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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, 2020
Dec. 31, 2019
Investments Debt And Equity Securities [Abstract]    
Available-for-sale Securities, debt maturities, within one year, Amortized Cost $ 152,731 $ 6,861
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost 85,773 229,184
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost 302,285 422,236
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost 528,866 409,664
Available-for-sale Securities, debt maturities, after ten years, Amortized Cost 1,723,042 2,186,096
Available-for-sale Securities, debt maturities, Amortized Cost 2,792,697 3,254,041
Available-for-sale Securities, debt maturities, within one year, Fair Value 154,255 [1] 6,871
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value 88,263 229,760
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value 320,037 429,909
Available-for-sale Securities, debt maturities, after five through ten years, fair value 527,815 [1] 411,680
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,733,888 [1] 2,176,517
Available-for-sale Securities, debt maturities, Fair Value 2,824,258 [1] 3,254,737
Held-to-maturity Securities, debt maturities, after three through five years, Amortized Cost 6,537  
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost 1,302,344 598,250
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,088,832 2,257,969
Held-to-maturity Securities, Amortized cost 3,397,713 2,856,219
Held-to-maturity Securities, debt maturities, after three through five years, Fair Value 6,533  
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value 1,281,809 597,166
Held-to-maturity Securities, debt maturities, after ten years, Fair Value 2,046,691 2,230,717
Held-to-maturity Securities, debt maturities, Fair Value $ 3,335,033 $ 2,827,883
[1] Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.