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Derivatives and Hedging Activities - Disclosure of Credit Derivatives (Details) - Not Designated as Hedging Instrument - Swap
$ in Thousands
Jun. 30, 2017
USD ($)
derivative
Dec. 31, 2016
USD ($)
derivative
Schedule of Foreign Currency Swaps [Line Items]    
Number of Instruments (derivative) | derivative 53 62
Notional Amount | $ $ 213,549 $ 257,738
Foreign currency forwards, net (GBP & EUR) | GBP    
Schedule of Foreign Currency Swaps [Line Items]    
Number of Instruments (derivative) | derivative 19 21
Notional Amount | $ $ 20,348 $ 18,058
Foreign currency forwards, net (GBP & EUR) | EUR    
Schedule of Foreign Currency Swaps [Line Items]    
Number of Instruments (derivative) | derivative 16 20
Notional Amount | $ $ 23,568 $ 28,424
Cross currency swaps, net (GBP & EUR) | GBP    
Schedule of Foreign Currency Swaps [Line Items]    
Number of Instruments (derivative) | derivative 0 3
Notional Amount | $ $ 0 $ 43,457
Cross currency swaps, net (GBP & EUR) | EUR    
Schedule of Foreign Currency Swaps [Line Items]    
Number of Instruments (derivative) | derivative 1 3
Notional Amount | $ $ 15,339 $ 30,604
Interest rate swaps, net | EUR    
Schedule of Foreign Currency Swaps [Line Items]    
Number of Instruments (derivative) | derivative 5 5
Notional Amount | $ $ 138,519 $ 127,570
Put options (GBP & EUR) | GBP    
Schedule of Foreign Currency Swaps [Line Items]    
Number of Instruments (derivative) | derivative 3 5
Notional Amount | $ $ 2,025 $ 3,375
Put options (GBP & EUR) | EUR    
Schedule of Foreign Currency Swaps [Line Items]    
Number of Instruments (derivative) | derivative 9 5
Notional Amount | $ $ 13,750 $ 6,250