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Components of Net Deferred Income Tax Benefits (Detail) (USD $) | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Deferred income tax benefits: |  |  |
Accrued deferred compensation | $ 129,101 | $ 120,695 | $ 108,861
Impairment loss on investment securities | 1,218,497 | 1,212,351 | 1,212,351
Allowance for credit losses | 458,303 | 816,722 | 1,275,889
Nonaccrual interest | 339,765 | 283,045 | 69,103
Alternative minimum tax credits | 485,444 | 306,523 | 136,952
Accumulated depreciation | 60,627 | 75,650 | 62,144
Other real estate owned | 14,940 |  |
Reserve for unfunded commitments | 78,890 | 78,890 | 78,890
Other temporary differences | 1,332 |  |
Accumulated securities premium accretion | 39,514 |  |
Net unrealized depreciation on investment securities available for sale | 778,048 |  |
Total deferred income tax benefits | 3,604,461 | 2,893,876 | 2,944,190
Deferred income tax liabilities: |  |  |
Accumulated securities discount accretion |  | 32,209 | 44,165
Net unrealized appreciation on investment securities available for sale |  | 1,626,412 | 1,219,126
Total deferred income tax liabilities |  | 1,658,621 | 1,263,291
Net deferred income tax benefits | $ 3,604,461 | $ 1,235,255 | $ 1,680,899

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