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Goodwill and Intangible Assets
6 Months Ended
Jun. 30, 2016
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 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 June 30,
 
Six Months Ended June 30,
 
 
2016
 
2015
 
2016
 
2015
 
 
(in thousands)
Goodwill
 
 
 
 
 
 
 
 
Total goodwill
 
$
382,762

 
$
382,537

 
$
382,762

 
$
382,537

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
 
(37,523
)
 
(30,875
)
 
(35,940
)
 
(29,058
)
Core deposit intangible, net at beginning of period
 
21,075

 
27,723

 
22,658

 
29,540

CDI current period amortization
 
(1,483
)
 
(1,718
)
 
(3,066
)
 
(3,535
)
Total core deposit intangible, net at end of period
 
19,592

 
26,005

 
19,592

 
26,005

Intangible assets not subject to amortization
 
919

 
919

 
919

 
919

Other intangible assets, net at end of period
 
20,511

 
26,924

 
20,511

 
26,924

Total goodwill and other intangible assets at end of period
 
$
403,273

 
$
409,461

 
$
403,273

 
$
409,461


The following table provides the estimated future amortization expense of core deposit intangibles for the remaining six months ending December 31, 2016 and the succeeding four years:
 
 
Amount
 
 
(in thousands)
Year ending December 31,
 
 
2016
 
$
2,880

2017
 
4,913

2018
 
3,855

2019
 
2,951

2020
 
2,048