ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in Accumulated Other Comprehensive Income (Loss) By Component (Details) - USD ($)	3 Months Ended					9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2016	Sep. 30, 2015
Accumulated other comprehensive income (loss) by component
Balance						$ (6,023,000)
Other comprehensive income before reclassifications, Interest rate swaps	$ 46,000	$ 73,000				122,000	$ 94,000
Accretion of unrealized losses of securities transferred from available-for-sale to held-to-maturity recognized in other comprehensive income	531,000	144,000				779,000	396,000
Net current period other comprehensive (loss) income, Unrealized (gains) losses on securities	(820,000)	1,215,000				2,687,000	933,000
Net current period other comprehensive (loss) income, Pension and postretirement benefit plans	12,000	67,000				162,000	201,000
Balance	(2,273,000)					(2,273,000)
Transferred From Available-For-Sale to Held-To-Maturity
Accumulated other comprehensive income (loss) by component
Transfer of securities from available-for-sale to held-to-maturity				$ 3,530,000	$ 3,530,000
Net current period other comprehensive (loss) income, Unrealized (gains) losses on securities						(1,520,000)
Unrealized Gains (Losses) on Securities | Available for sale
Accumulated other comprehensive income (loss) by component
Balance	3,673,000	1,200,000				166,000	1,482,000
Other comprehensive income before reclassifications, Unrealized (gains) losses on securities	(820,000)	1,215,000				2,687,000	933,000
Net current period other comprehensive (loss) income, Unrealized (gains) losses on securities						2,687,000	933,000
Net current periodic change, Accumulated other comprehensive income (loss)	(820,000)	1,215,000
Balance	2,853,000	2,415,000				2,853,000	2,415,000
Unrealized Gains (Losses) on Securities | Transferred From Available-For-Sale to Held-To-Maturity
Accumulated other comprehensive income (loss) by component
Balance	(2,049,000)	(2,572,000)				(2,297,000)	(2,824,000)
Transfer of securities from available-for-sale to held-to-maturity			$ 8,000
Accretion of unrealized losses of securities transferred from available-for-sale to held-to-maturity recognized in other comprehensive income	531,000	144,000				779,000	396,000
Net current period other comprehensive (loss) income, Unrealized (gains) losses on securities						779,000	396,000
Net current periodic change, Accumulated other comprehensive income (loss)	531,000	144,000
Balance	(1,518,000)	(2,428,000)				(1,518,000)	(2,428,000)
Pension Plan
Accumulated other comprehensive income (loss) by component
Balance	(3,587,000)	(3,261,000)				(3,737,000)	(3,395,000)
Other comprehensive income before reclassifications, Unrealized (gains) losses on securities	(50,000)
Other comprehensive income before reclassifications, Pension and postretirement benefit plans						(50,000)
Reclassification adjustments for (gains) losses reclassified into income	62,000	67,000
Reclassification adjustments for (gains) losses reclassified into income, Pension and postretirement benefit plans							201,000
Reclassification adjustments for (gains) losses reclassified into income, Interest rate swaps						212,000
Net current period other comprehensive (loss) income, Pension and postretirement benefit plans						162,000	201,000
Net current periodic change, Accumulated other comprehensive income (loss)	12,000	67,000
Balance	(3,575,000)	(3,194,000)				(3,575,000)	(3,194,000)
Interest Rate Swaps
Accumulated other comprehensive income (loss) by component
Balance	(79,000)	(290,000)				(155,000)	(311,000)
Other comprehensive income before reclassifications, Unrealized (gains) losses on securities	46,000	73,000
Other comprehensive income before reclassifications, Interest rate swaps						122,000	94,000
Net current period other comprehensive (loss) income, Interest rate swaps						122,000	94,000
Net current periodic change, Accumulated other comprehensive income (loss)	46,000	73,000
Balance	(33,000)	(217,000)				(33,000)	(217,000)
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss) by component
Balance	(2,042,000)	(4,923,000)				(6,023,000)	(5,048,000)
Other comprehensive income before reclassifications, Unrealized (gains) losses on securities	(824,000)	1,288,000
Other comprehensive income before reclassifications, Accumulated other comprehensive income (loss)						2,759,000	1,027,000
Accretion of unrealized losses of securities transferred from available-for-sale to held-to-maturity recognized in other comprehensive income	531,000	144,000				779,000	396,000
Reclassification adjustments for (gains) losses reclassified into income	62,000	67,000
Reclassification adjustments for (gains) losses reclassified into income, Accumulated other comprehensive income (loss)						212,000	201,000
Net current periodic change, Accumulated other comprehensive income (loss)	(231,000)	1,499,000				3,750,000	1,624,000
Balance	$ (2,273,000)	$ (3,424,000)				$ (2,273,000)	$ (3,424,000)