Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 18,823	$ 28,034	$ 80,362	$ 107,763
Preferred stock dividends	(10)	(10)	(30)	(30)
Net income available to common equity	18,813	28,024	80,332	107,733
Dividends and undistributed earnings allocated to participating securities	(3)	(12)	(25)	(79)
Net income available to common shareholders	$ 18,810	$ 28,012	$ 80,307	$ 107,654
Basic weighted-average shares outstanding (shares)	39,194	38,906	39,152	38,853
Stock-based compensation awards (shares)	236	354	272	416
Diluted weighted-average shares outstanding (shares)	39,430	39,260	39,424	39,269
Antidilutive stock options (shares)	0	0	0	0
Earnings per share:
Basic (in dollars per share)	$ 0.48	$ 0.72	$ 2.05	$ 2.77
Diluted (in dollars per share)	$ 0.48	$ 0.71	$ 2.04	$ 2.74