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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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule Of Available For Sale Securities [Line Items]
Gross gains - Available-for-sale Securities	$ 26	$ 4,348	$ 433	$ 4,740
Gross losses - Available-for-sale Securities	0	(2,987)	(1)	(2,994)
Other-than-temporary impairment - Available-for-sale Securities	(97)	0	(485)	(144)
Net gains - Available-for-sale Securities	$ (71)	$ 1,361	$ (53)	$ 1,602

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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