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Mortgage Servicing Rights (Tables)
6 Months Ended
Jun. 30, 2012
Mortgage Servicing Rights [Abstract]  
Fair value of mortgage servicing rights
                                 
    Three months ended June 30,     Six months ended June 30,  
    2012     2011     2012     2011  

Mortgage servicing rights:

                               

Balance at beginning of period

  $ 4,784     $ 4,808     $ 4,603     $ 4,605  

Additions

    437       172       987       435  

Change in fair value

    (464     (162     (833     (222
   

 

 

   

 

 

   

 

 

   

 

 

 

Balance at end of period

  $ 4,757     $ 4,818     $ 4,757     $ 4,818  
   

 

 

   

 

 

   

 

 

   

 

 

 

Servicing, late and ancillary fees received

  $ 379     $ 370     $ 751     $ 731  

Balance of loans serviced at:

                               

Beginning of period

  $ 615,867     $ 583,625     $ 598,185     $ 573,300  

End of period

  $ 628,674     $ 584,113     $ 628,674     $ 584,113  

Weighted-average prepayment speed (CPR)

                    18.5     14.5

Discount rate

                    9.0     9.0