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Earnings Per Common Share (Detail) (USD $)	3 Months Ended												12 Months Ended
Earnings Per Common Share (Detail) (USD $)	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
Basic:
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
Weighted average common shares outstanding (in shares)													2,755,671	2,742,003	2,728,072
Basic net income per share (in dollars per share)													$ 0.69us-gaap_EarningsPerShareBasic	$ 0.95us-gaap_EarningsPerShareBasic	$ 0.98us-gaap_EarningsPerShareBasic

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.