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Goodwill and Intangible Assets
9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Other Intangible Assets
In accordance with the Intangibles – Goodwill and Other topic of the FASB ASC, goodwill is not amortized but is reviewed for potential impairment at the reporting unit level. Management analyzes its goodwill for impairment on an annual basis on July 31 and between annual tests in certain circumstances such as material adverse changes in legal, business, regulatory and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value. The Company performed an annual impairment assessment as of July 31, 2017 and concluded that there was no impairment.
The core deposit intangible (“CDI”) is evaluated for impairment if events and circumstances indicate a possible impairment. The CDI is amortized on an accelerated basis over an estimated life of 10 years.
The following table sets forth activity for goodwill and other intangible assets for the periods indicated:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2017
 
2016
 
2017
 
2016
 
 
(in thousands)
Goodwill
 
 
 
 
 
 
 
 
Total goodwill
 
$
382,762

 
$
382,762

 
$
382,762

 
$
382,762

Other intangible assets, net
 
 
 
 
 
 
 
 
Core deposit intangible:
 
 
 
 
 
 
 
 
Gross core deposit intangible balance at beginning of period
 
58,598

 
58,598

 
58,598

 
58,598

Accumulated amortization at beginning of period
 
(44,484
)
 
(39,006
)
 
(41,886
)
 
(35,940
)
Core deposit intangible, net at beginning of period
 
14,114

 
19,592

 
16,712

 
22,658

CDI current period amortization
 
(1,188
)
 
(1,460
)
 
(3,786
)
 
(4,526
)
Total core deposit intangible, net at end of period
 
12,926

 
18,132

 
12,926

 
18,132

Intangible assets not subject to amortization
 
919

 
919

 
919

 
919

Other intangible assets, net at end of period
 
13,845

 
19,051

 
13,845

 
19,051

Total goodwill and other intangible assets at end of period
 
$
396,607

 
$
401,813

 
$
396,607

 
$
401,813


The following table provides the estimated future amortization expense of core deposit intangibles for the remaining three months ending December 31, 2017 and the succeeding four years:
 
 
Amount
 
 
(in thousands)
Year ending December 31,
 
 
2017
 
$
1,127

2018
 
3,855

2019
 
2,951

2020
 
2,048

2021
 
1,440