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Intangible Assets (Details 2) (Mortgage Service Rights [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mortgage Service Rights [Member]
   
Changes in mortgage servicing rights    
Balance at beginning of year $ 2,549 $ 2,308
Re-measurement to fair value upon election to measure servicing rights at fair value 0 742
Originated mortgage servicing rights 197 182
Changes in fair value:    
Due to change in model inputs and assumptions 194 170
Other changes in fair value (251) (655)
Balance at end of year $ 2,689 $ 2,747