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Acquired SJB Assets and FDIC Loss Sharing Asset - Summary of PCI Loans by Internal Risk Ratings (Detail) - PCI Loans [Member] - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total PCI gross loans | $ 93,712 | $ 133,496
Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total PCI gross loans | 24,210 | 26,706
Watch List [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total PCI gross loans | 52,191 | 77,371
Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total PCI gross loans | 11,142 | 8,203
Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total PCI gross loans | 6,169 | 21,216
Doubtful & Loss [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total PCI gross loans | $ 0 | $ 0

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