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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 changes in goodwill included in the core banking segment during the years ended December 31, 2016 and 2015 were as follows (in thousands):
 
 
2016
 
2015
Beginning of year
 
$
21,824

 
$
21,824

Acquired goodwill
 

 

End of year
 
$
21,824

 
$
21,824



Acquired intangible assets were as follows at December 31, 2016 and 2015 (in thousands):
 
At December 31, 2016
 
At December 31, 2015
 
Balance Acquired
 
Accumulated Amortization
 
Balance Acquired
 
Accumulated Amortization
Core deposit intangibles
$
5,975

 
$
4,689

 
$
5,975

 
$
4,057

Other customer relationship intangibles
5,633

 
3,974

 
5,633

 
3,620

Total
$
11,608

 
$
8,663

 
$
11,608

 
$
7,677



Aggregate amortization expense was $1.0 million, $1.1 million, and $1.3 million for 2016, 2015 and 2014, respectively.

The remaining estimated aggregate amortization expense at December 31, 2016 is listed below (in thousands):

Year
 
Estimated Expense
2017
 
$
859

2018
 
734

2019
 
609

2020
 
484

2021
 
259

Total
 
$
2,945