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Commitments and Contingencies (Detail) (USD $) | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Loan commitments |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | $ 4,378,000 | $ 7,047,000 | $ 3,330,000
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 | 822,000 | 260,000
Other mortgage loans |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 2,817,000 | 6,225,000 | 3,070,000
Unused lines of credit |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 19,490,826 | 19,188,516 | 19,374,032
Home-equity lines |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 11,067,236 | 9,882,497 | 9,232,242
Commercial lines |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 7,726,424 | 8,615,844 | 9,368,770
Secured consumer line |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 24,043 | 3,002 | 19,175
Unsecured consumer lines |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 673,123 | 687,173 | 753,845
Letters of credit |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | $ 32,000 | $ 32,000 | $ 32,000

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