Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net income	$ 447,249	$ 268,822
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	(25,000)	250,000
Depreciation and amortization of premises and equipment	57,116	54,756
Amortization of capitalized servicing rights	19,951	18,991
Amortization of core deposit and other intangible assets	2,738	3,913
Provision for deferred income taxes	39,329	(36,243)
Asset write-downs	1,217	2,990
Net gain on sales of assets	(2,106)	(3,933)
Net change in accrued interest receivable, payable	(36,893)	(13,863)
Net change in other accrued income and expense	(27,301)	(73,363)
Net change in loans originated for sale	158,878	(158,193)
Net change in trading account assets and liabilities	359,559	(708,319)
Net cash provided (used) by operating activities	994,737	(394,442)
Cash flows from investing activities
Proceeds from sales of investment securities equity and other	2,526	2,536
Net cash used by investing activities	(8,931,747)	(3,852,363)
Proceeds from maturities of investment securities Available for sale	422,171	303,994
Proceeds from maturities of investment securities Held to maturity	171,644	359,615
Purchases of investment securities Available for sale	(1,002)	(2,951)
Purchases of investment securities Held to maturity	(201,234)	(5,996)
Purchases of investment securities equity and other	(8,801)	(17,728)
Net increase in loans and leases	(988,654)	(3,105,967)
Net increase in interest-bearing deposits at banks	(7,743,417)	(1,706,153)
Capital expenditures, net	(31,016)	(51,547)
Net increase in loan servicing advances	(374,614)	(48,866)
Other, net	(179,350)	420,700
Cash flows from financing activities
Net increase in deposits	8,670,627	5,413,829
Net decrease in short-term borrowings	(525)	(3,183)
Payments on long-term borrowings	(852,945)	(753,123)
Purchases of treasury stock		(373,750)
Dividends paid — common	(142,044)	(143,170)
Dividends paid — preferred	(21,288)	(21,344)
Other, net	(9,569)	(10,567)
Net cash provided by financing activities	7,644,256	4,108,692
Net decrease in cash, cash equivalents and restricted cash	(292,754)	(138,113)
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	1,259,989	1,298,192
Supplemental disclosure of cash flow information
Interest received during the period	971,142	1,159,094
Interest paid during the period	55,378	158,861
Income taxes paid during the period	24,220	44,660
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	2,301	17,295
Additions to right-of-use assets under operating leases	$ 13,020	$ 17,421