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Allowance for Credit Losses - Narrative (Details)
 9 Months Ended
Sep. 30, 2023
USD ($)
Unit
loan_class
Jun. 30, 2023
USD ($)
Jan. 01, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for loan losses $ 23,322,000 $ 23,465,000   $ 16,723,000 $ 16,387,000 $ 16,201,000 $ 15,521,000
Number of loan classes | loan_class 10            
Loan-to-value percent, commercial real estate 80.00%            
Construction loans, percent of capital 37.30%            
Construction loans, maximum percent of capital 100.00%            
Construction loans and non-owner-occupied commercial real estate loans, percent of capital 215.50%            
Construction loans and non-owner-occupied commercial real estate loans, maximum percent of capital 300.00%            
Allowance for loan losses as a percent of total loans 1.12%     0.87% 0.88%    
Outstanding loans and commitments subject by independent consulting firm 60.00%            
Cumulative Effect, Period of Adoption, Adjustment              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for loan losses     $ 6,210,000 $ 6,210,000      
Commercial              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Amount of claims under review by management $ 750,000            
Commercial | Construction              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for loan losses $ 1,602,000 1,469,000   821,000 $ 1,121,000 1,151,000 746,000
Loan maturities 2 years            
Commercial | Construction | Cumulative Effect, Period of Adoption, Adjustment              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for loan losses       943,000      
Commercial | Multifamily              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for loan losses $ 1,277,000 1,312,000   0      
Number of units | Unit 5            
Commercial | Multifamily | Cumulative Effect, Period of Adoption, Adjustment              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for loan losses       1,184,000      
Residential              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan maturities 30 years            
Loan to value ratio 0.80            
Delinquent period before residential loans are placed on non-accrual status 90 days            
Delinquent period for loans charged off 180 days            
Delinquent period for loans charged off after receipt of notification 60 days            
Residential | Construction              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for loan losses $ 576,000 609,000   199,000 168,000 191,000 148,000
Loan maturities 1 year            
Residential | Construction | Cumulative Effect, Period of Adoption, Adjustment              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for loan losses       735,000      
Home Equity              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for loan losses $ 617,000 635,000   1,029,000 993,000 966,000 925,000
Loan maturities 300 months            
Loan to value ratio 0.80            
Home Equity | Cumulative Effect, Period of Adoption, Adjustment              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for loan losses       (456,000)      
Consumer              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for loan losses $ 251,000 $ 278,000   1,062,000 $ 872,000 $ 866,000 $ 833,000
Delinquent period before consumer loans are charged off 120 days            
Consumer | Cumulative Effect, Period of Adoption, Adjustment              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Allowance for loan losses       $ (802,000)