Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash Flows From Operating Activities: [Abstract]
Net income	$ 314,132	$ 195,310
Adjustments to reconcile net income to net cash used in operating activities: [Abstract]
Provision for credit losses	33,000	0
Change in fair value of mortgage servicing rights due to market assumption changes	(3,202)	(66,595)
Change in the fair value of mortgage servicing rights due to principal payments	13,829	15,317
Net unrealized (gains) losses from derivative contracts	(25,310)	(47,004)
Share-based compensation	11,114	2,845
Depreciation and amortization	56,583	52,971
Net amortization of discounts and premiums	(8,733)	6,417
Net losses (gains) on financial instruments and other losses (gains), net	(11,617)	7,157
Net loss (gain) on mortgage loans held for sale	2,153	(6,521)
Mortgage loans originated for sale	(353,409)	(779,103)
Proceeds from sale of mortgage loans held for sale	332,944	793,223
Capitalized mortgage servicing rights	(6,603)	(10,969)
Change in trading and fair value option securities	(893,843)	6,283,157
Change in receivables	(82,491)	62,029
Change in other assets	44,365	(17,067)
Change in other liabilities	17,318	(55,875)
Net cash provided by (used in) operating activities	(559,770)	6,435,292
Cash Flows From Investing Activities: [Abstract]
Proceeds from maturities or redemptions of investment securities	140,043	26,730
Proceeds from maturities or redemptions of available for sale securities	656,703	1,365,103
Purchases of investment securities	(2,504)	0
Purchases of available for sale securities	(1,266,764)	(1,919,632)
Proceeds from sales of available for sale securities	135,489	211,301
Change in amount receivable on unsettled available for sale securities transactions	(10,548)	(19,793)
Loans originated, net of principal collected	(678,700)	(1,070,725)
Net payments on derivative asset contracts	156,205	151,559
Net change in restricted equity securities	(30,435)	(12,017)
Proceeds from disposition of assets	29,136	11,559
Purchases of assets	(97,875)	(119,302)
Net cash provided by (used in) investing activities	(969,250)	(1,375,217)
Cash Flows From Financing Activities: [Abstract]
Net change in demand deposits, transaction deposits and savings accounts	(2,430,397)	(2,288,412)
Net change in time deposits	1,244,535	(334,729)
Net change in other borrowed funds	2,208,867	(1,671,503)
Net proceeds on derivative liability contracts	(151,457)	(131,361)
Net change in derivative margin accounts	707,266	(1,417,338)
Change in amount due on unsettled available for sale securities transactions	139,688	132,781
Issuance of common and treasury stock, net	(4,695)	(4,907)
Repurchase of common stock	(67,066)	(72,478)
Dividends paid	(72,107)	(72,188)
Net cash provided by (used in) financing activities	1,574,634	(5,860,135)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	45,614	(800,060)
Cash and cash equivalents at beginning of period	1,401,716	2,837,410
Cash and cash equivalents at end of period	1,447,330	2,037,350
Supplemental Cash Flow Information: [Abstract]
Cash paid for interest	401,187	35,094
Cash paid for taxes	123,821	66,862
Net loans and bank premises transferred to repossessed real estate and other assets	225	4,080
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	7,768	20,836
Conveyance of other real estate owned guaranteed by U.S. government agencies	2,569	3,478
Right-of-use assets obtained in exchange for operating lease liabilities	$ 64,899	$ 15,506