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Loans Receivable, Net - Summary of Changes in Accretable Yield (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance $ 3,183 $ 2,300 $ 3,630 $ 161
Acquisition 0 0 691 2,646
Accretion (599) (368) (1,783) (1,459)
Reclassification from non-accretable difference 69 470 115 1,054
Ending balance $ 2,653 $ 2,402 $ 2,653 $ 2,402