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Note 4. Fair Value of Financial Instruments (Detail) - The Estimated Fair Values of Financial Instruments (USD $)
Jun. 30, 2012
Dec. 31, 2011
FINANCIAL ASSETS    
Cash and due from banks $ 29,523,962 $ 52,942,095
Cash and due from banks 29,523,962 52,942,095
Federal funds sold 38,198,082 55,121,113
Federal funds sold 38,198,082 55,121,113
Held to maturity securities 335,836,897 360,566,062
Held to maturity securities 339,885,266 363,252,684
Federal reserve stock 322,100 322,100
Federal reserve stock 322,100 322,100
Loans held for investment, net 685,517,248 696,785,798
Loans held for investment, net 693,864,864 701,196,384
Cash surrender value of life insurance 27,821,733 12,491,722
Cash surrender value of life insurance 27,821,733 12,491,722
Mortgage servicing rights 1,621,170 1,598,802
Mortgage servicing rights 1,782,632 1,884,447
Accrued interest receivable 4,373,292 4,650,828
Accrued interest receivable 4,373,292 4,650,828
FINANCIAL LIABILITIES    
Deposits 1,024,207,263 1,070,479,902
Deposits 1,022,834,783 1,069,056,674
Accrued interest payable 215,583 251,243
Accrued interest payable $ 215,583 $ 251,243