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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 | Mar. 31, 2020 | Dec. 31, 2019
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Investments Debt And Equity Securities [Abstract] |  |  |
Available-for-sale Securities, debt maturities, within one year, Amortized Cost | $ 26,838 |  | $ 6,861
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost | 261,013 |  | 229,184
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost | 422,686 |  | 422,236
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost | 478,472 |  | 409,664
Available-for-sale Securities, debt maturities, after ten years, Amortized Cost | 2,275,260 |  | 2,186,096
Available-for-sale Securities, debt maturities, Amortized Cost | 3,464,269 |  | 3,254,041
Available-for-sale Securities, debt maturities, within one year, Fair Value | 26,980 | [1] | 6,871
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value | 259,331 |  | 229,760
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value | 412,819 |  | 429,909
Available-for-sale Securities, debt maturities, after five through ten years, fair value | 453,334 | [1] | 411,680
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | 2,213,626 | [1] | 2,176,517
Available-for-sale Securities, debt maturities, Fair Value | 3,366,090 | [1] | 3,254,737
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost | 686,300 |  | 598,250
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost | 2,399,524 |  | 2,257,969
Held-to-maturity Securities, Amortized cost | 3,085,824 |  | 2,856,219
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value | 618,937 |  | 597,166
Held-to-maturity Securities, debt maturities, after ten years, Fair Value | 2,078,893 |  | 2,230,717
Held-to-maturity Securities, debt maturities, Fair Value | $ 2,697,830 |  | $ 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.

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