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Revenues from contracts with customers (Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Jan. 01, 2018
Capitalized Contract Cost [Line Items] |  |
Contract assets | $ 23,652 | $ 18,631
Deferred income, IRA fees | 1,169 | 0
Cost of Goods and Services Sold | 1,500 |
Commission |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 2,867 | 2,007
Mutual Fund Income |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 7,364 | 7,779
Advisory fees |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 681 | 1,460
Bank Deposit Sweep Income |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 3,849 | 3,459
Investment Banking Fees |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 5,601 | 3,926
Other Income [Member] |  |
Capitalized Contract Cost [Line Items] |  |
Contract assets | 3,290 | 0
Investment Banking Fees |  |
Capitalized Contract Cost [Line Items] |  |
Deferred income, IRA fees | 407 | 0
IRA fees |  |
Capitalized Contract Cost [Line Items] |  |
Deferred income, IRA fees | $ 762 | $ 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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