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Bank Deposits (Schedule Of Deposits) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Deposits Liabilities Balance Sheet Reported Amounts [Abstract]    
Money market and savings accounts $ 9,804,434 $ 6,429,780
Demand deposits (interest-bearing) 69,068 185,275
Certificates of deposit 4,963 15,087
Demand deposits (non-interest-bearing) 6,976 8,214
Bank deposits $ 9,885,441 $ 6,638,356
Weighted average interest rate on deposits 0.19% 0.17%