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Loans and Allowance for Credit Losses on Loans - Additional Information (Details)
3 Months Ended
Mar. 31, 2023
USD ($)
factor
Jan. 01, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Loans And Leases Receivable Disclosure [Line Items]          
Loans, related parties $ 0   $ 0    
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 1,692,485,000   1,678,292,000    
Allowance for loan losses 20,814,000 $ 21,165,000 19,241,000 $ 16,672,000 $ 16,123,000
Collateralized Debt Obligations          
Loans And Leases Receivable Disclosure [Line Items]          
Collateral dependent loans 1,900,000        
Allowance for loan losses 259,000        
SBA—non-real estate          
Loans And Leases Receivable Disclosure [Line Items]          
Collateral dependent loans 13,275,000   13,377,000    
Allowance for loan losses $ 67,000 $ 65,000 $ 207,000 $ 169,000 $ 199,000