| Standard label: | Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] |
| Name: | us-gaap:FederalHomeLoanBankCertificatesAndObligationsFHLBMember |
| Documentation: | Investments in securities issued by or through the member banks of the federal home loan bank (FHLB). |
| 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:FederalHomeLoanBankCertificatesAndObligationsFHLBMember |
| Label | Role | Language |
| Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 942 210 S99 1 (SX 210.9-03.13,16) | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |