Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows From Operating Activities: [Abstract]
Net income	$ 520,293	$ 616,325	$ 435,071
Adjustments to reconcile net income to net cash provided by (used in) operating activities: [Abstract]
Provision for credit losses	30,000	(100,000)	222,592
Change in fair value of mortgage servicing rights due to market changes	(80,261)	(41,637)	79,524
Change in fair value of mortgage servicing rights due to principal payments	31,741	38,761	41,598
Net unrealized losses (gains) from derivative contracts	(52,214)	30,201	(59,253)
Share-based compensation	11,564	9,759	16,392
Depreciation and amortization	107,563	102,468	99,013
Net amortization of discounts and premiums	9,215	18,293	5,357
Net losses (gains) on financial instruments and other losses (gains), net	846	(67,446)	(15,949)
Net gain on mortgage loans held for sale	(2,948)	(70,464)	(114,545)
Mortgage loans originated for sale	(1,180,403)	(2,818,789)	(3,764,112)
Proceeds from sale of mortgage loans held for sale	1,295,588	2,939,522	3,817,475
Capitalized mortgage servicing rights	(18,215)	(31,132)	(31,209)
Change in trading and fair value option securities	4,419,761	(4,357,950)	(2,103,931)
Change in receivables	(34,301)	39,183	945,087
Change in other assets	13,205	(12,568)	1,739
Change in other liabilities	50,836	12,897	8,895
Net cash provided by (used in) operating activities	5,122,270	(3,692,577)	(416,256)
Cash Flows From Investing Activities: [Abstract]
Proceeds from maturities or redemptions of investment securities	157,796	33,865	46,992
Proceeds from maturities or redemptions of available for sale securities	2,192,200	3,500,081	2,695,067
Purchases of investment securities	(10,000)	0	0
Purchases of available for sale securities	(4,533,892)	(4,607,199)	(4,575,324)
Proceeds from sales of available for sale securities	307,481	622,881	384,507
Change in amount receivable on unsettled available for sale securities transactions	9,629	(10,406)	(6,357)
Loans originated, net of principal collected	(2,348,586)	2,853,326	(1,103,752)
Net payments or proceeds on derivative asset contracts	(7,099)	161,093	(121,130)
Net change in restricted equity securities	(216,538)
Net change in restricted equity securities		88,278	289,161
Proceeds from disposition of assets	60,769	165,040	73,135
Purchases of assets	(215,046)	(204,287)	(141,134)
Net cash provided by (used in) investing activities	(4,603,286)	2,602,672	(2,458,835)
Cash Flows From Financing Activities: [Abstract]
Net change in demand deposits, transaction deposits and savings accounts	(6,518,868)	5,360,979	8,773,433
Net change in time deposits	(242,486)	(262,800)	(250,721)
Net change in other borrowed funds	4,609,824	(1,269,241)	(5,091,026)
Repayment of subordinated debentures	0	(150,000)	0
Change in amount due on unsettled security purchases	(17,782)	(117,452)	63,521
Issuance of common and treasury stock, net	(4,907)	(4,874)	(4,933)
Net change in derivative margin accounts	519,797	(467,865)	(600,218)
Net payments or proceeds on derivative liability contracts	(1,569)	(79,962)	127,054
Repurchase of common stock	(154,887)	(117,938)	(75,830)
Dividends paid	(143,800)	(144,105)	(144,437)
Net cash provided by (used in) financing activities	(1,954,678)	2,746,742	2,796,843
Net increase (decrease) in cash and cash equivalents	(1,435,694)	1,656,837	(78,248)
Cash and cash equivalents at beginning of period	2,837,410	1,180,573	1,258,821
Cash and cash equivalents at end of period	1,401,716	2,837,410	1,180,573
Supplemental Cash Flow Information: [Abstract]
Cash paid for interest	176,081	68,775	160,288
Cash paid for taxes	79,532	135,331	136,181
Net loans and bank premises transferred to repossessed real estate and other assets	12,326	8,320	85,323
Transfer of available for sale securities to investment securities, Fair Value	2,454,273	0	0
Increase in U.S. government guaranteed loans eligible for repurchase	34,259	87,087	290,977
Increase in receivables from conveyance of GNMA OREO	8,451	6,376	11,322
Right-of-use assets obtained in exchange for operating lease liabilities	$ 22,059	$ 40,798	$ 16,177