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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) security | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) security | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |  |
Accrued interest receivable | $ 19,900 |  | $ 19,900 |  |
Proceeds from sale of available-for-sale securities | 203,600 | $ 155,300 | 491,900 | $ 155,300 |
Net realized gains (loss) resulting from sale of available-for-sale securities | 200 | (300) | (500) | (300) |
Unrealized gains (losses) recorded in accumulated other comprehensive loss | 76,600 | $ 16,300 | 3,300 | $ 42,100 |
Financial instruments pledged as collateral | $ 249,500 |  | $ 249,500 |  | $ 801,500
Number of available for sale securities whose amortized costs exceeded their fair values | security | 110 |  | 110 |  |
Available-for-sale Securities, Continuous | $ 38,407 |  | $ 38,407 |  |
Available-for-sale Securities, Continuous Unrealized | 16,156 |  | 16,156 |  |
Available-for-sale Securities, Continuous | $ 1,616,922 |  | $ 1,616,922 |  |
Percentage of available-for-sale portfolio | 51.00% |  | 51.00% |  |
Pledged [Member] |  |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |  |
Trading securities pledged | $ 1,100,000 |  | $ 1,100,000 |  | $ 816,100
Other Assets [Member] |  |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |  |
Accrued interest receivable | $ 32,900 |  | $ 32,900 |  |

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