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GOODWILL AND INTANGIBLE ASSETS:
12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND INTANGIBLE ASSETS
GOODWILL AND INTANGIBLE ASSETS:
 
The Corporation completed its annual impairment testing of goodwill during the fourth quarter of 2015 and 2014. Management does not believe any amount of goodwill is impaired.

Intangible assets subject to amortization at December 31, 2015 and 2014 are as follows:  
 
 
2015
 
2014
 
 
Gross
 
Accumulated
 
Gross
 
Accumulated
(Dollar amounts in thousands)
 
Amount
 
Amortization
 
Amount
 
Amortization
Customer list intangible
 
$
4,771

 
$
4,309

 
$
4,669

 
$
4,227

Core deposit intangible
 
10,836

 
8,120

 
10,836

 
7,377

 
 
$
15,607

 
$
12,429

 
$
15,505

 
$
11,604


 
 Aggregate amortization expense was $826 thousand, $1.03 million and $1.20 million for 2015, 2014 and 2013, respectively.
 
Estimated amortization expense for the next five years is as follows:
 
In thousands

2016
$
689

2017
560

2018
515

2019
431

2020
328