Acquisition - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Business Combinations [Abstract]
Total revenue (net interest income plus other income)	$ 474,891	$ 476,878
Net income available to common shareholders	$ 161,228	$ 177,906
Earnings per share:
Basic (in dollars per share)	$ 2.89	$ 3.19
Diluted (in dollars per share)	$ 2.88	$ 3.18