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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Tables) | 6 Months Ended
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Jun. 30, 2023
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS |
Schedule of gross carrying amount and accumulated amortization for each type of identifiable intangible asset | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 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 | ​ | $ | (67,348) | ​ | $ | 10,025 | ​ | $ | 77,373 | ​ | $ | (65,069) | ​ | $ | 12,304
Other intangibles | ​ |  | 123,938 | ​ |  | (76,214) | ​ |  | 47,724 | ​ |  | 119,813 | ​ |  | (71,121) | ​ |  | 48,692
Total amortizing intangibles | ​ | $ | 201,311 | ​ | $ | (143,562) | ​ | $ | 57,749 | ​ | $ | 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)
Jul - Dec 2023 | ​ | $ | 6,988
2024 | ​ | ​ | 12,435
2025 | ​ |  | 10,603
2026 | ​ |  | 9,350
2027 | ​ |  | 3,823
Thereafter | ​ |  | 14,550
Total | ​ | $ | 57,749
Schedule of components of goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(000’s omitted) |  | December 31, 2022 |  | Activity |  | June 30, 2023
Goodwill | ​ | $ | 841,841 | ​ | $ | 2,119 | ​ | $ | 843,960

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