Consolidated Statements Of Income (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Interest income:
Loans, including fees	$ 99,737	$ 102,874	$ 298,036	$ 307,898
Securities:
Taxable	30,089	30,968	92,942	91,525
Tax-exempt	23,127	20,380	69,029	60,399
Interest-bearing deposits	1,811	1,438	4,454	3,282
Federal funds sold and resell agreements	15	28	44	59
Total interest income	154,779	155,688	464,505	463,163
Interest expense:
Deposits	5,306	7,334	17,203	23,272
Federal funds purchased and repurchase agreements	63	116	277	290
Junior subordinated deferrable interest debentures	1,710	1,741	5,073	5,297
Other long-term borrowings	2,339	4,081	10,499	12,408
Total interest expense	9,418	13,272	33,052	41,267
Net interest income	145,361	142,416	431,453	421,896
Provision for loan losses	9,010	10,100	27,445	32,321
Net interest income after provision for loan losses	136,351	132,316	404,008	389,575
Non-interest income:
Trust fees	18,405	17,029	55,601	51,029
Service charges on deposit accounts	24,306	24,980	71,293	74,714
Insurance commissions and fees	9,569	8,588	27,971	27,238
Other charges, commissions and fees	8,134	7,708	25,371	22,656
Net gain (loss) on securities transactions	6,409		6,414	6
Other	12,394	12,125	35,692	36,112
Total non-interest income	79,217	70,430	222,342	211,755
Non-interest expense:
Salaries and wages	61,697	59,743	185,902	178,845
Employee benefits	12,004	12,698	40,365	39,894
Net occupancy	12,080	12,197	35,555	34,969
Furniture and equipment	13,106	12,165	38,015	35,316
Deposit insurance	2,583	4,661	9,941	15,533
Intangible amortization	1,108	1,276	3,335	3,908
Other	34,829	29,812	101,152	93,335
Total non-interest expense	137,407	132,552	414,265	401,800
Income before income taxes	78,161	70,194	212,085	199,530
Income taxes	23,654	15,199	49,964	43,817
Net income	$ 54,507	$ 54,995	$ 162,121	$ 155,713
Earnings per common share:
Basic	$ 0.89	$ 0.90	$ 2.64	$ 2.57
Diluted	$ 0.89	$ 0.90	$ 2.64	$ 2.57