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Investment Securities (Gross Realized Gains and Gross Realized Losses on Available-for-Sale Securities) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Gross gains - Available-for-sale Securities	$ 278	$ 2,070	$ 5,018	$ 8,562
Gross losses - Available-for-sale Securities	(247)	(417)	(3,241)	(3,978)
Other-than-temporary impairment - Available-for-sale Securities	0	(215)	(144)	(3,060)
Net gains - Available-for-sale Securities	$ 31	$ 1,438	$ 1,633	$ 1,524

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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