Description of Business and Summary of Significant Accounting Policies - Reconciliation of Weighted Average Shares Used for the Basic Computation and that Used for the Diluted Computation (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Basic Earnings per Share
Net Income available to Common Shareholders	$ 3,168	$ 1,418
Number of basic shares	4,855	4,845
Basic Earnings per share	$ 0.65us-gaap_EarningsPerShareBasic	$ 0.29us-gaap_EarningsPerShareBasic
Diluted Earnings per Share
Net Income available to Common Shareholders	3,168	1,418
Preferred Stock Dividends	3	3
Effect of Dilutive Securities	75	77
Number of diluted shares	4,930	4,922
Diluted Earnings per Share	$ 0.64us-gaap_EarningsPerShareDiluted	$ 0.29us-gaap_EarningsPerShareDiluted
Net Income available to Common Shareholders	$ 3,171	$ 1,421

Description of Business and Summary of Significant Accounting Policies - Reconciliation of Weighted Average Shares Used for the Basic Computation and that Used for the Diluted Computation (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Basic Earnings per Share

Net Income available to Common Shareholders

$ 3,168us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic

$ 1,418us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic

Number of basic shares

4,855us-gaap_WeightedAverageNumberOfSharesOutstandingBasic

4,845us-gaap_WeightedAverageNumberOfSharesOutstandingBasic

Basic Earnings per share

$ 0.65us-gaap_EarningsPerShareBasic

$ 0.29us-gaap_EarningsPerShareBasic

Diluted Earnings per Share

Net Income available to Common Shareholders

3,168us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic

1,418us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic

Preferred Stock Dividends

3us-gaap_PreferredStockDividendsIncomeStatementImpact

Effect of Dilutive Securities

75us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities

77us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities

Number of diluted shares

4,930us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

4,922us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

Diluted Earnings per Share

$ 0.64us-gaap_EarningsPerShareDiluted

$ 0.29us-gaap_EarningsPerShareDiluted

Net Income available to Common Shareholders

$ 3,171us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted

$ 1,421us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted

- Definition

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 amount of net income (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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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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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