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The highest quantity of shares an employee can purchase under the plan per period.

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Percentage of vesting of award under share-based payment arrangement.

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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