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Commitments and Contingencies - Summary of outstanding loan commitments, unused lines of credit and letters of credit (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Loan commitments |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | $ 970,000 | $ 1,666,000 | $ 4,378,000
Construction and land development |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability |  |  | 1,561,000
Other mortgage loans |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | $ 970,000 | $ 1,666,000 | 2,817,000
Unused lines of credit |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 20,415,509 | 19,706,092 | 19,490,826
Home-equity lines |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 2,558,091 | 3,825,462 | 11,067,236
Commercial lines |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 17,195,796 | 15,156,201 | 7,726,424
Secured consumer line |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 27,500 | 50,000 | 24,043
Unsecured consumer lines |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 634,122 | 674,429 | 673,123
Letters of credit |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | $ 47,580 | $ 57,580 | $ 32,000

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