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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Aug. 01, 2019 USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |
Proceeds from sale of available-for-sale securities | $ 641,800 | $ 372,400 | $ 87,300 |
Net realized gains (loss) resulting from sale of available-for-sale securities | (300) | (3,900) | 400 |
Transfers from held to maturity to available for sale securities reclassification fair value |  |  |  | $ 1,100,000
Other comprehensive income (loss), transfers from held-to-maturity to available-for-sale securities, net of tax | 17,900 |  |  |
Unrealized gains (losses) recorded in accumulated other comprehensive loss | 42,400 | (36,300) | 4,700 |
Financial instruments pledged as collateral | $ 801,500 | 1,900,000 |  |
Number of available for sale securities whose amortized costs exceeded their fair values | security | 125 |  |  |
Available-for-sale Securities, Continuous | $ 14,793 |  |  |
Available-for-sale Securities, Continuous Unrealized | 6,472 |  |  |
Available-for-sale Securities, Continuous | $ 1,624,169 |  |  |
Percentage of available-for-sale portfolio | 49.90% |  |  |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 125 |  |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 34,300 |  |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 31,400 |  |  |
Credit-related OTTI | 0 | 0 | $ 0 |
Gross unrealized losses related to investment portfolio | 49,100 |  |  |
Pledged [Member] |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |
Trading securities pledged | $ 816,100 | $ 1,600,000 |  |

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