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Goodwill and Core Deposit Intangibles | 9 Months Ended
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Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Core Deposit Intangibles | Goodwill and Core Deposit Intangibles Management analyzes its goodwill for impairment on an annual basis and between annual tests in certain circumstances, such as upon material adverse changes in legal, business, regulatory, and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value. The Company performed an impairment assessment as of July 1, 2019 and 2018 and concluded that there was no impairment to 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 |
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 |
The Company recorded $3.0 million and $2.0 million of CDI amortization expense for the three months ended September 30, 2019 and 2018, respectively, and $8.3 million and $5.5 million for the nine months ended September 30, 2019 and 2018, respectively. CDI are evaluated for impairment if events and circumstances indicate a possible impairment and are amortized using an accelerated method based on the estimated weighted average useful lives of the related deposits, which is generally ten years. 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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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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