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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Other Intangible Assets |
Schedule of goodwill by segment | 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
Schedule of identifiable intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
Schedule of amortization expense | ​
​ | ​ | ​ | ​
(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 Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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