Derivative Instruments - (Details 1) - Not designated as hedging instruments: - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (97)	$ 949	$ 4,172	$ 3,543
Included in interest income on loans | Interest rate contracts
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	576	750	1,677	2,296
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	2,326	(261)	3,783	1,232
Included in gains on sales of mortgage loans held for sale | Forward commitments
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (2,999)	$ 460	$ (1,288)	$ 15