| Standard label: | Participating Mortgage Loans, Extinguishment Gain (Loss) |
| Name: | us-gaap:ParticipatingMortgageLoansExtinguishmentGainLoss |
| Documentation: | States the amount of gain (loss) resulting from a participating loan extinguished before its due date. |
| 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:ParticipatingMortgageLoansExtinguishmentGainLoss |
| Label | Role | Language |
| Participating Mortgage Loans, Extinguishment Gain (Loss) | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 470 30 40 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 470 |
| FASB Accounting Standards Codification 470 30 45 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 470 |