FAIR VALUE - Fair Value of Foreclosed Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Carrying Value | Other real estate owned remeasured at initial recognition
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	$ 130	$ 542	$ 41
Carrying Value | Other real estate owned remeasured subsequent to initial recognition
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	0	599	0
Charge-offs | Other real estate owned remeasured at initial recognition
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	(6)	(25)	(14)
Charge-offs | Other real estate owned remeasured subsequent to initial recognition
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	0	(56)	0
Fair Value | Other real estate owned remeasured at initial recognition
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	124	517	27
Fair Value | Other real estate owned remeasured subsequent to initial recognition
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	$ 0	$ 543	$ 0