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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
settled_derivative
Dec. 31, 2019
USD ($)
settled_derivative
Dec. 31, 2018
USD ($)
Derivative [Line Items]      
Agreements settled | settled_derivative 0    
Interest income $ 2,368 $ 9,797 $ 8,486
Proceeds from derivative settlement 0 0 $ 16,104
Fair value derivative liabilities 51,920 $ 40,135  
Interest Rate Swap      
Derivative [Line Items]      
Gain reclassification to interest expense 3,200    
Interest Rate Cap      
Derivative [Line Items]      
Agreements settled | settled_derivative   1  
Credit Risk Contract      
Derivative [Line Items]      
Fair value derivative liabilities 54,600 $ 41,600  
Designated as Hedging Instrument | Interest Rate Swap      
Derivative [Line Items]      
Interest income   200  
Proceeds from derivative settlement   200  
Interest rate cash flow hedge loss to be reclassified during next 12 months $ 25,100    
Designated as Hedging Instrument | Interest Rate Cap      
Derivative [Line Items]      
Notional amount, asset   $ 230,000  
Designated as Hedging Instrument | Settled Interest Rate Swap, One | Interest Rate Swap      
Derivative [Line Items]      
Change in fair value, recognition period 7 years    
Designated as Hedging Instrument | Settled Interest Rate Swap, Two | Interest Rate Swap      
Derivative [Line Items]      
Change in fair value, recognition period 8 months 12 days