Consolidated Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net income	$ 1,858,746	$ 1,353,152	$ 1,929,149
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	(75,000)	800,000	176,000
Depreciation and amortization of premises and equipment	224,274	220,598	209,937
Amortization of capitalized servicing rights	89,767	84,821	71,888
Amortization of core deposit and other intangible assets	10,167	14,869	19,490
Provision for deferred income taxes	87,159	(31,291)	57,548
Asset write-downs	8,431	21,014	7,701
Net gain (loss) on sales of assets	(10,308)	(19,441)	31,526
Net change in accrued interest receivable, payable	65,724	(132,252)	30,923
Net change in other accrued income and expense	52,540	(418,752)	75,930
Net change in loans originated for sale	(163,623)	(542,078)	130,230
Net change in trading account assets and liabilities	567,082	(561,453)	(382,767)
Net cash provided by operating activities	2,714,959	789,187	2,357,555
Cash flows from investing activities
Proceeds from sales of investment securities Available for sale			107
Proceeds from sales of investment securities equity and other	17,654	67,036	1,169,876
Proceeds from maturities of investment securities Available for sale	1,433,793	1,614,557	2,621,603
Proceeds from maturities of investment securities Held to maturity	615,201	911,555	1,162,820
Purchases of investment securities Available for sale	(677,916)	(7,581)	(28,120)
Purchases of investment securities Held to maturity	(1,601,698)	(11,993)	(495,277)
Purchases of investment securities equity and other	(30,153)	(29,004)	(979,734)
Net (increase) decrease in loans and leases	5,676,670	(7,231,694)	(2,795,263)
Net (increase) decrease in interest-bearing deposits at banks	(18,208,494)	(16,473,656)	915,043
Capital expenditures, net	(149,213)	(172,289)	(178,049)
Net increase in loan servicing advances	(197,141)	(754,823)	(470,078)
Other, net	(510,302)	67,411	(195,921)
Net cash provided (used) by investing activities	(13,631,599)	(22,020,481)	727,007
Cash flows from financing activities
Net increase in deposits	11,737,671	25,037,167	4,616,082
Net decrease in short-term borrowings	(12,436)	(2,881)	(4,336,015)
Proceeds from long-term borrowings	9,500
Payments on long-term borrowings	(853,091)	(2,665,023)	(1,553,493)
Purchases of treasury stock		(373,750)	(1,349,785)
Dividends paid — common	(580,260)	(568,112)	(552,138)
Dividends paid — preferred	(68,200)	(68,256)	(67,454)
Proceeds from issuance of Series I and G preferred stock	495,000		396,000
Redemption of Series A and C preferred stock			(381,500)
Other, net	(26,710)	(11,413)	(25,393)
Net cash provided (used) by financing activities	10,701,474	21,347,732	(3,253,696)
Net increase (decrease) in cash, cash equivalents and restricted cash	(215,166)	116,438	(169,134)
Cash, cash equivalents and restricted cash at beginning of period	1,552,743	1,436,305	1,605,439
Cash, cash equivalents and restricted cash at end of period	1,337,577	1,552,743	1,436,305
Supplemental disclosure of cash flow information
Interest received during the period	3,976,804	4,135,990	4,892,301
Interest paid during the period	139,164	372,291	735,787
Income taxes paid during the period	314,295	275,558	320,513
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	8,851	20,646	90,072
Loans held for sale transferred to loans held for investment	330,188
Securitization of residential mortgage loans allocated to Available-for-sale investment securities			5,379
Securitization of residential mortgage loans allocated to capitalized servicing rights			83
Adoption of lease accounting standard - Right-of-use assets			393,877
Adoption of lease accounting standard - Other liabilities			398,810
Additions to right-of-use assets under operating leases	$ 57,760	$ 70,754	$ 132,219