| Document And Entity Information | Nov. 12, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 12, 2024 |
| Entity Registrant Name | Regional Management Corp. |
| Entity Central Index Key | 0001519401 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-35477 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 57-0847115 |
| Entity Address, Address Line One | 979 Batesville Road, Suite B |
| Entity Address, City or Town | Greer |
| Entity Address, State or Province | SC |
| Entity Address, Postal Zip Code | 29651 |
| City Area Code | (864) |
| Local Phone Number | 448-7000 |
| Entity Information, Former Legal or Registered Name | Not Applicable |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.10 par value |
| Trading Symbol | RM |
| Security Exchange Name | NYSE |
