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Summary of Consolidated Unaudited Quarterly Results of Operations (Detail) (USD $)	3 Months Ended												12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	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, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 3,627us-gaap_InterestAndDividendIncomeOperating	$ 3,658us-gaap_InterestAndDividendIncomeOperating	$ 3,560us-gaap_InterestAndDividendIncomeOperating	$ 3,675us-gaap_InterestAndDividendIncomeOperating	$ 4,004us-gaap_InterestAndDividendIncomeOperating	$ 3,940us-gaap_InterestAndDividendIncomeOperating	$ 3,708us-gaap_InterestAndDividendIncomeOperating	$ 3,630us-gaap_InterestAndDividendIncomeOperating	$ 3,828us-gaap_InterestAndDividendIncomeOperating	$ 4,005us-gaap_InterestAndDividendIncomeOperating	$ 3,928us-gaap_InterestAndDividendIncomeOperating	$ 4,056us-gaap_InterestAndDividendIncomeOperating	$ 14,519,737us-gaap_InterestAndDividendIncomeOperating	$ 15,281,865us-gaap_InterestAndDividendIncomeOperating	$ 15,817,230us-gaap_InterestAndDividendIncomeOperating
Interest expense	652us-gaap_InterestExpense	666us-gaap_InterestExpense	628us-gaap_InterestExpense	588us-gaap_InterestExpense	571us-gaap_InterestExpense	675us-gaap_InterestExpense	699us-gaap_InterestExpense	717us-gaap_InterestExpense	767us-gaap_InterestExpense	810us-gaap_InterestExpense	830us-gaap_InterestExpense	848us-gaap_InterestExpense	2,533,922us-gaap_InterestExpense	2,661,805us-gaap_InterestExpense	3,255,096us-gaap_InterestExpense
Net interest income	2,975us-gaap_InterestIncomeExpenseNet	2,992us-gaap_InterestIncomeExpenseNet	2,932us-gaap_InterestIncomeExpenseNet	3,087us-gaap_InterestIncomeExpenseNet	3,433us-gaap_InterestIncomeExpenseNet	3,265us-gaap_InterestIncomeExpenseNet	3,009us-gaap_InterestIncomeExpenseNet	2,913us-gaap_InterestIncomeExpenseNet	3,061us-gaap_InterestIncomeExpenseNet	3,195us-gaap_InterestIncomeExpenseNet	3,098us-gaap_InterestIncomeExpenseNet	3,208us-gaap_InterestIncomeExpenseNet	11,985,815us-gaap_InterestIncomeExpenseNet	12,620,060us-gaap_InterestIncomeExpenseNet	12,562,134us-gaap_InterestIncomeExpenseNet
Provision for credit losses	746us-gaap_ProvisionForLoanLeaseAndOtherLosses	125us-gaap_ProvisionForLoanLeaseAndOtherLosses	112us-gaap_ProvisionForLoanLeaseAndOtherLosses	38us-gaap_ProvisionForLoanLeaseAndOtherLosses	260us-gaap_ProvisionForLoanLeaseAndOtherLosses				100us-gaap_ProvisionForLoanLeaseAndOtherLosses	150us-gaap_ProvisionForLoanLeaseAndOtherLosses			1,020,876us-gaap_ProvisionForLoanLeaseAndOtherLosses	260,000us-gaap_ProvisionForLoanLeaseAndOtherLosses	250,000us-gaap_ProvisionForLoanLeaseAndOtherLosses
Net securities gains	575us-gaap_GainLossOnSaleOfSecuritiesNet	361us-gaap_GainLossOnSaleOfSecuritiesNet	141us-gaap_GainLossOnSaleOfSecuritiesNet	79us-gaap_GainLossOnSaleOfSecuritiesNet	71us-gaap_GainLossOnSaleOfSecuritiesNet	150us-gaap_GainLossOnSaleOfSecuritiesNet	122us-gaap_GainLossOnSaleOfSecuritiesNet	2us-gaap_GainLossOnSaleOfSecuritiesNet	45us-gaap_GainLossOnSaleOfSecuritiesNet	62us-gaap_GainLossOnSaleOfSecuritiesNet	33us-gaap_GainLossOnSaleOfSecuritiesNet	23us-gaap_GainLossOnSaleOfSecuritiesNet	1,155,978us-gaap_GainLossOnSaleOfSecuritiesNet	345,331us-gaap_GainLossOnSaleOfSecuritiesNet	162,594us-gaap_GainLossOnSaleOfSecuritiesNet
Income before income taxes	521us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	637us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	498us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	567us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	814us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1,039us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	788us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	607us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	761us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	833us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	805us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	940us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2,223,178us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	3,248,032us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	3,338,887us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net income	$ 480us-gaap_NetIncomeLoss	$ 526us-gaap_NetIncomeLoss	$ 435us-gaap_NetIncomeLoss	$ 473us-gaap_NetIncomeLoss	$ 650us-gaap_NetIncomeLoss	$ 795us-gaap_NetIncomeLoss	$ 640us-gaap_NetIncomeLoss	$ 529us-gaap_NetIncomeLoss	$ 609us-gaap_NetIncomeLoss	$ 670us-gaap_NetIncomeLoss	$ 656us-gaap_NetIncomeLoss	$ 730us-gaap_NetIncomeLoss	$ 1,914,526us-gaap_NetIncomeLoss	$ 2,614,177us-gaap_NetIncomeLoss	$ 2,665,080us-gaap_NetIncomeLoss
Net income per share (basic and diluted) (in dollars per share)	$ 0.17us-gaap_EarningsPerShareBasicAndDiluted	$ 0.19us-gaap_EarningsPerShareBasicAndDiluted	$ 0.16us-gaap_EarningsPerShareBasicAndDiluted	$ 0.17us-gaap_EarningsPerShareBasicAndDiluted	$ 0.23us-gaap_EarningsPerShareBasicAndDiluted	$ 0.29us-gaap_EarningsPerShareBasicAndDiluted	$ 0.24us-gaap_EarningsPerShareBasicAndDiluted	$ 0.19us-gaap_EarningsPerShareBasicAndDiluted	$ 0.23us-gaap_EarningsPerShareBasicAndDiluted	$ 0.24us-gaap_EarningsPerShareBasicAndDiluted	$ 0.24us-gaap_EarningsPerShareBasicAndDiluted	$ 0.27us-gaap_EarningsPerShareBasicAndDiluted	$ 0.69us-gaap_EarningsPerShareBasicAndDiluted	$ 0.95us-gaap_EarningsPerShareBasicAndDiluted	$ 0.98us-gaap_EarningsPerShareBasicAndDiluted

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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