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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) Security | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) Security | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |  |
Debt Securities Available For Sale Allowance For CreditLoss | $ 0 |  | $ 0 |  |
Accrued interest receivable | 97,800,000 |  | 97,800,000 |  | $ 94,000,000
Proceeds from sale of available-for-sale securities | 0 | $ 0 | 0 | $ 2,400,000 |
Net realized gains (loss) resulting from sale of available-for-sale securities |  |  |  | $ 7,600,000 |
Financial instruments pledged as collateral | $ 94,400,000 |  | $ 94,400,000 |  | 746,400,000
Number of available for sale securities whose amortized costs exceeded their fair values | Security | 270 |  | 270 |  |
Available-for-sale Securities, Continuous | $ 187,379,000 |  | $ 187,379,000 |  |
Available-for-sale Securities, Continuous Unrealized | 186,694,000 |  | 186,694,000 |  |
Available-for-sale Securities, Continuous | $ 1,505,820,000 |  | $ 1,505,820,000 |  |
Percentage of available-for-sale portfolio | 95.10% |  | 95.10% |  |
Pledged [Member] |  |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |  |
Trading securities pledged | $ 1,100,000,000 |  | $ 1,100,000,000 |  | 1,300,000,000
Other Assets [Member] |  |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |  |
Accrued interest receivable | $ 89,800,000 |  | $ 89,800,000 |  | $ 95,700,000

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