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Derivative Instruments and Hedging Activity - Interest Rate Derivatives (Details) - Interest rate swap
$ in Thousands
Sep. 30, 2020
USD ($)
DerivativeInstrument
Dec. 31, 2019
USD ($)
DerivativeInstrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Interest Rate Derivatives, Number of Instruments | DerivativeInstrument 14 15
Interest Rate Derivatives, Notional Amount | $ $ 405,000 $ 440,000