Derivatives and Hedging Activities - Disclosure of Credit Derivatives (Details) - Not Designated as Hedging Instrument - Swap $ in Thousands	Sep. 30, 2016 USD ($) derivative	Dec. 31, 2015 USD ($) derivative
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments (derivative) | derivative	49	69
Notional Amount | $	$ 233,445	$ 195,457
Foreign currency forwards, net (GBP & EUR) | GBP
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments (derivative) | derivative	23	40
Notional Amount | $	$ 18,851	$ 6,628
Foreign currency forwards, net (GBP & EUR) | EUR
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments (derivative) | derivative	15	15
Notional Amount | $	$ 28,219	$ 6,139
Cross currency swaps, net (GBP & EUR) | GBP
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments (derivative) | derivative	4	9
Notional Amount | $	$ 48,136	$ 82,843
Cross currency swaps, net (GBP & EUR) | EUR
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments (derivative) | derivative	5	5
Notional Amount | $	$ 102,632	$ 99,847
Interest rate swaps, net | EUR
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments (derivative) | derivative	2	0
Notional Amount | $	$ 35,607	$ 0