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Capital Management, Corporate Governance Transparency Policy and Risk Management - Summary of Liquidity Ratios Arising from Dividing Net Liquid Assets, Cash and Cash Equivalents by Total Deposits (Detail)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Liquidity Risk [line items]    
Liquidity ratio 86.39% 57.75%
Weighted average [member]    
Disclosure Of Liquidity Risk [line items]    
Liquidity ratio 81.57% 61.24%
Maximum Average Term [member]    
Disclosure Of Liquidity Risk [line items]    
Liquidity ratio 87.13% 70.13%
Minimum Average Term [member]    
Disclosure Of Liquidity Risk [line items]    
Liquidity ratio 71.49% 51.73%