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Risks and Uncertainties (Narrative) (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
USD ($)
customer
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Unusual Risk or Uncertainty [Line Items]      
Additional borrowing capacity of Federal Home Loan Bank of Boston and the Federal Reserve Bank of Boston $ 239,200    
Securities Portfolio, Percent Of Total Assets 1.60%    
Percent of customers' deposits insured by FDIC 52.60%    
Percent of customers' deposits insured by DIF 47.40%    
Accumulated other comprehensive loss $ 1,891 $ 2,200  
Accumulated other comprehensive loss, percent 0.90%    
Total loans ending balance $ 1,357,545 1,444,116  
Other Repossessed Assets 6,051
Nonaccrual Loans 21,669 26,964  
Digital Asset [Member]      
Unusual Risk or Uncertainty [Line Items]      
Financing receivable, allowance for credit losses, individually evaluated for impairment 7,200    
Total loans ending balance $ 16,800    
Number of customers | customer 1    
Commercial [Member]      
Unusual Risk or Uncertainty [Line Items]      
Total loans ending balance $ 187,965 216,931  
Nonaccrual Loans 70 $ 101  
Term Extension [Member] | Digital Asset [Member]      
Unusual Risk or Uncertainty [Line Items]      
Nonaccrual Loans $ 16,800