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Bank Deposits (Tables)
 9 Months Ended
Sep. 30, 2021
Deposit Liabilities [Abstract]  
Deposits from Banking Clients Consisting of Interest Bearing and Noninterest Bearing Deposits
Bank deposits consist of interest-bearing and non-interest-bearing deposits as follows:
September 30, 2021December 31, 2020
Interest-bearing deposits:  
Deposits swept from brokerage accounts$367,219 $332,513 
Checking20,142 17,785 
Savings and other6,973 6,739 
Total interest-bearing deposits394,334 357,037 
Non-interest-bearing deposits941 985 
Total bank deposits$395,275 $358,022