MARKETABLE SECURITIES - Sale of Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Sale of Marketable Securities [Abstract]
Proceeds	$ 14,762	$ 53,467	$ 14,762	$ 77,087
Gross gains	38	72	38	147
Gross losses	(13)	(91)	(13)	(129)
Held-to-maturity Securities, Sales, Excluding Other than Temporary Impairments [Abstract]
Proceeds from sales	923	0	923	1,866
Amortized cost	907	0	907	1,842
Gross realized gains	16	0	16	24
Tax expense related to securities gains/losses	$ (4)	$ 0	$ (4)	$ (7)