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MORTGAGE SERVICING RIGHTS (Tables)
 3 Months Ended
Mar. 31, 2022
MORTGAGE SERVICING RIGHTS [Abstract]  
Change in Fair Value of Mortgage Servicing Rights Asset and Other Information
The following table reflects the changes in fair value of the Company’s mortgage servicing rights asset included in the Consolidated Balance Sheets, and other information related to the serviced portfolio, for the periods or dates presented (dollars in thousands):

   
Three Months Ended
March 31,
  
   
2022
    
2021
  
Beginning balance
  
$
19,700
    
$
9,049
  
Additions
    
1,250
      
3,222
  
Valuation adjustment
    
4,475
      
1,287
  
Ending balance
  
$
25,425
    
$
13,558
  
                 
    March 31,
    December 31,
 
      2022
       2021
  
Mortgage loans serviced for others
  
$
2,028,339
    
$
1,953,095
  
Mortgage servicing rights assets as a percentage of serviced mortgage loans
    
1.25
%
    
1.01
%
Key Assumptions Used in Measuring Fair Value of Mortgage Servicing Rights
The following table reflects the key assumptions used in measuring the fair value of the Company's mortgage servicing rights as of the dates indicated:

   
March 31,
    
December 31,
  
   
2022
    
2021
  
Weighted average constant prepayment rate
    
8.48
%
    
12.35
%
Weighted average discount rate
    
8.63
%
    
9.14
%
Weighted average life in years
    
7.49
      
6.03