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Other Intangibles | 12 Months Ended
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Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Other Intangibles | OTHER INTANGIBLES Core deposit intangibles and other intangibles are recorded on the acquisition date of an entity. The Corporation has one year after the acquisition date, the measurement period, to record subsequent adjustments to these intangibles for provisional amounts recorded at the acquisition date. The Level One acquisition on April 1, 2022 resulted in a core deposit intangible of $17.2 million and other intangibles, consisting of non-compete intangibles, of $1.4 million. In addition, the Hoosier acquisition on April 1, 2021 resulted in a customer relationship intangible of $2.2 million. Details regarding the Level One and Hoosier acquisitions are discussed in NOTE 2. ACQUISITIONS of these Notes to Consolidated Financial Statements. The carrying basis and accumulated amortization of recognized core deposit and other intangibles are noted below.
| 2022 |  | 2021
Gross carrying amount | $ | 104,643 |  |  | $ | 102,396 |
Other intangibles acquired | 18,642 |  |  | 2,247 |
Accumulated amortization | (87,443) |  |  | (79,168) |
Total core deposit and other intangibles | $ | 35,842 |  |  | $ | 25,475 |
The core deposit intangibles and other intangibles are being amortized primarily on an accelerated basis over their estimated useful lives, generally over a period of two to ten years. Amortization expense for the years ended December 31, 2022, 2021 and 2020, was $8.3 million, $5.7 million and $6.0 million, respectively. Estimated future amortization expense is summarized as follows:
| Amortization Expense
2023 | $ | 8,742 |
2024 | 7,271 |
2025 | 6,028 |
2026 | 4,910 |
2027 | 3,603 |
After 2027 | 5,288 |
| $ | 35,842 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -URI https://asc.fasb.org/subtopic&trid=2144471 + Details
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