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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 | Jun. 30, 2021 | Dec. 31, 2020
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Investments Debt And Equity Securities [Abstract] |  |  |
Available-for-sale Securities, debt maturities, within one year, Amortized Cost | $ 110,790 |  | $ 143,462
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost | 200,105 |  | 134,040
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost | 155,783 |  | 247,907
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost | 454,812 |  | 429,921
Available-for-sale Securities, debt maturities, after ten years, Amortized Cost | 1,320,137 |  | 1,229,009
Available-for-sale Securities, debt maturities, Amortized Cost | 2,241,627 |  | 2,184,339
Available-for-sale Securities, debt maturities, within one year, Fair Value | 111,102 | [1] | 144,362
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value | 206,467 |  | 137,625
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value | 165,832 |  | 266,139
Available-for-sale Securities, debt maturities, after five through ten years, fair value | 462,396 | [1] | 435,111
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | 1,334,360 | [1] | 1,247,060
Available-for-sale Securities, debt maturities, Fair Value | 2,280,157 | [1] | 2,230,297
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 | 2,127,088 |  | 1,932,439
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost | 2,860,524 |  | 2,167,485
Held-to-maturity Securities, Amortized cost | 4,987,612 |  | 4,117,384
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 | 2,123,921 |  | 1,926,425
Held-to-maturity Securities, debt maturities, after ten years, Fair Value | 2,868,218 |  | 2,164,075
Held-to-maturity Securities, debt maturities, Fair Value | $ 4,992,139 |  | $ 4,107,960
[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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