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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
The following table presents the changes in the carrying amount of goodwill for the period indicated:
 Goodwill
 (In thousands)
Balance, December 31, 2020$1,078,670 
Addition from the Civic acquisition125,422 
Balance, March 31, 2021$1,204,092 
Intangible assets disclosure
The following table presents the changes in CDI and CRI and the related accumulated amortization for the periods indicated:
 Three Months Ended
March 31,
 20212020
 (In thousands)
Gross Amount of CDI and CRI:  
Balance, beginning of period$109,646 $117,573 
Addition from Civic acquisition750 — 
Fully amortized portion(9,846)— 
Balance, end of period100,550 117,573 
Accumulated Amortization:
Balance, beginning of period(86,005)(79,179)
Amortization expense(3,079)(3,948)
Fully amortized portion9,846 — 
Balance, end of period(79,238)(83,127)
Net CDI and CRI, end of period$21,312 $34,446 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
The following table presents the estimated aggregate future amortization expense for our current intangible assets as of the date indicated:
March 31, 2021
(In thousands)
Period ending December 31,
2021$8,142 
20227,672 
20233,787 
20241,711 
Net CDI and CRI$21,312