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GOODWILL AND INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2023
GOODWILL AND INTANGIBLE ASSETS |
GOODWILL AND INTANGIBLE ASSETS | 9.GOODWILL AND INTANGIBLE ASSETS: The Corporation completed its annual impairment testing of goodwill during the fourth quarter of 2023 and 2022. Management does not believe any amount of goodwill is impaired. Goodwill was as follows at year-end: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021
Beginning of year | ​ | $ | 86,985 | ​ | $ | 86,135 | ​ | $ | 78,592
Acquired goodwill | ​ |  | — | ​ |  | 850 | ​ |  | 7,543
Impairment | ​ |  | — | ​ |  | — | ​ |  | —
End of year | ​ | $ | 86,985 | ​ | $ | 86,985 | ​ | $ | 86,135
​ Goodwill related to the acquisition of Hancock Bancorp, Inc. was increased by $850 thousand in 2022 due to adjustments to deferred tax assets related to the filing of the final Hancock Bancorp, Inc. tax return. ​ Intangible assets subject to amortization at December 31, 2023 and 2022 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
​ | ​ | Gross | ​ | Accumulated | ​ | Gross | ​ | Accumulated
(Dollar amounts in thousands) | ​ | Amount | ​ | Amortization | ​ | Amount | ​ | Amortization
Core deposit intangible | ​ | $ | 21,857 | ​ | $ | 16,271 | ​ | $ | 21,857 | ​ | $ | 15,143
​ | ​ | $ | 21,857 | ​ | $ | 16,271 | ​ | $ | 21,857 | ​ | $ | 15,143
​ Aggregate amortization expense was $1.1 million, $1.3 million and $1.6 million for 2023, 2022 and 2021, respectively. Estimated amortization expense for the next five years is as follows: ​
​ | ​ | ​ | ​
​ |  | In thousands
2024 | ​ | $ | 888
2025 | ​ |  | 786
2026 | ​ |  | 679
2027 | ​ |  | 590
2028 | ​ |  | 1,139
​

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