FAIR VALUE - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional provision for loan losses	$ 600	$ 800
Assets measured at fair value on non-recurring basis
Outstanding balance of impaired loans with an allowance recorded	4,259		$ 2,721
Valuation allowance on impaired loans	299		189
Other Real Estate	175		175
Other real estate owned valuation allowance	0		0
Real estate owned additional provision	0		0
Non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional provision for loan losses	100		200
Assets measured at fair value on non-recurring basis
Outstanding balance of impaired loans with an allowance recorded	4,300		2,700
Valuation allowance on impaired loans	300		200
Carrying Amount | Non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of impaired loans	3,960		2,532
Assets measured at fair value on non-recurring basis
Other Real Estate	$ 175		$ 175