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Investment Securities - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Fair value of securities	$ 898,600,000		$ 898,600,000
Net unrealized holding gain after tax	3,900,000
Average life of investment grade debt securities, years			4 years 1 month 6 days
Credit-related impairment loss on investment securities held-to-maturity	0	$ 0	$ 0	$ 0
Investment securities pledged as collateral	2,810,000,000		2,810,000,000		$ 3,110,000,000
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	84.00%		84.00%
Government Agency/GSEs [Member]
Schedule of Available-for-sale Securities [Line Items]
Agency bond callable			$ 221,200,000
CMO's/REMIC's - Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
CMOs backed by whole loans issued by private-label companies (non-government sponsored)	$ 1,500,000		$ 1,500,000
Investment contractual cash flows guaranteed by Government, percentage	99.93%		99.93%
Investment contractual cash flows guaranteed by banks, percentage	0.07%		0.07%
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted-average life of investment grade debt securities, years			8 years 3 months 18 days

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