Securities (Amortized Cost And Estimated Fair Value Of Securities, Excluding Trading Securities, Presented By Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Securities [Abstract]
Held to Maturity, Due after one year through five years, Amortized Cost	$ 1,000
Held to Maturity, Due after five years through ten years, Amortized Cost	251,126
Held to Maturity, Due after ten years, Amortized Cost	101,996
Held to Maturity, Due after one year through five years, Estimated Fair Value	1,000
Held to Maturity, Due after five years through ten years, Estimated Fair Value	283,161
Held to Maturity, Due after ten years, Estimated Fair Value	108,273
Residential mortgage-backed Securities, Held to Maturity, Amortized Cost	11,874
Residential mortgage-backed Securities, Held to Maturity, Estimated Fair Value	12,027
Securities Held to Maturity, Amortized Cost	365,996	283,629
Securities Held to Maturity, Estimated Fair Value	404,461	296,228
Available for Sale, Due in one year or less, Amortized Cost	41,078
Available for Sale, Due after one year through five years, Amortized Cost	2,342,618
Available for Sale, Due after five years through ten years, Amortized Cost	195,338
Available for Sale, Due after ten years, Amortized Cost	1,688,290
Residential mortgage-backed securities, Available For Sale, Amortized Cost	3,135,064
Equity securities, Available for Sale, Amortized Cost	38,001
Available for Sale, Due in one year or less, Estimated Fair Value	41,306
Available for Sale, Due after one year through five years, Estimated Fair Value	2,384,191
Available for Sale, Due after five years through ten years, Estimated Fair Value	211,452
Available for Sale, Due after ten years, Estimated Fair Value	1,825,480
Residential mortgage-backed securities, Available for Sale, Estimated Fair Value	3,289,270
Equity securities, Available for Sale, Estimated Fair Value	38,001
Securities Available for Sale, Amortized Cost	7,440,389	5,009,759
Securities Available for Sale, Estimated Fair Value	$ 7,789,700	$ 5,157,470

Mortgage-backed securities Available For Sale, Amortized Cost

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Mortgage Backed Securities Held To Maturity Net Carrying Amount

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For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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