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Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of The Available For Sale Securities And Held To Maturity Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized cost |  | $ 1,752,404 |  | $ 1,727,630
Available for sale securities, unrealized gains | [1] | 1,287 |  | 6
Available-for-sale Securities, Gross unrealized losses | [1] | (135,402) |  | (175,950)
Available-for-sale securities, at fair value |  | 1,618,289 | [2] | 1,551,686
Held-to-maturity securities, at amortized cost | [3] | 6,613,793 |  | 5,888,798
Held-to-maturity Securities, Gross unrealized gains | [1],[3] | 17,893 |  | 6,387
Held-to-maturity Securities, Gross unrealized losses | [1],[3] | (5,233) |  | (43,009)
Held-to-maturity securities, Estimated fair value | [3] | 6,626,453 |  | 5,852,176
U.S. Government Agency Securities [Member] |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized cost |  | 2,399 |  | 2,376
Available for sale securities, unrealized gains | [1] | 10 |  | 5
Available-for-sale Securities, Gross unrealized losses | [1] | (111) |  | (162)
Available-for-sale securities, at fair value |  | 2,298 |  | 2,219
State and Municipal Securities [Member] |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized cost |  | 2,350 |  | 2,350
Available for sale securities, unrealized gains | [1] | 1 |  | 1
Available-for-sale Securities, Gross unrealized losses | [1] | 0 |  | 0
Available-for-sale securities, at fair value |  | 2,351 |  | 2,351
Agency Mortgage-Backed Securities [Member] | Agency Securities [Member] |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized cost |  | 1,017,358 |  | 855,456
Available for sale securities, unrealized gains | [1] | 1,202 |  | 0
Available-for-sale Securities, Gross unrealized losses | [1] | (93,175) |  | (109,286)
Available-for-sale securities, at fair value |  | 925,385 | [2] | 746,170
Agency Mortgage-Backed Securities [Member] | Commercial [Member] |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized cost |  | 69,659 |  | 70,326
Available for sale securities, unrealized gains | [1] | 0 |  | 0
Available-for-sale Securities, Gross unrealized losses | [1] | (1,761) |  | (3,655)
Available-for-sale securities, at fair value |  | 67,898 | [2] | 66,671
Agency Mortgage-Backed Securities [Member] | Non-Agency [Member] |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized cost |  | 224 |  | 274
Available for sale securities, unrealized gains | [1] | 0 |  | 0
Available-for-sale Securities, Gross unrealized losses | [1] | (9) |  | (13)
Available-for-sale securities, at fair value |  | 215 | [2] | 261
Corporate Fixed Income Securities [Member] |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized cost |  | 526,303 |  | 615,131
Available for sale securities, unrealized gains | [1] | 0 |  | 0
Available-for-sale Securities, Gross unrealized losses | [1] | (39,486) |  | (58,970)
Available-for-sale securities, at fair value |  | 486,817 |  | 556,161
Asset-Backed Securities [Member] |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized cost |  | 134,111 |  | 181,717
Available for sale securities, unrealized gains | [1] | 74 |  | 0
Available-for-sale Securities, Gross unrealized losses | [1] | (860) |  | (3,864)
Available-for-sale securities, at fair value |  | 133,325 | [2] | $ 177,853
Held-to-maturity securities, at amortized cost | [2] | $ 6,613,793 |  |
[1] | Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive loss.
[2] | Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
[3] | 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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