DERIVATIVES AND HEDGING ACTIVITIES - Effect on Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Effect of cash flow hedge accounting on Accumulated Other Comprehensive Income (Loss):
Gain (loss) recognized in other comprehensive income	$ 225	$ 100	$ 3,767	$ (25,098)
Gain recognized on termination of derivatives			(16,505)
Interest Rate Products | Other Comprehensive Income
Effect of cash flow hedge accounting on Accumulated Other Comprehensive Income (Loss):
Gain (loss) recognized in other comprehensive income	225	100	3,767	(25,098)
Interest Rate Products | Other Comprehensive Income | Interest Expense
Effect of cash flow hedge accounting on Accumulated Other Comprehensive Income (Loss):
Loss reclassified from other comprehensive income into interest expense	$ (38)	$ (2,319)	(902)	$ (3,679)
Interest Rate Products | Other Comprehensive Income | Derivatives.
Effect of cash flow hedge accounting on Accumulated Other Comprehensive Income (Loss):
Gain recognized on termination of derivatives			$ 16,505