QUARTERLY RESULTS OF OPERATIONS - (Restatement Adjustments) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		1 Months Ended			3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 01, 2017	Nov. 30, 2017	Sep. 30, 2017	Jun. 30, 2017	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
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net premiums earned					$ 87,503	$ 80,764	$ 83,554	$ 81,660	$ 76,922	$ 69,405	$ 60,045	$ 54,997	$ 165,214	$ 245,978	$ 333,481	$ 261,369	$ 213,020
Net investment income						2,603	2,560	2,318					4,878	7,481	10,254	9,063	7,226
Realized Investment Gains (Losses)						6,101	2,648	(105)					2,543	8,644	8,548	3,045	3,616
Direct written policy fees						4,098	4,807	4,712					9,519	13,617	17,173	16,619	9,740
Other income						5,131	4,590	4,469					9,059	14,190	22,206	17,429	9,869
Revenues					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
Losses and loss adjustment expenses						75,367	56,417	56,899					113,316	188,683	247,557	197,810	112,710
Commissions and other underwriting expenses						28,386	30,929	27,568					58,497	86,883	114,867	90,378	52,862
General and administrative expenses						5,042	5,076	4,619					9,695	14,737	19,963	17,186	14,698
Interest expense						81	82	84					166	247	348	348	256
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 (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest						(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 (loss) (As adjusted)						(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
Basic (in dollars per share)					$ 0.48	$ (0.36)	$ 0.30	$ 0.18	$ (0.65)	$ 0.15	$ (0.03)	$ 0.59	$ 0.48	$ 0.13	$ 0.61	$ 0.07	$ 2.86
Diluted (in dollars per share)						$ (0.36)	$ 0.30	$ 0.18					$ 0.48	$ 0.13	$ 0.60	$ 0.07	$ 2.81
Basic (in shares)						13,135	13,171	13,432					13,305	13,211	13,170	13,758	13,729
Diluted (in shares)						13,135	13,256	13,559					13,405	13,302	13,250	13,922	13,997
Dividends declared per share of common stock (in dollars per share)	$ 0.08	$ 0.08	$ 0.08	$ 0.08		$ 0.08	$ 0.08	$ 0.08					$ 0.16	$ 0.24	$ 0.32	$ 0.27	$ 0.18
As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net premiums earned						$ 78,663	$ 83,159	$ 78,493	$ 75,425	$ 69,405	$ 60,045	$ 54,997	$ 161,652	$ 240,315		$ 259,872	$ 210,020
Net investment income						2,603	2,560	2,318					4,878	7,481		9,063	7,226
Realized Investment Gains (Losses)						6,101	2,648	(105)					2,543	8,644		3,045	3,616
Direct written policy fees						3,651	4,486	5,085					9,571	13,222		17,730	11,248
Other income						4,874	4,710	7,132					9,637	14,511		26,674	17,783
Revenues						95,892	97,563	92,923	88,570	83,790	75,064	68,960	188,281	284,173		316,384	249,893
Losses and loss adjustment expenses						72,935	54,956	50,831					108,722	181,657		187,341	104,353
Commissions and other underwriting expenses						29,242	30,197	32,279					57,336	86,578		108,776	64,868
General and administrative expenses						5,042	5,076	4,619					9,695	14,737		17,186	15,223
Interest expense						81	82	84					166	247		348	256
Costs and Expenses						107,300	90,311	87,813	104,590	82,250	73,249	53,562	175,919	283,219		313,651	184,700
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest						(11,408)	7,252	5,110					12,362	954		2,733	65,193
Income taxes						(4,223)	2,635	1,938					4,573	350		2,683	24,753
Net income (loss) (As adjusted)						(7,185)	4,617	3,172					7,789	604		50	40,440
Net (loss) income attributable to non-controlling interest						(1,674)	(328)	27					(301)	(1,975)		246	(445)
Net income attributable to Federated National Holding Company shareholders						$ (5,511)	$ 4,945	$ 3,145	$ (12,116)	$ 1,394	$ 991	$ 9,535	$ 8,090	$ 2,579		$ (196)	$ 40,885
Basic (in dollars per share)						$ (0.42)	$ 0.38	$ 0.23	$ (0.89)	$ 0.10	$ 0.07	$ 0.69	$ 0.61	$ 0.20		$ (0.01)	$ 2.98
Diluted (in dollars per share)						$ (0.42)	$ 0.37	$ 0.23					$ 0.60	$ 0.19		$ (0.01)	$ 2.92
Basic (in shares)						13,135	13,171	13,432					13,305	13,211		13,758	13,729
Diluted (in shares)						13,135	13,256	13,559					13,405	13,302		13,758	13,997
Dividends declared per share of common stock (in dollars per share)						$ 0.08	$ 0.08	$ 0.08					$ 0.16	$ 0.24		$ 0.27	$ 0.18