| Name | InterestIncomeShortTermInvestmentIncreaseDecrease |
|---|---|
| Namespace | http://fasb.org/us-gaap/2021-01-31 |
| Prefix | us-gaap |
| Data type | xbrli:monetaryItemType |
| Period type | duration |
| Substitution Group | xbrli:item |
| Balance | credit |
| Nillable | True |
| Abstract | False |
| Text | Lang | Role | Container role |
|---|---|---|---|
| Interest Income, Short-Term Investment, Increase (Decrease) | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Amount of increase (decrease) in interest income on short-term investment. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Name | Value | Role |
|---|---|---|
| PublishDate | 2021-01 | http://fasb.org/us-gaap/role/tin/value |
| Positive_XBRL_Value | Increase | http://fasb.org/us-gaap/role/tin/value |
| Negative_XBRL_Value | Decrease | http://fasb.org/us-gaap/role/tin/value |
| elementCreationTaxonomyVersion | 2021 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| SourceName | Statistical Disclosures for Banks | http://fasb.org/srt/role/changeNote/changeNote |
| TaxonomyVersion | 2021 | http://fasb.org/srt/role/changeNote/changeNote |
| ChangeDate | 2020-11 | http://fasb.org/srt/role/changeNote/changeNote |
| NewElement | true | http://fasb.org/srt/role/changeNote/changeNote |
| Publisher | SEC | http://www.xbrl.org/2003/role/disclosureRef |
| Name | Regulation S-K (SK) | http://www.xbrl.org/2003/role/disclosureRef |
| Number | 229 | http://www.xbrl.org/2003/role/disclosureRef |
| Section | 1402 | http://www.xbrl.org/2003/role/disclosureRef |
| Paragraph | (c) | http://www.xbrl.org/2003/role/disclosureRef |
| Subparagraph | (2)(iii) | http://www.xbrl.org/2003/role/disclosureRef |
| Name | Relation Type | Role | |
|---|---|---|---|
us-gaap:InterestIncomeInterestEarningAssetIncreaseDecreaseAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThrift | |
us-gaap:InterestIncomeInterestEarningAssetIncreaseDecrease | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThrift | |
us-gaap:InterestIncomeInterestEarningAssetIncreaseDecreaseAbstract | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftInterestRateAndInterestDifferentialAnalysisTable |