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Other Comprehensive Income/(Loss) - Summary of Changes in Accumulated Other Comprehensive Income (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
Investment securities available-for-sale: Before-Tax
Net change in fair value recorded in accumulated OCI, Before-Tax	$ (53,854)	$ 3,720	$ (65,550)	$ 3,647
Net realized gains reclassified into earnings, Before-Tax			(2,094)
Net change, Before-Tax	(53,854)	3,720	(67,644)	3,647
Investment securities available-for-sale: Tax Effect
Net change in fair value recorded in accumulated OCI, Tax Effect	(22,618)		(27,531)
Net realized gains reclassified into earnings,Tax Effect			(879)
Net change, Tax Effect	(22,618)	1,563	(28,410)	1,532
Investment securities available-for-sale: After-Tax
Net change in fair value recorded in accumulated OCI, After-Tax	(31,236)		(38,019)
Net realized gains reclassified into earnings, After-Tax			(1,215)
Other comprehensive (loss) income, before tax	$ (31,236)	$ 2,157	$ (39,234)	$ 2,115

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