Policy Acquisition Costs - Schedule of Policy Acquisition Costs Deferred and Amortized to Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Policy acquisition costs deferred and amortized to income
Deferred policy acquisition costs (DAC), beginning of year	$ 127,859	$ 103,553	$ 88,425
Deferred:
Direct commissions	313,675	277,553	236,145
Premium taxes	19,736	18,616	17,012
Ceding commissions	(38,809)	(39,458)	(47,592)
Net deferred	294,602	256,711	205,565
Amortized	275,895	232,405	190,437
DAC, end of year	146,566	127,859	103,553
Policy acquisition costs:
Amortized	275,895	232,405	190,437
Period costs:
Ceding commission - contingent	(11,857)	(5,882)	(4,303)
Other underwriting expenses	154,287	143,109	131,334
Total policy acquisition costs	$ 418,325	$ 369,632	$ 317,468