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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
Jun. 30, 2018
Dec. 31, 2017
Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]    
Available-for-sale Securities, debt maturities, Amortized Cost $ 3,514,097  
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 76,617  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 790,509  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,961,249  
Available-for-sale Securities, debt maturities, Fair Value [1] 3,475,436  
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost 718,259  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,743,992  
Held-to-maturity Securities, Amortized cost [2] 4,519,985 $ 3,698,098
Held-to-maturity Securities, debt maturities, Fair Value [2] 4,478,399 $ 3,710,478
Excluding Mortgage Backed Securities [Member]    
Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Amortized Cost 76,821  
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost 344,701  
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost 316,001  
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost 802,601  
Availably-for-sale Securities, debt maturities, after ten years, Amortized Cost 1,631,436  
Available-for-sale Securities, debt maturities, within one year, Fair Value 76,617  
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value 338,138  
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value 308,923  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 789,543  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,630,086  
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost 526,011  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,635,864  
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value 526,945  
Held-to-maturity Securities, debt maturities, after ten years, Fair Value 2,632,655  
Mortgage Backed Securities [Member]    
Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]    
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost 1,007  
Availably-for-sale Securities, debt maturities, after ten years, Amortized Cost 341,530  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 966  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 331,163  
Held-to-maturity Securities, debt maturities, after three year through five years, Amortized Cost 57,734  
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost 192,248  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 1,108,128  
Held-to-maturity Securities, debt maturities, after three year through five years, Fair Value 57,622  
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value 186,159  
Held-to-maturity Securities, debt maturities, after ten years, Fair Value $ 1,075,018  
[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.