Segment Information, Financial Data by Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Premiums earned [Abstract]
Premiums earned	$ 822,489,450	$ 776,015,201	$ 742,040,339
Net investment income	34,016,112	31,125,631	29,504,466
Investment (losses) gains	(10,184,797)	6,477,286	2,777,919
Total revenues	848,220,546	816,465,791	777,819,910
Underwriting (loss) income [Abstract]
Net investment income	34,016,112	31,125,631	29,504,466
Investment (losses) gains	(10,184,797)	6,477,286	2,777,919
(Loss) income before income tax (benefit) expense	(3,638,099)	30,338,508	63,272,503
Operating Segments [Member]
Premiums earned [Abstract]
Premiums earned	822,490,000	776,015,000	742,040,000
Net investment income	34,016,000	31,126,000	29,504,000
Investment (losses) gains	(10,185,000)	6,477,000	2,778,000
Other	1,900,000	2,848,000	3,497,000
Total revenues	848,221,000	816,466,000	777,819,000
Underwriting (loss) income [Abstract]
SAP underwriting (loss) income	(36,171,000)	(17,939,000)	30,906,000
GAAP adjustments	8,667,000	9,945,000	(959,000)
GAAP underwriting (loss) income	(27,504,000)	(7,994,000)	29,947,000
Net investment income	34,016,000	31,126,000	29,504,000
Investment (losses) gains	(10,185,000)	6,477,000	2,778,000
Other	35,000	730,000	1,043,000
(Loss) income before income tax (benefit) expense	(3,638,000)	30,339,000	63,272,000
Commercial Lines [Member] | Operating Segments [Member]
Premiums earned [Abstract]
Premiums earned	510,153,000	468,433,000	412,877,000
Underwriting (loss) income [Abstract]
SAP underwriting (loss) income	(22,665,000)	(35,174,000)	(858,000)
Personal Lines [Member] | Operating Segments [Member]
Premiums earned [Abstract]
Premiums earned	312,337,000	307,582,000	329,163,000
Underwriting (loss) income [Abstract]
SAP underwriting (loss) income	$ (13,506,000)	$ 17,235,000	$ 31,764,000