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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Tables) | 3 Months Ended
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Mar. 31, 2025
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS |
Schedule of gross carrying amount and accumulated amortization for each type of identifiable intangible asset | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2025 |  | December 31, 2024
​ | ​ | Gross | ​ | ​ | ​ | ​ | Net | ​ | Gross | ​ | ​ | ​ | ​ | Net
​ |  | Carrying |  | Accumulated |  | Carrying |  | Carrying |  | Accumulated |  | Carrying
(000’s omitted) | ​ | Amount |  | Amortization |  | Amount |  | Amount |  | Amortization |  | Amount
Amortizing intangible assets: | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Core deposit intangibles | ​ | $ | 77,373 | ​ | $ | (72,874) | ​ | $ | 4,499 | ​ | $ | 77,373 | ​ | $ | (72,225) | ​ | $ | 5,148
Other intangibles | ​ |  | 136,879 | ​ |  | (95,568) | ​ |  | 41,311 | ​ |  | 135,833 | ​ |  | (92,735) | ​ |  | 43,098
Total amortizing intangibles | ​ | $ | 214,252 | ​ | $ | (168,442) | ​ | $ | 45,810 | ​ | $ | 213,206 | ​ | $ | (164,960) | ​ | $ | 48,246
Schedule of estimated aggregate amortization expense for each of five succeeding fiscal years | The estimated aggregate amortization expense for each of the five succeeding fiscal years ended December 31 is as follows: ​
​ | ​ | ​ | ​
(000’s omitted)
Apr - Dec 2025 | ​ | $ | 9,465
2026 | ​ | ​ | 11,396
2027 | ​ |  | 5,547
2028 | ​ |  | 4,208
2029 | ​ |  | 3,484
Thereafter | ​ |  | 11,710
Total | ​ | $ | 45,810
Schedule of components of goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Additions/ | ​ | ​
(000’s omitted) |  | December 31, 2024 |  | Adjustments |  | March 31, 2025
Goodwill | ​ | $ | 853,225 | ​ | $ | 1,297 | ​ | $ | 854,522
​

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details
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