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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2020
Text block [abstract] |
Income and Share Data Used in Basic and Diluted EPS Computations |
|  | Year ended December 31, 2018 |
|  | Amount after income tax |  |  | Weighted average number of ordinary shares outstanding |  |  | Earnings per share |
Basic earnings per share |  | NT$000 |  |  | In thousands |  |  | NT$ |
Profit attributable to equity holders of the Company |  |  | 1,325,824 |  |  |  | 802,725 |  |  |  | 1.65 |
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |
Assumed conversion of all dilutive potential ordinary shares: |  |  |  |  |  |  |  |  |  |  |  |
Employees’ compensation |  |  |  |  |  |  | 7,626 |  |  |  |  |
Restricted shares |  |  |  |  |  |  | 3,356 |  |  |  |  |
Profit attributable to equity holders of the Company |  |  | 1,325,824 |  |  |  | 813,707 |  |  |  | 1.63 |
|  | Year ended December 31, 2019 |
|  | Amount after income tax |  |  | Weighted average number of ordinary shares outstanding |  |  | Earnings per share |
Basic earnings per share |  | NT$000 |  |  | In thousands |  |  | NT$ |
Profit attributable to equity holders of the Company |  |  | 2,508,574 |  |  |  | 727,111 |  |  |  | 3.45 |
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |
Assumed conversion of all dilutive potential ordinary shares: |  |  |  |  |  |  |  |  |  |  |  |
Employees’ compensation |  |  |  |  |  |  | 9,879 |  |  |  |  |
Restricted shares |  |  |  |  |  |  | 126 |  |  |  |  |
Profit attributable to equity holders of the Company |  |  | 2,508,574 |  |  |  | 737,116 |  |  |  | 3.40 |
|  | Year ended December 31, 2020 |
|  | Amount after income tax |  |  | Weighted average number of ordinary shares outstanding |  |  | Earnings per share |
Basic earnings per share |  | NT$000 |  |  | In thousands |  |  | NT$ |
Profit attributable to equity holders of the Company |  |  | 2,378,978 |  |  |  | 727,240 |  |  |  | 3.27 |
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |
Assumed conversion of all dilutive potential ordinary shares: |  |  |  |  |  |  |  |  |  |  |  |
Employees’ compensation |  |  |  |  |  |  | 9,668 |  |  |  |  |
Profit attributable to equity holders of the Company |  |  | 2,378,978 |  |  |  | 736,908 |  |  |  | 3.23 |

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