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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Income Tax Disclosure [Abstract] |  |  |  |  |
Provision for income taxes |  | $ 164 | $ 55 | $ 584 | $ 98
Charitable contribution, expiry period |  |  |  | 2019 |
Low-income housing, expiry period |  |  |  | 2034 |
Net operating loss carryforwards, expiry period |  |  |  | 2032 |
Cumulative loss position, representing significant negative evidence against the realizability of the deferred tax asset | 3 years |  |  | 3 years |

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- Definition Cumulative loss position, significant negative evidence against the realizability of the deferred tax asset. + References No definition available. + Details
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- Definition Deferred Tax Assets Low Income Housing Credit Carryforward Expiration Period + References No definition available. + Details
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- Definition Provision for income taxes related to net security gains. + References No definition available. + Details
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- Details
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