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Loans and Allowance for Credit Losses - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Contract
Dec. 31, 2021
USD ($)
Contract
Dec. 31, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non Accrual Status Of Loans After Number Of Days Past Due 90 days      
Loans Receivable Held-for-sale, Amount $ 29,820 $ 11,869    
Provision for credit losses 17,759 17,521 $ (377)  
Charge-offs (33,267) (9,845) $ (13,058)  
Recorded Investment $ 39,472 $ 35,487    
Number of loans modified | Contract   5 30  
Total amount of loan modified   $ 676 $ 1,690  
Total gains or losses included in earnings   0    
Loans with modification to rate and payment due to amortization   10 400  
Minimum days required for conversion of trouble debt to be in default 90 days      
Unearned Deferred (Fees) Costs on Loans $ 8,200 5,900    
Unearned Premiums (25,700) (5,400)    
Loans 8,968,761 7,642,143    
Loans and Leases Receivable, Gross $ 8,968,761 7,642,143    
Forecasted Value, National Unemployment, Percent 3.79%      
Financing Receivable, Allowance for Credit Loss $ 117,718 102,906 92,522 $ 101,309
Weighted Average [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Forecasted Value, National Unemployment, Percent 4.55%      
Maximum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Forecasted Value, National Unemployment, Percent 4.82%      
Impaired Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Unfunded commitments related to nonperforming loans $ 100 200    
Loans To Individuals [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non Accrual Status Of Loans After Number Of Days Past Due 150 days      
Nonaccrual Commercial Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans Receivable Held-for-sale, Amount $ 0 0    
Gain (loss) on sale of impaired loans 0 0 $ 400  
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Impaired Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Off-Balance-Sheet, Credit Loss, Liability 0 0    
Commercial Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 1,543,349 1,211,706    
Loans and Leases Receivable, Gross 1,543,349 1,211,706    
Commercial Loan [Member] | Payroll Protection Program Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 200 $ 4,300    
Financing Receivable, Allowance for Credit Loss $ 0