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Loans and Allowance for Credit Losses on Loans - Additional Information (Details)
9 Months Ended
Sep. 30, 2023
USD ($)
factor
Jun. 30, 2023
USD ($)
Jan. 01, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Loans And Leases Receivable Disclosure [Line Items]              
Loans, related parties $ 1,737,908,000     $ 1,659,051,000      
Historical loss of reversion period, baseline scenario 1 year            
Historical loss of reversion period, adverse scenario 2 years            
Number of matrix factors | factor 9            
Non accrual loan $ 250,000            
Assess nonaccrual loans 250,000            
Collateral dependent loans 1,759,525,000     1,678,292,000      
Allowance for loan losses 21,617,000 $ 20,802,000 $ 21,165,000 19,241,000 $ 18,369,000 $ 17,702,000 $ 16,123,000
Loan Borrowing              
Loans And Leases Receivable Disclosure [Line Items]              
Loans, related parties 0     0      
Collateralized Debt Obligations              
Loans And Leases Receivable Disclosure [Line Items]              
Collateral dependent loans 3,800,000            
Allowance for loan losses 14,000            
SBA—non-real estate              
Loans And Leases Receivable Disclosure [Line Items]              
Collateral dependent loans 14,575,000     13,377,000      
Allowance for loan losses $ 150,000 $ 55,000 $ 65,000 $ 207,000 $ 147,000 $ 135,000 $ 199,000