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GOODWILL AND INTANGIBLE ASSETS
9 Months Ended
Sep. 30, 2023
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, 2023 and 2022 were as follows (in thousands):
 20232022
Beginning of year$21,824 $21,824 
Acquired goodwill— — 
Ending balance September 30,$21,824 $21,824 

The Corporation had no aggregate amortization expense for the three month periods ended September 30, 2023 and 2022. The Corporation had no aggregate amortization expense for the nine month period ended September 30, 2023, and $15 thousand for the nine month period ended September 30, 2022.
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.