Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]
Available-for-sale Securities, debt maturities, Amortized Cost		$ 663,772
Available-for-sale Securities, debt maturities, within one year, Fair Value	[1]	9,816
Available-for-sale Securities, debt maturities, after five through ten years, fair value	[1]	157,319
Availably-for-sale Securities, debt maturities, after ten years, Fair Value	[1]	442,075
Available-for-sale Securities, debt maturities, Fair Value	[1]	659,832
Held-to-maturity Securities, debt maturities, within one year, Amortized Cost		15,006
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost		59,506
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		981,119
Held-to-maturity Securities, Amortized cost	[2]	1,095,793	$ 1,177,565
Held-to-maturity Securities, debt maturities, Fair Value	[2]	1,132,502	$ 1,211,976
Excluding Mortgage Backed Securities
Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]
Available-for-sale Securities, debt maturities, within one year, Amortized Cost		9,756
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost		48,743
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost		1,006
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost		158,380
Availably-for-sale Securities, debt maturities, after ten years, Amortized Cost		397,868
Available-for-sale Securities, debt maturities, within one year, Fair Value		9,816
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value		49,321
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value		1,220
Available-for-sale Securities, debt maturities, after five through ten years, fair value		156,642
Availably-for-sale Securities, debt maturities, after ten years, Fair Value		394,644
Held-to-maturity Securities, debt maturities, within one year, Amortized Cost		15,006
Held-to-maturity Securities, debt maturities, after one year through three years, Amortized Cost		40,162
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		177,617
Held-to-maturity Securities, debt maturities, within one year, Fair Value		15,004
Held-to-maturity Securities, debt maturities, after one year through three years, Fair Value		39,779
Held-to-maturity Securities, debt maturities, after ten years, Fair Value		177,133
Mortgage-backed securities [Member]
Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost		80
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost		653
Availably-for-sale Securities, debt maturities, after ten years, Amortized Cost		47,286
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value		81
Available-for-sale Securities, debt maturities, after five through ten years, fair value		677
Availably-for-sale Securities, debt maturities, after ten years, Fair Value		47,431
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost		59,506
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost		803,502
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value		62,667
Held-to-maturity Securities, debt maturities, after ten years, Fair Value		$ 837,919

[1] Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.

[2] Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.