Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest Income
Interest and Fees on Loans and Leases	$ 63,918	$ 64,668	$ 189,467	$ 193,269
Income on Investment Securities
Available-for-Sale	12,038	15,922	42,962	50,623
Held-to-Maturity	24,137	23,232	63,180	74,699
Deposits	3	3	7	6
Funds Sold	177	105	310	353
Other	301	283	870	844
Total Interest Income	100,574	104,213	296,796	319,794
Interest Expense
Deposits	2,500	2,931	7,725	9,623
Securities Sold Under Agreements to Repurchase	6,551	7,185	20,307	21,739
Funds Purchased	4	7	36	17
Long-Term Debt	632	458	1,941	1,454
Total Interest Expense	9,687	10,581	30,009	32,833
Net Interest Income	90,887	93,632	266,787	286,961
Provision for Credit Losses	0	0	0	979
Net Interest Income After Provision for Credit Losses	90,887	93,632	266,787	285,982
Noninterest Income
Trust and Asset Management	11,717	11,050	35,692	33,163
Mortgage Banking	4,132	11,745	16,363	24,376
Service Charges on Deposit Accounts	9,385	9,346	27,798	28,162
Fees, Exchange, and Other Service Charges	12,732	11,907	37,799	36,632
Investment Securities Gains (Losses), Net	0	13	0	(77)
Insurance	2,177	2,326	6,895	7,003
Bank-Owned Life Insurance	1,365	2,028	3,997	5,248
Other	3,618	3,959	12,401	12,797
Total Noninterest Income	45,126	52,374	140,945	147,304
Noninterest Expense
Salaries and Benefits	46,552	47,231	140,568	138,292
Net Occupancy	9,847	10,524	29,143	31,098
Net Equipment	4,572	4,523	13,529	15,018
Data Processing	3,697	3,397	10,013	10,144
Professional Fees	2,119	2,494	6,736	7,012
FDIC Insurance	1,913	1,822	5,811	5,981
Other	14,277	14,887	42,745	43,287
Total Noninterest Expense	82,977	84,878	248,545	250,832
Income Before Provision for Income Taxes	53,036	61,128	159,187	182,454
Provision for Income Taxes	15,332	19,896	47,740	56,665
Net Income	$ 37,704	$ 41,232	$ 111,447	$ 125,789
Basic Earnings Per Share (in dollars per share)	$ 0.85	$ 0.92	$ 2.51	$ 2.78
Diluted Earnings Per Share (in dollars per share)	$ 0.85	$ 0.92	$ 2.50	$ 2.77
Dividends Declared Per Share (in dollars per share)	$ 0.45	$ 0.45	$ 1.35	$ 1.35
Basic Weighted Average Shares (in shares)	44,267,356	44,913,348	44,433,967	45,280,541
Diluted Weighted Average Shares (in shares)	44,479,472	45,050,638	44,588,777	45,421,624