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Other Intangibles | 9 Months Ended
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Sep. 30, 2021
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 Hoosier acquisition on April 1, 2021 resulted in a customer relationship intangible of $2,247,000. Details regarding the Hoosier acquisition are discussed in NOTE 2. ACQUISITION of these Notes to Consolidated Condensed Financial Statements. The carrying basis and accumulated amortization of recognized core deposit intangibles and other intangibles are noted below.
| September 30, 2021 |  | December 31, 2020
Gross carrying amount | $ | 102,396 |  |  | $ | 102,396 |
Other intangibles acquired | 2,247 |  |  | — |
Accumulated amortization | (77,705) |  |  | (73,421) |
Total core deposit and other intangibles | $ | 26,938 |  |  | $ | 28,975 |
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 ten years. Intangible asset amortization expense for the three and nine months ended September 30, 2021 was $1.5 million and $4.3 million, respectively, compared to $1.5 million and $4.5 million for the three and nine months ended September 30, 2020, respectively. Estimated future amortization expense is summarized as follows:
| Amortization Expense
2021 | $ | 1,463 |
2022 | 5,402 |
2023 | 5,145 |
2024 | 4,510 |
2025 | 3,754 |
After 2025 | 6,664 |
| $ | 26,938 |

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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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