Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Interest Income
Interest and Fees on Loans and Leases	$ 262,239	$ 287,381	$ 326,921
Income on Investment Securities
Trading			594
Available-for-Sale	103,363	169,151	158,244
Held-to-Maturity	72,138	6,504	9,133
Deposits	8	28	20
Funds Sold	828	1,076	1,776
Other	1,117	1,111	1,106
Total Interest Income	439,693	465,251	497,794
Interest Expense
Deposits	18,321	29,196	54,058
Securities Sold Under Agreements to Repurchase	29,171	25,996	25,934
Funds Purchased	20	30	22
Long-Term Debt	1,973	3,549	5,446
Total Interest Expense	49,485	58,771	85,460
Net Interest Income	390,208	406,480	412,334
Provision for Credit Losses	12,690	55,287	107,878
Net Interest Income After Provision for Credit Losses	377,518	351,193	304,456
Noninterest Income
Trust and Asset Management	45,046	44,889	46,174
Mortgage Banking	14,664	18,576	22,995
Service Charges on Deposit Accounts	38,733	53,039	54,470
Fees, Exchange, and Other Service Charges	60,227	61,006	60,122
Investment Securities Gains, Net	6,366	42,848	25,770
Insurance	10,957	9,961	20,015
Other	21,662	24,939	38,262
Total Noninterest Income	197,655	255,258	267,808
Noninterest Expense
Salaries and Benefits	182,816	185,713	188,568
Net Occupancy	43,169	40,988	41,053
Net Equipment	18,849	19,371	17,713
Professional Fees	8,623	7,104	12,439
FDIC Insurance	9,346	12,564	17,342
Other	85,390	80,496	72,909
Total Noninterest Expense	348,193	346,236	350,024
Income Before Provision for Income Taxes	226,980	260,215	222,240
Provision for Income Taxes	66,937	76,273	78,207
Net Income	$ 160,043	$ 183,942	$ 144,033
Basic Earnings Per Share (in dollars per share)	$ 3.40	$ 3.83	$ 3.02
Diluted Earnings Per Share (in dollars per share)	$ 3.39	$ 3.80	$ 3.00
Dividends Declared Per Share (in dollars per share)	$ 1.80	$ 1.80	$ 1.80
Basic Weighted Average Shares (in shares)	47,064,925	48,055,025	47,702,500
Diluted Weighted Average Shares (in shares)	47,224,981	48,355,965	48,009,277