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Segment Information - Summary of Financial Data by Segment (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Premiums earned:                      
Premiums earned $ 189,420,787 $ 189,821,058 $ 188,763,313 $ 188,073,242 $ 186,150,478 $ 187,661,705 $ 185,714,110 $ 181,764,580 $ 756,078,400 $ 741,290,873 $ 702,514,755
Net investment income                 29,514,955 26,907,656 23,527,304
Investment gains (losses)                 21,984,617 (4,801,509) 5,705,255
Equity in earnings of DFSC                 295,000 2,693,962 1,621,605
Other                 4,578,000 5,737,000 5,658,000
Total revenues $ 200,938,743 $ 198,009,900 $ 198,788,954 $ 214,713,874 $ 186,805,834 $ 199,904,180 $ 195,790,028 $ 189,328,278 812,451,471 771,828,320 739,026,537
Underwriting income (loss):                      
SAP underwriting income (loss)                 6,787,000 (75,649,000) (25,779,000)
GAAP adjustments                 (3,079,000) 894,000 4,408,000
GAAP underwriting income (loss)                 3,708,000 (74,755,000) (21,371,000)
Net investment income                 29,514,955 26,907,656 23,527,304
Investment gains (losses)                 21,984,617 (4,801,509) 5,705,255
Equity in earnings of DFSC                 295,000 2,693,962 1,621,605
Other                 1,578,000 1,718,000 2,631,000
Income (loss) before income tax expense (benefit)                 57,081,030 (48,236,849) 12,114,462
Commercial Lines [Member]                      
Premiums earned:                      
Premiums earned                 385,465,000 337,924,000 318,391,000
Underwriting income (loss):                      
SAP underwriting income (loss)                 8,404,000 (22,059,000) 13,263,000
Personal Lines [Member]                      
Premiums earned:                      
Premiums earned                 370,613,000 403,367,000 384,124,000
Underwriting income (loss):                      
SAP underwriting income (loss)                 $ (1,617,000) $ (53,590,000) $ (39,042,000)