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Investment Securities (Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 1,782,008 | $ 349,413
Less than 12 months, Unrealized Losses | (47,083) | (1,391)
12 months or longer, Fair Value | 77,904 | 0
12 months or longer, Unrealized Losses | (4,315) | 0
Total Fair Value | 1,859,912 | 349,413
Total Unrealized Losses | (51,398) | (1,391)
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | 1,637,064 | 305,318
Less than 12 months, Unrealized Losses | (43,221) | (1,010)
12 months or longer, Fair Value | 77,904 | 0
12 months or longer, Unrealized Losses | (4,315) | 0
Total Fair Value | 1,714,968 | 305,318
Total Unrealized Losses | (47,536) | (1,010)
Mortgage Backed Securities Issued By U S Government Sponsored Enterprises [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | 144,901 | 44,095
Less than 12 months, Unrealized Losses | (3,839) | (381)
12 months or longer, Fair Value | 0 | 0
12 months or longer, Unrealized Losses | 0 | 0
Total Fair Value | 144,901 | 44,095
Total Unrealized Losses | (3,839) | (381)
Total debt securities |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | 1,781,965 |
Less than 12 months, Unrealized Losses | (47,060) |
12 months or longer, Fair Value | 77,904 |
12 months or longer, Unrealized Losses | (4,315) |
Total Fair Value | 1,859,869 |
Total Unrealized Losses | (51,375) |
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Less than 12 months, Fair Value | 43 |
Less than 12 months, Unrealized Losses | (23) |
12 months or longer, Fair Value | 0 |
12 months or longer, Unrealized Losses | 0 |
Total Fair Value | 43 |
Total Unrealized Losses | $ (23) |

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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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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months. + References Reference 1: 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=27724398&loc=d3e27337-111563 Reference 2: 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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