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Merger - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Sep. 14, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Net assets acquired: |  |  |
Goodwill |  | $ 76,316 | $ 27,095
UCB [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Consideration paid | $ 117,344 |  |
Net assets acquired: |  |  |
Cash and due from financial institutions | 156,472 |  |
Securities available for sale | 43,214 |  |
Equity securities | 212 |  |
Loans held for sale | 492 |  |
Loans, net | 298,319 |  |
Other securities | 3,527 |  |
Premises and equipment | 5,291 |  |
Accrued interest receivable | 950 |  |
Core deposit intangible | 7,518 |  |
Bank owned life insurance | 17,193 |  |
Other assets | 10,896 |  |
Noninterest-bearing deposits | (226,795) |  |
Interest-bearing deposits | (249,149) |  |
Other liabilities | (17) |  |
Net assets acquired excluding goodwill | 68,123 |  |
Goodwill | $ 49,221 |  |

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