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GOODWILL AND INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2024
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, 2024 and 2023 were as follows (in thousands):
 20242023
Beginning of year$21,824 $21,824 
Acquired goodwill— — 
End of year$21,824 $21,824 

The Corporation's goodwill in the core banking segment arose from multiple acquisitions over the past three decades: Owego National Bank (1995); three branches of M&T Bank (2008); Canton Bancorp, Inc. (2009) and Fort Orange Financial Corporation (2011).

Acquired intangible assets were as follows as of December 31, 2024 and 2023 (in thousands):
 As of December 31, 2024As of December 31, 2023
 Balance AcquiredAccumulated AmortizationBalance AcquiredAccumulated Amortization
Core deposit intangibles$5,975 $5,975 $5,975 $5,975 
Other customer relationship intangibles5,633 5,633 5,633 5,633 
Total$11,608 $11,608 $11,608 $11,608 
There is no aggregate amortization expense for 2024 and 2023. There is no remaining estimated aggregate amortization expense as of December 31, 2024.