| Standard label: | Certain Loans Acquired in Transfer Accounted for as Held-to-maturity Debt Securities, Outstanding Balance |
| Name: | us-gaap:CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesOutstandingBalance |
| Documentation: | The undiscounted sum of all amounts, including amounted deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date. This relates to loans accounted for as held-to-maturity debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:CertainLoansAcquiredInTransferAccountedForAsHeldToMaturityDebtSecuritiesOutstandingBalance |
| Label | Role | Language |
| Certain Loans Acquired in Transfer Accounted for as Held-to-maturity Debt Securities, Outstanding Balance | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 310 30 50 2 (a)(1) | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |
| FASB Accounting Standards Codification 310 30 15 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 310 |