REINSURANCE (Narrative) (Details) - USD ($) $ in Thousands													1 Months Ended		6 Months Ended	12 Months Ended
	Mar. 01, 2021	Jan. 01, 2021	Dec. 31, 2020	Nov. 15, 2020	Nov. 04, 2020	Nov. 03, 2020	Nov. 02, 2020	Oct. 13, 2020	Sep. 03, 2020	Jul. 01, 2020	Jul. 01, 2018	Jul. 01, 2017	Jul. 31, 2017	Jul. 31, 2016	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Jul. 01, 2016
Liability for Catastrophe Claims [Line Items]
Reinsurance payable and funds withheld liabilities			$ 202,827													$ 202,827	$ 102,467
Reinsurance premium paid			413,026													413,026	209,615
Hurricane Irma
Liability for Catastrophe Claims [Line Items]
Reinsurance premium paid			304,300													304,300	163,700
Federated Nationals Insurance Company Non Florida Reinsurance Program 2018-2019 | Maximum
Liability for Catastrophe Claims [Line Items]
Reinsurance payable and funds withheld liabilities			1,800													1,800
2019-2020 Catastrophe Excess Loss Reinsurance Programs
Liability for Catastrophe Claims [Line Items]
Reinsurance payable and funds withheld liabilities			224,300													224,300
2019-2020 Catastrophe Excess Loss Reinsurance Programs | Maximum | First Event Coverage
Liability for Catastrophe Claims [Line Items]
Reinsurance retention amount																20,000
Reinsurance amount retained on net basis with profit share agreement																10,000
2019-2020 Catastrophe Excess Loss Reinsurance Programs | Maximum | Second Event Coverage
Liability for Catastrophe Claims [Line Items]
Additional coverage amount			18,000													18,000
Reinsurance retention amount																2,000
Reinsurance amount retained on net basis with profit share agreement																1,000
Combined FNIC, MIC and MNIC Twenty Twenty to Twenty Twenty-one Catastrophe Excess Loss Reinsurance Programs
Liability for Catastrophe Claims [Line Items]
Reinsurance payable and funds withheld liabilities			286,000													286,000
Combined FNIC, MIC and MNIC Twenty Twenty to Twenty Twenty-one Catastrophe Excess Loss Reinsurance Programs | Maximum | First Event Coverage
Liability for Catastrophe Claims [Line Items]
Reinsurance retention amount																18,000
Reinsurance amount retained on net basis with profit share agreement																9,000
Combined FNIC, MIC and MNIC Twenty Twenty to Twenty Twenty-one Catastrophe Excess Loss Reinsurance Programs | Maximum | Second Event Coverage
Liability for Catastrophe Claims [Line Items]
Additional coverage amount			16,000													16,000
Federated National's Florida Exposure | Combined FNIC, MIC and MNIC Twenty Twenty to Twenty Twenty-one Catastrophe Excess Loss Reinsurance Programs
Liability for Catastrophe Claims [Line Items]
Reinsurance payable and funds withheld liabilities			238,200													238,200
FHCF | 2019-2020 Catastrophe Excess Loss Reinsurance Programs
Liability for Catastrophe Claims [Line Items]
Reinsurance payable and funds withheld liabilities			45,800													$ 45,800
FHCF | 2019-2020 Catastrophe Excess Loss Reinsurance Programs | Maximum
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty																90.00%
FHCF | Combined FNIC, MIC and MNIC Twenty Twenty to Twenty Twenty-one Catastrophe Excess Loss Reinsurance Programs
Liability for Catastrophe Claims [Line Items]
Maximum single event coverage			650,000													$ 650,000
Reinsurance payable and funds withheld liabilities			47,800													$ 47,800
FNIC
Liability for Catastrophe Claims [Line Items]
Quota share reinsurance treaty, period																2 years
FNIC | Maximum
Liability for Catastrophe Claims [Line Items]
Trust agreement for loss exposure (less than)			100													$ 100	$ 100
FNIC | 2019-2020 Catastrophe Excess Loss Reinsurance Programs
Liability for Catastrophe Claims [Line Items]
Excess retention, amount reinsured																27,000
Additional coverage amount			$ 20,000													$ 20,000
FNIC | Quota Share One | Property Insurance Product Line
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share expired on cut off basis												10.00%
FNIC | Quota Share One | Florida Homeowners Book of Business
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty			10.00%	10.00%							2.00%					30.00%
FNIC | Quota Share One | Florida Homeowners Book of Business | Forecast
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty															40.00%
Percentage of quota share up for renewal															20.00%
FNIC | Quota Share One | Non-Florida Homeowners Book Of Business
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty						80.00%	50.00%
FNIC | Quota Share One | Federated Nationals Insurance Company Non Florida Reinsurance Program 2018-2019 | SageSure LLP
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty										50.00%
Profit sharing percent										50.00%
FNIC | Quota Share Two | Florida Homeowners Book of Business
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty												10.00%				10.00%
FNIC | Quota Share Two | Florida Homeowners Book of Business | Minimum
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty																10.00%
FNIC | Quota Share Two | Florida Homeowners Book of Business | Maximum
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty																20.00%
FNIC | Combined FNIC, MIC and MNIC Twenty Twenty to Twenty Twenty-one Catastrophe Excess Loss Reinsurance Programs
Liability for Catastrophe Claims [Line Items]
Excess retention, amount reinsured																$ 25,000
Excess retention, retention percentage																100.00%
Excess retention, amount reinsured, co-participation																$ 6,000
Excess retention, retention percentage, co-participation																9.10%
Excess retention, threshold limit above initial insured amount																$ 70,000
Potential decrease for parametric basis with excess and surplus lines carrier, percent			28.50%													28.50%
FNIC | Combined FNIC, MIC and MNIC Twenty Twenty to Twenty Twenty-one Catastrophe Excess Loss Reinsurance Programs | Second and Third Event Coverage
Liability for Catastrophe Claims [Line Items]
Excess retention, amount reinsured																$ 10,000
Excess retention, retention percentage, co-participation																71.50%
Excess retention, threshold limit above initial insured amount																$ 15,000
Second and third event retention, combined basis																14,300
FNIC | Combined FNIC, MIC and MNIC Twenty Twenty to Twenty Twenty-one Catastrophe Excess Loss Reinsurance Programs | Second and Third Event Coverage | Hurricane Delta and Subsequent Events
Liability for Catastrophe Claims [Line Items]
Excess retention, amount reinsured					$ 13,500			$ 8,000	$ 39,200
Reinsurance payable and funds withheld liabilities					$ 2,000			$ 875	$ 11,200
Excess retention, retention percentage, co-participation								50.00%
Excess retention, threshold limit above initial insured amount								$ 10,000
FNIC | Maison Insurance Company (MIC) | Hurricane Delta and Subsequent Events | Subsequent Event
Liability for Catastrophe Claims [Line Items]
Reinsurance payable and funds withheld liabilities	$ 13,000	$ 2,300
Excess retention, retention percentage, co-participation		65.00%
FNIC | Maison Insurance Company (MIC) | First Event Coverage | Hurricane Delta and Subsequent Events | Subsequent Event
Liability for Catastrophe Claims [Line Items]
Excess retention, amount reinsured	$ 25,000	$ 10,000
Excess retention, retention percentage, co-participation	50.00%	65.00%
Excess retention, threshold limit above initial insured amount	$ 70,000	$ 15,000
Excess retention, occurrence deductible		900
FNIC | Maison Insurance Company (MIC) | Second Event Coverage | Hurricane Delta and Subsequent Events | Subsequent Event
Liability for Catastrophe Claims [Line Items]
Excess retention, amount reinsured	$ 10,000	$ 4,200
Excess retention, retention percentage, co-participation	100.00%
Excess retention, threshold limit above initial insured amount	$ 15,000
Private and FHCF Reinsurance | 2019-2020 Catastrophe Excess Loss Reinsurance Programs
Liability for Catastrophe Claims [Line Items]
Maximum single event coverage			$ 1,300,000													1,300,000
Maximum second and third event coverage			15,000													15,000
Liability for catastrophe claims			1,900,000													$ 1,900,000
Private and FHCF Reinsurance | 2019-2020 Catastrophe Excess Loss Reinsurance Programs | Maximum
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty																75.00%
Private and FHCF Reinsurance | Combined FNIC, MIC and MNIC Twenty Twenty to Twenty Twenty-one Catastrophe Excess Loss Reinsurance Programs
Liability for Catastrophe Claims [Line Items]
Maximum single event coverage			650,000													$ 650,000
Excess retention, amount reinsured																25,000
Aggregate maximum single event coverage			1,300,000													1,300,000
Private and FHCF Reinsurance | Combined FNIC, MIC and MNIC Twenty Twenty to Twenty Twenty-one Catastrophe Excess Loss Reinsurance Programs | First Event Coverage
Liability for Catastrophe Claims [Line Items]
Excess retention, amount reinsured																$ 31,000
Private and FHCF Reinsurance | Combined FNIC, MIC and MNIC Twenty Twenty to Twenty Twenty-one Catastrophe Excess Loss Reinsurance Programs | Maximum
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty																90.00%
Monarch National S Florida | 2019-2020 Catastrophe Excess Loss Reinsurance Programs
Liability for Catastrophe Claims [Line Items]
Maximum second and third event coverage			10,000													$ 10,000
Additional coverage amount			2,000													2,000
Maison | 2019-2020 Catastrophe Excess Loss Reinsurance Programs
Liability for Catastrophe Claims [Line Items]
Additional coverage amount			5,000													5,000
Florida | Quota Share Treaties | Property Insurance Product Line
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty													10.00%	30.00%
Florida | Quota Share One | Property Insurance Product Line
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 | Federated National's Florida Exposure | 2019-2020 Catastrophe Excess Loss Reinsurance Programs
Liability for Catastrophe Claims [Line Items]
Reinsurance payable and funds withheld liabilities			$ 178,500													$ 178,500
Florida | FNIC | Quota Share Treaties | Property Insurance Product Line
Liability for Catastrophe Claims [Line Items]
Percentage of property quota share reinsurance treaty																40.00%