Investment Securities (Expected Maturities Of Investment Securities Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Investment Securities [Abstract]
Available-for-sale, Maturity, Within one year, Amortized Cost	$ 83,163
Available-for-sale, Maturity, One to five years, Amortized Cost	114,548
Available-for-sale, Maturity, Five to ten years, Amortized Cost	348,768
Available-for-sale, Maturity, Beyond ten years, Amortized Cost	1,659,510
Available-for-sale, Amortized Cost	2,205,989
Held-to-maturity, Maturity, Within one year, Amortized Cost	3,049
Held-to-maturity, Maturity, One to five years, Amortized Cost	2,350
Held-to-maturity, Maturity, Five to ten years, Amortized Cost	148,411
Held-to-maturity, Maturity, Beyond ten years, Amortized Cost	318,567
Held-to-maturity, Amortized Cost	472,377
Available-for-sale, Maturity, Within one year, Fair Value	83,581
Available-for-sale, Maturity, One to five years, Fair Value	119,593
Available-for-sale, Maturity, Five to ten years, Fair Value	360,675
Available-for-sale, Maturity, Beyond ten years, Fair Value	1,688,333
Available-for-sale, Fair Value	2,252,182
Held-to-maturity, Maturity, Within one year, Fair Value	3,049
Held-to-maturity, Maturity, One to five years, Fair Value	2,410
Held-to-maturity, Maturity, Five to ten years, Fair Value	154,819
Held-to-maturity, Maturity, Beyond ten years, Fair Value	336,078
Held-to-maturity, Fair Value	$ 496,356
Available-for-sale, Maturity, Within one year, Weighted Average Yield	1.82%
Available-for-sale, Maturity, One to five years, Weighted Average Yield	3.35%
Available-for-sale, Maturity, Five to ten years, Weighted Average Yield	3.34%
Available-for-sale, Maturity, Beyond ten years, Weighted Average Yield	3.36%
Available-for-sale, Weighted Average Yield	3.30%
Held-to-maturity, Maturity, Within one year, Weighted Average Yield	2.27%
Held-to-maturity, Maturity, One to five years, Weighted Average Yield	3.29%
Held-to-maturity, Maturity, Five to ten years, Weighted Average Yield	2.95%
Held-to-maturity, Maturity, Beyond ten years, Weighted Average Yield	4.48%
Held-to-maturity, Weighted Average Yield	3.98%

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