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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 42,239	$ 33,717	$ 105,278	$ 99,267
Preferred stock dividends	(10)	(10)	(30)	(30)
Net income available to common equity	42,229	33,707	105,248	99,237
Dividends and undistributed earnings allocated to participating securities	(88)	(32)	(159)	(94)
Net income available to common shareholders	$ 42,141	$ 33,675	$ 105,089	$ 99,143
Basic weighted-average shares outstanding (shares)	38,649	38,417	38,617	38,328
Stock options and other stock compensation (shares)	495	619	513	586
Diluted weighted-average shares outstanding (shares)	39,144	39,036	39,130	38,914
Antidilutive stock options (shares)	0	0	0	0
Earnings per share:
Basic (in dollars per share)	$ 1.09	$ 0.88	$ 2.72	$ 2.59
Diluted (in dollars per share)	$ 1.08	$ 0.86	$ 2.69	$ 2.55

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Earnings Per Share, Continuing Operations [Abstract]

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