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INVESTMENTS (Summary of Amortized Cost and Fair Value of Debt and Equity Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Available-for-sale securities, Fair Value $ 442,872 $ 438,672
Held-to-maturity securities, Amortized Cost or Cost 5,288 5,349
Total investments, Amortized Cost or Cost 437,943 441,734
Total investments, Fair Value 430,621 443,946
Debt Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 432,655 422,300
Available-for-sale securities, Gross Unrealized Gain 476 2,938
Available-for-sale securities, Gross Unrealized Losses 7,642 2,000
Available-for-sale securities, Fair Value 425,489 423,238
Held-to-maturity securities, Amortized Cost or Cost 5,288 5,349
Held-to-maturity securities, Gross Unrealized Gains 5 31
Held-to-maturity securities, Gross Unrealized Losses 161 106
Held-to-maturity securities, fair value 5,132 5,274
Total investments, Gross Unrealized Gain 481 4,597
Total investments, Gross Unrealized Loss 7,803 2,385
United States Government Obligations and Authorities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 109,020 98,739
Available-for-sale securities, Gross Unrealized Gain 135 244
Available-for-sale securities, Gross Unrealized Losses 1,928 846
Available-for-sale securities, Fair Value 107,227 98,137
Held-to-maturity securities, Amortized Cost or Cost 4,172 4,160
Held-to-maturity securities, Gross Unrealized Gains 2 9
Held-to-maturity securities, Gross Unrealized Losses 154 106
Held-to-maturity securities, fair value 4,020 4,063
Obligations of States and Political Subdivisions [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 24,274 66,319
Available-for-sale securities, Gross Unrealized Gain 45 325
Available-for-sale securities, Gross Unrealized Losses 278 378
Available-for-sale securities, Fair Value 24,041 66,266
Corporate [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 279,836 239,435
Available-for-sale securities, Gross Unrealized Gain 287 2,233
Available-for-sale securities, Gross Unrealized Losses 5,242 749
Available-for-sale securities, Fair Value 274,881 240,919
Held-to-maturity securities, Amortized Cost or Cost 1,051 1,123
Held-to-maturity securities, Gross Unrealized Gains 3 21
Held-to-maturity securities, Gross Unrealized Losses 7 0
Held-to-maturity securities, fair value 1,047 1,144
International [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 19,525 17,807
Available-for-sale securities, Gross Unrealized Gain 9 136
Available-for-sale securities, Gross Unrealized Losses 194 27
Available-for-sale securities, Fair Value 19,340 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