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Goodwill and Core Deposit Intangibles
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Core Deposit Intangibles Goodwill and Core Deposit Intangibles

At December 31, 2019, the Company had goodwill of $808.3 million. In 2019, adjustments to goodwill in the amount of $404,000 for Grandpoint were recorded during the one-year measurement period subsequent to the acquisition date. In 2018, additions to goodwill included $313.0 million due to the acquisition of Grandpoint and adjustments to goodwill in the amount of $1.8 million for PLZZ and $600,000 for HEOP during the one-year measurement period subsequent to the acquisition date. The following table presents changes in the carrying value of goodwill for the periods indicated:
 
2019
 
2018
 
2017
 
(dollars in thousands)
Balance, beginning of year
$
808,726

 
$
493,329

 
$
102,490

Goodwill acquired during the year
—

 
313,043

 
390,839

Purchase accounting adjustments
(404
)
 
2,354

 
—

Impairment losses
—

 
—

 
—

Balance, end of year
$
808,322

 
$
808,726

 
$
493,329

Accumulated impairment losses at end of year
$
—

 
$
—

 
$
—


The Company assesses goodwill for impairment on an annual basis during the fourth quarter of each year, and more frequently if events or circumstances indicate that there may be impairment. The Company elected to perform a qualitative assessment to determine if it was more likely than not that the fair value of the Company exceeded its carrying value. As a result of this analysis, the Company determined that there was no goodwill impairment as of December 31, 2019.

At December 31, 2019, the Company had core deposit intangibles of $83.3 million. The Company had no additions to core deposit intangibles during 2019. The Company’s change in the gross balance of core deposit intangibles and the related accumulated amortization consisted of the following for the periods indicated:

 
2019
 
2018
 
2017
 
(dollars in thousands)
Gross Balance of CDI:
 
 
 
 
 
Balance, beginning of year
$
125,945

 
$
54,809

 
$
15,102

Additions due to acquisitions
—

 
71,136

 
39,707

Balance, end of year
125,945

 
125,945

 
54,809

Accumulated amortization:
 
 
 
 
 
Balance, beginning of year
(25,389
)
 
(11,795
)
 
(5,651
)
Amortization
(17,244
)
 
(13,594
)
 
(6,144
)
Balance, end of year
(42,633
)
 
(25,389
)
 
(11,795
)
Net CDI, end of year
$
83,312

 
$
100,556

 
$
43,014


The Company amortizes the core deposit intangibles based on the projected useful lives of the related deposits ranging from six to eleven years. The estimated aggregate amortization expense related to our core deposit intangible assets for each of the next five years succeeding December 31, 2019, in order from the present, is $15.4 million, $13.4 million, $11.7 million, $10.2 million and $9.2 million. The Company’s core deposit intangibles is evaluated annually for impairment or sooner if events and circumstances indicate possible impairment. Factors that may attribute to impairment include customer attrition and run-off. Management is unaware of any events and/or circumstances that would indicate a possible impairment to the core deposit intangibles.