Securities (Amortized Cost and Estimated Fair Value of Securities Excluding Trading Securities Presented by Contractual Maturity) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Held to Maturity, Due in one year or less, Amortized Cost	$ 153,701
Held to Maturity, Due after one year through five years, Amortized Cost	533,990
Held to Maturity, Due after five years through ten years, Amortized Cost	172,371
Held to Maturity, Due after ten years, Amortized Cost	2,058,412
Held to Maturity, Residential mortgage-backed securities, Amortized Cost	8,012
Held-to-maturity, Equity Securities, Amortized Cost	0
Held to Maturity, Amortized Cost	2,926,486us-gaap_HeldToMaturitySecurities	3,139,748us-gaap_HeldToMaturitySecurities
Held to Maturity, Due in one year or less, Estimated Fair Value	155,505
Held to Maturity, Due after one year through five years, Estimated Fair Value	564,854
Held to Maturity, Due after five years through ten years, Estimated Fair Value	172,240
Held to Maturity, Due after ten years, Estimated Fair Value	2,065,687
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value	8,104
Held-to-maturity, Equity Securities, Estimated Fair Value	0
Held to Maturity, Estimated Fair Value	2,966,390	3,029,663
Available for Sale, Due in one year or less, Amortized Cost	515,567
Available for Sale, Due after one year through five years, Amortized Cost	2,474,795
Available for Sale, Due after five years through ten years, Amortized Cost	1,937,104
Available for Sale, Due after ten years, Amortized Cost	1,960,996
Available For Sale, Residential mortgage-backed securities, Amortized Cost	1,331,114
Available for Sale, Equity securities, Amortized Cost	42,371
Available for Sale, Amortized Cost	8,261,947	5,799,135
Available for Sale, Due in one year or less, Estimated Fair Value	517,482
Available for Sale, Due after one year through five years, Estimated Fair Value	2,486,488
Available for Sale, Due after five years through ten years, Estimated Fair Value	1,977,280
Available for Sale, Due after ten years, Estimated Fair Value	2,038,909
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value	1,398,724
Available for Sale, Equity securities, Estimated Fair Value	42,371
Available for Sale, Estimated Fair Value	$ 8,461,254us-gaap_AvailableForSaleSecurities	$ 5,895,436us-gaap_AvailableForSaleSecurities

Available For Sale Securities Equity Securities Fair Value

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Mortgage-backed securities Available For Sale, Amortized Cost

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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- Definition

Amount of held-to-maturity debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings.

+ References

+ Details

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- Definition

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Fair value of investments in debt securities classified as held-to-maturity.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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Name:	us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
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- Definition

Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Mortgage-Backed Securities

-URI http://asc.fasb.org/extlink&oid=6517959

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- Definition

Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as held-to-maturity.

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