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Loans (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 24, 2021
USD ($)
banking_office
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
Sep. 30, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest income on non-accrual loans   $ 39,000 $ 1,000 $ 71,000 $ 17,000  
Troubled debt restructurings   106,000   106,000   $ 111,000
Additional lending amount to customers whose loan terms has been modified in troubled debt restructuring   $ 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    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Brank Branches            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of branches sold | banking_office 2          
Loans included in branches sold $ 17,799,000          
Deposits included in branches sold $ 17,614,000          
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   347,556,000   $ 347,556,000    
Net processing fees recognized on loans originated under first round       11,997,000    
Loans outstanding originated under second round   157,042,000   157,042,000    
Fees on loans originated during second round   $ 9,022,000   $ 9,022,000    
Number of loans originated under second round | loan   2,601   2,601    
Forgiven loans originated during second round   $ 89,524,000   $ 89,524,000    
Net processing fees recognized on loans originated under second round       5,873,000    
Loans outstanding   71,222,000   71,222,000    
Remaining fees on loans outstanding   $ 3,175,000   $ 3,175,000