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Allowance for Loan Losses - Schedule of Changes in Amortized Yield for PCI Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Movement Schedule Roll Forward        
Balance at beginning of period $ 31 $ 66 $ 49 $ 82
Acquisition of PCI loans 0 0 0 0
Accretion (9) (8) (27) (24)
Balance at end of period $ 22 $ 58 $ 22 $ 58