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Income Taxes - Components of net deferred income tax benefits (Details 2) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Deferred income tax benefits: |  |  |
Accrued deferred compensation | $ 153,256 | $ 142,308 | $ 129,101
Impairment loss on investment securities |  | 1,305,584 | 1,218,497
Allowance for credit losses | 362,732 | 364,697 | 458,303
Nonaccrual interest | 445,173 | 445,173 | 339,765
Alternative minimum tax credits | 929,264 | 615,186 | 485,444
Net operating loss carryforward credits | 373,986 |  |
Accumulated depreciation | 61,019 | 72,354 | 60,627
Other real estate owned | 14,940 | 14,940 | 14,940
Reserve for unfunded commitments | 4,641 | 78,890 | 78,890
Other temporary differences | 2,116 | 2,116 | 1,332
Accumulated securities premium accretion | 138,207 | 71,834 | 39,514
Net unrealized depreciation on investment securities available for sale | 199,277 |  | 778,048
Total deferred income tax benefits | $ 2,684,611 | $ 3,113,082 | $ 3,604,461
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 | $ 2,684,611 | $ 3,045,235 | $ 3,604,461

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