Securities Sold Under Agreements to Repurchase and Other Borrowed Funds - Additional Information (Detail) - USD ($) $ in Thousands |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Servicing Asset at Amortized Cost [Line Items] | ||
| Balance of securities sold under agreements to repurchase | $ 3,772 | $ 3,695 |
| Total principal balance of loans | $ 0 | $ 1,020 |