QUARTERLY RESULTS OF OPERATIONS - (Summary of Unaudited Quarterly Results of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	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
Quarterly Financial Information Disclosure [Abstract]
Net premiums earned	$ 91,098	$ 98,493	$ 83,557	$ 82,109	$ 87,503	$ 80,764	$ 83,554	$ 81,660	$ 355,257	$ 333,481	$ 261,369
Total Revenue	96,442	110,832	95,742	93,077	101,752	98,697	98,159	93,054	396,093	391,662	307,525
Loss and loss adjustment expense reserves	72,318	62,457	47,570	46,071	58,874	75,367	56,417	56,899	65,715	72,405	60,404
Total costs and expenses	108,836	99,862	83,726	83,461	92,185	108,876	92,504	89,170	375,885	382,735	305,722
Net (loss) income attributable to Federated National 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
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