ACCUMULATED OTHER COMPREHENSIVE LOSS - Components of AOCL (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ (9,162)	$ (6,127)	$ (6,487)
Other comprehensive (loss) income before reclassification	7,352	(2,589)	468
Amounts reclassified from accumulated other comprehensive loss	17	40	(108)
Total other comprehensive income (loss)	7,369	(2,549)	360
Reclassification of certain tax effects from accumulated other comprehensive loss		(486)
Ending balance	(1,793)	(9,162)	(6,127)
(Losses) and Gains on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(393)	(571)	(695)
Other comprehensive (loss) income before reclassification	(133)	178	124
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Total other comprehensive income (loss)	(133)	178	124
Reclassification of certain tax effects from accumulated other comprehensive loss		0
Ending balance	(526)	(393)	(571)
Unrealized (Losses) and Gains on Securities | Available-for-sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(8,705)	(5,460)	(5,319)
Other comprehensive (loss) income before reclassification	7,467	(2,799)	(33)
Amounts reclassified from accumulated other comprehensive loss	17	40	(108)
Total other comprehensive income (loss)	7,484	(2,759)	(141)
Reclassification of certain tax effects from accumulated other comprehensive loss		(486)
Ending balance	(1,221)	(8,705)	(5,460)
Unrealized (Losses) and Gains on Securities | Held-to-maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(64)	(96)	(473)
Other comprehensive (loss) income before reclassification	18	32	377
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Total other comprehensive income (loss)	18	32	377
Reclassification of certain tax effects from accumulated other comprehensive loss		0
Ending balance	$ (46)	$ (64)	$ (96)