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INVESTMENTS (Summary of Amortized Cost and Fair Value of Debt and Equity Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Available-for-sale securities, Fair Value $ 445,972 $ 438,672
Held-to-maturity securities, Amortized Cost or Cost 5,298 5,349
Total investments, Amortized Cost or Cost 439,965 441,734
Total investments, Fair Value 434,621 443,946
Debt Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 434,667 422,300
Available-for-sale securities, Gross Unrealized Gain 849 2,938
Available-for-sale securities, Gross Unrealized Losses 6,059 2,000
Available-for-sale securities, Fair Value 429,457 423,238
Held-to-maturity securities, Amortized Cost or Cost 5,298 5,349
Held-to-maturity securities, Gross Unrealized Gains 9 31
Held-to-maturity securities, Gross Unrealized Losses 143 106
Held-to-maturity Securities, Fair Value 5,164 5,274
Total investments, Gross Unrealized Gain 858 4,597
Total investments, Gross Unrealized Loss 6,202 2,385
United States Government Obligations and Authorities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 131,292 98,739
Available-for-sale securities, Gross Unrealized Gain 231 244
Available-for-sale securities, Gross Unrealized Losses 1,813 846
Available-for-sale securities, Fair Value 129,710 98,137
Held-to-maturity securities, Amortized Cost or Cost 4,161 4,160
Held-to-maturity securities, Gross Unrealized Gains 3 9
Held-to-maturity securities, Gross Unrealized Losses 139 106
Held-to-maturity Securities, Fair Value 4,025 4,063
Obligations of States and Political Subdivisions [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 23,535 66,319
Available-for-sale securities, Gross Unrealized Gain 54 325
Available-for-sale securities, Gross Unrealized Losses 287 378
Available-for-sale securities, Fair Value 23,302 66,266
Corporate [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 261,772 239,435
Available-for-sale securities, Gross Unrealized Gain 553 2,233
Available-for-sale securities, Gross Unrealized Losses 3,807 749
Available-for-sale securities, Fair Value 258,518 240,919
Held-to-maturity securities, Amortized Cost or Cost 1,072 1,123
Held-to-maturity securities, Gross Unrealized Gains 6 21
Held-to-maturity securities, Gross Unrealized Losses 4 0
Held-to-maturity Securities, Fair Value 1,074 1,144
International [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 18,068 17,807
Available-for-sale securities, Gross Unrealized Gain 11 136
Available-for-sale securities, Gross Unrealized Losses 152 27
Available-for-sale securities, Fair Value 17,927 17,916
Held-to-maturity securities, Amortized Cost or Cost 65 66
Held-to-maturity securities, Gross Unrealized Gains 0 1
Held-to-maturity securities, Gross Unrealized Losses 0 0
Held-to-maturity Securities, Fair Value $ 65 67
Equity Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost   14,085
Available-for-sale securities, Gross Unrealized Gain   1,628
Available-for-sale securities, Gross Unrealized Losses   279
Available-for-sale securities, Fair Value   $ 15,434