DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative [Line Items]
Swaps cancellation expenses	$ 19,287,000	$ 16,758,000	$ 54,302,000	$ 48,349,000
Interest expense	1,665,000	$ 2,677,000	5,494,000	10,759,000
Unrealized loss to be reclassified as a reduction of interest expense			0
Interest Rate Swap
Derivative [Line Items]
Notional amount	5,000,000		5,000,000
Swaps cancellation expenses			466,000
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Derivative [Line Items]
Interest expense			483,000	$ 509,000
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap | FHLB Advances
Derivative [Line Items]
Notional amount	$ 40,000,000		$ 40,000,000		$ 40,000,000