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Basis of presentation and significant accounting policies and practices (Tables) | 9 Months Ended
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Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Earnings Per Share | Computation and reconciliation of earnings per common share are as follows:
| For Three Months Ended September 30,
| 2025 |  | 2024
| Net Income |  | Shares |  | EPS |  | Net Income |  | Shares |  | EPS
Basic EPS: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 1,364 |  |  |  |  |  |  | $ | 1,362 |  |  |  |  |
Income allocated to RSUs | (8) |  |  |  |  |  |  | (7) |  |  |  |  |
Income allocated to common stock | $ | 1,356 |  |  | 909 |  |  | $ | 1.49 |  |  | $ | 1,355 |  |  | 913 |  |  | $ | 1.48 |
Dilutive effect of stock compensation plans |  |  | 5 |  |  |  |  |  |  | 7 |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 1,364 |  |  |  |  |  |  | $ | 1,362 |  |  |  |  |
Income allocated to RSUs | (8) |  |  |  |  |  |  | (7) |  |  |  |  |
Income allocated to common stock | $ | 1,356 |  |  | 914 |  |  | $ | 1.48 |  |  | $ | 1,355 |  |  | 920 |  |  | $ | 1.47 |
| For Nine Months Ended September 30,
| 2025 |  | 2024
| Net Income |  | Shares |  | EPS |  | Net Income |  | Shares |  | EPS
Basic EPS: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 3,838 |  |  |  |  |  |  | $ | 3,594 |  |  |  |  |
Income allocated to RSUs | (21) |  |  |  |  |  |  | (18) |  |  |  |  |
Income allocated to common stock | $ | 3,817 |  |  | 909 |  |  | $ | 4.20 |  |  | $ | 3,576 |  |  | 912 |  |  | $ | 3.92 |
Dilutive effect of stock compensation plans |  |  | 5 |  |  |  |  |  |  | 7 |  |  |
Diluted EPS: |  |  |  |  |  |  |  |  |  |  |
Net income | $ | 3,838 |  |  |  |  |  |  | $ | 3,594 |  |  |  |  |
Income allocated to RSUs | (21) |  |  |  |  |  |  | (18) |  |  |  |  |
Income allocated to common stock | $ | 3,817 |  |  | 914 |  |  | $ | 4.18 |  |  | $ | 3,576 |  |  | 919 |  |  | $ | 3.89 |

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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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