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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
Sep. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total PCI gross loans $ 99,185 $ 133,496
Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total PCI gross loans 22,108 26,706
Watch List [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total PCI gross loans 57,308 77,371
Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total PCI gross loans 13,379 8,203
Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total PCI gross loans 6,390 21,216
Doubtful & Loss [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total PCI gross loans $ 0 $ 0