Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Document Fiscal Year Focus	2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income for the period	$ 101,210	$ 110,387
Adjustments to reconcile net income to net cash provided by operating activities:
Net impairment losses on investment securities	27	10,117
Provision for credit losses	(1,622)	(35,389)
Depreciation and amortization	32,404	38,258
Fixed income securities gains (losses), net	(30,914)	(3,299)
Deferred income tax expense (benefit)	78,278	1,282
Net decrease (increase) in trading securities	(21,862)	(11)
Net decrease (increase) in loans held for sale	41,195	89,996
Change in other liabilities	(77,580)	(48,477)
Change in other assets	3,086	51,580
Other, net	2,336	(12,153)
Net cash provided by operating activities	126,558	202,291
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease (increase) in money market investments	(80,488)	628,887
Proceeds from maturities and paydowns of investment securities held-to-maturity	18,935	53,612
Purchases of investment securities held-to-maturity	(35,750)	(45,800)
Proceeds from sales, maturities, and paydowns of investment securities available-for-sale	847,288	359,223
Purchases of investment securities available-for-sale	(452,123)	(486,975)
Proceeds from sales of loans and leases	6,142	6,011
Net loan and lease originations	(168,628)	(126,862)
Net purchases of premises and equipment	(76,916)	(15,800)
Proceeds from sales of other real estate owned	11,825	27,974
Payments for (Proceeds from) Other Investing Activities	5,617	7,388
Net cash provided by (used in) investing activities	75,902	407,658
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	170,206	(1,642,878)
Net change in short-term funds borrowed	(60,511)	(25,853)
Proceeds from issuance of long-term debt	0	19,362
Repayments of long-term debt	(124,755)	(18,398)
Proceeds from issuances of common and preferred stock	2,880	169,399
Dividends paid on common and preferred stock	(23,741)	(24,232)
Other, net	(303)	(439)
Net cash provided by (used in) financing activities	(36,224)	(1,523,039)
Net increase (decrease) in cash and due from banks	166,236	(913,090)
Cash and due from banks at beginning of period	1,175,083	1,841,907
Cash and due from banks at end of period	1,341,319	928,817
Cash paid for interest	40,849	62,131
Net cash paid for income taxes	$ (81)	$ 3,565