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MORTGAGE SERVICING RIGHTS (Tables)
12 Months Ended
Dec. 31, 2012
MORTGAGE SERVICING RIGHTS [Abstract]  
Data and Assumptions Used in Fair Value Calculation
MSRs, which are recognized as a separate asset on the date the corresponding mortgage loan is sold, are recorded at fair value as determined at each accounting period end.  An estimate of the fair value of the Company's MSRs is determined utilizing assumptions about factors such as mortgage interest rates, discount rates, mortgage loan prepayment speeds, market trends and industry demand.  Data and assumptions used in the fair value calculation related to MSRs for the years ended December 31, 2012, 2011 and 2010 were as follows:
 
   
2012
  
2011
  
2010
 
   
(Dollars in thousands)
 
Unpaid principal balance
 $5,058,912  $4,293,552  $3,870,872 
Weighted-average prepayment speed (CPR)
  17.1   22.7   15.6 
Discount rate (annual percentage)
  10.8   10.3   10.3 
Weighted-average coupon interest rate (percentage)
  4.4   4.9   5.2 
Weighted-average remaining maturity (months)
  307.0   311.0   315.0 
Weighted-average servicing fee (basis points)
  27.1   28.0   28.4 
Activity in Class of Mortgage Servicing Assets
The Company has one class of mortgage servicing asset comprised of closed end loans for one-to-four family residences, secured by first liens.  The following table presents the activity in this class for the years indicated:
   
2012
  
2011
 
   
(In thousands)
 
Fair value at beginning of year
 $30,174  $38,642 
Additions:
        
   Origination of servicing assets
  18,531   11,692 
Changes in fair value:
        
   Due to payoffs/paydowns
  (7,649)  (6,180)
Due to change in valuation inputs or assumptions used in the valuation model
  (3,163)  (13,966)
   Other changes in fair value
  (11)  (14)
Fair value at end of year
 $37,882  $30,174