INTEREST RATE SWAPS (Details) - Interest rate swap - Cash flow hedge $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 item
Derivative [Line Items]
Number of derivative agreements | item			2
Summary information about interest rate swaps
Notional amount	$ 20,000
(Liabilities)	(908)	$ (488)
Unrealized gain (loss) in accumulated OCI	(590)	(316)
1-month LIBOR
Summary information about interest rate swaps
Notional amount	$ 10,000
Pay rate (as a percent)	2.17%
(Liabilities)	$ (434)	(232)
Unrealized gain (loss) in accumulated OCI	(282)	(150)
3-month LIBOR
Summary information about interest rate swaps
Notional amount	$ 10,000
Pay rate (as a percent)	2.33%
(Liabilities)	$ (474)	(256)
Unrealized gain (loss) in accumulated OCI	$ (308)	$ (166)