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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2023
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | ​ NOTE 8 Goodwill and Other Intangible Assets As of December 31, 2023 and 2022, goodwill totaled $46.8 million and $47.1 million, respectively. The following table summarizes the carrying amounts of goodwill, by segment, as of December 31, 2023 and 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
(dollars in thousands) |  | 2023 |  | 2022
Banking | ​ | $ | 35,260 | ​ | $ | 35,260
Retirement and benefit services | ​ | ​ | 11,523 | ​ | ​ | 11,827
Total goodwill | ​ | $ | 46,783 | ​ | $ | 47,087
​ In the third quarter of 2023, the Company sold an ESOP trustee line of business. The reduction in goodwill in 2023 of $304 thousand was attributed to the sale of this line of business. The gross carrying amount and accumulated amortization for each type of identifiable intangible asset are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023 | ​ | December 31, 2022
(dollars in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Total |  | Gross Carrying Amount |  | Accumulated Amortization |  | Total
Identifiable customer intangibles | ​ | $ | 41,423 | ​ | $ | (29,959) | ​ | $ | 11,464 | ​ | $ | 41,423 | ​ | $ | (25,927) | ​ | $ | 15,496
Core deposit intangible assets | ​ | ​ | 7,592 | ​ | ​ | (1,898) | ​ | ​ | 5,694 | ​ | ​ | 7,592 | ​ | ​ | (633) | ​ | ​ | 6,959
Total intangible assets | ​ | $ | 49,015 | ​ | $ | (31,857) | ​ | $ | 17,158 | ​ | $ | 49,015 | ​ | $ | (26,560) | ​ | $ | 22,455
​ Aggregate amortization expense for the years ended December 31, 2023, 2022, and 2021 was $5.3 million, $4.8 million, and $4.4 million, respectively. Estimated aggregate amortization expense for future years is as follows: ​
​ | ​ | ​ | ​
(dollars in thousands) |  | Amount
2024 | ​ | $ | 5,043
2025 | ​ | ​ | 3,904
2026 | ​ | ​ | 2,275
2027 | ​ | ​ | 2,275
2028 | ​ | ​ | 1,642
Thereafter | ​ | ​ | 2,019
Total | ​ | $ | 17,158
​

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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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