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Bank Deposits (Tables)
 12 Months Ended
Dec. 31, 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:
December 31,20202019
Interest-bearing deposits:  
Deposits swept from brokerage accounts$332,513 $201,531 
Checking17,785 12,650 
Savings and other6,739 5,168 
Total interest-bearing deposits357,037 219,349 
Non-interest-bearing deposits985 745 
Total bank deposits$358,022 $220,094