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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Equity [Abstract]
Net unrealized gains (losses) on investments available for sale arising during the period, Pre-tax	$ 1,084
Amounts reclassified from accumulated other comprehensive income (loss), Pre-tax	(902)
Net current period other comprehensive income (loss), Pre-tax	182
Net unrealized gains (losses) on investments available for sale arising during the period, Tax	418
Amounts reclassified from accumulated other comprehensive income (loss), Tax	(348)
Net current period other comprehensive income (loss), Tax	70
Net unrealized gains (losses) on investments available for sale arising during the period, After-tax	666
Amounts reclassified from accumulated other comprehensive income (loss), After-tax	(554)
Net current period other comprehensive income (loss), After-tax	$ 112

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