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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) Security | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |
Proceeds from sale of available-for-sale securities |  | $ 491,900,000 | $ 641,800,000
Net realized gains (loss) resulting from sale of available-for-sale securities | $ 0 | (500,000) | $ (300,000)
Accrued interest receivable | 27,400,000 | 20,800,000 |
Transfers from held to maturity to available for sale securities reclassification fair value | 312,900,000 | 1,000,000,000.0 |
Gain On Transfer Of securities | 0 | 0 |
Financial instruments pledged as collateral | $ 639,600,000 | 368,400,000 |
Number of available for sale securities whose amortized costs exceeded their fair values | Security | 89 |  |
Available-for-sale Securities, Continuous | $ 17,026,000 |  |
Available-for-sale Securities, Continuous | 1,061,879,000 |  |
Available-for-sale Securities, Continuous Unrealized | $ 3,479,000 |  |
Percentage of available-for-sale portfolio | 50.20% |  |
Pledged [Member] |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |
Trading securities pledged | $ 1,200,000,000 | 1,400,000,000 |
Other Assets [Member] |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |
Accrued interest receivable | $ 29,100,000 | $ 26,000,000.0 |

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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