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Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Amortized cost    
Due in one year or less $ 7,298 $ 11,214
Due after one year through five years 30,193 23,348
Due after five years through ten years 1,000 1,000
Amortized Cost, Total 38,491 35,562
Fair value    
Due in one year or less 7,356 11,283
Due after one year through five years 30,011 23,976
Due after five years through ten years 959 995
Fair Value, Total $ 38,326 $ 36,254