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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2022
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | NOTE 8 Goodwill and Other Intangible Assets As of December 31, 2022 and 2021, goodwill totaled $47.1 million and $31.5 million, respectively. The following table summarizes the carrying amounts of goodwill, by segment, as of December 31, 2022 and 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
(dollars in thousands) |  | 2022 |  | 2021
Banking (1) | ​ | $ | 35,260 | ​ | $ | 20,131
Retirement and benefit services | ​ | ​ | 11,827 | ​ | ​ | 11,359
Total goodwill | ​ | $ | 47,087 | ​ | $ | 31,490
(1) | Goodwill increases consisted of the Metro Phoenix Bank acquisition purchase accounting adjustments, where were finalized in the fourth quarter of 2022.
​ The gross carrying amount and accumulated amortization for each type of identifiable intangible asset are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022 | ​ | December 31, 2021
(dollars in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Total |  | Gross Carrying Amount |  | Accumulated Amortization |  | Total
Identifiable customer intangibles | ​ | $ | 41,423 | ​ | $ | (25,927) | ​ | $ | 15,496 | ​ | $ | 42,057 | ​ | $ | (21,807) | ​ | $ | 20,250
Core deposit intangible assets | ​ | ​ | 7,592 | ​ | ​ | (633) | ​ | ​ | 6,959 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total intangible assets | ​ | $ | 49,015 | ​ | $ | (26,560) | ​ | $ | 22,455 | ​ | $ | 42,057 | ​ | $ | (21,807) | ​ | $ | 20,250
​ Aggregate amortization expense for the years ended December 31, 2022, 2021, and 2020 was $4.8 million, $4.4 million, and $4.0 million, respectively. Estimated aggregate amortization expense for future years is as follows: ​
​ | ​ | ​ | ​
(dollars in thousands) |  | Amount
2023 | ​ | $ | 5,297
2024 | ​ | ​ | 5,043
2025 | ​ | ​ | 3,904
2026 | ​ | ​ | 2,275
2027 | ​ | ​ | 2,275
Thereafter | ​ | ​ | 3,661
Total | ​ | $ | 22,455
​

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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 https://asc.fasb.org/topic&trid=2144416 + Details
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