Derivative Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Derivatives designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Deferred Gains Amortized Into Net Interest Income	$ 80	$ 152	$ 165	$ 304
Derivatives not designated as hedging instruments [Member]
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income
Gains (losses) on derivative financial instruments	3,170	607	4,442	496
Included in interest income on loans [Member] | Derivatives designated as hedging instruments [Member] | Interest rate swaps [Member]
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income
Gains (losses) on derivative financial instruments	80	152	165	304
Included in interest income on loans [Member] | Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member]
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income
Gains (losses) on derivative financial instruments	801	549	1,600	883
Included in other noninterest expense [Member] | Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member]
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income
Gains (losses) on derivative financial instruments	(25)	23	67	34
Included in gains on sales of mortgage loans held for sale [Member] | Derivatives not designated as hedging instruments [Member] | Interest rate lock commitments [Member]
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income
Gains (losses) on derivative financial instruments	(2,284)	923	(2,101)	522
Included in gains on sales of mortgage loans held for sale [Member] | Derivatives not designated as hedging instruments [Member] | Forward commitments [Member]
Gains (losses) on derivatives financial instruments included in the Consolidated Statements of Income
Gains (losses) on derivative financial instruments	$ 4,678	$ (888)	$ 4,876	$ (943)