DERIVATIVES (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivative [Line Items]
Fair value of derivatives with credit risk contingent feature associated with credit ratings	$ 200,000		$ 200,000
Additional collateral required	0		0
Fair value of derivatives with credit risk contingent features	11,300,000		11,300,000		$ 7,800,000
Collateral posted	36,000,000.0		36,000,000.0		$ 8,600,000
Cash flow hedge loss to be reclassified within next twelve months			32,300,000
Net unrealized gain (loss) on cash flow hedge derivative financial instruments
Derivative [Line Items]
Net amount of change recognized in OCI for cash flow hedge derivatives	7,244,000	$ 4,792,000	155,442,000	$ 13,192,000
Amount reclassified from OCI into earnings for cash flow hedge derivatives	$ 104,000	$ (3,659,000)	$ 211,000	$ (5,055,000)