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Mortgage Servicing Rights (Tables)
3 Months Ended
Mar. 31, 2013
Mortgage Servicing Rights [Abstract]  
Fair value of mortgage servicing rights
                 
    Three months ended March 31,  
    2013     2012  

Mortgage servicing rights:

               

Balance at beginning of period

  $ 4,552     $ 4,603  

Additions

    493       550  

Change in fair value

    (61     (369
   

 

 

   

 

 

 

Balance at end of period

  $ 4,984     $ 4,784  
   

 

 

   

 

 

 

Servicing, late and ancillary fees received

  $ 417     $ 372  

Balance of loans serviced at:

               

Beginning of period

  $ 666,512     $ 598,185  

End of period

  $ 680,447     $ 615,867  

Weighted-average prepayment speed (CPR)

    17.3     18.4

Discount rate

    10.0     9.0