Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash Flows From Operating Activities: [Abstract]
Net income	$ 83,694	$ 162,496
Adjustments to reconcile net income to net cash used in operating activities: [Abstract]
Provision for credit losses	8,000	16,000
Change in fair value of mortgage servicing rights due to market assumption changes	(10,977)	6,059
Change in the fair value of mortgage servicing rights due to principal payments	5,447	5,382
Net unrealized (gains) losses from derivative contracts	(67,516)	61,704
Share-based compensation	4,548	6,701
Depreciation and amortization	26,392	26,885
Net amortization of discounts and premiums	(8,923)	(4,163)
Net losses (gains) on financial instruments and other losses (gains), net	40,792	(2,009)
Net loss (gain) on mortgage loans held for sale	(1,644)	1,361
Mortgage loans originated for sale	(139,176)	(138,624)
Proceeds from sale of mortgage loans held for sale	124,187	139,088
Capitalized mortgage servicing rights	(2,516)	(2,498)
Change in trading and fair value option securities	(246,669)	2,140,101
Change in receivables	284,991	11,032
Change in other assets	23,196	6,721
Change in other liabilities	55,394	28,544
Net cash provided by (used in) operating activities	179,220	2,464,780
Cash Flows From Investing Activities: [Abstract]
Proceeds from maturities or redemptions of investment securities	57,642	64,514
Proceeds from maturities or redemptions of available for sale securities	417,103	313,935
Purchases of available for sale securities	(1,582,902)	(631,168)
Proceeds from sales of available for sale securities	735,994	0
Change in amount receivable on unsettled available for sale securities transactions	48,195	9,864
Loans originated, net of principal collected	(271,674)	(187,088)
Net proceeds from (payments on) derivative asset contracts	(5,533)	156,522
Net change in restricted equity securities	40,550	11,470
Proceeds from disposition of assets	4,624	7,401
Purchases of assets	(40,911)	(58,710)
Net cash provided by (used in) investing activities	(596,912)	(313,260)
Cash Flows From Financing Activities: [Abstract]
Net change in demand deposits, transaction deposits and savings accounts	1,008,959	(2,014,726)
Net change in time deposits	354,887	114,768
Net change in other borrowed funds	(839,632)	(677,232)
Net payments on derivative liability contracts	(1,613)	(158,021)
Net change in derivative margin accounts	(116,706)	579,188
Change in amount due on unsettled available for sale securities transactions	(89,807)	52,104
Issuance of common and treasury stock, net	(3,192)	(4,501)
Repurchase of common stock	(52,153)	(44,476)
Dividends paid	(35,569)	(36,356)
Net cash provided by (used in) financing activities	225,174	(2,189,252)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total	(192,518)	(37,732)
Cash and cash equivalents at beginning of period	1,348,265	1,401,716
Cash and cash equivalents at end of period	1,155,747	1,363,984
Supplemental Cash Flow Information: [Abstract]
Cash paid for interest	348,394	163,960
Cash paid for taxes	1,270	733
Net loans and bank premises transferred to repossessed real estate and other assets	77	225
Residential mortgage loans guaranteed by U.S. government agencies that became eligible for repurchase during the period	1,501	5,556
Conveyance of other real estate owned guaranteed by U.S. government agencies	1,371	1,150
Right-of-use assets obtained in exchange for operating lease liabilities	$ 10,562	$ 63,521