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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Changes in Accretable Yield        
Accretable yield balance, beginning of period $ 7,403 $ 9,006 $ 7,825 $ 10,202
Accretion to interest income (310) (368) (1,164) (1,326)
Reclassification from nonaccretable difference and disposals, net (4) (276) 428 (514)
Accretable yield balance, end of period $ 7,089 $ 8,362 $ 7,089 $ 8,362