Derivative Instruments - (Details 1) - Not designated as hedging instruments: - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ 1,582	$ 1,060	$ 4,269	$ 2,594
Included in interest income on loans | Interest rate contracts
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	544	767	1,101	1,546
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	(1,248)	927	1,457	1,493
Included in gains on sales of mortgage loans held for sale | Forward commitments
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ 2,286	$ (634)	$ 1,711	$ (445)