Fair Value Measurements and Disclosures - Summary of Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands |
Jun. 30, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Other real estate and repossessed assets | $ 1,636 | $ 1,380 |
| Impaired loans | 5,483 | 4,865 |
| Doubtful [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Impaired loans | 5,483 | 4,865 |
| Level 3 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Other real estate and repossessed assets | 1,636 | 1,380 |
| Level 3 [Member] | Doubtful [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Impaired loans | $ 5,483 | $ 4,865 |