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Reconciliation of Income Tax Expense Computed at Satutory Rate (Detail) (USD $)	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Income before income tax expense (benefit)	$ 814,000	$ 1,039,000	$ 788,000	$ 607,000	$ 761,000	$ 833,000	$ 805,000	$ 940,000	$ 831,000	$ 1,009,000	$ 998,000	$ 922,000	$ 3,248,032	$ 3,338,887	$ 3,760,503
Taxes computed at Federal income tax rate													1,104,331	1,135,222	1,278,569
Increase (decrease) resulting from:
Tax-exempt income													(630,710)	(644,546)	(600,429)
State income taxes, net of Federal income tax benefit													160,027	151,869	134,510
Other													207	31,262	(45,240)
Income tax expense													$ 633,855	$ 673,807	$ 767,410

X

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other deductions.

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