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Goodwill and Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill and Intangible Assets
The following table sets forth activity for goodwill and other intangible assets for the periods indicated:
 
 
Years Ended December 31,
 
 
2018
 
2017
 
2016
 
 
(in thousands)
Goodwill, beginning of period
 
$
765,842

 
$
382,762

 
$
382,762

Established through acquisitions (1)
 

 
383,080

 

Total goodwill, end of period
 
765,842

 
765,842

 
382,762

Other intangible assets, net
 
 
 
 
 
 
Core deposit intangible:
 
 
 
 
 
 
Gross core deposit intangible balance, beginning of period
 
105,473

 
58,598

 
58,598

Accumulated amortization, beginning of period
 
(48,219
)
 
(41,886
)
 
(35,940
)
Core deposit intangible, net, beginning of period
 
57,254

 
16,712

 
22,658

Established through acquisition (1)
 

 
46,875

 

CDI current period amortization
 
(12,236
)
 
(6,333
)
 
(5,946
)
Total core deposit intangible, end of period
 
45,018

 
57,254

 
16,712

Intangible assets not subject to amortization
 
919

 
919

 
919

Other intangible assets, net at end of period
 
45,937

 
58,173

 
17,631

Total goodwill and intangible assets, end of period
 
$
811,779

 
$
824,015

 
$
400,393


__________
(1) See Note 2, “Business Combinations,” for additional information regarding the goodwill related to the acquisition of Pacific Continental on November 1, 2017.
Estimated Future Amortization Expense of Core Deposit Intangibles
The following table provides the estimated future amortization expense of core deposit intangibles for the succeeding five years:
 
 
Years Ending December 31,
 
 
(in thousands)
2019
 
$
10,479

2020
 
8,724

2021
 
7,264

2022
 
5,880

2023
 
4,552