Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2025		Dec. 31, 2024
Assets [Abstract]
Cash and due from banks	$ 1,001,107		$ 1,043,969
Interest-bearing cash and cash equivalents	656,995		390,732
Trading securities	5,392,745		4,899,090
Investment securities	1,784,242	[1]	2,017,225	[2]
Available-for-sale securities	13,606,625		12,851,600
Fair value option securities	102,096		17,876
Restricted equity securities	224,757		406,178
Residential mortgage loans held for sale	94,630		77,561
Loans	25,651,462		24,114,724
Allowance for loan losses	(275,860)		(280,035)
Loans, net of allowance	25,375,602		23,834,689
Premises and equipment, net	638,936		634,485
Receivables	292,978		281,091
Goodwill	1,044,749		1,044,749
Intangible assets, net	34,752		46,788
Mortgage servicing rights	322,724		338,145
Real estate and other repossessed assets, net of allowance	176		2,254
Derivative contracts, net	300,775		242,809
Cash surrender value of bank-owned life insurance	421,514		416,741
Receivable on unsettled securities sales	62,034		4,825
Other assets	880,064		1,135,085
Total assets	52,237,501		49,685,892
Deposits [Abstract]
Non-interest bearing demand deposits	8,081,930		8,371,897
Interest-bearing Deposit Liabilities [Abstract]
Transaction	26,850,070		25,455,106
Savings	863,923		828,817
Time	3,639,083		3,535,410
Total deposits	39,435,006		38,191,230
Funds purchased and repurchase agreements	1,491,716		1,292,856
Other borrowings	2,745,939		3,030,123
Subordinated debentures	396,589		131,200
Accrued interest, taxes, and expense	382,809		352,345
Derivative contracts, net	397,573		237,582
Due on unsettled securities purchases	991,073		405,494
Other liabilities	476,116		494,105
Total liabilities	46,316,821		44,134,935
Shareholders' equity: [Abstract]
Common stock	5		5
Capital surplus	1,429,369		1,429,628
Retained earnings	6,022,586		5,592,100
Treasury stock	(1,367,144)		(970,340)
Accumulated other comprehensive loss	(166,170)		(503,040)
Total shareholders’ equity	5,918,646		5,548,353
Non-controlling interests	2,034		2,604
Total equity	5,920,680		5,550,957
Total liabilities and equity	$ 52,237,501		$ 49,685,892

[1] Carrying value includes $83 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the Available-for-Sale securities portfolio to the Investment securities portfolio.

[2] Carrying value includes $119 million of net unrealized loss which remains in AOCI in the Consolidated Balance Sheets related to certain securities transferred during the second quarter of 2022 from the Available-for-Sale securities portfolio to the Investment securities portfolio.