Derivative Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ 0	$ 85
Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	1,534	1,272
Included in interest income on loans | Derivatives designated as hedging instruments: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	0	85
Included in interest income on loans | Derivatives not designated as hedging instruments: | Interest rate contracts
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	779	799
Included in other noninterest expense | Derivatives not designated as hedging instruments: | Interest rate contracts
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	0	92
Included in gains on sales of mortgage loans held for sale | Derivatives not designated as hedging instruments: | Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	566	183
Included in gains on sales of mortgage loans held for sale | Derivatives not designated as hedging instruments: | Forward commitments
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ 189	$ 198