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Mortgage Servicing (Tables)
12 Months Ended
Dec. 31, 2012
Mortgage Servicing [Abstract]  
Schedule of Mortgage Servicing Rights Capitalized and Amortized
    2012   2011   2010
Mortgage Servicing Rights:
                 
Balance at beginning of year   $ 768     $ 898     $ 810  
Capitalized upon sale   153     204     308  
Amortization charged against mortgage servicing fee income   (349 )   (310 )   (235 )
Valuation adjustment   (30 )   (24 )   15  
Balance at end of year   $ 542     $ 768     $ 898  
Valuation Allowance:
                 
Balance at beginning of year   $ (43 )   $ (19 )   $ (34 )
Increase in impairment reserve   (174 )   (33 )   (43 )
Reduction of impairment reserve   144     9     58  
Balance at end of year   $ (73 )   $ (43 )   $ (19 )