Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net income	$ 808,702	$ 788,697
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	112,000	91,000
Depreciation and amortization of premises and equipment	73,916	74,516
Amortization of capitalized servicing rights	36,730	51,572
Amortization of core deposit and other intangible assets	16,848	26,654
Provision for deferred income taxes	20,141	33,777
Asset write-downs	5,775	5,114
Net gain on sales of assets	(61,969)	(3,771)
Net change in accrued interest receivable, payable	(5,484)	9,638
Net change in other accrued income and expense	11,200	(89,425)
Net change in loans originated for sale	232,974	(224,425)
Net change in trading account assets and liabilities	(2,993)	11,163
Net cash provided by operating activities	1,247,840	774,510
Cash flows from investing activities
Proceeds from sales of investment securities Available for sale	2,579	16
Proceeds from sales of investment securities Other	377	23,309
Proceeds from maturities of investment securities Available for sale	1,343,869	686,183
Proceeds from maturities of investment securities Held to maturity	519,359	337,677
Purchases of investment securities Available for sale	(3,320,931)	(5,310,246)
Purchases of investment securities Held to maturity	(22,592)	(15,202)
Purchases of investment securities Other	(8,179)	(53,264)
Net increase in loans and leases	(2,208,660)	(1,420,572)
Net (increase) decrease in interest-bearing deposits at banks	1,757,601	(6,024,926)
Capital expenditures, net	(42,744)	(50,400)
Net (increase) decrease in loan servicing advances	461,700	(340,750)
Other, net	(75,449)	38,707
Net cash used by investing activities	(1,593,070)	(12,129,468)
Cash flows from financing activities
Net increase (decrease) in deposits	(636,144)	7,225,487
Net decrease in short-term borrowings	(18,893)	(95,846)
Proceeds from long-term borrowings	1,500,000	4,345,478
Payments on long-term borrowings	(324,308)	(373,642)
Proceeds from issuance of preferred stock		346,500
Dividends paid - common	(281,149)	(278,118)
Dividends paid - preferred	(58,003)	(46,966)
Other, net	40,074	82,774
Net cash provided by financing activities	221,577	11,205,667
Net decrease in cash and cash equivalents	(123,653)	(149,291)
Cash and cash equivalents at beginning of period	1,373,357	1,672,934
Cash and cash equivalents at end of period	1,249,704	1,523,643
Supplemental disclosure of cash flow information
Interest received during the period	2,234,476	2,147,236
Interest paid during the period	234,989	185,377
Income taxes paid during the period	373,016	329,621
Supplemental schedule of noncash investing and financing activities
Securitization of residential mortgage loans allocated to Available-for-sale investment securities	51,481	110,971
Securitization of residential mortgage loans allocated to capitalized servicing rights	528	1,429
Real estate acquired in settlement of loans	$ 35,018	$ 35,422