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Available-for-Sale and Held-to-Maturity Securities (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) Security | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |
Proceeds from sale of available-for-sale securities | $ 2,400,000 | $ 80,000,000 | $ 0
Net realized gains (loss) resulting from sale of available-for-sale securities | (7,600,000) | 100,000 |
Accrued interest receivable | 94,000,000 | 65,700,000 |
Financial instruments pledged as collateral | $ 746,400,000 | 796,200,000 |
Number of available for sale securities whose amortized costs exceeded their fair values | Security | 281 |  |
Available-for-sale Securities, Continuous | $ 175,950,000 |  |
Available-for-sale Securities, Continuous | 1,548,891,000 |  |
Available-for-sale Securities, Continuous Unrealized | $ 174,078,000 |  |
Percentage of available-for-sale portfolio | 99.80% |  |
Pledged [Member] |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |
Trading securities pledged | $ 1,300,000,000 | 1,300,000,000 |
Other Assets [Member] |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |
Accrued interest receivable | $ 95,700,000 | $ 82,300,000 |

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + Details
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