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GOODWILL AND INTANGIBLE ASSETS:
12 Months Ended
Dec. 31, 2018
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 2018 and 2017. Management does not believe any amount of goodwill is impaired.

Intangible assets subject to amortization at December 31, 2018 and 2017 are as follows:  
 
 
2018
 
2017
 
 
Gross
 
Accumulated
 
Gross
 
Accumulated
(Dollar amounts in thousands)
 
Amount
 
Amortization
 
Amount
 
Amortization
Core deposit intangible
 
$
10,836

 
$
9,639

 
$
10,836

 
$
9,206

 
 
$
10,836

 
$
9,639

 
$
10,836

 
$
9,206


 
 Aggregate amortization expense was $433 thousand, $479 thousand and $627 thousand for 2018, 2017 and 2016, respectively.
 
Estimated amortization expense for the next five years is as follows:
 
In thousands

2019
$
350

2020
252

2021
232

2022
224

2023
139