DERIVATIVES AND HEDGING ACTIVITIES - Effect on Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Effect of cash flow hedge accounting on Accumulated Other Comprehensive Income (Loss):
(Loss) gain recognized in other comprehensive income	$ (1,406)	$ (4,617)	$ 3,542	$ (25,198)
Gain recognized on termination of derivatives			(16,505)
Interest Rate Products [Member] | Other Comprehensive Income
Effect of cash flow hedge accounting on Accumulated Other Comprehensive Income (Loss):
(Loss) gain recognized in other comprehensive income	(1,406)	(4,617)	3,542	(25,198)
Interest Rate Products [Member] | Other Comprehensive Income | Interest Expense
Effect of cash flow hedge accounting on Accumulated Other Comprehensive Income (Loss):
Gain (loss) reclassified from other comprehensive income into interest expense	$ (10)	$ (1,156)	(864)	$ (1,360)
Interest Rate Products [Member] | Other Comprehensive Income | Derivatives
Effect of cash flow hedge accounting on Accumulated Other Comprehensive Income (Loss):
Gain recognized on termination of derivatives			$ 16,505