Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2011
Assets
Cash and due from banks	$ 571,004	[1]	$ 590,801	[2]	$ 537,717	[1]
Overnight investments	984,536	[1]	434,975	[2]	741,654	[1]
Investment securities available for sale	4,634,248	[1]	4,056,423	[2]	4,014,241	[1]
Investment securities held to maturity	1,578	[1]	1,822	[2]	2,098	[1]
Loans held for sale	76,374	[1]	92,539	[2]	56,004	[1]
Loans and leases:
Covered under loss share agreements	1,999,351	[1]	2,362,152	[2]	2,399,738	[1]
Not covered under loss share agreements	11,462,458	[1]	11,581,637	[2]	11,528,854	[1]
Less allowance for loan and lease losses	272,929	[1]	270,144	[2]	250,050	[1]
Net loans and leases	13,188,880	[1]	13,673,645	[2]	13,678,542	[1]
Premises and equipment	873,483	[1]	854,476	[2]	842,911	[1]
Other real estate owned:
Covered under loss share agreements	117,381	[1]	148,599	[2]	150,636	[1]
Not covered under loss share agreements	49,454	[1]	50,399	[2]	49,028	[1]
Income earned not collected	49,743	[1]	42,216	[2]	50,876	[1]
Receivable from FDIC for loss share agreements	313,978	[1]	539,511	[2]	522,507	[1]
Goodwill	102,625	[1]	102,625	[2]	102,625	[1]
Other intangible assets	5,175	[1]	7,032	[2]	8,234	[1]
Other assets	272,531	[1]	286,430	[2]	264,577	[1]
Total assets	21,240,990	[1]	20,881,493	[2]	21,021,650	[1]
Liabilities
Noninterest-bearing	4,761,369	[1]	4,331,706	[2]	4,166,886	[1]
Interest-bearing	13,040,277	[1]	13,245,568	[2]	13,496,080	[1]
Total deposits	17,801,646	[1]	17,577,274	[2]	17,662,966	[1]
Short-term borrowings	700,299	[1]	615,222	[2]	655,808	[1]
Long-term obligations	644,682	[1]	687,599	[2]	792,661	[1]
Other liabilities	164,573	[1]	140,270	[2]	100,945	[1]
Total liabilities	19,311,200	[1]	19,020,365	[2]	19,212,380	[1]
Shareholders' Equity
Surplus	143,766	[1]	143,766	[2]	143,766	[1]
Retained earnings	1,838,160	[1]	1,773,652	[2]	1,684,558	[1]
Accumulated other comprehensive loss	(62,407)	[1]	(66,574)	[2]	(29,451)	[1]
Total shareholders' equity	1,929,790	[1]	1,861,128	[2]	1,809,270	[1]
Total liabilities and shareholders' equity	21,240,990	[1]	20,881,493	[2]	21,021,650	[1]
Class A Common Stock
Shareholders' Equity
Common stock	8,644	[1]	8,644	[2]	8,757	[1]
Class B Common Stock
Shareholders' Equity
Common stock	$ 1,627	[1]	$ 1,640	[2]	$ 1,640	[1]

[1] Unaudited

[2] Derived from 2011 Annual Report on Form 10-K.