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Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Jan. 01, 2023
Dec. 31, 2022
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                  
Allowance for credit losses $ 41,268 $ 35,280 $ 41,268 $ 35,280 $ 39,919 $ 37,160 $ 35,149   $ 28,511
Increase in allowance for credit losses     4,300            
Unfunded loan commitments 3,400   3,400         $ 3,400  
Increase in deferred tax assets     1,600            
Interest income 52,741 46,601 153,462 134,135          
Discount from loans to allowance for credit losses               1,700  
Decrease to Retained Earnings (198,034)   (198,034)     $ (183,788)      
Cumulative Effect, Period of Adoption, Adjustment [Member]                  
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                  
Decrease to Retained Earnings $ 6,100   $ 6,100         6,100  
Consumer Loan [Member]                  
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                  
Period past due for accrued interest receivable     90 days            
Revisions                  
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                  
Interest income   815   3,475          
Interest expense   $ 815   $ 3,475          
ASU 2016-13 [Member]                  
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                  
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true   true            
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2023   Jan. 01, 2023            
Allowance for credit losses                 $ 897
Unfunded loan commitments               3,386  
ASU 2016-13 [Member] | PCD Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]                  
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                  
Allowance for credit losses               $ 1,700  
ASU 2017-04 [Member]                  
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                  
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true   true            
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2023   Jan. 01, 2023            
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] true   true            
ASU 2022-02 [Member]                  
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                  
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] true   true            
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2023   Jan. 01, 2023            
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] true   true