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Loans Receivable, Net - Analysis of Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]    
Balance at beginning of period $ 15,721 $ 15,183
Provision charged to operations 1,371 700
Charge-offs (533) (205)
Recoveries 258 473
Balance at end of period $ 16,817 $ 16,151