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Investment Securities (Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 2,914,364 | $ 2,971,604
Less than 12 months, Unrealized Losses | (44,124) | (42,920)
12 months or longer, Fair Value | 111,813 | 116,527
12 months or longer, Unrealized Losses | (5,001) | (4,885)
Total Fair Value | 3,026,177 | 3,088,131
Total Unrealized Losses | (49,125) | (47,805)
Government Agency Issued Collateralized Mortgage Obligations ("CMO") |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | 1,068,010 | 1,059,471
Less than 12 months, Unrealized Losses | (18,525) | (19,052)
12 months or longer, Fair Value | 111,813 | 116,527
12 months or longer, Unrealized Losses | (5,001) | (4,885)
Total Fair Value | 1,179,823 | 1,175,998
Total Unrealized Losses | (23,526) | (23,937)
Government Agency Issued Mortgage-Backed Securities ("MBS") |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | 1,846,348 | 1,912,126
Less than 12 months, Unrealized Losses | (25,596) | (23,866)
12 months or longer, Fair Value | 0 | 0
12 months or longer, Unrealized Losses | 0 | 0
Total Fair Value | 1,846,348 | 1,912,126
Total Unrealized Losses | (25,596) | (23,866)
Total debt securities |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | 2,914,358 | 2,971,597
Less than 12 months, Unrealized Losses | (44,121) | (42,918)
12 months or longer, Fair Value | 111,813 | 116,527
12 months or longer, Unrealized Losses | (5,001) | (4,885)
Total Fair Value | 3,026,171 | 3,088,124
Total Unrealized Losses | (49,122) | (47,803)
Equity |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | 6 | 7
Less than 12 months, Unrealized Losses | (3) | (2)
12 months or longer, Fair Value | 0 | 0
12 months or longer, Unrealized Losses | 0 | 0
Total Fair Value | 6 | 7
Total Unrealized Losses | $ (3) | $ (2)

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a 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 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + 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 + Details
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