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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, 2016 | Dec. 31, 2015
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | $ 73,093 | $ 93,712
Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | 59,409 | 76,401
Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | 1,162 | 11,142
Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | 12,522 | 6,169
Doubtful & Loss [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total gross PCI loans | $ 0 | $ 0

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- Details
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