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Loans Receivable, Net - Summary of Changes in Accretable Yield (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance $ 3,630 $ 161
Acquisition 1,171 3,535
Accretion (653) (222)
Reclassification from non-accretable difference 45 18
Ending balance $ 4,193 $ 3,492