FHLB Advances - Schedule of Federal Home Loan Advances Pledged By Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Collateralized advances	$ 25,544	$ 28,883
Single-family mortgage loans [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Collateralized advances	9,263	11,141
Multi-family residential [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Collateralized advances	5,036	4,222
Commercial [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Collateralized advances	1,254	3,384
Securities [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Collateralized advances	6,691	9,336
Cash [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Collateralized advances	$ 3,300	$ 800