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Goodwill and Other Intangible Assets
12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
NOTE 4.  GOODWILL AND OTHER INTANGIBLE ASSETS
The following table presents the changes in the carrying amount of goodwill for the years indicated:    
 
Goodwill
 
(In thousands)
Balance, December 31, 2016
$
2,173,949

Addition from the CUB acquisition
374,721

Balance, December 31, 2017
2,548,670

Balance, December 31, 2018
$
2,548,670


We perform our annual goodwill impairment testing with an as of date of December 31. 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 loan and lease customers acquired. The estimated aggregate amortization expense related to our current intangible assets for each of the next five years is $18.7 million for 2019, $14.6 million for 2020, $10.8 million for 2021, $7.5 million for 2022 and $3.8 million for 2023.
The following table presents the changes in CDI and CRI and the related accumulated amortization for the years indicated:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In thousands)
Gross Amount of CDI and CRI:
 
 
 
 
 
Balance, beginning of year
$
119,497

 
$
64,187

 
$
95,524

Addition from the CUB acquisition

 
57,500

 

Fully amortized portion

 
(2,190
)
 
(29,637
)
Reduction due to sale of PWEF leasing unit

 

 
(1,700
)
Balance, end of year
119,497

 
119,497

 
64,187

Accumulated Amortization:
 
 
 
 
 
Balance, beginning of year
(39,871
)
 
(27,821
)
 
(42,304
)
Amortization
(22,506
)
 
(14,240
)
 
(16,517
)
Fully amortized portion

 
2,190

 
29,637

Reduction due to sale of PWEF leasing unit

 

 
1,363

Balance, end of year
(62,377
)
 
(39,871
)
 
(27,821
)
Net CDI and CRI, end of year
$
57,120

 
$
79,626

 
$
36,366