Derivative Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Designated as hedging instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ 0	$ 37	$ 0	$ 203
Not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	949	106	3,543	4,547
Included in interest income on loans | Designated as hedging instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	0	37	0	203
Included in interest income on loans | Not designated as hedging instruments: | Interest rate contracts
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	750	798	2,296	2,398
Included in other noninterest expense | Not designated as hedging instruments: | Interest rate contracts
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	0	2	0	69
Included in gains on sales of mortgage loans held for sale | Not designated as hedging instruments: | Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	(261)	2,905	1,232	804
Included in gains on sales of mortgage loans held for sale | Not designated as hedging instruments: | Forward commitments
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ 460	$ (3,599)	$ 15	$ 1,276