Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 25,125	$ 36,066	$ 61,539	$ 79,741
Preferred stock dividends	(10)	(10)	(20)	(20)
Net income available to common equity	25,115	36,056	61,519	79,721
Dividends and undistributed earnings allocated to participating securities	(8)	(34)	(21)	(67)
Net income available to common shareholders	$ 25,107	$ 36,022	$ 61,498	$ 79,654
Basic weighted-average shares outstanding (shares)	39,167	38,830	39,131	38,826
Stock-based compensation awards (shares)	253	365	290	447
Diluted weighted-average shares outstanding (shares)	39,420	39,195	39,421	39,273
Antidilutive stock options (shares)	0	0	0	0
Earnings per share:
Basic (in dollars per share)	$ 0.64	$ 0.93	$ 1.57	$ 2.05
Diluted (in dollars per share)	$ 0.64	$ 0.92	$ 1.56	$ 2.03