REINSURANCE - (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 01, 2018	Jul. 31, 2017	Jul. 31, 2016	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Jul. 01, 2017	Jul. 01, 2016
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				$ 63,599		$ 63,599	$ 71,944
Reinsurance recoverable				211,424		211,424	124,601
FNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				174,400		174,400
Federated Nationals Insurance Company Non Florida Reinsurance Program 2017-2018 [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				1,700		1,700
Federated Nationals Insurance Company Non Florida Reinsurance Program 2017-2018 [Member] | Maximum [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				21,000		21,000
MNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				5,000		$ 5,000
Quota Share Treaties [Member] | Private Passenger Automobile Insurance Product Line [Member]
Liability for Catastrophe Claims [Line Items]
Percentage of quota share reinsurance treaty						75.00%
Federated National 2018-2019 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				148,800		$ 148,800
Federated National 2018-2019 Reinsurance Programs [Member] | Maximum [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				20,000		20,000
Multiple Year Protection Terminated [Member] | Maximum [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				89,000		89,000
Multiple Year Protection Plan Expired [Member] | Maximum [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				156,000		156,000
Federated Nationals Insurance Company Non Florida Reinsurance Program 2018-2019 [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				2,000		2,000
Federated Nationals Insurance Company Non Florida Reinsurance Program 2018-2019 [Member] | Maximum [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				23,000		23,000
Federated National's Florida [Member] | FNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				124,000		124,000
Amount Of Private Market Excess Of Loss Treaties				25,100		25,100
FHCF [Member] | FNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				50,400		$ 50,400
Percentage of quota share reinsurance treaty						75.00%
FHCF [Member] | MNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				1,800		$ 1,800
Private and FHCF Reinsurance [Member] | FNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Liability for catastrophe claims, carrying amount				2,200,000		2,200,000
Maximum single event coverage				1,500,000		1,500,000
Private and FHCF Reinsurance [Member] | MNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Liability for catastrophe claims, carrying amount				109,000		109,000
Maximum single event coverage				68,100		$ 68,100
Percentage of quota share reinsurance treaty						75.00%
FNIC [Member]
Liability for Catastrophe Claims [Line Items]
Trust agreement for loss exposure (less than for 2018)				$ 100		$ 100	2,600
FNIC [Member] | FNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Reinsurance Retention Policy, Excess Retention, Amount Reinsured						18,000
FNIC [Member] | Private Market Excess Of Loss Treaties [Member] | Minimum [Member]
Liability for Catastrophe Claims [Line Items]
Payments for Reinsurance						7,100
Reinsurance Prepaid Automatic Reinstatement Protection Amount						$ 18,000
FNIC [Member] | Quota Share One [Member] | Florida Homeowners Book Of Business [Member]
Liability for Catastrophe Claims [Line Items]
Percentage of quota share reinsurance treaty	2.00%			10.00%	2.00%	30.00%
FNIC [Member] | Quota Share One [Member] | Property Insurance Product Line [Member]
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share expired on cut off basis								10.00%
FNIC [Member] | Quota Share Two [Member] | Florida Homeowners Book Of Business [Member]
Liability for Catastrophe Claims [Line Items]
Percentage of quota share reinsurance treaty					10.00%	10.00%
Monarch National S Florida [Member] | Private Market Excess Of Loss Treaties [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				$ 3,400		$ 3,400
Monarch National S Florida [Member] | MNIC’s 2016-2017 Catastrophe Reinsurance Program [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				3,200		3,200
Florida [Member] | Quota Share Treaties [Member] | Property Insurance Product Line [Member]
Liability for Catastrophe Claims [Line Items]
Percentage of quota share reinsurance treaty		10.00%	30.00%
Florida [Member] | Quota Share One [Member] | Property Insurance Product Line [Member]
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share expired on cut off basis									30.00%
Percentage of unearned premiums and losses retained									30.00%
Florida [Member] | Federated National's Florida [Member] | Federated National 2018-2019 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				102,700		102,700
Florida [Member] | FHCF [Member] | Federated National 2018-2019 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				46,100		$ 46,100
Percentage of quota share reinsurance treaty						75.00%
Florida [Member] | Private and FHCF Reinsurance [Member] | Federated National 2018-2019 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Liability for catastrophe claims, carrying amount				1,800,000		$ 1,800,000
Maximum single event coverage				1,300,000		$ 1,300,000
Florida [Member] | FNIC [Member] | Quota Share Treaties [Member] | Property Insurance Product Line [Member]
Liability for Catastrophe Claims [Line Items]
Percentage of quota share reinsurance treaty						40.00%
Number of quota share treaties						2 years
Hurricane Michael and Irma [Member] | Maximum [Member]
Liability for Catastrophe Claims [Line Items]
Reinsurance recoverable				183,500		$ 183,500	$ 88,000
Second Event Coverage [Member] | Federated Nationals Insurance Company Non Florida Reinsurance Program 2017-2018 [Member]
Liability for Catastrophe Claims [Line Items]
Reinsurance Retention Policy, Amount Retained						2,000
Reinsurance Amount Retained On Net Basis With Profit Share Agreement						1,000
Second Event Coverage [Member] | Federated Nationals Insurance Company Non Florida Reinsurance Program 2017-2018 [Member] | Maximum [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				16,000		16,000
Second Event Coverage [Member] | Federated Nationals Insurance Company Non Florida Reinsurance Program 2018-2019 [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				13,000		13,000
Reinsurance Retention Policy, Amount Retained						2,000
Reinsurance Amount Retained On Net Basis With Profit Share Agreement						1,000
Second Event Coverage [Member] | Federated Nationals Insurance Company Non Florida Reinsurance Program 2018-2019 [Member] | Maximum [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				18,000		18,000
First Event Coverage [Member] | Federated Nationals Insurance Company Non Florida Reinsurance Program 2017-2018 [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				5,000		5,000
Reinsurance Retention Policy, Amount Retained						13,000
Reinsurance Amount Retained On Net Basis With Profit Share Agreement						6,500
First Event Coverage [Member] | Federated National 2018-2019 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				3,000		3,000
First Event Coverage [Member] | Federated Nationals Insurance Company Non Florida Reinsurance Program 2018-2019 [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				5,000		5,000
Reinsurance Retention Policy, Amount Retained						15,000
Reinsurance Amount Retained On Net Basis With Profit Share Agreement						7,500
Renewing Multiple Year Protection From Last Year [Member] | Florida And Non Florida Exposures [Member] | Private Market Excess Of Loss Treaties [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				156,000		156,000
New Multiple Year Protection This Year [Member] | Florida And Non Florida Exposures [Member] | Private Market Excess Of Loss Treaties [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				$ 89,000		$ 89,000