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GOODWILL AND INTANGIBLE ASSETS: | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
GOODWILL AND INTANGIBLE ASSETS | GOODWILL AND INTANGIBLE ASSETS: The Corporation completed its annual impairment testing of goodwill during the fourth quarter of 2021 and 2020. Management does not believe any amount of goodwill is impaired. Goodwill was as follows at year-end:
| 2021 |  | 2020 |  | 2019
Beginning of year | $ | 78,592 |  |  | $ | 78,592 |  |  | $ | 34,355 |
Acquired goodwill | 7,543 |  |  | — |  |  | 44,237 |
Impairment | — |  |  | — |  |  | — |
End of year | $ | 86,135 |  |  | $ | 78,592 |  |  | $ | 78,592 |
Intangible assets subject to amortization at December 31, 2021 and 2020 are as follows:
|  | 2021 |  | 2020
|  | Gross |  | Accumulated |  | Gross |  | Accumulated
(Dollar amounts in thousands) |  | Amount |  | Amortization |  | Amount |  | Amortization
Core deposit intangible |  | $ | 21,205 |  |  | $ | 13,849 |  |  | $ | 21,205 |  |  | $ | 12,233 |
Acquired cored deposit intangible |  | 652 |  |  | (16) |  |  | — |  |  | — |
|  | $ | 21,857 |  |  | $ | 13,833 |  |  | $ | 21,205 |  |  | $ | 12,233 |
Aggregate amortization expense was $1.6 million, $1.7 million and $923 thousand for 2021, 2020 and 2019, respectively. Estimated amortization expense for the next five years is as follows:
| In thousands
2022 | $ | 1,311 |
2023 | 1,128 |
2024 | 888 |
2025 | 786 |
2026 | 679 |

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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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