Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011		Dec. 31, 2010		Sep. 30, 2010
Assets
Cash and due from banks	$ 539,337	[1]	$ 460,178	[2]	$ 493,786	[1]
Overnight investments	410,002	[1]	398,390	[2]	1,049,158	[1]
Investment securities available for sale	3,994,825	[1]	4,510,076	[2]	3,786,841	[1]
Investment securities held to maturity	1,943	[1]	2,532	[2]	2,645	[1]
Loans held for sale	78,178	[1]	88,933	[2]	79,853	[1]
Loans and leases:
Covered under loss share agreements	2,557,450	[1]	2,007,452	[2]	2,222,660	[1]
Not covered under loss share agreements	11,603,526	[1]	11,480,577	[2]	11,545,309	[1]
Less allowance for loan and lease losses	254,184	[1]	227,765	[2]	218,046	[1]
Net loans and leases	13,906,792	[1]	13,260,264	[2]	13,549,923	[1]
Premises and equipment	847,372	[1]	842,745	[2]	845,478	[1]
Other real estate owned:
Covered under loss share agreements	160,443	[1]	112,748	[2]	99,843	[1]
Not covered under loss share agreements	48,616	[1]	52,842	[2]	47,523	[1]
Income earned not collected	43,886	[1]	83,644	[2]	83,204	[1]
Receivable from FDIC for loss share agreements	607,907	[1]	623,261	[2]	651,844	[1]
Goodwill	102,625	[1]	102,625	[2]	102,625	[1]
Other intangible assets	8,081	[1]	9,897	[2]	11,373	[1]
Other assets	265,337	[1]	258,524	[2]	245,195	[1]
Total assets	21,015,344	[1]	20,806,659	[2]	21,049,291	[1]
Deposits:
Noninterest-bearing	4,274,945	[1]	3,976,366	[2]	3,859,389	[1]
Interest-bearing	13,388,330	[1]	13,658,900	[2]	13,883,639	[1]
Total deposits	17,663,275	[1]	17,635,266	[2]	17,743,028	[1]
Short-term borrowings	600,384	[1]	546,597	[2]	652,716	[1]
Long-term obligations	744,839	[1]	809,949	[2]	819,145	[1]
Other liabilities	134,916	[1]	81,885	[2]	116,198	[1]
Total liabilities	19,143,414	[1]	19,073,697	[2]	19,331,087	[1]
Shareholders' Equity
Surplus	143,766	[1]	143,766	[2]	143,766	[1]
Retained earnings	1,750,382	[1]	1,615,290	[2]	1,588,336	[1]
Accumulated other comprehensive loss	(32,527)	[1]	(36,529)	[2]	(24,333)	[1]
Total shareholders' equity	1,871,930	[1]	1,732,962	[2]	1,718,204	[1]
Total liabilities and shareholders' equity	21,015,344	[1]	20,806,659	[2]	21,049,291	[1]
Class A Common Stock [Member]
Shareholders' Equity
Common stock	8,669	[1]	8,757	[2]	8,757	[1]
Total shareholders' equity	8,669		8,757		8,757
Class B Common Stock [Member]
Shareholders' Equity
Common stock	1,640	[1]	1,678	[2]	1,678	[1]
Total shareholders' equity	$ 1,640		$ 1,678		$ 1,678

[1] Unaudited

[2] Derived from 2010 Annual Report on Form 10-K.