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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
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