Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash Flows From Operating Activities: [Abstract]
Net income	$ 351,901	$ 499,136
Adjustments to reconcile net income to net cash used in operating activities: [Abstract]
Provision for credit losses	15,000	(83,000)
Change in fair value of mortgage servicing rights due to market assumption changes	(83,165)	(33,778)
Change in the fair value of mortgage servicing rights due to principal payments	24,277	30,949
Net unrealized (gains) losses from derivative contracts	(31,677)	81,667
Share-based compensation	6,650	5,677
Depreciation and amortization	80,215	76,196
Net amortization of discounts and premiums	8,676	14,286
Net losses (gains) on financial instruments and other losses (gains), net	5,285	(57,467)
Net loss (gain) on mortgage loans held for sale	795	(56,423)
Mortgage loans originated for sale	(1,039,313)	(2,250,282)
Proceeds from sale of mortgage loans held for sale	1,085,632	2,376,479
Capitalized mortgage servicing rights	(15,810)	(29,307)
Change in trading and fair value option securities	6,951,932	(782,380)
Change in receivables	41,705	97,430
Change in other assets	9,899	206
Change in other liabilities	(68,084)	27,285
Net cash provided by (used in) operating activities	7,343,918	(83,326)
Cash Flows From Investing Activities: [Abstract]
Proceeds from maturities or redemptions of investment securities	100,418	28,970
Proceeds from maturities or redemptions of available for sale securities	1,827,825	2,682,934
Purchases of investment securities	10,000	0
Purchases of available for sale securities	(2,716,590)	(3,704,636)
Proceeds from sales of available for sale securities	242,135	488,274
Change in amount receivable on unsettled available for sale securities transactions	(11,348)	(176,600)
Loans originated, net of principal collected	(1,572,461)	2,690,611
Net payments on derivative asset contracts	(35,198)	33,183
Net change in restricted equity securities	(17,243)
Net change in restricted equity securities		93,849
Proceeds from disposition of assets	17,759	141,006
Purchases of assets	(151,320)	(130,146)
Net cash provided by (used in) investing activities	(2,326,023)	2,147,445
Cash Flows From Financing Activities: [Abstract]
Net change in demand deposits, transaction deposits and savings accounts	(4,580,959)	2,567,084
Net change in time deposits	(245,185)	(186,413)
Net change in other borrowed funds	(1,528,634)	(2,734,198)
Repayment of subordinated debentures	0	(150,000)
Net proceeds on derivative liability contracts	15,215	(32,591)
Net change in derivative margin accounts	271,418	(834,108)
Change in amount due on unsettled available for sale securities transactions	56,725	234,589
Issuance of common and treasury stock, net	(4,907)	(4,866)
Repurchase of common stock	(122,458)	(104,512)
Dividends paid	(107,611)	(107,699)
Net cash provided by (used in) financing activities	(6,246,396)	(1,352,714)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	(1,228,501)	711,405
Cash and cash equivalents at beginning of period	2,837,410	1,180,573
Cash and cash equivalents at end of period	1,608,909	1,891,978
Supplemental Cash Flow Information: [Abstract]
Cash paid for interest	80,759	52,304
Cash paid for taxes	67,147	120,879
Net loans and bank premises transferred to repossessed real estate and other assets	12,314	8,175
Transfer of available for sale securities to investment securities	2,454,273	0
Residential mortgage loans guaranteed by U.S. government agencies that became eligible for repurchase during the period	27,317	69,541
Conveyance of other real estate owned guaranteed by U.S. government agencies	5,882	4,956
Right-of-use assets obtained in exchange for operating lease liabilities	$ 21,198	$ 14,551