Derivative Instruments - (Details 1) - Not designated as hedging instruments: - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (1,527)	$ 2,687
Included in interest income on loans | Interest rate contracts
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	533	557
Included in gains on sales of mortgage loans held for sale | Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	1,628	2,705
Included in gains on sales of mortgage loans held for sale | Forward commitments
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (3,688)	$ (575)