Loans Receivable - Schedule of Credit Exposures by Internally Assigned Grades (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Residential Real Estate Multi-Family [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	$ 38,291	$ 33,472
Residential Real Estate Multi-Family [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	38,291	33,472
Residential Real Estate Multi-Family [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable
Residential Real Estate Multi-Family [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable
Residential Real Estate Multi-Family [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable
Residential Real Estate Multi-Family [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable
Residential Real Estate, Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	46,323	46,418
Residential Real Estate, Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	42,563	41,138
Residential Real Estate, Construction [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	681	4,477
Residential Real Estate, Construction [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	3,079	803
Residential Real Estate, Construction [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable
Residential Real Estate, Construction [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	79,299	81,077
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	64,903	65,696
Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	1,369	1,334
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	13,027	14,047
Commercial Real Estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable
Commercial Real Estate [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable
Commercial Real Estate, Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	16,816	15,878
Commercial Real Estate, Construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	16,816	15,878
Commercial Real Estate, Construction [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable
Commercial Real Estate, Construction [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable
Commercial Real Estate, Construction [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable
Commercial Real Estate, Construction [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	51,148	54,445
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	51,071	53,883
Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	22	527
Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable	55	35
Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable
Commercial [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable