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Other Intangibles | 12 Months Ended
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Dec. 31, 2020
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. During the one-year measurement period, the Corporation may record subsequent adjustments to these intangibles for provisional amounts recorded at the acquisition date. The MBT acquisition on September 1, 2019 resulted in a core deposit intangible of $16,527,000. Details regarding the MBT acquisition are discussed in NOTE 2. ACQUISITION of these Notes to Consolidated Financial Statements. The carrying basis and accumulated amortization of recognized core deposit and other intangibles are noted below.
| 2020 |  | 2019
Gross carrying amount | $ | 102,396 |  |  | $ | 85,869 |
Core deposit intangible acquired | — |  |  | 16,527 |
Accumulated amortization | (73,421) |  |  | (67,434) |
Total core deposit and other intangibles | $ | 28,975 |  |  | $ | 34,962 |
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, 2020, 2019 and 2018, was $5,987,000, $5,994,000 and $6,719,000, respectively. Estimated future amortization expense is summarized as follows:
| Amortization Expense
2021 | $ | 5,429 |
2022 | 5,027 |
2023 | 4,827 |
2024 | 4,241 |
2025 | 3,526 |
After 2025 | 5,925 |
| $ | 28,975 |

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- Definition The entire disclosure for all or part of the information related to 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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