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Changes in Receivable from FDIC (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Changes in the receivable from the FDIC        
Beginning balance $ 23,653 $ 30,908 $ 27,900 $ 34,691
Decrease in estimated losses on covered loans (75) (110) (29) (451)
Increase in estimated losses on covered OREO 801 674 1,359 1,233
Reimbursable expenses from the FDIC 44 88 409 375
Net amortization (1,768) (1,096) (5,179) (3,166)
Reimbursements from the FDIC (606) (719) (2,411) (2,937)
Ending balance $ 22,049 $ 29,745 $ 22,049 $ 29,745