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Investments (Narrative) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) investments | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) investments | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Investments [Abstract] |  |  |  |  |
Securities gains (losses) | $ 12,529,000 | $ 147,000 | $ 17,157,000 | $ 5,273,000 |
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 | 197,332,000 |  | 197,332,000 |  | 280,126,000
Unrealized Losses, Greater than 12 months | $ 1,039,000 |  | $ 1,039,000 |  | 6,094,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | investments | 36 |  | 36 |  |
Investment value deemed to be OTTI | $ 0 |  | $ 0 |  |
Investment securities, aggregate carrying value, pledged as collateral | $ 4,770,000,000 |  | $ 4,770,000,000 |  | $ 4,730,000,000

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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=73527792&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=73527792&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=73527792&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=73527792&loc=d3e27337-111563 + Details
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