- DefinitionAmortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
 
+ ReferencesReference 1: http://www.xbrl.org/2003/role/disclosureRef
 -Topic 944
 -SubTopic 210
 -Name Accounting Standards Codification
 -Section S99
 -Paragraph 1
 -Subparagraph (SX 210.7-03(a)(1))
 -Publisher FASB
 -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1
Reference 2: http://www.xbrl.org/2003/role/disclosureRef
 -Topic 320
 -SubTopic 10
 -Name Accounting Standards Codification
 -Section 50
 -Paragraph 2
 -Subparagraph (a)
 -Publisher FASB
 -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2
Reference 3: http://www.xbrl.org/2003/role/disclosureRef
 -Topic 326
 -SubTopic 30
 -Name Accounting Standards Codification
 -Section 45
 -Paragraph 1
 -Publisher FASB
 -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1
 
+ Details
|  Name: | 
us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis | 
|  Namespace Prefix: | 
us-gaap_ | 
|  Data Type: | 
xbrli:monetaryItemType | 
|  Balance Type: | 
debit | 
|  Period Type: | 
instant |