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Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
Annual effective income tax rate, percentage	27.00%	26.00%	(3.00%)
Net deferred tax asset	$ 63,178,000	$ 64,132,000
Alternative minimum tax credit carryforward	13,896,000	13,026,000
Deferred tax asset for other-than-temporary impairment of securities	9,693,000	15,233,000
Capital losses	$ 400,000

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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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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