Consolidated Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities
Net income	$ 917,058	$ 733,305
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	143,000	155,000
Depreciation and amortization of premises and equipment	66,547	63,344
Amortization of capitalized servicing rights	46,966	44,678
Amortization of core deposit and other intangible assets	36,473	46,766
Provision for deferred income taxes	93,229	108,699
Asset write-downs	16,204	46,505
Net gain on sales of assets	(124,375)	(5,070)
Net change in accrued interest receivable, payable	(2,819)	(10,712)
Net change in other accrued income and expense	115,400	(204,876)
Net change in loans originated for sale	(808,778)	(528,606)
Net change in trading account assets and liabilities	4,772	24,743
Net cash provided by operating activities	503,677	473,776
Cash flows from investing activities
Proceeds from sales of investment securities Available for sale	1,081,747	49,430
Proceeds from sales of investment securities Other	12,994	61,648
Proceeds from maturities of investment securities Available for sale	887,092	1,155,603
Proceeds from maturities of investment securities Held to maturity	216,627	237,933
Purchases of investment securities Available for sale	(41,358)	(26,115)
Purchases of investment securities Held to maturity	(1,586,425)	(282,704)
Purchases of investment securities Other	(8,825)	(13,563)
Net (increase) decrease in loans and leases	905,491	(3,572,339)
Net increase in interest-bearing deposits at banks	(1,795,866)	(257,034)
Other investments, net	(16,947)	(7,447)
Capital expenditures, net	(85,964)	(65,947)
Proceeds from sales of real estate acquired in settlement of loans	48,929	80,762
Other, net	(179,629)	(86,649)
Net cash used by investing activities	(562,134)	(2,726,422)
Cash flows from financing activities
Net increase in deposits	604,311	4,624,134
Net decrease in short-term borrowings	(828,463)	(189,906)
Proceeds from long-term borrowings	799,760
Payments on long-term borrowings	(258,937)	(1,727,313)
Dividends paid - common	(273,518)	(267,481)
Dividends paid - preferred	(31,494)	(31,494)
Other, net	119,936	15,237
Net cash provided by financing activities	131,595	2,423,177
Net increase in cash and cash equivalents	73,138	170,531
Cash and cash equivalents at beginning of period	1,986,615	1,452,397
Cash and cash equivalents at end of period	2,059,753	1,622,928
Supplemental disclosure of cash flow information
Interest received during the period	2,184,128	2,187,027
Interest paid during the period	226,335	280,983
Income taxes paid during the period	331,117	272,502
Supplemental schedule of noncash investing and financing activities
Available for sale investment securities	1,807,180
Securitization of residential mortgage loans allocated to Held to maturity investment securities	917,045
Capitalized servicing rights	29,264
Real estate acquired in settlement of loans	$ 35,865	$ 36,881