| Name | AvailableForSaleSecuritiesTransfersToTradingGrossLosses |
|---|---|
| Namespace | http://fasb.org/us-gaap/2020-01-31 |
| Prefix | us-gaap |
| Data type | xbrli:monetaryItemType |
| Period type | duration |
| Substitution Group | xbrli:item |
| Balance | debit |
| Nillable | True |
| Abstract | False |
| Text | Lang | Role | Container role |
|---|---|---|---|
| Available-for-sale Securities, Transfers to Trading, Gross Losses | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| This item represents the gross amount of losses included in earnings from transfers of securities from the available-for-sale category into the trading category. Such losses represent the unrealized losses included in other comprehensive income associated with the securities transferred from the available-for-sale category to the trading category. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |