| Document and Entity Information | Jun. 21, 2024 |
| Document And Entity Information [Line Items] | |
| Entity Registrant Name | MidCap Financial Investment Corp |
| Amendment Flag | false |
| Entity Central Index Key | 0001278752 |
| Document Type | 8-K |
| Document Period End Date | Jun. 21, 2024 |
| Entity Incorporation State Country Code | MD |
| Entity File Number | 814-00646 |
| Entity Tax Identification Number | 52-2439556 |
| Entity Address, Address Line One | 9 West 57th Street |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10019 |
| City Area Code | (212) |
| Local Phone Number | 515-3450 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, $0.001 par value |
| Trading Symbol | MFIC |
| Security Exchange Name | NASDAQ |
| Deferrable Notes [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 8.00% Notes due 2028 |
| Trading Symbol | MFICL |
| Security Exchange Name | NASDAQ |
