| Standard label: | SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Amortization of Premium |
| Name: | us-gaap:MortgageLoansOnRealEstateAmortizationOfPremium |
| Documentation: | Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from amortization of premium. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:MortgageLoansOnRealEstateAmortizationOfPremium |
| Label | Role | Language |
| SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Amortization of Premium | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 948 310 S99 1 (SX 210.12-29(Footnote 6)) | http://www.xbrl.org/2003/role/disclosureRef | 948 |