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Revenues from contracts with customers (Contract Assets and Liabilities) (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Capitalized Contract Cost [Line Items] |  |
Contract assets | $ 30,857,000 | $ 28,888,000
Deferred income, IRA fees | 1,295,000 | 408,000
Commission |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 780,000 | 2,824,000
Mutual Fund Income |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 5,866,000 | 6,746,000
Advisory fees |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 1,431,000 | 1,594,000
Bank Deposit Sweep Income |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 697,000 | 3,454,000
Investment Banking Fees |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 15,983,000 | 9,284,000
Other Income [Member] |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 6,100,000 | 4,986,000
Investment Banking Fees |  |
Capitalized Contract Cost [Line Items] |  |
Deferred income, IRA fees | 659,000 | 408,000
IRA fees (7) |  |
Capitalized Contract Cost [Line Items] |  |
Deferred income, IRA fees | $ 636,000 | $ 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=121604090&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=121556615&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=121556615&loc=SL49130533-203044 + Details
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