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Investments (Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Investment securities available for sale: |  |
Fair Value, Less than 12 months | $ 1,778,244 | $ 3,104,700
Unrealized Losses, Less than 12 months | 4,023 | 43,715
Fair Value, 12 months or more | 1,090,467 | 56,830
Unrealized Losses, Greater than 12 months | 19,288 | 1,105
Fair Value, Total | 2,868,711 | 3,161,530
Unrealized Losses, Total | 23,311 | 44,820
U. S. Treasury |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 999,783 | 102,105
Unrealized Losses, Less than 12 months | 1,420 | 45
Fair Value, 12 months or more | 0 | 0
Unrealized Losses, Greater than 12 months | 0 | 0
Fair Value, Total | 999,783 | 102,105
Unrealized Losses, Total | 1,420 | 45
Government Agency |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 291,783 | 780,552
Unrealized Losses, Less than 12 months | 393 | 761
Fair Value, 12 months or more | 0 | 29,969
Unrealized Losses, Greater than 12 months | 0 | 31
Fair Value, Total | 291,783 | 810,521
Unrealized Losses, Total | 393 | 792
Mortgage Backed Securities, Other [Member] |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 486,678 | 2,221,213
Unrealized Losses, Less than 12 months | 2,210 | 42,876
Fair Value, 12 months or more | 1,090,467 | 26,861
Unrealized Losses, Greater than 12 months | 19,288 | 1,074
Fair Value, Total | 1,577,145 | 2,248,074
Unrealized Losses, Total | 21,498 | 43,950
Other Debt Obligations |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months |  | 830
Unrealized Losses, Less than 12 months |  | 33
Fair Value, 12 months or more |  | 0
Unrealized Losses, Greater than 12 months |  | 0
Fair Value, Total |  | 830
Unrealized Losses, Total | 0 | 33
State, County and Municipal |  |
Investment securities available for sale: |  |
Unrealized Losses, Total | $ 0 | $ 0

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity 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 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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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 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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