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Goodwill and Other Intangible Assets | 3 Months Ended
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Mar. 31, 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 March 31, 2021 and December 31, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | 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
​ The gross carrying amount and accumulated amortization for each type of identifiable intangible asset are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021 | ​ | December 31, 2020
(dollars in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Total |  | Gross Carrying Amount |  | Accumulated Amortization |  | Total
Identifiable customer intangibles | ​ | $ | 43,346 | ​ | $ | (18,578) | ​ | $ | 24,768 | ​ | $ | 43,346 | ​ | $ | (17,490) | ​ | $ | 25,856
Core deposit intangible assets | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,793 | ​ | ​ | (3,730) | ​ | ​ | 63
Total intangible assets | ​ | $ | 43,346 | ​ | $ | (18,578) | ​ | $ | 24,768 | ​ | $ | 47,139 | ​ | $ | (21,220) | ​ | $ | 25,919
​ Amortization of intangible assets was $1.2 million and $1.0 million for the three months ended March 31, 2021, and 2020, respectively. 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 March 31, 2021.

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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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