Reinsurance - Reinsurance Recoverable and Ceded Premiums (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Insurance [Abstract]
Ceded unpaid losses and LAE	$ 438,652			$ 435,986	$ 386,752	$ 381,338
Ceded paid losses and LAE	153,735			107,228
Loss portfolio transfer	25,583			38,145
Allowance for credit losses	(2,295)	$ (2,295)	$ (2,295)	0
Reinsurance recoverables	615,675			581,359
Ceded unearned premium	$ 218,784			$ 157,645