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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes in the carrying amount of goodwill by reporting unit | The following table presents changes in the carrying amount of goodwill by reporting unit during the nine months ended September 30, 2019:
($ in thousands) |  | Consumer and Business Banking |  | Commercial Banking |  | Total
Beginning balance, January 1, 2019 |  | $ | 353,321 |  |  | $ | 112,226 |  |  | $ | 465,547 |
Acquisition of East West Markets, LLC |  | — |  |  | 150 |  |  | 150 |
Ending balance, September 30, 2019 |  | $ | 353,321 |  |  | $ | 112,376 |  |  | $ | 465,697 |
Schedule of gross carrying amount of core deposit intangible assets and accumulated amortization | The following table presents the gross carrying amount of core deposit intangible assets and accumulated amortization as of September 30, 2020 and December 31, 2019:
($ in thousands) |  | September 30, 2020 |  | December 31, 2019
Gross balance (1) |  | $ | 86,099 |  |  | $ | 86,099 |
Accumulated amortization (1) |  | (78,899) |  |  | (76,088) |
Net carrying balance (1) |  | $ | 7,200 |  |  | $ | 10,011 |
(1)Excludes fully amortized core deposit intangible assets.
Schedule of estimated future amortization expense of core deposit intangibles | The following table presents the estimated future amortization expense of core deposit intangibles as of September 30, 2020:
($ in thousands) |  | Amount
Remainder of 2020 |  | $ | 823 |
2021 |  | 2,749 |
2022 |  | 1,865 |
2023 |  | 1,199 |
2024 |  | 553 |
Thereafter |  | 11 |
Total |  | $ | 7,200 |

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