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INVESTMENTS - (Summary of Amortized Cost and Fair Value of Debt and Equity Securities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Available-for-sale securities, Fair Value $ 438,672 $ 404,131
Held-to-maturity securities, Amortized Cost or Cost 5,349 5,551
Total investments, Amortized Cost or Cost 441,734 406,358
Total investments, Gross Unrealized Gain 4,597 7,588
Total investments, Gross Unrealized Loss 2,385 4,342
Total investments, Fair Value 443,946 409,604
Debt Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 422,300 376,644
Available-for-sale securities, Gross Unrealized Gain 2,938 2,046
Available-for-sale securities, Gross Unrealized Loss 2,000 3,934
Available-for-sale securities, Fair Value 423,238 374,756
Held-to-maturity securities, Amortized Cost or Cost 5,349 5,551
Held-to-maturity securities, Gross Unrealized Gains 31 42
Held-to-maturity securities, Gross Unrealized Losses 106 120
Held-to-maturity securities, fair Value 5,274 5,473
United States Government Obligations and Authorities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 98,739 62,881
Available-for-sale securities, Gross Unrealized Gain 244 177
Available-for-sale securities, Gross Unrealized Loss 846 853
Available-for-sale securities, Fair Value 98,137 62,205
Held-to-maturity securities, Amortized Cost or Cost 4,160 4,163
Held-to-maturity securities, Gross Unrealized Gains 9 22
Held-to-maturity securities, Gross Unrealized Losses 106 118
Held-to-maturity securities, fair Value 4,063 4,067
Obligations of States and Political Subdivisions [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 66,319 152,823
Available-for-sale securities, Gross Unrealized Gain 325 427
Available-for-sale securities, Gross Unrealized Loss 378 2,067
Available-for-sale securities, Fair Value 66,266 151,183
Corporate [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 239,435 149,053
Available-for-sale securities, Gross Unrealized Gain 2,233 1,347
Available-for-sale securities, Gross Unrealized Loss 749 895
Available-for-sale securities, Fair Value 240,919 149,505
Held-to-maturity securities, Amortized Cost or Cost 1,123 1,317
Held-to-maturity securities, Gross Unrealized Gains 21 20
Held-to-maturity securities, Gross Unrealized Losses 0 2
Held-to-maturity securities, fair Value 1,144 1,335
International [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 17,807 11,887
Available-for-sale securities, Gross Unrealized Gain 136 95
Available-for-sale securities, Gross Unrealized Loss 27 119
Available-for-sale securities, Fair Value 17,916 11,863
Held-to-maturity securities, Amortized Cost or Cost 66 71
Held-to-maturity securities, Gross Unrealized Gains 1 0
Held-to-maturity securities, Gross Unrealized Losses 0 0
Held-to-maturity securities, fair Value 67 71
Equity Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 14,085 24,163
Available-for-sale securities, Gross Unrealized Gain 1,628 5,500
Available-for-sale securities, Gross Unrealized Loss 279 288
Available-for-sale securities, Fair Value $ 15,434 $ 29,375