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Debt And Equity Securities (Narrative) (Detail) (USD $)	3 Months Ended		9 Months Ended
Debt And Equity Securities (Narrative) (Detail) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Realized gains on sales of securities	$ 48,300,000	$ 2,500,000	$ 63,900,000	$ 8,400,000
Realized losses on sales of securities	32,000	200,000	300,000	1,300,000
Other-than-temporary impairments			3,564,000	5,216,000
Non-Agency Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments			$ 3,600,000

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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