Reinsurance - Reinsurance Recoverable and Ceded Premiums (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Insurance [Abstract]
Ceded unpaid losses and LAE	$ 542,884	$ 455,484	$ 438,652	$ 435,986
Ceded paid losses and LAE	131,812	122,287
Loss portfolio transfer	14,324	20,858
Allowance for credit losses	(2,295)	(2,295)
Reinsurance recoverables	686,725	596,334
Ceded unearned premium	$ 236,962	$ 186,121