Share-Based Payment Arrangements (Narrative) (Details)	6 Months Ended
Jun. 30, 2023 USD ($) Entity $ / shares shares
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, outstanding	1,476
Number of shares, exercisable	1,476
Weighted average exercise price \| $ / shares	$ 53.73
Aggregate intrinsic value \| $	$ 0
Stock options exercised	0
Restricted and Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense \| $	$ 59,100,000
Weighted-average period	3 years 2 months 12 days
Total fair value of shares vested \| $	$ 9,400,000
Shares granted	639,257
Grant date fair value per share \| $ / shares	$ 48.65
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	41,495
Grant date fair value per share \| $ / shares	$ 51.14
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] \| Operating Earnings Per Share [Member] \| Executive Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	41,495
Grant date fair value per share \| $ / shares	$ 46.73
Vesting performance period	2 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	490,749
Maximum [Member] \| Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining contractual term	1 year

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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