Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income for the period	$ 83,026	$ 91,464	$ 193,413	$ 180,867
Adjustments to reconcile net income to net cash provided by operating activities:
Debt extinguishment cost	40,282	0	40,282	0
Net impairment losses on investment securities	4,217	7,308	14,334	17,517
Provision for credit losses	(18,363)	15,721	(53,752)	27,681
Depreciation and amortization	45,526	62,166	91,759	119,309
Deferred income tax expense (benefit)	(7,726)	(630)	(6,444)	19,055
Net decrease (increase) in trading securities	1,882	(1,506)	1,871	19,734
Net decrease in loans held for sale	33,450	50,464	123,446	71,377
Net write-downs of and gains/losses from sales of other real estate owned	439	5,509	492	13,341
Change in other liabilities	2,967	(11,731)	(45,510)	(30,530)
Change in other assets	121,095	38,398	172,675	88,823
Other, net	4,299	3,544	(11,206)	(18,372)
Net cash provided by operating activities	311,094	260,707	521,360	508,802
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease (increase) in money market investments	(276,364)	(288,671)	352,523	(847,650)
Proceeds from maturities and paydowns of investment securities held-to-maturity	27,825	34,106	81,437	54,685
Purchases of investment securities held-to-maturity	(74,168)	(24,461)	(119,968)	(33,738)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	259,273	235,192	618,496	676,174
Purchases of investment securities available-for-sale	(124,146)	(187,627)	(611,121)	(593,930)
Proceeds from sales of loans and leases	5,046	13,478	11,057	39,787
Net loan and lease collections (originations)	(497,110)	(397,181)	(631,947)	18,230
Net decrese in other noninterest-bearing investments	(12,646)	(6,445)	(20,034)	(12,174)
Net purchases of premises and equipment	(26,733)	(17,655)	(42,533)	(32,817)
Proceeds from sales of other real estate owned	24,685	58,485	52,659	97,884
Net cash paid for divestitutes	0	0	0	(22,568)
Net cash used in investing activities	(669,046)	(567,889)	(269,363)	(631,769)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	525,860	61,160	(1,117,018)	313,997
Net change in short-term funds borrowed	(70,154)	318,039	(96,007)	149,208
Proceeds from issuance of long-term debt	348,585	266,636	367,947	599,386
Repayments of long-term debt	(551,616)	(255,038)	(570,014)	(255,179)
Debt extinguishment cost paid	(23,305)	0	(23,305)	0
Cash paid for preferred stock redemption	0	(142,500)	0	(842,500)
Proceeds from issuances of common and preferred stock	423,118	141,661	592,517	142,003
Dividends paid on common and preferred stock	(35,047)	(35,522)	(59,279)	(76,318)
Other, net	(5,209)	(4,767)	(5,648)	(7,307)
Net cash provided by (used in) financing activities	612,232	349,669	(910,807)	23,290
Net increase (decrease) in cash and due from banks	254,280	42,487	(658,810)	(99,677)
Cash and due from banks at beginning of period	928,817	1,082,186	1,841,907	1,224,350
Cash and due from banks at end of period	1,183,097	1,124,673	1,183,097	1,124,673
Cash paid for interest	41,782	44,539	103,913	107,328
Net cash paid for income taxes	$ 120,438	$ 81,352	$ 124,003	$ 59,684