Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Earnings (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Net investment income									$ 15,901	$ 12,460	$ 10,254
Net realized and unrealized investment gains (losses)									7,084	(4,144)	8,548
Total revenues	$ 108,987	$ 99,476	$ 105,301	$ 101,197	$ 96,442	$ 110,832	$ 95,742	$ 93,077	414,961	396,093	391,662
Costs and expenses [Abstract]
General and administrative expenses									23,203	22,183	19,963
Interest expense									10,776	4,177	348
Total costs and expenses	118,118	94,099	95,596	106,435	108,836	99,862	83,726	83,461	414,248	375,885	382,735
Income (loss) before income taxes									713	20,208	8,927
Income tax expense (benefit)									(298)	5,498	3,585
Net income (loss)									1,011	14,710	5,342
Net income (loss) attributable to non-controlling interest									0	(218)	(2,647)
Net income (loss) attributable to FedNat Holding Company shareholders	$ (6,893)	$ 4,659	$ 7,110	$ (3,865)	$ (9,305)	$ 7,950	$ 8,820	$ 7,463	1,011	14,928	7,989
Parent Company [Member]
Revenues:
Management fees									2,160	2,608	2,611
Interest from subsidiaries									107	0	0
Net investment income									1,757	843	501
Net realized and unrealized investment gains (losses)									448	(765)	0
Equity in income of consolidated subsidiaries									20,909	30,895	16,902
Total revenues									25,381	33,581	20,014
Costs and expenses [Abstract]
General and administrative expenses									13,892	9,296	11,087
Interest expense									10,776	4,077	0
Total costs and expenses									24,668	13,373	11,087
Income (loss) before income taxes									713	20,208	8,927
Income tax expense (benefit)									(298)	5,498	3,585
Net income (loss)									1,011	14,710	5,342
Net income (loss) attributable to non-controlling interest									0	(218)	(2,647)
Net income (loss) attributable to FedNat Holding Company shareholders									$ 1,011	$ 14,928	$ 7,989