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Bank Deposits (Tables)
 9 Months Ended
Sep. 30, 2020
Banking and Thrift [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, 2020December 31, 2019
Interest-bearing deposits:  
Deposits swept from brokerage accounts$298,344 $201,531 
Checking15,508 12,650 
Savings and other6,131 5,168 
Total interest-bearing deposits319,983 219,349 
Non-interest-bearing deposits734 745 
Total bank deposits$320,717 $220,094