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Activity of OTTI on Investment Securities Due to Credit Losses Recognized in Earnings (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Cumulative credit losses on investment securities	$ 422	$ 262
Additions for credit losses not previously recognized	109	160
Cumulative credit losses on investment securities	$ 531	$ 422

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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