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Available-For-Sale And Held-To-Maturity Securities (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) | Jun. 30, 2022 USD ($) Security | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |
Accrued interest receivable |  | $ 39,100 |  | $ 27,400
Net realized gains (loss) resulting from sale of available-for-sale securities |  | 0 | $ 0 |
Transfers from available for sale securities to held to maturity | $ 312,900 |  |  |
Gain On Transfer Of securities | $ 0 |  |  |
Financial instruments pledged as collateral |  | $ 749,000 |  | 639,600
Number of available for sale securities whose amortized costs exceeded their fair values | Security |  | 287 |  |
Available-for-sale Securities, Continuous |  | $ 176,597 |  |
Available-for-sale Securities, Continuous Unrealized |  | 23,824 |  |
Available-for-sale Securities, Continuous |  | $ 1,760,568 |  |
Percentage of available-for-sale portfolio |  | 93.70% |  |
Pledged [Member] |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |
Trading securities pledged |  | $ 1,200,000 |  | 1,200,000
Other Assets [Member] |  |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |  |
Accrued interest receivable |  | $ 39,500 |  | $ 29,100

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