INVESTMENTS (Amortized Cost and Aggregate Fair Value of Debt Securities, by Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Investments [Abstract]
Available-for-sale Securities, Due in one year or less, Amortized Cost	$ 1,089
Available-for-sale Securities, Due in one year or less, Fair Value	1,093
Available-for-sale Securities, Due after one year through five years, Amortized Cost	19,620
Available-for-sale Securities, Due after one year through five years, Fair Value	19,538
Available-for-sale Securities, Due after five years through ten years, Amortized Cost	27,204
Available-for-sale Securities, Due after five years through ten years, Fair Value	26,801
Available-for-sale Securities, Due after ten years, Amortized Cost	52,283
Available-for-sale Securities, Due after ten years, Fair Value	50,787
Available-for-sale securities, Amortized Cost	100,196	$ 94,467
Available-for-sale Securities, Fair Value	98,219
Held-to-maturity Securities, Due in one year or less, Amortized Cost	0
Held-to-maturity Securities, Due in one year or less, Fair Value	0
Held-to-maturity Securities, Due after one year through five years, Amortized Cost	47
Held-to-maturity Securities, Due after one year through five years, Fair Value	49
Held-to-maturity Securities, Due after five years through ten years, Amortized Cost	0
Held-to-maturity Securities, Due after five years through ten years, Fair Value	0
Held-to-maturity Securities, Due after ten years, Amortized Cost	1,435
Held-to-maturity Securities, Due after ten years, Fair Value	1,405
Held-to-maturity Securities, Amortized Cost	1,482	1,616
Held-to-maturity Securities, Fair Value	$ 1,454	$ 1,645