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Allowance for Loan Losses - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
loan_class
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of related loans 0.80% 0.48%    
Increase (decrease) in qualitative portion $ 5,534      
Allowance for loan losses $ 16,253 $ 11,639 $ 11,232 $ 10,729
Allowance for loan losses as a percent of total loans 1.10% 0.90%    
Allowance for loan losses as a percent of total loans, excluding PPP loan balances 1.15%      
Number of commercial loan classes | loan_class 3      
Loan-to-value percent, commercial real estate 80.00%      
Number of residential loan classes | loan_class 2      
Construction loans, percent of capital 37.70%      
Construction loans, maximum percent of capital 100.00%      
Construction loans and non-owner-occupied commercial real estate loans, percent of capital 147.10%      
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%      
Residential loans, loan to value percent minimum 75.00%      
Residential loans, loan to value percent, maximum 80.00%      
Consumer loans, loan to value percent, minimum 80.00%      
Consumer loans, loan to value percent, maximum 90.00%      
Commercial | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ 662 $ 365 255 434
Loan maturities 2 years      
Home equity line of credit        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ 1,211 1,078 730 692
Loan maturities 300 months      
Loan to value ratio 0.80      
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 $ 102 25 34 36
Loan maturities 1 year      
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ 778 867 $ 630 $ 545
Delinquent period before consumer loans are charged off 120 days      
Unallocated Reserves        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ 2,134 $ 1,182    
Percent of total allowance reserve 13.10% 10.20%    
Unallocated Reserves | Commercial | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ 0 $ 0    
Unallocated Reserves | Home equity line of credit        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses 0 0    
Unallocated Reserves | Residential | Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses 0 0    
Unallocated Reserves | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ 0 $ 0