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Goodwill and Core Deposit Intangibles (Tables) | 9 Months Ended
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Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The following table presents a rollforward of goodwill from the beginning of the year to goodwill as of the dates indicated:
|  | September 30, 2019 |  | December 31, 2018
Net carrying value at beginning of the period |  | $ | 546.7 |  |  | $ | 444.7 |
Additions to provisional goodwill from acquisitions |  | 75.9 |  |  | 102.0 |
Net carrying value at end of period |  | $ | 622.6 |  |  | $ | 546.7 |
Schedule of Core Deposit Intangibles | The following table presents Core deposit intangibles (“CDI”) as of the dates indicated:
|  | September 30, 2019 |  | December 31, 2018
Gross CDI, at beginning of the period |  | $ | 89.7 |  |  | $ | 74.0 |
Established through acquisitions or provisional adjustments |  | 16.6 |  |  | 15.7 |
Reductions due to sale of accounts |  | (0.3 | ) |  | — |
Accumulated amortization |  | (41.0 | ) |  | (32.8 | )
Net CDI, end of period |  | $ | 65.0 |  |  | $ | 56.9 |
Schedule of Future Amortization Expense | The following table provides the estimated future CDI amortization expense:
Years Ending December 31, |  |  |
2019 remaining |  |  | $ | 2.9 |
2020 |  |  | 10.9 |
2021 |  |  | 9.9 |
2022 |  |  | 9.0 |
2023 |  |  | 8.2 |
Thereafter |  |  | 24.1 |
Total |  |  | $ | 65.0 |

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