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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended		3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Provision for income taxes			$ 209	$ 43
Charitable contribution, expiry period			2019
Low-income housing, expiry period			2034
Net operating loss carryforwards, expiry period			2032
Cumulative loss position, significant negative evidence against the realizability of the deferred tax asset	2 years	2 years

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- Definition

Cumulative loss position, significant negative evidence against the realizability of the deferred tax asset.

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- Definition

Deferred Tax Assets Charitable Contribution Carryforwards Expiration Period

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- Definition

Deferred Tax Assets Low Income Housing Credit Carryforward Expiration Period

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No definition available.

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- Definition

Deferred Tax Assets Operating Loss Carryforwards Expiration Period

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- Definition

Provision for income taxes related to net security gains.

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No definition available.

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