Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities
Net income	$ 1,400,778	$ 882,012
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	(60,000)	725,000
Depreciation and amortization of premises and equipment	169,232	164,323
Amortization of capitalized servicing rights	66,000	63,992
Amortization of core deposit and other intangible assets	8,213	11,740
Provision for deferred income taxes	70,190	(119,913)
Asset write-downs	5,046	17,692
Net gain on sales of assets	(15,260)	(14,736)
Net change in accrued interest receivable, payable	20,395	(135,825)
Net change in other accrued income and expense	50,804	(344,085)
Net change in loans originated for sale	(117,139)	(422,773)
Net change in trading account assets and liabilities	419,772	(702,362)
Net cash provided by operating activities	2,018,031	125,065
Cash flows from investing activities
Proceeds from sales of investment securities equity and other	8,937	55,499
Proceeds from maturities of investment securities Available for sale	1,139,203	1,149,281
Proceeds from maturities of investment securities Held to maturity	476,352	719,379
Purchases of investment securities Available for sale	(5,389)	(5,860)
Purchases of investment securities Held to maturity	(1,087,656)	(8,995)
Purchases of investment securities equity and other	(27,270)	(26,955)
Net (increase) decrease in loans and leases	4,977,272	(7,227,304)
Net increase in interest-bearing deposits at banks	(14,781,978)	(13,007,783)
Capital expenditures, net	(87,165)	(125,370)
Net (increase) decrease in loan servicing advances	(402,175)	149,838
Other, net	(388,305)	351,278
Net cash used by investing activities	(10,178,174)	(17,976,992)
Cash flows from financing activities
Net increase in deposits	8,895,558	20,394,732
Net increase (decrease) in short-term borrowings	44,066	(16,240)
Proceeds from long-term borrowings	9,500
Payments on long-term borrowings	(853,041)	(1,605,041)
Purchases of treasury stock		(373,750)
Dividends paid — common	(425,541)	(426,204)
Dividends paid — preferred	(55,388)	(55,444)
Proceeds from issuance of Series I preferred stock	495,000
Other, net	(23,042)	(13,199)
Net cash provided by financing activities	8,087,112	17,904,854
Net increase (decrease) in cash, cash equivalents and restricted cash	(73,031)	52,927
Cash, cash equivalents and restricted cash at beginning of period	1,552,743	1,436,305
Cash, cash equivalents and restricted cash at end of period	1,479,712	1,489,232
Supplemental disclosure of cash flow information
Interest received during the period	2,976,574	3,121,917
Interest paid during the period	116,402	319,079
Income taxes paid during the period	278,783	254,471
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	6,822	20,047
Loans held for sale transferred to loans held for investment	330,188
Additions to right-of-use assets under operating leases	$ 34,404	$ 45,888