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Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Jan. 01, 2023
Dec. 31, 2022
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Allowance for credit losses   $ 35,280 $ 35,149   $ 28,511
Allowance for credit losses $ 5,193 4,300      
Unfunded loan commitments   3,400   $ 3,400  
Increase in deferred tax assets   1,600      
Discount from loans to allowance for credit losses       1,700  
Decrease to Retained Earnings   176,644     156,492
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  
Consumer Loan [Member]          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Period past due for accrued interest receivable   90 days      
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      
Change in Accounting Principle, Accounting Standards Update, Adoption Date   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       $ 1,668  
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      
Change in Accounting Principle, Accounting Standards Update, Adoption Date   Jan. 01, 2023      
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]   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      
Change in Accounting Principle, Accounting Standards Update, Adoption Date   Jan. 01, 2023      
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]   true