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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 | Jun. 30, 2021 | Dec. 31, 2020
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized cost |  | $ 2,241,627 | $ 2,184,339
Available for sale securities, unrealized gains | [1] | 44,640 | 51,549
Available-for-sale Securities, Gross unrealized losses | [1] | (6,110) | (5,591)
Available-for-sale securities |  | 2,280,157 | 2,230,297
Held-to-maturity Securities, Amortized cost |  | 4,987,612 | 4,117,384
Held-to-maturity securities, Estimated fair value |  | 4,992,139 | 4,107,960
U.S. Government Agency Securities [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized cost |  | 3,148 | 4,293
Available for sale securities, unrealized gains | [1] | 32 | 68
Available-for-sale securities |  | 3,180 | 4,361
State And Municipal Securities [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized cost |  | 2,384 | 2,395
Available for sale securities, unrealized gains | [1] | 46 | 58
Available-for-sale securities |  | 2,430 | 2,453
Agency Mortgage-Backed Securities [Member] | Agency Securities |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized cost |  | 1,000,745 | 777,025
Available for sale securities, unrealized gains | [1] | 14,825 | 16,401
Available-for-sale Securities, Gross unrealized losses | [1] | (3,694) | (16)
Available-for-sale securities |  | 1,011,876 | 793,410
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 |  | 77,413 | 91,237
Available for sale securities, unrealized gains | [1] | 3,171 | 4,376
Available-for-sale Securities, Gross unrealized losses | [1] | (23) |
Available-for-sale securities |  | 80,561 | 95,613
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 |  | 1,754 | 4,550
Available for sale securities, unrealized gains | [1] |  | 28
Available-for-sale Securities, Gross unrealized losses | [1] | (2) | (9)
Available-for-sale securities |  | 1,752 | 4,569
Corporate Fixed Income Securities [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized cost |  | 787,357 | 604,662
Available for sale securities, unrealized gains | [1] | 22,851 | 27,096
Available-for-sale Securities, Gross unrealized losses | [1] | (639) |
Available-for-sale securities |  | 809,569 | 631,758
Asset-Backed Securities [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized cost |  | 368,826 | 700,177
Available for sale securities, unrealized gains | [1] | 3,715 | 3,522
Available-for-sale Securities, Gross unrealized losses | [1] | (1,752) | (5,566)
Available-for-sale securities |  | 370,789 | 698,133
Held-to-maturity Securities, Amortized cost | [2] | 4,987,612 | 4,117,384
Held-to-maturity Securities, Gross unrealized gains | [2] | 10,399 | 8,111
Held-to-maturity Securities, Gross unrealized losses | [2] | (5,872) | (17,535)
Held-to-maturity securities, Estimated fair value | [2] | $ 4,992,139 | $ 4,107,960
[1] | Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive loss.
[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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