Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Cash and cash equivalents:
Cash and due from banks	$ 140,855	$ 129,729	$ 87,319
Interest-bearing deposits with banks	2,294	1,822	1,088
Federal funds sold and securities purchased under agreements to resell	166,770	39,874	160,660
Total cash and cash equivalents	309,919	171,425	249,067
Investment securities:
Securities held to maturity (fair value of $17,743, $17,864, and $19,834, respectively)	16,567	16,569	19,100
Securities available for sale, at fair value	478,472	289,195	209,956
Other investments	16,099	18,292	20,427
Total investment securities	511,138	324,056	249,483
Loans held for sale	42,525	45,809	17,956
Loans:
Loans, net	2,958,227	2,791,779	2,711,229
FDIC receivable for loss share agreements	200,569	262,651	299,200
Premises and equipment, net	106,458	94,250	90,529
Other real estate owned (covered of $53,146, $65,849, and $74,591, respectively; non-covered of $31,263, $18,022, and $24,900, respectively)	84,409	83,871	99,491
Goodwill	66,542	62,888	62,888
Bank owned life insurance	35,543	22,111	21,836
Core deposit and other intangibles	13,429	11,538	12,027
Other assets	44,510	26,179	26,229
Total assets	4,373,269	3,896,557	3,839,935
Deposits:
Noninterest-bearing	806,235	658,454	598,112
Interest-bearing	2,854,737	2,596,018	2,607,716
Total deposits	3,660,972	3,254,472	3,205,828
Federal funds purchased and securities sold under agreements to repurchase	220,264	180,436	187,550
Other borrowings	46,105	46,683	46,275
Other liabilities	21,022	33,186	29,177
Total liabilities	3,948,363	3,514,777	3,468,830
Shareholders' equity:
Preferred stock - $.01 par value; authorized 10,000,000 shares; no shares issued and outstanding
Common stock - $2.50 par value; authorized 40,000,000 shares; 15,085,991, 14,039,422, and 13,987,686 shares issued and outstanding	37,715	35,099	34,969
Surplus	262,647	233,232	231,640
Retained earnings	126,304	116,198	105,799
Accumulated other comprehensive loss	(1,760)	(2,749)	(1,303)
Total shareholders' equity	424,906	381,780	371,105
Total liabilities and shareholders' equity	4,373,269	3,896,557	3,839,935
Acquired loans
Loans:
Loans, gross	560,058	402,201	379,341
Loans, allowance	(35,813)	(31,620)	(25,545)
Non-acquired loans
Loans:
Loans, gross	2,481,251	2,470,565	2,405,613
Loans, allowance	$ (47,269)	$ (49,367)	$ (48,180)