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Loans Receivable and Allowance for Loan Losses - Schedule of FDIC Loss Sharing Receivable (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
FDIC Indemnification Asset [Roll Forward]        
Beginning balance $ 0 $ (2,544) $ 0 $ (2,083)
Other activity, net 0 49 0 (255)
Cash payments to (receipts from) the FDIC 0 348 0 668
Ending balance 0 (1,381) 0 (1,381)
Provision for loan losses 535 1,552 3,585 3,055
Effect attributable to FDIC loss share arrangements 0 (766) 0 (289)
Provision for loan losses $ 535 $ 786 $ 3,585 $ 2,766