Reinsurance - Schedule of Net Reinsurance Balances Recoverable, After Consideration of Collateral, from Top Reinsurers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 808,017
Ceded Premiums Written	$ 378,913	$ 323,950	$ 289,821
Percent of Total Ceded Premium Written	100.00%
Reinsurance balances recoverable as a percentage of shareholder's equity, threshold for disclosure	2.00%
Reinsurer Concentration Risk | Reinsurance Recoverable
Ceded Credit Risk [Line Items]
Percent of Total Net Reinsurer Exposure	100.00%
Munich Re / HSB | AM Best Rating, A+, Superior | S&P Rating, AA-, Very Strong
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 105,823
Ceded Premiums Written	$ 35,989
Percent of Total Ceded Premium Written	9.50%
Munich Re / HSB | Reinsurer Concentration Risk | AM Best Rating, A+, Superior | Reinsurance Recoverable | S&P Rating, AA-, Very Strong
Ceded Credit Risk [Line Items]
Percent of Total Net Reinsurer Exposure	13.10%
Renaissance Re | AM Best Rating, A+, Superior | S&P Rating, A+, Strong
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 77,488
Ceded Premiums Written	$ 21,868
Percent of Total Ceded Premium Written	5.80%
Renaissance Re | Reinsurer Concentration Risk | AM Best Rating, A+, Superior | Reinsurance Recoverable | S&P Rating, A+, Strong
Ceded Credit Risk [Line Items]
Percent of Total Net Reinsurer Exposure	9.60%
Nationwide Mutual | AM Best Rating, A, Excellent | S&P Rating, A+, Strong
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 50,172
Ceded Premiums Written	$ 20,412
Percent of Total Ceded Premium Written	5.40%
Nationwide Mutual | Reinsurer Concentration Risk | AM Best Rating, A, Excellent | Reinsurance Recoverable | S&P Rating, A+, Strong
Ceded Credit Risk [Line Items]
Percent of Total Net Reinsurer Exposure	6.20%
Partner Re | AM Best Rating, A+, Superior | S&P Rating, A+, Strong
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 43,389
Ceded Premiums Written	$ 27,746
Percent of Total Ceded Premium Written	7.30%
Partner Re | Reinsurer Concentration Risk | AM Best Rating, A+, Superior | Reinsurance Recoverable | S&P Rating, A+, Strong
Ceded Credit Risk [Line Items]
Percent of Total Net Reinsurer Exposure	5.40%
Safety National | AM Best Rating, A++, Superior | S&P Rating, A+, Strong
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 38,897
Ceded Premiums Written	$ 6,734
Percent of Total Ceded Premium Written	1.80%
Safety National | Reinsurer Concentration Risk | AM Best Rating, A++, Superior | Reinsurance Recoverable | S&P Rating, A+, Strong
Ceded Credit Risk [Line Items]
Percent of Total Net Reinsurer Exposure	4.80%
Lloyds of London | AM Best Rating, A, Excellent | S&P Rating, AA-, Very Strong
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 33,622
Ceded Premiums Written	$ 37,927
Percent of Total Ceded Premium Written	10.00%
Lloyds of London | Reinsurer Concentration Risk | AM Best Rating, A, Excellent | Reinsurance Recoverable | S&P Rating, AA-, Very Strong
Ceded Credit Risk [Line Items]
Percent of Total Net Reinsurer Exposure	4.20%
Berkley Insurance Co. | AM Best Rating, A+, Superior | S&P Rating, A+, Strong
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 33,575
Ceded Premiums Written	$ 7,610
Percent of Total Ceded Premium Written	2.00%
Berkley Insurance Co. | Reinsurer Concentration Risk | AM Best Rating, A+, Superior | Reinsurance Recoverable | S&P Rating, A+, Strong
Ceded Credit Risk [Line Items]
Percent of Total Net Reinsurer Exposure	4.20%
Aspen UK Ltd. | AM Best Rating, A, Excellent | S&P Rating, A-, Strong
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 33,327
Ceded Premiums Written	$ 350
Percent of Total Ceded Premium Written	0.10%
Aspen UK Ltd. | Reinsurer Concentration Risk | AM Best Rating, A, Excellent | Reinsurance Recoverable | S&P Rating, A-, Strong
Ceded Credit Risk [Line Items]
Percent of Total Net Reinsurer Exposure	4.10%
Endurance Re | AM Best Rating, A+, Superior | S&P Rating, A+, Strong
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 33,220
Ceded Premiums Written	$ 4,142
Percent of Total Ceded Premium Written	1.10%
Endurance Re | Reinsurer Concentration Risk | AM Best Rating, A+, Superior | Reinsurance Recoverable | S&P Rating, A+, Strong
Ceded Credit Risk [Line Items]
Percent of Total Net Reinsurer Exposure	4.10%
Hannover Ruckversicherung | AM Best Rating, A+, Superior | S&P Rating, AA-, Very Strong
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 30,340
Ceded Premiums Written	$ 17,856
Percent of Total Ceded Premium Written	4.70%
Hannover Ruckversicherung | Reinsurer Concentration Risk | AM Best Rating, A+, Superior | Reinsurance Recoverable | S&P Rating, AA-, Very Strong
Ceded Credit Risk [Line Items]
Percent of Total Net Reinsurer Exposure	3.70%
Toa Re | AM Best Rating, A, Excellent | S&P Rating, A+, Strong
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 29,585
Ceded Premiums Written	$ 11,232
Percent of Total Ceded Premium Written	3.00%
Toa Re | Reinsurer Concentration Risk | AM Best Rating, A, Excellent | Reinsurance Recoverable | S&P Rating, A+, Strong
Ceded Credit Risk [Line Items]
Percent of Total Net Reinsurer Exposure	3.70%
All Other Reinsurers
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 298,579
Ceded Premiums Written	$ 187,047
Percent of Total Ceded Premium Written	49.30%
All Other Reinsurers | Reinsurer Concentration Risk | Reinsurance Recoverable
Ceded Credit Risk [Line Items]
Percent of Total Net Reinsurer Exposure	36.90%