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INVESTMENTS (Difference Between Amortized Cost or Cost and Estimated Fair Value, by Major Investment Category) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]    
Available-for-sale securities, Fair Value $ 420,213 $ 377,712
Held-to-maturity securities, Amortized Cost or Cost 5,880 6,619
Total investments, Amortized Cost or Cost 411,666 378,221
Total investments, Gross Unrealized Gain 15,570 10,103
Total investments, Gross Unrealized Loss 1,083 4,173
Total investments, Fair Value 426,153 384,151
Debt securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 370,881 338,021
Available-for-sale securities, Gross Unrealized Gain 8,173 3,250
Available-for-sale securities, Gross Unrealized Loss 175 2,093
Available-for-sale securities, Fair Value 378,879 339,178
Held-to-maturity securities, Amortized Cost or Cost 5,880 6,619
Held-to-maturity securities, Gross Unrealized Gains 119 44
Held-to-maturity securities, Gross Unrealized Losses 59 224
Held-to-maturity securities, Fair Value 5,940 6,439
United States Government Obligations and Authorities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 64,810 61,384
Available-for-sale securities, Gross Unrealized Gain 1,039 489
Available-for-sale securities, Gross Unrealized Loss 39 320
Available-for-sale securities, Fair Value 65,810 61,553
Held-to-maturity securities, Amortized Cost or Cost 4,173 4,275
Held-to-maturity securities, Gross Unrealized Gains 70 30
Held-to-maturity securities, Gross Unrealized Losses 59 204
Held-to-maturity securities, Fair Value 4,184 4,101
Obligations of States and Political Subdivisions [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 148,366 109,152
Available-for-sale securities, Gross Unrealized Gain 2,556 1,590
Available-for-sale securities, Gross Unrealized Loss 49 40
Available-for-sale securities, Fair Value 150,873 110,702
Corporate [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 144,990 154,957
Available-for-sale securities, Gross Unrealized Gain 4,305 1,153
Available-for-sale securities, Gross Unrealized Loss 85 1,490
Available-for-sale securities, Fair Value 149,210 154,620
Held-to-maturity securities, Amortized Cost or Cost 1,636 2,253
Held-to-maturity securities, Gross Unrealized Gains 47 14
Held-to-maturity securities, Gross Unrealized Losses   20
Held-to-maturity securities, Fair Value 1,683 2,247
International [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 12,715 12,528
Available-for-sale securities, Gross Unrealized Gain 273 18
Available-for-sale securities, Gross Unrealized Loss 2 243
Available-for-sale securities, Fair Value 12,986 12,303
Held-to-maturity securities, Amortized Cost or Cost 71 91
Held-to-maturity securities, Gross Unrealized Gains 2  
Held-to-maturity securities, Fair Value 73 91
Equity Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 34,905 33,581
Available-for-sale securities, Gross Unrealized Gain 7,278 6,809
Available-for-sale securities, Gross Unrealized Loss 849 1,856
Available-for-sale securities, Fair Value $ 41,334 $ 38,534