Net Income Per Common Share - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic
Net income applicable to common stock	$ 175,892	$ 83,651	$ 167,596
Average common shares outstanding (shares)	56,114,666	56,270,566	58,046,716
Net income per common share - basic (usd per share)	$ 3.13	$ 1.49	$ 2.89
Diluted
Net income applicable to common stock	$ 175,892	$ 83,651	$ 167,596
Average common shares outstanding (shares)	56,114,666	56,270,566	58,046,716
Effect of dilutive stock-based compensation (shares)	309,818	197,599	179,970
Average common shares outstanding - diluted (shares)	56,424,484	56,468,165	58,226,686
Net income per common share - diluted (usd per share)	$ 3.12	$ 1.48	$ 2.88