INVESTMENT SECURITIES - Securities with unrealized losses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	$ 2,438	$ 1,782
Less than 12 months, Unrealized Losses	(34)	(12)
More than 12 months, Fair Value	39,764	40,276
More than 12 months, Unrealized Losses	(1,038)	(2,027)
Total Fair Value	42,202	42,058
Total Unrealized Losses	(1,072)	(2,039)
Sales	0	0
Association (“GNMA”) mortgage-backed securities – residential
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	32	201
More than 12 months, Fair Value	32,211	32,696
More than 12 months, Unrealized Losses	(802)	(1,597)
Total Fair Value	32,243	32,897
Total Unrealized Losses	(802)	(1,597)
Federal National Mortgage Association (“FNMA”) mortgage-backed securities – residential
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value		436
Less than 12 months, Unrealized Losses		(3)
More than 12 months, Fair Value	3,089	3,215
More than 12 months, Unrealized Losses	(111)	(205)
Total Fair Value	3,089	3,651
Total Unrealized Losses	(111)	(208)
Securities issued by U.S. government sponsored entities and agencies
Debt Securities, Available-for-sale [Line Items]
More than 12 months, Fair Value	4,400	4,302
More than 12 months, Unrealized Losses	(124)	(223)
Total Fair Value	4,400	4,302
Total Unrealized Losses	(124)	(223)
Corporate collateralized mortgage obligations and mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	2,406	1,145
Less than 12 months, Unrealized Losses	(34)	(9)
More than 12 months, Fair Value	64	63
More than 12 months, Unrealized Losses	(1)	(2)
Total Fair Value	2,470	1,208
Total Unrealized Losses	$ (35)	$ (11)