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Loans Receivable and Allowance for Loan Losses - Changes in Accretable Discount Related to Purchased Credit Impaired Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]      
Accretable yield balance, beginning of period $ 7,825 $ 10,202 $ 12,947
Accretion to interest income (1,455) (1,673) (3,760)
Reclassification from nonaccretable difference and disposals, net (192) (704) 1,015
Accretable yield balance, end of period $ 6,178 $ 7,825 $ 10,202