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Loans (Narrative) (Details)
 3 Months Ended 6 Months Ended 18 Months Ended
Jun. 30, 2021
USD ($)
loan
Jun. 30, 2020
USD ($)
loan
Jun. 30, 2021
USD ($)
loan
Jun. 30, 2020
USD ($)
loan
Jun. 30, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest income on non-accrual loans $ 29,000 $ 13,000 $ 31,000 $ 16,000    
Troubled debt restructurings 108,000   108,000   $ 108,000 $ 111,000
Additional lending amount to customers whose loan terms has been modified in troubled debt restructuring $ 0   $ 0   0 0
Number of loans modified as troubled debt restructurings | loan 0 0 0 0    
Number of loans modified as troubled debt restructuring subsequently defaulted | loan 0 0 0 0    
Threshold amount to individually classify loans by credit risk $ 250,000   $ 250,000   250,000  
PPP            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loan interest rate     1.00%      
Maturities of loans originated under first round     2 years      
Maturities of loans originated under second round     5 years      
Loans outstanding originated under first round           351,260,000
Fees on loans originated under first round           $ 12,024,000
Number of loans originated under first round | loan           3,070
Forgiven loans originated under first round 330,750,000   $ 330,750,000   330,750,000  
Net processing fees recognized on loans originated under first round         11,750,000  
Loans outstanding originated under second round 157,042,000   157,042,000   157,042,000  
Fees on loans originated during second round $ 9,022,000   $ 9,022,000   $ 9,022,000  
Number of loans originated under second round | loan 2,601   2,601   2,601  
Forgiven loans originated during second round $ 20,897,000   $ 20,897,000   $ 20,897,000  
Net processing fees recognized on loans originated under second round     2,013,000      
Loans outstanding 156,655,000   156,655,000   156,655,000  
Remaining fees on loans outstanding $ 7,283,000   $ 7,283,000   $ 7,283,000