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Federal Reserve Requirements (Narrative) (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Federal Reserve Requirements [Abstract] |
Average amount of cash reserves required | $ 6.9

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- Definition Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116631393&loc=SL116631396-227033 + Details
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Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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