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Derivative Financial Instruments (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Recognized derivative income included in other noninterest income        
Derivative income $ 205 $ 128 $ 555 $ 326