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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Changes in Accretable Yield        
Accretable yield balance, beginning of period $ 7,663 $ 9,376 $ 7,825 $ 10,202
Accretion to interest income (516) (465) (854) (958)
Reclassification from nonaccretable difference and disposals, net 256 95 432 (238)
Accretable yield balance, end of period $ 7,403 $ 9,006 $ 7,403 $ 9,006