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Loans (Additional Information) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
loan
Sep. 30, 2020
USD ($)
loan
Sep. 30, 2019
loan
Oct. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest income on non-accrual loans $ 1,000   $ 17,000      
Troubled debt restructurings 113,000   113,000      
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      
PPP            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Amount of PPP loans guaranteed by SBA $ 351,300,000   $ 351,300,000      
Number of PPP loans guaranteed by SBA | loan 3,070   3,070      
SBA | Subsequent Event            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Amount of PPP loans guaranteed by SBA         $ 113,000,000  
Number of PPP loans guaranteed by SBA | loan         603