Acquisitions - Pro Forma Financial Information (Details) - Opus Bank - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Business Acquisition [Line Items]
Net interest and other income	$ 203,240	$ 375,984
Net loss	$ (62,479)	$ (119,931)
Basic loss per share (in dollars per share)	$ (0.67)	$ (1.29)
Diluted loss per share (in dollars per share)	$ (0.67)	$ (1.29)