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Loans - TDRs by Class and Associated Specific Reserves (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 14 13
TDR recorded investment more than 30 days past due $ 1,577 $ 1,510
Number of loans placed on TDR status in previous 12 months | loan 1 2
Balance $ 1,577 $ 1,510
Specific Reserves $ 97 $ 217
Commercial | Real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 0 0
Balance $ 0 $ 0
Specific Reserves $ 0 $ 0
Commercial | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 0 0
Balance $ 0 $ 0
Specific Reserves $ 0 $ 0
Commercial | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 4 4
Balance $ 419 $ 371
Specific Reserves $ 92 $ 131
Municipal    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 0 0
Balance $ 0 $ 0
Specific Reserves $ 0 $ 0
Residential | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 0 0
Balance $ 0 $ 0
Specific Reserves $ 0 $ 0
Residential | Term    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 8 8
Balance $ 988 $ 972
Specific Reserves $ 5 $ 86
Home equity line of credit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 1 1
Balance $ 162 $ 167
Specific Reserves $ 0 $ 0
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | loan 1 0
Balance $ 8 $ 0
Specific Reserves $ 0 $ 0