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Advances from Federal Home Loan Bank (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Advances from Federal Home Loan Bank $ 5,100 $ 12,350
Fixed Rate Advance
   
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Weighted Average Rate 3.63% 3.78%
Advances from Federal Home Loan Bank $ 5,100 $ 12,350