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Goodwill and Core Deposit Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Change in Carrying Amount of Goodwill |
| Year Ended December 31, |
| 2020 |  | 2019 |  |  |
Net carrying value at beginning of period | $ | 621.6 |  |  | $ | 546.7 |  |  |  |
Acquisitions and measurement period adjustments | — |  |  | 74.9 |  |  |  |
Net carrying value at end of period | $ | 621.6 |  |  | $ | 621.6 |  |  |  |
Schedule of Activity of Identifiable Core Deposit Intangibles |
| Year Ended December 31,
| 2020 |  | 2019 |  |
Gross CDI, beginning of period | $ | 106.0 |  |  | $ | 89.7 |  |  |
Established through acquisitions | — |  |  | 16.6 |  |  |
Reductions due to sale of accounts | — |  |  | (0.3) |  |  |
Accumulated amortization | (54.8) |  |  | (43.9) |  |  |
Net CDI, end of period | $ | 51.2 |  |  | $ | 62.1 |  |  |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The following table provides estimated future CDI amortization expense:
Years ending December 31, |
2021 | $ | 9.9 |
2022 | 9.0 |
2023 | 8.2 |
2024 | 7.3 |
2025 | 6.5 |
Thereafter | 10.3 |
Total | $ | 51.2 |

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