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Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 10, 2023
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Jul. 29, 2023
Mar. 07, 2023
Dec. 29, 2022
Mar. 17, 2020
Debt                
Interest Expense, Borrowings   $ 108 $ 155          
Residential mortgage-backed securities                
Debt                
Fair value of loan   51,180   $ 53,503        
Revolving Credit Agreement                
Debt                
Current borrowing capacity $ 30,000              
Variable interest rate basis SOFR              
Revolving Credit Agreement | Prime rate                
Debt                
Variable interest rate basis prime rate              
Revolving Credit Agreement | Federal Funds Effective Swap Rate                
Debt                
Spread on variable rate (as a percent) 1.25%              
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)   0.20% 0.25%          
RBS Citizens | Revolving Credit Agreement | Federal Funds Effective Swap Rate                
Debt                
Additional spread on variable rate (as a percent) 0.50%              
F H L B Boston                
Debt                
Outstanding amount         $ 5,000 $ 15,000 $ 5,000 $ 30,000
Maximum borrowing capacity using eligible invested assets as collateral   $ 195,273            
Advance term         7 days 1 month 1 month 5 years
F H L B Boston | Interest-bearing FHLB                
Debt                
Interest rate percentage         5.20% 4.92% 4.34% 1.42%
Level 2 Inputs | F H L B Boston                
Debt                
Fair value of loan   $ 30,381   $ 30,468