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Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investment Company, Financial Highlights [Line Items]                      
Revenues $ 66,849 $ 59,390 $ 58,527 $ 55,914 $ 67,257 $ 56,176 $ 53,734 $ 55,357 $ 240,680 $ 232,524 $ 250,546
Benefits and expenses 58,075 54,749 52,483 49,199 55,846 51,354 49,768 48,179 214,506 205,147 220,041
Federal income tax expense (benefit) (1,967) 1,943 (82) 1,843 (2,248) 1,415 1,474 729 1,737 1,370 (42,201)
Net income (loss) 10,741 2,698 6,126 4,872 13,659 3,407 2,492 6,449 $ 24,437 $ 26,007 $ 72,706
Common Stock [Member]                      
Investment Company, Financial Highlights [Line Items]                      
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 10,741 $ 2,698 $ 6,126 $ 4,872 $ 13,659 $ 3,407 $ 2,492 $ 6,449      
Common Stock Class A [Member]                      
Investment Company, Financial Highlights [Line Items]                      
Earnings Per Share, Basic $ 0.21 $ 0.06 $ 0.12 $ 0.10 $ 0.27 $ 0.07 $ 0.05 $ 0.13 $ 0.49 $ 0.52 $ 1.46
Earnings Per Share, Diluted $ 0.21 $ 0.05 $ 0.12 $ 0.10 $ 0.27 $ 0.06 $ 0.05 $ 0.13 0.48 0.51 1.44
Common Stock Class B [Member]                      
Investment Company, Financial Highlights [Line Items]                      
Earnings Per Share, Basic                 0 0 0.73
Earnings Per Share, Diluted                 $ 0 $ 0 $ 0.72