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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) security | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) security | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |  |  |
Proceeds from sale of available-for-sale securities |  | $ 55,400 | $ 0 | $ 55,400 | $ 87,300 |
Net realized gains (loss) resulting from sale of available-for-sale securities |  | (400) |  | (400) | 400 |
Unrealized gains (losses) recorded in accumulated other comprehensive loss | [1],[2],[3] | (3,138) | 4,736 | (28,065) | 12,283 |
Financial instruments pledged as collateral |  | $ 2,000,000 |  | $ 2,000,000 |  | $ 2,200,000
Number of available for sale securities whose amortized costs exceeded their fair values | security |  | 232 |  | 232 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses |  | $ 49,209 |  | $ 49,209 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses |  | 26,542 |  | 26,542 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | $ 1,764,637 |  | $ 1,764,637 |  |
Percentage of available-for-sale portfolio |  | 52.70% |  | 52.70% |  |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  | 152 |  | 152 |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | $ 64,008 |  | $ 64,008 |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | 39,563 |  | 39,563 |  |
Credit-related OTTI |  | 0 | $ 0 | 0 | $ 0 |
Gross unrealized losses related to investment portfolio |  |  |  | 113,200 |  |
Pledged [Member] |  |  |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |  |  |
Trading securities pledged |  | $ 2,100,000 |  | $ 2,100,000 |  | $ 2,000,000
[1] | Net of tax benefit of $2.1 million and tax expense of $5.0 million for the three months ended September 30, 2018 and 2017, respectively. Net of tax benefit of $10.4 million and tax expense of $13.5 million for the nine months ended September 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 nine months ended September 30, 2018. See Note 2 for further details.
[3] | There were no reclassifications to earnings during the three and nine months ended September 30, 2018 and 2017, respectively.

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