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DISCLOSURES ABOUT THE FAIR VALUE OF FINANCIAL INSTRUMENTS (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Security
Dec. 31, 2017
USD ($)
Security
Assets [Abstract]    
Fixed maturity securities available-for-sale $ 1,282,909 $ 1,275,016
Equity investments, at fair value 215,363  
Equity securities available-for-sale   228,115
Short-term investments 28,204 23,613
Liabilities [Abstract]    
Surplus notes $ 25,000 $ 25,000
Period for surplus notes included in assumptions 25 years 25 years
Current interest rate on surplus notes 2.73% 1.35%
Upward adjustment to fair value input discount rate (percent) 0.50% 0.50%
Period after which rate is adjusted   5 years
Debt Securities [Member]    
Assets [Abstract]    
Fixed maturity securities available-for-sale $ 1,282,909 $ 1,275,016
Number Of Broker Quoted Securities | Security 0 0
Number of securities not priced by independent pricing service | Security 6 8
U.S. treasury    
Assets [Abstract]    
Fixed maturity securities available-for-sale $ 8,021 $ 8,078
U.S. government-sponsored agencies    
Assets [Abstract]    
Fixed maturity securities available-for-sale 304,479 297,949
Obligations of states and political subdivisions    
Assets [Abstract]    
Fixed maturity securities available-for-sale 283,651 307,536
Commercial mortgage-backed    
Assets [Abstract]    
Fixed maturity securities available-for-sale 84,379 83,980
Residential mortgage-backed    
Assets [Abstract]    
Fixed maturity securities available-for-sale 162,137 119,799
Other asset-backed    
Assets [Abstract]    
Fixed maturity securities available-for-sale 20,834 24,114
Corporate    
Assets [Abstract]    
Fixed maturity securities available-for-sale 419,408 433,560
Equity Securities [Member]    
Assets [Abstract]    
Equity securities available-for-sale   228,115
Financial services    
Assets [Abstract]    
Equity securities available-for-sale   43,522
Information technology    
Assets [Abstract]    
Equity securities available-for-sale   35,810
Healthcare    
Assets [Abstract]    
Equity securities available-for-sale   30,595
Consumer staples    
Assets [Abstract]    
Equity securities available-for-sale   14,127
Consumer discretionary    
Assets [Abstract]    
Equity securities available-for-sale   20,538
Energy    
Assets [Abstract]    
Equity securities available-for-sale   16,905
Industrials    
Assets [Abstract]    
Equity securities available-for-sale   28,489
Other    
Assets [Abstract]    
Equity securities available-for-sale   16,421
Non-redeemable preferred stocks    
Assets [Abstract]    
Equity securities available-for-sale   21,708
Carrying amount [Member]    
Assets [Abstract]    
Short-term investments 28,204 23,613
Liabilities [Abstract]    
Surplus notes 25,000 25,000
Carrying amount [Member] | Debt Securities [Member]    
Assets [Abstract]    
Fixed maturity securities available-for-sale 1,282,909 1,275,016
Carrying amount [Member] | U.S. treasury    
Assets [Abstract]    
Fixed maturity securities available-for-sale 8,021 8,078
Carrying amount [Member] | U.S. government-sponsored agencies    
Assets [Abstract]    
Fixed maturity securities available-for-sale 304,479 297,949
Carrying amount [Member] | Obligations of states and political subdivisions    
Assets [Abstract]    
Fixed maturity securities available-for-sale 283,651 307,536
Carrying amount [Member] | Commercial mortgage-backed    
Assets [Abstract]    
Fixed maturity securities available-for-sale 84,379 83,980
Carrying amount [Member] | Residential mortgage-backed    
Assets [Abstract]    
Fixed maturity securities available-for-sale 162,137 119,799
Carrying amount [Member] | Other asset-backed    
Assets [Abstract]    
Fixed maturity securities available-for-sale 20,834 24,114
Carrying amount [Member] | Corporate    
Assets [Abstract]    
Fixed maturity securities available-for-sale 419,408 433,560
Carrying amount [Member] | Equity Securities [Member]    
Assets [Abstract]    
Equity investments, at fair value 215,363  
Equity securities available-for-sale   228,115
Carrying amount [Member] | Financial services    
Assets [Abstract]    
Equity investments, at fair value 41,839  
Equity securities available-for-sale   43,522
Carrying amount [Member] | Information technology    
Assets [Abstract]    
Equity investments, at fair value 31,581  
Equity securities available-for-sale   35,810
Carrying amount [Member] | Healthcare    
Assets [Abstract]    
Equity investments, at fair value 34,571  
Equity securities available-for-sale   30,595
Carrying amount [Member] | Consumer staples    
Assets [Abstract]    
Equity investments, at fair value 13,180  
Equity securities available-for-sale   14,127
Carrying amount [Member] | Consumer discretionary    
Assets [Abstract]    
Equity investments, at fair value 22,765  
Equity securities available-for-sale   20,538
Carrying amount [Member] | Energy    
Assets [Abstract]    
Equity investments, at fair value 13,372  
Equity securities available-for-sale   16,905
Carrying amount [Member] | Industrials    
Assets [Abstract]    
Equity investments, at fair value 19,389  
Equity securities available-for-sale   28,489
Carrying amount [Member] | Other    
Assets [Abstract]    
Equity investments, at fair value 14,371  
Equity securities available-for-sale   16,421
Carrying amount [Member] | Non-redeemable preferred stocks    
Assets [Abstract]    
Equity investments, at fair value 16,654  
Equity securities available-for-sale   21,708
Carrying amount [Member] | Investment funds    
Assets [Abstract]    
Equity investments, at fair value 7,641  
Estimated fair value [Member]    
Assets [Abstract]    
Short-term investments 28,204 23,613
Liabilities [Abstract]    
Surplus notes 15,259 16,689
Estimated fair value [Member] | Debt Securities [Member]    
Assets [Abstract]    
Fixed maturity securities available-for-sale 1,282,909 1,275,016
Estimated fair value [Member] | U.S. treasury    
Assets [Abstract]    
Fixed maturity securities available-for-sale 8,021 8,078
Estimated fair value [Member] | U.S. government-sponsored agencies    
Assets [Abstract]    
Fixed maturity securities available-for-sale 304,479 297,949
Estimated fair value [Member] | Obligations of states and political subdivisions    
Assets [Abstract]    
Fixed maturity securities available-for-sale 283,651 307,536
Estimated fair value [Member] | Commercial mortgage-backed    
Assets [Abstract]    
Fixed maturity securities available-for-sale 84,379 83,980
Estimated fair value [Member] | Residential mortgage-backed    
Assets [Abstract]    
Fixed maturity securities available-for-sale 162,137 119,799
Estimated fair value [Member] | Other asset-backed    
Assets [Abstract]    
Fixed maturity securities available-for-sale 20,834 24,114
Estimated fair value [Member] | Corporate    
Assets [Abstract]    
Fixed maturity securities available-for-sale 419,408 433,560
Estimated fair value [Member] | Equity Securities [Member]    
Assets [Abstract]    
Equity investments, at fair value 215,363  
Equity securities available-for-sale   228,115
Estimated fair value [Member] | Financial services    
Assets [Abstract]    
Equity investments, at fair value 41,839  
Equity securities available-for-sale   43,522
Estimated fair value [Member] | Information technology    
Assets [Abstract]    
Equity investments, at fair value 31,581  
Equity securities available-for-sale   35,810
Estimated fair value [Member] | Healthcare    
Assets [Abstract]    
Equity investments, at fair value 34,571  
Equity securities available-for-sale   30,595
Estimated fair value [Member] | Consumer staples    
Assets [Abstract]    
Equity investments, at fair value 13,180  
Equity securities available-for-sale   14,127
Estimated fair value [Member] | Consumer discretionary    
Assets [Abstract]    
Equity investments, at fair value 22,765  
Equity securities available-for-sale   20,538
Estimated fair value [Member] | Energy    
Assets [Abstract]    
Equity investments, at fair value 13,372  
Equity securities available-for-sale   16,905
Estimated fair value [Member] | Industrials    
Assets [Abstract]    
Equity investments, at fair value 19,389  
Equity securities available-for-sale   28,489
Estimated fair value [Member] | Other    
Assets [Abstract]    
Equity investments, at fair value 14,371  
Equity securities available-for-sale   16,421
Estimated fair value [Member] | Non-redeemable preferred stocks    
Assets [Abstract]    
Equity investments, at fair value 16,654  
Equity securities available-for-sale   $ 21,708
Estimated fair value [Member] | Investment funds    
Assets [Abstract]    
Equity investments, at fair value $ 7,641