Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income for the period	$ 91,464	$ 72,610	$ 180,867	$ 125,201
Adjustments to reconcile net income to net cash provided by operating activities:
Net impairment losses on investment securities	7,308	5,158	17,517	8,263
Provision for credit losses	15,721	(574)	27,681	49,886
Depreciation and amortization	62,166	105,790	119,309	195,596
Deferred income tax expense (benefit)	(630)	33,913	19,055	87,703
Net increase (decrease) in trading securities	(1,506)	5,397	19,734	(2,485)
Net decrease in loans held for sale	50,464	41,041	71,377	69,512
Net write-down of and losses from sales of other real estate owned	5,509	14,363	13,341	34,113
Change in other liabilities	(11,731)	29,928	(30,530)	(6,896)
Change in other assets	38,398	41,334	88,823	59,488
Other, net	3,544	(2,734)	(18,372)	(4,934)
Net cash provided by operating activities	260,707	346,226	508,802	615,447
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in short term investments	(288,671)	(291,604)	(847,650)	(341,811)
Proceeds from maturities and paydowns of investment securities held-to-maturity	34,106	12,923	54,685	42,031
Purchases of investment securities held-to-maturity	(24,461)	(21,316)	(33,738)	(26,809)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	235,192	277,419	676,174	579,669
Purchases of investment securities available-for-sale	(187,627)	(238,577)	(593,930)	(518,463)
Proceeds from sales of loans and leases	13,478	16,182	39,787	17,264
Net loan and lease collections (originations)	(397,181)	(492,134)	18,230	(536,945)
Net decrease in other noninterest-bearing investments	6,445	5,522	12,174	10,318
Net purchases of premises and equipment	(17,655)	(19,295)	(32,817)	(39,480)
Proceeds from sales of other real estate owned	58,485	95,036	97,884	186,877
Net cash paid for sale of branch	0	0	(22,568)	0
Net cash provided by (used in) investing activities	(567,889)	(655,844)	(631,769)	(627,349)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	61,160	598,817	313,997	256,275
Net change in short-term funds borrowed	318,039	(190,675)	149,208	(110,583)
Proceeds from issuance of long-term debt	266,636	30,250	599,386	30,250
Repayments of long-term debt	(255,038)	(175)	(255,179)	(331)
Cash paid for preferred stock redemption	(142,500)	0	(842,500)	0
Proceeds from issuance of common stock and preferred stock	141,661	195	142,003	25,407
Dividends paid on common and preferred stock	(35,522)	(40,303)	(76,318)	(74,904)
Other, net	(4,767)	(2,603)	(7,307)	(3,310)
Net cash provided by (used in) financing activities	349,669	395,506	23,290	122,804
Net increase (decrease) in cash and due from banks	42,487	85,888	(99,677)	110,902
Cash and due from banks at beginning of period	1,082,186	949,140	1,224,350	924,126
Cash and due from banks at end of period	1,124,673	1,035,028	1,124,673	1,035,028
Cash paid for interest	44,539	51,039	107,328	142,320
Net cash refund received for income taxes	$ 9,771	$ 536	$ (11,897)	$ 428