ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated other comprehensive loss (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ (1,969)	$ (853)
Change during period:
Before-tax amount		(46)	5
Tax provision/benefit		16	(2)
Reclassification adjustment, net of taxes
Amortization of net loss	[1]	36	17
Net realized gain	[2]	44	5
Total activity for the period		50	25
Balance		(1,919)	(828)
Pension Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ (2,024)	$ (990)
Change during period:
Before-tax amount
Tax provision/benefit
Reclassification adjustment, net of taxes
Amortization of net loss	[1]	$ 36	$ 17
Net realized gain	[2]
Total activity for the period		$ 36	$ 17
Balance		(1,988)	(973)
Unrealized Gain on Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		55	137
Change during period:
Before-tax amount		(46)	5
Tax provision/benefit		$ 16	$ (2)
Reclassification adjustment, net of taxes
Amortization of net loss	[1]
Net realized gain	[2]	$ 44	$ 5
Total activity for the period		14	8
Balance		$ 69	$ 145

[1] Reported as part of selling, general and administrative expenses.

[2] Reported as part of interest income.