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Investments (Narrative) (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) investments | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) investments | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Investments [Abstract] |  |  |  |  |
Securities gains (losses) | $ 5,564,000 | $ 0 | $ 10,837,000 | $ 0 |
Unrealized Losses Related to Marketability of Securities or Issuer's Ability to Honor Redemption Obligations | 0 |  | 0 |  | $ 0
Fair Value, 12 months or more in unrealized loss position | 300,157,000 |  | 300,157,000 |  | 832,420,000
Unrealized Losses, Greater than 12 months | $ 3,895,000 |  | $ 3,895,000 |  | 10,043,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | investments | 40 |  | 40 |  |
Investment value deemed to be OTTI | $ 0 |  | $ 0 |  |
Investment securities, aggregate carrying value, pledged as collateral | $ 4,750,000,000 |  | $ 4,750,000,000 |  | $ 4,370,000,000

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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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: 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 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized 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)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: 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 + Details
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