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Goodwill and Core Deposit Intangibles (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill 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
$
—

 
$
—

 
$
—
Schedule of Finite-Lived Intangible Assets 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