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Financial Instruments with Off-Balance Sheet Risk (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Financial Instruments With Off-balance-sheet Risk And Concentrations Of Credit Risk |  |
Margin loans extended | $ 500.0 | $ 600.0
Receivables from customers | $ 76.2 | $ 84.2

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Margin loans extended. + References No definition available. + Details
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Balance Type: | credit
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- Definition Amount due from customers for fees and charges arising from transactions related to the entity's brokerage activities and operations. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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