Derivative Financial Instruments - Derivatives not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Asset Derivatives | Interest rate lock commitments
Derivatives not designated as hedging instruments	$ (290)	$ 277	$ 102	$ 368
Liability Derivatives | Forward contracts
Derivatives not designated as hedging instruments	0	(342)	0	(537)
Liability Derivatives | Interest rate lock commitments
Derivatives not designated as hedging instruments	$ 642	$ 0	$ 645	$ 0