Derivative Instruments - (Details 1) - Not designated as hedging instruments: - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (2,337)	$ (1,527)
Interest rate contracts | Included in interest income on loans
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	679	533
Interest rate lock commitments | Included in gains on sales of mortgage loans held for sale
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	2,853	1,628
Forward commitments | Included in gains on sales of mortgage loans held for sale
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (5,869)	$ (3,688)