Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash Flows From Operating Activities: [Abstract]
Net income	$ 448,611	$ 351,901
Adjustments to reconcile net income to net cash used in operating activities: [Abstract]
Provision for credit losses	40,000	15,000
Change in fair value of mortgage servicing rights due to market assumption changes	(11,241)	(83,165)
Change in the fair value of mortgage servicing rights due to principal payments	21,031	24,277
Net unrealized (gains) losses from derivative contracts	(55,127)	(31,677)
Share-based compensation	14,273	6,650
Depreciation and amortization	81,002	80,215
Net amortization of discounts and premiums	(14,216)	8,676
Net losses (gains) on financial instruments and other losses (gains), net	(12,702)	5,285
Net loss (gain) on mortgage loans held for sale	4,306	795
Mortgage loans originated for sale	(527,136)	(1,039,313)
Proceeds from sale of mortgage loans held for sale	527,115	1,085,632
Capitalized mortgage servicing rights	(9,757)	(15,810)
Change in trading and fair value option securities	(7,477)	6,951,932
Change in receivables	14,079	41,705
Change in other assets	74,107	9,899
Change in other liabilities	(58,926)	(68,084)
Net cash provided by (used in) operating activities	527,942	7,343,918
Cash Flows From Investing Activities: [Abstract]
Proceeds from maturities or redemptions of investment securities	214,869	100,418
Proceeds from maturities or redemptions of available for sale securities	1,134,602	1,827,825
Purchases of investment securities	(2,504)	(10,000)
Purchases of available for sale securities	(1,843,827)	(2,716,590)
Proceeds from sales of available for sale securities	135,489	242,135
Change in amount receivable on unsettled available for sale securities transactions	7,471	(11,348)
Loans originated, net of principal collected	(1,168,401)	(1,572,461)
Net payments on derivative asset contracts	143,543	(35,198)
Net change in restricted equity securities	(135,461)	(17,243)
Proceeds from disposition of assets	36,993	17,759
Purchases of assets	(128,902)	(151,320)
Net cash provided by (used in) investing activities	(1,606,128)	(2,326,023)
Cash Flows From Financing Activities: [Abstract]
Net change in demand deposits, transaction deposits and savings accounts	(2,293,528)	(4,580,959)
Net change in time deposits	1,465,375	(245,185)
Net change in other borrowed funds	1,906,678	(1,528,634)
Net proceeds on derivative liability contracts	(153,692)	15,215
Net change in derivative margin accounts	312,397	271,418
Change in amount due on unsettled available for sale securities transactions	53,219	56,725
Issuance of common and treasury stock, net	(4,695)	(4,907)
Repurchase of common stock	(126,611)	(122,458)
Dividends paid	(107,738)	(107,611)
Net cash provided by (used in) financing activities	1,051,405	(6,246,396)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	(26,781)	(1,228,501)
Cash and cash equivalents at beginning of period	1,401,716	2,837,410
Cash and cash equivalents at end of period	1,374,935	1,608,909
Supplemental Cash Flow Information: [Abstract]
Cash paid for interest	706,011	80,759
Cash paid for taxes	156,092	67,147
Net loans and bank premises transferred to repossessed real estate and other assets	367	12,314
Transfer of available for sale securities to investment securities	0	2,454,273
Residential mortgage loans guaranteed by U.S. government agencies that became eligible for repurchase during the period	10,679	27,317
Conveyance of other real estate owned guaranteed by U.S. government agencies	4,007	5,882
Right-of-use assets obtained in exchange for operating lease liabilities	$ 65,241	$ 21,198