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GOODWILL AND INTANGIBLE ASSETS:
12 Months Ended
Dec. 31, 2016
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 2016 and 2015. Management does not believe any amount of goodwill is impaired.

Intangible assets subject to amortization at December 31, 2016 and 2015 are as follows:  
 
 
2016
 
2015
 
 
Gross
 
Accumulated
 
Gross
 
Accumulated
(Dollar amounts in thousands)
 
Amount
 
Amortization
 
Amount
 
Amortization
Customer list intangible
 
$

 
$

 
$
4,771

 
$
4,309

Core deposit intangible
 
10,836

 
8,727

 
10,836

 
8,120

 
 
$
10,836

 
$
8,727

 
$
15,607

 
$
12,429


 
 Aggregate amortization expense was $627 thousand, $826 thousand and $1.03 million for 2016, 2015 and 2014, respectively.
 
Estimated amortization expense for the next five years is as follows:
 
In thousands

2017
$
479

2018
434

2019
350

2020
252

2021
232



In 2016, the sale of certain assets and liabilities of the insurance brokerage operations resulted in the reduction of customer list intangible by $.4 million and the reduction of goodwill by $5.1 million.