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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2025
Accounting Policies [Abstract] |
Reconciliation of Numerator and Denominator of Basic Earnings Per Share with that of Diluted Earnings Per Share | The reconciliation of the numerator and denominator of basic earnings per share with that of diluted earnings per share is presented as follows:
|  | Year Ended December 31 |
(Dollars in thousands, except per share) |  | 2025 |  |  | 2024 |  |  | 2023 |
Distributed earnings allocated to common stock |  | $ | 211,141 |  |  | $ | 200,156 |  |  | $ | 195,167 |
Undistributed earnings allocated to common stock |  |  | 252,428 |  |  |  | 172,006 |  |  |  | 170,267 |
Net earnings allocated to common shareholders |  | $ | 463,569 |  |  | $ | 372,162 |  |  | $ | 365,434 |
Average common shares outstanding |  |  | 141,497,205 |  |  |  | 134,947,592 |  |  |  | 134,505,058 |
Dilutive effect of stock compensation |  |  | 330,155 |  |  |  | 277,825 |  |  |  | 248,762 |
Average diluted shares outstanding |  |  | 141,827,360 |  |  |  | 135,225,417 |  |  |  | 134,753,820 |
Earnings per basic common share |  | $ | 3.28 |  |  | $ | 2.76 |  |  | $ | 2.72 |
Earnings per diluted common share |  | $ | 3.27 |  |  | $ | 2.75 |  |  | $ | 2.71 |

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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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