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Allowance for Credit Losses - Schedule of Allowance for Loan Losses and Carrying Amount of Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan and Lease Losses Beginning balance $ 271,844 $ 259,237  
Initial allowance for PCD loans (acquired during the period) 17,518 0 $ 0
Charge-offs (50,912) (17,530)  
Recoveries 5,200 4,985  
Provision 53,868 25,152 31,154
Allowance for Loan and Lease Losses Ending balance 297,518 271,844 259,237
Construction & Land Development [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan and Lease Losses Beginning balance 63,621 59,913  
Initial allowance for PCD loans (acquired during the period) 4,584    
Charge-offs (408) (29)  
Recoveries 225 319  
Provision (10,055) 3,418  
Allowance for Loan and Lease Losses Ending balance 57,967 63,621 59,913
Bank Card [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan and Lease Losses Beginning balance 891 810  
Initial allowance for PCD loans (acquired during the period) 0    
Charge-offs (320) (431)  
Recoveries 55 19  
Provision 263 493  
Allowance for Loan and Lease Losses Ending balance 889 891 810
Commercial Real Estate [Member] | Owner-Occupied [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan and Lease Losses Beginning balance 11,852 11,895  
Initial allowance for PCD loans (acquired during the period) 795    
Charge-offs (228) (116)  
Recoveries 318 1,183  
Provision 827 (1,110)  
Allowance for Loan and Lease Losses Ending balance 13,564 11,852 11,895
Commercial Real Estate [Member] | Nonowner-Occupied [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan and Lease Losses Beginning balance 74,522 57,935  
Initial allowance for PCD loans (acquired during the period) 11,059    
Charge-offs (35,798) (2,581)  
Recoveries 160 200  
Provision 46,773 18,968  
Allowance for Loan and Lease Losses Ending balance 96,716 74,522 57,935
Other Commercial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan and Lease Losses Beginning balance 65,105 75,007  
Initial allowance for PCD loans (acquired during the period) 872    
Charge-offs (5,424) (3,589)  
Recoveries 2,309 1,650  
Provision (1,133) (7,963)  
Allowance for Loan and Lease Losses Ending balance 61,729 65,105 75,007
Residential Real Estate [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan and Lease Losses Beginning balance 46,373 41,167  
Initial allowance for PCD loans (acquired during the period) 208    
Charge-offs (999) (481)  
Recoveries 704 495  
Provision 7,663 5,192  
Allowance for Loan and Lease Losses Ending balance 53,949 46,373 41,167
Other Consumer [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for Loan and Lease Losses Beginning balance 9,480 12,510  
Initial allowance for PCD loans (acquired during the period) 0    
Charge-offs (7,735) (10,303)  
Recoveries 1,429 1,119  
Provision 9,530 6,154  
Allowance for Loan and Lease Losses Ending balance $ 12,704 $ 9,480 $ 12,510