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Investment Securities (Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 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)
Total debt securities |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 2,514,856 | 2,971,597
Less than 12 months, Unrealized Losses | (12,243) | (42,918)
12 months or longer, Fair Value | 1,164,073 | 116,527
12 months or longer, Unrealized Losses | (35,674) | (4,885)
Total Fair Value | 3,678,929 | 3,088,124
Total Unrealized Losses | (47,917) | (47,803)
U.S. treasuries |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | 99 |
Less than 12 months, Unrealized Losses | (1) |
12 months or longer, Fair Value | 0 |
12 months or longer, Unrealized Losses | 0 |
Total Fair Value | 99 |
Total Unrealized Losses | (1) |
Government agency issued mortgage-backed securities (“MBS”) |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | 1,455,476 | 1,059,471
Less than 12 months, Unrealized Losses | (4,738) | (19,052)
12 months or longer, Fair Value | 331,900 | 116,527
12 months or longer, Unrealized Losses | (8,866) | (4,885)
Total Fair Value | 1,787,376 | 1,175,998
Total Unrealized Losses | (13,604) | (23,937)
Government agency issued collateralized mortgage obligations (“CMO”) |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | 1,043,987 | 1,912,126
Less than 12 months, Unrealized Losses | (7,464) | (23,866)
12 months or longer, Fair Value | 832,173 | 0
12 months or longer, Unrealized Losses | (26,808) | 0
Total Fair Value | 1,876,160 | 1,912,126
Total Unrealized Losses | (34,272) | (23,866)
Corporates and other debt |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | 15,294 |
Less than 12 months, Unrealized Losses | (40) |
12 months or longer, Fair Value | 0 |
12 months or longer, Unrealized Losses | 0 |
Total Fair Value | 15,294 |
Total Unrealized Losses | $ (40) |
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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