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Allowance for Loan Losses - Schedule of Changes in Accretable Yield for PCI Loans (Detail) - PCI Loans
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Balance Beginning $ 1,087
Accretion of acquisition accounting adjustment (171)
Reclassifications from nonaccretable balance, net 69
Other changes, net 175
Balance Ending $ 1,160