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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, 2021
Dec. 31, 2020
Disclosure Of Liquidity Risk [line items]    
Liquidity ratio 87.37% 86.39%
Weighted average [member]    
Disclosure Of Liquidity Risk [line items]    
Liquidity ratio 88.63% 81.57%
Maximum Average Term [member]    
Disclosure Of Liquidity Risk [line items]    
Liquidity ratio 92.77% 87.13%
Minimum Average Term [member]    
Disclosure Of Liquidity Risk [line items]    
Liquidity ratio 85.50% 71.49%