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Equity Investment Securities - Change in Fair Value of Equity Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]        
Net change in fair value recorded during the period on equity investments with readily determinable fair value $ 313   $ 1,225 $ 3,518
Net change in fair value recorded on equity investments sold during the period 0   0 0
Net change in fair value on equity investments with readily determinable fair values $ 313 $ (1) $ 1,225 $ 3,518