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Revenues from contracts with customers (Contract Assets and Liabilities) (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Capitalized Contract Cost [Line Items]
Contract assets	$ 48,949,000	$ 30,816,000
Deferred income, IRA fees	2,246,000	613,000
Commission
Capitalized Contract Cost [Line Items]
Contract assets	5,601,000	3,107,000
Mutual Fund Income
Capitalized Contract Cost [Line Items]
Contract assets	6,222,000	5,989,000
Advisory fees
Capitalized Contract Cost [Line Items]
Contract assets	2,873,000	1,590,000
Bank Deposit Sweep Income
Capitalized Contract Cost [Line Items]
Contract assets	670,000	687,000
Investment Banking Fees
Capitalized Contract Cost [Line Items]
Contract assets	29,398,000	16,119,000
Other Income [Member]
Capitalized Contract Cost [Line Items]
Contract assets	4,185,000	3,324,000
Investment Banking Fees
Capitalized Contract Cost [Line Items]
Deferred income, IRA fees	528,000	613,000
IRA fees (7)
Capitalized Contract Cost [Line Items]
Deferred income, IRA fees	$ 1,718,000	$ 0

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+ References

No definition available.

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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

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

+ References

Reference 1: 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 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044

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