Investment Securities (Expected Maturities Of Investment Securities Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Investment Securities [Abstract]
Available-for-sale, Maturity, Within one year, Amortized Cost	$ 29,958
Available-for-sale, Maturity, One to five years, Amortized Cost	90,576
Available-for-sale, Maturity, Five to ten years, Amortized Cost	435,110
Available-for-sale, Maturity, Beyond ten years, Amortized Cost	1,600,241
Available-for-sale, Amortized Cost	2,155,885
Held-to-maturity, Maturity, Within one year, Amortized Cost	3,045
Held-to-maturity, Maturity, One to five years, Amortized Cost	2,341
Held-to-maturity, Maturity, Five to ten years, Amortized Cost	145,765
Held-to-maturity, Maturity, Beyond ten years, Amortized Cost	312,784
Held-to-maturity, Amortized Cost	463,935
Available-for-sale, Maturity, Within one year, Fair Value	30,218
Available-for-sale, Maturity, One to five years, Fair Value	95,381
Available-for-sale, Maturity, Five to ten years, Fair Value	449,338
Available-for-sale, Maturity, Beyond ten years, Fair Value	1,633,325
Available-for-sale, Fair Value	2,208,262
Held-to-maturity, Maturity, Within one year, Fair Value	3,045
Held-to-maturity, Maturity, One to five years, Fair Value	2,415
Held-to-maturity, Maturity, Five to ten years, Fair Value	153,132
Held-to-maturity, Maturity, Beyond ten years, Fair Value	335,112
Held-to-maturity, Fair Value	$ 493,704
Available-for-sale, Maturity, Within one year, Weighted Average Yield	3.69%
Available-for-sale, Maturity, One to five years, Weighted Average Yield	3.65%
Available-for-sale, Maturity, Five to ten years, Weighted Average Yield	3.02%
Available-for-sale, Maturity, Beyond ten years, Weighted Average Yield	3.33%
Available-for-sale, Weighted Average Yield	3.29%
Held-to-maturity, Maturity, Within one year, Weighted Average Yield	2.25%
Held-to-maturity, Maturity, One to five years, Weighted Average Yield	3.29%
Held-to-maturity, Maturity, Five to ten years, Weighted Average Yield	2.94%
Held-to-maturity, Maturity, Beyond ten years, Weighted Average Yield	4.50%
Held-to-maturity, Weighted Average Yield	3.99%

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