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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, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]    
Available-for-sale securities, Fair Value $ 404,131 $ 377,712
Held-to-maturity securities, Amortized Cost or Cost 5,551 6,619
Total investments, Amortized Cost or Cost 406,358 378,221
Total investments, Gross Unrealized Gain 7,588 10,103
Total investments, Gross Unrealized Loss 4,342 4,173
Total investments, Fair Value 409,604 384,151
Debt Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 376,644 338,021
Available-for-sale securities, Gross Unrealized Gain 2,046 3,250
Available-for-sale securities, Gross Unrealized Loss 3,934 2,093
Available-for-sale securities, Fair Value 374,756 339,178
Held-to-maturity securities, Amortized Cost or Cost 5,551 6,619
Held-to-maturity securities, Gross Unrealized Gains 42 44
Held-to-maturity securities, Gross Unrealized Losses 120 224
Held-to-maturity securities, Fair Value 5,473 6,439
United States Government Obligations and Authorities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 62,881 61,384
Available-for-sale securities, Gross Unrealized Gain 177 489
Available-for-sale securities, Gross Unrealized Loss 853 320
Available-for-sale securities, Fair Value 62,205 61,553
Held-to-maturity securities, Amortized Cost or Cost 4,163 4,275
Held-to-maturity securities, Gross Unrealized Gains 22 30
Held-to-maturity securities, Gross Unrealized Losses 118 204
Held-to-maturity securities, Fair Value 4,067 4,101
Obligations of States and Political Subdivisions [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 152,823 109,152
Available-for-sale securities, Gross Unrealized Gain 427 1,590
Available-for-sale securities, Gross Unrealized Loss 2,067 40
Available-for-sale securities, Fair Value 151,183 110,702
Corporate [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 149,053 154,957
Available-for-sale securities, Gross Unrealized Gain 1,347 1,153
Available-for-sale securities, Gross Unrealized Loss 895 1,490
Available-for-sale securities, Fair Value 149,505 154,620
Held-to-maturity securities, Amortized Cost or Cost 1,317 2,253
Held-to-maturity securities, Gross Unrealized Gains 20 14
Held-to-maturity securities, Gross Unrealized Losses 2 20
Held-to-maturity securities, Fair Value 1,335 2,247
International [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 11,887 12,528
Available-for-sale securities, Gross Unrealized Gain 95 18
Available-for-sale securities, Gross Unrealized Loss 119 243
Available-for-sale securities, Fair Value 11,863 12,303
Held-to-maturity securities, Amortized Cost or Cost 71 91
Held-to-maturity securities, Fair Value 71 91
Equity Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Amortized Cost or Cost 24,163 33,581
Available-for-sale securities, Gross Unrealized Gain 5,500 6,809
Available-for-sale securities, Gross Unrealized Loss 288 1,856
Available-for-sale securities, Fair Value 29,375 38,534
Parent Company [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, Fair Value $ 31,750 $ 25,649