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Summary of Significant Accounting Policies - Components of Other Comprehensive Income and Related Tax Effects (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease [Abstract]
Net unrealized gain (loss) on available-for-sale securities	$ (8,448)	$ 417	$ 9,357
Reclassification adjustment for gain on sale of available-for-sale securities	(775)	(852)	(504)
Net unrealized gains (losses)	(9,223)	(435)	8,853
Tax effect	(3,136)	(147)	3,010
Other comprehensive income (loss)	$ (6,087)	$ (288)	$ 5,843

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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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