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Income Taxes - Components of net deferred income tax benefits (Details 2) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred income tax benefits:      
Accrued deferred compensation $ 145,654 $ 153,256 $ 142,308
Impairment loss on investment securities     1,305,584
Allowance for credit losses 94,628 362,732 364,697
Nonaccrual interest 445,173 445,173 445,173
Alternative minimum tax credits 966,855 929,264 615,186
Net operating loss carryforward credits 665,119 373,986  
Accumulated depreciation 53,706 61,019 72,354
Other real estate owned 18,293 14,940 14,940
Reserve for unfunded commitments 9,780 4,641 78,890
Other temporary differences 22,540 2,116 2,116
Accumulated securities premium accretion 210,615 138,207 71,834
Net unrealized depreciation on investment securities available for sale 527,554 199,277  
Total deferred income tax benefits 3,159,917 2,684,611 3,113,082
Deferred income tax liabilities:      
Accumulated securities discount accretion
Net unrealized appreciation on investment securities available for sale     67,847
Total deferred income tax liabilities     67,847
Net deferred income tax benefits $ 3,159,917 $ 2,684,611 $ 3,045,235