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Debt Securities Credit Loss Recognized in Income, and Other Losses Recorded in Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Sep. 30, 2012
Credit losses on debt securities held:
Balance, January 1	$ 10,955	$ 11,355
Additions related to other-than-temporary losses not previously recognized	400
Balance, September 30	$ 11,355	$ 11,355

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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