Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Cash and cash equivalents:
Cash and due from banks	$ 105,851	$ 129,729	$ 134,942
Interest-bearing deposits with banks	2,341	1,822	1,530
Federal funds sold and securities purchased under agreements to resell	169,872	39,874	22,300
Total cash and cash equivalents	278,064	171,425	158,772
Investment securities:
Securities held to maturity (fair value of $17,750, $17,864, and $19,872, respectively)	16,568	16,569	18,699
Securities available for sale, at fair value	476,023	289,195	281,926
Other investments	7,996	18,292	20,422
Total investment securities	500,587	324,056	321,047
Loans held for sale	71,585	45,809	45,870
Loans:
Loans, net	2,960,766	2,791,779	2,818,420
FDIC receivable for loss share agreements	174,321	262,651	274,658
Premises and equipment, net	105,579	94,250	90,020
Other real estate owned (covered of $47,063, $65,849, and $79,740, respectively; non-covered of $27,484, $18,022, and $22,686, respectively)	74,547	83,871	102,426
Goodwill	66,529	62,888	62,888
Bank owned life insurance	35,785	22,111	21,974
Core deposit and other intangibles	12,862	11,538	12,061
Other assets	44,607	26,179	27,382
Total assets	4,325,232	3,896,557	3,935,518
Deposits:
Noninterest-bearing	818,633	658,454	653,924
Interest-bearing	2,770,665	2,596,018	2,633,729
Total deposits	3,589,298	3,254,472	3,287,653
Federal funds purchased and securities sold under agreements to repurchase	226,330	180,436	184,403
Other borrowings	45,807	46,683	46,955
Other liabilities	29,873	33,186	34,785
Total liabilities	3,891,308	3,514,777	3,553,796
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; 15,114,185, 14,039,422, and 14,004,372 shares issued and outstanding	37,785	35,099	35,011
Surplus	263,569	233,232	232,314
Retained earnings	132,798	116,198	113,752
Accumulated other comprehensive income (loss)	(228)	(2,749)	645
Total shareholders' equity	433,924	381,780	381,722
Total liabilities and shareholders' equity	4,325,232	3,896,557	3,935,518
Acquired loans
Loans:
Loans, gross	520,991	402,201	435,761
Loans, allowance	(31,138)	(31,620)	(29,870)
Non-acquired loans
Loans:
Loans, gross	2,517,352	2,470,565	2,461,639
Loans, allowance	$ (46,439)	$ (49,367)	$ (49,110)