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Mortgage Servicing Rights (Tables)
3 Months Ended
Mar. 31, 2013
Mortgage Servicing Rights [Abstract]  
Mortgage service rights
A summary of the change in the balance of mortgage servicing assets during the three months ended March 31, 2013 and 2012 were as follows:
 
   
Three Months Ended March 31,
 
   
2013
  
2012
 
   
(in thousands)
 
Beginning balance, at fair value
 $2,306  $2,437 
Servicing rights that result from transfers of financial assets
  217   185 
Changes in fair value:
        
Due to changes in model inputs or assumptions(1)
  135   384 
Other(2)
  (262)  (215)
Ending balance, at fair value
 $2,396  $2,791 
__________________
 
(1) Represents changes in discount rates and prepayment speed assumptions, which are primarily affected by changes in interest rates
 
(2) Represents changes due to collection or realization of expected cash flows over time.
Mortgage service rights assumptions
The key economic assumptions used in determining the fair value of mortgage servicing rights at the dates indicated are as follows:
 
   
At March 31,
 
   
2013
  
2012
 
Prepayment speed (PSA)
  310%  272%
Weighted-average life (years)
  4.5   4.7 
Yield to maturity discount rate
  10.0%  9.0%