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Goodwill and Core Deposit Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Change in Carrying Amount of Goodwill |
Goodwill
| Year Ended December 31, |
| 2017 |  | 2016 |  | 2015 |
Net carrying value at beginning of period | $ | 212.8 |  |  | $ | 204.5 |  |  | $ | 205.6 |  |
Acquisitions and measurement period adjustments | 231.9 |  |  | 8.3 |  |  | (1.1 | ) |
Net carrying value at end of period | $ | 444.7 |  |  | $ | 212.8 |  |  | $ | 204.5 |  |
Schedule of Activity of Identifiable Core Deposit Intangibles | The following table sets forth activity for identifiable core deposit intangibles subject to amortization:
Core deposit intangibles ("CDI")
| Year Ended December 31, |
| 2017 |  | 2016 |  | 2015 |
CDI, net, beginning of period | $ | 9.7 |  |  | $ | 10.6 |  |  | $ | 13.3 |  |
Established through acquisitions | 48.0 |  |  | 2.5 |  |  | 0.7 |  |
Reductions due to sale of accounts | (3.2 | ) |  | — |  |  | — |  |
Current period amortization | 5.4 |  |  | 3.4 |  |  | 3.4 |  |
Total CDI, net, at end of period | $ | 49.1 |  |  | $ | 9.7 |  |  | $ | 10.6 |  |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The following table provides estimated future CDI amortization expense:
Years ending December 31, |  |
2018 | $ | 6.9 |  |
2019 | 6.6 |  |
2020 | 6.2 |  |
2021 | 5.7 |  |
2022 | 5.3 |  |
Thereafter | 18.4 |  |
Total | $ | 49.1 |  |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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