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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, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Available-for-sale securities, Fair Value $ 446,399 $ 438,672
Held-to-maturity securities, Amortized Cost or Cost 5,126 5,349
Total investments, Amortized Cost or Cost 438,790 441,734
Total investments, Gross Unrealized Gain 1,643 4,597
Total investments, Gross Unrealized Loss 6,828 2,385
Total investments, Fair Value 433,605 443,946
Debt Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 433,664 422,300
Available-for-sale securities, Gross Unrealized Gain 1,640 2,938
Available-for-sale securities, Gross Unrealized Loss 6,663 2,000
Available-for-sale securities, Fair Value 428,641 423,238
Held-to-maturity securities, Amortized Cost or Cost 5,126 5,349
Held-to-maturity securities, Gross Unrealized Gains 3 31
Held-to-maturity securities, Gross Unrealized Losses 165 106
Held-to-maturity securities, fair Value 4,964 5,274
United States Government Obligations and Authorities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 127,928 98,739
Available-for-sale securities, Gross Unrealized Gain 1,091 244
Available-for-sale securities, Gross Unrealized Loss 1,151 846
Available-for-sale securities, Fair Value 127,868 98,137
Held-to-maturity securities, Amortized Cost or Cost 4,085 4,160
Held-to-maturity securities, Gross Unrealized Gains 1 9
Held-to-maturity securities, Gross Unrealized Losses 158 106
Held-to-maturity securities, fair Value 3,928 4,063
Obligations of States and Political Subdivisions [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 9,870 66,319
Available-for-sale securities, Gross Unrealized Gain 27 325
Available-for-sale securities, Gross Unrealized Loss 130 378
Available-for-sale securities, Fair Value 9,767 66,266
Corporate [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 273,192 239,435
Available-for-sale securities, Gross Unrealized Gain 510 2,233
Available-for-sale securities, Gross Unrealized Loss 4,971 749
Available-for-sale securities, Fair Value 268,731 240,919
Held-to-maturity securities, Amortized Cost or Cost 986 1,123
Held-to-maturity securities, Gross Unrealized Gains 2 21
Held-to-maturity securities, Gross Unrealized Losses 6 0
Held-to-maturity securities, fair Value 982 1,144
International [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 22,674 17,807
Available-for-sale securities, Gross Unrealized Gain 12 136
Available-for-sale securities, Gross Unrealized Loss 411 27
Available-for-sale securities, Fair Value 22,275 17,916
Held-to-maturity securities, Amortized Cost or Cost 55 66
Held-to-maturity securities, Gross Unrealized Gains 0 1
Held-to-maturity securities, Gross Unrealized Losses 1 0
Held-to-maturity securities, fair Value $ 54 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 Loss   279
Available-for-sale securities, Fair Value   $ 15,434