Consolidated Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities
Net income	$ 622,579	$ 439,843
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	95,000	109,000
Depreciation and amortization of premises and equipment	43,354	41,762
Amortization of capitalized servicing rights	30,653	28,773
Amortization of core deposit and other intangible assets	25,845	32,681
Provision for deferred income taxes	30,373	12,064
Asset write-downs	15,043	39,676
Net gain on sales of assets	(59,134)	(3,786)
Net change in accrued interest receivable, payable	(1,131)	1,731
Net change in other accrued income and expense	20,336	(35,590)
Net change in loans originated for sale	(220,784)	(33,964)
Net change in trading account assets and liabilities	14,362	12,438
Net cash provided by operating activities	616,496	644,628
Cash flows from investing activities
Proceeds from sales of investment securities Available for sale	1,081,496	48,873
Proceeds from sales of investment securities Other	5,439	45,374
Proceeds from maturities of investment securities Available for sale	652,074	741,571
Proceeds from maturities of investment securities Held to maturity	141,255	157,849
Purchases of investment securities Available for sale	(39,411)	(19,808)
Purchases of investment securities Held to maturity	(11,252)	(269,854)
Purchases of investment securities Other	(8,540)	(13,269)
Net increase in loans and leases	(228,853)	(2,805,640)
Net increase in interest-bearing deposits at banks	(2,425,409)	(914,757)
Other investments, net	(3,936)	(5,436)
Capital expenditures, net	(43,663)	(46,892)
Proceeds from sales of real estate acquired in settlement of loans	35,456	64,735
Other, net	53,842	(38,849)
Net cash used by investing activities	(791,502)	(3,056,103)
Cash flows from financing activities
Net increase in deposits	54,101	3,162,352
Net increase (decrease) in short-term borrowings	(766,742)	193,515
Proceeds from long-term borrowings	799,760
Payments on long-term borrowings	(257,178)	(1,006,539)
Dividends paid - common	(181,842)	(179,446)
Dividends paid - preferred	(26,725)	(26,725)
Other, net	41,519	238,752
Net cash provided (used) by financing activities	(337,107)	2,381,909
Net decrease in cash and cash equivalents	(512,113)	(29,566)
Cash and cash equivalents at beginning of period	1,986,615	1,452,397
Cash and cash equivalents at end of period	1,474,502	1,422,831
Supplemental disclosure of cash flow information
Interest received during the period	1,459,142	1,457,310
Interest paid during the period	151,737	192,666
Income taxes paid during the period	226,406	204,249
Supplemental schedule of noncash investing and financing activities
Held to maturity investment securities	917,045
Capitalized servicing rights	8,907
Real estate acquired in settlement of loans	$ 15,502	$ 26,623