FHLB Advances - Advances From FHLB (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Fixed-rate advances	$ 10,000	$ 15,742
April 2012 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Fixed-rate advances, for current year		5,000
April 2012		2.30%
June 2012 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Fixed-rate advances, for current year		742
April 2012		2.05%
January 2014 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
January 2014	3.12%	3.12%
Fixed-rate advances, after two years	5,000	5,000
May 2014 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
January 2014	3.06%	3.06%
Fixed-rate advances, after two years	$ 5,000	$ 5,000