ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Changes in Accumulated Other Comprehensive Income or Loss by Component (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]
Balances			$ 137,242	$ 133,628
Net current period other comprehensive gain (loss)	$ (270)	$ 828	3,137	499
Balances	144,812	138,715	144,812	138,715
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]
Balances	(7,535)	(9,114)	(10,942)	(8,785)
Other comprehensive income before reclassification	(456)	598	3,051	2
Amounts reclassified from accumulated other comprehensive income	186	230	86	497
Net current period other comprehensive gain (loss)	(270)	828	3,137	499
Balances	(7,805)	(8,286)	(7,805)	(8,286)
Unrealized Gains and Losses on Securities Available for Sale [Member]
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]
Balances	3,152	1,184	210	1,960
Other comprehensive income before reclassification	(456)	598	3,051	2
Amounts reclassified from accumulated other comprehensive income	(47)	7	(612)	(173)
Net current period other comprehensive gain (loss)	(503)	605	2,439	(171)
Balances	2,649	1,789	2,649	1,789
Defined Benefit and Other Benefit Plans [Member]
Changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]
Balances	(10,687)	(10,298)	(11,152)	(10,745)
Other comprehensive income before reclassification	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	233	223	698	670
Net current period other comprehensive gain (loss)	233	223	698	670
Balances	$ (10,454)	$ (10,075)	$ (10,454)	$ (10,075)