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Other Intangibles | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Other Intangibles | OTHER INTANGIBLES Core deposit intangibles are recorded on the acquisition date of an entity. The carrying basis and accumulated amortization of recognized core deposit intangibles are noted below.
| March 31, 2021 |  | December 31, 2020
Gross carrying amount | $ | 102,396 |  |  | $ | 102,396 |
Accumulated amortization | (74,778) |  |  | (73,421) |
Total core deposit intangibles | $ | 27,618 |  |  | $ | 28,975 |
The core deposit 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 months ended March 31, 2021 was $1.4 million compared to $1.5 million for the three months ended March 31, 2020. Estimated future amortization expense is summarized as follows:
| Amortization Expense
2021 | $ | 4,072 |
2022 | 5,027 |
2023 | 4,827 |
2024 | 4,241 |
2025 | 3,526 |
After 2025 | 5,925 |
| $ | 27,618 |

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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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