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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Sep. 30, 2023
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS |
Schedule of gross carrying amount and accumulated amortization for each type of identifiable intangible asset | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023 |  | December 31, 2022
​ | ​ | 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 | ​ | $ | (68,286) | ​ | $ | 9,087 | ​ | $ | 77,373 | ​ | $ | (65,069) | ​ | $ | 12,304
Other intangibles | ​ |  | 125,703 | ​ |  | (78,852) | ​ |  | 46,851 | ​ |  | 119,813 | ​ |  | (71,121) | ​ |  | 48,692
Total amortizing intangibles | ​ | $ | 203,076 | ​ | $ | (147,138) | ​ | $ | 55,938 | ​ | $ | 197,186 | ​ | $ | (136,190) | ​ | $ | 60,996
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)
Oct - Dec 2023 | ​ | $ | 3,563
2024 | ​ | ​ | 12,808
2025 | ​ |  | 10,927
2026 | ​ |  | 9,625
2027 | ​ |  | 4,049
Thereafter | ​ |  | 14,966
Total | ​ | $ | 55,938
Schedule of components of goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(000’s omitted) |  | December 31, 2022 |  | Additions |  | September 30, 2023
Goodwill | ​ | $ | 841,841 | ​ | $ | 3,555 | ​ | $ | 845,396
​

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