Income Taxes - Effective Tax Rates Differ from Federal Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components Of Income Tax Expense Benefit [Line Items]
Federal statutory rate times financial statement income loss	$ (1,280)	$ (1,845)	$ (2,269)
Bank owned life insurance income	(45)	(44)	(43)
Increase in deferred tax valuation allowance	1,314	1,876	2,276
Other	11	13	234
Income tax expense			$ 198
Effective tax rate	0.00%	0.00%	(3.00%)

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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- Definition

The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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