Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 366,122	$ 350,994	$ 306,771
Preferred stock dividends	(11,500)	(17,111)	(18,358)
Net income available to common equity	354,622	333,883	288,413
Common shareholder dividends	(122,417)	(115,212)	(111,291)
Unvested share-based payment awards	(720)	(849)	(732)
Undistributed earnings	231,485	217,822	176,390
Undistributed earnings allocated to common shareholders	229,995	216,299	175,134
Undistributed earnings allocated to unvested share-based payment awards	1,490	1,523	1,256
Undistributed earnings	231,485	217,822	176,390
Basic
Distributed earnings to common shareholders	122,417	115,212	111,291
Undistributed earnings allocated to common shareholders	229,995	216,299	175,134
Total common shareholders earnings, basic	352,412	331,510	286,425
Diluted
Distributed earnings to common shareholders	122,417	115,212	111,291
Undistributed earnings allocated to common shareholders	229,995	216,299	175,134
Total common shareholders earnings, diluted	$ 352,412	$ 331,510	$ 286,425
Weighted average common shares outstanding	149,162	150,773	153,005
Effect of dilutive common stock awards	1,334	1,214	637
Diluted weighted average common shares outstanding	150,496	151,987	153,642
Basic earnings per common share	$ 2.36	$ 2.20	$ 1.87
Diluted earnings per common share	$ 2.34	$ 2.18	$ 1.86