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Loans - Summary of Changes in Accretable Yield for PCI Loans (Detail) - PCI Loans
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Balance Beginning $ 1,087
Accretion of acquisition accounting adjustment (358)
Reclassifications from nonaccretable balance, net (46)
Other changes, net 400
Balance Ending $ 1,083