DERIVATIVES - Narrative (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) Counterparty	Mar. 31, 2019 USD ($)
Derivative [Line Items]
Number of dealer counterparties | Counterparty	2
Termination value for these net liability positions, which includes accrued interest	$ 17,100,000
Hedge ineffectiveness	0	$ 0
Reclassifications to interest expense	27,000	54,000
Derivative counterparties, posted collateral	17,200,000
Pledged collateral	$ 6,100,000
Obligation to return before cash reclaimed		$ 2,800,000