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Investment Securities - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Sep. 30, 2015	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair value of securities		$ 898,600,000
Net unrealized holding gain after tax	$ 2,500,000	$ 3,900,000
Total held-to-maturity investment securities	$ 812,893,000		$ 850,989,000
Average life of investment grade debt securities, years	3 years 9 months 18 days
Credit-related impairment loss on investment securities held-to-maturity	$ 0		0
Investment securities pledged as collateral	2,760,000,000		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	85.00%
Government Agency/GSEs [Member]
Schedule of Available-for-sale Securities [Line Items]
Total held-to-maturity investment securities	$ 272,934,000		293,338,000
Agency bond callable	201,100,000
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total held-to-maturity investment securities	$ 313,654,000		324,314,000
Average life of investment grade debt securities, years	8 years 6 months
CMO's/REMIC's - Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Total held-to-maturity investment securities	$ 1,226,000		$ 1,284,000
CMOs backed by whole loans issued by private-label companies (non-government sponsored)	$ 1,400,000
Investment contractual cash flows guaranteed by Government, percentage	99.94%
Investment contractual cash flows guaranteed by banks, percentage	0.06%

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