| Standard label: | First Mortgage [Member] |
| Name: | us-gaap:FirstMortgageMember |
| Documentation: | Loan secured by real property that has a first (highest) lien on such property in the event of default by the borrower. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:FirstMortgageMember |
| Label | Role | Language |
| First Mortgage [Member] | 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 4)) | http://www.xbrl.org/2003/role/exampleRef | 948 |