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Investment Securities (Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value |  | $ 2,971,604
Less than 12 months, Unrealized Losses |  | (42,920)
12 months or longer, Fair Value |  | 116,527
12 months or longer, Unrealized Losses |  | (4,885)
Total Fair Value |  | 3,088,131
Total Unrealized Losses |  | (47,805)
Government Agency Issued Collateralized Mortgage Obligations ("CMO") |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 885,926 | 1,059,471
Less than 12 months, Unrealized Losses | (10,936) | (19,052)
12 months or longer, Fair Value | 311,471 | 116,527
12 months or longer, Unrealized Losses | (8,831) | (4,885)
Total Fair Value | 1,197,397 | 1,175,998
Total Unrealized Losses | (19,767) | (23,937)
Government Agency Issued Mortgage-Backed Securities ("MBS") |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | 875,307 | 1,912,126
Less than 12 months, Unrealized Losses | (8,770) | (23,866)
12 months or longer, Fair Value | 34,184 | 0
12 months or longer, Unrealized Losses | (1,395) | 0
Total Fair Value | 909,491 | 1,912,126
Total Unrealized Losses | (10,165) | (23,866)
Total debt securities |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | 1,761,233 | 2,971,597
Less than 12 months, Unrealized Losses | (19,706) | (42,918)
12 months or longer, Fair Value | 345,655 | 116,527
12 months or longer, Unrealized Losses | (10,226) | (4,885)
Total Fair Value | 2,106,888 | 3,088,124
Total Unrealized Losses | $ (29,932) | (47,803)
Equity |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value |  | 7
Less than 12 months, Unrealized Losses |  | (2)
12 months or longer, Fair Value |  | 0
12 months or longer, Unrealized Losses |  | 0
Total Fair Value |  | 7
Total Unrealized Losses |  | $ (2)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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