Noninterest Income - Gains on Equity Warrant Assets, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Gains and Losses on Derivatives [Abstract]
Gains on exercises, net	$ 58,186	$ 48,275	$ 31,197
Terminations	(5,964)	(4,422)	(3,015)
Changes in fair value, net	36,920	10,702	9,710
Gains on equity warrant assets, net	$ 89,142	$ 54,555	$ 37,892	[1]

[1] Our consolidated statements of income for the year ended December 31, 2016 was modified from prior periods’ presentation to conform to the current period's presentation, which reflects a new line item to separately disclose net gains on equity warrant assets. In prior periods, net gains on equity warrant assets were reported as a component of net gains on derivative instruments. We removed the line item "gains on derivative instruments, net" and reclassified all other gains on derivative instruments, net to other noninterest income.