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GOODWILL AND INTANGIBLE ASSETS: | 12 Months Ended
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Dec. 31, 2019
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 2019 and 2018. Management does not believe any amount of goodwill is impaired. Intangible assets subject to amortization at December 31, 2019 and 2018 are as follows:
|  | 2019 |  | 2018
|  | Gross |  | Accumulated |  | Gross |  | Accumulated
(Dollar amounts in thousands) |  | Amount |  | Amortization |  | Amount |  | Amortization
Core deposit intangible |  | $ | 21,205 |  |  | $ | 10,562 |  |  | $ | 10,836 |  |  | $ | 9,639 |
|  | $ | 21,205 |  |  | $ | 10,562 |  |  | $ | 10,836 |  |  | $ | 9,639 |
Aggregate amortization expense was $923 thousand, $433 thousand and $479 thousand for 2019, 2018 and 2017, respectively. Estimated amortization expense for the next five years is as follows:
| In thousands |
2020 | $ | 1,671 |
2021 | 1,615 |
2022 | 1,390 |
2023 | 1,127 |
2024 | 848 |

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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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