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Revenues from contracts with customers (Contract Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Capitalized Contract Cost [Line Items]    
Contract assets (receivables) $ 27,993 $ 37,192
Deferred revenue (payables) 180 235
Commission    
Capitalized Contract Cost [Line Items]    
Contract assets (receivables) 7,562 2,886
Mutual Fund Income    
Capitalized Contract Cost [Line Items]    
Contract assets (receivables) 6,137 6,205
Advisory fees    
Capitalized Contract Cost [Line Items]    
Contract assets (receivables) 3,785 4,546
Bank Deposit Sweep Income    
Capitalized Contract Cost [Line Items]    
Contract assets (receivables) 1,188 595
Investment Banking Fees    
Capitalized Contract Cost [Line Items]    
Contract assets (receivables) 6,376 17,765
Other    
Capitalized Contract Cost [Line Items]    
Contract assets (receivables) 2,945 5,195
Investment Banking Fees    
Capitalized Contract Cost [Line Items]    
Deferred revenue (payables) $ 180 $ 235