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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) security | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) security | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Aug. 01, 2019 USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |  |  |  |
Accrued interest receivable | $ 18,600 |  | $ 18,600 |  |  |  |
Proceeds from sale of available-for-sale securities | 0 | $ 486,500 | 491,900 | $ 641,800 |  |  |
Net realized gains (loss) resulting from sale of available-for-sale securities |  |  | (500) | (300) |  |  |
Transfers from available for sale securities to held to maturity |  |  |  |  | $ 313,000 |  |
Transfers from held to maturity to available for sale securities reclassification fair value |  |  |  |  |  |  | $ 1,100,000
Transfer from held-to-maturity securities to available-for-sale, net of tax |  | 17,900 |  | 17,900 |  |  |
Unrealized gains (losses) recorded in accumulated other comprehensive loss | 19,100 | $ (1,600) | 22,500 | $ 40,500 |  |  |
Financial instruments pledged as collateral | $ 188,400 |  | $ 188,400 |  |  | $ 801,500 |
Number of available for sale securities whose amortized costs exceeded their fair values | security | 91 |  | 91 |  |  |  |
Available-for-sale Securities, Continuous | $ 17,956 |  | $ 17,956 |  |  |  |
Available-for-sale Securities, Continuous Unrealized | 9,779 |  | 9,779 |  |  |  |
Available-for-sale Securities, Continuous | $ 1,322,175 |  | $ 1,322,175 |  |  |  |
Percentage of available-for-sale portfolio | 46.80% |  | 46.80% |  |  |  |
Pledged [Member] |  |  |  |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |  |  |  |
Trading securities pledged | $ 1,500,000 |  | $ 1,500,000 |  |  | $ 816,100 |
Other Assets [Member] |  |  |  |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |  |  |  |
Accrued interest receivable | $ 25,100 |  | $ 25,100 |  |  |  |

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