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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill
The following table presents the changes in the carrying amount of goodwill for the periods presented.
 
 
  
Year Ended December 31,
 
 
  
          2020          
 
  
          2019          
 
 
  
(Dollars in thousands)
 
Balance, beginning of period
    $ 663,707      $ 666,539  
Purchase accounting adjustments
      -        (2,832 ) 
    
 
 
     
 
 
  
Balance, end of period
    $ 663,707      $ 663,707  
    
 
 
     
 
 
  
Summary of Amortizable Intangible Assets
The following summarizes changes in CDI and the related accumulated amortization for the periods presented.
 
 
 
Year Ended December 31,
 
 
 
2020
 
 
2019
 
 
 
  Gross CDI  
 
 
  Accumulated  
 
 
  Net CDI  
 
 
  Gross CDI  
 
 
  Accumulated  
 
 
  Net CDI  
 
 
 
Amount
 
 
Amortization
 
 
Amount
 
 
Amount
 
 
Amortization
 
 
Amount
 
 
 
(Dollars in thousands)
 
Balance of intangible assets, beginning of period
  
$
 93,297
 
  
$
 (50,311
) 
 
$
 42,986
 
 
$
 93,297
 
  
$
 (39,513
) 
 
$
 53,784
 
Amortization
  
 
 
 
  
 
 (9,352
) 
 
 
 (9,352
) 
 
 
 
 
  
 
 (10,798
) 
 
 
 (10,798
) 
             
 
 
    
 
 
             
 
 
    
 
 
  
Balance of intangible assets, end of period
  
$
 93,297
 
  
$
 (59,663
) 
 
$
 33,634
 
 
$
 93,297
 
  
$
 (50,311
) 
 
$
 42,986
 
             
 
 
    
 
 
             
 
 
    
 
 
  
The following table reflects the estimated amortization expense for the periods presented, as of December 31, 2020.
 
 
  
  December 31, 2020  
 
Year:
  
(Dollars in thousands)
 
2021
    $ 8,240  
2022
      7,126  
2023
      6,010  
2024
      4,892  
2025
      3,773  
Thereafter
      3,593  
    
 
 
  
Total
    $ 33,634