Securities (Amortized Cost And Estimated Fair Value Of Securities, Excluding Trading Securities, Presented By Contractual Maturity) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 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	251,039
Held to Maturity, Due after ten years, Amortized Cost	102,147
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	282,332
Held to Maturity, Due after ten years, Estimated Fair Value	107,641
Residential mortgage-backed Securities, Held To Maturity, Amortized Cost	12,081
Residential mortgage-backed securities, Held to Maturity, Estimated Fair Value	12,232
Held to Maturity, Amortized Cost	366,267	283,629	256,724
Held to Maturity, Estimated Fair Value	403,205	296,228
Available for Sale, Due in one year or less, Amortized Cost	32,816
Available for Sale, Due after one year through five years, Amortized Cost	831,398
Available for Sale, Due after five years through ten years, Amortized Cost	174,398
Available for Sale, Due after ten years, Amortized Cost	1,707,746
Residential mortgage-backed securities, Available For Sale, Amortized Cost	2,244,650
Equity securities, Available for Sale, Amortized Cost	37,992
Available for Sale, Due in one year or less, Estimated Fair Value	33,229
Available for Sale, Due after one year through five years, Estimated Fair Value	861,967
Available for Sale, Due after five years through ten years, Estimated Fair Value	187,265
Available for Sale, Due after ten years, Estimated Fair Value	1,825,021
Residential mortgage-backed securities, Available for Sale, Estimated Fair Value	2,394,338
Equity securities, Available for Sale, Estimated Fair Value	37,992
Available for Sale, Amortized Cost	5,029,000	5,009,759
Available for Sale, Estimated Fair Value	$ 5,339,812	$ 5,157,470	$ 5,255,006

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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Securities

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