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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill
The following table presents the changes in the carrying amount of goodwill for the periods presented.
 
 
 
As of and for the Year Ended December 31,
 
 
 
2018
 
 
2017
 
 
 
(Dollars in thousands)
 
Balance, beginning of period
 
$
116,564
 
 
$
89,533
 
Additions due to acquisitions
 
 
549,975
 
 
 
27,031
 
Balance, end of period
 
$
666,539
 
 
$
116,564
 
Summary of Amortizable Intangible Assets
The following summarizes activity of amortizable core deposit intangible (“CDI”) assets for the periods presented.
 
 
 
As of and For the Year Ended December 31,
 
 
 
2018
 
 
2017
 
 
 
Gross CDI 

Amount
 
 
Accumulated 

Amortization
 
 
Net CDI 

Amount
 
 
Gross CDI 

Amount
 
 
Accumulated 

Amortization
 
 
Net CDI 

Amount
 
 
 
(Dollars in thousands)
 
Balance of intangible assets, beginning of period
 
$
41,097
 
 
$
(34,259
)
 
$
6,838
 
 
$
37,940
 
 
$
(32,930
)
 
$
5,010
 
Additions due to acquisitions
 
 
52,200
 
 
 
 
 
 
 
 
 
 
 
3,157
 
 
 
 
 
 
 
 
 
Balance of intangible assets, end of period
 
$
93,297
 
 
$
(39,513
)
 
$
53,784
 
 
$
41,097
 
 
$
(34,259
)
 
$
6,838
 
Aggregate amortization expense:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
For year ended December 31,
 
$
5,254
 
 
 
 
 
 
 
 
 
 
$
1,329
 
 
 
 
 
 
 
 
 
Estimated Amortization Expense:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
For the year ending December 31, 2019
 
 
10,798
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
For the year ending December 31, 2020
 
 
9,352
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
For the year ending December 31, 2021
 
 
8,240
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
For the year ending December 31, 2022
 
 
7,126
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Thereafter
 
 
18,268