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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, 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 | $ 36,671 |  | $ 143,462
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost | 217,606 |  | 134,040
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost | 192,271 |  | 247,907
Available-for-sale Securities, debt maturities, after five year through ten years, Amortized Cost | 455,429 |  | 429,921
Available-for-sale Securities, debt maturities, after ten years, Amortized Cost | 1,202,536 |  | 1,229,009
Available-for-sale Securities, Amortized cost | 2,104,513 |  | 2,184,339
Available-for-sale Securities, debt maturities, within one year, Fair Value | 36,899 | [1] | 144,362
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value | 222,942 |  | 137,625
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value | 196,380 |  | 266,139
Available-for-sale Securities, debt maturities, after five year through ten years, fair value | 455,848 | [1] | 435,111
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | 1,201,824 | [1] | 1,247,060
Available-for-sale Securities, debt maturities, Fair Value | 2,113,893 | [1] | 2,230,297
Held-to-maturity Securities, debt maturities, after three through five years, Amortized Cost | 2,825 |  | 17,460
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost | 2,282,162 |  | 1,932,439
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost | 3,063,571 |  | 2,167,485
Held-to-maturity Securities, Amortized cost | 5,348,558 | [2] | 4,117,384
Held-to-maturity Securities, debt maturities, after three through five years, Fair Value | 2,825 |  | 17,460
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value | 2,278,597 |  | 1,926,425
Held-to-maturity Securities, debt maturities, after ten years, Fair Value | 3,062,059 |  | 2,164,075
Held-to-maturity Securities, debt maturities, Fair Value | $ 5,343,481 | [2] | $ 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.
[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.

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