Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities
Net income	$ 984,543	$ 808,702
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	128,000	112,000
Depreciation and amortization of premises and equipment	79,911	73,916
Amortization of capitalized servicing rights	37,979	36,730
Amortization of core deposit and other intangible assets	33,524	16,848
Provision for deferred income taxes	109,274	20,141
Asset write-downs	14,276	5,775
Net gain on sales of assets	(46,732)	(61,969)
Net change in accrued interest receivable, payable	(13,833)	(5,484)
Net change in other accrued income and expense	113,809	11,200
Net change in loans originated for sale	(285,824)	232,974
Net change in trading account assets and liabilities	(82,837)	(2,993)
Net cash provided by operating activities	1,072,090	1,247,840
Cash flows from investing activities
Proceeds from sales of investment securities Available for sale	61,947	2,579
Proceeds from sales of investment securities Other	94,516	377
Proceeds from maturities of investment securities Available for sale	1,690,665	1,343,869
Proceeds from maturities of investment securities Held to maturity	459,399	519,359
Purchases of investment securities Available for sale	(1,150,523)	(3,320,931)
Purchases of investment securities Held to maturity	(15,806)	(22,592)
Purchases of investment securities Other	(1,514)	(8,179)
Net increase in loans and leases	(2,021,004)	(2,208,660)
Net (increase) decrease in interest-bearing deposits at banks	(3,183,286)	1,757,601
Capital expenditures, net	(65,277)	(42,744)
Net decrease in loan servicing advances	121,226	461,700
Other, net	11,459	(75,449)
Net cash used by investing activities	(3,998,198)	(1,593,070)
Cash flows from financing activities
Net increase (decrease) in deposits	6,195,511	(636,144)
Net decrease in short-term borrowings	(1,886,701)	(18,893)
Proceeds from long-term borrowings		1,500,000
Payments on long-term borrowings	(427,035)	(324,308)
Purchases of treasury stock	(604,000)
Dividends paid - common	(333,042)	(281,149)
Dividends paid - preferred	(58,003)	(58,003)
Other, net	3,540	40,074
Net cash provided by financing activities	2,890,270	221,577
Net decrease in cash and cash equivalents	(35,838)	(123,653)
Cash and cash equivalents at beginning of period	1,368,040	1,373,357
Cash and cash equivalents at end of period	1,332,202	1,249,704
Supplemental disclosure of cash flow information
Interest received during the period	2,923,278	2,234,476
Interest paid during the period	387,695	234,989
Income taxes paid during the period	138,375	373,016
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	100,106	35,018
Securitization of residential mortgage loans allocated to Available-for-sale investment securities	18,685	51,481
Securitization of residential mortgage loans allocated to capitalized servicing rights	$ 193	$ 528