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Debt (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Mar. 17, 2020
Debt            
Outstanding amount $ 30,000,000   $ 30,000,000   $ 30,000,000  
Advance term     5 years      
Residential mortgage backed securities, fair value 32,726,000   $ 32,726,000      
Interest Expense, Borrowings 109,000 $ 107,000 216,000 $ 214,000    
Obligations of states and political subdivisions            
Debt            
Residential mortgage backed securities, fair value $ 32,726,000   $ 32,726,000      
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 $ 30,000,000 $ 30,000,000 $ 30,000,000 $ 30,000,000    
Maximum borrowing capacity 50,000,000   50,000,000      
Default trigger, principal amount 10,000,000   10,000,000      
Outstanding amount 0   $ 0   $ 0  
Commitment fee (as a percent)     0.25% 0.25%    
F H L B Boston            
Debt            
Outstanding amount           $ 30,000,000
Maximum borrowing capacity using eligible invested assets as collateral $ 193,710,000   $ 193,710,000