DERIVATIVE INSTRUMENTS (Decrease in Reported Notional Amount) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Balance, January 1, 2019	$ 202,609
Balance, March 31, 2019	141,248
Interest derivative instruments and total return swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Balance, January 1, 2019	198,278
Impact from expirations	(45,000)
Impact from terminations	(16,528)
Impact from settlements	(36)
Balance, March 31, 2019	$ 136,714