Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income	$ 352,610	$ 348,927
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	43,000	55,000
Depreciation and amortization of premises and equipment	27,281	27,429
Amortization of capitalized servicing rights	11,656	13,543
Amortization of core deposit and other intangible assets	6,632	8,420
Provision for deferred income taxes	(124,772)	36,731
Asset write-downs	3,192	5,118
Net gain on sales of assets	(4,547)	(11,647)
Net change in accrued interest receivable, payable	(14,803)	(23,782)
Net change in other accrued income and expense	165,114	(209)
Net change in loans originated for sale	(72,403)	712,954
Net change in trading account assets and liabilities	91,219	113,332
Net cash provided by operating activities	484,179	1,285,816
Cash flows from investing activities
Proceeds from sales of investment securities Available for sale	100
Proceeds from sales of investment securities Other	254,860	100
Proceeds from maturities of investment securities Available for sale	349,294	697,756
Proceeds from maturities of investment securities Held to maturity	123,923	121,455
Purchases of investment securities Available for sale	(100)	(5,143)
Purchases of investment securities Held to maturity		(539,516)
Purchases of investment securities Other	(288,259)	(278)
Net decrease (increase) in loans and leases	303,886	797,351
Net increase in interest-bearing deposits at banks	(1,056,531)	(1,944,511)
Capital expenditures, net	(9,544)	(21,521)
Net decrease in loan servicing advances	115,163	56,437
Other, net	(41,322)	11,863
Net cash used by investing activities	(248,530)	(826,007)
Net increase (decrease) in deposits	(1,484,629)	1,550,297
Net increase in short-term borrowings	1,451,030	21,660
Proceeds from long-term borrowings	999,594
Payments on long-term borrowings	(504,192)	(1,401,410)
Purchases of treasury stock	(720,966)	(532,073)
Dividends paid - common	(112,318)	(116,566)
Dividends paid - preferred	(17,368)	(17,368)
Other, net	24,976	2,064
Net cash provided (used) by financing activities	(363,873)	(493,396)
Net decrease in cash, cash equivalents and restricted cash	(128,224)	(33,587)
Cash, cash equivalents and restricted cash at beginning of period	1,420,888	1,320,549
Cash, cash equivalents and restricted cash at end of period	1,292,664	1,286,962
Supplemental disclosure of cash flow information
Interest received during the period	1,077,676	1,001,129
Interest paid during the period	118,342	116,183
Income taxes paid during the period	37,999	29,272
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	15,410	23,607
Securitization of residential mortgage loans allocated to Available-for-sale investment securities	5,128	3,684
Securitization of residential mortgage loans allocated to capitalized servicing rights	$ 64	$ 36