Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Earnings (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Net investment income									$ 12,460	$ 10,254	$ 9,063
Net realized and unrealized investment gains (losses)									(4,144)	8,548	3,045
Total revenues	$ 96,442	$ 110,832	$ 95,742	$ 93,077	$ 101,752	$ 98,697	$ 98,159	$ 93,054	396,093	391,662	307,525
Costs and expenses [Abstract]
General and administrative expenses									22,183	19,963	17,186
Interest expense									4,177	348	348
Total costs and expenses	108,836	99,862	83,726	83,461	92,185	108,876	92,504	89,170	375,885	382,735	305,722
Income (loss) before income taxes									20,208	8,927	1,803
Income tax expense (benefit)									5,498	3,585	542
Net income (loss)									14,710	5,342	1,261
Net income (loss) attributable to non-controlling interest									(218)	(2,647)	246
Net income (loss) attributable to FedNat Holding Company shareholders	$ (9,305)	$ 7,950	$ 8,820	$ 7,463	$ 6,296	$ (4,724)	$ 3,995	$ 2,422	14,928	7,989	1,015
Parent Company [Member]
Revenues:
Management Fees Revenue									2,608	2,611	2,492
Net investment income									843	501	623
Net realized and unrealized investment gains (losses)									(765)	0	0
Equity in income of consolidated subsidiaries									30,895	16,902	8,550
Total revenues									33,581	20,014	11,665
Costs and expenses [Abstract]
General and administrative expenses									9,296	11,087	9,862
Interest expense									4,077	0	0
Total costs and expenses									13,373	11,087	9,862
Income (loss) before income taxes									20,208	8,927	1,803
Income tax expense (benefit)									5,498	3,585	542
Net income (loss)									14,710	5,342	1,261
Net income (loss) attributable to non-controlling interest									(218)	(2,647)	246
Net income (loss) attributable to FedNat Holding Company shareholders									$ 14,928	$ 7,989	$ 1,015