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Goodwill and Other Intangible Assets | 9 Months Ended
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Sep. 30, 2021
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | NOTE 5 Goodwill and Other Intangible Assets The following table summarizes the carrying amount of goodwill, by segment, as of September 30, 2021 and December 31, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
(dollars in thousands) |  | 2021 |  | 2020
Banking | ​ | $ | 20,131 | ​ | $ | 20,131
Retirement and benefit services | ​ | ​ | 10,070 | ​ | ​ | 10,070
Total goodwill | ​ | $ | 30,201 | ​ | $ | 30,201
​ Goodwill is evaluated for impairment on an annual basis, at a minimum, and more frequently when the economic environment warrants. The Company determined that there was no goodwill impairment as of September 30, 2021. The gross carrying amount and accumulated amortization for each type of identifiable intangible asset are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021 | ​ | December 31, 2020
(dollars in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Total |  | Gross Carrying Amount |  | Accumulated Amortization |  | Total
Identifiable customer intangibles | ​ | $ | 43,346 | ​ | $ | (20,753) | ​ | $ | 22,593 | ​ | $ | 43,346 | ​ | $ | (17,490) | ​ | $ | 25,856
Core deposit intangible assets | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,793 | ​ | ​ | (3,730) | ​ | ​ | 63
Total intangible assets | ​ | $ | 43,346 | ​ | $ | (20,753) | ​ | $ | 22,593 | ​ | $ | 47,139 | ​ | $ | (21,220) | ​ | $ | 25,919
​ Amortization of intangible assets was $1.1 million and $1.0 million for the three months ended September 30, 2021, and 2020, respectively. Amortization of intangible assets was $3.3 million and $3.0 million for the nine months ended September 30, 2021, and 2020, respectively.

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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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