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Revenues from contracts with customers Revenues from contracts with customers (Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jan. 01, 2018
Capitalized Contract Cost [Line Items]
Contract Revenue Cost	$ 1,600
Contract assets	22,335	$ 18,631
Deferred income, IRA fees	1,965	0
Commission
Capitalized Contract Cost [Line Items]
Contract assets	3,059	2,007
Mutual Fund Income
Capitalized Contract Cost [Line Items]
Contract assets	7,308	7,779
Advisory fees
Capitalized Contract Cost [Line Items]
Contract assets	750	1,460
Bank Deposit Sweep Income
Capitalized Contract Cost [Line Items]
Contract assets	3,874	3,459
Investment Banking Fees
Capitalized Contract Cost [Line Items]
Contract assets	4,683	3,926
Other Income [Member]
Capitalized Contract Cost [Line Items]
Contract assets	2,661	0
Investment Banking Fees
Capitalized Contract Cost [Line Items]
Deferred income, IRA fees	450	0
IRA Fees [Member]
Capitalized Contract Cost [Line Items]
Deferred income, IRA fees	$ 1,515	$ 0

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No definition available.

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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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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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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