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Goodwill and Core Deposit Intangibles (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table presents changes in the carrying value of goodwill for the periods indicated:
 
2018
 
2017
 
2016
 
(dollars in thousands)
Balance, beginning of year
$
493,329

 
$
102,490

 
$
50,832

Goodwill acquired during the year
313,043

 
390,839

 
51,658

Purchase Accounting Adjustments
2,354

 
—

 
—

Impairment losses
—

 
—

 
—

Balance, end of year
$
808,726

 
$
493,329

 
$
102,490

Accumulated impairment losses at end of year
$
—

 
$
—

 
$
—
Schedule of Finite-Lived Intangible Assets
he Company’s change in the gross amount of core deposit intangibles and the related accumulated amortization consisted of the following at December 31:

 
2018
 
2017
 
2016
 
(dollars in thousands)
Gross amount of CDI:
 
 
 
 
 
Balance, beginning of year
$
54,809

 
$
15,102

 
$
10,782

Additions due to acquisitions
71,136

 
39,707

 
4,320

Balance, end of year
125,945

 
54,809

 
15,102

Accumulated amortization:
 
 
 
 
 
Balance, beginning of year
(11,795
)
 
(5,651
)
 
(3,612
)
Amortization
(13,594
)
 
(6,144
)
 
(2,039
)
Balance, end of year
(25,389
)
 
(11,795
)
 
(5,651
)
Net CDI, end of year
$
100,556

 
$
43,014

 
$
9,451