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Fair Value - Estimated fair value and related carrying amount, of the Company's financial instruments (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Financial assets:      
Trading securities $ 56,580   $ 31,263
SBA servicing asset 6,200   6,100
Financial liabilities:      
Other borrowings 400,000    
Other derivative financial instruments (mortgage banking related) (58,426) $ 374,241  
Carrying Amount      
Financial assets:      
Cash and cash equivalents 1,513,749   1,312,563
Trading securities 56,580   31,263
Investment securities 7,731,217   8,189,780
Loans held for sale 42,951   28,968
Loans, net of allowance for credit losses 31,109,393   29,821,418
Accrued interest receivable 137,230   134,594
Mortgage servicing rights 87,539   86,610
SBA servicing asset 6,202   6,068
Interest rate swap - non-designated hedge 173,248   210,216
Other derivative financial instruments (mortgage banking related) $ 1,232   $ 800
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Noncurrent   Derivative Asset, Noncurrent
Financial liabilities:      
Noninterest-bearing $ 11,489,483   $ 13,168,656
Interest-bearing other than time deposits 20,826,961   20,761,981
Time deposits 4,425,434   2,419,986
Federal funds purchased and securities sold under agreements to repurchase 581,446   556,417
Corporate and subordinated debentures 392,090   392,275
Other borrowings 400,000    
Accrued interest payable 31,791   6,218
Interest rate swap - non-designated hedge 974,549   1,033,980
Other derivative financial instruments (mortgage banking related)     163
Other derivative financial instruments (mortgage banking related) 1,168    
Fair Value      
Financial assets:      
Cash and cash equivalents 1,513,749   1,312,563
Trading securities 56,580   31,263
Investment securities 7,290,576   7,756,707
Loans held for sale 42,951   28,968
Loans, net of allowance for credit losses 30,184,857   29,329,499
Accrued interest receivable 137,230   134,594
Mortgage servicing rights 87,539   86,610
SBA servicing asset 6,202    
Interest rate swap - non-designated hedge 173,248   210,216
Other derivative financial instruments (mortgage banking related) 1,232   800
Financial liabilities:      
Noninterest-bearing 11,489,483   13,168,656
Interest-bearing other than time deposits 20,826,961   20,761,981
Time deposits 4,351,601   2,333,764
Federal funds purchased and securities sold under agreements to repurchase 581,446   556,417
Corporate and subordinated debentures 385,920   377,360
Other borrowings 400,000    
Accrued interest payable 31,791   6,218
Interest rate swap - non-designated hedge 974,549   1,033,980
Other derivative financial instruments (mortgage banking related)     163
Other derivative financial instruments (mortgage banking related) 1,168    
Commitments to extend credit | Fair Value      
Financial liabilities:      
Commitments to extend credit (328,875)   (184,801)
Quoted Prices In Active Markets for Identical Assets (Level 1)      
Financial assets:      
Cash and cash equivalents 1,513,749   1,312,563
Investment securities 196,728   179,717
Significant Other Observable Inputs (Level 2)      
Financial assets:      
Trading securities 56,580   31,263
Investment securities 7,093,848   7,576,990
Loans held for sale 42,951   28,968
Accrued interest receivable 26,346   28,449
Interest rate swap - non-designated hedge 173,248   210,216
Other derivative financial instruments (mortgage banking related) 1,232   800
Financial liabilities:      
Noninterest-bearing 11,489,483   13,168,656
Interest-bearing other than time deposits 20,826,961   20,761,981
Time deposits 4,351,601   2,333,764
Federal funds purchased and securities sold under agreements to repurchase 581,446   556,417
Corporate and subordinated debentures 385,920   377,360
Other borrowings 400,000    
Accrued interest payable 31,791   3,345
Interest rate swap - non-designated hedge 974,549   1,033,980
Other derivative financial instruments (mortgage banking related)     163
Other derivative financial instruments (mortgage banking related) 1,168    
Significant Other Observable Inputs (Level 2) | Commitments to extend credit      
Financial liabilities:      
Commitments to extend credit (328,875)   (184,801)
Significant Unobservable Inputs (Level 3)      
Financial assets:      
Loans, net of allowance for credit losses 30,184,857   29,329,499
Accrued interest receivable 110,884   106,145
Mortgage servicing rights 87,539   86,610
SBA servicing asset $ 6,202   $ 6,068