FAIR VALUE - Fair Value of Foreclosed Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	$ 147	$ 542	$ 1,082
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	35	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	(11)	(25)	(195)
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	(10)	(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	136	517	887
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	$ 25	$ 543	$ 0