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Allowance for Loan Losses - Schedule of Changes in Accretable Yield for PCI Loans (Detail) - PCI Loans
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Balance Beginning $ 1,087
Accretion of acquisition accounting adjustment (261)
Reclassifications from nonaccretable balance, net (56)
Other changes, net 343
Balance Ending $ 1,113