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Earnings per Common Share - Computation of Basic and Diluted Earnings per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
(Numerator):
Net income	$ 544us-gaap_NetIncomeLoss	$ 1,146us-gaap_NetIncomeLoss
Effective dividend and accretion on preferred stock	329us-gaap_PreferredStockDividendsIncomeStatementImpact	220us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income available to common shareholders	$ 215us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 926us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
(Denominator):
Weighted average shares outstanding - basic	4,906,981us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	4,901,464us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Potentially dilutive common shares - restricted stock units	4,063us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Weighted average shares outstanding - diluted	4,911,044us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	4,901,464us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Income per common share
Basic	$ 0.04us-gaap_EarningsPerShareBasic	$ 0.19us-gaap_EarningsPerShareBasic
Diluted	$ 0.04us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted

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

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

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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