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Investment Securities - Contractual Maturities of Investment Securities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Available for Sale Amortized Cost
Due within one year	$ 61,064us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost		$ 125,021us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Due over one to five years	5,938,706us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
Due over five to ten years	2,007,824us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost		400,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
Due over ten years	32,957,092us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	32,729,025us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	38,353,076us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
Mortgage-backed, due in monthly installments	46,859,454us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	43,540,779us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	57,523,144us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
Available-for-sale Securities, Amortized Cost	87,824,140us-gaap_AvailableForSaleSecuritiesAmortizedCost	76,269,804us-gaap_AvailableForSaleSecuritiesAmortizedCost	96,401,241us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available for Sale Fair Value
Due within one year	61,780us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue		125,745us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Due over one to five years	5,923,560us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Due over five to ten years	2,004,890us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue		415,028us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Due over ten years	33,611,161us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	31,233,063us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	40,881,179us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Mortgage-backed, due in monthly installments	46,391,754us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	43,080,619us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	59,068,315us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
Available-for-sale Securities, Fair Value	$ 87,993,145us-gaap_AvailableForSaleSecurities	$ 74,313,682us-gaap_AvailableForSaleSecurities	$ 100,490,267us-gaap_AvailableForSaleSecurities

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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