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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) security | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Investments Debt And Equity Securities [Abstract] |  |  |  |
Proceeds from sale of available-for-sale securities |  | $ 0 | $ 0 |
Unrealized gains (losses) recorded in accumulated other comprehensive loss | [1],[2],[3] | (13,071,000) | 3,777,000 |
Financial instruments pledged as collateral |  | 2,100,000,000 |  | $ 2,200,000,000
Trading securities pledged |  | $ 2,100,000,000 |  | $ 2,000,000,000
Number of available for sale securities whose amortized costs exceeded their fair values | security |  | 226 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses |  | $ 38,541,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses |  | 17,931,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | $ 1,564,910,000 |  |
Percentage of available-for-sale portfolio |  | 42.10% |  |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  | 62 |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | $ 33,904,000 |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | 30,505,000 |  |
Credit-related OTTI |  | 0 | $ 0 |
Gross unrealized losses related to investment portfolio |  | $ 72,400,000 |  |
[1] | Net of tax benefit of $2.3 million and tax expense of $4.8 million for the three months ended March 31, 2018 and 2017, respectively.
[2] | The adoption of ASU 2018-02 on January 1, 2018 resulted in a reclassification of $3.0 million to retained earnings related to cash flow hedges and investment portfolio credit risk. See Note 2 for further details.
[3] | There were no reclassifications to earnings during the three months ended March 31, 2018 and 2017, respectively.

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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=82897076&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=82897076&loc=d3e27290-111563 + Details
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