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INVESTMENTS (Summary of Amortized Cost and Fair Value of Debt and Equity Securities) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Available-for-sale securities, Fair Value $ 429,355 $ 404,131
Held-to-maturity securities, Amortized Cost or Cost 5,421 5,551
Total investments, Amortized Cost or Cost 426,528 406,358
Total investments, Gross Unrealized Gain 10,070 7,588
Total investments, Gross Unrealized Loss 1,882 4,342
Total investments, Fair Value 434,716 409,604
Debt Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 380,905 376,644
Available-for-sale securities, Gross Unrealized Gain 4,055 2,046
Available-for-sale securities, Gross Unrealized Loss 1,050 3,934
Available-for-sale securities, Fair Value 383,910 374,756
Held-to-maturity securities, Amortized Cost or Cost 5,421 5,551
Held-to-maturity securities, Gross Unrealized Gains 49 42
Held-to-maturity securities, Gross Unrealized Losses 109 120
Held-to-maturity securities, Fair Value 5,361 5,473
United States Government Obligations and Authorities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 85,643 62,881
Available-for-sale securities, Gross Unrealized Gain 462 177
Available-for-sale securities, Gross Unrealized Loss 484 853
Available-for-sale securities, Fair Value 85,621 62,205
Held-to-maturity securities, Amortized Cost or Cost 4,165 4,163
Held-to-maturity securities, Gross Unrealized Gains 21 22
Held-to-maturity securities, Gross Unrealized Losses 109 118
Held-to-maturity securities, Fair Value 4,077 4,067
Obligations of States and Political Subdivisions [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 86,295 152,823
Available-for-sale securities, Gross Unrealized Gain 852 427
Available-for-sale securities, Gross Unrealized Loss 228 2,067
Available-for-sale securities, Fair Value 86,919 151,183
Corporate [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 194,484 149,053
Available-for-sale securities, Gross Unrealized Gain 2,577 1,347
Available-for-sale securities, Gross Unrealized Loss 328 895
Available-for-sale securities, Fair Value 196,733 149,505
Held-to-maturity securities, Amortized Cost or Cost 1,190 1,317
Held-to-maturity securities, Gross Unrealized Gains 27 20
Held-to-maturity securities, Gross Unrealized Losses   2
Held-to-maturity securities, Fair Value 1,217 1,335
International [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 14,483 11,887
Available-for-sale securities, Gross Unrealized Gain 164 95
Available-for-sale securities, Gross Unrealized Loss 10 119
Available-for-sale securities, Fair Value 14,637 11,863
Held-to-maturity securities, Amortized Cost or Cost 66 71
Held-to-maturity securities, Gross Unrealized Gains 1  
Held-to-maturity securities, Fair Value 67 71
Equity Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 40,202 24,163
Available-for-sale securities, Gross Unrealized Gain 5,966 5,500
Available-for-sale securities, Gross Unrealized Loss 723 288
Available-for-sale securities, Fair Value $ 45,445 $ 29,375