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Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Mar. 17, 2020
Debt            
Outstanding amount $ 30,000   $ 30,000   $ 30,000  
Advance term     5 years      
Residential mortgage backed securities, fair value 41,194   $ 41,194      
Interest Expense, Borrowings $ 109 $ 109 $ 325 $ 323    
Interest-bearing FHLB            
Debt            
Interest rate percentage 1.42%   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%   0.50%      
RBS Citizens | Revolving Credit Agreement            
Debt            
Current borrowing capacity $ 30,000 $ 30,000 $ 30,000 $ 30,000    
Maximum borrowing capacity 50,000   50,000      
Default trigger, principal amount 10,000   10,000      
Outstanding amount 0   $ 0   0  
Commitment fee (as a percent)     0.25% 0.25%    
F H L B Boston            
Debt            
Outstanding amount           $ 30,000
Maximum borrowing capacity using eligible invested assets as collateral 190,689   $ 190,689      
F H L B Boston | Residential mortgage-backed securities            
Debt            
Fair value of loan 41,194   41,194   40,398  
Level 2 Inputs | F H L B Boston            
Debt            
Fair value of loan $ 30,863   $ 30,863   $ 31,061