Disclosures about Fair Value of Assets and Liabilities - Fair Value Measurements of Assets on a Recurring Basis (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value	$ 48,594,000	$ 48,084,000
Fair Value Measured on Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value	48,594,000	48,084,000
Ginnie Mae and GSE Mortgage-Backed Pass-Through Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value	44,739,000	44,198,000
Ginnie Mae and GSE Mortgage-Backed Pass-Through Securities [Member] | Fair Value Measured on Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value	44,739,000	44,198,000
Ginnie Mae Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value	1,961,000	2,019,000
Ginnie Mae Collateralized Mortgage Obligations [Member] | Fair Value Measured on Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value	1,961,000	2,019,000
Mutual Fund [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value	1,894,000	1,867,000
Mutual Fund [Member] | Fair Value Measured on Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value	1,894,000	1,867,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measured on Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value	1,894,000	1,867,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mutual Fund [Member] | Fair Value Measured on Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value	1,894,000	1,867,000
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measured on Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value	46,700,000	46,217,000
Significant Other Observable Inputs (Level 2) [Member] | Ginnie Mae and GSE Mortgage-Backed Pass-Through Securities [Member] | Fair Value Measured on Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value	44,739,000	44,198,000
Significant Other Observable Inputs (Level 2) [Member] | Ginnie Mae Collateralized Mortgage Obligations [Member] | Fair Value Measured on Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, Fair Value	$ 1,961,000	$ 2,019,000