FAIR VALUE - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional provision for loan losses	$ 600	$ 1,000	$ 3,500	$ 600	$ 400	$ 200	$ 400	$ 800	$ 5,700	$ 1,800	$ 14,050
Assets measured at fair value on non-recurring basis
Outstanding balance of impaired loans with an allowance recorded	11,657				2,721				11,657	2,721	1,708
Valuation allowance on impaired loans	4,676				189				4,676	189	$ 1,708
Other Real Estate					175					175
Real estate owned additional provision										0
Non-recurring basis
Assets measured at fair value on non-recurring basis
Outstanding balance of impaired loans with an allowance recorded					2,700					2,700
Valuation allowance on impaired loans					200					200
Carrying Amount
Assets measured at fair value on non-recurring basis
Loans held for sale	12,643								12,643
Carrying Amount | Non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of impaired loans	6,981				2,532				6,981	2,532
Assets measured at fair value on non-recurring basis
Loans held for sale	$ 12,643								$ 12,643
Other Real Estate					$ 175					$ 175