EARNINGS PER SHARE - (Schedule of Calculation of Basic and Diluted Net Income Per Common Share) (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
Earnings Per Share [Abstract]
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 shares)						13,135	13,171	13,432					13,305	13,211	13,170	13,758	13,729
Net income (loss) per share - 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
Dilutive effect of stock compensation plans															80	164	268
Diluted (in shares)						13,135	13,256	13,559					13,405	13,302	13,250	13,922	13,997
Net income per share - diluted (in dollars per share)						$ (0.36)	$ 0.30	$ 0.18					$ 0.48	$ 0.13	$ 0.60	$ 0.07	$ 2.81
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