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Securities - Additional Information (Detail) $ in Thousands		12 Months Ended
		Dec. 31, 2015 USD ($) Investment	Dec. 31, 2014 USD ($) Investment	Dec. 31, 2013 USD ($)
Schedule of Investments [Line Items]
Federal Home Loan Bank stock, at cost | $	[1]	$ 663,971	$ 515,327
Proceeds from sales of held to maturity securities | $		44,104	139,294	$ 191,142
Gain realized gains from sales of held to maturity securities | $		2,900	7,800
Investment securities designated as having a continuous loss position for twelve months or more, unrealized losses | $		$ 24,900	$ 51,600
Investment securities designated as having a continuous loss position for twelve months or more, percentage below collective amortized cost		2.00%	1.90%
Investment securities designated as having a continuous loss position for twelve months or more, amortized cost | $		$ 1,200,000	$ 2,700,000
Agency Debt Securities
Schedule of Investments [Line Items]
Number of investment securities designated as having a continuous loss position for twelve months or more		7	17
Capital trust notes
Schedule of Investments [Line Items]
Number of investment securities designated as having a continuous loss position for twelve months or more		5	5
Mortgage-Related Securities
Schedule of Investments [Line Items]
Number of investment securities designated as having a continuous loss position for twelve months or more		2	16
GSE CMOs
Schedule of Investments [Line Items]
Number of investment securities designated as having a continuous loss position for twelve months or more			3
Municipal bonds
Schedule of Investments [Line Items]
Number of investment securities designated as having a continuous loss position for twelve months or more			2
Preferred stock securities
Schedule of Investments [Line Items]
Number of investment securities designated as having a continuous loss position for twelve months or more			1
Minimum
Schedule of Investments [Line Items]
Percentage of amount collected to recognize sale of securities		85.00%	85.00%
[1] Carrying value and estimated fair value are at cost.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 325
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6478792&loc=d3e63345-112809

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
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The cash inflow associated with the sale of securities that had been designated as held-to-maturity. Excludes proceeds from maturities, prepayments and calls by the issuer.

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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
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