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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
Sep. 30, 2019
Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]    
Available-for-sale Securities, debt maturities, within one year, Amortized Cost $ 1,899 $ 5,872
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost 226,534 234,101
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost 413,589 407,507
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost 412,619 469,566
Available-for-sale Securities, debt maturities, after ten years, Amortized Cost 2,396,020 2,008,528
Available-for-sale Securities, debt maturities, Amortized Cost 3,450,661 3,125,574
Available-for-sale Securities, debt maturities, within one year, Fair Value 1,897 [1] 5,855
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value 226,822 227,951
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value 419,809 397,372
Available-for-sale Securities, debt maturities, after five through ten years, fair value 415,878 [1] 458,442
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 2,384,395 [1] 1,980,827
Available-for-sale Securities, debt maturities, Fair Value 3,448,801 [1] 3,070,447
Held-to-maturity Securities, debt maturities, after one year through three years, Amortized Cost   51,524
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost 495,850 536,717
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,385,634 3,630,613
Held-to-maturity Securities, Amortized cost 2,881,484 4,218,854 [2]
Held-to-maturity Securities, debt maturities, after one year through three years, Fair Value   51,709
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value 494,530 530,616
Held-to-maturity Securities, debt maturities, after ten years, Fair Value 2,361,261 3,540,582
Held-to-maturity Securities, debt maturities, Fair Value $ 2,855,791 $ 4,122,907 [2]
[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.