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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
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 September 30, 2021 and December 31, 2020, and the carrying amount of unamortized intangible assets as of those same dates.
|  | September 30, 2021 |  | December 31, 2020
($ in thousands) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Amortizable intangible assets: |  |  |  |  |  |  |  |
Customer lists |  | $ | 2,700 |  |  | 1,263 |  |  | 7,613 |  |  | 2,814 |
Core deposit intangibles |  | 28,440 |  |  | 25,677 |  |  | 28,440 |  |  | 23,832 |
SBA servicing asset |  | 11,687 |  |  | 5,792 |  |  | 9,976 |  |  | 4,188 |
Other |  | 1,040 |  |  | 962 |  |  | 1,403 |  |  | 1,232 |
Total |  | $ | 43,867 |  |  | 33,694 |  |  | 47,432 |  |  | 32,066 |
Unamortizable intangible assets: |  |  |  |  |  |  |  |
Goodwill |  | $ | 231,906 |  |  |  |  | 239,272 |  |  |
Schedule of the estimated amortization expense for the five succeeding fiscal years | The following table presents the estimated amortization expense schedule related to acquisition-related amortizable intangible assets. 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 amortized intangible assets.
($ in thousands) |  | Estimated Amortization Expense
October 1, 2021 to December 31, 2021 |  | $ | 642 |
2022 |  | 1,994 |
2023 |  | 1,037 |
2024 |  | 392 |
2025 |  | 213 |
Thereafter |  | — |
Total |  | $ | 4,278 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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