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Effects on Initial application of IFRS 9 - Summary of Carrying Amount of Financial Assets Transferred (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Jan. 01, 2018
TWD ($)
Disclosure of financial assets [Line Items]        
Measured at fair value through profit or loss $ 63,488   $ 11,038  
Measured at fair value through other comprehensive income 262,007   121,808  
Measured at amortized cost 254,801   237,420  
Financial assets 10,131,324   9,642,833  
Retained earnings $ 5,401,569 $ 192,364 $ 4,651,215  
Fair value adjustment        
Disclosure of financial assets [Line Items]        
Measured at fair value through profit or loss       $ 493
Measured at fair value through other comprehensive income       50,801
Financial assets       51,294
Impairment loss adjustment [member]        
Disclosure of financial assets [Line Items]        
Measured at fair value through other comprehensive income       28,584
Financial assets       28,584
IAS 39 [member]        
Disclosure of financial assets [Line Items]        
Measured at cost       20,890
Other financial assets       70,241
Financial assets       91,131
IFRS 9 [member]        
Disclosure of financial assets [Line Items]        
Measured at fair value through profit or loss       11,433
Measured at fair value through other comprehensive income       89,335
Measured at amortized cost       70,241
Financial assets       171,009
Transferred into and measured at fair value through profit or loss [member]        
Disclosure of financial assets [Line Items]        
Measured at cost       (10,940)
Measured at fair value through profit or loss       10,940
Transferred into and measured at fair value through other comprehensive income [member]        
Disclosure of financial assets [Line Items]        
Measured at cost       (9,950)
Measured at fair value through other comprehensive income       9,950
Transfer into and measured at amortized cost [member]        
Disclosure of financial assets [Line Items]        
Other financial assets       (70,241)
Measured at amortized cost       70,241
Increase (decrease) due to changes in accounting policy required by IFRSs [member]        
Disclosure of financial assets [Line Items]        
Retained earnings       (1,940)
Increase (decrease) due to changes in accounting policy required by IFRSs [member] | Fair value adjustment        
Disclosure of financial assets [Line Items]        
Retained earnings       493
Other equity interest       79,385
Increase (decrease) due to changes in accounting policy required by IFRSs [member] | Impairment loss adjustment [member]        
Disclosure of financial assets [Line Items]        
Retained earnings       28,584
Other equity interest       (28,584)
Increase (decrease) due to changes in accounting policy required by IFRSs [member] | Income tax adjustment [member]        
Disclosure of financial assets [Line Items]        
Other equity interest       (8,636)
Increase (decrease) due to changes in accounting policy required by IFRSs [member] | IFRS 9 [member]        
Disclosure of financial assets [Line Items]        
Retained earnings       29,077
Other equity interest       $ 42,165