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Activity of OTTI on Investment Securities Due to Credit Losses Recognized in Earnings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Cumulative credit losses on investment securities, through January 1, 2012		$ 422
Additions for credit losses not previously recognized	23	95
Cumulative credit losses on investment securities, through September 30, 2012	$ 517	$ 517

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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