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Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of Available-For-Sale Securities And Held-To-Maturity Securities By Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]    
Available-for-sale Securities, debt maturities, Amortized Cost $ 2,702,416  
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 2,593  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 523,922  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,600,236  
Available-for-sale Securities, debt maturities, Fair Value [1] 2,703,060  
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost 713,786  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,199,289  
Held-to-maturity Securities, Amortized cost [2] 3,960,714 $ 4,218,854
Held-to-maturity Securities, debt maturities, Fair Value [2] 3,946,782 $ 4,122,907
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 699  
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost 177,610  
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost 392,026  
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost 511,594  
Availably-for-sale Securities, debt maturities, after ten years, Amortized Cost 1,339,773  
Available-for-sale Securities, debt maturities, within one year, Fair Value 699  
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value 177,324  
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value 394,578  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 518,641  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,332,268  
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost 564,030  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,243,180  
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value 562,785  
Held-to-maturity Securities, debt maturities, after ten years, Fair Value 2,224,440  
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 1,318  
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost 3,371  
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost 987  
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost 5,339  
Availably-for-sale Securities, debt maturities, after ten years, Amortized Cost 269,699  
Available-for-sale Securities, debt maturities, within one year, Fair Value 1,894  
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value 3,411  
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value 996  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 5,281  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 267,968  
Held-to-maturity Securities, debt maturities, after one year through three years, Amortized Cost 47,639  
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost 149,756  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 956,109  
Held-to-maturity Securities, debt maturities, after one year through three years, Fair Value 48,531  
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value 150,460  
Held-to-maturity Securities, debt maturities, after ten years, Fair Value $ 960,566  
[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.