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Revenues from contracts with customers (Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Capitalized Contract Cost [Line Items] |  |
Contract assets | $ 28,905 | $ 30,816
Deferred income, IRA fees | 887 | 613
Commission |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 2,941 | 3,107
Mutual Fund Income |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 6,253 | 5,989
Advisory fees |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 1,911 | 1,590
Bank Deposit Sweep Income |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 563 | 687
Investment Banking Fees |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 11,693 | 16,119
Other Income [Member] |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 5,544 | 3,324
Investment Banking Fees |  |
Capitalized Contract Cost [Line Items] |  |
Deferred income, IRA fees | 307 | 613
IRA fees (7) |  |
Capitalized Contract Cost [Line Items] |  |
Deferred income, IRA fees | $ 580 | $ 0

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130533-203044 + Details
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