FAIR VALUE - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Additional provision for loan losses	$ 1,000	$ 200	$ 5,100	$ 1,400
Assets measured at fair value on non-recurring basis
Outstanding balance of impaired loans with an allowance recorded	11,975		11,975		$ 2,721
Valuation allowance on impaired loans	4,689		4,689		189
Other Real Estate	0		0		175
Other real estate owned valuation allowance	0		0		0
Real estate owned additional provision			0		0
Non-recurring basis
Assets measured at fair value on non-recurring basis
Outstanding balance of impaired loans with an allowance recorded	12,000		12,000		2,700
Valuation allowance on impaired loans	4,700		4,700		200
Carrying Amount | Non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of impaired loans	7,286		7,286		2,532
Assets measured at fair value on non-recurring basis
Valuation allowance on impaired loans	$ 0		$ 0
Other Real Estate					$ 175