| Document and Entity Information | Jan. 19, 2022 |
| Cover [Abstract] | |
| Amendment Flag | true |
| Entity Central Index Key | 0001519401 |
| Document Type | 8-K/A |
| Document Period End Date | Jan. 19, 2022 |
| Entity Registrant Name | Regional Management Corp. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-35477 |
| Entity Tax Identification Number | 57-0847115 |
| Entity Address, Address Line One | 979 Batesville Road |
| Entity Address, Address Line Two | 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.10 par value |
| Trading Symbol | RM |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Description | This Current Report on Form 8-K/A (this “Amendment”) amends the Current Report on Form 8-K filed on January 19, 2022 (the “Original Form 8-K”) solely to correct the description of Mr. Bancroft’s business experience. Item 5.02 of the Original Form 8-K incorrectly referenced Mr. Bancroft as serving as a current Executive Vice President of Chubb Limited and inadvertently referred to Chubb Limited as the acquiror of ACE Limited. Further, Exhibit 99.1 of the Original Form 8-K, which incorrectly referred to Mr. Bancroft as a current Executive Vice President of Chubb Limited, has been corrected on Exhibit 99.1 to this Amendment. |
