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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary Of Significant Accounting Policies [Line Items]      
Loans converted to OREO through foreclosure proceedings total $ 254,536 $ 1,307,203 $ 512,247
FHLB stock can be sold back only at its par value $ 100