| Name | DepositAssetsOrLiabilitiesChangeInAmountsBasedOnChangeInAssumptionsSupportingExpectedRecoveryAmounts |
|---|---|
| Namespace | http://fasb.org/us-gaap/2020-01-31 |
| Prefix | us-gaap |
| Data type | xbrli:stringItemType |
| Period type | duration |
| Substitution Group | xbrli:item |
| Balance | None |
| Nillable | True |
| Abstract | False |
| Text | Lang | Role | Container role |
|---|---|---|---|
| Deposit Assets or Liabilities, Change in Amounts Based on Change in Assumptions Supporting Expected Recovery Amounts (Deprecated 2020-01-31) | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| On contracts that transfer only significant underwriting risk, description of an adjustment in the carrying amount of recorded deposit assets or liabilities resulting from a change in the underlying assumptions on which calculation of the initial amount of expected recoveries (in other words, the initial amount of the deposit asset or liability) had been based. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Name | Relation Type | Role | |
|---|---|---|---|
us-gaap:DeprecatedItems | parent-child | http://fasb.org/us-gaap/role/deprecated/deprecated |