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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Thousands
Nov. 05, 2020
Sep. 30, 2020
Derivatives, Fair Value [Line Items]    
Collateral already posted, aggregate fair value   $ 70,900
Interest Rate Swap | Non-hedging interest rate derivatives: | Subsequent Event    
Derivatives, Fair Value [Line Items]    
Derivative, notional amount $ 150,000