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Derivatives and Hedging Activities - Schedule of Interest Rate Derivatives (Details) - Designated as Hedging Instrument - Cash Flow Hedging - Swap
$ in Thousands
Jun. 30, 2019
USD ($)
derivative
Dec. 31, 2018
USD ($)
derivative
Derivative [Line Items]    
Number of Instruments | derivative 68 64
Notional Amount | $ $ 631,403 $ 596,567
GBP    
Derivative [Line Items]    
Number of Instruments | derivative 48 48
Notional Amount | $ $ 233,630 $ 234,312
EUR    
Derivative [Line Items]    
Number of Instruments | derivative 17 13
Notional Amount | $ $ 247,773 $ 212,255
USD    
Derivative [Line Items]    
Number of Instruments | derivative 3 3
Notional Amount | $ $ 150,000 $ 150,000