Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Interest Income
Interest and Fees on Loans and Leases	$ 62,820	$ 64,691
Income on Investment Securities
Available-for-Sale	15,851	17,713
Held-to-Maturity	19,854	26,413
Deposits	3	2
Funds Sold	59	129
Other	284	280
Total Interest Income	98,871	109,228
Interest Expense
Deposits	2,646	3,473
Securities Sold Under Agreements to Repurchase	7,005	7,304
Funds Purchased	22	5
Long-Term Debt	638	498
Total Interest Expense	10,311	11,280
Net Interest Income	88,560	97,948
Provision for Credit Losses	0	351
Net Interest Income After Provision for Credit Losses	88,560	97,597
Noninterest Income
Trust and Asset Management	11,886	10,918
Mortgage Banking	6,411	5,050
Service Charges on Deposit Accounts	9,301	9,591
Fees, Exchange, and Other Service Charges	11,934	12,399
Investment Securities Losses, Net	0	(90)
Insurance	2,325	2,278
Other	5,921	7,936
Total Noninterest Income	47,778	48,082
Noninterest Expense
Salaries and Benefits	48,675	47,024
Net Occupancy	9,635	10,516
Net Equipment	4,577	5,826
Professional Fees	2,226	2,132
FDIC Insurance	1,949	2,071
Other	17,325	17,638
Total Noninterest Expense	84,387	85,207
Income Before Provision for Income Taxes	51,951	60,472
Provision for Income Taxes	15,971	16,662
Net Income	$ 35,980	$ 43,810
Basic Earnings Per Share (in dollars per share)	$ 0.81	$ 0.96
Diluted Earnings Per Share (in dollars per share)	$ 0.81	$ 0.95
Dividends Declared Per Share (in dollars per share)	$ 0.45	$ 0.45
Basic Weighted Average Shares (in shares)	44,545,092	45,709,936
Diluted Weighted Average Shares (in shares)	44,686,632	45,875,238