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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%