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Investments - Investment Income (Expense) Comprised Primarily of Interest and Dividends (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net Investment Income [Line Items]                      
Total investment income                 $ 15,556 $ 23,546 $ 33,821
Less: Investment expenses                 (3,021) (3,153) (3,078)
Net investment income $ 3,894 $ 2,797 $ 2,858 $ 2,986 $ 2,823 $ 4,557 $ 6,179 $ 6,834 12,535 20,393 30,743
Available-for-sale debt securities                      
Net Investment Income [Line Items]                      
Investment income                 11,926 19,091 24,989
Equity securities                      
Net Investment Income [Line Items]                      
Investment income                 2,651 2,445 2,648
Cash and Cash Equivalents                      
Net Investment Income [Line Items]                      
Investment income                 51 960 5,176
Other                      
Net Investment Income [Line Items]                      
Investment income                 $ 928 $ 1,050 $ 1,008