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Investments - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value on Fixed Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Original or amortized cost $ 327,339 $ 330,439
Gross unrealized gains 2 1
Gross unrealized losses (13,978) (15,913)
Fixed maturities 313,363 314,527
U.S. treasury bonds    
Schedule of Investments [Line Items]    
Original or amortized cost 51,030 55,647
Gross unrealized gains 2 1
Gross unrealized losses (89) (116)
Fixed maturities 50,943 55,532
U.S. agency bonds – mortgage-backed    
Schedule of Investments [Line Items]    
Original or amortized cost 37,900 38,767
Gross unrealized gains 0 0
Gross unrealized losses (3,739) (4,402)
Fixed maturities 34,161 34,365
Collateralized mortgage-backed securities    
Schedule of Investments [Line Items]    
Original or amortized cost 7,199 7,199
Gross unrealized gains 0 0
Gross unrealized losses (386) (432)
Fixed maturities 6,813 6,767
Non-U.S. government bonds    
Schedule of Investments [Line Items]    
Original or amortized cost 14,730 12,643
Gross unrealized gains 0 0
Gross unrealized losses (750) (825)
Fixed maturities 13,980 11,818
Collateralized loan obligations    
Schedule of Investments [Line Items]    
Original or amortized cost 120,466 119,120
Gross unrealized gains 0 0
Gross unrealized losses (4,805) (5,028)
Fixed maturities 115,661 114,092
Corporate bonds    
Schedule of Investments [Line Items]    
Original or amortized cost 96,014 97,063
Gross unrealized gains 0 0
Gross unrealized losses (4,209) (5,110)
Fixed maturities $ 91,805 $ 91,953