Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net income	$ 729,980	$ 634,559
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	107,000	81,000
Depreciation and amortization of premises and equipment	54,901	53,514
Amortization of capitalized servicing rights	27,984	24,648
Amortization of core deposit and other intangible assets	16,533	23,737
Provision for deferred income taxes	17,136	94,458
Asset write-downs	8,797	7,737
Net gain on sales of assets	(21,272)	(10,477)
Net change in accrued interest receivable, payable	(6,350)	2,358
Net change in other accrued income and expense	50,660	(32,180)
Net change in loans originated for sale	545,864	(188,771)
Net change in trading account assets and liabilities	92,054	(40,552)
Net cash provided by operating activities	1,623,287	650,031
Cash flows from investing activities
Proceeds from sales of investment securities Available for sale	512,129	4,970
Proceeds from sales of investment securities Other	31,016	85,389
Proceeds from maturities of investment securities Available for sale	1,151,982	1,067,100
Proceeds from maturities of investment securities Held to maturity	245,105	291,917
Purchases of investment securities Available for sale	(244,449)	(518,203)
Purchases of investment securities Held to maturity	(1,175,608)	(10,456)
Purchases of investment securities Other	(68,825)	(1,019)
Net decrease (increase) in loans and leases	1,134,470	(930,426)
Net increase in interest-bearing deposits at banks	(23,191)	(880,489)
Capital expenditures, net	(49,862)	(36,619)
Net decrease in loan servicing advances	104,289	119,190
Other, net	47,742	(98,452)
Net cash provided (used) by investing activities	1,664,798	(907,098)
Cash flows from financing activities
Net increase (decrease) in deposits	(1,949,877)	2,705,332
Net increase (decrease) in short-term borrowings	1,532,011	(1,693,603)
Proceeds from long-term borrowings	898,200
Payments on long-term borrowings	(2,728,059)	(322,591)
Purchases of treasury stock	(756,967)	(254,000)
Dividends paid — common	(230,652)	(223,179)
Dividends paid — preferred	(36,474)	(40,635)
Other, net	8,662	2,145
Net cash provided (used) by financing activities	(3,263,156)	173,469
Net increase (decrease) in cash and cash equivalents	24,929	(83,598)
Cash and cash equivalents at beginning of period	1,320,549	1,368,040
Cash and cash equivalents at end of period	1,345,478	1,284,442
Supplemental disclosure of cash flow information
Interest received during the period	2,038,009	1,947,027
Interest paid during the period	199,621	257,222
Income taxes paid during the period	321,106	105,361
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	57,202	66,286
Securitization of residential mortgage loans allocated to Available-for-sale investment securities	10,025	13,923
Securitization of residential mortgage loans allocated to capitalized servicing rights	$ 106	$ 143