Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income	$ 1,371,861	$ 1,085,903
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	94,000	137,000
Depreciation and amortization of premises and equipment	80,186	84,631
Amortization of capitalized servicing rights	36,567	41,475
Amortization of core deposit and other intangible assets	19,163	24,341
Provision for deferred income taxes	(73,410)	9,926
Asset write-downs	7,398	10,878
Net gain on sales of assets	(17,681)	(27,967)
Net change in accrued interest receivable, payable	(30,178)	(23,059)
Net change in other accrued income and expense	125,478	110,138
Net change in loans originated for sale	(252,981)	523,895
Net change in trading account assets and liabilities	179,214	88,705
Net cash provided by operating activities	1,539,617	2,065,866
Cash flows from investing activities
Proceeds from sales of investment securities Available for sale	418	512,143
Proceeds from sales of investment securities equity and other	649,204	178,244
Proceeds from maturities of investment securities Available for sale	1,415,214	1,650,258
Proceeds from maturities of investment securities Held to maturity	374,718	390,278
Purchases of investment securities Available for sale	(9,197)	(248,705)
Purchases of investment securities Held to maturity	(444,703)	(1,175,608)
Purchases of investment securities equity and other	(644,404)	(132,104)
Net decrease (increase) in loans and leases	1,443,623	2,259,049
Net increase in interest-bearing deposits at banks	(1,444,843)	(1,305,846)
Capital expenditures, net	(59,302)	(62,515)
Net decrease in loan servicing advances	267,074	47,786
Other, net	(11,072)	66,357
Net cash provided by investing activities	1,536,730	2,179,337
Net decrease in deposits	(3,289,371)	(1,976,237)
Net increase in short-term borrowings	1,135,011	37,326
Proceeds from long-term borrowings	1,773,189	2,145,950
Payments on long-term borrowings	(707,594)	(3,029,320)
Purchases of treasury stock	(1,694,562)	(981,691)
Dividends paid - common	(371,380)	(345,166)
Dividends paid - preferred	(53,628)	(53,842)
Other, net	22,711	5,480
Net cash used by financing activities	(3,185,624)	(4,197,500)
Net increase (decrease) in cash, cash equivalents and restricted cash	(109,277)	47,703
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	1,311,611	1,368,252
Supplemental disclosure of cash flow information
Interest received during the period	3,360,710	3,088,042
Interest paid during the period	381,137	310,640
Income taxes paid during the period	197,247	462,163
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	50,849	88,551
Securitization of residential mortgage loans allocated to Available-for-sale investment securities	17,606	22,527
Securitization of residential mortgage loans allocated to capitalized servicing rights	$ 275	$ 262