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Bank Deposits (Schedule of Deposits) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deposits Liabilities Balance Sheet Reported Amounts [Abstract]    
Demand deposits (interest-bearing) $ 22,626,560 $ 16,886,953
Demand deposits (non-interest-bearing) 626,633 411,890
Certificates of deposit 27,155 97,654
Bank deposits $ 23,280,348 $ 17,396,497