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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill | The following is a summary of the gross carrying amount and accumulated amortization of amortizable intangible assets as of December 31, 2020 and December 31, 2019 and the carrying amount of unamortizable intangible assets as of those same dates.
|  | December 31, 2020 |  | December 31, 2019
($ in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Amortizable intangible assets: |  |  |  |  |  |  |  |
Customer lists |  | $ | 7,613 |  |  | 2,814 |  |  | 6,013 |  |  | 2,185 |
Core deposit intangibles |  | 28,440 |  |  | 23,832 |  |  | 28,440 |  |  | 20,610 |
SBA servicing asset |  | 9,976 |  |  | 4,188 |  |  | 7,776 |  |  | 2,393 |
Other |  | 1,403 |  |  | 1,232 |  |  | 1,303 |  |  | 1,127 |
Total |  | $ | 47,432 |  |  | 32,066 |  |  | 43,532 |  |  | 26,315 |
Unamortizable intangible assets: |  |  |  |  |  |  |  |
Goodwill |  | $ | 239,272 |  |  |  |  | 234,368 |  |  |
Schedule of the Estimated Amortization Expense | The following table presents the estimated amortization expense schedule related to acquisition-related amortizable intangible assets for each of the five calendar years ending December 31, 2025 and the estimated amount amortizable thereafter. These amounts will be recorded as "Intangibles amortization expense" within the noninterest expense section of the Consolidated Statements of Income. These estimates are subject to change in future periods to the extent management determines it is necessary to make adjustments to the carrying value or estimated useful lives of amortizable intangible assets.
($ in thousands) |  | Estimated Amortization Expense
2021 |  | $ | 3,272 |
2022 |  | 2,367 |
2023 |  | 1,386 |
2024 |  | 741 |
2025 |  | 562 |
Thereafter |  | 1,250 |
Total |  | $ | 9,578 |

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