Fair Value Measures - Summary of Assets Measured at Fair Value on Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Impaired loans
Total impaired loans	$ 2,102	$ 2,374
Repossessed assets
Total repossessed assets	493	504
Automobile [Member]
Repossessed assets
Total repossessed assets	2	13
Land [Member]
Repossessed assets
Total repossessed assets	102	102
One-To-Four-Family [Member]
Impaired loans
Total impaired loans		272
Multi-Family [Member]
Impaired loans
Total impaired loans	2,102	2,102
Commercial Real Estate [Member]
Repossessed assets
Total repossessed assets	389	389
Significant Unobservable Inputs (Level 3) [Member]
Impaired loans
Total impaired loans	2,102	2,374
Repossessed assets
Total repossessed assets	493	504
Significant Unobservable Inputs (Level 3) [Member] | Automobile [Member]
Repossessed assets
Total repossessed assets	2	13
Significant Unobservable Inputs (Level 3) [Member] | Land [Member]
Repossessed assets
Total repossessed assets	102	102
Significant Unobservable Inputs (Level 3) [Member] | One-To-Four-Family [Member]
Impaired loans
Total impaired loans		272
Significant Unobservable Inputs (Level 3) [Member] | Multi-Family [Member]
Impaired loans
Total impaired loans	2,102	2,102
Significant Unobservable Inputs (Level 3) [Member] | Commercial Real Estate [Member]
Repossessed assets
Total repossessed assets	$ 389	$ 389