Securities - Schedule of Amortized Cost and Fair Value of Held-to-Maturity Debt Securities (Detail) $ in Thousands |
Jun. 30, 2015
USD ($)
|
|---|---|
| Schedule of Held-to-maturity Securities [Line Items] | |
| Held-to-Maturity Securities, Amortized Cost | $ 12,609 |
| Held-to-Maturity Securities, Gross Unrealized Gains | 0 |
| Held-to-Maturity Securities, Gross Unrealized Losses | 487 |
| Held-to-Maturity Securities, Estimated Fair Value | 12,122 |
| Municipal Securities [Member] | |
| Schedule of Held-to-maturity Securities [Line Items] | |
| Held-to-Maturity Securities, Amortized Cost | 12,609 |
| Held-to-Maturity Securities, Gross Unrealized Gains | 0 |
| Held-to-Maturity Securities, Gross Unrealized Losses | 487 |
| Held-to-Maturity Securities, Estimated Fair Value | $ 12,122 |