Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Assets:
Cash and due from banks	$ 575,464	$ 587,847	$ 491,747
Interest-bearing deposits	2,836,046	2,171,828	2,145,003
Federal funds sold and resell agreements	9,051	61,302	12,063
Total cash and cash equivalents	3,420,561	2,820,977	2,648,813
Securities held to maturity, at amortized cost	349,997	283,629	252,995
Securities available for sale, at estimated fair value	5,432,354	5,157,470	4,753,608
Trading account securities	14,517	15,101	15,833
Loans, net of unearned discounts	8,068,212	8,117,020	8,065,679
Less: Allowance for loan losses	(122,741)	(126,316)	(125,442)
Net loans	7,945,471	7,990,704	7,940,237
Premises and equipment, net	316,165	316,909	318,921
Goodwill	528,072	527,684	527,684
Other intangible assets, net	12,764	14,335	16,828
Cash surrender value of life insurance policies	131,883	129,922	127,579
Accrued interest receivable and other assets	326,602	360,361	457,381
Total assets	18,478,386	17,617,092	17,059,879
Liabilities:
Non-interest-bearing demand deposits	5,818,692	5,360,436	5,062,023
Interest-bearing deposits	9,285,439	9,118,906	8,890,137
Total deposits	15,104,131	14,479,342	13,952,160
Federal funds purchased and repurchase agreements	574,132	475,673	438,496
Junior subordinated deferrable interest debentures	123,712	123,712	136,084
Other long-term borrowings	250,036	250,045	250,054
Accrued interest payable and other liabilities	249,730	226,640	242,234
Total liabilities	16,301,741	15,555,412	15,019,028
Shareholders' Equity:
Preferred stock, par value $0.01 per share; 10,000,000 shares authorized; none issued
Junior participating preferred stock, par value $0.01 per share; 250,000 shares authorized; none issued
Common stock, par value $0.01 per share; 210,000,000 shares authorized; 61,271,603 shares issued at June 30,2011, 61,108,184 shares issued at December 31, 2010 and 60,656,360 shares issued at June 30, 2010	613	611	606
Additional paid-in capital	673,620	657,335	628,227
Retained earnings	1,301,279	1,249,484	1,196,254
Accumulated other comprehensive income, net of tax	202,589	154,250	215,764
Treasury stock, 26,359 shares at June 30, 2011, at cost	(1,456)
Total shareholders' equity	2,176,645	2,061,680	2,040,851
Total liabilities and shareholders' equity	$ 18,478,386	$ 17,617,092	$ 17,059,879