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GOODWILL AND INTANGIBLE ASSETS
 9 Months Ended
Sep. 30, 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 nine month periods ended September 30, 2022 and 2021 were as follows (in thousands):
 20222021
Beginning of year$21,824 $21,824 
Acquired goodwill— — 
Ending balance September 30,$21,824 $21,824 


Acquired intangible assets were as follows at September 30, 2022 and December 31, 2021 (in thousands):
 At September 30, 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 5,633 5,633 5,619 
Total$11,608 $11,608 $11,608 $11,593 

The Corporation had no aggregate amortization expense for the three month period ended September 30, 2022, and $42.0 thousand for the three month period ended September 30, 2021. Aggregate amortization expense was $15.0 thousand and $0.2 million for the nine month periods ended September 30, 2022 and 2021, respectively. As of September 30, 2022, there is no remaining estimated aggregate amortization expense.
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.