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GOODWILL AND INTANGIBLE ASSETS
12 Months Ended
Dec. 31, 2020
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, 2020 and 2019 were as follows (in thousands):
 20202019
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, 2020 and 2019 (in thousands):
 At December 31, 2020At December 31, 2019
 Balance AcquiredAccumulated AmortizationBalance AcquiredAccumulated Amortization
Core deposit intangibles$5,975 $5,962 $5,975 $5,832 
Other customer relationship intangibles5,633 5,388 5,633 5,034 
Total$11,608 $11,350 $11,608 $10,866 

Aggregate amortization expense was $0.5 million, $0.6 million, and $0.7 million for 2020, 2019 and 2018, respectively.

The remaining estimated aggregate amortization expense at December 31, 2020 is listed below (in thousands):
YearEstimated Expense
2021$258 
Total$258