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Financial Assets at Fair Value Through Other Comprehensive Income - (FVTOCI) (Tables) | 12 Months Ended
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Dec. 31, 2019
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Summary of Financial Assets at Fair Value Through Other Comprehensive Income |
|  | December 31
|  | 2018 |  | 2019
|  | NT$ |  | NT$ |  | US$ (Note 4)
Investments in equity instruments at FVTOCI |  | $ | 580,399 |  |  | $ | 755,903 |  |  | $ | 25,272 |
Investments in debt instruments at FVTOCI |  |  | 1,016,924 |  |  |  | 1,014,872 |  |  |  | 33,931 |
|  | $ | 1,597,323 |  |  | $ | 1,770,775 |  |  | $ | 59,203 |
Summary of Investments in Equity Instruments at Fair Value Through Other Comprehensive Income |
| a. | Investments in equity instruments at FVTOCI
|  | December 31
|  | 2018 |  | 2019
|  | NT$ |  | NT$ |  | US$ (Note 4)
Unquoted ordinary shares |  | $ | 532,047 |  |  | $ | 565,028 |  |  | $ | 18,891 |
Unquoted preferred shares |  |  | 8,683 |  |  |  | 158,718 |  |  |  | 5,306 |
Limited partnership |  |  | 39,669 |  |  |  | 32,157 |  |  |  | 1,075 |
|  | $ | 580,399 |  |  | $ | 755,903 |  |  | $ | 25,272 |
Summary of Investments in Debt Instruments at Fair Value Through Other Comprehensive Income |
| b. | Investments in debt instruments at FVTOCI
|  | December 31
|  | 2018 |  | 2019
|  | NT$ |  | NT$ |  | US$ (Note 4)
Unsecured subordinate corporate bonds |  | $ | 1,016,924 |  |  | $ | 1,014,872 |  |  | $ | 33,931 |

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- Definition Disclosure of fair value of investments in debt instruments designated at fair value through other comprehensive income [text block] + References No definition available. + Details
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- Definition The disclosure of the fair value of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Investments in equity instruments designated at fair value through other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 11A -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_11A_c&doctype=Standard -URIDate 2019-03-27 + Details
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