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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net Investment Income [Line Items]      
Investment income $ 2,413 $ 3,571 $ 4,315
Investment expenses (445) (415) (284)
Net investment income 1,968 3,156 4,031
Debt securities      
Net Investment Income [Line Items]      
Investment income 2,217 3,213 3,476
Equity securities      
Net Investment Income [Line Items]      
Investment income 194 220 352
Cash, cash equivalents and short-term investments      
Net Investment Income [Line Items]      
Investment income $ 2 $ 138 $ 487