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Derivatives and Hedging Activities - Derivatives in Fair Value Hedging Relationships (Details 1) (Fair value hedging of interest rate risk, Other fee revenue, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Fair value hedging of interest rate risk | Other fee revenue
   
Effect of fair value hedging derivative financial instruments on the consolidated statement of operations    
Location of Gain (Loss) Recognized in Income on Derivative Other fee revenue Other fee revenue
Amount of Gain (Loss) Recognized in Income on Derivative $ (2,076) $ (1,264)
Amount of Gain (Loss) Recognized in Income on Hedged Item $ 1,990 $ 1,298