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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