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Acquired SJB Assets and FDIC Loss Sharing Asset - Summary of Gross PCI Loans by Internal Risk Ratings by Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total gross PCI loans | $ 74,929 |  | $ 94,431
PCI Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total gross PCI loans | 74,929 | $ 93,712 | $ 94,431
PCI Loans [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total gross PCI loans | 59,642 | 76,401 |
PCI Loans [Member] | Special Mention [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total gross PCI loans | 2,478 | 11,142 |
PCI Loans [Member] | Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total gross PCI loans | 12,809 | 6,169 |
PCI Loans [Member] | Doubtful & Loss [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total gross PCI loans | $ 0 | $ 0 |

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