619		)		(118		)		—			(6		)		(430		)		27			(1,575		)
	Balance December 31, 2014		$	12,685			$	4,311			$	3,226			$	103		$	570			$	9,313			$	191		$	30,399
	2013		Commercial real estate				Commercial construction				Commercial and industrial				Leases			Residential construction				Residential Mortgage				Consumer and other			Total
	Allowance for loan losses:
	Balance December 31, 2012		$	15,718			$	9,807			$	3,578			$	18		$	593			$	10,441			$	137		$	40,292
	Charge-offs		(5,492		)		(9,519		)		(3,442		)		—			—				(9,598		)		(377		)	(28,428		)
	Recoveries		1,525				2,712				1,721				—			58				1,696				27			7,739
	Provision (2)		5,084				1,879				1,017				38			(412		)		4,224				358			12,188
	Change in FDIC indemnification asset (2)		(2,083		)		1,859				263				—			(26		)		967				104			1,084
Balance December 31, 2013		$	14,752			$	6,738			$	3,137			$	56		$	213			$	7,730			$	249		$	32,875
-1	The provision for loan losses includes the "net" provision on covered loans after coverage provided by FDIC loss-share agreements, which totaled $(0.6) million for the year ended December 31, 2014. This resulted in a decrease in the FDIC indemnification asset of $1.6 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 $2.2 million for the year ended December 31, 2014.
-2	The provision for loan losses includes the "net" provision on covered loans after coverage provided by FDIC loss-share agreements, which totaled $0.6 million for the year ended December 31, 2013. This resulted in an increase in the FDIC indemnification asset of $1.1 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 $1.7 million for the year ended December 31, 2013.
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
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
Balances at December 31, 2013:
Specific reserves:
Impaired loans		$	3,209			$	1,595			$	43			$	—		$	35			$	1,361			$	10		$	6,253
Purchase credit impaired loans		2,979				691				552				—			—				1,833				23			6,078
Total specific reserves		6,188				2,286				595				—			35				3,194				33			12,331
General reserves		8,564				4,452				2,542				56			178				4,536				216			20,544
Total		$	14,752			$	6,738			$	3,137			$	56		$	213			$	7,730			$	249		$	32,875
Loans:
Individually evaluated for impairment		$	33,950			$	12,877			$	1,525			$	—		$	356			$	14,037			$	165		$	62,910
Purchase credit impaired loans		100,290				18,460				6,649				—			16				50,825				1,917			178,157
Loans collectively evaluated for impairment		1,198,416				213,223				160,765				16,137			32,062				403,061				11,786			2,035,450
Total		$	1,332,656			$	244,560			$	168,939			$	16,137		$	32,434			$	467,923			$	13,868		$	2,276,517
The following tables present information related to impaired loans, excluding purchased impaired loans (dollars in thousands):
	Impaired Loans - With Allowance												Impaired Loans - With No Allowance
31-Dec-14	Recorded Investment				Unpaid Principal Balance				Allowances for Loan Losses Allocated				Recorded Investment			Unpaid Principal Balance
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 (non-covered):
Commercial real estate	429				428				43				—			—
Commercial construction	133				132				13				42			41
Commercial and industrial	204				203				16				1			—
Residential construction	308				308				185				114			114
Residential mortgage	1,574				1,614				279				2,869			3,338
Total acquired (non-covered)	2,648				2,685				536				3,026			3,493
Acquired (covered):
Commercial real estate	—				—				—				796			824
Commercial construction	—				—				—				427			426
Commercial and industrial	—				—				—				—			28
Residential mortgage	—				—				—				4,397			4,406
Total acquired (covered)	—				—				—				5,620			5,684
Total loans	$	22,045			$	22,027			$	2,989			$	33,293		$	33,782
	Impaired Loans - With Allowance												Impaired Loans - With No Allowance
31-Dec-13	Recorded Investment				Unpaid Principal Balance				Allowances for Loan Losses Allocated				Recorded Investment			Unpaid Principal Balance
Originated:
Commercial real estate	$	16,261			$	16,228			$	3,164			$	17,129		$	17,116
Commercial construction	7,239				7,218				1,582				5,536			5,902
Commercial and industrial	934				932				42				3			—
Residential construction	357				355				35				—			—
Residential mortgage	8,529				8,513				1,333				3,719			3,699
Consumer and other	104				104				10				37			37
Total originated	33,424				33,350				6,166				26,424			26,754
Acquired (non-covered):
Commercial real estate	490				489				45				557			565
Commercial construction	142				141				14				—			—
Commercial and industrial	185				185				1				406			648
Residential mortgage	636				636				27				1,236			1,528
Consumer and other	—				—				—				24			21
Total acquired (non-covered)	1,453				1,451				87				2,223			2,762
Acquired (covered):
Commercial real estate	—				—				—				173			183
Commercial construction	—				—				—				400			414
Commercial and industrial	—				—				—				3			35
Residential mortgage	—				—				—				5,788			5,877
Total acquired (covered)	—				—				—				6,364			6,509
Total loans	$	34,877			$	34,801			$	6,253			$	35,011		$	36,025
The following table presents information related to the average recorded investment and interest income recognized on impaired loans, excluding purchased impaired loans (dollars in thousands):
	Year Ended December 31,
	2014								2013
	Average Recorded Investment				Interest Income Recognized				Average Recorded Investment				Interest Income Recognized
Impaired loans with allowance:
Commercial real estate	$	16,618			$	584			$	20,205			$	839
Commercial construction	2,498				104				6,700				246
Commercial and industrial	1,190				23				499				28
Residential construction	407				26				367				12
Residential mortgage	7,119				102				11,074				381
Consumer and other	134				6				23				—
Total impaired loans with allowance	$	27,966			$	845			$	38,868			$	1,506
Impaired loans with no allowance:
Commercial real estate	$	15,658			$	445			$	12,724			$	600
Commercial construction	6,266				275				8,192				346
Commercial and industrial	156				—				592				30
Residential construction	113				6				—				—
Residential mortgage	12,376				481				10,614				357
Consumer and other	29				—				40				—
Total impaired loans with no allowance	$	34,598			$	1,207			$	32,162			$	1,333
For the years ended December 31, 2014 and 2013, 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.
The following tables present an aging analysis of the recorded investment in the Company's loans (dollars in thousands):
31-Dec-14	30-59 Days Past Due				60-89 Days Past Due				Greater than 90 Days Past Due				Non-Accrual			Total Past Due				Current				Total Loans
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 (non-covered):
Commercial real estate	291				155				—				433			879				330,135				331,014
Commercial construction	191				33				—				42			266				37,980				38,246
Commercial and industrial	73				—				—				52			125				34,266				34,391
Residential construction	—				—				—				422			422				29,432				29,854
Residential mortgage	1,946				848				—				4,239			7,033				376,087				383,120
Consumer and other	66				2				—				—			68				4,505				4,573
Total acquired (non-covered)	2,567				1,038				—				5,188			8,793				812,405				821,198
Acquired (covered):
Commercial real estate	589				—				—				4,075			4,664				67,994				72,658
Commercial construction	39				34				—				737			810				9,612				10,422
Commercial and industrial	48				27				—				145			220				3,589				3,809
Residential mortgage	254				—				—				6,073			6,327				43,371				49,698
Consumer and other	26				—				—				30			56				816				872
Total acquired (covered)	956				61				—				11,060			12,077				125,382				137,459
Total loans	$	7,325			$	2,391			$	—			$	24,723		$	34,439			$	3,040,659			$	3,075,098
31-Dec-13	30-59 Days Past Due				60-89 Days Past Due				Greater than 90 Days Past Due				Non-Accrual			Total Past Due				Current				Total Loans
Originated:
Commercial real estate	$	353			$	—			$	—			$	6,044		$	6,397			$	1,008,236			$	1,014,633
Commercial construction	14				20				—				2,801			2,835				199,305				202,140
Commercial and industrial	533				10				—				245			788				138,779				139,567
Leases	—				—				—				—			—				16,137				16,137
Residential construction	—				—				—				—			—				29,636				29,636
Residential mortgage	1,417				248				—				5,102			6,767				287,893				294,660
Consumer and other	—				—				—				37			37				8,066				8,103
Total originated	2,317				278				—				14,229			16,824				1,688,052				1,704,876
Acquired (non-covered):
Commercial real estate	116				—				—				605			721				220,850				221,571
Commercial construction	50				—				—				—			50				24,039				24,089
Commercial and industrial	—				5				—				591			596				22,857				23,453
Residential construction	—				—				—				—			—				2,782				2,782
Residential mortgage	950				514				—				1,665			3,129				105,110				108,239
Consumer and other	108				1				—				24			133				3,713				3,846
Total acquired (non-covered)	1,224				520				—				2,885			4,629				379,351				383,980
Acquired (covered):
Commercial real estate	1,145				848				—				8,086			10,079				86,373				96,452
Commercial construction	201				38				—				5,111			5,350				12,981				18,331
Commercial and industrial	—				47				—				640			687				5,232				5,919
Residential construction	—				—				—				—			—				16				16
Residential mortgage	313				28				—				9,818			10,159				54,865				65,024
Consumer and other	8				2				—				90			100				1,819				1,919
Total acquired (covered)	1,667				963				—				23,745			26,375				161,286				187,661
Total loans	$	5,208			$	1,761			$	—			$	40,859		$	47,828			$	2,228,689			$	2,276,517
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 (dollars in thousands):
31-Dec-14	Total				Pass				Special Mention				Substandard			Doubtful				Loss
Originated:
Commercial real estate	$	1,181,492			$	1,100,361			$	46,935			$	34,196		$	—			$	—
Commercial construction	265,968				256,987				5,530				3,451			—				—
Commercial and industrial	154,132				145,722				3,980				4,430			—				—
Leases	21,100				21,100				—				—			—				—
Residential construction	43,298				42,806				143				349			—				—
Residential mortgage	439,600				407,319				20,946				11,335			—				—
Consumer and other	10,851				10,331				428				92			—				—
Total originated	2,116,441				1,984,626				77,962				53,853			—				—
Total acquired (non-covered):
Commercial real estate	331,014				295,238				23,456				12,320			—				—
Commercial construction	38,246				29,975				5,258				3,013			—				—
Commercial and industrial	34,391				32,757				477				1,157			—				—
Residential construction	29,854				28,833				—				1,021			—				—
Residential mortgage	383,120				341,268				26,063				15,548			241				—
Consumer and other	4,573				4,494				79				—			—				—
Total acquired (non-covered):	821,198				732,565				55,333				33,059			241				—
Acquired (covered):
Commercial real estate	72,658				47,002				12,360				13,211			85				—
Commercial construction	10,422				6,371				652				3,307			92				—
Commercial and industrial	3,809				3,282				167				325			35				—
Residential mortgage	49,698				29,255				10,035				9,068			1,340				—
Consumer and other	872				762				80				30			—				—
Total acquired (covered)	137,459				86,672				23,294				25,941			1,552				—
Total loans	$	3,075,098			$	2,803,863			$	156,589			$	112,853		$	1,793			$	—
31-Dec-13	Total				Pass Credits				Special Mention				Substandard			Doubtful				Loss
Originated:
Commercial real estate	$	1,014,633			$	930,554			$	37,685			$	46,394		$	—			$	—
Commercial construction	202,140				175,365				13,113				13,662			—				—
Commercial and industrial	139,567				131,658				5,411				2,498			—				—
Leases	16,137				16,137				—				—			—				—
Residential construction	29,636				28,160				1,120				356			—				—
Residential mortgage	294,660				258,042				19,234				17,384			—				—
Consumer and other	8,103				7,807				177				119			—				—
Total originated	1,704,876				1,547,723				76,740				80,413			—				—
Acquired (non-covered):
Commercial real estate	221,571				195,526				17,343				8,702			—				—
Commercial construction	24,089				21,126				922				2,041			—				—
Commercial and industrial	23,453				18,681				3,328				1,444			—				—
Residential construction	2,782				2,782				—				—			—				—
Residential mortgage	108,239				91,847				10,766				5,626			—				—
Consumer and other	3,846				3,760				62				24			—				—
Total acquired (non-covered)	383,980				333,722				32,421				17,837			—				—
Acquired (covered):
Commercial real estate	96,452				61,091				12,831				17,929			4,601				—
Commercial construction	18,331				9,756				1,397				6,751			427				—
Commercial and industrial	5,919				4,231				796				332			560				—
Residential construction	16				—				16				—			—				—
Residential mortgage	65,024				36,744				13,246				10,296			4,738				—
Consumer and other	1,919				1,726				103				90			—				—
Total acquired (covered)	187,661				113,548				28,389				35,398			10,326				—
Total loans	$	2,276,517			$	1,994,993			$	137,550			$	133,648		$	10,326			$	—
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 (dollars in thousands):
	Accrual				Nonaccrual				Total TDRs				Allowance for Loan Losses Allocated
31-Dec-14
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
Total contracts	33				2				35
	Accrual				Nonaccrual				Total TDRs				Allowance for Loan Losses Allocated
31-Dec-13
Commercial real estate	$	3,986			$	1,107			$	5,093			$	767
Commercial construction	5,472				274				5,746				520
Commercial and industrial	662				—				662				36
Residential mortgage	6,545				625				7,170				476
Consumer and other	105				37				142				11
Total modifications	$	16,770			$	2,043			$	18,813			$	1,810
Total contracts	43				10				53
At December 31, 2014 and 2013, 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 (dollars in thousands). All balances represent the recorded investment at the end of the period in which the modification was made.
	Year Ended December 31, 2014
	Term Modification				Interest only Modification				Payment Modification				Combination Modification			Total Modifications
Commercial real estate	$	—			$	—			$	1,300			$	—		$	1,300
Commercial construction	—				447				—				—			447
Commercial and industrial	153				—				—				—			153
Residential mortgage	—				479				—				755			1,234
Consumer and other	—				—				10				—			10
Total modifications	$	153			$	926			$	1,310			$	755		$	3,144
	Year Ended December 31, 2013
	Rate Modification				Term Modification				Interest only Modification				Combination Modification			Total Modifications
Commercial real estate	$	101			$	648			$	331			$	1,035		$	2,115
Commercial construction	128				—				152				827			1,107
Commercial and industrial	—				129				536				—			665
Residential mortgage	452				84				1,076				573			2,185
Consumer and other	—				23				—				—			23
Total modifications	$	681			$	884			$	2,095			$	2,435		$	6,095
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 (dollars in thousands). The Company defines payment default as movement of the restructuring to nonaccrual status, foreclosure or charge-off, whichever occurs first.
	Year Ended December 31,
	2014				2013
Commercial real estate	$	1,210			$	—
Commercial construction	1,245				5,906
Commercial and industrial	—				29
Residential construction	—				630
Residential mortgage	129				688
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 (dollars in thousands):
	Year Ended December 31,
	2014				2013				2012
Loans held for sale	$	37,280			$	30,899			$	57,414
Proceeds from sales of loans held for sale	292,497				352,130				233,276
Mortgage fees	7,689				8,979				6,169

FDIC_Indemnification_Asset

FDIC Indemnification Asset	12 Months Ended
	Dec. 31, 2014
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 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 (dollars in thousands):
		Year Ended December 31,
		2014			2013
	Balance at beginning of period	$	16,886		$	53,519
	Accretion of present value discount, net	1,061			192
	Post-acquisition adjustments	(2,920		)	(2,248		)
	Receipt of payments from FDIC	(9,930		)	(34,577		)
	Balance at end of period	$	5,097		$	16,886
	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 OREO change.

Goodwill_and_Other_Intangibles

Goodwill and Other Intangibles	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangibles	GOODWILL AND OTHER INTANGIBLES
	The following table presents activity for goodwill and other intangible assets for the years ended December 31, 2014 and 2013 (dollars in thousands):
		Goodwill			Other Intangibles			Total
	Balance at December 31, 2012	$	27,111		$	5,082		$	32,193
	Acquisitions	1,273			2,676			3,949
	Amortization	—			(1,176		)	(1,176		)
	Balance at December 31, 2013	28,384			6,582			34,966
	Acquisitions	41,365			9,710			51,075
	Amortization	—			(2,340		)	(2,340		)
	Balance at December 31, 2014	$	69,749		$	13,952		$	83,701
	The Company performed the annual impairment test of goodwill as of June 30, 2014. The annual impairment test indicated that the estimated fair value exceeded the carrying value (including goodwill) for the Company’s reporting unit. Therefore, a step two analysis was not required and no impairment charge was recorded.
	The following table presents the gross carrying amount and accumulated amortization for the Company’s core deposit intangible assets, which are the only identifiable intangible assets subject to amortization (dollars in thousands):
		December 31,
		2014			2013
	Gross carrying amount	$	19,624		$	9,914
	Accumulated amortization	(5,672		)	(3,332		)
	Net book value	$	13,952		$	6,582
	At December 31, 2014, the weighted-average remaining life of core deposit intangibles was 5.5 years.
	The following table presents estimated future amortization expense for other intangible assets (dollars in thousands):
	2015	$	3,148
	2016	2,639
	2017	2,361
	2018	2,361
	2019	2,035
	Thereafter	1,408
	Total	$	13,952

Premises_and_Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2014
Premises and Equipment [Abstract]
Premises and Equipment	PREMISES AND EQUIPMENT
	The following tables present a summary of the Company’s premises and equipment (dollars in thousands):
		December 31,
		2014			2013
	Land	$	26,397		$	23,264
	Buildings and leasehold improvements	60,188			49,689
	Furniture, fixtures and equipment	23,161			20,290
	Construction in progress	114			178
	Premises and equipment, gross	109,860			93,421
	Less accumulated depreciation and amortization	(22,099		)	(17,295		)
	Premises and equipment, net	$	87,761		$	76,126
	Depreciation and amortization expense for the years ended December 31, 2014, 2013 and 2012 amounted to $5.3 million, $4.2 million and $3.0 million, respectively.
	The Company has entered into various non-cancellable operating leases for land and buildings used in its operations that expire at various dates through 2029. Most of the leases contain renewal options. Certain leases provide for periodic rate negotiation or escalation. The leases generally provide for payment of property taxes, insurance and maintenance costs by the Company. Rental expense, including month-to-month leases, reported in non-interest expense was $3.8 million, $3.1 million, and $2.4 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	At December 31, 2014, future minimum rental commitments under non-cancellable operating leases that have a remaining life in excess of one year are as follows (dollars in thousands):
	2015	$	4,002
	2016	3,481
	2017	3,064
	2018	2,818
	2019	2,461
	Thereafter	6,843
	Total	$	22,669

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2014
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. In March 2013, the Company entered into a forward-starting interest rate swap transaction with a notional amount of $125 million to effectively convert $125 million of its variable-rate money market funding arrangement to fixed interest rate debt at the forward-starting date of the swap transaction. The effective date of this interest rate swap was September 16, 2014 and the termination date is March 18, 2019. The swap transaction 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, which are indexed to one-month LIBOR.
	During the first quarter of 2009, the Company entered into a five year interest rate derivative contract, with a notional amount of $250 million, to offset the effects of interest rate changes on an unsecured $250 million variable rate money market funding arrangement. The interest rate cap matured on February 16, 2014.
	Derivatives Not Designated as Hedges
	The Company utilizes derivative financial instruments, including 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 December 31, 2014 and 2013, the Company had notional amounts of $34.7 million and $31.2 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 (dollars in thousands):
		31-Dec-14									31-Dec-13
		Notional Amount			Balance Sheet Location		Fair Value				Notional Amount				Balance Sheet Location	Fair Value
	Derivative assets:
	Derivatives designated as hedging instruments:
	Interest rate cap	N/A			N/A		N/A				$	250,000			Other assets	$	—
	Interest rate swap	$	—		Other assets		$	—			125,000				Other assets	2,744
		$	—				$	—			$	375,000				$	2,744
	Derivatives not designated as hedging instruments:
	Interest rate swaps	$	34,692		Other assets		$	723			$	27,965			Other assets	$	424
	Interest rate cap/floor	—			Other assets		—				3,256				Other assets	98
		$	34,692				$	723			$	31,221				$	522
	Derivative liabilities:
	Derivatives designated as hedging instruments:
	Interest rate swap	$	125,000		Accrued expenses and other liabilities		$	308			$	—			Accrued expenses and other liabilities	$	—
	Derivatives not designated as hedging instruments:
	Interest rate swaps	$	34,692		Accrued expenses and other liabilities		$	723			$	31,221			Accrued expenses and other liabilities	$	522
	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 (dollar amounts in thousands):
													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
	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
	31-Dec-13
	Derivative assets	$	3,266		$	—			$	3,266			$	—		$	930	$	2,336
	Derivative liabilities	522			—				522				—			522		—
	Total derivative instruments	$	3,788		$	—			$	3,788			$	—		$	1,452	$	2,336
	The Company has recorded a net loss of $0.2 million, net of tax, as accumulated other comprehensive income at December 31, 2014 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 (dollars in thousands, net of tax):
		Year Ended December 31,
		2014			2013				2012
	Derivatives designated as hedging instruments:
	Amount of net gains (losses) recorded in OCI (effective portion)	$	(1,923	)	$	1,662			$	(364	)
	Amount of net losses reclassified from OCI to earnings (1)	286			6,103				4,878
	(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 years ended December 31, 2014, 2013 and 2012. 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 December 31, 2014, the aggregate fair value of derivative instruments with credit-risk-related contingent features that were in a net liability position was $1.0 million, for which the Company has posted collateral with a fair value of $3.2 million.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2014
Deposits [Abstract]
Deposits	DEPOSITS
	The following tables present the scheduled maturities of time deposits at December 31, 2014 (dollars in thousands):
		Less than $100,000		$100,000 and Greater		Total
	2015	$	250,746	$	495,177	$	745,923
	2016	42,616		112,698		155,314
	2017	28,946		119,384		148,330
	2018	13,442		108,462		121,904
	2019	4,332		26,501		30,833
	Thereafter	103		1,267		1,370
	Total	$	340,185	$	863,489	$	1,203,674

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Borrowings	BORROWINGS
	The following table presents the Company’s short-term borrowings (dollars in thousands):
		December 31,
		2014				2013
	Repurchase agreements	$	25,834			$	27,202
	Advances from FHLB	102,100				97,300
	Federal funds purchased	—				1,090
	Total short-term borrowings	$	127,934			$	125,592
	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 Company may purchase federal funds through unsecured federal funds lines of credit totaling $90.0 million at December 31, 2014. These lines are intended for short-term borrowings and are subject to restrictions limiting the frequency and terms of advances. These lines of credit are payable on demand and bear interest based upon the daily federal funds rate.
	Additional information on the Company’s short-term borrowings is presented in the following table (dollars in thousands):
		Years Ended December 31,
		2014				2013				2012
	Maximum outstanding at any month-end during the year	$	195,941			$	143,674			$	40,149
	Average outstanding balance	96,043				88,635				30,573
	Average interest rate for the year	0.45		%		0.49		%		1.11		%
	Average interest rate at year end	0.28		%		0.39		%		0.51		%
	On November 14, 2014, the Parent Company 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. Borrowings under the Credit Agreement bear interest in an amount equal to the greater of (i) 3.25% per annum and (ii) the higher of: (x) the prevailing rate of interest, on a per annum basis, described in the Eastern Edition of The Wall Street Journal as the prime lending rate, as in effect from time to time, and (y) the Federal Funds Rate, as in effect from time to time, plus one-half of one percent per annum, and matures on November 13, 2015. There were no borrowings outstanding under the Credit Agreement at December 31, 2014.
	The following table presents the Company’s long-term debt (dollars in thousands):
		December 31,
		2014				2013
	FHLB advances	$	52,000			$	51,100
	Subordinated notes	60,000				—
	Unsecured term loan	—				28,875
	Junior subordinated debentures	23,713				23,713
		135,713				103,688
	Less: FHLB prepayment penalty	1,899				2,179
	Total long-term debt	$	133,814			$	101,509
	The following table details the Company's long-term FHLB advances outstanding (dollars in thousands):
					December 31,
	Maturity		Interest Rate		2014				2013
	Jan-15		1.00%		$	—			$	100
	Aug-15		2.37%		—				6,000
	Jul-16		0.88%		2,000				—
	Aug-16		1.72%		2,000				—
	Jan-18		2.15%		15,000				15,000
	Jan-18		2.27%		10,000				10,000
	Jul-18		1.78%		3,000				—
	Jan-20		0.47%		10,000				10,000
	Jan-20		0.47%		10,000				10,000
					$	52,000			$	51,100
	The advances from the FHLB have been made against a $548.3 million line of credit secured by real estate loans and investment securities with carrying values of $824.3 million and $8.4 million, respectively, at December 31, 2014. The weighted average interest rate paid on FHLB advances was 2.83% and 2.46% for the years ended December 31, 2014 and 2013, 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 December 31, 2014, commercial loans and investment securities with carrying values of $272.6 million and $2.8 million, respectively, were assigned under these arrangements. At December 31, 2014, the Company had approximately $169.9 million in borrowing capacity available under these arrangements with no outstanding balance due.
	The following tables detail the junior subordinated debentures outstanding (dollars in thousands):
		Date of issuance		Shares issued		Interest rate		Maturity date		December 31,
										2014			2013
	BNC Bancorp Capital Trust I	4/3/03		5,000		Libor plus 3.25%		4/15/33		$	5,155		$	5,155
	BNC Bancorp Capital Trust II	3/11/04		6,000		Libor plus 2.80%		4/7/34		6,186			6,186
	BNC Capital Trust III	9/23/04		5,000		Libor plus 2.40%		9/23/34		5,155			5,155
	BNC Capital Trust IV	9/27/06		7,000		Libor plus 1.70%		12/31/36		7,217			7,217
	Total									$	23,713		$	23,713
	The junior subordinated debentures issued by the trusts currently qualify as Tier I capital for the Company, subject to certain limitations, and constitute a full and unconditional guarantee by the Company of the trust’s obligations under the preferred securities. At December 31, 2014 and 2013, respectively, the Company had $0.7 million of equity investment in the above wholly-owned Capital Trusts and is included in other assets in the accompanying consolidated balance sheets. The weighted average rate for the junior subordinated debentures outstanding for the years ending December 31, 2014 and 2013 was 2.71% and 2.86%, respectively.
	On September 30, 2014, the Parent Company issued $60.0 million of 5.5% Fixed to Floating Rate Subordinated Notes (the "Subordinated Notes"). The Subordinated Notes bear interest at a fixed rate of 5.5% per year for the first five years and, from October 1, 2019 to the October 1, 2024 maturity date, the interest rate will reset quarterly to an annual interest rate equal to the then current three-month LIBOR plus 359 basis points. The Subordinated Notes are redeemable by the Parent Company at any quarterly interest payment date beginning on October 1, 2019 to maturity at par, plus accrued and unpaid interest. A portion of the proceeds from the sale of Subordinated Notes were used to repay the outstanding principal balance, along with accrued interest and prepayment penalties, on the unsecured term loan, while the remainder will be used for general corporate purposes. The subordinated notes qualify as Tier II capital for the Parent Company, under federal regulatory capital rules.
	The Company was not aware of any violations of loan covenants at December 31, 2014.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income	The following table presents the changes in accumulated other comprehensive income, net of taxes (dollars in thousands):
			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
	Balance at December 31, 2012		$	8,872		$	2,881		$	(6,324	)	$	5,429
	Other comprehensive income (loss) before reclassifications		(9,625		)	—			1,662			(7,963		)
	Amounts reclassified from accumulated other comprehensive income		26			(289		)	6,103			5,840
	Amounts transferred as a result of the reclassification of securities from available-for-sale to held-to-maturity		(1,219		)	1,219			—			—
	Net current period other comprehensive income (loss)		(10,818		)	930			7,765			(2,123		)
	Balance at December 31, 2013		(1,946		)	3,811			1,441			3,306
	Other comprehensive income (loss) before reclassifications		8,713			—			(1,923		)	6,790
	Amounts reclassified from accumulated other comprehensive income		322			(522		)	286			86
	Net current period other comprehensive income (loss)		9,035			(522		)	(1,637		)	6,876
	Balance at December 31, 2014		$	7,089		$	3,289		$	(196	)	$	10,182
	The following table details reclassification adjustments from accumulated other comprehensive income (dollars in thousands):
			Year Ended December 31,
	Component of Accumulated Other Comprehensive Income		2014			2013			Affected Line Item in the Consolidated Statement of Income
	Unrealized holding gains on investment securities available-for-sale		$	(511	)	$	(42	)	Gain (loss) on sale of investment securities, net
			189			16			Income tax benefit (expense)
			(322		)	(26		)	Total, net of tax
	Unrealized holding gains on investment securities transferred from available-for-sale to held-to-maturity (1)		829			623			Interest income - investment securities
			(307		)	(334		)	Income tax benefit (expense)
			522			289			Total, net of tax
	Unrealized holding losses on cash flow hedging activities		(457		)	(9,863		)	Interest expense - demand deposits
			171			3,760			Income tax benefit (expense)
			(286		)	(6,103		)	Total, net of tax
	Total reclassifications for the period		$	(86	)	$	(5,840	)
	-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	12 Months Ended
	Dec. 31, 2014
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 (dollars in thousands):
			Total Measured at Fair Value			Fair Value Measured Using
	Description					Level 1				Level 2			Level 3
	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		$	—
			Total Measured at Fair Value			Fair Value Measured Using
	Description					Level 1				Level 2			Level 3
	31-Dec-13
	Assets:
	Investment securities available-for-sale:
	U.S. Government agencies		$	15,061		$	—			$	15,061		$	—
	State and municipals		191,263			—				191,263			—
	Corporate debt securities		8,889			—				8,889			—
	Other debt securities		4,380			—				4,380			—
	Equity securities		922			922				—			—
	Mortgage-backed securities:
	Residential government sponsored		42,014			—				42,014			—
	Other government sponsored		7,888			—				7,888			—
	Total investment securities available-for-sale		270,417			922				269,495			—
	Derivative instruments:
	Interest rate swap - cash flow hedge		2,744			—				2,744			—
	Interest rate swap - not designated		424			—				424			—
	Interest rate cap/floor - not designated		98			—				98			—
	Total derivative instruments		3,266			—				3,266			—
	Total assets measured at fair value on a recurring basis		$	273,683		$	922			$	272,761		$	—
	Liabilities:
	Interest rate swap - not designated		$	522		$	—			$	522		$	—
	Total liabilities measured at fair value on a recurring basis		$	522		$	—			$	522		$	—
	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 (dollars in thousands):
			Total Measured at Fair Value			Fair Value Measured Using
	Description					Level 1				Level 2			Level 3
	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
31-Dec-13
Loans held for sale		$	30,899		$	—			$	30,899		$	—
Impaired loans		228,736			—				—			228,736
Other real estate owned		47,606			—				—			47,606
Total assets measured at fair value on a nonrecurring basis		$	307,241		$	—			$	30,899		$	276,342
The following table presents the valuation and unobservable inputs for Level 3 assets and liabilities measured at fair value on a nonrecurring basis at December 31, 2014 (dollars in thousands):
Description		Fair Value			Valuation Methodology		Unobservable Inputs		Range of Inputs
Impaired loans		$	190,247		Appraised value		Discount to reflect current market conditions and ultimate collectability		0% - 20%
Other real estate owned		$	42,531		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 (dollars in thousands):
31-Dec-14	Carrying Value			Fair Value				Level 1			Level 2			Level 3
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			—
31-Dec-13	Carrying Value			Fair Value				Level 1			Level 2			Level 3
Financial assets:
Cash and cash equivalents	$	108,390		$	108,390			$	108,390		$	—		$	—
Investment securities available-for-sale	270,417			270,417				922			269,495			—
Investment securities held-to-maturity	247,378			236,507				—			236,507			—
Federal Home Loan Bank stock	10,720			10,720				—			10,720			—
Loans held for sale	30,899			30,899				—			30,899			—
Loans receivable, net	2,243,642			2,266,455				—			2,037,719			228,736
Accrued interest receivable	12,955			12,955				—			12,955			—
FDIC indemnification asset	16,886			16,886				—			—			16,886
Investment in bank-owned life insurance	78,439			78,439				—			78,439			—
Interest rate swap derivative - cash flow hedge	2,744			2,744				—			2,744			—
Interest rate swap derivative - not designated	424			424				—			424			—
Interest rate cap/floor derivative - not designated	98			98				—			98			—
Financial liabilities:
Demand deposits and savings	$	1,623,931		$	1,623,931			$	—		$	1,623,931		$	—
Time deposits	1,082,799			1,087,333				—			1,087,333			—
Short-term borrowings	125,592			125,592				—			125,592			—
Long-term debt	101,509			97,983				—			97,983			—
Accrued interest payable	1,434			1,434				—			1,434			—
Interest rate swap derivative - not designated	522			522				—			522			—
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.

Regulatory_Capital

Regulatory Capital	12 Months Ended
	Dec. 31, 2014
Banking and Thrift [Abstract]
Regulatory Capital	REGULATORY CAPITAL REQUIREMENTS
	BNC, as a North Carolina banking corporation, may pay cash dividends to the Company only out of undivided profits as determined pursuant to North Carolina General Statutes Section 53-87. However, regulatory authorities may limit payment of dividends by any bank when it is determined that such a limitation is in the public interest and is necessary to ensure financial soundness of the bank.
	The Parent Company and BNC are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory - and possibly additional discretionary - actions by regulators that, if undertaken, could have a material adverse effect on the Company’s consolidated financial statements. Capital adequacy guidelines and the regulatory framework for prompt corrective action prescribe specific capital guidelines that involve quantitative measures of BNC’s assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. BNC’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. As of December 31, 2014, the most recent notification from the FDIC categorized BNC as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized BNC must maintain minimum amounts and ratios, as set forth in the table below. There are no conditions or events since that notification that management believes have changed BNC’s category. Prompt corrective action provisions are not applicable to bank holding companies.
	Quantitative measures established by regulation to ensure capital adequacy require the Parent Company and BNC to maintain minimum amounts and ratios, as prescribed by regulations, of total and Tier I capital to risk-weighted assets and of Tier I capital to average assets.
	The following tables present BNC’s regulatory capital ratios (dollars in thousands):
									For capital adequacy purposes				To be well capitalized under prompt corrective action provisions
			Actual						Minimum				Minimum
	31-Dec-14		Amount				Ratio		Amount		Ratio		Amount		Ratio
	Total capital (to risk weighted assets)		$	390,900			12.21	%	$	256,200	8	%	$	320,250	10	%
	Tier 1 capital (to risk weighted assets)		360,457				11.26	%	128,100		4	%	192,150		6	%
	Tier 1 capital (to average assets)		360,457				9.74	%	147,992		4	%	184,990		5	%
									For capital adequacy purposes				To be well capitalized under prompt corrective action provisions
			Actual						Minimum				Minimum
	31-Dec-13		Amount				Ratio		Amount		Ratio		Amount		Ratio
	Total capital (to risk weighted assets)		$	313,624			12.66	%	$	198,187	8	%	$	247,734	10	%
	Tier 1 capital (to risk weighted assets)		282,634				11.41	%	99,094		4	%	148,640		6	%
	Tier 1 capital (to average assets)		282,634				8.96	%	126,118		4	%	157,647		5	%
	The following table presents the Company’s regulatory capital ratios:
		December 31,
		2014			2013
	Total capital (to risk-weighted assets)	12.49	%		11.57	%
	Tier 1 capital (to risk-weighted assets)	9.71	%		10.33	%
	Tier 1 capital (to average assets)	8.41	%		8.12	%

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES
	The following tables present the Company’s income tax expense (benefit) (dollars in thousands):
		Year Ended December 31,
		2014			2013			2012
	Current income tax provision (benefit):
	Federal	$	9,159		$	(314	)	$	(140	)
	State	1,257			554			350
	Total current income tax provision	10,416			240			210
	Deferred income tax provision (benefit):
	Federal	(1,181		)	2,382			(2,244		)
	State	1,130			1,423			334
	Total deferred income tax provision (benefit)	(51		)	3,805			(1,910		)
	Total income tax provision (benefit)	$	10,365		$	4,045		$	(1,700	)
	The following tables present the difference between income tax expense (benefit) and the amount computed by applying the statutory income tax rate (dollars in thousands):
		Year Ended December 31,
		2014			2013			2012
	Tax at statutory federal tax rate	$	13,517		$	7,239		$	2,976
	State income tax, net of federal benefit	1,575			1,304			451
	Tax exempt interest income	(4,485		)	(4,008		)	(3,241		)
	Income from life insurance	(810		)	(789		)	(601		)
	Gain on acquisition	—			—			(1,690		)
	Other	568			299			405
	Total income tax provision (benefit)	$	10,365		$	4,045		$	(1,700	)
	Significant components of deferred tax assets and liabilities were as follows (dollars in thousands):
		December 31,
		2014			2013
	Deferred income tax assets:
	Allowance for loan losses	$	14,996		$	10,660
	Net operating loss carryforwards	9,595			10,593
	Deferred compensation	2,229			2,203
	Unrealized loss on interest rate cap	114			—
	Other real estate owned writedowns	3,519			3,536
	AMT credit carryforward	12,033			3,488
	Interest on nonaccrual loans	270			110
	Stock-based compensation	971			546
	Fair value adjustments from acquisitions	16,332			6,273
	Other	1,699			1,089
	Total deferred income tax assets	61,758			38,498
	Deferred income tax liabilities:
	Premises and equipment	4,030			2,978
	Leasing activities	728			702
	Unrealized gains on investment securities and derivatives	4,163			2,110
	Deferred loan costs and fees	1,950			979
	Core deposit intangibles	5,037			2,306
	FDIC acquisitions	337			4,424
	Other	1,629			1,554
	Total deferred income tax liabilities	17,874			15,053
	Less valuation allowance	2,906			360
	Net deferred income tax asset	$	40,978		$	23,085
	The valuation allowance of $2.9 million at December 31, 2014 relates to the net operating loss carryforwards obtained from business combinations for which realizability is uncertain.
	The Company adjusted its net deferred income tax asset as a result of reductions in the North Carolina corporate income tax rate, which reduced the state income tax rate to 5% effective January 1, 2015.
	In assessing the realizability of the Company's deferred income tax asset, the Company considered whether it is more likely than not that some portion or all of the deferred income tax asset will not be realized in accordance with the guidance provided by ASC 740. The ultimate realization of deferred income tax assets is dependent upon the generation of future taxable income during periods in which those temporary differences become deductible. The Company considers the scheduled reversal of deferred income tax liabilities, projected future taxable income and tax planning strategies in making this assessment. Based on the weight of available evidence, the Company determined that it is more likely than not that it will be able to realize the benefits of the deferred income tax asset, net of valuation allowance, at December 31, 2014.
	At December 31, 2014, the Company had net operating loss and other carryforwards of approximately $19.9 million available to offset future taxable income, expiring in 2032.
	When tax returns are filed, it is highly certain that some positions taken would be sustained upon examination by the taxing authorities, while others are subject to uncertainty about the merits of the position taken or the amount of the position that would be ultimately sustained. The benefit of a tax position is recognized in the financial statements in the period during which, based on all available evidence, management believes it is more likely than not that the position will be sustained upon examination, including the resolution of appeals or litigation processes, if any. Tax positions taken are not offset or aggregated with other positions. Tax positions that meet the more-likely-than-not recognition threshold are measured as the largest amount of tax benefit that is more than 50 percent likely of being realized upon settlement with the applicable taxing authority. The portion of the benefits associated with tax positions taken that exceeds the amount measured as described above is reflected as a liability for unrecognized tax benefits in the accompanying consolidated balance sheet along with any associated interest and penalties that would be payable to the taxing authorities upon examination. The Company did not have an accrual for uncertain tax positions at December 31, 2014 or 2013.
	We are subject to routine audits of our tax returns by the Internal Revenue Service and various state taxing authorities. With few exceptions, we are no longer subject to Federal and state income tax examinations by tax authorities for years before 2011. There are no indications of any material adjustments relating to any examination currently being conducted by any taxing authority.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
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 (dollars in thousands):
		December 31,
		2014		2013
	Commitments under unfunded loans and lines of credit	$	663,137	$	377,021
	Letters of credit	6,607		7,926
	Unused credit card lines	4,512		4,120
	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 and $7.5 million was unfunded at December 31, 2014 and 2013, 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	12 Months Ended
	Dec. 31, 2014
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 December 31, 2014, 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 December 31, 2014, the Company had 247,187 Rights issued under the 2006 Omnibus Plan, 461,573 Rights issued and 970,673 Rights available for grants or awards under the 2013 Omnibus Plan, and 230,285 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 years ended December 31, 2014, 2013 and 2012.
	A summary of the Company’s stock option activity for the year ended December 31, 2014 is presented below (dollars in thousands, except per share data):
		Shares		Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
	Outstanding at December 31, 2013	412,337		$	11.34
	Exercised	74,559		11.23
	Forfeited or expired	—		—
	Outstanding at December 31, 2014	337,778		$	11.37	2.24	$	1,734
	Exercisable at December 31, 2014	336,354		$	11.37	2.23	$	1,725
	Share options expected to vest	1,424		$	9.67	5.27	$	10
	The related compensation expense recognized for stock options was immaterial for the years ended December 31, 2014, 2013 and 2012. respectively. At December 31, 2014, 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 0.36 years. For the years ended December 31, 2014, 2013 and 2012, the intrinsic value of stock option exercised was $0.4 million, $0 and $0.1 million, respectively, and the grant-date fair value of options vested was $0, $0 and $0.3 million, respectively.
	Cash received from stock option exercises under all share-based payment arrangements for the years ended December 31, 2014, 2013 and 2012 was $0.2 million, $0 and $0.3 million, respectively. The actual tax benefit realized for income tax deductions from stock option exercises was $0.1 million, $0 and $0 for the years ended December 31, 2014, 2013 and 2012, respectively.
	Restricted Stock Awards. A summary of the activity of the Company’s unvested restricted stock awards for the year ended December 31, 2014 is presented below:
		Number of Shares		Weighted Average Grant-Date Fair Value
	Unvested at December 31, 2013	303,396		$	9.58
	Granted	461,653		16.9
	Vested	(160,780	)	10.62
	Forfeited	(3,001	)	14.6
	Unvested at December 31, 2014	601,268		$	14.9
	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 years ended December 31, 2014, 2013 and 2012 was $2.2 million, $1.2 million and $0.5 million respectively. At December 31, 2014, there was $7.7 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 2.60 years. The grant-date fair value of restricted stock grants vested during the year ended December 31, 2014, 2013 and 2012 was $1.7 million, $0.9 million and $0.3 million, respectively.
	Qualified Profit Sharing 401(k) Plan - The Company maintains a qualified profit sharing 401(k) plan for employees 20.5 years of age or over which covers substantially all employees. Under the plan, employees may contribute up to an annual maximum as determined by the Internal Revenue Code. For fiscal year 2014, the Company matched 50% of the employee contributions up to 6% of the participant's contribution. The plan provides that employees' contributions are 100% vested at all times and, for fiscal year 2014, the Company's contributions vest at 20% each year after the second year of service. The expense related to the plan for the years ended December 31, 2014, 2013 and 2012 was $1.0 million, $0.9 million and $0.8 million, respectively.
	Effective January 1, 2015, the Company's match of participant contributions increased to 100% up to 3% of the participant's contributions and 50% on 4% and 5% of participant's contributions. In addition, the Company's contributions, both past and future, are immediately vested at 100%.
	Employment Agreements - The Company has entered into employment agreements with its chief executive officer and chief financial officer to ensure a stable and competent management base. The agreements provide for a three-year term, with an automatic one-year renewal on each anniversary date. The agreements provide for benefits as set forth in the contracts and cannot be terminated by the Board of Directors, except for cause, without prejudicing the officers’ rights to receive certain vested benefits, including compensation. In the event of a change in control of the Company, as outlined in the agreements, the acquiror will be bound to the terms of the contracts.
	Director and Executive Officer Benefit Plans - The Company has Salary Continuation Agreements and supplemental retirement benefits with its chief executive officer and certain other officers. The Salary Continuation Agreements provide for lifetime benefits to be paid to each executive with the payment amounts varying upon different retirement scenarios, such as normal retirement, early termination, disability, or change in control. The Company has purchased life insurance policies on the participating officers in order to provide future funding of benefit payments. Provisions for the years ended December 31, 2014, 2013 and 2012 totaled $0.4 million, $0.3 million and $0.6 million, respectively, were expensed for future benefits to be provided under these benefit plans. The corresponding liability related to these benefit plans was $7.4 million and $6.3 million as of December 31, 2014 and 2013, respectively.
	The Company also has a deferred compensation plan for its directors. Expense provided under the plan totaled $0.1 million, $0.4 million and $0.5 million for the years ended December 31, 2014, 2013 and 2012, respectively. Since 2003, directors have had the option to invest amounts deferred in Company common stock that is held in a rabbi trust established for that purpose. At December 31, 2014 and 2013, the trust held 353,207 and 339,448 shares of Company common stock, respectively.

Parent_Company_Financial_Data

Parent Company Financial Data	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Financial Data	PARENT COMPANY FINANCIAL DATA
	The following are condensed financial statements of the Parent Company as of and for the years ended December 31, 2014, 2013 and 2012 (dollars in thousands):
	CONDENSED BALANCE SHEETS
	December 31, 2014 and 2013
		31-Dec-14			31-Dec-13
	Assets
	Cash and due from banks	$	9,717		$	1,392
	Investment in bank subsidiary	462,659			320,941
	Investment in other subsidiaries	1,113			1,113
	Other assets	1,493			622
	Total assets	$	474,982		$	324,068
	Liabilities and shareholders' equity
	Other liabilities	$	881		$	150
	Long-term debt	83,713			52,588
	Total liabilities	84,594			52,738
	Shareholders' equity:
	Common stock, no par value	281,488			168,616
	Common stock, non-voting, no par value	33,507			57,849
	Retained earnings	65,211			41,559
	Stock in directors rabbi trust	(3,429		)	(3,143		)
	Directors deferred fees obligation	3,429			3,143
	Accumulated other comprehensive income	10,182			3,306
	Total shareholders' equity	390,388			271,330
	Total liabilities and shareholders' equity	$	474,982		$	324,068
	CONDENSED STATEMENTS OF INCOME
	Years Ended December 31, 2014, 2013 and 2012
		2014			2013			2012
	Dividends from bank subsidiary	$	29,612		$	13,760		$	3,675
	Equity in undistributed earnings of bank subsidiary	3,336			5,434			8,094
	Other income	647			625			626
	Interest expense	2,796			1,920			939
	Other expense	1,409			652			1,003
	Net income	$	29,390		$	17,247		$	10,453
	CONDENSED STATEMENTS OF CASH FLOWS
	Years Ended December 31, 2014, 2013 and 2012
		2014			2013			2012
	Operating activities
	Net income	$	29,390		$	17,247		$	10,453
	Adjustments to reconcile net income to net cash provided by operating activities:
	Equity in undistributed earnings of bank subsidiary	(3,336		)	(5,434		)	(8,094		)
	Amortization	452			48			11
	(Increase) decrease in other assets	(1,323		)	(472		)	2
	Increase (decrease) in other liabilities	828			(10,687		)	10,267
	Net cash provided by operating activities	26,011			702			12,639
	Investing activities
	Net cash used in investment in subsidiaries	(37,903		)	—			(61,397		)
	Financing activities
	Net increase (decrease) in short-term borrowings	—			—			(6,280		)
	Net increase in long-term debt	31,125			26,440			2,460
	Preferred stock issued (redeemed), net	—			(31,260		)	68,308
	Redemption of common stock warrant	—			—			(940		)
	Common stock issued from exercise of stock options	173			—			138
	Income tax benefit from exercise of stock options, net	—			—			17
	Common stock issued pursuant to dividend reinvestment plan	336			260			225
	Common stock repurchased	(5,081		)	—			—
	Common stock repurchased in lieu of income taxes	(598		)	—			—
	Cash dividends paid, net of accretion	(5,738		)	(5,853		)	(4,879		)
	Net cash provided by (used in) financing activities	20,217			(10,413		)	59,049
	Net increase (decrease) in cash and cash equivalents	8,325			(9,711		)	10,291
	Cash and cash equivalents, beginning of period	1,392			11,103			812
	Cash and cash equivalents, end of period	$	9,717		$	1,392		$	11,103

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
	The accompanying consolidated financial statements include the accounts and transactions of the Parent Company and BNC, collectively referred to herein as the “Company.” All significant intercompany transactions and balances have been eliminated in consolidation.
Use of Estimates	Use of Estimates
	The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“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.
Reclassifications	Reclassifications
	Certain amounts in the 2013 consolidated financial statements have been reclassified to conform to the 2014 presentation. The reclassifications had no effect on net income, net income available to common shareholders or shareholders' equity as previously reported.
Business Combinations	Business Combinations
	The Company accounts for its business combinations using the acquisition method of accounting. This method requires the use of fair values in determining the carrying values of the purchased assets and assumed liabilities, which are recorded at fair value at acquisition date, and identifiable intangible assets are recorded at fair value. Costs directly related to the business combinations are recorded as expenses as they are incurred. Fair values are subject to refinement for up to one year after the closing date of an acquisition as information relative to closing date fair values become available.
Cash and Cash Equivalents	Cash and Cash Equivalents
	For the purpose of presentation in the statements of cash flows, cash and cash equivalents include cash and due from banks and interest-earning deposits in other banks.
	Federal regulations require financial institutions to set aside a specified amount as a reserve against transaction accounts and time deposits. At December 31, 2014 and 2013, the Company’s reserve requirement was $12.1 million and $8.4 million, respectively.
Investment Securities	Investment Securities
	Investment securities are classified into one of three categories on the date of purchase and accounted for as follows: (1) debt securities that the Company has the positive intent and the ability to hold to maturity are classified as held-to-maturity and reported at amortized cost; (2) debt and equity securities that are bought and held principally for the purpose of selling them in the near term are classified as trading securities and reported at fair value, with unrealized gains and losses included in earnings; and (3) debt and equity securities not classified as either held-to-maturity securities or trading securities are classified as available-for-sale securities and reported at fair value, with unrealized gains and losses, net of taxes, reported as other comprehensive income.
	Premiums are amortized and discounts accreted using the interest method over the remaining terms of the related securities. Dividend and interest income are recognized when earned. Sales of investment securities are recorded at trade date, with realized gains and losses on sales determined using the specific identification method and included in non-interest income.
	Transfers of investment securities into the held-to-maturity category from the available-for-sale category are made at fair value at the date of transfer. The unrealized holding gain or loss at the date of transfer is retained in accumulated other comprehensive income and in the carrying value of the held-to-maturity securities. Such amounts are amortized over the remaining life of the security.
	Our investment securities portfolio includes residential mortgage-backed securities and collateralized mortgage obligations. As the underlying collateral of each of these securities is comprised of a large number of similar residential mortgage loans for which prepayments are probable and the timing and amount of such prepayments can be reasonably estimated, we consider estimates of future principal prepayments of these underlying residential mortgage loans in the calculation of the constant effective yield used to apply the interest method for income recognition.
	The Company evaluates securities for other-than-temporary impairment ("OTTI") on at least a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. For securities in an unrealized loss position,the Company considers the extent and duration of the unrealized loss, and the financial condition and near-term prospects of the issuer. The Company also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in the income statement and 2) other-than-temporary impairment (OTTI) related to other factors, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis. For equity securities, the entire amount of impairment is recognized through earnings.
Federal Home Loan Bank Stock	Federal Home Loan Bank Stock
	As a member of the Federal Home Loan Bank of Atlanta (the "FHLB"), the Company is required to maintain an investment in the stock of the FHLB based upon the amount of outstanding FHLB borrowings. This stock does not have a readily determinable fair value and is carried at cost.
Loans and Leases	Loans and Leases
	Originated Loans and Leases
	Loans that management has the intent and ability to hold for the foreseeable future or until maturity are reported at their outstanding principal balances, adjusted for any charge-offs, unearned discounts, and unamortized fees and costs on originated loans. Interest income on loans is accrued and credited to income based upon the principal amount outstanding. The net amount of nonrefundable loan origination fees and certain direct costs associated with the lending process are deferred and amortized to interest income over the contractual lives of the loans using methods that approximate the interest method.
	The Company classifies all loans and leases past due when the payment of principal and/or interest based upon contractual terms is greater than 30 days delinquent. When commercial loans are placed on nonaccrual status as described below, a charge-off is recorded, as applicable, to decrease the carrying value of such loans to the estimated fair value of the collateral securing the loan. Consumer loans are placed on nonaccrual status at a specified delinquency date consistent with regulatory guidelines. As such, consumer loans are subject to collateral valuation and charge-off, as applicable, when they are moved to nonaccrual status. The accrual of interest income for commercial loans is discontinued when there is a clear indication that the borrower’s cash flow may not be sufficient to meet payments as they become due, while the accrual of interest income for consumer loans is discontinued when loans reach specific delinquency levels.
	Acquired Loans
	Acquired loans are recorded at their fair value at the acquisition date. Credit discounts are included in the determination of fair value; therefore, an allowance for loan losses is not recorded at the acquisition date. Loans acquired in FDIC-assisted transactions and covered under loss-share agreements are referred to as “covered loans.”
	Acquired loans are evaluated upon acquisition and classified as either purchased impaired or purchased non-impaired. Purchased impaired loans reflect credit deterioration since origination such that it is probable at acquisition that the Company will be unable to collect all contractually required payments. For purchased impaired loans, expected cash flows at the acquisition date in excess of the fair value of loans are recorded as interest income over the life of the loans using a level yield method if the timing and amount of the future cash flows is reasonably estimable. Subsequent to the acquisition date, increases in cash flows over those expected at the acquisition date are recognized prospectively as interest income. Decreases in expected cash flows after the acquisition date are recognized immediately through the provision for loan losses. For purchased non-impaired loans, the difference between the fair value and unpaid principal balance of the loan at the acquisition date is amortized or accreted to interest income over the economic life of the loans using a method that approximates the interest method.
	Covered loans acquired will be reimbursed for a substantial portion of any future losses on them under the terms of the FDIC loss-share agreements. The covered loans are reported in loans exclusive of the expected reimbursement from the FDIC. Covered loans are initially recorded at fair value at the acquisition date. The covered loans are and will be subject to the Company’s internal and external credit review and monitoring. Prospective losses incurred on covered loans are eligible for partial reimbursement by the FDIC. Subsequent decreases in the amount expected to be collected result in a provision for loan losses, an increase in the allowance for loan losses, and a proportional increase to the FDIC indemnification asset for the estimated amount to be reimbursed. Subsequent increases in the amount expected to be collected result in the reversal of any previously-recorded provision for loan losses and related allowance for loan losses and decreases to the FDIC indemnification asset, or accretion of certain fair value amounts into interest income in future periods if no provision for loan losses had been recorded.
	Loans Held for Sale
	The Company originates certain single family, residential first mortgage loans for sale on a presold basis and these loans are classified as loans held for sale. Loans held for sale are carried at the lower of cost or estimated fair value in the aggregate as determined by outstanding commitments from investors. Upon closing, these loans, together with their servicing rights, are sold to other financial institutions under prearranged terms on a best-efforts basis. Gains or losses on loan sales are recognized at the time of sale and are determined by the difference between net sales proceeds and the principal balance of the loans sold, adjusted for net deferred loan fees or costs. Loan origination and commitment fees, net of certain direct loan origination costs, are deferred as an adjustment to the carrying value of the loan until it is sold. The commitments to sell loans and the commitments to originate loans held for sale at a set interest rate, if originated, are considered derivatives under GAAP. The impact of the estimated fair value adjustment was not significant to the consolidated financial statements.
	Nonperforming Loans
	The Company considers a loan impaired, based on current information and events, if it is probable that the Company will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. All impaired loans are measured based on the present value of the expected future cash flows discounted at the loan's effective interest rate, the loan's observable market price, or at the fair value of the collateral if the loan is collateral dependent.
	The Company uses several factors in determining if a loan is impaired. Internal asset classification procedures include a thorough review of significant loans and lending relationships and include the accumulation of related data. This data includes loan payment status and the borrowers' financial data, cash flows, operating income or loss, and other factors. These discounted cash flow analyses incorporate adjustments to future cash flows that reflect management’s best estimate based on a combination of historical experience and management judgment.
	Loans are generally classified as nonaccrual if they are past due as to maturity or payment of principal or interest for a period of more than ninety (90) days, unless such loans are well-secured and in the process of collection. If a loan or a portion of a loan is classified as doubtful or is partially charged off, the loan is generally classified as nonaccrual. Loans that are on a current payment status or past due less than ninety (90) days may also be classified as nonaccrual if repayment in full of principal and/or interest is in doubt.
	Loans may be returned to accrual status when all principal and interest amounts contractually due (including arrearages) are reasonably assured of repayment within an acceptable period of time and there is a sustained period of repayment performance (generally, a minimum of six months) by the borrower in accordance with the contractual terms of interest and principal.
	While a loan is classified as nonaccrual and the future collectability of the recorded loan balance is doubtful, collections of interest and principal are generally applied as a reduction to principal outstanding. When future collection of the recorded loan balance is expected, interest income may be recognized on a cash basis. In the case where a nonaccrual loan had been partially charged off, recognition of interest on a cash basis is limited to that which would have been recognized on the recorded loan balance at the contractual interest rate. Receipts in excess of that amount are recorded as recoveries to the allowance for loan losses until prior charge-offs have been fully recovered.
	Restructurings
	Modifications to a borrower’s debt agreement are considered troubled debt restructurings (“TDRs”) if a concession is granted for economic or legal reasons related to a borrower’s financial difficulties that otherwise would not be considered. TDRs are undertaken in order to improve the likelihood of recovery on the loan and may take the form of modifications made with the stated interest rate lower than the current market rate for new debt with similar risk, modifications to the terms and conditions of the loan that fall outside of normal underwriting policies and procedures, or a combination of these modifications. Modifications of covered and other acquired loans that are part of a pool accounted for as a single asset are not considered TDRs. TDRs can involve loans remaining on nonaccrual, moving to nonaccrual, or continuing on accruing status, depending on the individual facts and circumstances of the borrower.
Allowance for Loan and Lease Losses	Allowance for Loan and Lease Losses
	The allowance for loan losses is established through a provision for loan losses charged to expense. Loans are charged-off against the allowance when management believes that the collectability of principal is unlikely. Recoveries of amounts previously charged-off are credited to the allowance. The allowance is an amount that management believes will be adequate to absorb probable losses on existing loans based on evaluations of the collectibility of loans. The evaluations take into consideration such factors as changes in the nature and volume of the loan portfolio, overall portfolio quality, historical loan losses, review of specific loans for impairment, and current economic conditions and trends that may affect the borrowers' ability to pay. Accrual of interest is discontinued on loans when management believes, after considering economic and business conditions and collection efforts and the value of the underlying collateral, that the borrowers' financial condition is such that collection is doubtful.
	In addition, various regulatory agencies, as an integral part of their examination process, periodically review BNC’s allowance for loan losses. Such agencies may require BNC to recognize adjustments to the allowance based on their judgments of information available to them at the time of their examination.
	Accounting standards require the presentation of certain disclosure information at the portfolio segment level, which represents the level at which an entity develops and documents a systematic methodology to determine its allowance for loan losses. The Company concluded that its loan and lease portfolio comprises two portfolio segments; originated loans (which include purchased non-credit impaired loans) and purchased credit impaired loans. Originated loans include both commercial loans, which include commercial real estate, commercial construction, commercial and industrial and leases, and retail loans, which include residential construction, residential mortgage and consumer and other loans. The following provides a description of the Company’s accounting policies and methodologies related to each of its portfolio segments:
	Originated Loans
	All commercial and retail loans that are originated by the Company are assigned risk grades based on an assessment of conditions that affect the borrower’s ability to meet contractual obligations under the loan agreement. This process includes reviewing borrowers’ financial information, historical payment experience, credit documentation, public information, and other information specific to each borrower. Loans with outstanding balance of $1 million or more, as well as all other loans included in such relationships, are reviewed on an annual basis. Loans with total committed exposure of $250,000 or more that are risk graded as Special Mention or worse, as well as credit relationships with total credit exposure of $500,000 or more that are risk graded Special Mention or worse, are reviewed on a quarterly basis. All other loans are reviewed at any point management becomes aware of information affecting the borrower’s ability to fulfill their obligations. The Company calculates a specific reserve for each loan that has been deemed impaired, which include commercial loans 90 days or more past due, commercial nonaccrual loans above $250,000, and commercial and retail restructurings above $250,000. The amount of the reserve is based on the present value of expected cash flows discounted at the loan’s effective interest rate, and/or the value of collateral. If foreclosure is probable or the loan is collateral dependent, impairment is measured using the fair value of the loan’s collateral, less estimated costs to sell.
	As part of the Company’s ongoing assessment of the adequacy of the allowance for loan and lease losses, during the fourth quarter of 2014 the Company enhanced the methodology used in calculating the collective impairment reserve for homogeneous pools of non-impaired loans as of the balance sheet date, as well as impaired loans below the parameters described above. This enhancement included the incorporation of a detailed loss migration analysis using historical loss experience of 60 months, and changing the assumptions used in calculating loss reserve rates from two-year historical charge-offs to using probability of default, which is estimated based on the enhanced migration analysis, and loss-given default, which is based on historical net charge-off experience for each class of financing receivable during the loss experience period. Probability of default is based on risk grades for commercial loans and based on days past due for residential real estate and consumer loans. The Company also made changes to the qualitative factors used to provide a more objective and consistent result from quarter to quarter. The factors evaluated were not changed significantly but the manner in which the reserve is assigned is determined by objective evaluation of those factors and the number of those improving and declining. The enhancements did not have a material impact on the calculation of the allowance for loan and leases losses at December 31, 2014.
	For acquired loans that are not deemed credit impaired at acquisition, credit discounts representing the principal losses expected over the life of the loan are a component of the initial fair value. Subsequent to the purchase date, the methods utilized to estimate the required allowance for loan losses for these loans is similar to originated loans, however, the Company records a provision for loan losses only when the required allowance, net of any expected reimbursement under any loss-share agreements, exceeds any remaining credit discounts. The remaining differences between the purchase price and the unpaid principal balance at the date of acquisition are recorded in interest income over the economic life of the loans.
	Purchased Credit Impaired Loans
	The allowance for loan and lease losses related to purchased credit impaired loans is based on an analysis that is performed each period to estimate the expected cash flows for each of the loan pools. To the extent that the expected cash flows of a loan pool have decreased since the acquisition date, the Company establishes an allowance for loan losses.
Other Real Estate Owned	Other Real Estate Owned
	Other real estate owned (“OREO”) acquired through, or in lieu of, loan foreclosure is held for sale and is initially recorded at estimated fair value less cost of disposal at the date of foreclosure, establishing a new cost basis. When property is acquired, the excess, if any, of the loan balance over estimated fair value is charged to the allowance for loan losses. Subsequent to foreclosure, valuations are periodically performed by management and the assets are carried at the lower of carrying amount or fair value less cost to sell. Revenue and expenses from operations and changes in the valuation allowance are included in loan, foreclosure and other real estate owned expenses as a component of non-interest expense.
FDIC Indemnification Asset	FDIC Indemnification Asset
	The FDIC indemnification asset is measured separately from the related covered assets as it is not contractually embedded in the assets and is not transferable with the assets should the Company choose to dispose of them. At acquisition date of an FDIC-assisted transaction, fair value is estimated using projected cash flows related to the loss-share agreements based on the expected reimbursements for losses and the applicable loss-sharing percentages and the estimated true-up payment at the expiration of the loss-share agreements, if applicable. These cash flows were discounted to reflect the estimated timing of the receipt of the loss-share reimbursement from the FDIC and the true-up payment to the FDIC. Cash flow projections resulting from the loss-share agreements are reviewed and updated prospectively as loss estimates related to both covered loans and covered other real estate owned change, including the existence of and amount of any required true-up payment owed to the FDIC.
Premises and Equipment	Premises and Equipment
	Premises and equipment are stated at cost less accumulated depreciation and amortization. Land is carried at cost. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the respective assets, which are 40 years for buildings and 3 to 10 years for furniture, fixtures and equipment. Leasehold improvements are amortized over the terms of the respective leases or the estimated useful lives of the improvements, whichever is shorter. Repairs and maintenance costs are charged to operations as incurred.
Bank-Owned Life Insurance	Bank-Owned Life Insurance
	The Company has purchased life insurance policies on certain current and past key employees and directors where the insurance policy benefits and ownership are retained by the employer. These policies are recorded at their cash surrender value. Income from these policies and changes in the net cash surrender value are recorded in non-interest income as earnings on bank-owned life insurance. The cash value accumulation is permanently tax deferred if the policy is held to the insured person’s death and certain other conditions are met.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets
	Goodwill represents the excess of the purchase price over the fair value of net assets acquired in a business combination. Goodwill and intangible assets acquired in a purchase business combination and determined to have an indefinite useful life are not amortized, but tested for impairment at least annually or more frequently if events and circumstances exists that indicate that a goodwill impairment test should be performed. The Company has selected June 30 as the date to perform the annual impairment test. Intangible assets with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Goodwill is the only intangible asset with an indefinite life on our consolidated balance sheets.
	Other intangible assets consist of core deposit and acquired customer relationship intangible assets arising from whole bank and branch acquisitions are amortized on an accelerated method over their estimated useful lives, which range from seven to 10 years .
Derivatives	Derivatives
	The Company applies hedge accounting to certain interest rate derivatives entered into for risk management purposes. To qualify for hedge accounting, a derivative must be highly effective at reducing the risk associated with the exposure being hedged. In addition, key aspects of achieving hedge accounting are documentation of hedging strategy and hedge effectiveness at the hedge inception and substantiating hedge effectiveness on an ongoing basis. A derivative must be highly effective in accomplishing the hedge objective of offsetting changes in the cash flows of the hedged item for the risk being hedged. Any ineffectiveness in the hedge relationship is recognized in earnings. The effective portion of changes in the fair value of derivatives designated in a hedge relationship and that qualify as cash flow hedges is recorded in accumulated other comprehensive income, net of tax, and is subsequently reclassified into earnings in the period that the hedged transaction affects earnings.
	The Company formally documents the relationship between derivatives and hedged items, as well as the risk-management objective and the strategy for undertaking hedge transactions at the inception of the hedging relationship. This documentation includes linking cash flow hedges to specific assets and liabilities on the balance sheet or to specific firm commitments or forecasted transactions. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used are highly effective in offsetting changes in fair values or cash flows of the hedged items. The Company discontinues hedge accounting when it determines that the derivative is no longer effective in offsetting changes in the fair value or cash flows of the hedged item, the derivative is settled or terminates, a hedged forecasted transaction is no longer probable, a hedged firm commitment is no longer firm, or treatment of the derivative as a hedge is no longer appropriate or intended.
	When hedge accounting is discontinued, subsequent changes in fair value of the derivative are recorded as non-interest income. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transactions are still expected to occur, gains or losses that were accumulated in other comprehensive income are amortized into earnings over the same periods which the hedged transactions will affect earnings.
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 are excluded from the computation of dilutive earnings per share in the periods in which the effect would be anti-dilutive.
Income Taxes	Income Taxes
	Deferred income taxes are recognized for the tax consequences of temporary differences between financial statement carrying amounts and the tax bases of existing assets and liabilities that will result in taxable or deductible amounts in future years. These temporary differences are multiplied by the enacted income tax rate expected to be in effect when the taxes become payable or receivable. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date. Deferred tax assets are reduced, if necessary, by the amount of such benefits that are not expected to be realized based on available evidence.
Operating Segments	Operating Segments
	The Company’s operations are managed along two operating segments, consisting of banking operations and mortgage origination. While the chief operating decision maker uses financial information related to these segments to analyze business performance and allocate resources, the mortgage origination segment does not meet the quantitative threshold under GAAP to be considered a reportable segment. As such, these operating segments are aggregated into a single reportable operating segment in the Consolidated Financial Statements. No revenues are derived from foreign countries or from external customers that comprise more than 10% of the Company’s revenues.
Stock Compensation Plans	Stock Compensation Plans
	The Company follows the provisions of the authoritative guidance regarding share-based compensation. This guidance values share-based awards at the grant date fair value and recognizes the expense over the requisite service period.
Recently Adopted and Issued Accounting Standards	Recently Adopted and Issued Accounting Standards
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“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 Company does not expect the adoption of this ASU to have a material impact on its consolidated financial statements.
	In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, to provide guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists thereby reducing diversity in practice. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. Early adoption is permitted. The amendments are to be applied prospectively to all unrecognized tax benefits that exist at the effective date with retrospective application permitted. The adoption of this ASU did not have a material impact on the Company's consolidated financial statements.

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2014
Business Acquisition [Line Items]
Pro Forma Information	The following table presents financial information regarding the former Harbor, Community First and South Street operations included in our Consolidated Statements of Income from the date of acquisition through December 31, 2014 under the column “Actual from acquisition date through December 31, 2014”. These amounts do not include direct costs as explained above. In addition, the following table presents unaudited pro forma information as if the acquisitions of Harbor, Community First and South Street had occurred on January 1, 2013 under the “Pro forma” columns. This pro forma information gives effect to certain adjustments, including purchase accounting fair value adjustments, amortization of core deposit and other intangibles and related income tax effects and is based on our historical results for the periods presented. Transaction-related costs related to the acquisition are not reflected in the pro forma amounts. The pro forma information does not necessarily reflect the results of operations that would have occurred had the Company acquired Harbor, Community First and South Street at the beginning of 2013. Cost savings are also not reflected in the unaudited pro forma amounts for years ended December 31, 2014 and 2013, respectively (dollars in thousands).
		Actual from Acquisition Date through December 31,			Pro Forma for the Year Ended December 31,
		2014			2014				2013
	Net interest income	$	13,488		$	156,650			$	141,778
	Non-interest income	571			29,795				28,363
	Net income	5,661			31,585				21,811
	Net income available to common shareholders	5,661			31,585				10,751
	Pro forma earnings per share:
	Basic				$	0.97			$	0.65
	Diluted				$	0.96			$	0.65
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 (dollars in thousands):
	Assets	As Recorded by			Fair				As Recorded
		Community First			Value Adjustments				by BNC
	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 (dollars in thousands):
	Assets	As Recorded by Harbor			Fair				As Recorded
					Value Adjustments				by BNC
	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 (dollars in thousands):
	Assets	As Recorded by			Fair				As Recorded
		South Street			Value Adjustments				by BNC
	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
Randolph Bank and Trust
Business Acquisition [Line Items]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	A summary of assets received and liabilities assumed for Randolph, as well as the associated fair value adjustments, are as follows (dollars in thousands):
	Assets	As Recorded by			Fair				As Recorded
		Randolph			Value Adjustments				by BNC
	Cash and due from banks	$	14,207		$	—			$	14,207
	Investment securities available-for-sale	5,082			130			-1	5,212
	Federal Home Loan Bank stock, at cost	630			—				630
	Loans	161,220			(6,973		)	-2	154,247
	Premises and equipment	4,537			811			-3	5,348
	Accrued interest receivable	800			—				800
	Other real estate owned	4,844			(626		)	-4	4,218
	Core deposit intangible	—			2,676			-5	2,676
	Other assets	92,289			1,744			-6	94,033
	Total assets acquired	$	283,609		$	(2,238	)		281,371
	Liabilities
	Deposits	$	(260,484	)	$	(523	)	-7	(261,007		)
	Borrowings	(6,100		)	(209		)	-8	(6,309		)
	Other liabilities	(1,291		)	—				(1,291		)
	Total liabilities assumed	$	(267,875	)	$	(732	)		(268,607		)
	Net assets acquired								12,764
	Total consideration paid								14,037
	Goodwill								$	1,273
	Explanation of fair value adjustments:
	-1	Adjustment for the fair value of the investment securities portfolio.
	-2	Adjustment for the fair value of the loan portfolio.
	-3	Adjustment for the fair value of premises and equipment.
	-4	Adjustment for the fair value of other real estate owned.
	-5	Adjustment for the fair value of the core deposit intangible.
	-6	Adjustment for the deferred tax asset recognized from acquisition.
	-7	Adjustment for the fair value of time deposits.
	-8	Adjustment for the fair value of borrowings.
	A summary of the consideration paid is as follows (dollars in thousands):
	Common stock issued (726,634 shares)	$	9,642
	Redemption of preferred stock	2,300
	Cash payments to common stockholders	2,095
	Total consideration paid	$	14,037

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
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 (dollars in thousands, except per share data):
		Year Ended December 31,
		2014		2013		2012
	Net income available to common shareholders	$	29,390	$	16,187	$	8,049
	Add: Convertible preferred stock dividends	—		—		361
	Net income available to participating common shareholders	$	29,390	$	16,187	$	8,410
	Weighted average common shares - basic	29,049,525		26,495,211		15,790,448
	Add: Effect of convertible preferred stock	—		187,873		1,804,566
	Weighted average participating common shares - basic	29,049,525		26,683,084		17,595,014
	Effects of dilutive Stock Rights	102,352		31,090		4,204
	Weighted average participating common shares - diluted	29,151,877		26,714,174		17,599,218
	Basic earnings per common share	$	1.01	$	0.61	$	0.48
	Diluted earnings per common share	$	1.01	$	0.61	$	0.48

Investment_Securities_Tables

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2014
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 (dollars in thousands):
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
	31-Dec-14
	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
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
	31-Dec-13
	Available-for-sale:
	U.S. Government agencies	$	15,720			$	4			$	663			$	15,061
	State and municipals	194,224				2,704				5,665				191,263
	Corporate debt securities	9,011				16				138				8,889
	Other debt securities	4,727				—				347				4,380
	Equity securities	979				—				57				922
	Mortgage-backed securities:
	Residential government sponsored	41,231				1,442				659				42,014
	Other government sponsored	7,615				276				3				7,888
		$	273,507			$	4,442			$	7,532			$	270,417
	Held-to-maturity:
	State and municipals	$	221,378			$	379			$	10,169			$	211,588
	Corporate debt securities	16,000				—				1,081				14,919
	Other debt securities	10,000				—				—				10,000
		$	247,378			$	379			$	11,250			$	236,507
Investments Classified by Contractual Maturity Date	The amortized cost and estimated fair value of investment securities at December 31, 2014, by contractual maturity, are shown below (dollars in thousands). 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
	Available-for-sale:
	Due within one year	$	10,853			$	10,851
	Due after one through five years	6,692				6,733
	Due after five through ten years	18,976				19,171
	Due after ten years	215,372				226,626
	Total debt securities	251,893				263,381
	Equity securities	6,145				5,909
		$	258,038			$	269,290
	Held-to-maturity:
	Due after one year through five years	$	17,155			$	16,600
	Due after five through ten years	22,784				22,858
	Due after ten years	197,153				202,539
		$	237,092			$	241,997
Schedule of Realized Gain (Loss)	The following table presents a summary of realized gains and losses from the sale of investment securities (dollars in thousands):
		Year Ended December 31,
		2014				2013				2012
	Proceeds from sales	$	49,297			$	18,414			$	117,381
	Gross realized gains on sales	$	481			$	201			$	3,117
	Gross realized losses on sales	(992		)		(243		)		(91		)
	Total realized gains (losses), net	$	(511	)		$	(42	)		$	3,026
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 (dollars in thousands):
		Less Than 12 Months											12 Months or More							Total
	31-Dec-14	Number of Securities			Fair Value				Unrealized Losses				Number of Securities			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	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
		Less Than 12 Months											12 Months or More							Total
	31-Dec-13	Number of Securities			Fair Value				Unrealized Losses				Number of Securities			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	Available-for-sale:
	U.S. Government agencies	5			$	14,583			$	663			—			$	—	$	—	$	14,583	$	663
	State and municipals	47			72,821				3,647				21			27,976		2,018		100,797		5,665
	Corporate debt securities	2			7,862				138				—			—		—		7,862		138
	Other debt securities	1			4,380				347				—			—		—		4,380		347
	Equity securities	1			922				57				—			—		—		922		57
	Mortgage-backed securities	15			14,146				444				4			4,582		218		18,728		662
		71			$	114,714			$	5,296			25			$	32,558	$	2,236	$	147,272	$	7,532
	Held-to-maturity:
	State and municipals	150			$	162,565			$	8,325			25			$	28,238	$	1,844	$	190,803	$	10,169
	Corporate debt securities	1			4,939				61				1			2,980		1,020		7,919		1,081
		151			$	167,504			$	8,386			26			$	31,218	$	2,864	$	198,722	$	11,250

Loans_and_Allowance_for_Loan_L1

Loans and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Schedule of Financing Receivables Originated and Acquired	Major categories of loans are presented below (dollars in thousands):
		December 31,
		2014												2013
		Originated				Acquired (1)				Total				Originated			Acquired (1)				Total
	Commercial real estate	$	1,181,492			$	403,672			$	1,585,164			$	1,014,633		$	318,023			$	1,332,656
	Commercial construction	265,968				48,668				314,636				202,140			42,420				244,560
	Commercial and industrial	154,132				38,200				192,332				139,567			29,372				168,939
	Leases	21,100				—				21,100				16,137			—				16,137
	Total commercial	1,622,692				490,540				2,113,232				1,372,477			389,815				1,762,292
	Residential construction	43,298				29,854				73,152				29,636			2,798				32,434
	Residential mortgage	439,600				432,818				872,418				294,660			173,263				467,923
	Consumer and other	10,851				5,445				16,296				8,103			5,765				13,868
		$	2,116,441			$	958,657			$	3,075,098			$	1,704,876		$	571,641			$	2,276,517
	-1	Amount includes $137.5 million and $187.7 million of acquired loans covered under FDIC loss-share agreements at December 31, 2014 and 2013, respectively. The unpaid principal balance for acquired loans covered under FDIC loss-share agreements was $140.4 million and $195.4 million at December 31, 2014 and 2013, 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 (dollars in thousands):
		Year Ended December 31,
		2014								2013
		Accretable Yield				Carrying Value				Accretable Yield				Carrying Value
	Balance at beginning of period	$	(6,058	)		$	187,661			$	(12,895	)		$	248,930
	Reductions from payments and foreclosures, net	—				(54,489		)		—				(70,042		)
	Reclass from non-accretable to accretable yield	(221		)		221				(968		)		968
	Accretion	4,066				4,066				7,805				7,805
	Balance at end of period	$	(2,213	)		$	137,459			$	(6,058	)		$	187,661
Schedule of Changes in Accretable Yield and Carrying Value of Covered Acquired Loans	The following table presents loans acquired during the year ended December 31, 2014, at acquisition date, accounted for under ASC Topic 310-30 (dollars in thousands):
	Contractually required payments receivable	$	45,349
	Contractual cash flows not expected to be collected (non-accretable)	(8,674		)
	Expected cash flows	36,675
	Interest component of expected cash flows	(3,930		)
	Fair value of loans acquired	$	32,745
Schedule of Related Party Transactions	Loans to principal officers, directors, and their affiliates during 2014 were as follows:
	Balance at beginning of year	$	6,463
	Additional borrowings	20,766
	Loan repayments	-21,933
	Balance at end of year	$	5,296
Schedule of Allowance for Loan and Lease Losses [Table Text Block]	A summary of the changes to the allowance for loan losses is presented below (dollars in thousands):
		Year Ended December 31,
		2014				2013				2012
	Beginning balance	$	32,875			$	40,292			$	31,008
	Provision for credit losses	7,006				12,188				22,737
	Change in FDIC indemnification asset	(1,575		)		1,084				17,711
	Charge-offs	(14,636		)		(28,428		)		(34,710		)
	Recoveries	6,729				7,739				3,546
	Ending balance	$	30,399			$	32,875			$	40,292
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, for the years ended December 31, 2014 and 2013 is presented below (dollars in thousands):
	2014		Commercial real estate				Commercial construction				Commercial and industrial				Leases			Residential construction				Residential Mortgage				Consumer and other			Total
	Allowance for loan losses:
	Balance December 31, 2013		$	14,752			$	6,738			$	3,137			$	56		$	213			$	7,730			$	249		$	32,875
	Charge-offs		(3,339		)		(3,483		)		(3,279		)		—			—				(4,344		)		(191		)	(14,636		)
	Recoveries		1,289				1,830				1,205				—			70				2,196				139			6,729
	Provision (1)		412				(155		)		2,281				47			293				4,161				(33		)	7,006
	Change in FDIC indemnification asset (1)		(429		)		(619		)		(118		)		—			(6		)		(430		)		27			(1,575		)
	Balance December 31, 2014		$	12,685			$	4,311			$	3,226			$	103		$	570			$	9,313			$	191		$	30,399
	2013		Commercial real estate				Commercial construction				Commercial and industrial				Leases			Residential construction				Residential Mortgage				Consumer and other			Total
	Allowance for loan losses:
	Balance December 31, 2012		$	15,718			$	9,807			$	3,578			$	18		$	593			$	10,441			$	137		$	40,292
	Charge-offs		(5,492		)		(9,519		)		(3,442		)		—			—				(9,598		)		(377		)	(28,428		)
	Recoveries		1,525				2,712				1,721				—			58				1,696				27			7,739
	Provision (2)		5,084				1,879				1,017				38			(412		)		4,224				358			12,188
	Change in FDIC indemnification asset (2)		(2,083		)		1,859				263				—			(26		)		967				104			1,084
	Balance December 31, 2013		$	14,752			$	6,738			$	3,137			$	56		$	213			$	7,730			$	249		$	32,875
	-1	The provision for loan losses includes the "net" provision on covered loans after coverage provided by FDIC loss-share agreements, which totaled $(0.6) million for the year ended December 31, 2014. This resulted in a decrease in the FDIC indemnification asset of $1.6 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 $2.2 million for the year ended December 31, 2014.
	-2	The provision for loan losses includes the "net" provision on covered loans after coverage provided by FDIC loss-share agreements, which totaled $0.6 million for the year ended December 31, 2013. This resulted in an increase in the FDIC indemnification asset of $1.1 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 $1.7 million for the year ended December 31, 2013.
	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
	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
	Balances at December 31, 2013:
	Specific reserves:
	Impaired loans		$	3,209			$	1,595			$	43			$	—		$	35			$	1,361			$	10		$	6,253
	Purchase credit impaired loans		2,979				691				552				—			—				1,833				23			6,078
	Total specific reserves		6,188				2,286				595				—			35				3,194				33			12,331
	General reserves		8,564				4,452				2,542				56			178				4,536				216			20,544
	Total		$	14,752			$	6,738			$	3,137			$	56		$	213			$	7,730			$	249		$	32,875
	Loans:
	Individually evaluated for impairment		$	33,950			$	12,877			$	1,525			$	—		$	356			$	14,037			$	165		$	62,910
	Purchase credit impaired loans		100,290				18,460				6,649				—			16				50,825				1,917			178,157
	Loans collectively evaluated for impairment		1,198,416				213,223				160,765				16,137			32,062				403,061				11,786			2,035,450
	Total		$	1,332,656			$	244,560			$	168,939			$	16,137		$	32,434			$	467,923			$	13,868		$	2,276,517
Schedule Of Impaired Loans	The following tables present information related to impaired loans, excluding purchased impaired loans (dollars in thousands):
		Impaired Loans - With Allowance												Impaired Loans - With No Allowance
	31-Dec-14	Recorded Investment				Unpaid Principal Balance				Allowances for Loan Losses Allocated				Recorded Investment			Unpaid Principal Balance
	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 (non-covered):
	Commercial real estate	429				428				43				—			—
	Commercial construction	133				132				13				42			41
	Commercial and industrial	204				203				16				1			—
	Residential construction	308				308				185				114			114
	Residential mortgage	1,574				1,614				279				2,869			3,338
	Total acquired (non-covered)	2,648				2,685				536				3,026			3,493
	Acquired (covered):
	Commercial real estate	—				—				—				796			824
	Commercial construction	—				—				—				427			426
	Commercial and industrial	—				—				—				—			28
	Residential mortgage	—				—				—				4,397			4,406
	Total acquired (covered)	—				—				—				5,620			5,684
	Total loans	$	22,045			$	22,027			$	2,989			$	33,293		$	33,782
		Impaired Loans - With Allowance												Impaired Loans - With No Allowance
	31-Dec-13	Recorded Investment				Unpaid Principal Balance				Allowances for Loan Losses Allocated				Recorded Investment			Unpaid Principal Balance
	Originated:
	Commercial real estate	$	16,261			$	16,228			$	3,164			$	17,129		$	17,116
	Commercial construction	7,239				7,218				1,582				5,536			5,902
	Commercial and industrial	934				932				42				3			—
	Residential construction	357				355				35				—			—
	Residential mortgage	8,529				8,513				1,333				3,719			3,699
	Consumer and other	104				104				10				37			37
	Total originated	33,424				33,350				6,166				26,424			26,754
	Acquired (non-covered):
	Commercial real estate	490				489				45				557			565
	Commercial construction	142				141				14				—			—
	Commercial and industrial	185				185				1				406			648
	Residential mortgage	636				636				27				1,236			1,528
	Consumer and other	—				—				—				24			21
	Total acquired (non-covered)	1,453				1,451				87				2,223			2,762
	Acquired (covered):
	Commercial real estate	—				—				—				173			183
	Commercial construction	—				—				—				400			414
	Commercial and industrial	—				—				—				3			35
	Residential mortgage	—				—				—				5,788			5,877
	Total acquired (covered)	—				—				—				6,364			6,509
	Total loans	$	34,877			$	34,801			$	6,253			$	35,011		$	36,025
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 (dollars in thousands):
		Year Ended December 31,
		2014								2013
		Average Recorded Investment				Interest Income Recognized				Average Recorded Investment				Interest Income Recognized
	Impaired loans with allowance:
	Commercial real estate	$	16,618			$	584			$	20,205			$	839
	Commercial construction	2,498				104				6,700				246
	Commercial and industrial	1,190				23				499				28
	Residential construction	407				26				367				12
	Residential mortgage	7,119				102				11,074				381
	Consumer and other	134				6				23				—
	Total impaired loans with allowance	$	27,966			$	845			$	38,868			$	1,506
	Impaired loans with no allowance:
	Commercial real estate	$	15,658			$	445			$	12,724			$	600
	Commercial construction	6,266				275				8,192				346
	Commercial and industrial	156				—				592				30
	Residential construction	113				6				—				—
	Residential mortgage	12,376				481				10,614				357
	Consumer and other	29				—				40				—
	Total impaired loans with no allowance	$	34,598			$	1,207			$	32,162			$	1,333
Aging of Financing Receivables	The following tables present an aging analysis of the recorded investment in the Company's loans (dollars in thousands):
	31-Dec-14	30-59 Days Past Due				60-89 Days Past Due				Greater than 90 Days Past Due				Non-Accrual			Total Past Due				Current				Total Loans
	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 (non-covered):
	Commercial real estate	291				155				—				433			879				330,135				331,014
	Commercial construction	191				33				—				42			266				37,980				38,246
	Commercial and industrial	73				—				—				52			125				34,266				34,391
	Residential construction	—				—				—				422			422				29,432				29,854
	Residential mortgage	1,946				848				—				4,239			7,033				376,087				383,120
	Consumer and other	66				2				—				—			68				4,505				4,573
	Total acquired (non-covered)	2,567				1,038				—				5,188			8,793				812,405				821,198
	Acquired (covered):
	Commercial real estate	589				—				—				4,075			4,664				67,994				72,658
	Commercial construction	39				34				—				737			810				9,612				10,422
	Commercial and industrial	48				27				—				145			220				3,589				3,809
	Residential mortgage	254				—				—				6,073			6,327				43,371				49,698
	Consumer and other	26				—				—				30			56				816				872
	Total acquired (covered)	956				61				—				11,060			12,077				125,382				137,459
	Total loans	$	7,325			$	2,391			$	—			$	24,723		$	34,439			$	3,040,659			$	3,075,098
	31-Dec-13	30-59 Days Past Due				60-89 Days Past Due				Greater than 90 Days Past Due				Non-Accrual			Total Past Due				Current				Total Loans
	Originated:
	Commercial real estate	$	353			$	—			$	—			$	6,044		$	6,397			$	1,008,236			$	1,014,633
	Commercial construction	14				20				—				2,801			2,835				199,305				202,140
	Commercial and industrial	533				10				—				245			788				138,779				139,567
	Leases	—				—				—				—			—				16,137				16,137
	Residential construction	—				—				—				—			—				29,636				29,636
	Residential mortgage	1,417				248				—				5,102			6,767				287,893				294,660
	Consumer and other	—				—				—				37			37				8,066				8,103
	Total originated	2,317				278				—				14,229			16,824				1,688,052				1,704,876
	Acquired (non-covered):
	Commercial real estate	116				—				—				605			721				220,850				221,571
	Commercial construction	50				—				—				—			50				24,039				24,089
	Commercial and industrial	—				5				—				591			596				22,857				23,453
	Residential construction	—				—				—				—			—				2,782				2,782
	Residential mortgage	950				514				—				1,665			3,129				105,110				108,239
	Consumer and other	108				1				—				24			133				3,713				3,846
	Total acquired (non-covered)	1,224				520				—				2,885			4,629				379,351				383,980
	Acquired (covered):
	Commercial real estate	1,145				848				—				8,086			10,079				86,373				96,452
	Commercial construction	201				38				—				5,111			5,350				12,981				18,331
	Commercial and industrial	—				47				—				640			687				5,232				5,919
	Residential construction	—				—				—				—			—				16				16
	Residential mortgage	313				28				—				9,818			10,159				54,865				65,024
	Consumer and other	8				2				—				90			100				1,819				1,919
	Total acquired (covered)	1,667				963				—				23,745			26,375				161,286				187,661
	Total loans	$	5,208			$	1,761			$	—			$	40,859		$	47,828			$	2,228,689			$	2,276,517
Financing Receivable Credit Quality Indicators	The following tables present the recorded investment in the Company’s loans by credit quality indicator (dollars in thousands):
	31-Dec-14	Total				Pass				Special Mention				Substandard			Doubtful				Loss
	Originated:
	Commercial real estate	$	1,181,492			$	1,100,361			$	46,935			$	34,196		$	—			$	—
	Commercial construction	265,968				256,987				5,530				3,451			—				—
	Commercial and industrial	154,132				145,722				3,980				4,430			—				—
	Leases	21,100				21,100				—				—			—				—
	Residential construction	43,298				42,806				143				349			—				—
	Residential mortgage	439,600				407,319				20,946				11,335			—				—
	Consumer and other	10,851				10,331				428				92			—				—
	Total originated	2,116,441				1,984,626				77,962				53,853			—				—
	Total acquired (non-covered):
	Commercial real estate	331,014				295,238				23,456				12,320			—				—
	Commercial construction	38,246				29,975				5,258				3,013			—				—
	Commercial and industrial	34,391				32,757				477				1,157			—				—
	Residential construction	29,854				28,833				—				1,021			—				—
	Residential mortgage	383,120				341,268				26,063				15,548			241				—
	Consumer and other	4,573				4,494				79				—			—				—
	Total acquired (non-covered):	821,198				732,565				55,333				33,059			241				—
	Acquired (covered):
	Commercial real estate	72,658				47,002				12,360				13,211			85				—
	Commercial construction	10,422				6,371				652				3,307			92				—
	Commercial and industrial	3,809				3,282				167				325			35				—
	Residential mortgage	49,698				29,255				10,035				9,068			1,340				—
	Consumer and other	872				762				80				30			—				—
	Total acquired (covered)	137,459				86,672				23,294				25,941			1,552				—
	Total loans	$	3,075,098			$	2,803,863			$	156,589			$	112,853		$	1,793			$	—
	31-Dec-13	Total				Pass Credits				Special Mention				Substandard			Doubtful				Loss
	Originated:
	Commercial real estate	$	1,014,633			$	930,554			$	37,685			$	46,394		$	—			$	—
	Commercial construction	202,140				175,365				13,113				13,662			—				—
	Commercial and industrial	139,567				131,658				5,411				2,498			—				—
	Leases	16,137				16,137				—				—			—				—
	Residential construction	29,636				28,160				1,120				356			—				—
	Residential mortgage	294,660				258,042				19,234				17,384			—				—
	Consumer and other	8,103				7,807				177				119			—				—
	Total originated	1,704,876				1,547,723				76,740				80,413			—				—
	Acquired (non-covered):
	Commercial real estate	221,571				195,526				17,343				8,702			—				—
	Commercial construction	24,089				21,126				922				2,041			—				—
	Commercial and industrial	23,453				18,681				3,328				1,444			—				—
	Residential construction	2,782				2,782				—				—			—				—
	Residential mortgage	108,239				91,847				10,766				5,626			—				—
	Consumer and other	3,846				3,760				62				24			—				—
	Total acquired (non-covered)	383,980				333,722				32,421				17,837			—				—
	Acquired (covered):
	Commercial real estate	96,452				61,091				12,831				17,929			4,601				—
	Commercial construction	18,331				9,756				1,397				6,751			427				—
	Commercial and industrial	5,919				4,231				796				332			560				—
	Residential construction	16				—				16				—			—				—
	Residential mortgage	65,024				36,744				13,246				10,296			4,738				—
	Consumer and other	1,919				1,726				103				90			—				—
	Total acquired (covered)	187,661				113,548				28,389				35,398			10,326				—
	Total loans	$	2,276,517			$	1,994,993			$	137,550			$	133,648		$	10,326			$	—
Troubled Debt Restructurings on Financing Receivables	The following tables provide a summary of loans modified as TDRs (dollars in thousands):
		Accrual				Nonaccrual				Total TDRs				Allowance for Loan Losses Allocated
	31-Dec-14
	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
	Total contracts	33				2				35
		Accrual				Nonaccrual				Total TDRs				Allowance for Loan Losses Allocated
	31-Dec-13
	Commercial real estate	$	3,986			$	1,107			$	5,093			$	767
	Commercial construction	5,472				274				5,746				520
	Commercial and industrial	662				—				662				36
	Residential mortgage	6,545				625				7,170				476
	Consumer and other	105				37				142				11
	Total modifications	$	16,770			$	2,043			$	18,813			$	1,810
	Total contracts	43				10				53
New Troubled Debt Restructurings By Modification Category	The following tables present new TDRs by modification category (dollars in thousands). All balances represent the recorded investment at the end of the period in which the modification was made.
		Year Ended December 31, 2014
		Term Modification				Interest only Modification				Payment Modification				Combination Modification			Total Modifications
	Commercial real estate	$	—			$	—			$	1,300			$	—		$	1,300
	Commercial construction	—				447				—				—			447
	Commercial and industrial	153				—				—				—			153
	Residential mortgage	—				479				—				755			1,234
	Consumer and other	—				—				10				—			10
	Total modifications	$	153			$	926			$	1,310			$	755		$	3,144
		Year Ended December 31, 2013
		Rate Modification				Term Modification				Interest only Modification				Combination Modification			Total Modifications
	Commercial real estate	$	101			$	648			$	331			$	1,035		$	2,115
	Commercial construction	128				—				152				827			1,107
	Commercial and industrial	—				129				536				—			665
	Residential mortgage	452				84				1,076				573			2,185
	Consumer and other	—				23				—				—			23
	Total modifications	$	681			$	884			$	2,095			$	2,435		$	6,095
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 (dollars in thousands). The Company defines payment default as movement of the restructuring to nonaccrual status, foreclosure or charge-off, whichever occurs first.
		Year Ended December 31,
		2014				2013
	Commercial real estate	$	1,210			$	—
	Commercial construction	1,245				5,906
	Commercial and industrial	—				29
	Residential construction	—				630
	Residential mortgage	129				688
Loan Sale Activity On Single Family Residential First Mortgage Loans Originated For Sale On A Presold Basis	Loan sale activity is summarized below (dollars in thousands):
		Year Ended December 31,
		2014				2013				2012
	Loans held for sale	$	37,280			$	30,899			$	57,414
	Proceeds from sales of loans held for sale	292,497				352,130				233,276
	Mortgage fees	7,689				8,979				6,169

FDIC_Indemnification_Asset_Tab

FDIC Indemnification Asset (Tables)	12 Months Ended
	Dec. 31, 2014
FDIC Indemnification Asset [Abstract]
FDIC Indemnification Asset Roll Forward	The following table presents activity for the FDIC indemnification asset (dollars in thousands):
		Year Ended December 31,
		2014			2013
	Balance at beginning of period	$	16,886		$	53,519
	Accretion of present value discount, net	1,061			192
	Post-acquisition adjustments	(2,920		)	(2,248		)
	Receipt of payments from FDIC	(9,930		)	(34,577		)
	Balance at end of period	$	5,097		$	16,886

Goodwill_and_Other_Intangibles1

Goodwill and Other Intangibles (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill	The following table presents activity for goodwill and other intangible assets for the years ended December 31, 2014 and 2013 (dollars in thousands):
		Goodwill			Other Intangibles			Total
	Balance at December 31, 2012	$	27,111		$	5,082		$	32,193
	Acquisitions	1,273			2,676			3,949
	Amortization	—			(1,176		)	(1,176		)
	Balance at December 31, 2013	28,384			6,582			34,966
	Acquisitions	41,365			9,710			51,075
	Amortization	—			(2,340		)	(2,340		)
	Balance at December 31, 2014	$	69,749		$	13,952		$	83,701
Schedule of Finite-Lived Intangible Assets	The following table presents the gross carrying amount and accumulated amortization for the Company’s core deposit intangible assets, which are the only identifiable intangible assets subject to amortization (dollars in thousands):
		December 31,
		2014			2013
	Gross carrying amount	$	19,624		$	9,914
	Accumulated amortization	(5,672		)	(3,332		)
	Net book value	$	13,952		$	6,582
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The following table presents estimated future amortization expense for other intangible assets (dollars in thousands):
	2015	$	3,148
	2016	2,639
	2017	2,361
	2018	2,361
	2019	2,035
	Thereafter	1,408
	Total	$	13,952

Premises_and_Equipment_Tables

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Premises and Equipment [Abstract]
Property, Plant and Equipment	The following tables present a summary of the Company’s premises and equipment (dollars in thousands):
		December 31,
		2014			2013
	Land	$	26,397		$	23,264
	Buildings and leasehold improvements	60,188			49,689
	Furniture, fixtures and equipment	23,161			20,290
	Construction in progress	114			178
	Premises and equipment, gross	109,860			93,421
	Less accumulated depreciation and amortization	(22,099		)	(17,295		)
	Premises and equipment, net	$	87,761		$	76,126
Operating Leases of Lessee Disclosure	At December 31, 2014, future minimum rental commitments under non-cancellable operating leases that have a remaining life in excess of one year are as follows (dollars in thousands):
	2015	$	4,002
	2016	3,481
	2017	3,064
	2018	2,818
	2019	2,461
	Thereafter	6,843
	Total	$	22,669

Derivatives_Tables

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Derivatives	The following table presents the fair value of the Company’s derivatives (dollars in thousands):
		31-Dec-14									31-Dec-13
		Notional Amount			Balance Sheet Location		Fair Value				Notional Amount				Balance Sheet Location	Fair Value
	Derivative assets:
	Derivatives designated as hedging instruments:
	Interest rate cap	N/A			N/A		N/A				$	250,000			Other assets	$	—
	Interest rate swap	$	—		Other assets		$	—			125,000				Other assets	2,744
		$	—				$	—			$	375,000				$	2,744
	Derivatives not designated as hedging instruments:
	Interest rate swaps	$	34,692		Other assets		$	723			$	27,965			Other assets	$	424
	Interest rate cap/floor	—			Other assets		—				3,256				Other assets	98
		$	34,692				$	723			$	31,221				$	522
	Derivative liabilities:
	Derivatives designated as hedging instruments:
	Interest rate swap	$	125,000		Accrued expenses and other liabilities		$	308			$	—			Accrued expenses and other liabilities	$	—
	Derivatives not designated as hedging instruments:
	Interest rate swaps	$	34,692		Accrued expenses and other liabilities		$	723			$	31,221			Accrued expenses and other liabilities	$	522
Offsetting Assets And Liabilities	Information about financial instruments that are eligible for offset in the consolidated balance sheets is presented in the following table (dollar amounts in thousands):
													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
	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
	31-Dec-13
	Derivative assets	$	3,266		$	—			$	3,266			$	—		$	930	$	2,336
	Derivative liabilities	522			—				522				—			522		—
	Total derivative instruments	$	3,788		$	—			$	3,788			$	—		$	1,452	$	2,336
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 (dollars in thousands, net of tax):
		Year Ended December 31,
		2014			2013				2012
	Derivatives designated as hedging instruments:
	Amount of net gains (losses) recorded in OCI (effective portion)	$	(1,923	)	$	1,662			$	(364	)
	Amount of net losses reclassified from OCI to earnings (1)	286			6,103				4,878
	(1) Amount recorded in interest expense on demand deposits in the Consolidated Statements of Income

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2014
Deposits [Abstract]
Maturities of Time Deposits	The following tables present the scheduled maturities of time deposits at December 31, 2014 (dollars in thousands):
		Less than $100,000		$100,000 and Greater		Total
	2015	$	250,746	$	495,177	$	745,923
	2016	42,616		112,698		155,314
	2017	28,946		119,384		148,330
	2018	13,442		108,462		121,904
	2019	4,332		26,501		30,833
	Thereafter	103		1,267		1,370
	Total	$	340,185	$	863,489	$	1,203,674

Borrowings_Tables

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Subordinated Borrowings	The following tables detail the junior subordinated debentures outstanding (dollars in thousands):
		Date of issuance		Shares issued		Interest rate		Maturity date		December 31,
										2014			2013
	BNC Bancorp Capital Trust I	4/3/03		5,000		Libor plus 3.25%		4/15/33		$	5,155		$	5,155
	BNC Bancorp Capital Trust II	3/11/04		6,000		Libor plus 2.80%		4/7/34		6,186			6,186
	BNC Capital Trust III	9/23/04		5,000		Libor plus 2.40%		9/23/34		5,155			5,155
	BNC Capital Trust IV	9/27/06		7,000		Libor plus 1.70%		12/31/36		7,217			7,217
	Total									$	23,713		$	23,713
Schedule of Short Term Debt	The following table presents the Company’s short-term borrowings (dollars in thousands):
		December 31,
		2014				2013
	Repurchase agreements	$	25,834			$	27,202
	Advances from FHLB	102,100				97,300
	Federal funds purchased	—				1,090
	Total short-term borrowings	$	127,934			$	125,592
Summary of Additional Information on Short Term Borrowings	Additional information on the Company’s short-term borrowings is presented in the following table (dollars in thousands):
		Years Ended December 31,
		2014				2013				2012
	Maximum outstanding at any month-end during the year	$	195,941			$	143,674			$	40,149
	Average outstanding balance	96,043				88,635				30,573
	Average interest rate for the year	0.45		%		0.49		%		1.11		%
	Average interest rate at year end	0.28		%		0.39		%		0.51		%
Schedule of Long-term Debt Instruments	The following table presents the Company’s long-term debt (dollars in thousands):
		December 31,
		2014				2013
	FHLB advances	$	52,000			$	51,100
	Subordinated notes	60,000				—
	Unsecured term loan	—				28,875
	Junior subordinated debentures	23,713				23,713
		135,713				103,688
	Less: FHLB prepayment penalty	1,899				2,179
	Total long-term debt	$	133,814			$	101,509
Federal Home Loan Bank, Advances	The following table details the Company's long-term FHLB advances outstanding (dollars in thousands):
					December 31,
	Maturity		Interest Rate		2014				2013
	Jan-15		1.00%		$	—			$	100
	Aug-15		2.37%		—				6,000
	Jul-16		0.88%		2,000				—
	Aug-16		1.72%		2,000				—
	Jan-18		2.15%		15,000				15,000
	Jan-18		2.27%		10,000				10,000
	Jul-18		1.78%		3,000				—
	Jan-20		0.47%		10,000				10,000
	Jan-20		0.47%		10,000				10,000
					$	52,000			$	51,100

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2014
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 (dollars in thousands):
			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
	Balance at December 31, 2012		$	8,872		$	2,881		$	(6,324	)	$	5,429
	Other comprehensive income (loss) before reclassifications		(9,625		)	—			1,662			(7,963		)
	Amounts reclassified from accumulated other comprehensive income		26			(289		)	6,103			5,840
	Amounts transferred as a result of the reclassification of securities from available-for-sale to held-to-maturity		(1,219		)	1,219			—			—
	Net current period other comprehensive income (loss)		(10,818		)	930			7,765			(2,123		)
	Balance at December 31, 2013		(1,946		)	3,811			1,441			3,306
	Other comprehensive income (loss) before reclassifications		8,713			—			(1,923		)	6,790
	Amounts reclassified from accumulated other comprehensive income		322			(522		)	286			86
	Net current period other comprehensive income (loss)		9,035			(522		)	(1,637		)	6,876
	Balance at December 31, 2014		$	7,089		$	3,289		$	(196	)	$	10,182
Reclassification Out Of Accumulated Other Comprehensive Income	The following table details reclassification adjustments from accumulated other comprehensive income (dollars in thousands):
			Year Ended December 31,
	Component of Accumulated Other Comprehensive Income		2014			2013			Affected Line Item in the Consolidated Statement of Income
	Unrealized holding gains on investment securities available-for-sale		$	(511	)	$	(42	)	Gain (loss) on sale of investment securities, net
			189			16			Income tax benefit (expense)
			(322		)	(26		)	Total, net of tax
	Unrealized holding gains on investment securities transferred from available-for-sale to held-to-maturity (1)		829			623			Interest income - investment securities
			(307		)	(334		)	Income tax benefit (expense)
			522			289			Total, net of tax
	Unrealized holding losses on cash flow hedging activities		(457		)	(9,863		)	Interest expense - demand deposits
			171			3,760			Income tax benefit (expense)
			(286		)	(6,103		)	Total, net of tax
	Total reclassifications for the period		$	(86	)	$	(5,840	)
	-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)	12 Months Ended
	Dec. 31, 2014
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 (dollars in thousands):
			Total Measured at Fair Value			Fair Value Measured Using
	Description					Level 1				Level 2			Level 3
	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		$	—
			Total Measured at Fair Value			Fair Value Measured Using
	Description					Level 1				Level 2			Level 3
	31-Dec-13
	Assets:
	Investment securities available-for-sale:
	U.S. Government agencies		$	15,061		$	—			$	15,061		$	—
	State and municipals		191,263			—				191,263			—
	Corporate debt securities		8,889			—				8,889			—
	Other debt securities		4,380			—				4,380			—
	Equity securities		922			922				—			—
	Mortgage-backed securities:
	Residential government sponsored		42,014			—				42,014			—
	Other government sponsored		7,888			—				7,888			—
	Total investment securities available-for-sale		270,417			922				269,495			—
	Derivative instruments:
	Interest rate swap - cash flow hedge		2,744			—				2,744			—
	Interest rate swap - not designated		424			—				424			—
	Interest rate cap/floor - not designated		98			—				98			—
	Total derivative instruments		3,266			—				3,266			—
	Total assets measured at fair value on a recurring basis		$	273,683		$	922			$	272,761		$	—
	Liabilities:
	Interest rate swap - not designated		$	522		$	—			$	522		$	—
	Total liabilities measured at fair value on a recurring basis		$	522		$	—			$	522		$	—
Fair Value Measurements, Nonrecurring	The following tables present information about certain assets and liabilities measured at fair value on a nonrecurring basis (dollars in thousands):
			Total Measured at Fair Value			Fair Value Measured Using
	Description					Level 1				Level 2			Level 3
	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
	31-Dec-13
	Loans held for sale		$	30,899		$	—			$	30,899		$	—
	Impaired loans		228,736			—				—			228,736
	Other real estate owned		47,606			—				—			47,606
	Total assets measured at fair value on a nonrecurring basis		$	307,241		$	—			$	30,899		$	276,342
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 December 31, 2014 (dollars in thousands):
	Description		Fair Value			Valuation Methodology		Unobservable Inputs		Range of Inputs
	Impaired loans		$	190,247		Appraised value		Discount to reflect current market conditions and ultimate collectability		0% - 20%
	Other real estate owned		$	42,531		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 (dollars in thousands):
	31-Dec-14	Carrying Value			Fair Value				Level 1			Level 2			Level 3
	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			—
	31-Dec-13	Carrying Value			Fair Value				Level 1			Level 2			Level 3
	Financial assets:
	Cash and cash equivalents	$	108,390		$	108,390			$	108,390		$	—		$	—
	Investment securities available-for-sale	270,417			270,417				922			269,495			—
	Investment securities held-to-maturity	247,378			236,507				—			236,507			—
	Federal Home Loan Bank stock	10,720			10,720				—			10,720			—
	Loans held for sale	30,899			30,899				—			30,899			—
	Loans receivable, net	2,243,642			2,266,455				—			2,037,719			228,736
	Accrued interest receivable	12,955			12,955				—			12,955			—
	FDIC indemnification asset	16,886			16,886				—			—			16,886
	Investment in bank-owned life insurance	78,439			78,439				—			78,439			—
	Interest rate swap derivative - cash flow hedge	2,744			2,744				—			2,744			—
	Interest rate swap derivative - not designated	424			424				—			424			—
	Interest rate cap/floor derivative - not designated	98			98				—			98			—
	Financial liabilities:
	Demand deposits and savings	$	1,623,931		$	1,623,931			$	—		$	1,623,931		$	—
	Time deposits	1,082,799			1,087,333				—			1,087,333			—
	Short-term borrowings	125,592			125,592				—			125,592			—
	Long-term debt	101,509			97,983				—			97,983			—
	Accrued interest payable	1,434			1,434				—			1,434			—
	Interest rate swap derivative - not designated	522			522				—			522			—

Regulatory_Capital_Tables

Regulatory Capital (Tables)	12 Months Ended
	Dec. 31, 2014
Banking and Thrift [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	The following tables present BNC’s regulatory capital ratios (dollars in thousands):
									For capital adequacy purposes				To be well capitalized under prompt corrective action provisions
			Actual						Minimum				Minimum
	31-Dec-14		Amount				Ratio		Amount		Ratio		Amount		Ratio
	Total capital (to risk weighted assets)		$	390,900			12.21	%	$	256,200	8	%	$	320,250	10	%
	Tier 1 capital (to risk weighted assets)		360,457				11.26	%	128,100		4	%	192,150		6	%
	Tier 1 capital (to average assets)		360,457				9.74	%	147,992		4	%	184,990		5	%
									For capital adequacy purposes				To be well capitalized under prompt corrective action provisions
			Actual						Minimum				Minimum
	31-Dec-13		Amount				Ratio		Amount		Ratio		Amount		Ratio
	Total capital (to risk weighted assets)		$	313,624			12.66	%	$	198,187	8	%	$	247,734	10	%
	Tier 1 capital (to risk weighted assets)		282,634				11.41	%	99,094		4	%	148,640		6	%
	Tier 1 capital (to average assets)		282,634				8.96	%	126,118		4	%	157,647		5	%
	The following table presents the Company’s regulatory capital ratios:
		December 31,
		2014			2013
	Total capital (to risk-weighted assets)	12.49	%		11.57	%
	Tier 1 capital (to risk-weighted assets)	9.71	%		10.33	%
	Tier 1 capital (to average assets)	8.41	%		8.12	%

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The following tables present the Company’s income tax expense (benefit) (dollars in thousands):
		Year Ended December 31,
		2014			2013			2012
	Current income tax provision (benefit):
	Federal	$	9,159		$	(314	)	$	(140	)
	State	1,257			554			350
	Total current income tax provision	10,416			240			210
	Deferred income tax provision (benefit):
	Federal	(1,181		)	2,382			(2,244		)
	State	1,130			1,423			334
	Total deferred income tax provision (benefit)	(51		)	3,805			(1,910		)
	Total income tax provision (benefit)	$	10,365		$	4,045		$	(1,700	)
Schedule of Effective Income Tax Rate Reconciliation	The following tables present the difference between income tax expense (benefit) and the amount computed by applying the statutory income tax rate (dollars in thousands):
		Year Ended December 31,
		2014			2013			2012
	Tax at statutory federal tax rate	$	13,517		$	7,239		$	2,976
	State income tax, net of federal benefit	1,575			1,304			451
	Tax exempt interest income	(4,485		)	(4,008		)	(3,241		)
	Income from life insurance	(810		)	(789		)	(601		)
	Gain on acquisition	—			—			(1,690		)
	Other	568			299			405
	Total income tax provision (benefit)	$	10,365		$	4,045		$	(1,700	)
Schedule of Deferred Tax Assets and Liabilities	Significant components of deferred tax assets and liabilities were as follows (dollars in thousands):
		December 31,
		2014			2013
	Deferred income tax assets:
	Allowance for loan losses	$	14,996		$	10,660
	Net operating loss carryforwards	9,595			10,593
	Deferred compensation	2,229			2,203
	Unrealized loss on interest rate cap	114			—
	Other real estate owned writedowns	3,519			3,536
	AMT credit carryforward	12,033			3,488
	Interest on nonaccrual loans	270			110
	Stock-based compensation	971			546
	Fair value adjustments from acquisitions	16,332			6,273
	Other	1,699			1,089
	Total deferred income tax assets	61,758			38,498
	Deferred income tax liabilities:
	Premises and equipment	4,030			2,978
	Leasing activities	728			702
	Unrealized gains on investment securities and derivatives	4,163			2,110
	Deferred loan costs and fees	1,950			979
	Core deposit intangibles	5,037			2,306
	FDIC acquisitions	337			4,424
	Other	1,629			1,554
	Total deferred income tax liabilities	17,874			15,053
	Less valuation allowance	2,906			360
	Net deferred income tax asset	$	40,978		$	23,085

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
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 (dollars in thousands):
		December 31,
		2014		2013
	Commitments under unfunded loans and lines of credit	$	663,137	$	377,021
	Letters of credit	6,607		7,926
	Unused credit card lines	4,512		4,120

Employee_Benefits_Tables

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2014
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 year ended December 31, 2014 is presented below (dollars in thousands, except per share data):
		Shares		Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
	Outstanding at December 31, 2013	412,337		$	11.34
	Exercised	74,559		11.23
	Forfeited or expired	—		—
	Outstanding at December 31, 2014	337,778		$	11.37	2.24	$	1,734
	Exercisable at December 31, 2014	336,354		$	11.37	2.23	$	1,725
	Share options expected to vest	1,424		$	9.67	5.27	$	10
Schedule of Nonvested Restricted Stock Units Activity	A summary of the activity of the Company’s unvested restricted stock awards for the year ended December 31, 2014 is presented below:
		Number of Shares		Weighted Average Grant-Date Fair Value
	Unvested at December 31, 2013	303,396		$	9.58
	Granted	461,653		16.9
	Vested	(160,780	)	10.62
	Forfeited	(3,001	)	14.6
	Unvested at December 31, 2014	601,268		$	14.9

Parent_Company_Financial_Data_

Parent Company Financial Data (Tables)	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Balance Sheets Of Parent Company Only	The following are condensed financial statements of the Parent Company as of and for the years ended December 31, 2014, 2013 and 2012 (dollars in thousands):
	CONDENSED BALANCE SHEETS
	December 31, 2014 and 2013
		31-Dec-14			31-Dec-13
	Assets
	Cash and due from banks	$	9,717		$	1,392
	Investment in bank subsidiary	462,659			320,941
	Investment in other subsidiaries	1,113			1,113
	Other assets	1,493			622
	Total assets	$	474,982		$	324,068
	Liabilities and shareholders' equity
	Other liabilities	$	881		$	150
	Long-term debt	83,713			52,588
	Total liabilities	84,594			52,738
	Shareholders' equity:
	Common stock, no par value	281,488			168,616
	Common stock, non-voting, no par value	33,507			57,849
	Retained earnings	65,211			41,559
	Stock in directors rabbi trust	(3,429		)	(3,143		)
	Directors deferred fees obligation	3,429			3,143
	Accumulated other comprehensive income	10,182			3,306
	Total shareholders' equity	390,388			271,330
	Total liabilities and shareholders' equity	$	474,982		$	324,068
Condensed Income Statements of Parent Company Only	CONDENSED STATEMENTS OF INCOME
	Years Ended December 31, 2014, 2013 and 2012
		2014			2013			2012
	Dividends from bank subsidiary	$	29,612		$	13,760		$	3,675
	Equity in undistributed earnings of bank subsidiary	3,336			5,434			8,094
	Other income	647			625			626
	Interest expense	2,796			1,920			939
	Other expense	1,409			652			1,003
	Net income	$	29,390		$	17,247		$	10,453
Condensed Statements Of Cash Flows Of Parent Company Only	CONDENSED STATEMENTS OF CASH FLOWS
	Years Ended December 31, 2014, 2013 and 2012
		2014			2013			2012
	Operating activities
	Net income	$	29,390		$	17,247		$	10,453
	Adjustments to reconcile net income to net cash provided by operating activities:
	Equity in undistributed earnings of bank subsidiary	(3,336		)	(5,434		)	(8,094		)
	Amortization	452			48			11
	(Increase) decrease in other assets	(1,323		)	(472		)	2
	Increase (decrease) in other liabilities	828			(10,687		)	10,267
	Net cash provided by operating activities	26,011			702			12,639
	Investing activities
	Net cash used in investment in subsidiaries	(37,903		)	—			(61,397		)
	Financing activities
	Net increase (decrease) in short-term borrowings	—			—			(6,280		)
	Net increase in long-term debt	31,125			26,440			2,460
	Preferred stock issued (redeemed), net	—			(31,260		)	68,308
	Redemption of common stock warrant	—			—			(940		)
	Common stock issued from exercise of stock options	173			—			138
	Income tax benefit from exercise of stock options, net	—			—			17
	Common stock issued pursuant to dividend reinvestment plan	336			260			225
	Common stock repurchased	(5,081		)	—			—
	Common stock repurchased in lieu of income taxes	(598		)	—			—
	Cash dividends paid, net of accretion	(5,738		)	(5,853		)	(4,879		)
	Net cash provided by (used in) financing activities	20,217			(10,413		)	59,049
	Net increase (decrease) in cash and cash equivalents	8,325			(9,711		)	10,291
	Cash and cash equivalents, beginning of period	1,392			11,103			812
	Cash and cash equivalents, end of period	$	9,717		$	1,392		$	11,103

Summary_of_Significant_Account2

Summary of Significant Accounting Policies Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	Segments
Property, Plant and Equipment [Line Items]
Number of Operating Segments	2
Cash and Securities Segregated under Federal and Other Regulations	$12,100,000	$8,400,000
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Minimum
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Minimum | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Maximum | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Annually
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Receivables Specifically Reviewed, Threshold	1,000,000
Special Mention | Quarterly | Loans with Committed Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Receivables Specifically Reviewed, Threshold	250,000
Special Mention | Quarterly | Loans with Total Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Receivables Specifically Reviewed, Threshold	500,000
Nonaccrual | Quarterly | Commercial Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Receivables Requiring Specific Reserves, Threshold	250,000
Troubled Debt Restructuring | Quarterly | Retail Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Receivables Requiring Specific Reserves, Threshold	$250,000

Acquisitions_Schedule_of_Recog

Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed Harbor Bank Group (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Dec. 02, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Goodwill		$69,749	$28,384	$27,111
Harbor Bank Group, Inc | 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
Harbor Bank Group, Inc | 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
Harbor Bank Group, Inc | 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) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Jun. 02, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Goodwill		$69,749	$28,384	$27,111
Community First Financial Group, Inc
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 | Community First Financial Group, Inc
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 | Community First Financial Group, Inc
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 | Community First Financial Group, Inc
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) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Apr. 02, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Goodwill		$69,749	$28,384	$27,111
South Street Financial Corporation
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 | South Street Financial Corporation
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 | South Street Financial Corporation
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 | South Street Financial Corporation
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_Schedule_of_Recog3

Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed Randolph Bank and Trust (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Oct. 02, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Goodwill		$69,749	$28,384	$27,111
Randolph Bank and Trust
Business Acquisition [Line Items]
Total assets acquired	284,000
Total consideration paid	14,037
Common stock issued	9,642
Redemption of preferred stock	2,300
Cash payments to common stockholders	2,095
As Recorded By Acquiree | Randolph Bank and Trust
Business Acquisition [Line Items]
Cash and due from banks	14,207
Investment securities available-for-sale	5,082
Federal Home Loan Bank stock, at cost	630
Loans	161,220
Premises and equipment	4,537
Accrued interest receivable	800
Other real estate owned	4,844
Core deposit intangible	0
Other assets	92,289
Total assets acquired	283,609
Deposits	-260,484
Borrowings	-6,100
Other liabilities	-1,291
Total liabilities assumed	-267,875
Measurement Period Adjustments | Randolph Bank and Trust
Business Acquisition [Line Items]
Cash and due from banks	0
Investment securities available-for-sale	130
Federal Home Loan Bank stock, at cost	0
Loans	-6,973
Premises and equipment	811
Accrued interest receivable	0
Other real estate owned	-626
Core deposit intangible	2,676
Other assets	1,744
Total assets acquired	-2,238
Deposits	-523
Borrowings	-209
Other liabilities	0
Total liabilities assumed	-732
As Recorded By Acquirer | Randolph Bank and Trust
Business Acquisition [Line Items]
Cash and due from banks	14,207
Investment securities available-for-sale	5,212
Federal Home Loan Bank stock, at cost	630
Loans	154,247
Premises and equipment	5,348
Accrued interest receivable	800
Other real estate owned	4,218
Core deposit intangible	2,676
Other assets	94,033
Total assets acquired	281,371
Deposits	-261,007
Borrowings	-6,309
Other liabilities	-1,291
Total liabilities assumed	-268,607
Net assets acquired	12,764
Total consideration paid	14,037
Goodwill	$1,273

Acquisitions_Pro_Forma_Informa

Acquisitions - Pro Forma Information (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Business Combinations [Abstract]
Pro Forma Information, Net Interest Income (Expense) since Acquisition Date, Actual	$13,488
Pro Forma Information, Net Non-Interest Income (Expense) since Acquisition Date, Actual	571
Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	5,661
Pro Forma Information, Earnings or Loss of Acquiree Available to Shareholders since Acquisition Date, Actual	5,661
Pro Forma Net Interest Income (Expense)	156,650	141,778
Pro Forma Net Non-Interest Income (Expense)	29,795	28,363
Pro Forma Net Income (Loss)	31,585	21,811
Pro Forma Net Income (Loss) Available to Shareholders	$31,585	$10,751
Pro Forma Earnings Per Share, Basic	$0.97	$0.65
Pro Forma Earnings Per Share, Diluted	$0.96	$0.65

Acquisitions_Narrative_Details

Acquisitions - Narrative (Details) (USD $)	0 Months Ended				12 Months Ended	0 Months Ended	12 Months Ended
	Nov. 17, 2014	Dec. 02, 2014	Jun. 02, 2014	Apr. 02, 2014	Dec. 31, 2014	Oct. 02, 2013	Dec. 31, 2013
						branch
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%
Acquisition Related Costs					8,200,000
Randolph Bank and Trust
Business Acquisition [Line Items]
Ratio of Shares Issued Per Share of Acquired Entity						0.87
Per Share of Acquired Entity						$10
Shareholders of Acquired Entity Electing Stock Conversion Option						80.00%
Shareholders of Acquired Entity Electing Cash Payment Option						20.00%
Total assets acquired						$284,000,000
Number of Locations Acquired						6
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		1,190,763
Common stock | South Street Financial Corporation
Business Acquisition [Line Items]
Stock Issued For Acquisitions				1,139,931	1,139,931
Common stock | Randolph Bank and Trust
Business Acquisition [Line Items]
Stock Issued For Acquisitions							726,634

Earnings_Per_Share_Schedule_of

Earnings Per Share - Schedule of Earnings Per Share Basic and Diluted (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income available to common shareholders	$29,390	$16,187	$8,049
Convertible Preferred Dividends, Net of Tax	0	0	361
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic	$29,390	$16,187	$8,410
Weighted Average Common Shares - Basic	29,049,525	26,495,211	15,790,448
Add: Effect of Convertible Preferred Stock	0	187,873	1,804,566
Weighted Average Participating Common Shares - Basic	29,049,525	26,683,084	17,595,014
Effects of Dilutive Stock Rights	102,352	31,090	4,204
Weighted Average Participating Common Shares - Diluted	29,151,877	26,714,174	17,599,218
Basic (USD per share)	$1.01	$0.61	$0.48
Diluted (USD per share)	$1.01	$0.61	$0.48
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	106,283	428,536

Investment_Securities_Marketab

Investment Securities - Marketable Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$258,038	$273,507
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	12,255	4,442
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	1,003	7,532
Investment securities available-for-sale, at fair value	269,290	270,417
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	237,092	247,378
Held To Maturity Securities, Accumulated Unrecognized Holding Gain	6,314	379
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	1,409	11,250
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	241,997	236,507
State And Municipal Securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	213,092	221,378
Held To Maturity Securities, Accumulated Unrecognized Holding Gain	6,266	379
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	389	10,169
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	218,969	211,588
Corporate Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	14,000	16,000
Held To Maturity Securities, Accumulated Unrecognized Holding Gain	48	0
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	1,020	1,081
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	13,028	14,919
Other Held-to-Maturity Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	10,000	10,000
Held To Maturity Securities, Accumulated Unrecognized Holding Gain	0	0
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	10,000	10,000
US Government Agencies
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	17,636	15,720
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	252	4
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	0	663
Investment securities available-for-sale, at fair value	17,888	15,061
State and Municipal Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	178,263	194,224
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	10,899	2,704
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	227	5,665
Investment securities available-for-sale, at fair value	188,935	191,263
Residential Government Sponsored Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	27,450	41,231
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	884	1,442
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	60	659
Investment securities available-for-sale, at fair value	28,274	42,014
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	1,972	7,615
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	131	276
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	0	3
Investment securities available-for-sale, at fair value	2,103	7,888
Corporate Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	13,808	9,011
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	4	16
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	197	138
Investment securities available-for-sale, at fair value	13,615	8,889
Schedule of Held-to-maturity Securities [Line Items]
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	1,020	1,081
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	6,145	979
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	85	0
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	321	57
Investment securities available-for-sale, at fair value	5,909	922
Other Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	12,764	4,727
Available For Sale Debt Securities, Gross Unrealized Gain, Accumulated In Investments	0	0
Available For Sale Debt Securities, Gross Unrealized Loss, Accumulated In Investments	198	347
Investment securities available-for-sale, at fair value	$12,566	$4,380

Investment_Securities_Investme

Investment Securities - Investments Classified by Contractual Maturity Date (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
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	$10,853
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	6,692
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	18,976
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	215,372
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Total	251,893
Available-for-sale Equity Securities, Amortized Cost Basis	6,145
Available-for-sale Securities, Amortized Cost Basis	258,038	273,507
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	17,155
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	22,784
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	197,153
Held-to-maturity Securities, Debt Maturities, Amortized Cost, Total	237,092	247,378
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	10,851
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	6,733
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	19,171
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	226,626
Available-for-sale Securities, Debt Securities, Fair Value	263,381
Available-for-sale Securities, Equity Securities, Fair Value	5,909
Available-for-sale Securities, Fair Value	269,290	270,417
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	16,600
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	22,858
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	202,539
Held-to-maturity Securities, Debt Maturities, Fair Value, Total	$241,997	$236,507

Investment_Securities_Schedule

Investment Securities - Schedule of Realized Gain (Loss) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Proceeds from Sale of Available-for-sale Securities, Debt	$49,297	$18,414	$117,381
Available-for-sale Securities, Gross Realized Gains	481	201	3,117
Gross Realized Losses on Sales	-992	-243	-91
Total Realized Gains (Losses), Net	($511)	($42)	$3,026

Summary_of_Investment_Securiti

- Summary of Investment Securities, Continuous Unrealized Loss Position (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
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	$16,687	$114,714
Available For Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses Accumulated In Investments	201	5,296
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	36,776	32,558
Available For Sale Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Aggregate Losses Accumulated In Investments	802	2,236
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	53,463	147,272
Available For Sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated In Investments	1,003	7,532
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,148	167,504
Held to maturity Securities, Continuous Unrealized Loss Position Less Than 12 Months, Accumulated Loss	25	8,386
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	45,277	31,218
Held to maturity Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Accumulated Loss	1,384	2,864
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	47,425	198,722
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	1,409	11,250
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	5	71
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	18	25
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	2	151
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	37	26
US Government Agencies
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		14,583
Available For Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses Accumulated In Investments		663
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		0
Available For Sale Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Aggregate Losses Accumulated In Investments		0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		14,583
Available For Sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated In Investments		663
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year		5
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year		0
State And Municipal Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	72,821
Available For Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses Accumulated In Investments	0	3,647
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	24,083	27,976
Available For Sale Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Aggregate Losses Accumulated In Investments	227	2,018
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	24,083	100,797
Available For Sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated In Investments	227	5,665
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,148	162,565
Held to maturity Securities, Continuous Unrealized Loss Position Less Than 12 Months, Accumulated Loss	25	8,325
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	42,297	28,238
Held to maturity Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Accumulated Loss	364	1,844
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	44,445	190,803
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	389	10,169
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	0	47
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	11	21
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	2	150
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	36	25
Corporate Debt Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	10,134	7,862
Available For Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses Accumulated In Investments	172	138
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,975	0
Available For Sale Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Aggregate Losses Accumulated In Investments	25	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	13,109	7,862
Available For Sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated In Investments	197	138
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	4,939
Held to maturity Securities, Continuous Unrealized Loss Position Less Than 12 Months, Accumulated Loss	0	61
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,980	2,980
Held to maturity Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Accumulated Loss	1,020	1,020
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	2,980	7,919
Held To Maturity Securities, Accumulated Unrecognized Holding Loss	1,020	1,081
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	3	2
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	1	0
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	0	1
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	0	4,380
Available For Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses Accumulated In Investments	0	347
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	4,566	0
Available For Sale Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Aggregate Losses Accumulated In Investments	198	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	4,566	4,380
Available For Sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated In Investments	198	347
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	1	0
Equity Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,850	922
Available For Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses Accumulated In Investments	18	57
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	676	0
Available For Sale Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Aggregate Losses Accumulated In Investments	303	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,526	922
Available For Sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated In Investments	321	57
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	0
Collateralized Mortgage Backed Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,703	14,146
Available For Sale Securities, Continuous Unrealized Loss Position, Less Than 12 Months, Aggregate Losses Accumulated In Investments	11	444
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	4,476	4,582
Available For Sale Securities, Continuous Unrealized Loss Position 12 Months Or Longer, Aggregate Losses Accumulated In Investments	49	218
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	9,179	18,728
Available For Sale Securities, Continuous Unrealized Loss Position, Aggregate Losses Accumulated In Investments	$60	$662
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	1	15
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	4	4

Investment_Securities_Narrativ

Investment Securities - Narrative (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Investment Securities [Line Items]
Security Owned and Pledged as Collateral, Fair Value	$269.20	$184
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year, Loss Greater than 3 Percent Book	0
State And Municipal Securities
Schedule of Investment Securities [Line Items]
Held-to-maturity Securities, Sold at Carrying Value	3.3
Held-to-maturity Securities, Realized Gain (Loss)	0.2
Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	47
Corporate Debt Securities
Schedule of Investment Securities [Line Items]
Held-to-maturity Securities, Sold at Carrying Value	5.2
Held-to-maturity Securities, Realized Gain (Loss)	$0.10

Loans_and_Allowance_for_Loan_L2

Loans and Allowance for Loan Losses - Schedule of Financing Receivables Originated and Acquired (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Originated loans	$2,116,441,000	$1,704,876,000
Acquired loans	958,657,000	571,641,000
Loans and Leases Receivable, Net	3,075,098,000	2,276,517,000
Financing Receivable Covered by Loss Sharing Agreement	137,500,000	187,700,000
Unpaid Principal Balance Of Covered Acquired Loans	140,400,000	195,400,000
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Originated loans	1,181,492,000	1,014,633,000
Acquired loans	403,672,000	318,023,000
Loans and Leases Receivable, Net	1,585,164,000	1,332,656,000
Commercial construction
Financing Receivable, Recorded Investment [Line Items]
Originated loans	265,968,000	202,140,000
Acquired loans	48,668,000	42,420,000
Loans and Leases Receivable, Net	314,636,000	244,560,000
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Originated loans	154,132,000	139,567,000
Acquired loans	38,200,000	29,372,000
Loans and Leases Receivable, Net	192,332,000	168,939,000
Leases
Financing Receivable, Recorded Investment [Line Items]
Originated loans	21,100,000	16,137,000
Acquired loans	0	0
Loans and Leases Receivable, Net	21,100,000	16,137,000
Total commercial
Financing Receivable, Recorded Investment [Line Items]
Originated loans	1,622,692,000	1,372,477,000
Acquired loans	490,540,000	389,815,000
Loans and Leases Receivable, Net	2,113,232,000	1,762,292,000
Residential construction
Financing Receivable, Recorded Investment [Line Items]
Originated loans	43,298,000	29,636,000
Acquired loans	29,854,000	2,798,000
Loans and Leases Receivable, Net	73,152,000	32,434,000
Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Originated loans	439,600,000	294,660,000
Acquired loans	432,818,000	173,263,000
Loans and Leases Receivable, Net	872,418,000	467,923,000
Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Originated loans	10,851,000	8,103,000
Acquired loans	5,445,000	5,765,000
Loans and Leases Receivable, Net	$16,296,000	$13,868,000

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 $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accretable Yield
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	($6,058)	($12,895)
Reductions from payments and foreclosures, net	0	0
Reclass from non-accretable to accretable yield	-221	-968
Accretion	-4,066	-7,805
Balance at end of period	-2,213	-6,058
Carrying Amount
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	187,661	248,930
Reductions from payments and foreclosures, net	-54,489	-70,042
Reclass from non-accretable to accretable yield	221	968
Accretion	-4,066	-7,805
Balance at end of period	$137,459	$187,661

Loans_and_Allowance_for_Loan_L4

Loans and Allowance for Loan Losses - Schedule of Loans Acquired Under ASC310-30 (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Receivables [Abstract]
Contractually required payments receivable	$45,349
Contractual cash flows not expected to be collected (non-accretable)	-8,674
Expected cash flows	36,675
Interest component of expected cash flows	-3,930
Fair value of loans acquired	$32,745

Loans_and_Allowance_for_Loan_L5

Loans and Allowance for Loan Losses - Schedule of Related Party Transactions (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance at beginning of year	$6,463
Additional borrowings	20,766
Loan repayments	-21,933
Balance at end of year	$5,296

Loans_and_Allowance_for_Loan_L6

Loans and Allowance for Loan Losses Schedule of Allowance for Loan and Lease Losses (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	$32,875	$40,292	$31,008
Provision for loan losses	7,006	12,188	22,737
Change in FDIC Indemnification Asset	1,600	1,084	17,711
Charge-offs	14,636	28,428	34,710
Recoveries	6,729	7,739	3,546
Loans and leases, Allowance, Ending Balance	30,399	32,875	40,292
Financing Receivable [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	32,875	40,292
Provision for loan losses	7,006	12,188
Change in FDIC Indemnification Asset	-1,575	1,084
Charge-offs	14,636	28,428
Recoveries	6,729	7,739
Loans and leases, Allowance, Ending Balance	$30,399	$32,875

Loans_and_Allowance_for_Loan_L7

Loans and Allowance for Loan Losses - Analysis of Allowance for Loan Losses by Class of Financing Receivables (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	$32,875,000	$40,292,000	$31,008,000
Charge-offs	-14,636,000	-28,428,000	-34,710,000
Recoveries	6,729,000	7,739,000	3,546,000
Provision for loan losses	7,006,000	12,188,000	22,737,000
Change in FDIC Indemnification Asset	1,600,000	1,084,000	17,711,000
Loans and leases, Allowance, Ending Balance	30,399,000	32,875,000	40,292,000
Loans and Leases Receivable, Net	3,075,098,000	2,276,517,000
Net Provision For Loan Losses On Covered Loans	-600,000	600,000
Provision for Loan and Lease Losses Covered by the FDIC	2,200,000	1,700,000
Commercial real estate
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	14,752,000	15,718,000
Charge-offs	-3,339,000	-5,492,000
Recoveries	1,289,000	1,525,000
Provision for loan losses	412,000	5,084,000
Change in FDIC Indemnification Asset	-429,000	-2,083,000
Loans and leases, Allowance, Ending Balance	12,685,000	14,752,000
Impaired loans	1,614,000	3,209,000
Purchase credit impaired loans	1,727,000	2,979,000
Total specific reserves	3,341,000	6,188,000
General reserves	9,344,000	8,564,000
Individually evaluated for impairment	27,578,000	33,950,000
Purchase credit impaired loans	82,477,000	100,290,000
Loans collectively evaluated for impairment	1,475,109,000	1,198,416,000
Loans and Leases Receivable, Net	1,585,164,000	1,332,656,000
Commercial construction
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	6,738,000	9,807,000
Charge-offs	-3,483,000	-9,519,000
Recoveries	1,830,000	2,712,000
Provision for loan losses	-155,000	1,879,000
Change in FDIC Indemnification Asset	-619,000	1,859,000
Loans and leases, Allowance, Ending Balance	4,311,000	6,738,000
Impaired loans	118,000	1,595,000
Purchase credit impaired loans	424,000	691,000
Total specific reserves	542,000	2,286,000
General reserves	3,769,000	4,452,000
Individually evaluated for impairment	4,080,000	12,877,000
Purchase credit impaired loans	11,326,000	18,460,000
Loans collectively evaluated for impairment	299,230,000	213,223,000
Loans and Leases Receivable, Net	314,636,000	244,560,000
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	3,137,000	3,578,000
Charge-offs	-3,279,000	-3,442,000
Recoveries	1,205,000	1,721,000
Provision for loan losses	2,281,000	1,017,000
Change in FDIC Indemnification Asset	-118,000	263,000
Loans and leases, Allowance, Ending Balance	3,226,000	3,137,000
Impaired loans	42,000	43,000
Purchase credit impaired loans	152,000	552,000
Total specific reserves	194,000	595,000
General reserves	3,032,000	2,542,000
Individually evaluated for impairment	1,264,000	1,525,000
Purchase credit impaired loans	4,591,000	6,649,000
Loans collectively evaluated for impairment	186,477,000	160,765,000
Loans and Leases Receivable, Net	192,332,000	168,939,000
Leases
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	56,000	18,000
Charge-offs	0	0
Recoveries	0	0
Provision for loan losses	47,000	38,000
Change in FDIC Indemnification Asset	0	0
Loans and leases, Allowance, Ending Balance	103,000	56,000
Impaired loans	0	0
Purchase credit impaired loans	0	0
Total specific reserves	0	0
General reserves	103,000	56,000
Individually evaluated for impairment	0	0
Purchase credit impaired loans	0	0
Loans collectively evaluated for impairment	21,100,000	16,137,000
Loans and Leases Receivable, Net	21,100,000	16,137,000
Residential construction
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	213,000	593,000
Charge-offs	0	0
Recoveries	70,000	58,000
Provision for loan losses	293,000	-412,000
Change in FDIC Indemnification Asset	-6,000	-26,000
Loans and leases, Allowance, Ending Balance	570,000	213,000
Impaired loans	230,000	35,000
Purchase credit impaired loans	0	0
Total specific reserves	230,000	35,000
General reserves	340,000	178,000
Individually evaluated for impairment	657,000	356,000
Purchase credit impaired loans	952,000	16,000
Loans collectively evaluated for impairment	71,543,000	32,062,000
Loans and Leases Receivable, Net	73,152,000	32,434,000
Residential mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	7,730,000	10,441,000
Charge-offs	-4,344,000	-9,598,000
Recoveries	2,196,000	1,696,000
Provision for loan losses	4,161,000	4,224,000
Change in FDIC Indemnification Asset	-430,000	967,000
Loans and leases, Allowance, Ending Balance	9,313,000	7,730,000
Impaired loans	972,000	1,361,000
Purchase credit impaired loans	1,556,000	1,833,000
Total specific reserves	2,528,000	3,194,000
General reserves	6,785,000	4,536,000
Individually evaluated for impairment	13,019,000	14,037,000
Purchase credit impaired loans	50,164,000	50,825,000
Loans collectively evaluated for impairment	809,235,000	403,061,000
Loans and Leases Receivable, Net	872,418,000	467,923,000
Consumer and other
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	249,000	137,000
Charge-offs	-191,000	-377,000
Recoveries	139,000	27,000
Provision for loan losses	-33,000	358,000
Change in FDIC Indemnification Asset	27,000	104,000
Loans and leases, Allowance, Ending Balance	191,000	249,000
Impaired loans	13,000	10,000
Purchase credit impaired loans	11,000	23,000
Total specific reserves	24,000	33,000
General reserves	167,000	216,000
Individually evaluated for impairment	126,000	165,000
Purchase credit impaired loans	872,000	1,917,000
Loans collectively evaluated for impairment	15,298,000	11,786,000
Loans and Leases Receivable, Net	16,296,000	13,868,000
Financing Receivable
Allowance for Loan and Lease Losses [Roll Forward]
Loans and leases, Allowance, Beginning Balance	32,875,000	40,292,000
Charge-offs	-14,636,000	-28,428,000
Recoveries	6,729,000	7,739,000
Provision for loan losses	7,006,000	12,188,000
Change in FDIC Indemnification Asset	-1,575,000	1,084,000
Loans and leases, Allowance, Ending Balance	30,399,000	32,875,000
Impaired loans	2,989,000	6,253,000
Purchase credit impaired loans	3,870,000	6,078,000
Total specific reserves	6,859,000	12,331,000
General reserves	23,540,000	20,544,000
Individually evaluated for impairment	46,724,000	62,910,000
Purchase credit impaired loans	150,382,000	178,157,000
Loans collectively evaluated for impairment	2,877,992,000	2,035,450,000
Loans and Leases Receivable, Net	$3,075,098,000	$2,276,517,000

Loans_and_Allowance_for_Loan_L8

Loans and Allowance for Loan Losses - Schedule of Impaired Loans (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	$22,045	$34,877
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	22,027	34,801
Impaired Financing Receivable, Allowances for Loan Losses Allocated	2,989	6,253
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	33,293	35,011
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	33,782	36,025
Originated | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	10,110	16,261
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	10,089	16,228
Impaired Financing Receivable, Allowances for Loan Losses Allocated	1,571	3,164
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	17,095	17,129
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	17,071	17,116
Originated | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,734	7,239
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,728	7,218
Impaired Financing Receivable, Allowances for Loan Losses Allocated	105	1,582
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,227	5,536
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,218	5,902
Originated | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	798	934
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	790	932
Impaired Financing Receivable, Allowances for Loan Losses Allocated	26	42
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	268	3
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	271	0
Originated | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	350	357
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	349	355
Impaired Financing Receivable, Allowances for Loan Losses Allocated	44	35
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	6,278	8,529
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,260	8,513
Impaired Financing Receivable, Allowances for Loan Losses Allocated	694	1,333
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,057	3,719
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	5,045	3,699
Originated | Consumer Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	127	104
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	126	104
Impaired Financing Receivable, Allowances for Loan Losses Allocated	13	10
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	37
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	37
Originated | Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	19,397	33,424
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	19,342	33,350
Impaired Financing Receivable, Allowances for Loan Losses Allocated	2,453	6,166
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	24,647	26,424
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	24,605	26,754
Acquired (non-covered) | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	429	490
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	428	489
Impaired Financing Receivable, Allowances for Loan Losses Allocated	43	45
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	557
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	565
Acquired (non-covered) | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	133	142
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	132	141
Impaired Financing Receivable, Allowances for Loan Losses Allocated	13	14
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	42	0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	41	0
Acquired (non-covered) | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	204	185
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	203	185
Impaired Financing Receivable, Allowances for Loan Losses Allocated	16	1
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1	406
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0	648
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	1,574	636
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,614	636
Impaired Financing Receivable, Allowances for Loan Losses Allocated	279	27
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,869	1,236
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	3,338	1,528
Acquired (non-covered) | Consumer Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		0
Impaired Financing Receivable, Allowances for Loan Losses Allocated		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		24
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		21
Acquired (non-covered) | Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,648	1,453
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,685	1,451
Impaired Financing Receivable, Allowances for Loan Losses Allocated	536	87
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,026	2,223
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	3,493	2,762
Acquired (covered) | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	0
Impaired Financing Receivable, Allowances for Loan Losses Allocated	0	0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	796	173
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	824	183
Acquired (covered) | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	0
Impaired Financing Receivable, Allowances for Loan Losses Allocated	0	0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	427	400
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	426	414
Acquired (covered) | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	0
Impaired Financing Receivable, Allowances for Loan Losses Allocated	0	0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0	3
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	28	35
Acquired (covered) | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	0
Impaired Financing Receivable, Allowances for Loan Losses Allocated	0	0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,397	5,788
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	4,406	5,877
Acquired (covered) | Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	0
Impaired Financing Receivable, Allowances for Loan Losses Allocated	0	0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,620	6,364
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	$5,684	$6,509

Loans_and_Allowance_for_Loan_L9

Loans and Allowance for Loan Losses - Schedule of Average Recorded Investments and Interest Income Recognized on Impaired Loans (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	$16,618	$20,205
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	584	839
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	15,658	12,724
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	445	600
Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,498	6,700
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	104	246
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	6,266	8,192
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	275	346
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,190	499
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	23	28
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	156	592
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	30
Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	113	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	6	0
Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	407	367
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	26	12
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	7,119	11,074
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	102	381
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	12,376	10,614
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	481	357
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	134	23
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	6	0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	29	40
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	0	0
Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	27,966	38,868
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	845	1,506
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	34,598	32,162
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	$1,207	$1,333

Recovered_Sheet1

Loans and Allowance for Loan Losses - Aging of Financing Receivables (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net	$3,075,098	$2,276,517
Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	7,325	5,208
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	2,391	1,761
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	24,723	40,859
Financing Receivable, Recorded Investment, Total Past Due	34,439	47,828
Financing Receivable, Recorded Investment, Current	3,040,659	2,228,689
Loans and Leases Receivable, Net	3,075,098	2,276,517
Originated | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	1,974	353
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	3,476	6,044
Financing Receivable, Recorded Investment, Total Past Due	5,450	6,397
Financing Receivable, Recorded Investment, Current	1,176,042	1,008,236
Loans and Leases Receivable, Net	1,181,492	1,014,633
Originated | Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	12	14
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	20
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	1,084	2,801
Financing Receivable, Recorded Investment, Total Past Due	1,096	2,835
Financing Receivable, Recorded Investment, Current	264,872	199,305
Loans and Leases Receivable, Net	265,968	202,140
Originated | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	102	533
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	24	10
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	417	245
Financing Receivable, Recorded Investment, Total Past Due	543	788
Financing Receivable, Recorded Investment, Current	153,589	138,779
Loans and Leases Receivable, Net	154,132	139,567
Originated | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0
Financing Receivable, Recorded Investment, Total Past Due	0	0
Financing Receivable, Recorded Investment, Current	21,100	16,137
Loans and Leases Receivable, Net	21,100	16,137
Originated | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	200	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0
Financing Receivable, Recorded Investment, Total Past Due	200	0
Financing Receivable, Recorded Investment, Current	43,098	29,636
Loans and Leases Receivable, Net	43,298	29,636
Originated | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	1,508	1,417
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,268	248
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	3,498	5,102
Financing Receivable, Recorded Investment, Total Past Due	6,274	6,767
Financing Receivable, Recorded Investment, Current	433,326	287,893
Loans and Leases Receivable, Net	439,600	294,660
Originated | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	6	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	0	37
Financing Receivable, Recorded Investment, Total Past Due	6	37
Financing Receivable, Recorded Investment, Current	10,845	8,066
Loans and Leases Receivable, Net	10,851	8,103
Originated | Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	3,802	2,317
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,292	278
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	8,475	14,229
Financing Receivable, Recorded Investment, Total Past Due	13,569	16,824
Financing Receivable, Recorded Investment, Current	2,102,872	1,688,052
Loans and Leases Receivable, Net	2,116,441	1,704,876
Acquired (non-covered) | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	291	116
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	155	0
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	433	605
Financing Receivable, Recorded Investment, Total Past Due	879	721
Financing Receivable, Recorded Investment, Current	330,135	220,850
Loans and Leases Receivable, Net	331,014	221,571
Acquired (non-covered) | Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	191	50
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	33	0
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	42	0
Financing Receivable, Recorded Investment, Total Past Due	266	50
Financing Receivable, Recorded Investment, Current	37,980	24,039
Loans and Leases Receivable, Net	38,246	24,089
Acquired (non-covered) | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	73	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	5
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	52	591
Financing Receivable, Recorded Investment, Total Past Due	125	596
Financing Receivable, Recorded Investment, Current	34,266	22,857
Loans and Leases Receivable, Net	34,391	23,453
Acquired (non-covered) | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	422	0
Financing Receivable, Recorded Investment, Total Past Due	422	0
Financing Receivable, Recorded Investment, Current	29,432	2,782
Loans and Leases Receivable, Net	29,854	2,782
Acquired (non-covered) | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	1,946	950
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	848	514
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	4,239	1,665
Financing Receivable, Recorded Investment, Total Past Due	7,033	3,129
Financing Receivable, Recorded Investment, Current	376,087	105,110
Loans and Leases Receivable, Net	383,120	108,239
Acquired (non-covered) | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	66	108
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	2	1
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	0	24
Financing Receivable, Recorded Investment, Total Past Due	68	133
Financing Receivable, Recorded Investment, Current	4,505	3,713
Loans and Leases Receivable, Net	4,573	3,846
Acquired (non-covered) | Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	2,567	1,224
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,038	520
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	5,188	2,885
Financing Receivable, Recorded Investment, Total Past Due	8,793	4,629
Financing Receivable, Recorded Investment, Current	812,405	379,351
Loans and Leases Receivable, Net	821,198	383,980
Acquired (covered) | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	589	1,145
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	848
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	4,075	8,086
Financing Receivable, Recorded Investment, Total Past Due	4,664	10,079
Financing Receivable, Recorded Investment, Current	67,994	86,373
Loans and Leases Receivable, Net	72,658	96,452
Acquired (covered) | Commercial construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	39	201
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	34	38
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	737	5,111
Financing Receivable, Recorded Investment, Total Past Due	810	5,350
Financing Receivable, Recorded Investment, Current	9,612	12,981
Loans and Leases Receivable, Net	10,422	18,331
Acquired (covered) | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	48	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	27	47
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	145	640
Financing Receivable, Recorded Investment, Total Past Due	220	687
Financing Receivable, Recorded Investment, Current	3,589	5,232
Loans and Leases Receivable, Net	3,809	5,919
Acquired (covered) | Residential construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due		0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due		0
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due		0
Financing Receivable, Recorded Investment, Nonaccrual Status		0
Financing Receivable, Recorded Investment, Total Past Due		0
Financing Receivable, Recorded Investment, Current		16
Loans and Leases Receivable, Net		16
Acquired (covered) | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	254	313
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	28
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	6,073	9,818
Financing Receivable, Recorded Investment, Total Past Due	6,327	10,159
Financing Receivable, Recorded Investment, Current	43,371	54,865
Loans and Leases Receivable, Net	49,698	65,024
Acquired (covered) | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	26	8
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	2
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	30	90
Financing Receivable, Recorded Investment, Total Past Due	56	100
Financing Receivable, Recorded Investment, Current	816	1,819
Loans and Leases Receivable, Net	872	1,919
Acquired (covered) | Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	956	1,667
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	61	963
Financing Receivable, Recorded Investment, Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	11,060	23,745
Financing Receivable, Recorded Investment, Total Past Due	12,077	26,375
Financing Receivable, Recorded Investment, Current	125,382	161,286
Loans and Leases Receivable, Net	$137,459	$187,661

Recovered_Sheet2

Loans and Allowance for Loan Losses - Financing Receivable Credit Quality indicators (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	$3,075,098	$2,276,517
Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	3,075,098	2,276,517
Pass Credits	2,803,863	1,994,993
Special Mention	156,589	137,550
Substandard	112,853	133,648
Doubtful	1,793	10,326
Loss	0	0
Originated | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	1,181,492	1,014,633
Pass Credits	1,100,361	930,554
Special Mention	46,935	37,685
Substandard	34,196	46,394
Doubtful	0	0
Loss	0	0
Originated | Commercial construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	265,968	202,140
Pass Credits	256,987	175,365
Special Mention	5,530	13,113
Substandard	3,451	13,662
Doubtful	0	0
Loss	0	0
Originated | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	154,132	139,567
Pass Credits	145,722	131,658
Special Mention	3,980	5,411
Substandard	4,430	2,498
Doubtful	0	0
Loss	0	0
Originated | Leases
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	21,100	16,137
Pass Credits	21,100	16,137
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	43,298	29,636
Pass Credits	42,806	28,160
Special Mention	143	1,120
Substandard	349	356
Doubtful	0	0
Loss	0	0
Originated | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	439,600	294,660
Pass Credits	407,319	258,042
Special Mention	20,946	19,234
Substandard	11,335	17,384
Doubtful	0	0
Loss	0	0
Originated | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	10,851	8,103
Pass Credits	10,331	7,807
Special Mention	428	177
Substandard	92	119
Doubtful	0	0
Loss	0	0
Originated | Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	2,116,441	1,704,876
Pass Credits	1,984,626	1,547,723
Special Mention	77,962	76,740
Substandard	53,853	80,413
Doubtful	0	0
Loss	0	0
Acquired (non-covered) | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	331,014	221,571
Pass Credits	295,238	195,526
Special Mention	23,456	17,343
Substandard	12,320	8,702
Doubtful	0	0
Loss	0	0
Acquired (non-covered) | Commercial construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	38,246	24,089
Pass Credits	29,975	21,126
Special Mention	5,258	922
Substandard	3,013	2,041
Doubtful	0	0
Loss	0	0
Acquired (non-covered) | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	34,391	23,453
Pass Credits	32,757	18,681
Special Mention	477	3,328
Substandard	1,157	1,444
Doubtful	0	0
Loss	0	0
Acquired (non-covered) | Residential construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	29,854	2,782
Pass Credits	28,833	2,782
Special Mention	0	0
Substandard	1,021	0
Doubtful	0	0
Loss	0	0
Acquired (non-covered) | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	383,120	108,239
Pass Credits	341,268	91,847
Special Mention	26,063	10,766
Substandard	15,548	5,626
Doubtful	241	0
Loss	0	0
Acquired (non-covered) | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	4,573	3,846
Pass Credits	4,494	3,760
Special Mention	79	62
Substandard	0	24
Doubtful	0	0
Loss	0	0
Acquired (non-covered) | Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	821,198	383,980
Pass Credits	732,565	333,722
Special Mention	55,333	32,421
Substandard	33,059	17,837
Doubtful	241	0
Loss	0	0
Acquired (covered) | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	72,658	96,452
Pass Credits	47,002	61,091
Special Mention	12,360	12,831
Substandard	13,211	17,929
Doubtful	85	4,601
Loss	0	0
Acquired (covered) | Commercial construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	10,422	18,331
Pass Credits	6,371	9,756
Special Mention	652	1,397
Substandard	3,307	6,751
Doubtful	92	427
Loss	0	0
Acquired (covered) | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	3,809	5,919
Pass Credits	3,282	4,231
Special Mention	167	796
Substandard	325	332
Doubtful	35	560
Loss	0	0
Acquired (covered) | Residential construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net		16
Pass Credits		0
Special Mention		16
Substandard		0
Doubtful		0
Loss		0
Acquired (covered) | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	49,698	65,024
Pass Credits	29,255	36,744
Special Mention	10,035	13,246
Substandard	9,068	10,296
Doubtful	1,340	4,738
Loss	0	0
Acquired (covered) | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	872	1,919
Pass Credits	762	1,726
Special Mention	80	103
Substandard	30	90
Doubtful	0	0
Loss	0	0
Acquired (covered) | Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net	137,459	187,661
Pass Credits	86,672	113,548
Special Mention	23,294	28,389
Substandard	25,941	35,398
Doubtful	1,552	10,326
Loss	$0	$0

Recovered_Sheet3

Loans and Allowance for Loan Losses - Troubled Debt Restructurings on Financing Receivables (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$3,835	$5,093
Financing Receivables, Modifications, Allowance For Loan Losses Allocated	165	767
Commercial construction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,391	5,746
Financing Receivables, Modifications, Allowance For Loan Losses Allocated	16	520
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	651	662
Financing Receivables, Modifications, Allowance For Loan Losses Allocated	25	36
Residential mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,641	7,170
Financing Receivables, Modifications, Allowance For Loan Losses Allocated	592	476
Consumer and other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	126	142
Financing Receivables, Modifications, Allowance For Loan Losses Allocated	13	11
Total Troubled Debt Restructurings
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	13,644	18,813
Financing Receivables, Modifications, Allowance For Loan Losses Allocated	811	1,810
Total Number Of Contracts	35	53
Accrual | Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,835	3,986
Accrual | Commercial construction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,341	5,472
Accrual | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	651	662
Accrual | Residential mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,625	6,545
Accrual | Consumer and other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	126	105
Accrual | Total Troubled Debt Restructurings
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	13,578	16,770
Total Number Of Contracts	33	43
Nonaccrual | Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	1,107
Nonaccrual | Commercial construction
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	50	274
Nonaccrual | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	0
Nonaccrual | Residential mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	16	625
Nonaccrual | Consumer and other
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	37
Nonaccrual | Total Troubled Debt Restructurings
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$66	$2,043
Total Number Of Contracts	2	10

Recovered_Sheet4

Loans and Allowance for Loan Losses - Troubled Debt Restructurings by Modification Category (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Commercial Real Estate	$1,300	$2,115
Commercial Real Estate Construction	447	1,107
Commercial and Industrial	153	665
Residential Mortgage	1,234	2,185
Consumer and Other	10	23
Total Modifications	3,144	6,095
Term Modification
Financing Receivable, Modifications [Line Items]
Commercial Real Estate	0	648
Commercial Real Estate Construction	0	0
Commercial and Industrial	153	129
Residential Mortgage	0	84
Consumer and Other	0	23
Total Modifications	153	884
Interest Only Modification
Financing Receivable, Modifications [Line Items]
Commercial Real Estate	0	331
Commercial Real Estate Construction	447	152
Commercial and Industrial	0	536
Residential Mortgage	479	1,076
Consumer and Other	0	0
Total Modifications	926	2,095
Payment Modification
Financing Receivable, Modifications [Line Items]
Commercial Real Estate	1,300
Commercial Real Estate Construction	0
Commercial and Industrial	0
Residential Mortgage	0
Consumer and Other	10
Total Modifications	1,310
Combination Modification
Financing Receivable, Modifications [Line Items]
Commercial Real Estate	0	1,035
Commercial Real Estate Construction	0	827
Commercial and Industrial	0	0
Residential Mortgage	755	573
Consumer and Other	0	0
Total Modifications	755	2,435
Rate Modification
Financing Receivable, Modifications [Line Items]
Commercial Real Estate		101
Commercial Real Estate Construction		128
Commercial and Industrial		0
Residential Mortgage		452
Consumer and Other		0
Total Modifications		$681

Recovered_Sheet5

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
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Residential construction
Financing Receivable, Modifications [Line Items]
Financing Receivable Subsequent Default	$0	$630
Commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable Subsequent Default	1,210	0
Commercial construction
Financing Receivable, Modifications [Line Items]
Financing Receivable Subsequent Default	1,245	5,906
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable Subsequent Default	0	29
Residential mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable Subsequent Default	$129	$688

Recovered_Sheet6

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 $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Loans Receivable Held-for-sale, Net	$37,280	$30,899	$57,414
Proceeds from sales of loans held for sale	292,497	352,130	233,276
Mortgage fees	$7,689	$8,979	$6,169

Recovered_Sheet7

Loans and Allowance for Loan Losses - Narrative (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Loans and Leases Receivable, Deferred Income	$900,000	$2,300,000
Business Combination, Acquired Receivables, Gross Contractual Amount	579,200,000
Business Combination, Acquired Receivables, Fair Value	553,100,000
Business Combination, Acquired Receivables, Discount Amortized Over Life of Loans	26,100,000
Loans and Leases Receivable, Collateral for Secured Borrowings	1,100,000,000	759,200,000
Loans and Leases Receivable, Impaired, Commitment to Lend	$0	$0

FDIC_Indemnification_Asset_FDI

FDIC Indemnification Asset - FDIC Indemnification Asset Roll Forward (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
FDIC Indemnification Asset [Abstract]
Description of Regulatory Assistance	80.00%
FDIC Indemnification Asset [Roll Forward]
FDIC Indemnification Asset, Beginning Balance	$16,886	$53,519
Accretion of Present Value Discount, Net	1,061	192
FDIC Indemnification Asset, Acquisitions	-2,920	-2,248
Receipt of Payments from FDIC	-9,930	-34,577
FDIC Indemnification Asset, Ending Balance	$5,097	$16,886

Goodwill_and_Other_Intangibles2

Goodwill and Other Intangibles - Schedule of Intangible Assets and Goodwill (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill and Intangible Assets [Roll Forward]
Beginning Balance	$34,966	$32,193
Acquisitions	51,075	3,949
Amortization of Intangible Assets	-2,340	-1,176	-567
Ending Balance	83,701	34,966	32,193
Finite-lived Intangible Assets [Roll Forward]
Beginning Balance	6,582	5,082
Acquisitions	9,710	2,676
Amortization of Intangible Assets	-2,340	-1,176	-567
Ending Balance	13,952	6,582	5,082
Goodwill [Roll Forward]
Beginning Balance	28,384	27,111
Acquisitions	41,365	1,273
Ending Balance	$69,749	$28,384	$27,111

Goodwill_and_Other_Intangibles3

Goodwill and Other Intangibles - Schedule of Finite-Lived Intangible Assets (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$13,952	$6,582	$5,082
Core Deposits
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	19,624	9,914
Finite-Lived Intangible Assets, Accumulated Amortization	-5,672	-3,332
Finite-Lived Intangible Assets, Net	$13,952	$6,582

Goodwill_and_Other_Intangibles4

Goodwill and Other Intangibles Schedule of Expected Amortization Expense (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$3,148
Finite-Lived Intangible Assets, Amortization Expense, Year Two	2,639
Finite-Lived Intangible Assets, Amortization Expense, Year Three	2,361
Finite-Lived Intangible Assets, Amortization Expense, Year Four	2,361
Finite-Lived Intangible Assets, Amortization Expense, Year Five	2,035
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	1,408
Finite-Lived Intangible Assets, Net	$13,952	$6,582	$5,082

Goodwill_and_Other_Intangibles5

Goodwill and Other Intangibles Additional Information (Details)	12 Months Ended
	Dec. 31, 2014
Goodwill and Other Intangibles [Abstract]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years 5 months 16 days

Premises_and_Equipment_Additio

Premises and Equipment Additional Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Premises and Equipment [Abstract]
Depreciation, Depletion and Amortization	$5.30	$4.20	$3
Operating Leases, Rent Expense	$3.80	$3.10	$2.40

Premises_and_Equipment_Summary

Premises and Equipment Summary of Premises and Equipment (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Abstract]
Land	$26,397	$23,264
Buildings and leasehold improvements	60,188	49,689
Furniture, fixtures and equipment	23,161	20,290
Construction in progress	114	178
Premises and equipment, gross	109,860	93,421
Less accumulated depreciation and amortization, Property, Plant, and Equipment	-22,099	-17,295
Premises and equipment, net	$87,761	$76,126

Premises_and_Equipment_Schedul

Premises and Equipment Schedule of Operating Lease Commitments (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Property, Plant and Equipment [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$4,002
Operating Leases, Future Minimum Payments, Due in Two Years	3,481
Operating Leases, Future Minimum Payments, Due in Three Years	3,064
Operating Leases, Future Minimum Payments, Due in Four Years	2,818
Operating Leases, Future Minimum Payments, Due in Five Years	2,461
Operating Leases, Future Minimum Payments, Due Thereafter	6,843
Operating Leases, Future Minimum Payments Due	$22,669

Derivatives_Schedule_of_Intere

Derivatives - Schedule of Interest Rate Derivatives (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Interest Rate Derivatives [Line Items]
Derivative Asset, Fair Value, Gross Asset	$1,754	$3,788
Designated as Hedging Instrument
Interest Rate Derivatives [Line Items]
Derivative Asset, Fair Value, Gross Asset		2,744
Derivative Asset, Notional Amount		375,000
Designated as Hedging Instrument | Interest Rate Cap
Interest Rate Derivatives [Line Items]
Derivative Asset, Notional Amount		250,000
Designated as Hedging Instrument | Interest Rate Cap | Other Assets
Interest Rate Derivatives [Line Items]
Derivative Asset, Fair Value, Gross Asset		0
Designated as Hedging Instrument | Interest Rate Swap
Interest Rate Derivatives [Line Items]
Derivative Asset, Notional Amount	125,000	125,000
Designated as Hedging Instrument | Interest Rate Swap | Other Assets
Interest Rate Derivatives [Line Items]
Derivative Asset, Fair Value, Gross Asset		2,744
Designated as Hedging Instrument | Interest Rate Swap | Accrued Expenses and Other Liabilities
Interest Rate Derivatives [Line Items]
Derivative Liability, Fair Value, Gross Liability	308
Not Designated as Hedging Instrument
Interest Rate Derivatives [Line Items]
Derivative Asset, Fair Value, Gross Asset	723	522
Derivative Asset, Notional Amount	34,692	31,221
Not Designated as Hedging Instrument | Interest Rate Cap
Interest Rate Derivatives [Line Items]
Derivative Asset, Notional Amount	0	3,256
Not Designated as Hedging Instrument | Interest Rate Cap | Other Assets
Interest Rate Derivatives [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	98
Not Designated as Hedging Instrument | Interest Rate Swap
Interest Rate Derivatives [Line Items]
Derivative Asset, Notional Amount	34,692	27,965
Derivative Liability, Notional Amount	34,692	31,221
Not Designated as Hedging Instrument | Interest Rate Swap | Other Assets
Interest Rate Derivatives [Line Items]
Derivative Asset, Fair Value, Gross Asset	723	424
Not Designated as Hedging Instrument | Interest Rate Swap | Accrued Expenses and Other Liabilities
Interest Rate Derivatives [Line Items]
Derivative Liability, Fair Value, Gross Liability	$723	$522

Derivatives_Summary_of_Offsett

Derivatives - Summary of Offsetting Assets and Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$1,754	$3,788
Derivative Asset	1,754	3,788
Derivative, Collateral, Right to Reclaim Cash	1,031	1,452
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	723	2,336
Derivative Assets
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	723	3,266
Derivative Asset	723	3,266
Derivative, Collateral, Right to Reclaim Cash	0	930
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	723	2,336
Derivative Liabilities
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,031	522
Derivative Asset	1,031	522
Derivative, Collateral, Right to Reclaim Cash	1,031	522
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 $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Amount of net gain (losses) recorded in OCI (effective portion)	($1,923)	$1,662	($364)
Amount of net loss reclassified from OCI to earnings	$286	$6,103	$4,878

Derivatives_Narrative_Details

Derivatives - Narrative (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2009	Mar. 31, 2013
Derivative [Line Items]
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)	($1,923,000)	$1,662,000	($364,000)
Accumulated other comprehensive income	-10,182,000	-3,306,000	-5,429,000
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	0
Derivative, Net Liability Position, Aggregate Fair Value	1,000,000
Collateral Already Posted, Aggregate Fair Value	3,200,000
2009 Interest Rate Cap Derivative Contract
Derivative [Line Items]
Derivative, Term of Contract				5 years
Derivative, Notional Amount				250,000,000
Amount Designated To Unsecured Variable Rate Money Market Funding Arrangement				250,000,000
Derivative, Maturity Date				16-Feb-14
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
Derivative, Maturity Date					18-Mar-19
Derivative, Inception Date					16-Sep-14
Derivative, Description of Variable Rate Basis					one-month LIBOR
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Derivative [Line Items]
Accumulated other comprehensive income	196,000	-1,441,000	6,324,000
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Notional Amount	34,692,000	31,221,000
Interest Rate Swap | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Notional Amount	34,692,000	27,965,000
Accrued Expenses and Other Liabilities | Interest Rate Swap | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	$723,000	$522,000

Deposits_Maturities_of_Time_De

Deposits Maturities of Time Deposits (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Time Deposits by Maturity [Line Items]
Time Deposit Maturities, Next Twelve Months	$745,923
Time Deposit Maturities, Year Two	155,314
Time Deposit Maturities, Year Three	148,330
Time Deposit Maturities, Year Four	121,904
Time Deposit Maturities, Year Five	30,833
Time Deposit Maturities, after Year Five	1,370
Time deposits	1,203,674	1,082,799
Time Deposits Less than $100,000 [Member]
Time Deposits by Maturity [Line Items]
Time Deposit Maturities, Next Twelve Months	250,746
Time Deposit Maturities, Year Two	42,616
Time Deposit Maturities, Year Three	28,946
Time Deposit Maturities, Year Four	13,442
Time Deposit Maturities, Year Five	4,332
Time Deposit Maturities, after Year Five	103
Time deposits	340,185
Time Deposits Greater than $100,000 [Member]
Time Deposits by Maturity [Line Items]
Time Deposit Maturities, Next Twelve Months	495,177
Time Deposit Maturities, Year Two	112,698
Time Deposit Maturities, Year Three	119,384
Time Deposit Maturities, Year Four	108,462
Time Deposit Maturities, Year Five	26,501
Time Deposit Maturities, after Year Five	1,267
Time deposits	$863,489

Borrowings_Schedule_of_Short_T

Borrowings - Schedule of Short Term Borrowings (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]
Securities Sold under Agreements to Repurchase	$25,834	$27,202
Federal Home Loan Bank, Advances, Short-term	102,100	97,300
Federal Funds Purchased	0	1,090
Short-term Debt	$127,934	$125,592

Borrowings_Schedule_of_LongTer

Borrowings - Schedule of Long-Term Debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]
FHLB advances	$52,000	$51,100
Subordinated notes	60,000	0
Unsecured Debt	0	28,875
Junior subordinated debenture	23,713	23,713
Long-term Debt, Gross	135,713	103,688
FHLB Prepayment Penalty	1,899	2,179
Long-term debt	$133,814	$101,509

Borrowings_Additional_Informat

Borrowings Additional Information (Details) (USD $)	0 Months Ended	12 Months Ended
	Nov. 14, 2014	Dec. 31, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Federal Funds Line of Credit		$90,000,000
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available		548,300,000
Federal Home Loan Bank, Advances, Weighted Average Interest Rate		2.83%	2.46%
Federal Reserve Bank Amount Of Available Unused Funds		169,900,000
Weighted Average Rate Trust Preferred Debentures		2.71%	2.86%
Federal Funds Borrowed		0
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Line of Credit Facility, Expiration Period	364 days
Line of Credit Facility, Maximum Borrowing Capacity	15,000,000
Long-term Line of Credit		0
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Short-term Debt [Line Items]
Equity Method Investments		700,000	700,000
Federal Funds Rate [Member] | Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.05%
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		824,300,000
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
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		8,400,000
Total commercial | Federal Reserve Bank [Member]
Short-term Debt [Line Items]
Fair Value of Securities Received as Collateral that Can be Resold or Repledged		272,600,000
September Two Thousand Fourteen Subordinated Notes [Member] | Subordinated Debt [Member]
Short-term Debt [Line Items]
Debt Instrument, Face Amount		$60,000,000
Debt Instrument, Interest Rate, Stated Percentage		5.50%
Debt Instrument, Interest Rate, Duration of Fixed Rate Terms		5 years
September Two Thousand Fourteen Subordinated Notes [Member] | Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]
Short-term Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate		3.59%

Borrowings_Summary_of_Addition

Borrowings Summary of Additional Information on Short Term Borrowings (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Borrowings [Abstract]
Short-term Debt, Maximum Amount Outstanding During Period	$195,941	$143,674	$40,149
Short-term Debt, Average Outstanding Amount	$96,043	$88,635	$30,573
Short Term Debt Average Interest Rate During Year	0.45%	0.49%	1.11%
Short Term Debt Average Interest Rate at End of Year	0.28%	0.39%	0.51%

Borrowings_Schedule_of_Federal

Borrowings Schedule of Federal Home Loan Bank Advances (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Federal Home Loan Bank, Advances [Line Items]
FHLB advances	$52,000	$51,100
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%
July 2018 1.78% [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances	3,000	0
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	1.78%
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 2016 0.88% [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances	2,000	0
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	0.88%
August 2015 2.37% [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances	0	6,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	2.37%
January 2015 1.00% [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances	0	100
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	1.00%
August 2016 1.72% [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances	2,000	0
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 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%

Borrowings_Schedule_of_Junior_

Borrowings Schedule of Junior Subordinated Debt Instruments (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Subordinated Borrowing [Line Items]
Junior subordinated debenture	$23,713	$23,713
BNC Bancorp Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Issuance Date	3-Apr-03
Debentures Shares Issued	5,000
Debt Instrument, Maturity Date	15-Apr-33
Junior subordinated debenture	5,155	5,155
BNC Bancorp Capital Trust II [Member] [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Issuance Date	11-Mar-04
Debentures Shares Issued	6,000
Debt Instrument, Maturity Date	7-Apr-34
Junior subordinated debenture	6,186	6,186
BNC Bancorp Capital Trust III [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Issuance Date	23-Sep-04
Debentures Shares Issued	5,000
Debt Instrument, Maturity Date	23-Sep-34
Junior subordinated debenture	5,155	5,155
BNC Bancorp Capital Trust IV [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Issuance Date	27-Sep-06
Debentures Shares Issued	7,000
Debt Instrument, Maturity Date	31-Dec-36
Junior subordinated debenture	$7,217	$7,217
London Interbank Offered Rate (LIBOR) [Member] | BNC Bancorp Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Derivative, Basis Spread on Variable Rate	3.25%
London Interbank Offered Rate (LIBOR) [Member] | BNC Bancorp Capital Trust II [Member] [Member]
Subordinated Borrowing [Line Items]
Derivative, Basis Spread on Variable Rate	2.80%
London Interbank Offered Rate (LIBOR) [Member] | BNC Bancorp Capital Trust III [Member]
Subordinated Borrowing [Line Items]
Derivative, Basis Spread on Variable Rate	2.40%
London Interbank Offered Rate (LIBOR) [Member] | BNC Bancorp Capital Trust IV [Member]
Subordinated Borrowing [Line Items]
Derivative, Basis Spread on Variable Rate	1.70%

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	$3,306	$5,429
Other Comprehensive Income Before Reclassifications	6,790	-7,963
Amounts Reclassified From Accumulated Other Comprehensive Income	86	5,840
Amounts Transferred Due To Securities Transferred From AFS To HTM		0
Total other comprehensive income (loss)	6,876	-2,123	4,419
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	10,182	3,306	5,429
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	-1,946	8,872
Other Comprehensive Income Before Reclassifications	8,713	-9,625
Amounts Reclassified From Accumulated Other Comprehensive Income	322	26
Amounts Transferred Due To Securities Transferred From AFS To HTM		-1,219
Total other comprehensive income (loss)	9,035	-10,818
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	7,089	-1,946
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss)	6,876	-2,123	4,419
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	3,811	2,881
Other Comprehensive Income Before Reclassifications	0	0
Amounts Reclassified From Accumulated Other Comprehensive Income	-522	-289
Amounts Transferred Due To Securities Transferred From AFS To HTM		1,219
Total other comprehensive income (loss)	-522	930
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	3,289	3,811
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	1,441	-6,324
Other Comprehensive Income Before Reclassifications	-1,923	1,662
Amounts Reclassified From Accumulated Other Comprehensive Income	286	6,103
Amounts Transferred Due To Securities Transferred From AFS To HTM		0
Total other comprehensive income (loss)	-1,637	7,765
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	($196)	$1,441

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income - Reclassification Out of Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense (benefit)	($10,365)	($4,045)	$1,700
Amounts Reclassified From Accumulated Other Comprehensive Income	-86	-5,840
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	522	289
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	522	289
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts Reclassified From Accumulated Other Comprehensive Income	-322	-26
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	-322	-26
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	-286	-6,103
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	-286	-6,103
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	-511	-42
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	829	623
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)	-307	-334
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)	189	-16
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)	171	3,760
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	($457)	($9,863)

Fair_Value_Measurements_Schedu

Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities, Measured on Recurring Basis (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
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	$269,290	$270,417
Derivative Asset, Fair Value, Gross Asset	1,754	3,788
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	676	922
Derivative Instruments in Hedges, Liabilities, at Fair Value	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	268,614	269,495
Derivative Instruments in Hedges, Liabilities, at Fair Value	308
Derivative Liability	723	522
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
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	269,290	270,417
Derivative Asset, Fair Value, Gross Asset	723	3,266
Assets, Fair Value Disclosure, Recurring	270,013	273,683
Liabilities, Fair Value Disclosure, Recurring	1,031	522
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	676	922
Derivative Asset, Fair Value, Gross Asset	0	0
Assets, Fair Value Disclosure, Recurring	676	922
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	268,614	269,495
Derivative Asset, Fair Value, Gross Asset	723	3,266
Assets, Fair Value Disclosure, Recurring	269,337	272,761
Liabilities, Fair Value Disclosure, Recurring	1,031	522
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	17,888	15,061
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	17,888	15,061
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	17,888	15,061
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	188,935	191,263
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	188,935	191,263
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	13,615	8,889
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	13,615	8,889
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	13,615	8,889
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	12,566	4,380
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	12,566	4,380
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	12,566	4,380
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	5,909	922
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	5,909	922
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	676	922
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	5,233	0
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	28,274	42,014
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	28,274	42,014
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	28,274	42,014
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	2,103	7,888
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	2,103	7,888
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	2,103	7,888
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 in Hedges, Assets, at Fair Value		2,744
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	723	424
Derivative Instruments in Hedges, Liabilities, at Fair Value	308
Derivative Liability	723	522
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 in Hedges, Assets, at Fair Value		0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	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 in Hedges, Assets, at Fair Value		2,744
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	723	424
Derivative Instruments in Hedges, Liabilities, at Fair Value	308
Derivative Liability	723	522
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 in Hedges, Assets, at Fair Value		0
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0
Derivative Liability	0	0
Interest Rate Cap | 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		98
Interest Rate Cap | 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
Interest Rate Cap | 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		98
Interest Rate Cap | 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

Fair_Value_Measurements_Summar

Fair Value Measurements - Summary of Fair Value Measurements, Nonrecurring (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Financing Receivable, Recorded Investment	$190,247
Other Real Estate	42,531
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	37,280	30,899
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	37,280	30,899
Impaired Financing Receivable, Recorded Investment	190,247	228,736
Other Real Estate	42,531	47,606
Assets, Fair Value Disclosure, Nonrecurring	270,058	307,241
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	37,280	30,899
Impaired Financing Receivable, Recorded Investment	0	0
Other Real Estate	0	0
Assets, Fair Value Disclosure, Nonrecurring	37,280	30,899
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	190,247	228,736
Other Real Estate	42,531	47,606
Assets, Fair Value Disclosure, Nonrecurring	$232,778	$276,342

Fair_Value_Measurements_Summar1

Fair Value Measurements - Summary of Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired Financing Receivable, Recorded Investment	190,247
Other Real Estate	42,531
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 $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities available-for-sale, at fair value	$269,290	$270,417
Held-to-maturity Securities, Fair Value	241,997	236,507
Accrued interest receivable	14,514	12,955
FDIC indemnification asset	5,097	16,886	53,519
Bank Owned Life Insurance	93,396	78,439
Derivative Asset	1,754	3,788
Time deposits	1,203,674	1,082,799
Short-term Debt	127,934	125,592
Long-term debt	133,814	101,509
Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	85,194	108,390
Investment securities available-for-sale, at fair value	269,290	270,417
Held-to-maturity Securities, Fair Value	241,997	236,507
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	10,562	10,720
Loans Held-for-sale, Fair Value Disclosure	37,280	30,899
Loans Receivable, Fair Value Disclosure	3,070,477	2,266,455
Accrued interest receivable	14,514	12,955
FDIC indemnification asset	5,097	16,886
Bank Owned Life Insurance	93,396	78,439
Demand deposits and savings	2,192,723	1,623,931
Time deposits	1,218,869	1,087,333
Short-term Debt	127,934	125,592
Long-term debt	131,417	97,983
Interest Payable	2,011	1,434
Derivative Instruments in Hedges, Liabilities, at Fair Value	308
Derivative Liability	723	522
Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	85,194	108,390
Investment securities available-for-sale, at fair value	269,290	270,417
Held-to-maturity Securities, Fair Value	237,092	247,378
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	10,562	10,720
Loans Held-for-sale, Fair Value Disclosure	37,280	30,899
Loans Receivable, Fair Value Disclosure	3,044,699	2,243,642
Accrued interest receivable	14,514	12,955
FDIC indemnification asset	5,097	16,886
Bank Owned Life Insurance	93,396	78,439
Demand deposits and savings	2,192,723	1,623,931
Time deposits	1,203,674	1,082,799
Short-term Debt	127,934	125,592
Long-term debt	133,814	101,509
Interest Payable	2,011	1,434
Derivative Instruments in Hedges, Liabilities, at Fair Value	308
Derivative Liability	723	522
Fair Value, Inputs, Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	85,194	108,390
Investment securities available-for-sale, at fair value	676	922
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
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	268,614	269,495
Held-to-maturity Securities, Fair Value	241,997	236,507
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	10,562	10,720
Loans Held-for-sale, Fair Value Disclosure	37,280	30,899
Loans Receivable, Fair Value Disclosure	2,880,230	2,037,719
Accrued interest receivable	14,514	12,955
FDIC indemnification asset	0	0
Bank Owned Life Insurance	93,396	78,439
Demand deposits and savings	2,192,723	1,623,931
Time deposits	1,218,869	1,087,333
Short-term Debt	127,934	125,592
Long-term debt	131,417	97,983
Interest Payable	2,011	1,434
Derivative Instruments in Hedges, Liabilities, at Fair Value	308
Derivative Liability	723	522
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	190,247	228,736
Accrued interest receivable	0	0
FDIC indemnification asset	5,097	16,886
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
Derivative Liability	0	0
Interest Rate Swap | Designated as Hedging Instrument | Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset		2,744
Interest Rate Swap | Designated as Hedging Instrument | Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset		2,744
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	723	424
Interest Rate Swap | Not Designated as Hedging Instrument | Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset	723	424
Interest Rate Swap | Fair Value, Inputs, Level 1 | Designated as Hedging Instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset		0
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 | Designated as Hedging Instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset		2,744
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	723	424
Interest Rate Swap | Fair Value, Inputs, Level 3 | Designated as Hedging Instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset		0
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
Interest Rate Cap | Not Designated as Hedging Instrument | Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset		98
Interest Rate Cap | Not Designated as Hedging Instrument | Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset		98
Interest Rate Cap | Fair Value, Inputs, Level 1 | Not Designated as Hedging Instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset		0
Interest Rate Cap | Fair Value, Inputs, Level 2 | Not Designated as Hedging Instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset		98
Interest Rate Cap | Fair Value, Inputs, Level 3 | Not Designated as Hedging Instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset		$0

Regulatory_Capital_Schedule_of

Regulatory Capital Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
BNC Bancorp [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital to Risk Weighted Assets	12.49%	11.57%
Tier One Risk Based Capital to Risk Weighted Assets	9.71%	10.33%
Tier One Leverage Capital to Average Assets	8.41%	8.12%
Bank of North Carolina [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital	390,900	313,624
Capital to Risk Weighted Assets	12.21%	12.66%
Capital Required for Capital Adequacy	256,200	198,187
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Capital Required to be Well Capitalized	320,250	247,734
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Tier One Risk Based Capital	360,457	282,634
Tier One Risk Based Capital to Risk Weighted Assets	11.26%	11.41%
Tier One Risk Based Capital Required for Capital Adequacy	128,100	99,094
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%	4.00%
Tier One Risk Based Capital Required to be Well Capitalized	192,150	148,640
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	6.00%
Tier One Leverage Capital to Average Assets	9.74%	8.96%
Tier One Leverage Capital Required for Capital Adequacy	147,992	126,118
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized	184,990	157,647
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%

Income_Taxes_Schedule_of_Compo

Income Taxes Schedule of Components of Income Tax Expense (Benefit) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)	$9,159	($314)	($140)
Current State and Local Tax Expense (Benefit)	1,257	554	350
Current Income Tax Expense (Benefit)	10,416	240	210
Deferred Federal Income Tax Expense (Benefit)	-1,181	2,382	-2,244
Deferred State and Local Income Tax Expense (Benefit)	1,130	1,423	334
Deferred Income Tax Expense (Benefit)	-51	3,805	-1,910
Income tax expense (benefit)	$10,365	$4,045	($1,700)

Income_Taxes_Schedule_of_Effec

Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax at statutory federal tax rate	$13,517	$7,239	$2,976
State income tax, net of federal benefit	1,575	1,304	451
Tax exempt interest income	4,485	4,008	3,241
Income from life insurance	810	789	601
Gain on acquisition	0	0	-1,690
Other	568	299	405
Income tax expense (benefit)	$10,365	$4,045	($1,700)

Income_Taxes_Schedule_of_Defer

Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]
Allowance for loan losses	$14,996	$10,660
Net operating loss carryforwards	9,595	10,593
Deferred compensation	2,229	2,203
Deferred Tax Assets, Derivative Instruments	114	0
Other real estate owned writedowns	3,519	3,536
AMT credit carryforward	12,033	3,488
Interest on nonaccrual loans	270	110
Stock-based compensation	971	546
Fair value adjustments from acquisitions	16,332	6,273
Deferred Tax Assets, Other	1,699	1,089
Deferred Tax Assets, Gross	61,758	38,498
Premised and equipment	4,030	2,978
Leasing activities	728	702
Unrealized gains on investment securities and derivatives	4,163	2,110
Deferred loan costs and fees	1,950	979
Core deposit intangibles	5,037	2,306
Fdic Acquisition	337	4,424
Deferred Tax Liabilities, Other	1,629	1,554
Deferred Tax Liabilities, Net	17,874	15,053
Deferred Tax Assets, Valuation Allowance	2,906	360
Deferred Tax Assets, Net	$40,978	$23,085

Income_Taxes_Additional_Inform

Income Taxes Additional Information (Details) (USD $)	0 Months Ended
	Jan. 02, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Examination [Line Items]
Deferred Tax Assets, Valuation Allowance		$2,906,000	$360,000
Operating Loss Carryforwards		19,900,000
Unrecognized Tax Benefits		$0	$0
Subsequent Event [Member] | NORTH CAROLINA | State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	5.00%

Commitments_and_Contingencies_1

Commitments and Contingencies - Schedule of Fair Value Off Balance Sheet Risks (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
Commitments under unfunded loans and lines of credit	$663,137	$377,021
Letters of credit	6,607	7,926
Unused credit card lines	$4,512	$4,120

Commitments_and_Contingencies_2

Commitments and Contingencies - Narrative (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
Commitment to Purchase Limited Partnership Interest	$8.80	$8.80
Unfunded Commitment to Purchase Limited Partnership Interest	$5.60	$7.50

Employee_Benefits_Disclosure_o

Employee Benefits - Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award (Details) (Employee Stock Option, USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	412,337
Exercised (in shares)	74,559
Forfeited or expired (in shares)	0
Outstanding, end of period (in shares)	337,778
Exercisable at December 31, 2013 (in shares)	336,354
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)	$11.34
Exercised (in shares)	$11.23
Forfeited or expired (in shares)	$0
Outstanding, end of period (in shares)	$11.37
Exercisable at December 31, 2013 (in shares)	$11.37
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 2 months 26 days
Exercisable at December 31, 2013 (dollars per share)	2 years 2 months 23 days
Share options expected to vest (dollars per share)	5 years 3 months 7 days
Aggregate intrinsic value	$1,734
Exercisable at December 31, 2013	1,725
Share options expected to vest	$10

Employee_Benefits_Schedule_of_

Employee Benefits - Schedule of Nonvested Restricted Stock Units Activity (Details) (Restricted Stock, USD $)	12 Months Ended
	Dec. 31, 2014
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)	303,396
Granted (in shares)	461,653
Vested (in shares)	-160,780
Forfeited (in shares)	-3,001
Restricted stock nonvested, end of period (in shares)	601,268
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)	$9.58
Granted (dollars per share)	$16.90
Vested (dollars per share)	$10.62
Forfeited (dollars per share)	$14.60
Restricted stock nonvested, end of period (dollars per share)	$14.90

Employee_Benefits_Narrative_De

Employee Benefits - Narrative (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Grants in Period, Gross	0	0	0
Options, Exercises in Period, Intrinsic Value	$400,000	$0	$100,000
Options, Vested in Period, Fair Value	0	0	300,000
Cash Received from Exercise of Stock Options	200,000	0	300,000
Tax Benefit Realized from Exercise of Stock Options	100,000	0
Fair value of restricted stock, vested in period	1,700,000	900,000	300,000
Required Age of Employee	20 years 6 months
Employer Matching Contribution, Percent of Match	50.00%
Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Employers Matching Contribution, Annual Vesting Percentage	20.00%
Defined Contribution Plan, Cost Recognized	1,000,000	900,000	800,000
Defined Benefit Plan, Benefits Paid	400,000	300,000	600,000
Defined Benefit Plan, Benefit Obligation	7,400,000	6,300,000
Deferred Compensation Arrangement with Individual, Compensation Expense	100,000	400,000	500,000
Common Stock, Shares Held in Employee Trust, Shares	353,207	339,448
2006 Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Rights issued	247,187
2013 Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Options (in shares)	461,573
Shares available	970,673
KeySource Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Options (in shares)	230,285
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Options (in shares)	337,778	412,337
Compensation Cost Not yet Recognized, Period for Recognition	4 months 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 7 months 6 days
Allocated Share-based Compensation Expense	2,200,000	1,200,000	500,000
Compensation Cost Not yet Recognized	$7,700,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employers Matching Contribution, Annual Vesting Percentage				100.00%
Subsequent Event [Member] | Matching on 3%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer Matching Contribution, Percent of Match				100.00%
Employer Matching Contribution, Percent of Employees' Gross Pay				3.00%
Subsequent Event [Member] | Matching on 4%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer Matching Contribution, Percent of Match				50.00%
Employer Matching Contribution, Percent of Employees' Gross Pay				4.00%
Subsequent Event [Member] | Matching on 5%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer Matching Contribution, Percent of Match				50.00%
Employer Matching Contribution, Percent of Employees' Gross Pay				5.00%

Parent_Company_Financial_Data_1

Parent Company Financial Data Condensed Balance Sheets of Parent Company Only (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Cash and due from banks	$44,659	$35,474
Other assets	61,391	51,152
Total assets	4,072,508	3,229,576
Long-term debt	133,814	101,509
Total liabilities	3,682,120	2,958,246
Common stock, no par value; authorized 60,000,000 shares; 27,777,737 and 21,310,832 shares issued and outstanding at December 31, 2014 and 2013, respectively	281,488	181,684
Common stock, non-voting, no par value; authorized 20,000,000 shares; 4,820,844 and 5,992,213 shares issued and outstanding at December 31, 2014 and 2013, respectively	33,507	44,781
Retained earnings	65,211	41,559
Stock on directors rabbi trust	-3,429	-3,143
Directors deferred fees obligation	3,429	3,143
Accumulated other comprehensive income	10,182	3,306	5,429
Total shareholders' equity	390,388	271,330	282,244	163,855
Total liabilities and shareholders' equity	4,072,508	3,229,576
Parent Company [Member]
Cash and due from banks	9,717	1,392
Investment in bank subsidiary	462,659	320,941
Investment in Non Bank Subsidiaries	1,113	1,113
Other assets	1,493	622
Total assets	474,982	324,068
Other Liabilities	881	150
Long-term debt	83,713	52,588
Total liabilities	84,594	52,738
Common stock, no par value; authorized 60,000,000 shares; 27,777,737 and 21,310,832 shares issued and outstanding at December 31, 2014 and 2013, respectively	281,488	168,616
Common stock, non-voting, no par value; authorized 20,000,000 shares; 4,820,844 and 5,992,213 shares issued and outstanding at December 31, 2014 and 2013, respectively	33,507	57,849
Retained earnings	65,211	41,559
Stock on directors rabbi trust	-3,429	-3,143
Directors deferred fees obligation	3,429	3,143
Accumulated other comprehensive income	10,182	3,306
Total shareholders' equity	390,388	271,330
Total liabilities and shareholders' equity	$474,982	$324,068

Parent_Company_Financial_Data_2

Parent Company Financial Data Condensed Statements of Income for Parent Company Only (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Expense	$19,926,000	$30,063,000	$32,891,000
Net income	29,390,000	17,247,000	10,453,000
Parent Company [Member]
Dividends from bank subsidiary	29,612,000	13,760,000	3,675,000
Equity in undistributed earnings of bank subsidiary	3,336,000	5,434,000	8,094,000
Other income	647,000	625,000	626,000
Interest Expense	2,796,000	1,920,000	939,000
Other Expense	1,409,000	652,000	1,003,000
Net income	$29,390,000	$17,247,000	$10,453,000

Parent_Company_Financial_Data_3

Parent Company Financial Data Condensed Statements of Cash Flows for Parent Company Only (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Cash Flow Statements, Captions [Line Items]
Net income	$29,390	$17,247	$10,453
Depreciation and amortization	6,158	4,615	2,987
Net cash provided by operating activities	40,479	162,913	39,534
Net increase (decrease) in long-term-debt	58,332	23,786	-11,587
Redemption of common stock warrant	0	0	-940
Common stock issued from exercise of stock options	173	0	138
Common stock issued pursuant to dividend reinvestment plan	-336	-260	-225
Common stock repurchased	-5,081	0	0
Common stock repurchased in lieu of income taxes	-598	0	0
Cash dividends paid, net of accretion	-5,738	-5,853	-4,879
Net cash used in financing activities	-16,598	-145,711	-10,629
Net increase (decrease) in cash and cash equivalents	-23,196	-125,681	178,242
Cash and cash equivalents, beginning of year	108,390	234,071	55,829
Cash and cash equivalents, end of year	85,194	108,390	234,071
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net income	29,390	17,247	10,453
Equity in undistributed earnings of bank subsidiary	3,336	5,434	8,094
Depreciation and amortization	452	48	11
Increase (decrease) in other assets	1,323	472	-2
Increase (decrease) in other liabilities	828	-10,687	10,267
Net cash provided by operating activities	26,011	702	12,639
Net cash used in investment in subsidiaries	-37,903	0	-61,397
Proceeds (repayments) on short-term borrowings	0	0	-6,280
Net increase (decrease) in long-term-debt	31,125	26,440	2,460
Proceeds from issuance of preferred stock	0	-31,260	68,308
Redemption of common stock warrant	0	0	-940
Common stock issued from exercise of stock options	173	0	138
Tax benefit from exercise of stock options, net	0	0	17
Common stock issued pursuant to dividend reinvestment plan	336	260	225
Common stock repurchased	-5,081	0	0
Common stock repurchased in lieu of income taxes	-598	0	0
Cash dividends paid, net of accretion	-5,738	-5,853	-4,879
Net cash used in financing activities	20,217	-10,413	59,049
Net increase (decrease) in cash and cash equivalents	8,325	-9,711	10,291
Cash and cash equivalents, beginning of year	1,392	11,103	812
Cash and cash equivalents, end of year	$9,717	$1,392	$11,103