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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS | 9 Months Ended
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Sep. 30, 2020
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS |
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS | NOTE F: GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS The gross carrying amount and accumulated amortization for each type of identifiable intangible asset are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2020 |  | December 31, 2019
​ | ​ | 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 | ​ | $ | (54,217) | ​ | $ | 15,186 | ​ | $ | 66,475 | ​ | $ | (50,057) | ​ | $ | 16,418
Other intangibles | ​ |  | 90,462 | ​ |  | (49,183) | ​ |  | 41,279 | ​ |  | 89,266 | ​ |  | (42,571) | ​ |  | 46,695
Total amortizing intangibles | ​ | $ | 159,865 | ​ | $ | (103,400) | ​ | $ | 56,465 | ​ | $ | 155,741 | ​ | $ | (92,628) | ​ | $ | 63,113
​ The estimated aggregate amortization expense for each of the five succeeding fiscal years ended December 31 is as follows: ​
​ | ​ | ​ | ​
​ |  | (000's omitted)
Oct - Dec 2020 | ​ | $ | 3,525
2021 | ​ |  | 12,640
2022 | ​ |  | 10,844
2023 | ​ |  | 9,082
2024 | ​ |  | 7,551
Thereafter | ​ |  | 12,823
Total | ​ | $ | 56,465
​ Shown below are the components of the Company’s goodwill at December 31, 2019 and September 30, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(000’s omitted) |  | December 31, 2019 |  | Activity |  | September 30, 2020
Goodwill, net | ​ | $ | 773,810 | ​ | $ | 19,939 | ​ | $ | 793,749
​

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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