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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | NOTE 8 Goodwill and Other Intangible Assets As of December 31, 2020 and 2019, goodwill totaled $30.2 million and $27.3 million, respectively. The following table summarizes the carrying amounts of goodwill, by segment, as of December 31, 2020 and 2019:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
(dollars in thousands) |  | 2020 |  | 2019
Banking | ​ | $ | 20,131 | ​ | $ | 20,131
Retirement and benefit services | ​ | ​ | 10,070 | ​ | ​ | 7,198
Total goodwill | ​ | $ | 30,201 | ​ | $ | 27,329
​ The gross carrying amount and accumulated amortization for each type of identifiable intangible asset are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019
(dollars in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Total |  | Gross Carrying Amount |  | Accumulated Amortization |  | Total
Identifiable customer intangibles | ​ | $ | 43,346 | ​ | $ | (17,490) | ​ | $ | 25,856 | ​ | $ | 31,857 | ​ | $ | (14,287) | ​ | $ | 17,570
Core deposit intangible assets | ​ | ​ | 3,793 | ​ | ​ | (3,730) | ​ | ​ | 63 | ​ | ​ | 4,993 | ​ | ​ | (4,172) | ​ | ​ | 821
Total intangible assets | ​ | $ | 47,139 | ​ | $ | (21,220) | ​ | $ | 25,919 | ​ | $ | 36,850 | ​ | $ | (18,459) | ​ | $ | 18,391
​ Aggregate amortization expense for the years ended December 31, 2020, 2019, and 2018 was $4.0 million, $4.1 million, and $4.6 million, respectively. Estimated aggregate amortization expense for future years is as follows: ​
​ | ​ | ​ | ​
(dollars in thousands) |  | Amount
2021 | ​ | $ | 4,415
2022 | ​ | ​ | 4,351
2023 | ​ | ​ | 4,351
2024 | ​ | ​ | 4,098
2025 | ​ | ​ | 2,959
Thereafter | ​ | ​ | 5,745
Total | ​ | $ | 25,919
​

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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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