Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Earnings (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue:
Net investment income		$ 2,603	$ 2,560	$ 2,318					$ 4,878	$ 7,481	$ 10,254	$ 9,063	$ 7,226
Total revenue	$ 101,752	98,697	98,159	93,054	$ 89,971	$ 81,758	$ 70,786	$ 65,010	191,213	289,910	391,662	307,525	243,471
Costs and expenses [Abstract]
General and administrative expenses		5,042	5,076	4,619					9,695	14,737	19,963	17,186	14,698
Total costs and expenses	92,185	108,876	92,504	89,170	103,948	78,914	71,090	51,770	181,674	290,550	382,735	305,722	180,526
Income before income taxes		(10,179)	5,655	3,884					9,539	(640)	8,927	1,803	62,945
Income taxes		(3,781)	1,988	1,435					3,423	(358)	3,585	542	24,089
Net income		(6,398)	3,667	2,449					6,116	(282)	5,342	1,261	38,856
Net (loss) income attributable to non-controlling interest		(1,674)	(328)	27					(301)	(1,975)	(2,647)	246	(445)
Net income attributable to Federated National Holding Company shareholders	$ 6,296	$ (4,724)	$ 3,995	$ 2,422	$ (8,793)	$ 2,099	$ (405)	$ 8,114	$ 6,417	$ 1,693	7,989	1,015	39,301
Parent Company [Member]
Revenue:
Management Fees Revenue											2,611	2,492	2,489
Net investment income											501	623	609
Equity in income of consolidated subsidiaries											16,902	8,550	69,657
Total revenue											20,014	11,665	72,755
Costs and expenses [Abstract]
General and administrative expenses											11,087	9,862	9,810
Total costs and expenses											11,087	9,862	9,810
Income before income taxes											8,927	1,803	62,945
Income taxes											3,585	542	24,089
Net income											5,342	1,261	38,856
Net (loss) income attributable to non-controlling interest											(2,647)	246	(445)
Net income attributable to Federated National Holding Company shareholders											$ 7,989	$ 1,015	$ 39,301