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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2024
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Presented below are the calculations for basic and diluted earnings per common share:
 For the Years Ended December 31,
 ($ in thousands, except per share data)202420232022
Net income$123,145 $182,956 $366,122 
Preferred stock dividends(11,500)(11,500)(11,500)
Net income available to common equity$111,645 $171,456 $354,622 
Common shareholder dividends$(138,508)$(128,748)$(122,417)
Unvested share-based payment awards(689)(785)(720)
Undistributed earnings$(27,552)$41,922 $231,485 
Undistributed earnings allocated to common shareholders$(27,552)$41,675 $229,995 
Undistributed earnings allocated to unvested share-based payment awards— 247 1,490 
Undistributed earnings$(27,552)$41,922 $231,485 
Basic
Distributed earnings to common shareholders$138,508 $128,748 $122,417 
Undistributed earnings allocated to common shareholders(27,552)41,675 229,995 
Total common shareholders earnings, basic$110,956 $170,424 $352,412 
Diluted
Distributed earnings to common shareholders$138,508 $128,748 $122,417 
Undistributed earnings allocated to common shareholders(27,552)41,675 229,995 
Total common shareholders earnings, diluted$110,956 $170,424 $352,412 
Weighted average common shares outstanding151,933 149,968 149,162 
Effect of dilutive common stock awards1,415 892 1,334 
Diluted weighted average common shares outstanding153,347 150,860 150,496 
Basic earnings per common share$0.73 $1.14 $2.36 
Diluted earnings per common share$0.72 $1.13 $2.34