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Repurchase Reserve Liability (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Assets Sold Under Agreements To Repurchase [Roll Forward]        
Balance at beginning of year $ 160 $ 160 $ 160 $ 160
Provision for repurchase liability 0 0 2 40
Reimbursement of expenses 0 0 (2) (40)
Balance at end of year $ 160 $ 160 $ 160 $ 160