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Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Mar. 17, 2020
Debt        
Outstanding amount $ 30,000   $ 30,000  
Advance term 5 years      
Residential mortgage backed securities, fair value $ 35,899      
Interest Expense, Borrowings $ 107 $ 107    
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       $ 30,000
Maximum borrowing capacity using eligible invested assets as collateral $ 197,260