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Goodwill and Core Deposit Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Change in Carrying Amount of Goodwill |
Goodwill
| Year Ended December 31, |
| 2019 |  | 2018 |
Net carrying value at beginning of period | $ | 546.7 |  |  | $ | 444.7 |  |
Acquisitions and measurement period adjustments | 74.9 |  |  | 102.0 |  |
Net carrying value at end of period | $ | 621.6 |  |  | $ | 546.7 |  |
Schedule of Activity of Identifiable Core Deposit Intangibles |
Core deposit intangibles (“CDI”) The following table sets forth activity for identifiable core deposit intangibles subject to amortization:
| Year Ended December 31, |
| 2019 |  | 2018 |
Gross CDI, beginning of period | $ | 89.7 |  |  | $ | 74.0 |  |
Established through acquisitions | 16.6 |  |  | 15.7 |  |
Reductions due to sale of accounts | (0.3 | ) |  | — |  |
Accumulated amortization | (43.9 | ) |  | (32.8 | ) |
Net CDI, end of period | $ | 62.1 |  |  | $ | 56.9 |  |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The following table provides estimated future CDI amortization expense:
Years ending December 31, |  |
2020 | $ | 10.9 |  |
2021 | 9.9 |  |
2022 | 9.0 |  |
2023 | 8.2 |  |
2024 | 7.3 |  |
Thereafter | 16.8 |  |
Total | $ | 62.1 |  |

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