DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Derivative [Line Items]
Ineffectiveness included in net income	$ 0
Interest expense	4,683,000	$ 6,300,000
Unrealized loss to be reclassified as a reduction of interest expense	0
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Derivative [Line Items]
Notional amount	5,000,000		$ 5,000,000
Interest expense	137,000	$ 169,000	$ 648,000
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap | FHLB Advances
Derivative [Line Items]
Notional amount	$ 40,000,000