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DISCLOSURES ABOUT THE FAIR VALUE OF FINANCIAL INSTRUMENTS (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Security
Dec. 31, 2014
USD ($)
Security
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure $ 1,367,268 $ 1,324,535
Short-term investments 38,599 53,262
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 1.35% 1.35%
Upward adjustment to fair value input discount rate (percent) 0.50% 0.50%
Period after which rate is adjusted 5 years 5 years
Debt Securities [Member]    
Assets [Abstract]    
Number Of Broker Quoted Securities | Security 0 0
Number of securities not priced by independent pricing service | Security 7 10
Available-for-sale Securities, Fair Value Disclosure $ 1,161,025 $ 1,127,499
US Treasury Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 12,589 9,703
US Government-sponsored Enterprises Debt Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 202,666 215,616
US States and Political Subdivisions Debt Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 344,359 326,058
Commercial Mortgage Backed Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 46,108 46,762
Residential Mortgage Backed Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 88,543 97,953
Collateralized Debt Obligations [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 17,844 16,005
Corporate Debt Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 448,916 415,402
Equity Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 206,243 197,036
Common stocks Financial services [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 33,955 34,379
Common stocks Information technology [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 28,102 26,865
Common stocks Healthcare [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 25,894 26,852
Common stocks Consumer staples [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 18,200 16,694
Common stocks Consumer discretionary [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 18,923 22,691
Common stocks Energy [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 21,068 22,863
Common stocks Industrials [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 20,416 18,221
Common stocks Other [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 20,683 16,056
Nonredeemable Preferred Stock [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 19,002 12,415
Carrying amount [Member]    
Assets [Abstract]    
Short-term investments 38,599 53,262
Liabilities [Abstract]    
Surplus notes 25,000 25,000
Carrying amount [Member] | Debt Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 1,161,025 1,127,499
Carrying amount [Member] | US Treasury Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 12,589 9,703
Carrying amount [Member] | US Government-sponsored Enterprises Debt Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 202,666 215,616
Carrying amount [Member] | US States and Political Subdivisions Debt Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 344,359 326,058
Carrying amount [Member] | Commercial Mortgage Backed Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 46,108 46,762
Carrying amount [Member] | Residential Mortgage Backed Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 88,543 97,953
Carrying amount [Member] | Collateralized Debt Obligations [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 17,844 16,005
Carrying amount [Member] | Corporate Debt Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 448,916 415,402
Carrying amount [Member] | Equity Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 206,243 197,036
Carrying amount [Member] | Common stocks Financial services [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 33,955 34,379
Carrying amount [Member] | Common stocks Information technology [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 28,102 26,865
Carrying amount [Member] | Common stocks Healthcare [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 25,894 26,852
Carrying amount [Member] | Common stocks Consumer staples [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 18,200 16,694
Carrying amount [Member] | Common stocks Consumer discretionary [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 18,923 22,691
Carrying amount [Member] | Common stocks Energy [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 21,068 22,863
Carrying amount [Member] | Common stocks Industrials [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 20,416 18,221
Carrying amount [Member] | Common stocks Other [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 20,683 16,056
Carrying amount [Member] | Nonredeemable Preferred Stock [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 19,002 12,415
Estimated fair value [Member]    
Assets [Abstract]    
Short-term investments 38,599 53,262
Liabilities [Abstract]    
Surplus notes 10,823 12,308
Estimated fair value [Member] | Debt Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 1,161,025 1,127,499
Estimated fair value [Member] | US Treasury Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 12,589 9,703
Estimated fair value [Member] | US Government-sponsored Enterprises Debt Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 202,666 215,616
Estimated fair value [Member] | US States and Political Subdivisions Debt Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 344,359 326,058
Estimated fair value [Member] | Commercial Mortgage Backed Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 46,108 46,762
Estimated fair value [Member] | Residential Mortgage Backed Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 88,543 97,953
Estimated fair value [Member] | Collateralized Debt Obligations [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 17,844 16,005
Estimated fair value [Member] | Corporate Debt Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 448,916 415,402
Estimated fair value [Member] | Equity Securities [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 206,243 197,036
Estimated fair value [Member] | Common stocks Financial services [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 33,955 34,379
Estimated fair value [Member] | Common stocks Information technology [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 28,102 26,865
Estimated fair value [Member] | Common stocks Healthcare [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 25,894 26,852
Estimated fair value [Member] | Common stocks Consumer staples [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 18,200 16,694
Estimated fair value [Member] | Common stocks Consumer discretionary [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 18,923 22,691
Estimated fair value [Member] | Common stocks Energy [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 21,068 22,863
Estimated fair value [Member] | Common stocks Industrials [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 20,416 18,221
Estimated fair value [Member] | Common stocks Other [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure 20,683 16,056
Estimated fair value [Member] | Nonredeemable Preferred Stock [Member]    
Assets [Abstract]    
Available-for-sale Securities, Fair Value Disclosure $ 19,002 $ 12,415