Investment Securities - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
Sep. 30, 2015	Jun. 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	$ 2,500,000
Total held-to-maturity investment securities		724,357,000	$ 850,989,000
Investment securities pledged as collateral		2,590,000,000	2,810,000,000
Investment in FHLB stock, impairment losses		$ 0
United States [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities issued by U.S. government percentage		86.00%
CMO/REMIC - Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Total held-to-maturity investment securities		$ 974,000	$ 1,284,000
Total CMO backed by whole loans issued by private-label companies (non-government sponsored)		$ 1,100,000

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

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- Definition

Securities backed by whole loans.

+ References

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- Definition

Securities Issued by Government or Government Sponsored Agencies and Enterprises Percentage.

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No definition available.

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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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- Definition

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

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Amount of unrecognized gain before loss on investments in held-to-maturity securities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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