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Note 4. Fair Value of Financial Instruments (Detail) - Assets That are Measured at the Lower of Cost or Market and had a Fair Value Below Cost at the End of the Period (USD $)
Jun. 30, 2012
Dec. 31, 2011
Loans held for investment $ 693,864,864 $ 701,196,384
Other real estate owned 7,549,712 7,350,678
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Loans held for investment 16,860,043 17,902,323
Other real estate owned 7,549,712 7,350,678
Totals 24,409,755 25,253,001
Fair Value, Inputs, Level 3 [Member]
   
Loans held for investment 16,860,043 17,902,323
Other real estate owned 7,549,712 7,350,678
Totals $ 24,409,755 $ 25,253,001