Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net income	$ 845,770	$ 729,980
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	78,000	107,000
Depreciation and amortization of premises and equipment	54,092	54,901
Amortization of capitalized servicing rights	24,207	27,984
Amortization of core deposit and other intangible assets	13,020	16,533
Provision for deferred income taxes	(123,980)	17,136
Asset write-downs	5,237	8,797
Net gain on sales of assets	(8,738)	(21,272)
Net change in accrued interest receivable, payable	5,759	(6,350)
Net change in other accrued income and expense	255,124	50,660
Net change in loans originated for sale	(756,003)	545,864
Net change in trading account assets and liabilities	128,754	92,054
Net cash provided by operating activities	521,242	1,623,287
Cash flows from investing activities
Proceeds from sales of investment securities Available for sale	418	512,129
Proceeds from sales of investment securities equity and other	505,841	31,016
Proceeds from maturities of investment securities Available for sale	950,071	1,151,982
Proceeds from maturities of investment securities Held to maturity	247,385	245,105
Purchases of investment securities Available for sale	(5,799)	(244,449)
Purchases of investment securities Held to maturity		(1,175,608)
Purchases of investment securities equity and other	(520,040)	(68,825)
Net decrease (increase) in loans and leases	859,071	1,134,470
Net increase in interest-bearing deposits at banks	(1,591,082)	(23,191)
Capital expenditures, net	(37,116)	(49,862)
Net decrease in loan servicing advances	262,947	104,289
Other, net	(8,708)	47,742
Net cash provided by investing activities	662,988	1,664,798
Net decrease in deposits	(3,157,898)	(1,949,877)
Net increase in short-term borrowings	3,064,317	1,532,011
Proceeds from long-term borrowings	999,594	898,200
Payments on long-term borrowings	(706,370)	(2,728,059)
Purchases of treasury stock	(1,196,062)	(756,967)
Dividends paid - common	(227,565)	(230,652)
Dividends paid - preferred	(36,260)	(36,474)
Other, net	24,220	8,662
Net cash used by financing activities	(1,236,024)	(3,263,156)
Net increase (decrease) in cash, cash equivalents and restricted cash	(51,794)	24,929
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	1,369,094	1,345,478
Supplemental disclosure of cash flow information
Interest received during the period	2,210,063	2,038,009
Interest paid during the period	218,731	199,621
Income taxes paid during the period	175,619	321,106
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	36,418	57,202
Securitization of residential mortgage loans allocated to Available-for-sale investment securities	10,303	10,025
Securitization of residential mortgage loans allocated to capitalized servicing rights	$ 150	$ 106