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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 | Dec. 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 | $ 143,462 |  | $ 6,861
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost | 134,040 |  | 229,184
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost | 247,907 |  | 422,236
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost | 429,921 |  | 409,664
Available-for-sale Securities, debt maturities, after ten years, Amortized Cost | 1,229,009 |  | 2,186,096
Available-for-sale Securities, debt maturities, Amortized Cost | 2,184,339 |  | 3,254,041
Available-for-sale Securities, debt maturities, within one year, Fair Value | 144,362 | [1] | 6,871
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value | 137,625 |  | 229,760
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value | 266,139 |  | 429,909
Available-for-sale Securities, debt maturities, after five through ten years, fair value | 435,111 | [1] | 411,680
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | 1,247,060 | [1] | 2,176,517
Available-for-sale Securities, debt maturities, Fair Value | 2,230,297 | [1] | 3,254,737
Held-to-maturity Securities, debt maturities, after three through five years, Amortized Cost | 17,460 |  |
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost | 1,932,439 |  | 598,250
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost | 2,167,485 |  | 2,257,969
Held-to-maturity Securities, Amortized cost | 4,117,384 |  | 2,856,219
Held-to-maturity Securities, debt maturities, after three through five years, Fair Value | 17,460 |  |
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value | 1,926,425 |  | 597,166
Held-to-maturity Securities, debt maturities, after ten years, Fair Value | 2,164,075 |  | 2,230,717
Held-to-maturity Securities, debt maturities, Fair Value | $ 4,107,960 |  | $ 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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