LOSS AND LOSS ADJUSTMENT RESERVES - (Schedule of Activity in Liability for Loss and LAE Reserves) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves, beginning-of-period	$ 540,367	$ 324,362	$ 296,230
Less: reinsurance recoverable	(358,128)	(164,429)	(166,396)
Net reserves, beginning-of-period	182,239	159,933	129,834
Net reserves from the Maison Companies acquisition	0	0	11,825
Incurred loss, net of reinsurance, related to:
Current year	226,537	358,952	262,118
Prior year loss development	6,305	18,367	13,460
Ceded losses under retrospectively rated quota-share	(68)	(816)	(2,489)
Prior years	6,237	17,551	10,971
Amortization of acquisition fair value adjustment	(14)	(54)	(9)
Total incurred loss and LAE, net of reinsurance	232,760	376,449	273,080
Paid loss, net of reinsurance, related to:
Current year	105,017	253,344	173,313
Prior years	125,295	100,799	81,493
Total paid loss and LAE, net of reinsurance	230,312	354,143	254,806
Net reserves, end-of-period	184,687	182,239	159,933
Plus: reinsurance recoverable	554,107	358,128	164,429
Gross reserves, end-of-period	$ 738,794	$ 540,367	$ 324,362