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INVESTMENTS (Summary of Amortized Cost and Fair Value of Debt and Equity Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, at amortized cost $ 438,720 $ 433,664
Debt securities - available-for-sale, at fair value: 451,124 428,641
Held-to-maturity securities, Amortized Cost or Cost 4,499 5,126
Total investments, Amortized Cost or Cost 443,219 438,790
Total investments, Gross Unrealized Gain 12,756 1,643
Total investments, Gross Unrealized Loss 388 6,828
Total investments, Fair Value 455,587 433,605
Debt Securities    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, at amortized cost 438,720 433,664
Debt securities, available-for-sale securities, Gross Unrealized Gain 12,724 1,640
Debt securities, available-for-sale securities, Gross Unrealized Losses 320 6,663
Debt securities - available-for-sale, at fair value: 451,124 428,641
Held-to-maturity securities, Amortized Cost or Cost 4,499 5,126
Held-to-maturity securities, Gross Unrealized Gains 32 3
Held-to-maturity securities, Gross Unrealized Losses 68 165
Held-to-maturity securities, fair value 4,463 4,964
United States Government Obligations and Authorities    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, at amortized cost 147,663 127,928
Debt securities, available-for-sale securities, Gross Unrealized Gain 3,206 1,091
Debt securities, available-for-sale securities, Gross Unrealized Losses 149 1,151
Debt securities - available-for-sale, at fair value: 150,720 127,868
Held-to-maturity securities, Amortized Cost or Cost 3,591 4,085
Held-to-maturity securities, Gross Unrealized Gains 11 1
Held-to-maturity securities, Gross Unrealized Losses 68 158
Held-to-maturity securities, fair value 3,534 3,928
Obligations of States and Political Subdivisions    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, at amortized cost 11,483 9,870
Debt securities, available-for-sale securities, Gross Unrealized Gain 240 27
Debt securities, available-for-sale securities, Gross Unrealized Losses 6 130
Debt securities - available-for-sale, at fair value: 11,717 9,767
Corporate    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, at amortized cost 259,243 273,192
Debt securities, available-for-sale securities, Gross Unrealized Gain 8,905 510
Debt securities, available-for-sale securities, Gross Unrealized Losses 154 4,971
Debt securities - available-for-sale, at fair value: 267,994 268,731
Held-to-maturity securities, Amortized Cost or Cost 853 986
Held-to-maturity securities, Gross Unrealized Gains 20 2
Held-to-maturity securities, Gross Unrealized Losses 0 6
Held-to-maturity securities, fair value 873 982
International    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, at amortized cost 20,331 22,674
Debt securities, available-for-sale securities, Gross Unrealized Gain 373 12
Debt securities, available-for-sale securities, Gross Unrealized Losses 11 411
Debt securities - available-for-sale, at fair value: 20,693 22,275
Held-to-maturity securities, Amortized Cost or Cost 55 55
Held-to-maturity securities, Gross Unrealized Gains 1 0
Held-to-maturity securities, Gross Unrealized Losses 0 1
Held-to-maturity securities, fair value $ 56 $ 54