OTHER COMPREHENSIVE LOSS - Summary of the Tax Effects (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive loss, before tax	$ (2,238)	$ (761)
Total other comprehensive loss, tax effect	0	267
Total other comprehensive loss, net of tax	(2,238)	(494)
Securities available-for-sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications and tax	(2,335)	(503)
Other comprehensive income (loss), before reclassifications, tax effect	0	176
Other comprehensive income (loss), before reclassifications, net of tax	(2,335)	(327)
Securities available-for-sale, reclassification adjustment for securities transferred from held-to-maturity to available-for-sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment, before tax	58	0
Reclassification adjustment, tax effect	0	0
Reclassification adjustment, net of tax	58	0
Securities available-for-sale, reclassification adjustment for net (gains) losses included in net income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment, before tax	49	(347)
Reclassification adjustment, tax effect	0	122
Reclassification adjustment, net of tax	49	(225)
Derivative instruments designated as cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications and tax	257	106
Other comprehensive income (loss), before reclassifications, tax effect	0	(37)
Other comprehensive income (loss), before reclassifications, net of tax	257	69
Reclassification adjustment, before tax	(267)	(17)
Reclassification adjustment, tax effect	0	6
Reclassification adjustment, net of tax	(267)	(11)
Total other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive loss, before tax	(2,238)	(761)
Total other comprehensive loss, tax effect	0	267
Total other comprehensive loss, net of tax	$ (2,238)	$ (494)