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Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost Of Held-To-Maturity Securities By Credit Quality Indicator) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity securities, at amortized cost |  | $ 4,761,401 | $ 4,117,384
Asset-Backed Securities [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity securities, at amortized cost | [1] | 4,761,401 | $ 4,117,384
Asset-Backed Securities [Member] | AAA [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity securities, at amortized cost |  | 1,280,256 |
Asset-Backed Securities [Member] | AA [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity securities, at amortized cost |  | 3,445,799 |
Asset-Backed Securities [Member] | A [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity securities, at amortized cost |  | 32,855 |
Asset-Backed Securities [Member] | C [Member] |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |
Held-to-maturity securities, at amortized cost |  | $ 2,491 |
[1] | 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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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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