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GOODWILL AND INTANGIBLE ASSETS
3 Months Ended
Mar. 31, 2022
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 three month periods ended March 31, 2022 and 2021 were as follows (in thousands):
 20222021
Beginning of year$21,824 $21,824 
Acquired goodwill— — 
Ending balance March 31,$21,824 $21,824 


Acquired intangible assets were as follows at March 31, 2022 and December 31, 2021 (in thousands):
 At March 31, 2022At December 31, 2021
 Balance AcquiredAccumulated AmortizationBalance AcquiredAccumulated Amortization
Core deposit intangibles$5,975 $5,975 $5,975 $5,974 
Other customer relationship intangibles5,633 5,629 5,633 5,619 
Total$11,608 $11,604 $11,608 $11,593 

Aggregate amortization expense was $11 thousand and $0.1 million for the three month periods ended March 31, 2022 and 2021, respectively.

The remaining estimated aggregate amortization expense at March 31, 2022 is listed below (in thousands):
YearEstimated Expense
2022$
Total$
The amount of goodwill reflected in the Corporation's Unaudited Consolidated Financial statements is required to be tested by management for impairment on at least an annual basis. Goodwill impairment testing is performed annually as of December 31 and no impairment charges were incurred.