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Components of Net Deferred Income Tax Benefits (Detail) (USD $) | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Deferred income tax benefits: |  |  |
Accrued deferred compensation | $ 120,695 | $ 108,861 | $ 99,454
Impairment loss on investment securities | 1,212,351 | 1,212,351 | 1,176,090
Allowance for credit losses | 816,722 | 1,275,889 | 1,077,153
Nonaccrual interest | 283,045 | 69,103 | 69,103
Alternative minimum tax credits | 306,523 | 136,952 | 199,140
Net unrealized depreciation on investment securities available for sale | 0 | 0 | 663,477
Accumulated depreciation | 75,650 | 62,144 | 39,916
Other real estate owned | 0 | 0 | 2,644
Reserve for unfunded commitments | 78,890 | 78,890 | 78,890
Total deferred income tax benefits | 2,893,876 | 2,944,190 | 3,405,867
Deferred income tax liabilities: |  |  |
Accumulated securities discount accretion | 32,209 | 44,165 | 56,893
Net unrealized appreciation on investment securities available for sale | 1,626,412 | 1,219,126 | 0
Total deferred income tax liabilities | 1,658,621 | 1,263,291 | 56,893
Net deferred income tax benefits | $ 1,235,255 | $ 1,680,899 | $ 3,348,974

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