Segment Information - Summary of Financial Data by Segment (Detail) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
|
| Premiums earned: | ||||
| Premiums earned | $ 189,821,058 | $ 187,661,705 | $ 566,657,613 | $ 555,140,395 |
| Net investment income | 7,389,749 | 6,620,491 | 21,727,904 | 19,341,012 |
| Investment (losses) gains | (369,041) | 3,463,504 | 19,294,229 | 4,062,475 |
| Equity in earnings of DFSC | 732,768 | 295,000 | 2,152,738 | |
| Other | 1,168,000 | 1,426,000 | 3,538,000 | 4,326,000 |
| Total revenues | 198,009,900 | 199,904,180 | 611,512,728 | 585,022,486 |
| Underwriting income (loss): | ||||
| SAP underwriting income (loss) | (791,000) | (10,085,000) | (5,131,000) | (60,293,000) |
| GAAP adjustments | (399,000) | 332,000 | 1,431,000 | 5,106,000 |
| GAAP underwriting income (loss) | (1,190,000) | (9,753,000) | (3,700,000) | (55,187,000) |
| Net investment income | 7,389,749 | 6,620,491 | 21,727,904 | 19,341,012 |
| Investment (losses) gains | (369,041) | 3,463,504 | 19,294,229 | 4,062,475 |
| Equity in earnings of DFSC | 732,768 | 295,000 | 2,152,738 | |
| Other | 474,000 | 213,000 | 1,070,000 | 1,040,000 |
| Income (loss) before income tax expense (benefit) | 6,304,884 | 1,276,986 | 38,687,439 | (28,591,231) |
| Commercial Lines [Member] | ||||
| Premiums earned: | ||||
| Premiums earned | 98,324,000 | 84,251,000 | 284,593,000 | 251,029,000 |
| Underwriting income (loss): | ||||
| SAP underwriting income (loss) | 2,521,000 | 2,125,000 | 4,946,000 | (17,935,000) |
| Personal Lines [Member] | ||||
| Premiums earned: | ||||
| Premiums earned | 91,497,000 | 103,410,000 | 282,065,000 | 304,111,000 |
| Underwriting income (loss): | ||||
| SAP underwriting income (loss) | $ (3,312,000) | $ (12,210,000) | $ (10,077,000) | $ (42,358,000) |