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Financial Assets at Fair Value Through Other Comprehensive Income - Summary of Investments in Debt Instruments at Fair Value Through Other Comprehensive Income (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Financial assets at fair value through other comprehensive income [line items]      
Investments in debt instruments at FVTOCI $ 1,012,736 $ 36,066 $ 1,014,872
Unsecured subordinate corporate bonds [member]      
Financial assets at fair value through other comprehensive income [line items]      
Investments in debt instruments at FVTOCI $ 1,012,736 $ 36,066 $ 1,014,872