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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
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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%

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