Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Interest Income
Interest and fees on loans	$ 309,240	$ 324,118	$ 354,518
Interest on securities:
Taxable	75,843	77,078	80,715
Tax exempt	5,545	5,577	5,349
Interest on federal funds sold and securities purchased under reverse repurchase agreements	30	36	66
Other interest income	1,321	1,409	1,414
Total Interest Income	391,979	408,218	442,062
Interest Expense
Interest on deposits	36,294	48,657	78,886
Interest on federal funds purchased and securities sold under repurchase agreements	965	1,183	1,133
Other interest expense	5,777	6,355	7,834
Total Interest Expense	43,036	56,195	87,853
Net Interest Income	348,943	352,023	354,209
Provision for loan losses, excluding covered loans	29,704	49,546	77,112
Provision for covered loan losses	624	0	0
Net Interest Income After Provision for Loan Losses	318,615	302,477	277,097
Noninterest Income
Service charges on deposit accounts	51,707	55,183	54,087
Bank card and other fees	27,474	25,014	23,041
Insurance commissions	26,966	27,691	29,079
Mortgage banking, net	26,812	29,345	28,873
Wealth management	22,962	21,872	22,079
Other, net	3,853	4,493	5,616
Securities gains, net	80	2,329	5,467
Total Noninterest Income	159,854	165,927	168,242
Noninterest Expense
Salaries and employee benefits	178,556	174,582	169,252
Services and fees	43,858	41,949	40,292
Net occupancy - premises	20,254	19,808	20,051
Equipment expense	20,177	17,135	16,462
ORE/Foreclosure expense	16,293	24,377	12,814
FDIC assessment expense	7,984	12,161	15,808
Other expense	42,728	35,637	33,580
Total Noninterest Expense	329,850	325,649	308,259
Income Before Income Taxes	148,619	142,755	137,080
Income taxes	41,778	42,119	44,033
Net Income	106,841	100,636	93,047
Preferred stock dividends	0	0	10,124
Accretion of discount on preferred stock	0	0	9,874
Net Income Available to Common Shareholders	$ 106,841	$ 100,636	$ 73,049
Earnings Per Common Share
Basic (in dollars per share)	$ 1.67	$ 1.58	$ 1.26
Diluted (in dollars per share)	$ 1.66	$ 1.57	$ 1.26