ACCUMULATED OTHER COMPREHENSIVE INCOME/LOSS ("AOCI") (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				$ 197,258				$ 182,733	$ 197,258	$ 182,733
Other comprehensive loss before reclassifications									(2,080)	(2,101)
Amounts reclassified from AOCI									1,137	368
Net other comprehensive (loss) income									(943)	(1,733)
Ending Balance	$ 215,028				$ 197,258				215,028	197,258	$ 182,733
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net gain on sale of securities available for sale									617	319	19
Interest income - U.S. Government agency obligations									676	2,079	2,320
Subtotal, pre-tax									27,453	23,573	19,015
Income tax expense	(1,369)	$ (2,118)	$ (2,159)	(1,976)	(1,202)	$ (1,864)	$ (1,579)	(1,241)	(7,622)	(5,886)	(3,720)
NET INCOME	3,733	$ 5,475	$ 5,785	4,838	3,637	$ 4,923	$ 5,118	4,009	19,831	17,687	15,295
Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Subtotal, pre-tax									(1,887)	(590)	(224)
Income tax expense									750	222	88
NET INCOME									(1,137)	(368)	(136)
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				(8,576)				(6,843)	(8,576)	(6,843)	(7,289)
Ending Balance	(9,519)				(8,576)				(9,519)	(8,576)	(6,843)
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				1,436				2,637	1,436	2,637
Other comprehensive loss before reclassifications									(970)	(1,010)
Amounts reclassified from AOCI									(364)	(191)
Net other comprehensive (loss) income									(1,334)	(1,201)
Ending Balance	102				1,436				102	1,436	2,637
Unrealized Gains and Losses on Available-for-Sale Securities [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net gain on sale of securities available for sale									617	319	19
Unrealized Losses on Securities Transferred from Available for Sale to Held to Maturity [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				(1,395)				(1,805)	(1,395)	(1,805)
Other comprehensive loss before reclassifications									0	0
Amounts reclassified from AOCI									1,324	410
Net other comprehensive (loss) income									1,324	410
Ending Balance	(71)				(1,395)				(71)	(1,395)	(1,805)
Unrealized Losses on Securities Transferred from Available for Sale to Held to Maturity [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest income - U.S. Government agency obligations									(2,205)	(660)	(218)
Pension and Post-Retirement Plan Items [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				$ (8,617)				$ (7,675)	(8,617)	(7,675)
Other comprehensive loss before reclassifications									(1,110)	(1,091)
Amounts reclassified from AOCI									177	149
Net other comprehensive (loss) income									(933)	(942)
Ending Balance	$ (9,550)				$ (8,617)				(9,550)	(8,617)	(7,675)
Pension and Post-Retirement Plan Items [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Employee compensation and benefits									$ (299)	$ (249)	$ (25)