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GOODWILL AND INTANGIBLE ASSETS:
12 Months Ended
Dec. 31, 2017
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 2017 and 2016. Management does not believe any amount of goodwill is impaired.

Intangible assets subject to amortization at December 31, 2017 and 2016 are as follows:  
 
 
2017
 
2016
 
 
Gross
 
Accumulated
 
Gross
 
Accumulated
(Dollar amounts in thousands)
 
Amount
 
Amortization
 
Amount
 
Amortization
Core deposit intangible
 
$
10,836

 
$
9,206

 
$
10,836

 
$
8,727

 
 
$
10,836

 
$
9,206

 
$
10,836

 
$
8,727


 
 Aggregate amortization expense was $479 thousand, $627 thousand and $826 thousand for 2017, 2016 and 2015, respectively.
 
Estimated amortization expense for the next five years is as follows:
 
In thousands

2018
$
434

2019
350

2020
252

2021
232

2022
224



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.