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Capital Management, Corporate Governance Transparency Policy and Risk Management - Summary of Aging Analysis of Performing Loans in Arrears (Detail) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Not later than one month [member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 99.40% | 99.60%
Not later than one month [member] | Commercial loans [Member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 98.90% | 99.50%
Not later than one month [member] | Comparable loans [Member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 99.70% | 99.80%
Not later than one month [member] | Consumer loans [member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 99.50% | 99.50%
Later than one month and not later than three months [member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.50% | 0.40%
Later than one month and not later than three months [member] | Commercial loans [Member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.90% | 0.50%
Later than one month and not later than three months [member] | Comparable loans [Member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.30% | 0.20%
Later than one month and not later than three months [member] | Consumer loans [member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.50% | 0.50%
Later than three months and not later than six months [member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.00% | 0.00%
Later than three months and not later than six months [member] | Commercial loans [Member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.00% | 0.00%
Later than three months and not later than six months [member] | Comparable loans [Member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.00% | 0.00%
Later than three months and not later than six months [member] | Consumer loans [member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.00% | 0.00%
Later than six months and not later than one year [member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.10% | 0.00%
Later than six months and not later than one year [member] | Commercial loans [Member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.20% | 0.00%
Later than six months and not later than one year [member] | Comparable loans [Member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.00% | 0.00%
Later than six months and not later than one year [member] | Consumer loans [member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.00% | 0.00%
Later than one year [member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.00% | 0.00%
Later than one year [member] | Commercial loans [Member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.00% | 0.00%
Later than one year [member] | Comparable loans [Member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.00% | 0.00%
Later than one year [member] | Consumer loans [member] |  |
Disclosure of aging analysis of performing loans in arrears [Line Items] |  |
Percentage of performing loan in arrears | 0.00% | 0.00%

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