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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Tables) | 6 Months Ended
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Jun. 30, 2021
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS |
Schedule of gross carrying amount and accumulated amortization for each type of identifiable intangible asset | The gross carrying amount and accumulated amortization for each type of identifiable intangible asset are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021 |  | December 31, 2020
​ | ​ | 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 | ​ | $ | 69,403 | ​ | $ | (58,136) | ​ | $ | 11,267 | ​ | $ | 69,403 | ​ | $ | (55,572) | ​ | $ | 13,831
Other intangibles | ​ |  | 91,899 | ​ |  | (55,386) | ​ |  | 36,513 | ​ |  | 90,462 | ​ |  | (51,353) | ​ |  | 39,109
Total amortizing intangibles | ​ | $ | 161,302 | ​ | $ | (113,522) | ​ | $ | 47,780 | ​ | $ | 159,865 | ​ | $ | (106,925) | ​ | $ | 52,940
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 2021 |  | $ | 6,229
2022 | ​ |  | 11,141
2023 | ​ |  | 9,338
2024 | ​ |  | 7,768
2025 | ​ |  | 6,550
Thereafter | ​ |  | 6,754
Total | ​ | $ | 47,780
Schedule of components of goodwill | Shown below are the components of the Company’s goodwill at December 31, 2020 and June 30, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(000’s omitted) |  | December 31, 2020 |  | Activity |  | June 30, 2021 |
Goodwill, net | ​ | $ | 793,708 | ​ | $ | 1,184 | ​ | $ | 794,892 | ​

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