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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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Investment securities available-for-sale: Before-Tax
Net change in fair value recorded in accumulated OCI, Before-Tax	$ 421	$ 8,417	$ (65,129)	$ 12,064
Net realized gains reclassified into earnings, Before-Tax			(2,094)
Net change, Before-Tax	421	8,417	(67,223)	12,064
Investment securities available-for-sale: Tax Effect
Net change in fair value recorded in accumulated OCI, Tax Effect	176		(27,355)
Net realized gains reclassified into earnings, Tax Effect			(879)
Net change, Tax Effect	176	3,536	(28,234)	5,068
Investment securities available-for-sale: After-Tax
Net change in fair value recorded in accumulated OCI, After-Tax	245		(37,774)
Net realized gains reclassified into earnings, After-Tax			(1,215)
Other comprehensive income (loss), net of tax	$ 245	$ 4,881	$ (38,989)	$ 6,996

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