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Revenues from contracts with customers Revenues from contracts with customers (Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Jan. 01, 2018
Capitalized Contract Cost [Line Items]
Contract Revenue Cost	$ 1,700
Contract assets	24,608	$ 18,631
Deferred income, IRA fees	2,220	0
Commission
Capitalized Contract Cost [Line Items]
Contract assets	3,152	2,007
Mutual Fund Income
Capitalized Contract Cost [Line Items]
Contract assets	7,823	7,779
Advisory fees
Capitalized Contract Cost [Line Items]
Contract assets	821	1,460
Bank Deposit Sweep Income
Capitalized Contract Cost [Line Items]
Contract assets	4,477	3,459
Investment Banking Fees
Capitalized Contract Cost [Line Items]
Contract assets	$ 8,335	$ 3,926

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+ References

No definition available.

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- Definition

Costs incurred and are directly related to generating contract revenues.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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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/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306

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-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Topic 606
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-Section 50
-Paragraph 8
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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