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Fair Value - Estimated fair value and related carrying amount, of the Company's financial instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financial assets:      
Trading securities $ 117,590   $ 110,183
Financial liabilities:      
Other derivative financial instruments (mortgage banking related) 7,658 $ (188,610)  
Carrying Amount      
Financial assets:      
Cash and cash equivalents 2,867,082   3,172,483
Trading securities 117,590   110,183
Investment securities 8,908,521   8,715,214
Loans held for sale 327,935   345,343
Loans, net of allowance for credit losses 48,910,901   48,013,330
Accrued interest receivable 239,877   233,265
Mortgage servicing rights 90,018   84,032
SBA servicing asset 5,176   5,512
Interest rate swap - non-designated hedge 189,355   221,835
Other derivative financial instruments (mortgage banking related) $ 1,977   $ 1,051
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Noncurrent   Derivative Asset, Noncurrent
Financial liabilities:      
Noninterest-bearing $ 13,650,799   $ 13,375,697
Interest-bearing other than time deposits 34,975,162   34,410,867
Time deposits 7,249,702   7,359,233
Federal funds purchased and securities sold under agreements to repurchase 643,386   618,215
Corporate and subordinated debentures 696,642   696,536
Accrued interest payable 46,748   48,972
Interest rate swap - non-designated hedge 560,264   554,433
Other derivative financial instruments (mortgage banking related) 2,142   315
Fair Value      
Financial assets:      
Cash and cash equivalents 2,867,082   3,172,483
Trading securities 117,590   110,183
Investment securities 8,585,410   8,400,034
Loans held for sale 330,177   348,381
Loans, net of allowance for credit losses 47,966,971   47,378,022
Accrued interest receivable 239,877   233,265
Mortgage servicing rights 90,018   84,032
SBA servicing asset 5,176   5,512
Interest rate swap - non-designated hedge 189,355   221,835
Other derivative financial instruments (mortgage banking related) $ 1,977   $ 1,051
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Noncurrent   Derivative Asset, Noncurrent
Financial liabilities:      
Noninterest-bearing $ 13,650,799   $ 13,375,697
Interest-bearing other than time deposits 34,975,162   34,410,867
Time deposits 7,234,725   7,347,648
Federal funds purchased and securities sold under agreements to repurchase 643,386   618,215
Corporate and subordinated debentures 676,337   683,772
Accrued interest payable 46,748   48,972
Interest rate swap - non-designated hedge 560,264   554,433
Other derivative financial instruments (mortgage banking related) 2,142   315
Quoted Prices In Active Markets for Identical Assets (Level 1)      
Financial assets:      
Cash and cash equivalents 2,867,082   3,172,483
Investment securities 272,804   274,730
Significant Other Observable Inputs (Level 2)      
Financial assets:      
Trading securities 117,590   110,183
Investment securities 8,214,486   8,046,606
Loans held for sale 330,177   348,381
Accrued interest receivable 37,007   35,302
Interest rate swap - non-designated hedge 189,355   221,835
Other derivative financial instruments (mortgage banking related) $ 1,977   $ 1,051
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Noncurrent   Derivative Asset, Noncurrent
Financial liabilities:      
Noninterest-bearing $ 13,650,799   $ 13,375,697
Interest-bearing other than time deposits 34,975,162   34,410,867
Time deposits 7,234,725   7,347,648
Federal funds purchased and securities sold under agreements to repurchase 643,386   618,215
Corporate and subordinated debentures 676,337   683,772
Accrued interest payable 46,748   48,972
Interest rate swap - non-designated hedge 560,264   554,433
Other derivative financial instruments (mortgage banking related) 2,142   315
Significant Unobservable Inputs (Level 3)      
Financial assets:      
Investment securities 98,120   78,698
Loans, net of allowance for credit losses 47,966,971   47,378,022
Accrued interest receivable 202,870   197,963
Mortgage servicing rights 90,018   84,032
SBA servicing asset $ 5,176   $ 5,512