DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Ineffectiveness included in net income	$ 0	$ 0
Interest expense	13,060,000	23,691,000	$ 19,542,000
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	747,000	$ 648,000	$ 687,000
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap | FHLB Advances
Derivative [Line Items]
Notional amount	$ 40,000