Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest Income
Interest and fees on loans	$ 134,600	$ 112,320	$ 89,384
Interest and dividends on investment securities	6,824	6,181	6,992
Interest on balances with other banks and short-term investments	475	513	108
Interest on federal funds sold	44	110	174
Total interest income	141,943	119,124	96,658
Interest Expense
Interest on deposits	12,057	17,248	16,886
Interest on customer repurchase agreements	325	685	731
Interest on short-term borrowings	3		27
Interest on long-term borrowings	2,029	2,144	2,188
Total interest expense	14,414	20,077	19,832
Net Interest Income	127,529	99,047	76,826
Provision for Credit Losses	16,190	10,983	9,308
Net Interest Income After Provision For Credit Losses	111,339	88,064	67,518
Noninterest Income
Service charges on deposits	3,937	3,318	3,068
Gain on sale of loans	13,942	6,057	2,836
Gain on sale of investment securities	690	1,445	1,330
Loss on early extinguishment of debt	(529)
Increase in the cash surrender value of bank owned life insurance	392	401	430
Other income	2,932	2,280	1,578
Total noninterest income	21,364	13,501	9,242
Noninterest Expense
Salaries and employee benefits	43,684	34,518	25,511
Premises and equipment expenses	10,218	8,371	8,460
Marketing and advertising	1,759	1,626	1,058
Data processing	4,415	3,554	2,629
Legal, accounting and professional fees	4,253	3,974	2,987
FDIC insurance	2,089	2,195	2,692
Other expenses	10,113	9,038	7,668
Total noninterest expense	76,531	63,276	51,005
Income Before Income Tax Expense	56,172	38,289	25,755
Income Tax Expense	20,883	13,731	9,098
Net Income	35,289	24,558	16,657
Preferred Stock Dividends and Discount Accretion	566	1,511	1,299
Net Income Available to Common Shareholders	$ 34,723	$ 23,047	$ 15,358
Earnings Per Common Share
Basic (in Dollars per share)	$ 1.65	$ 1.16	$ 0.78
Diluted (in Dollars per share)	$ 1.61	$ 1.14	$ 0.77