Derivative Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivatives designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Deferred Gains Amortized Into Net Interest Income	$ 37	$ 115	$ 203	$ 419
Derivatives not designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	106	(970)	4,547	(473)
Included in interest income on loans [Member] | Derivatives designated as hedging instruments [Member] | Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	37	115	203	419
Included in interest income on loans [Member] | Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member]
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	798	583	2,398	1,466
Included in other noninterest expense | Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member]
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	2	(14)	69	20
Included in gains on sales of mortgage loans held for sale [Member] | Derivatives not designated as hedging instruments [Member] | Interest rate lock commitments [Member]
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	2,905	1,145	804	1,667
Included in gains on sales of mortgage loans held for sale [Member] | Derivatives not designated as hedging instruments [Member] | Forward commitments [Member]
Derivatives, Fair Value [Line Items]
Gains (losses) on derivative financial instruments	$ (3,599)	$ (2,684)	$ 1,276	$ (3,626)