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Loans Receivable, Net - Summary of Changes in Accretable Yield (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]    
Beginning balance $ 3,630 $ 161
Acquisition 691 2,646
Accretion (2,613) (2,257)
Reclassification from non-accretable difference 1,317 3,080
Ending balance $ 3,025 $ 3,630