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Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Mar. 17, 2020
Debt      
Outstanding amount $ 30,000 $ 30,000  
Advance term 5 years    
Interest Expense, Borrowings $ 432 439  
Residential mortgage-backed securities      
Debt      
Pledged as collateral for a borrowing $ 40,398 37,467  
Interest-bearing FHLB      
Debt      
Interest rate percentage 1.42%    
Revolving Credit Agreement | LIBOR rate      
Debt      
Variable interest rate basis LIBOR    
Spread on variable rate (as a percent) 1.25%    
Revolving Credit Agreement | Prime rate      
Debt      
Variable interest rate basis prime rate    
Revolving Credit Agreement | Federal Funds Effective Swap Rate      
Debt      
Variable interest rate basis federal funds rate    
Spread on variable rate (as a percent) 1.25%    
Additional spread on variable rate (as a percent) 0.50%    
RBS Citizens | Revolving Credit Agreement      
Debt      
Current borrowing capacity $ 30,000 30,000  
Maximum borrowing capacity 50,000    
Default trigger, principal amount 10,000    
Outstanding amount $ 0 $ 0  
Commitment fee (as a percent) 0.25% 0.25%  
F H L B Boston      
Debt      
Outstanding amount     $ 30
Maximum borrowing capacity using eligible invested assets as collateral $ 211,296    
Level 2 Inputs | F H L B Boston      
Debt      
Fair value of loan $ 31,061 $ 31,291