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Acquired SJB Assets and FDIC Loss Sharing Asset - Summary of Gross PCI Loans by Internal Risk Ratings by Loans (Detail) - PCI Loans [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | $ 17,260 | $ 30,908
Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | 15,775 | 26,439
Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | 1,251 | 1,088
Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | 234 | 3,381
Doubtful & Loss [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | $ 0 | $ 0

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