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Bank Deposits (Tables)
 6 Months Ended
Jun. 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:
June 30, 2021December 31, 2020
Interest-bearing deposits:  
Deposits swept from brokerage accounts$341,432 $332,513 
Checking19,353 17,785 
Savings and other7,016 6,739 
Total interest-bearing deposits367,801 357,037 
Non-interest-bearing deposits837 985 
Total bank deposits$368,638 $358,022