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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2025
Earnings Per Share [Abstract] |
Computation of Earnings Per Common Share | A summary of the information used in the computation of earnings per common share follows.
| Years Ended December 31, |
($ in thousands, except per share data) | 2025 |  | 2024 |  | 2023 |
Numerator: |  |  |  |  |  |
Net income to common shareholders | $ | 486,073 |  | $ | 460,815 |  | $ | 392,602 |
Net income or dividends allocated to participating securities - basic and diluted |  | 2,042 |  |  | 3,027 |  |  | 4,014 |
Net income allocated to common shareholders - basic and diluted | $ | 484,031 |  | $ | 457,788 |  | $ | 388,588 |
Denominator: |  |  |  |  |  |
Weighted-average common shares - basic |  | 84,905 |  |  | 86,346 |  |  | 86,130 |
Dilutive potential common shares |  | 535 |  |  | 302 |  |  | 293 |
Weighted-average common shares - diluted |  | 85,440 |  |  | 86,648 |  |  | 86,423 |
Earnings per common share: |  |  |  |  |  |
Basic | $ | 5.70 |  | $ | 5.30 |  | $ | 4.51 |
Diluted | $ | 5.67 |  | $ | 5.28 |  | $ | 4.50 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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