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Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of Available-For-Sale Securities And Held-To-Maturity Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Investments Debt And Equity Securities [Abstract] |  |  |
Available-for-sale Securities, debt maturities, within one year, Amortized Cost | $ 46,942 |  | $ 6,861
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost | 174,027 |  | 229,184
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost | 288,460 |  | 422,236
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost | 488,368 |  | 409,664
Available-for-sale Securities, debt maturities, after ten years, Amortized Cost | 2,164,491 |  | 2,186,096
Available-for-sale Securities, debt maturities, Amortized Cost | 3,162,288 |  | 3,254,041
Available-for-sale Securities, debt maturities, within one year, Fair Value | 47,352 | [1] | 6,871
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value | 176,920 |  | 229,760
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value | 302,659 |  | 429,909
Available-for-sale Securities, debt maturities, after five through ten years, fair value | 484,418 | [1] | 411,680
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | 2,161,140 | [1] | 2,176,517
Available-for-sale Securities, debt maturities, Fair Value | 3,172,489 | [1] | 3,254,737
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost | 853,300 |  | 598,250
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost | 2,232,490 |  | 2,257,969
Held-to-maturity Securities, Amortized cost | 3,085,790 |  | 2,856,219
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value | 822,035 |  | 597,166
Held-to-maturity Securities, debt maturities, after ten years, Fair Value | 2,129,707 |  | 2,230,717
Held-to-maturity Securities, debt maturities, Fair Value | $ 2,951,742 |  | $ 2,827,883
[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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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(4) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120252992&loc=d3e62586-112803 + Details
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