Deposits - Additional Information (Detail) - USD ($) |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Schedule Of Deposits [Line Items] | ||
| Overdrawn deposit balances classified as consumer loans | $ 796,000 | $ 1,216,000 |
| California [Member] | ||
| Schedule Of Deposits [Line Items] | ||
| Certificate of deposits, included in time certificates $250,000 and over | $ 50,000,000 | $ 5,000,000 |