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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
May 27, 2020
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issuer's Redemption Option, Period to Redeem After a Redemption Event 90 days    
Preferred Stock, Redemption Price Per Share $ 1,000    
Earnings Per Share [Line Items]      
Preferred stock, shares authorized   10,000,000  
Preferred stock dividends   $ 36.0 $ 36.0
Preferred stock dividends, cash   $ 36.0 $ 36.0
Preferred Stock, Dividends Per Share, Declared   $ 60.00 $ 60.00
Preferred Stock, Dividends, Per Share, Cash Paid   60.00 $ 60.00
Rating Agency Event [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Preferred Stock, Redemption Price Per Share 1,020    
Regulatory Capital Event [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Preferred Stock, Redemption Price Per Share $ 1,000    
Series A Preferred Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Preferred Stock, Dividend Rate, Reset Percentage 5.662%    
Preferred Stock, Reset Period 5 years    
Preferred Stock, Liquidation Preference Per Share $ 1,000    
Earnings Per Share [Line Items]      
Preferred Stock, No Par Value   $ 0  
Preferred stock, shares issued   600,000 600,000
Preferred stock, shares outstanding   600,000 600,000
Preferred Stock, Dividend Rate, Percentage 6.00%