Derivative Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Designated as hedging instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ 0	$ 80	$ 0	$ 165
Not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	1,060	3,170	2,594	4,442
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	80	0	165
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	767	801	1,546	1,600
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	(25)	0	67
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	927	(2,284)	1,493	(2,101)
Included in gains on sales of mortgage loans held for sale | Not designated as hedging instruments: | Forward contracts
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (634)	$ 4,678	$ (445)	$ 4,876