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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
NOTE 8.  GOODWILL AND OTHER INTANGIBLE ASSETS
The carrying amount of our goodwill of $2.5 billion was unchanged for the last three years. We perform our annual goodwill impairment testing in the fourth quarter. We evaluated the carrying value of our goodwill and determined that it was not impaired.
Our other intangible assets with definite lives are CDI and CRI. CDI and CRI are amortized over their respective estimated useful lives and reviewed for impairment at least quarterly. The amortization expense represents the estimated decline in the value of the underlying deposits or customer relationships acquired. The estimated aggregate amortization expense related to our current intangible assets for each of the next five years is $14.7 million for 2020, $10.8 million for 2021, $7.4 million for 2022, $3.8 million for 2023 and $1.7 million for 2024.
The following table presents the changes in CDI and CRI and the related accumulated amortization for the years indicated:
 
Year Ended December 31,
 
2019
 
2018
 
2017
 
(In thousands)
Gross Amount of CDI and CRI:
 
 
 
 
 
Balance, beginning of year
$
119,497

 
$
119,497

 
$
64,187

Addition from the CUB acquisition
—

 
—

 
57,500

Fully amortized portion
(1,924
)
 
—

 
(2,190
)
Balance, end of year
117,573

 
119,497

 
119,497

Accumulated Amortization:
 
 
 
 
 
Balance, beginning of year
(62,377
)
 
(39,871
)
 
(27,821
)
Amortization
(18,726
)
 
(22,506
)
 
(14,240
)
Fully amortized portion
1,924

 
—

 
2,190

Balance, end of year
(79,179
)
 
(62,377
)
 
(39,871
)
Net CDI and CRI, end of year
$
38,394

 
$
57,120

 
$
79,626