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Loans Receivable, Net - Summary of Impaired Loans Excluding PCI Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Receivables [Abstract]    
Impaired loans with no allocated allowance for loan losses $ 29,951 $ 29,797
Impaired loans with allocated allowance for loan losses 4,500 0
Total 34,451 29,797
Amount of the allowance for loan losses allocated $ 604 $ 0