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MORTGAGE SERVICING RIGHTS (Tables)
9 Months Ended
Sep. 30, 2011
MORTGAGE SERVICING RIGHTS [Abstract] 
Data and Assumptions Used in Fair Value Calculation
Data and assumptions used in the fair value calculation related to MSRs as of the dates indicated were as follows:


   
September 30,
  
December 31,
 
   
2011
  
2010
  
2010
 
   
(Dollars in thousands)
 
Unpaid principal balance
 $4,143,880  $3,690,125  $3,870,872 
Weighted-average prepayment speed (CPR)
  22.7   23.2   15.6 
Discount rate (annual percentage)
  10.3   10.3   10.3 
Weighted-average coupon interest rate (percentage)
  5.1   5.4   5.2 
Weighted-average remaining maturity (months)
  314.0   318.0   315.0 
Weighted-average servicing fee (basis points)
  28.1   28.6   28.4 
Activity in Class of Mortgage Servicing Assets
The following table presents the activity in this class for the periods indicated:

   
2011
  
2010
 
   
(In thousands)
 
Fair value as of January 1
 $38,642  $35,560 
Additions:
        
   Origination of servicing assets
  7,938   9,173 
Changes in fair value:
        
   Due to payoffs/paydowns
  (4,435)  (4,900)
   Due to change in valuation inputs or assumptions
        
     used in the valuation model
  (12,975)  (12,924)
   Other changes in fair value
  (11)  (8)
Fair value as of September 30
 $29,159  $26,901