Securities (Amortized Cost And Estimated Fair Value Of Securities, Excluding Trading Securities, Presented By Contractual Maturity) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Held to Maturity, Due in one year or less, Amortized Cost	$ 1,000
Held to Maturity, Due after one year through five years, Amortized Cost	248,088
Held to Maturity, Due after five years through ten years, Amortized Cost	3,301
Held to Maturity, Due after ten years, Amortized Cost	101,534
Held to Maturity, Residential mortgage-backed securities, Amortized Cost	11,074
Held to Maturity, Equity securities, Amortized Cost
Held to Maturity, Amortized Cost	364,997	365,996	366,267
Held to Maturity, Due in one year or less, Estimated Fair Value	1,000
Held to Maturity, Due after one year through five years, Estimated Fair Value	279,980
Held to Maturity, Due after five years through ten years, Estimated Fair Value	3,672
Held to Maturity, Due after ten years, Estimated Fair Value	113,172
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value	11,434
Held to Maturity, Equity securities, Estimated Fair Value
Held to Maturity, Estimated Fair Value	409,258	404,461
Available for Sale, Due in one year or less, Amortized Cost	635,154
Available for Sale, Due after one year through five years, Amortized Cost	2,900,392
Available for Sale, Due after five years through ten years, Amortized Cost	215,664
Available for Sale, Due after ten years, Amortized Cost	1,930,926
Available for Sale, Residential mortgage-backed securities, Amortized Cost	2,587,218
Available for Sale, Equity securities, Amortized Cost	35,887
Available for Sale, Amortized Cost	8,305,241	7,440,389
Available for Sale, Due in one year or less, Estimated Fair Value	638,634
Available for Sale, Due after one year through five years, Estimated Fair Value	2,949,445
Available for Sale, Due after five years through ten years, Estimated Fair Value	234,329
Available for Sale, Due after ten years, Estimated Fair Value	2,107,467
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value	2,751,883
Available for Sale, Equity securities, Estimated Fair Value	35,887
Available for Sale, Estimated Fair Value	$ 8,717,645	$ 7,789,700	$ 5,339,812

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

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