Segment Information - Financial Data by Segment (Details) - Operating Segments [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues:
Net premiums earned	$ 231,775	$ 234,311	$ 464,476	$ 462,060
Net investment income	12,540	11,068	24,524	22,041
Investment gains	1,544	737	1,073	2,850
Total segment revenues	245,859	246,116	490,073	486,951
Other	1,289	657	1,880	962
Total revenues	247,148	246,773	491,953	487,913
Segment expenses:
Net losses and loss expenses	151,508	166,327	283,537	319,061
Other underwriting expenses	74,900	76,521	157,895	161,385
Policyholder dividends	819	1,187	1,578	2,241
Total expenses	227,227	244,035	443,010	482,687
SAP underwriting (loss) income	4,548	(9,724)	21,466	(20,627)
GAAP adjustments	840	2,795	3,405	8,154
GAAP underwriting income (loss)	5,388	(6,929)	24,871	(12,473)
Other	952	137	1,117	(157)
Income before income tax expense	20,424	5,013	51,585	12,261
Investments [Member]
Revenues:
Net premiums earned	0	0	0	0
Net investment income	12,540	11,068	24,524	22,041
Investment gains	1,544	737	1,073	2,850
Total segment revenues	14,084	11,805	25,597	24,891
Segment expenses:
Net losses and loss expenses	0	0	0	0
Other underwriting expenses	0	0	0	0
Policyholder dividends	0	0	0	0
Total expenses	0	0	0	0
SAP underwriting (loss) income	0	0	0	0
Commercial Lines [Member]
Revenues:
Net premiums earned	138,527	134,489	274,743	266,581
Net investment income	0	0	0	0
Investment gains	0	0	0	0
Total segment revenues	138,527	134,489	274,743	266,581
Segment expenses:
Net losses and loss expenses	91,518	95,241	172,839	182,476
Other underwriting expenses	49,982	47,380	105,492	101,554
Policyholder dividends	819	1,187	1,578	2,241
Total expenses	142,319	143,808	279,909	286,271
SAP underwriting (loss) income	(3,792)	(9,319)	(5,166)	(19,690)
Personal Lines [Member]
Revenues:
Net premiums earned	93,248	99,822	189,733	195,479
Net investment income	0	0	0	0
Investment gains	0	0	0	0
Total segment revenues	93,248	99,822	189,733	195,479
Segment expenses:
Net losses and loss expenses	59,990	71,086	110,698	136,585
Other underwriting expenses	24,918	29,141	52,403	59,831
Policyholder dividends	0	0	0	0
Total expenses	84,908	100,227	163,101	196,416
SAP underwriting (loss) income	$ 8,340	$ (405)	$ 26,632	$ (937)