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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) security | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |
Proceeds from sale of available-for-sale securities |  | $ 0 | $ 0 |
Unrealized gains (losses) recorded in accumulated other comprehensive loss | [1] | 3,777 | (1,028) |
Financial instruments pledged as collateral |  | 1,900,000 |  | $ 2,000,000
Trading securities pledged |  | $ 1,900,000 |  | 1,700,000
Number of available for sale securities whose amortized costs exceeded their fair values | security |  | 130 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses |  | $ 17,357 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses |  | 4,545 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | $ 1,090,977 |  |
Percentage of available-for-sale portfolio |  | 32.30% |  |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  | 43 |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | $ 19,280 |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | 2,189 |  |
Credit-related OTTI |  | 0 | $ 0 |
Gross unrealized losses related to investment portfolio | [2] | 17,357 |  | $ 20,411
Available-for-sale and Held-to-maturity Securities [Member] |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |
Gross unrealized losses related to investment portfolio |  | $ 36,600 |  |
[1] | There were no reclassifications to earnings during the three months ended March 31, 2017 and 2016, respectively.
[2] | Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive loss.

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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=73527792&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=73527792&loc=d3e27290-111563 + Details
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