Derivative and Hedging Activities - Disclosure of Credit Derivatives (Details) - Foreign currency swaps, net (GBP & EUR) - Not Designated as Hedging Instrument $ in Thousands	Jun. 30, 2015 USD ($) derivative	Dec. 31, 2014 USD ($) derivative
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments | derivative	97	111
Notional Amount	$ 209,121	$ 26,363
GBP | Forwards
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments | derivative	60	80
Notional Amount	$ 10,191	$ 13,664
GBP | Swap
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments | derivative	9	0
Notional Amount	$ 87,952	$ 0
EUR | Forwards
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments | derivative	23	31
Notional Amount	$ 9,419	$ 12,699
EUR | Swap
Schedule of Foreign Currency Swaps [Line Items]
Number of Instruments | derivative	5	0
Notional Amount	$ 101,559	$ 0