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GOODWILL AND INTANGIBLE ASSETS | 12 Months Ended
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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):
|  | 2024 |  | 2023
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, 2024 |  | As of December 31, 2023
|  | Balance Acquired |  | Accumulated Amortization |  | Balance Acquired |  | Accumulated Amortization
Core deposit intangibles |  | $ | 5,975 |  |  | $ | 5,975 |  |  | $ | 5,975 |  |  | $ | 5,975 |
Other customer relationship intangibles |  | 5,633 |  |  | 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.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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