| Name | AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax |
|---|---|
| Namespace | http://fasb.org/us-gaap/2020-01-31 |
| Prefix | us-gaap |
| Data type | xbrli:monetaryItemType |
| Period type | instant |
| Substitution Group | xbrli:item |
| Balance | credit |
| Nillable | True |
| Abstract | False |
| Text | Lang | Role | Container role |
|---|---|---|---|
| Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax, Total | en-US | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Name | Value | Role |
|---|---|---|
| Note | Element is intended to be used in periods before adoption of amendments from Accounting Standards Update 2016-01. Upon effective date of amendments from Accounting Standards Update 2016-01, element will be transitional and intended to be used by entity that has not adopted amendments from Accounting Standards Update 2016-01. | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| PublishDate | 2018-01 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Source | ASU | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| SourceName | Financial Instruments-Recognition and Measurement | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Source_ASU_Number | 2016-01 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |