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Fair Value - Estimated fair value and related carrying amount, of the Company's financial instruments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financial assets:      
Trading securities $ 102,932 $ 31,321  
Financial liabilities:      
Other derivative financial instruments (mortgage banking related) 75,369 (229,657) $ 741,583
Carrying Amount      
Financial assets:      
Cash and cash equivalents 1,392,067 998,877  
Trading securities 102,932 31,321  
Investment securities 6,798,876 7,463,871  
Mortgage loans held for sale 279,426 50,888  
Loans, net of allowance for credit losses 33,437,647 31,931,916  
Accrued interest receivable 163,402 154,400  
Mortgage servicing rights 89,795 85,164  
SBA servicing asset 6,028 5,952  
Interest rate swap - non-designated hedge 160,407 169,180  
Other derivative financial instruments (mortgage banking related) $ 1,083 $ 3,759  
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Noncurrent Derivative Asset, Noncurrent  
Financial liabilities:      
Noninterest-bearing $ 10,192,117 $ 10,649,274  
Interest-bearing other than time deposits 23,703,027 22,149,682  
Time deposits 4,165,722 4,249,953  
Federal funds purchased and securities sold under agreements to repurchase 514,912 489,185  
Corporate and subordinated debentures 391,534 391,904  
Other borrowings   100,000  
Accrued interest payable 40,739 56,808  
Interest rate swap - non-designated hedge 878,046 803,539  
Other derivative financial instruments (mortgage banking related) 1,809 947  
Fair Value      
Financial assets:      
Cash and cash equivalents 1,392,067 998,877  
Trading securities 102,932 31,321  
Investment securities 6,378,734 7,061,167  
Mortgage loans held for sale 281,662 50,888  
Loans, net of allowance for credit losses 32,448,618 30,709,513  
Accrued interest receivable 163,402 154,400  
Mortgage servicing rights 89,795 85,164  
SBA servicing asset 6,028 5,952  
Interest rate swap - non-designated hedge 160,407 169,180  
Other derivative financial instruments (mortgage banking related) $ 1,083 $ 3,759  
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Noncurrent Derivative Asset, Noncurrent  
Financial liabilities:      
Noninterest-bearing $ 10,192,117 $ 10,649,274  
Interest-bearing other than time deposits 23,703,027 22,149,682  
Time deposits 4,145,687 4,208,498  
Federal funds purchased and securities sold under agreements to repurchase 514,912 489,185  
Corporate and subordinated debentures 377,616 388,909  
Other borrowings   100,000  
Accrued interest payable 40,739 56,808  
Interest rate swap - non-designated hedge 878,046 803,539  
Other derivative financial instruments (mortgage banking related) 1,809 947  
Quoted Prices In Active Markets for Identical Assets (Level 1)      
Financial assets:      
Cash and cash equivalents 1,392,067 998,877  
Investment securities 187,266 192,043  
Significant Other Observable Inputs (Level 2)      
Financial assets:      
Trading securities 102,932 31,321  
Investment securities 6,155,120 6,869,124  
Mortgage loans held for sale 281,662 50,888  
Accrued interest receivable 25,035 26,706  
Interest rate swap - non-designated hedge 160,407 169,180  
Other derivative financial instruments (mortgage banking related) $ 1,083 $ 3,759  
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Noncurrent Derivative Asset, Noncurrent  
Financial liabilities:      
Noninterest-bearing $ 10,192,117 $ 10,649,274  
Interest-bearing other than time deposits 23,703,027 22,149,682  
Time deposits 4,145,687 4,208,498  
Federal funds purchased and securities sold under agreements to repurchase 514,912 489,185  
Corporate and subordinated debentures 377,616 388,909  
Other borrowings   100,000  
Accrued interest payable 40,739 56,808  
Interest rate swap - non-designated hedge 878,046 803,539  
Other derivative financial instruments (mortgage banking related) 1,809 947  
Significant Unobservable Inputs (Level 3)      
Financial assets:      
Investment securities 36,348    
Loans, net of allowance for credit losses 32,448,618 30,709,513  
Accrued interest receivable 138,367 127,694  
Mortgage servicing rights 89,795 85,164  
SBA servicing asset $ 6,028 $ 5,952