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Regulatory Requirements and Subsidiary Dividend Restrictions - Customer Reserve Requirements (Details) - USD ($) | Oct. 04, 2021 | Sep. 30, 2021
--- | --- | ---
Capital and Other Regulatory Requirements [Line Items] |  |
Cash reserve deposit required |  | $ 7,400,000
Customer SRBA |  |
Capital and Other Regulatory Requirements [Line Items] |  |
Cash reserve deposit required |  | 1,000
PAB |  |
Capital and Other Regulatory Requirements [Line Items] |  |
Cash reserve deposit required |  | 10,500,000
PAB Reserve Requirement |  |
Capital and Other Regulatory Requirements [Line Items] |  |
Cash reserve deposit required |  | 3,100,000
PAB SRBA |  |
Capital and Other Regulatory Requirements [Line Items] |  |
Cash reserve deposit required |  | $ 1,000
PAB SRBA | Subsequent Event |  |
Capital and Other Regulatory Requirements [Line Items] |  |
Cash reserve deposit required and made | $ 8,900,000 |

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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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