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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |
Proceeds from sale of available-for-sale securities |  | $ 372,400 | $ 87,300 | $ 0
Net realized gains (loss) resulting from sale of available-for-sale securities |  | (3,900) | 400 |
Unrealized gains (losses) recorded in accumulated other comprehensive loss | [1],[2],[3] | (36,254) | 4,730 | 5,803
Financial instruments pledged as collateral |  | $ 1,900,000 | 2,200,000 |
Number of available for sale securities whose amortized costs exceeded their fair values | security |  | 258 |  |
Available-for-sale Securities, Continuous |  | $ 55,904 |  |
Available-for-sale Securities, Continuous Unrealized |  | 33,930 |  |
Available-for-sale Securities, Continuous |  | $ 2,626,686 |  |
Percentage of available-for-sale portfolio |  | 85.50% |  |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security |  | 196 |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | $ 102,024 |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | 30,205 |  |
Credit-related OTTI |  | 0 | 0 | $ 0
Gross unrealized losses related to investment portfolio |  | 157,900 |  |
Pledged [Member] |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |
Trading securities pledged |  | $ 1,600,000 | $ 2,000,000 |
[1] | Amounts are net of reclassifications to earnings of realized losses of $2.9 and realized gains of $0.2 million for the years ended December 31, 2018 and 2017, respectively. There were no reclassifications to earnings of realized gains for the year ended December 31, 2016.
[2] | Net of a tax benefit of $11.2 million and tax expenses of $3.3 million and $0.3 million for the years ended December 31, 2018, 2017, and 2016, respectively.
[3] | The adoption of ASU 2018-02 on January 1, 2018 resulted in a reclassification of $3.1 million to retained earnings related to cash flow hedges and investment portfolio risk. The reclassification is reflected in the activity for the year ended December 31, 2018. See Note 2 for further details.

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