Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows From Operating Activities: [Abstract]
Net income	$ 531,133	$ 520,293	$ 616,325
Adjustments to reconcile net income to net cash provided by (used in) operating activities: [Abstract]
Provision for credit losses	46,000	30,000	(100,000)
Change in fair value of mortgage servicing rights due to market changes	3,115	(80,261)	(41,637)
Change in fair value of mortgage servicing rights due to principal payments	27,343	31,741	38,761
Net unrealized losses (gains) from derivative contracts	133,118	(52,214)	30,201
Share-based compensation	16,350	11,564	9,759
Depreciation and amortization	109,893	107,563	102,468
Net amortization of discounts and premiums	(19,985)	9,215	18,293
Net losses (gains) on financial instruments and other losses (gains), net	(26,162)	846	(67,446)
Net loss (gain) on mortgage loans held for sale	4,483	(2,948)	(70,464)
Mortgage loans originated for sale	(666,391)	(1,180,403)	(2,818,789)
Proceeds from sale of mortgage loans held for sale	679,389	1,295,588	2,939,522
Capitalized mortgage servicing rights	(12,141)	(18,215)	(31,132)
Change in trading and fair value option securities	(453,340)	4,419,761	(4,357,950)
Change in receivables	(316,819)	(34,301)	39,183
Change in other assets	89,930	13,205	(12,568)
Change in other liabilities	(79,733)	50,836	12,897
Net cash provided by (used in) operating activities	66,183	5,122,270	(3,692,577)
Cash Flows From Investing Activities: [Abstract]
Proceeds from maturities or redemptions of investment securities	268,263	157,796	33,865
Proceeds from maturities or redemptions of available for sale securities	1,558,160	2,192,200	3,500,081
Purchases of investment securities	(2,504)	(10,000)	0
Purchases of available for sale securities	(2,951,422)	(4,533,892)	(4,607,199)
Proceeds from sales of available for sale securities	834,704	307,481	622,881
Change in amount receivable on unsettled available for sale securities transactions	(86,110)	9,629	(10,406)
Loans originated, net of principal collected	(1,349,900)	(2,348,586)	2,853,326
Net payments or proceeds on derivative asset contracts	154,602	(7,099)	161,093
Sale of subsidiary	32,601	0	0
Net change in restricted equity securities	(123,448)	(216,538)
Net change in restricted equity securities			88,278
Proceeds from disposition of assets	39,708	60,769	165,040
Purchases of assets	(165,918)	(215,046)	(204,287)
Net cash provided by (used in) investing activities	(1,791,264)	(4,603,286)	2,602,672
Cash Flows From Financing Activities: [Abstract]
Net change in demand deposits, transaction deposits and savings accounts	(2,011,184)	(6,518,868)	5,360,979
Net change in time deposits	1,550,180	(242,486)	(262,800)
Net change in other borrowed funds	1,802,549	4,609,824	(1,269,241)
Repayment of subordinated debentures	0	0	(150,000)
Change in amount due on unsettled security purchases	190,085	(17,782)	(117,452)
Issuance of common and treasury stock, net	(4,941)	(4,907)	(4,874)
Net change in derivative margin accounts	631,433	519,797	(467,865)
Net payments or proceeds on derivative liability contracts	(166,275)	(1,569)	(79,962)
Repurchase of common stock	(176,819)	(154,887)	(117,938)
Dividends paid	(143,398)	(143,800)	(144,105)
Net cash provided by (used in) financing activities	1,671,630	(1,954,678)	2,746,742
Net increase (decrease) in cash and cash equivalents	(53,451)	(1,435,694)	1,656,837
Cash and cash equivalents at beginning of period	1,401,716	2,837,410	1,180,573
Cash and cash equivalents at end of period	1,348,265	1,401,716	2,837,410
Supplemental Cash Flow Information: [Abstract]
Cash paid for interest	1,044,950	176,081	68,775
Cash paid for taxes	173,916	79,532	135,331
Net loans and bank premises transferred to repossessed real estate and other assets	787	12,326	8,320
Transfer of available for sale securities to investment securities, Fair Value	0	2,454,273	0
Residential mortgage loans guaranteed by U.S. government agencies that became eligible for repurchase during the period	14,466	34,259	87,087
Conveyance of other real estate owned guaranteed by U.S. government agencies	5,534	8,451	6,376
Right-of-use assets obtained in exchange for operating lease liabilities	$ 71,865	$ 22,059	$ 40,798