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Allowance for Loan Losses - Schedule of Changes in Amortized Yield for PCI Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Balance at beginning of period $ 80  
Acquisition of PCI loans   $ 140
Accretion (31) (60)
Balance at end of period $ 49 $ 80