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Intangible Assets (Details 3) (Mortgage Service Rights [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mortgage Service Rights [Member]
     
Changes in mortgage servicing rights      
Balance at beginning of year $ 2,308 $ 2,356 $ 2,021
Re-measurement to fair value upon election to measure servicing rights at fair value 742 0 0
Originated mortgage servicing rights 830 760 1,169
Changes in fair value:      
Due to change in model inputs and assumptions 122 0 0
Other changes in fair value (1,453) 0 0
Amortization 0 (808) (834)
Balance at end of year $ 2,549 $ 2,308 $ 2,356