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Investments (Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Investment securities available for sale: |  |
Fair Value, Less than 12 months | $ 3,114,052 | $ 3,104,700
Unrealized Losses, Less than 12 months | 33,609 | 43,715
Fair Value, 12 months or more | 23,622 | 56,830
Unrealized Losses, 12 months or more | 808 | 1,105
Fair Value, Total | 3,137,674 | 3,161,530
Unrealized Losses, Total | 34,417 | 44,820
U. S. Treasury |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 699,985 | 102,105
Unrealized Losses, Less than 12 months | 1,874 | 45
Fair Value, 12 months or more | 0 | 0
Unrealized Losses, 12 months or more | 0 | 0
Fair Value, Total | 699,985 | 102,105
Unrealized Losses, Total | 1,874 | 45
Government Agency |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 400,423 | 780,552
Unrealized Losses, Less than 12 months | 879 | 761
Fair Value, 12 months or more | 0 | 29,969
Unrealized Losses, 12 months or more | 0 | 31
Fair Value, Total | 400,423 | 810,521
Unrealized Losses, Total | 879 | 792
Mortgage Backed Securities, Other [Member] |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 2,012,814 | 2,221,213
Unrealized Losses, Less than 12 months | 30,816 | 42,876
Fair Value, 12 months or more | 23,622 | 26,861
Unrealized Losses, 12 months or more | 808 | 1,074
Fair Value, Total | 2,036,436 | 2,248,074
Unrealized Losses, Total | 31,624 | 43,950
Other Debt Obligations |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 830 | 830
Unrealized Losses, Less than 12 months | 40 | 33
Fair Value, 12 months or more | 0 | 0
Unrealized Losses, 12 months or more | 0 | 0
Fair Value, Total | 830 | 830
Unrealized Losses, Total | 40 | 33
State, County and Municipal |  |
Investment securities available for sale: |  |
Unrealized Losses, Total | $ 0 | $ 0

X
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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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