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Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 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 Sep 30,Nine Months Ended Sep 30,
 ($ in thousands, except per share data)2024202320242023
Net income$88,018 $83,248 $284,760 $273,762 
Preferred stock dividends(2,875)(2,875)(8,625)(8,625)
Net income available to common equity85,143 80,373 276,135 265,137 
Common shareholder dividends(33,413)(31,806)(100,131)(95,417)
Unvested share-based payment awards(185)(190)(502)(588)
Undistributed earnings$51,544 $48,377 $175,502 $169,132 
Undistributed earnings allocated to common shareholders$51,255 $48,090 $174,511 $168,136 
Undistributed earnings allocated to unvested share-based payment awards289 287 991 996 
Undistributed earnings$51,544 $48,377 $175,502 $169,132 
Basic 
Distributed earnings to common shareholders$33,413 $31,806 $100,131 $95,417 
Undistributed earnings allocated to common shareholders51,255 48,090 174,511 168,136 
Total common shareholders earnings, basic$84,669 $79,896 $274,642 $263,553 
Diluted
Distributed earnings to common shareholders$33,413 $31,806 $100,131 $95,417 
Undistributed earnings allocated to common shareholders51,255 48,090 174,511 168,136 
Total common shareholders earnings, diluted$84,669 $79,896 $274,642 $263,553 
Weighted average common shares outstanding150,247 150,035 149,993 149,929 
Effect of dilutive common stock awards1,244 980 1,251 1,042 
Diluted weighted average common shares outstanding151,492 151,014 151,244 150,971 
Basic earnings per common share$0.56 $0.53 $1.83 $1.76 
Diluted earnings per common share$0.56 $0.53 $1.82 $1.75