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Investment Securities - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair value of securities		$ 898,600,000
Net unrealized holding gain after tax		$ 3,900,000	$ 2,600,000
Total held-to-maturity investment securities	$ 878,953,000		878,953,000	$ 850,989,000
Total held-to-maturity investment securities				1,300,000
Net gain of held-to-maturity investment securities	546,000
Investment securities pledged as collateral	2,250,000,000		2,250,000,000	2,810,000,000
Investment in FHLB stock, impairment losses	$ 0		$ 0
United States [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities issued by U.S. government percentage	87.00%		87.00%
CMO/REMIC - Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Total held-to-maturity investment securities	$ 192,680,000		$ 192,680,000	$ 1,284,000
Total CMO backed by whole loans issued by private-label companies (non-government sponsored)	$ 101,000		$ 101,000

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Fair value of available for sale securities transfer to held to maturity.

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Securities backed by whole loans.

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Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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The fair value of available-for-sale securities that serve as collateral for borrowings.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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