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DERIVATIVES - Interest Rate Swaps Designated as Cash Flow Hedges (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Derivatives    
Notional amounts $ 1,000,000 $ 823,900
Interest rate swaps | Derivative designated as a cash flow hedge    
Derivatives    
Notional amounts $ 405,000 $ 290,000
Weighted average pay rates (as a percent) 1.48% 1.84%
Weighted average receive rates (as a percent) 0.63% 1.94%
Weighted average maturity 3 years 1 month 2 days 2 years 10 months 28 days