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Investment Securities (Credit Losses on Non-Agency Residential Mortgage-Backed Securities) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Balance	$ 1,280	$ 4,602
Amount related to credit losses for which an other-than-temporary impairment was not previously recognized	325	0
Additional amount related to credit losses for which an other-than-temporary impairment was previously recognized	63	144
Realized losses	34	0
Balance	$ 1,634	$ 4,746

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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