Noninterest Income Gains and Losses on Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Gains and Losses on Derivatives [Abstract]
Gains and Losses on Exercised Warrant Assets	$ 9,927	$ 7,956
Losses on Terminated Equity Warrant Assets	(922)	(634)
Unrealized Gain (Loss) on Derivatives	10,186	(632)
Gains on equity warrant assets, net	$ 19,191	$ 6,690