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								12 Months Ended
	Jun. 01, 2018	Oct. 31, 2018	Feb. 28, 2018	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
Earnings Per Share [Abstract]
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
Basic (in shares)												12,775	13,170	13,758
Net income (loss) per share - basic (in dollars per share)				$ (0.73)	$ 0.62	$ 0.69	$ 0.58	$ 0.48	$ (0.36)	$ 0.30	$ 0.18	$ 1.17	$ 0.61	$ 0.07
Dilutive effect of stock compensation plans												92	80	164
Diluted (in shares)												12,867	13,250	13,922
Net income per share - diluted (in dollars per share)												$ 1.16	$ 0.60	$ 0.07
Dividends declared per share of common stock (in dollars per share)	$ 0.08	$ 0.08	$ 0.08									$ 0.24	$ 0.32	$ 0.27