Acquisitions - Pro Forma Information (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) $ / shares
Business Combinations [Abstract]
Net interest and other income | $	$ 363,538
Net income | $	$ 120,400
Basic earnings per share (in dollars per share) | $ / shares	$ 1.95
Diluted earnings per share (in dollars per share) | $ / shares	$ 1.93