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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 39,806	$ 33,179	$ 63,038	$ 65,550
Preferred stock dividends	(10)	(10)	(20)	(20)
Net income available to common equity	39,796	33,169	63,018	65,530
Dividends and undistributed earnings allocated to participating securities	(49)	(31)	(71)	(63)
Net income available to common shareholders	$ 39,747	$ 33,138	$ 62,947	$ 65,467
Basic weighted-average shares outstanding (shares)	38,663	38,327	38,602	38,272
Stock options and other stock compensation (shares)	497	576	522	569
Diluted weighted-average shares outstanding (shares)	39,160	38,903	39,124	38,841
Antidilutive stock options (shares)	0	0	0	0
Earnings per share:
Basic (in dollars per share)	$ 1.03	$ 0.86	$ 1.63	$ 1.71
Diluted (in dollars per share)	$ 1.01	$ 0.85	$ 1.61	$ 1.69

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Earnings Per Share, Continuing Operations [Abstract]

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