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Other Comprehensive Income (Loss) - Summary of Components of Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Investment securities available-for-sale: Before-Tax
Net change in fair value recorded in accumulated OCI, Before-Tax	$ (10,291)	$ 421	$ 47,272	$ (65,129)
Net realized gains reclassified into earnings, Before-Tax				(2,094)
Net change, Before-Tax	(10,291)	421	47,272	(67,223)
Investment securities available-for-sale: Tax Effect
Net change in fair value recorded in accumulated OCI, Tax Effect	(4,322)	176	19,854	(27,355)
Net realized gains reclassified into earnings, Tax Effect				(879)
Net change, Tax Effect	(4,322)	176	19,854	(28,234)
Investment securities available-for-sale: After-Tax
Net change in fair value recorded in accumulated OCI, After-Tax	(5,969)	245	27,418	(37,774)
Net realized gains reclassified into earnings, After-Tax				(1,215)
Net change, After-Tax	$ (5,969)	$ 245	$ 27,418	$ (38,989)

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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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