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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | $ 841,842 | $ 301,101
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 49,223 | 1,727
Securities Available-for-Sale, 12 months or longer, Fair value |  |
Securities Available-for-Sale, 12 months or longer, Unrealized losses |  |
Securities Available-for-Sale, Fair value, Total | 841,842 | 301,101
Securities Available-for-Sale, Unrealized losses, Total | 49,223 | 1,727
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | 580,631 | 177,470
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 40,001 | 1,280
Securities Available-for-Sale, 12 months or longer, Fair value |  |
Securities Available-for-Sale, 12 months or longer, Unrealized losses |  |
Securities Available-for-Sale, Fair value, Total | 580,631 | 177,470
Securities Available-for-Sale, Unrealized losses, Total | 40,001 | 1,280
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | 261,211 | 123,631
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 9,222 | 447
Securities Available-for-Sale, 12 months or longer, Fair value |  |
Securities Available-for-Sale, 12 months or longer, Unrealized losses |  |
Securities Available-for-Sale, Fair value, Total | 261,211 | 123,631
Securities Available-for-Sale, Unrealized losses, Total | 9,222 | 447
Securities Held-to-Maturity, Less than 12 months, Fair value | 5,817 | 10,120
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 15 | 38
Securities Held-to-Maturity, 12 months or longer, Fair value |  |
Securities Held-to-Maturity, 12 months or longer, Unrealized losses |  |
Securities Held-to-Maturity, Fair value, Total | 5,817 | 10,120
Securities Held-to-Maturity, Unrealized losses, Total | $ 15 | $ 38

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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=27724398&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=27724398&loc=d3e27290-111563 + Details
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