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Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2024
Earnings Per Share [Abstract]  
Calculations for basic and diluted earnings per common share Presented below are the calculations for basic and diluted earnings per common share:
 Three Months Ended Mar 31,
 ($ in thousands, except per share data)20242023
Net income$81,169 $103,360 
Preferred stock dividends(2,875)(2,875)
Net income available to common equity$78,294 $100,485 
Common shareholder dividends(33,407)(31,808)
Unvested share-based payment awards(120)(205)
Undistributed earnings$44,767 $68,472 
Undistributed earnings allocated to common shareholders$44,524 $68,086 
Undistributed earnings allocated to unvested share-based payment awards242 386 
Undistributed earnings$44,767 $68,472 
Basic
Distributed earnings to common shareholders$33,407 $31,808 
Undistributed earnings allocated to common shareholders44,524 68,086 
Total common shareholders earnings, basic$77,932 $99,894 
Diluted
Distributed earnings to common shareholders$33,407 $31,808 
Undistributed earnings allocated to common shareholders44,524 68,086 
Total common shareholders earnings, diluted$77,932 $99,894 
Weighted average common shares outstanding149,855 149,763 
Effect of dilutive common stock awards1,436 1,365 
Diluted weighted average common shares outstanding151,292 151,128 
Basic earnings per common share$0.52 $0.67 
Diluted earnings per common share$0.52 $0.66