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Investment Securities - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Fair value of securities		$ 898,600,000
Net unrealized holding gain after tax		$ 3,900,000	$ 1,700,000
Total held-to-maturity investment securities			911,676,000	$ 850,989,000
Gains (losses) recognized			$ 548,000	(22,000)	$ 0
Total held-to-maturity investment securities				1,300,000
Net gain of held-to-maturity investment securities	$ 546,000
Average life of investment grade debt securities, years			4 years 4 months 24 days
Credit-related impairment loss on investment securities held-to-maturity			$ 0	0
Investment securities pledged as collateral			2,190,000,000	2,810,000,000
Investment in FHLB stock, impairment losses			0
Government Agency/GSE [Member]
Schedule of Available-for-sale Securities [Line Items]
Total held-to-maturity investment securities			182,648,000	293,338,000
Agency bond callable			114,100,000
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total held-to-maturity investment securities			$ 290,910,000	324,314,000
Average life of investment grade debt securities, years			9 years 10 months 24 days
United States [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities issued by U.S. government percentage			88.00%
CMO/REMIC - Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Total held-to-maturity investment securities			$ 244,419,000	$ 1,284,000
CMOs backed by whole loans issued by private-label companies (non-government sponsored)			$ 84,000
Investment contractual cash flows guaranteed by Government, percentage			99.997%
Investment contractual cash flows guaranteed by banks, percentage			0.003%

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Investment contractual cash flows guaranteed by banks.

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Investment contractual cash flows guaranteed by government.

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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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