Real Estate and Other Assets Owned - Presentation of Balances in Other Real Estate and Assets Owned Consisting Other Non-Performing Loan (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total other real estate owned	$ 1,439	$ 1,548	$ 681	$ 2,267
Total non-accrual loans	12,128	7,663	9,824
Total non-performing assets	13,567	9,211	10,505
Non-performing assets / Total assets	1.45%	0.95%	1.05%
One-to-Four Family Mortgages [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total other real estate owned	252	258	147	480
Total non-accrual loans	865	2,243	2,795
Multi-Family [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total other real estate owned				905
Total non-accrual loans		38	190
Construction [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total other real estate owned		130	216	465
Total non-accrual loans
Land [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total other real estate owned	1,112	1,112	275	248
Total non-accrual loans	2,257	2,768	3,279
Non-Residential Real Estate [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total other real estate owned	73	44	43	160
Total non-accrual loans	7,187	1,134	1,268
Consumer Assets [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Total other real estate owned	$ 2	$ 4		$ 9