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Derivatives and Hedging Activities - Narrative (Details) - Interest rate swaps
$ in Millions
Mar. 31, 2020
USD ($)
contract
Dec. 31, 2019
USD ($)
contract
Fair value hedging of interest rate risk    
Derivative Instruments, Gain (Loss) [Line Items]    
Number of derivative contracts outstanding 3 4
Aggregate notional amount | $ $ 27.9 $ 37.9
Not designated as hedging instrument, economic hedge    
Derivative Instruments, Gain (Loss) [Line Items]    
Number of derivative contracts outstanding 3