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Goodwill, Core Deposit Intangible and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of Changes in Goodwill and Core Deposit Intangible Assets | The following table summarizes the changes in the Company’s goodwill and core deposit intangible assets for the years ended December 31, 2017, 2016 and 2015:
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Goodwill |  |  | Core Deposit Intangible |  |  | Goodwill |  |  | Core Deposit Intangible |  |  | Goodwill |  |  | Core Deposit Intangible |
Beginning balance |  | $ | 51,975 |  |  | $ | 19,776 |  |  | $ | 25,688 |  |  | $ | 22,275 |  |  | $ | 25,613 |  |  | $ | 25,245 |
Additions |  |  | — |  |  |  | — |  |  |  | 26,287 |  |  |  | 486 |  |  |  | 75 |  |  |  | — |
Amortization or accretion |  |  | — |  |  |  | (3,056 | ) |  |  | — |  |  |  | (2,985 | ) |  |  | — |  |  |  | (2,970 | )
Ending balance |  | $ | 51,975 |  |  | $ | 16,720 |  |  | $ | 51,975 |  |  | $ | 19,776 |  |  | $ | 25,688 |  |  | $ | 22,275 |
Accumulated amortization or accretion |  | N/A |  |  | $ | 13,466 |  |  | N/A |  |  | $ | 10,410 |  |  | N/A |  |  | $ | 7,425 |
Weighted average remaining amortization or accretion period |  | N/A |  |  | 5.6 Years |  |  | N/A |  |  | 6.6 Years |  |  | N/A |  |  | 7.5 Years |
Estimated Amortization Expense for Core Deposit Intangible and Other Intangible Assets Recognized | The following table presents the estimated amortization expense for core deposit intangible and other intangible assets recognized at December 31, 2017:
|  | Estimated Amortization |
2018 |  | $ | 3,061 |
2019 |  |  | 3,050 |
2020 |  |  | 3,026 |
2021 |  |  | 3,017 |
2022 |  |  | 3,010 |
Thereafter |  |  | 1,592 |
Total |  | $ | 16,756 |

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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 the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + 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 + Details
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