Quarterly Condensed Financial Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest and Fee Income, Loans and Leases	$ 45,346	$ 42,874	$ 40,029	$ 37,215	$ 39,463	$ 34,285	$ 38,559	$ 30,533	$ 165,464	$ 142,840	$ 116,394
Interest Expense	5,295	5,390	5,896	6,586	7,259	7,516	7,555	7,825	23,167	30,155	32,411
Net interest income (expense)	40,051	37,484	34,133	30,629	32,204	26,769	31,004	22,708	142,297	112,685	83,983
Provision for loan losses not covered under FDIC loss share	5,916	1,048	75	1,718	0	5,400	4,300	3,600	8,757	13,300	33,735
Provision for loan losses covered under FDIC loss share	653	10,889	206	2,285	(144)	2,672	275	0	14,033	2,803	0
Interest Income (Expense), after Provision for Loan Loss	33,482	25,547	33,852	26,626	32,348	18,697	26,429	19,108	119,507	96,582	50,248
Noninterest Income	(3,576)	7,832	845	3,983	601	8,726	4,218	4,963	9,084	18,508	18,360
Noninterest Expense	22,617	21,282	21,414	21,364	23,427	18,302	18,024	17,965	86,677	77,718	62,212
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	7,289	12,097	13,283	9,245	9,522	9,121	12,623	6,106	41,914	37,372	6,396
Income tax expense	1,874	4,167	4,517	3,060	2,316	3,289	4,350	1,994	13,618	11,949	823
Net income	5,415	7,930	8,766	6,185	7,206	5,832	8,273	4,112	28,296	25,423	5,573
Net income available to common shareholders	$ 4,153	$ 7,282	$ 8,122	$ 5,544	$ 6,570	$ 5,200	$ 7,643	$ 3,486	$ 25,101	$ 22,899	$ 3,106
Basic	$ 0.23	$ 0.41	$ 0.46	$ 0.31	$ 0.37	$ 0.29	$ 0.45	$ 0.23	$ 1.41	$ 1.37	$ 0.21
Diluted earnings per common share: (in dollars per share)	$ 0.23	$ 0.39	$ 0.44	$ 0.31	$ 0.36	$ 0.29	$ 0.43	$ 0.23	$ 1.37	$ 1.34	$ 0.21