Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets [Abstract]
Cash and due from banks	$ 947,613	$ 943,810
Interest-bearing cash and cash equivalents	400,652	457,906
Trading securities	5,193,505	4,464,161
Investment securities	2,244,153	2,513,687
Available for sale securities	12,286,681	11,493,860
Fair value option securities	20,671	296,590
Restricted equity securities	423,099	299,651
Residential mortgage loans held for sale	56,935	75,272
Loans	23,904,968	22,557,150
Allowance for loan losses	(277,123)	(235,704)
Loans, net of allowance	23,627,845	22,321,446
Premises and equipment, net	622,223	565,175
Receivables	317,922	273,815
Goodwill	1,044,749	1,044,749	$ 1,044,749
Intangible assets, net	59,979	76,131
Mortgage servicing rights	293,884	277,608	163,198
Real estate and other repossessed assets, net of allowance	2,875	14,304
Derivative contracts, net	410,304	880,343
Cash surrender value of bank-owned life insurance	409,548	406,751
Receivable on unsettled securities sales	391,910	31,004
Other assets	1,070,282	1,354,379
Total assets	49,824,830	47,790,642
Deposits [Abstract]
Noninterest-bearing demand deposits	9,196,493	13,395,337
Interest-bearing Deposit Liabilities [Abstract]
Transaction	20,964,101	18,659,115
Savings	847,085	964,411
Time	3,012,022	1,461,842
Total deposits	34,019,701	34,480,705
Funds purchased and repurchase agreements	1,122,748	2,270,377
Other borrowings	7,701,552	4,736,908
Subordinated debentures	131,150	131,205
Accrued interest, taxes and expense	338,996	296,870
Derivative contracts, net	587,473	554,900
Due on unsettled securities purchases	254,057	147,470
Other liabilities	523,734	484,849
Total liabilities	44,679,411	43,103,284
Shareholders' equity: [Abstract]
Common stock	5	5
Capital surplus	1,406,745	1,390,395
Retained earnings	5,211,512	4,824,164
Treasury stock	(876,720)	(694,960)
Accumulated other comprehensive income (loss)	(599,100)	(836,955)	72,371
Total shareholders’ equity	5,142,442	4,682,649
Non-controlling interests	2,977	4,709
Total equity	5,145,419	4,687,358	$ 5,368,371
Total liabilities and equity	$ 49,824,830	$ 47,790,642