Investment Securities (Expected Maturities Of Investment Securities Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Investment Securities [Abstract]
Available-for-sale, Maturity Within one year, Amortized Cost	$ 79,212	$ 70,326
Available-for-sale, Maturity One to five years, Amortized Cost	123,174	828,636
Available-for-sale, Maturity Five to ten years, Amortized Cost	240,215	441,900
Available-for-sale, Maturity Beyond ten years, Amortized Cost	1,588,200	612,980
Available-for-sale, Amortized Cost	2,030,801	1,953,842
Held-to-maturity, Maturity Within one year, Amortized Cost	4,075	71
Held-to-maturity, Maturity one to five years, Amortized Cost	4,819	117,833
Held-to-maturity, Maturity five to ten years, Amortized Cost	151,395	12,248
Held-to-maturity, Maturity beyond ten years, Amortized Cost	324,301	508,058
Held-to-maturity, Amortized Cost	484,590	638,210
Available-for-sale, Maturity within one year, Fair Value	79,668	70,865
Available-for-sale, Maturity one to five years, Fair Value	127,761	850,288
Available-for-sale, Maturity five to ten years, Fair Value	252,434	444,474
Available-for-sale, Maturity beyond ten years, Fair Value	1,611,413	594,595
Available-for-sale, Fair Value	2,071,276	1,960,222
Held-to-maturity, Maturity within one year, Fair Value	4,073	56
Held-to-maturity, Maturity one to five years, Fair Value	4,861	119,724
Held-to-maturity, Maturity five to ten years, Fair Value	158,366	11,785
Held-to-maturity, Maturity beyond ten years, Fair Value	340,399	494,078
Held-to-maturity, Fair Value	$ 507,699	$ 625,643
Available-for-sale, Maturity within one year, Weighted Average Yield	1.61%	3.24%
Available-for-sale, Maturity one to five years, Weighted Average Yield	3.38%	3.51%
Available-for-sale, Maturity five to ten years, Weighted Average Yield	3.86%	3.97%
Available-for-sale, Maturity beyond ten years, Weighted Average Yield	3.32%	4.97%
Available-for-sale, Weighted Average Yield	3.32%	4.06%
Held-to-maturity, Maturity within one year, Weighted Average Yield	1.48%	2.67%
Held-to-maturity, Maturity one to five years, Weighted Average Yield	2.60%	3.65%
Held-to-maturity, Maturity five to ten years, Weighted Average Yield	2.97%	3.91%
Held-to-maturity, Maturity beyond ten years, Weighted Average Yield	4.47%	3.88%
Held-to-maturity, Weighted Average Yield	3.96%	3.84%

Available For Sale Securities Debt Maturities After Five Through Ten Years Weighted Average Yield

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