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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) security | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) security | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |  |  |
Proceeds from sale of available-for-sale securities |  |  | $ 87,300,000 | $ 0 | $ 87,300,000 |
Net realized gains resulting from sale of available-for-sale securities |  |  | 400,000 |  | 400,000 |
Unrealized gains (losses) recorded in accumulated other comprehensive loss | [1],[2],[3] | $ (11,856,000) | 3,770,000 | (24,927,000) | 7,547,000 |
Financial instruments pledged as collateral |  | $ 2,100,000,000 |  | $ 2,100,000,000 |  | $ 2,200,000,000
Number of available for sale securities whose amortized costs exceeded their fair values | security |  | 218 |  | 218 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses |  | $ 47,636,000 |  | $ 47,636,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses |  | 19,451,000 |  | 19,451,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | $ 1,688,082,000 |  | $ 1,688,082,000 |  |
Percentage of available-for-sale portfolio |  | 48.60% |  | 48.60% |  |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  | 116 |  | 116 |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | $ 47,846,000 |  | $ 47,846,000 |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | 34,182,000 |  | 34,182,000 |  |
Credit-related OTTI |  | 0 | $ 0 | 0 | $ 0 |
Gross unrealized losses related to investment portfolio |  |  |  | 95,500,000 |  |
Pledged [Member] |  |  |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |  |  |
Trading securities pledged |  | $ 2,300,000,000 |  | $ 2,300,000,000 |  | $ 2,000,000,000
[1] | Net of tax benefit of $6.0 million and tax expense of $3.7 million for the three months ended June 30, 2018 and 2017, respectively. Net of tax benefit of $8.3 million and tax expense of $8.5 million for the six months ended June 30, 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 risk. The reclassification is reflected in the activity for the six months ended June 30, 2018. See Note 2 for further details.
[3] | There were no reclassifications to earnings during the three and six months ended June 30, 2018 and 2017, respectively.

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