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Other Comprehensive Income (Loss) - Summary of Components of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Investment securities available-for-sale: Before-Tax
Net change in fair value recorded in accumulated OCI, Before-Tax	$ 24,781	$ (11,696)
Net realized gains reclassified into earnings, Before-Tax		(2,094)
Other comprehensive income (loss), before tax	24,781	(13,790)
Investment securities available-for-sale: Tax Effect
Net change in fair value recorded in accumulated OCI, Tax Effect	10,407	(4,913)
Net realized gains reclassified into earnings, Tax Effect		(879)
Net change, Tax Effect	10,407	(5,792)
Investment securities available-for-sale: After-Tax
Net change in fair value recorded in accumulated OCI, After-Tax	14,374	(6,783)
Net realized gains reclassified into earnings, After-Tax		(1,215)
Other comprehensive income (loss), net of tax	$ 14,374	$ (7,998)

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