Share-Based Payment Arrangements (Narrative) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Entity $ / shares shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized | $	$ 22.7	$ 24.7	$ 23.5
Recognized tax benefit related to share-based compensation | $	6.3	5.7	$ 7.0
Restricted and Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense | $	$ 44.4
Weighted-average period	3 years
Total fair value of shares vested | $	$ 24.0	$ 18.4
Shares granted	789,726
Grant date fair value per share | $ / shares	$ 42.38
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	47,734
Grant date fair value per share | $ / shares	$ 43.23
Vesting performance period	3 years
Number of peer group regional banks | Entity	50
Service period	3 years
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	47,734
Grant date fair value per share | $ / shares	$ 36.25
Vesting performance period	2 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	550,976
2020 Long Term Incentive Plan [Member] | Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate awards authorized for grant	3,900,000
Maximum number of shares which may be granted to participant	250,000
Shares available for future issuance	1,400,000
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