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Merger - Schedule of Estimated Future Amortization Expense (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
2018 | $ 303 |
2019 | 1,033 |
2020 | 1,002 |
2021 | 978 |
2022 | 955 |
Thereafter | 5,377 |
Net Carrying Amount | 9,648 | $ 1,279
Core deposit intangibles [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
2018 | 281 |
2019 | 945 |
2020 | 914 |
2021 | 891 |
2022 | 868 |
Thereafter | 4,070 |
Net Carrying Amount | 7,969 | $ 536
UCB [Member] | Core deposit intangibles [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
2018 | 255 |
2019 | 857 |
2020 | 842 |
2021 | 823 |
2022 | 800 |
Thereafter | 3,941 |
Net Carrying Amount | $ 7,518 |

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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