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v3.22.1

Available-for-Sale and Held-to-Maturity Securities (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) Security | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($)
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |
Accrued interest receivable | $ 32,100 |  | $ 27,400,000
Transfers from available for sale securities to held to maturity |  | $ 312,900,000 |
Gain On Transfer Of securities |  | 0 |
Net realized gains (loss) resulting from sale of available-for-sale securities | 0 | $ 0 |
Financial instruments pledged as collateral | $ 569,700,000 |  | 639,600,000
Number of available for sale securities whose amortized costs exceeded their fair values | Security | 201 |  |
Available-for-sale Securities, Continuous | $ 101,046,000 |  |
Available-for-sale Securities, Continuous Unrealized | 15,957,000 |  |
Available-for-sale Securities, Continuous | $ 1,468,387,000 |  |
Percentage of available-for-sale portfolio | 76.20% |  |
Pledged [Member] |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |
Trading securities pledged | $ 1,200,000,000 |  | 1,200,000,000
Other Assets [Member] |  |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |  |  |
Accrued interest receivable | $ 28,300,000 |  | $ 29,100,000

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