Securities (Amortized Cost And Estimated Fair Value Of Securities, Excluding Trading Securities, Presented By Contractual Maturity) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 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	247,989
Held to Maturity, Due after five years through ten years, Amortized Cost	3,311
Held to Maturity, Due after ten years, Amortized Cost	101,689
Held to Maturity, Residential mortgage-backed securities, Amortized Cost	11,367
Held to Maturity, Amortized Cost	365,356	365,996	349,997
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	279,921
Held to Maturity, Due after five years through ten years, Estimated Fair Value	3,653
Held to Maturity, Due after ten years, Estimated Fair Value	110,791
Held to Maturity, Residential mortgage-backed securities, Estimated Fair Value	11,657
Held to Maturity, Estimated Fair Value	407,022	404,461
Available for Sale, Due in one year or less, Amortized Cost	14,302
Available for Sale, Due after one year through five years, Amortized Cost	3,394,320
Available for Sale, Due after five years through ten years, Amortized Cost	201,784
Available for Sale, Due after ten years, Amortized Cost	1,667,476
Available for Sale, Residential mortgage-backed securities, Amortized Cost	2,789,723
Available for Sale, Equity securities, Amortized Cost	35,880
Available for Sale, Amortized Cost	8,103,485	7,440,389
Available for Sale, Due in one year or less, Estimated Fair Value	14,480
Available for Sale, Due after one year through five years, Estimated Fair Value	3,443,606
Available for Sale, Due after five years through ten years, Estimated Fair Value	217,308
Available for Sale, Due after ten years, Estimated Fair Value	1,817,098
Available for Sale, Residential mortgage-backed securities, Estimated Fair Value	2,947,395
Available for Sale, Equity securities, Estimated Fair Value	35,880
Available for Sale, Estimated Fair Value	$ 8,475,767	$ 7,789,700	$ 5,432,354

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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