Acquisitions (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Nov. 30, 2012 As Recorded By First Trust [Member]	Nov. 30, 2012 First Trust Preliminary Fair Value Adjustments [Member]	Nov. 30, 2012 As Initially Recorded By BNC for First Trust Acquisition [Member]	Nov. 30, 2012 Measurement Period Adjustments First Trust Acquisition [Member]	Nov. 30, 2012 As Recorded By BNC For First Trust Acquisition [Member]	Sep. 14, 2012 As Recorded By KeySource [Member]	Sep. 14, 2012 KeySource Fair Value Adjustments [Member]	Sep. 14, 2012 As Recorded By BNC For KeySource Acquisition [Member]
Business Acquisition [Line Items]
Cash and Due From Banks							$ 46,079	$ 0	$ 46,079		$ 46,079	$ 19,847	$ 0	$ 19,847
Investment Securities Available for Sale							124,616	0	124,616		124,616	3,445	0	3,445
Federal Home Loan Bank Stock, at cost							753	0	753		753	430	0	430
Loans							179,702	(9,820)	169,882		169,882	148,295	(8,690)	139,605
Premises and Equipment							6,938	866	7,804		7,804	650	0	650
Accrued Interest Receivable							1,565	0	1,565		1,565	547	0	547
Other Real Estate Owned							8,686	(535)	8,151		8,151	1,289	(150)	1,139
FDIC Indemnification Asset	38,166	42,476	53,519	72,483	73,521	91,851
Core Deposit Intangible							0	1,826	1,826		1,826	0	621	621
Other Assets							12,337	3,295	15,632		15,632	4,445	3,516	7,961
Assets Acquired							380,676	(4,368)	376,308		376,308	178,948	(4,703)	174,245
Deposits							(323,139)	(884)	(324,023)		(324,023)	(151,553)	(854)	(152,407)
Short-Term Borrowings							(7,899)	0	(7,899)		(7,899)	(780)	0	(780)
Long-Term Debt												(5,999)	(48)	(6,047)
Other Liabilities							(2,849)	0	(2,849)	719	(2,130)	(1,754)	102	(1,652)
Total Liabilities Assumed							(333,887)	(884)	(334,771)	719	(334,052)	(160,086)	(800)	(160,886)
Net Assets Acquired											42,256			13,359
Bargain Purchase Gain											$ 5,691