Historical Loss and LAE Development - Reconciliation of Unpaid Losses and Settlement Expenses (LAE) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Unpaid losses and LAE at beginning of year
Gross	$ 2,446,025	$ 2,315,637	$ 2,043,555
Ceded	(757,349)	(740,089)	(608,086)
Net	1,688,676	1,575,548	1,435,469
Increase (decrease) in incurred losses and LAE
Current accident year	834,562	712,960	636,955
Prior accident year	(95,309)	(108,547)	(122,579)
Total incurred	739,253	604,413	514,376
Loss and LAE payments for claims incurred
Current accident year	(121,314)	(165,364)	(97,525)
Prior accident years	(368,570)	(325,921)	(276,772)
Total paid	(489,884)	(491,285)	(374,297)
Net unpaid losses and LAE at end of year	1,938,045	1,688,676	1,575,548
Unpaid losses and LAE at end of year
Gross	2,693,470	2,446,025	2,315,637
Ceded	(755,425)	(757,349)	(740,089)
Net unpaid losses and LAE at end of year	$ 1,938,045	$ 1,688,676	$ 1,575,548