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GOODWILL AND INTANGIBLE ASSETS
12 Months Ended
Dec. 31, 2021
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, 2021 and 2020 were as follows (in thousands):
 20212020
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, 2021 and 2020 (in thousands):
 At December 31, 2021At December 31, 2020
 Balance AcquiredAccumulated AmortizationBalance AcquiredAccumulated Amortization
Core deposit intangibles$5,975 $5,974 $5,975 $5,962 
Other customer relationship intangibles5,633 5,619 5,633 5,388 
Total$11,608 $11,593 $11,608 $11,350 

Aggregate amortization expense was $0.2 million and $0.5 million for 2021 and 2020, respectively.

The remaining estimated aggregate amortization expense at December 31, 2021 is listed below (in thousands):
YearEstimated Expense
2022$15 
Total$15