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Loans Receivable and Allowance for Loan Losses - Changes in Accretable Yield Related to Purchased-credit-impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Changes in Accretable Yield        
Accretable yield balance, beginning of period $ 9,006 $ 11,165 $ 10,202 $ 12,947
Accretion to interest income (368) (460) (1,326) (1,429)
Reclassification from nonaccretable difference and disposals, net (276) 107 (514) (706)
Accretable yield balance, end of period $ 8,362 $ 10,812 $ 8,362 $ 10,812