REINSURANCE (Narrative) (Details) $ in Thousands		1 Months Ended		9 Months Ended
	Jul. 01, 2017 USD ($)	Jul. 31, 2017	Jul. 31, 2016	Sep. 30, 2017 USD ($) item agreement	Dec. 31, 2016 USD ($)	Jul. 01, 2016
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				$ 126,479	$ 79,154
Reinsurance recoverable, net				338,015	48,530
Hurricane Irma [Member]
Liability for Catastrophe Claims [Line Items]
Reinsurance recoverable, net				$ 288,600
Number of reinsurers | item				2
Hurricane Irma [Member] | Reinsurance Recoverable [Member] | Reinsurer Concentration Risk [Member] | Reinsurer One [Member]
Liability for Catastrophe Claims [Line Items]
Concentration risk, percentage				11.00%
Hurricane Irma [Member] | Reinsurance Recoverable [Member] | Reinsurer Concentration Risk [Member] | Reinsurer Two [Member]
Liability for Catastrophe Claims [Line Items]
Concentration risk, percentage				19.00%
FNIC's 2016-2017 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				$ 179,500
FNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				176,900
MNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				$ 5,040
Quota Share Treaties [Member] | Private Passenger Automobile Insurance Product Line [Member]
Liability for Catastrophe Claims [Line Items]
Period of property quota share reinsurance treaty				1 year
Percentage of property quota share reinsurance treaty				75.00%
FNIC Non-Florida Reinsurance Program [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				$ 1,900
FNIC Non-Florida Reinsurance Program [Member] | First Event Coverage [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				5,000
Reinsurance retention amount				13,000
Reinsurance amount retained on net basis with profit share agreement				6,500
FNIC Non-Florida Reinsurance Program [Member] | Second Event Coverage [Member]
Liability for Catastrophe Claims [Line Items]
Reinsurance retention amount				2,000
Reinsurance amount retained on net basis with profit share agreement				1,000
FNIC Non-Florida Reinsurance Program [Member] | Maximum [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				21,000
FNIC Non-Florida Reinsurance Program [Member] | Maximum [Member] | Second Event Coverage [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount				16,000
Federated National's Florida Exposure [Member] | FNIC's 2016-2017 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				125,600
Federated National's Florida Exposure [Member] | FNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				125,100
Federated National's Florida Exposure [Member] | Private Market Excess of Loss Treaties [Member]
Liability for Catastrophe Claims [Line Items]
Amount of private market excess of loss treaties	$ 25,100
Florida And Non-Florida Exposures [Member] | Private Market Excess of Loss Treaties [Member] | New Multiple Year Protection This Year [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount	89,000
Florida And Non-Florida Exposures [Member] | Private Market Excess of Loss Treaties [Member] | Renewing Multiple Year Protection From Last Year [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount	156,000
MNIC's Florida [Member]
Liability for Catastrophe Claims [Line Items]
Trust agreement for loss exposure				300	300
MNIC's Florida [Member] | MNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				3,230
MNIC's Florida [Member] | Private Market Excess of Loss Treaties [Member]
Liability for Catastrophe Claims [Line Items]
Additional coverage amount	$ 3,400
FHCF [Member] | FNIC's 2016-2017 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				$ 53,900
Percentage of property quota share reinsurance treaty				75.00%
FHCF [Member] | FNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Amount payable under reinsurance program				$ 49,900
Percentage of property 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				$ 1,810
FNIC [Member]
Liability for Catastrophe Claims [Line Items]
Trust agreement for loss exposure				2,600	$ 2,600
FNIC [Member] | FNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Pre-tax retention amount for catastrophic event				18,000
FNIC [Member] | Quota Share Treaties [Member] | Property Insurance Product Line [Member]
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share expired on cut off basis	10.00%
Percentage of unearned premiums and losses retained	10.00%
FNIC [Member] | Quota Share Treaties [Member] | Florida Homeowners Book of Business [Member]
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty	10.00%
FNIC [Member] | Private Market Excess of Loss Treaties [Member] | Minimum [Member]
Liability for Catastrophe Claims [Line Items]
Payment made to purchase an underlying limit of protection	$ 7,100
Reinsurance prepaid automatic reinstatement protection amount acquired	$ 18,000
Private and FHCF Reinsurance [Member] | FNIC's 2016-2017 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Aggregate catastrophic losses coverage amount				2,230,000
Maximum single event coverage				1,590,000
Private and FHCF Reinsurance [Member] | FNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Aggregate catastrophic losses coverage amount				2,140,000
Maximum single event coverage				1,500,000
Private and FHCF Reinsurance [Member] | MNIC's 2017-2018 Reinsurance Programs [Member]
Liability for Catastrophe Claims [Line Items]
Aggregate catastrophic losses coverage amount				105,790
Maximum single event coverage				$ 64,860
Percentage of property quota share reinsurance treaty				75.00%
Florida [Member] | Quota Share Treaties [Member] | Property Insurance Product Line [Member]
Liability for Catastrophe Claims [Line Items]
Percentage of property 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] | FHCF [Member] | MNIC’s 2016-2017 Catastrophe Reinsurance Program [Member]
Liability for Catastrophe Claims [Line Items]
Private market term for loss treaties				13 months
Additional coverage amount				$ 3,400
Florida [Member] | FNIC [Member] | Quota Share Treaties [Member] | Property Insurance Product Line [Member]
Liability for Catastrophe Claims [Line Items]
Period of property quota share reinsurance treaty				2 years
Number of property quota share treaties | agreement				2
Percentage of property quota share reinsurance treaty				40.00%
Florida [Member] | FNIC [Member] | Quota Share One [Member] | Property Insurance Product Line [Member]
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty				30.00%
Florida [Member] | FNIC [Member] | Quota Share Two [Member] | Property Insurance Product Line [Member]
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty				10.00%
Louisiana, Texas, Alabama And South Carolina [Member] | FNIC's 2016-2017 Reinsurance Programs [Member] | Minimum [Member]
Liability for Catastrophe Claims [Line Items]
Pre-tax retention amount for catastrophic event				$ 8,000
Louisiana, Texas, Alabama And South Carolina [Member] | FNIC's 2016-2017 Reinsurance Programs [Member] | Maximum [Member]
Liability for Catastrophe Claims [Line Items]
Pre-tax retention amount for catastrophic event				$ 18,450