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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 | Dec. 31, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | $ 30,908 | $ 73,093
Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | 26,439 | 59,409
Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | 1,088 | 1,162
Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | 3,381 | 12,522
Doubtful & Loss [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | $ 0 | $ 0

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