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Income Taxes - Schedule of Reconciliation of Differences in Company's Income Tax (Expense) Benefit (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation Of Provision Of Income Taxes [Line Items]
Tax at federal income tax rate	$ (7,602)	$ (11,077)	$ 2,514
(Increase) decrease resulting from:
Tax-exempt interest	675	585	577
Other	(358)	(64)	104
Provision for income taxes	$ (7,285)	$ (10,556)	$ 3,195

- Definition

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 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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