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Allowance for Loan Losses - Schedule of Loans Components of Purchase Accounting Adjustments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 14, 2018
Dec. 31, 2017
Dec. 31, 2016
Deteriorated Loans Transferred In [Abstract]        
Contractually required payments   $ 2,353    
Non-accretable discount   (1,141)    
Expected cash flows   1,212    
Accretable discount $ (336) (334) $ (15) $ (49)
Estimated fair value   $ 878