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Allowance for Loan Losses - Narrative (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
loan_class
Dec. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of loan classes | loan_class 8          
Percent of related loans 0.82% 0.80%        
Increase (decrease) in qualitative portion $ 1,539          
Allowance for loan losses $ 17,507 $ 16,253 $ 17,034 $ 15,371 $ 14,110 $ 11,639
Allowance for loan losses as a percent of total loans 1.08% 1.10%   1.07%    
Number of classes in the commercial loan portfolio | loan_class 3          
Loan-to-value percent, commercial real estate 80.00%          
Number of classes in the residential loan portfolio | loan_class 2          
Construction loans, percent of capital 45.40%          
Construction loans, maximum percent of capital 100.00%          
Construction loans and non-owner-occupied commercial real estate loans, percent of capital 191.70%          
Construction loans and non-owner-occupied commercial real estate loans, maximum percent of capital 300.00%          
Outstanding loans and commitments subject by independent consulting firm 60.00%          
Minimum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Residential loans, loan to value percent, maximum 75.00%          
Consumer loans, loan to value percent, minimum 80.00%          
Maximum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Residential loans, loan to value percent, maximum 80.00%          
Consumer loans, loan to value percent, minimum 90.00%          
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 867 $ 778 892 $ 592 658 867
Delinquent period before consumer loans are charged off 120 days          
Residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loan to value ratio 0.80          
Amortization term (in years) 30 years          
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 $ 142 102 160 81 64 25
Loan maturities 1 year          
Home equity line of credit            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 956 1,211 959 1,457 1,284 1,078
Loan maturities 300 months          
Loan to value ratio 0.80          
Commercial |    Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 879 662 $ 750 607 $ 524 $ 365
Loan maturities 2 years          
Unallocated Reserves            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 1,487 $ 2,134   1,576    
Percent of total allowance reserve 8.50% 13.10%        
Unallocated Reserves | Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 0 $ 0   0    
Unallocated Reserves | Residential |    Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses 0 0   0    
Unallocated Reserves | Home equity line of credit            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses 0 0   0    
Unallocated Reserves | Commercial |    Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 0 $ 0   $ 0