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Fair Value and Interest Rate Risk - Financial Assets Measured at Fair Value on Non-Recurring Basis (Detail) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired Loans (1) $ 36,016,767 $ 33,383,078
Other real estate owned (2) 3,845,041 4,873,844
Fair Value Measurements Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired Loans (1) 14,030,002 8,424,786
Other real estate owned (2) 3,845,041 4,873,844
Level 1 [Member] | Fair Value Measurements Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired Loans (1)      
Other real estate owned (2)      
Level 2 [Member] | Fair Value Measurements Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired Loans (1)      
Other real estate owned (2)      
Level 3 [Member] | Fair Value Measurements Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired Loans (1) 14,030,002 8,424,786
Other real estate owned (2) $ 3,845,041 $ 4,873,844