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Changes in Receivable from FDIC (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Changes in the receivable from the FDIC        
Beginning balance $ 16,431 $ 23,653 $ 20,844 $ 27,900
Decrease in estimated losses on covered loans   (75) (1) (29)
Increase in estimated losses on covered OREO 277 801 851 1,359
Reimbursable expenses from the FDIC 60 44 134 409
Net amortization (1,369) (1,768) (3,856) (5,179)
Reimbursements from the FDIC (1,067) (606) (3,640) (2,411)
Ending balance $ 14,332 $ 22,049 $ 14,332 $ 22,049