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Bank Deposits (Schedule Of Deposits) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Deposits Liabilities Balance Sheet Reported Amounts [Abstract]    
Money market and savings accounts $ 15,465,695 $ 13,530,670
Demand deposits (interest-bearing) 926,377 1,113,296
Demand deposits (non-interest-bearing) 261,776 165,657
Certificates of deposit 227,085 522,958
Bank deposits $ 16,880,933 $ 15,332,581