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Financial Assets at Fair Value Through Other Comprehensive Income - Additional Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 TWD ($) Bonds | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($)
Financial assets at fair value through other comprehensive income [line items] |  |  |
Unsecured subordinate corporate bonds amount | $ 1,556,980 | $ 56,128 | $ 1,082,000
Unsecured subordinate corporate bonds [member] |  |  |
Financial assets at fair value through other comprehensive income [line items] |  |  |
Unsecured subordinate corporate bonds amount | $ | $ 1,000 |  |
Number of bonds acquired | Bonds | 1,000 |  |
Corporate bonds annual interest rate | 3.50% | 3.50% |
Effective interest rate | 3.20% | 3.20% |

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