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Share-Based Payment Arrangements (Narrative) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2025
USD ($)
Entity
$ / shares
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense recognized | $ $ 24.4 $ 22.7 $ 24.7
Recognized tax benefit related to share-based compensation | $ 6.7 6.3 $ 5.7
Restricted and Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation expense | $ $ 47.8    
Weighted-average period 2 years 10 months 24 days    
Total fair value of shares vested | $ $ 21.5 $ 24.0  
Shares granted 561,240    
Grant date fair value per share | $ / shares $ 56.14    
Performance Shares [Member] | Executive Management [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Service period 3 years    
Performance Shares [Member] | Total Shareholder Return [Member] | Executive Management [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted 445,989    
Vesting performance period 3 years    
Number of peer group regional banks | Entity 49    
Performance Shares [Member] | Total Shareholder Return [Member] | Executive Management [Member] | Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of maximum number of shares vested 200.00%    
Performance Shares [Member] | Adjusted Earnings Per Share [Member] | Executive Management [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted 66.84    
Performance Shares [Member] | Average Earnings Per Share [Member] | Executive Management [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted 26,198    
Performance Shares [Member] | Average tangible common equity Earnings Per Share [Member] | Executive Management [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted 26,198    
Grant date fair value per share | $ / shares $ 52.02    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted 26,989    
2020 Long Term Incentive Plan [Member] | Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate awards authorized for grant 5,200,000    
Maximum number of shares which may be granted to participant 250,000    
Shares available for future issuance 2,200,000    
2020 Long Term Incentive Plan [Member] | Options [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate awards authorized for grant 1,000,000