| Document And Entity Information | 6 Months Ended |
| Jun. 30, 2024 | |
| Document Information [Line Items] | |
| Entity Registrant Name | FLAT ROCK CORE INCOME FUND |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Entity Central Index Key | 0001814390 |
| Document Period End Date | Jun. 30, 2024 |
| N-2 | 6 Months Ended |
| Jun. 30, 2024 $ / shares shares | |
| Cover [Abstract] | |
| Entity Central Index Key | 0001814390 |
| Amendment Flag | false |
| Document Type | N-CSRS |
| Entity Registrant Name | FLAT ROCK CORE INCOME FUND |
| General Description of Registrant [Abstract] | |
| Investment Objectives and Practices [Text Block] | INVESTMENT OBJECTIVE Flat Rock Core Income Fund’s (the “Fund”) investment objective is the preservation of capital while generating current income from its debt investments and seeking to maximize the portfolio’s total return. |
| Risk Factors [Table Text Block] | RISK FACTORS In the normal course of business, the Fund invests in financial instruments and enters into financial transactions where risk of potential loss exists due to such things as changes in the market (market risk) or failure or inability of the other party to a transaction to perform (credit and counterparty risk). See below for a detailed description of select principal risks. The following is not intended to be a comprehensive description of all of the potential risks associated with the Fund. The Fund’s prospectus provides a detailed discussion of the Fund’s risks. Credit Risk. Financial strength and solvency of an issuer are the primary factors influencing credit risk. The Fund could lose money if the issuer or guarantor of a debt security is unable or unwilling, or is perceived (whether by market participants, rating agencies, pricing services or otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. Companies in which the Fund invests could deteriorate as a result of, among other factors, an adverse development in their business, a change in the competitive environment or an economic downturn. As a result, companies that the Adviser may have expected to be stable may operate, or expect to operate, at a loss or have significant variations in operating results, may require substantial additional capital to support their operations or maintain their competitive position, or may otherwise have a weak financial condition or be experiencing financial distress. In addition, inadequacy of collateral or credit enhancement for a debt obligation may affect its credit risk. Although the Fund may invest in investments that the Adviser believes are secured by specific collateral, the value of which may exceed the principal amount of the investments at the time of initial investment, there can be no assurance that the liquidation of any such collateral would satisfy the borrower’s obligation in the event of non-payment of scheduled interest or principal payments with respect to such investment, or that such collateral could be readily liquidated. In addition, in the event of bankruptcy of a borrower, the Fund could experience delays or limitations with respect to its ability to realize the benefits of the collateral securing an investment. Under certain circumstances, collateral securing an investment may be released without the consent of the Fund. Credit risk is typically greater for securities with ratings that are below investment grade (commonly referred to as “junk bonds”). Since the Fund can invest significantly in high-yield investments considered speculative in nature and unsecured investments, this risk may be substantial. The Fund’s right to payment and its security interest, if any, may be subordinated to the payment rights and security interests of more senior creditors. This risk may also be greater to the extent the Fund uses leverage or derivatives in connection with the management of the Fund. Changes in the actual or perceived creditworthiness of an issuer, or a downgrade or default affecting any of the Fund’s securities, could affect the Fund’s performance. Senior Loans. CLO Risk. Middle Market Risk. Global Markets Risk: Valuation Risk: Interest Rate Risk: |
| NAV Per Share | $ / shares | $ 20.82 |
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | |
| Long Term Debt, Title [Text Block] | BORROWINGS The Fund maintains a $75 million revolving line of credit, originally obtained by Flat Rock Capital Corp. through a special purpose wholly-owned subsidiary, FRC Funding I, LLC (“FRC Funding”), which entered into a Loan and Security Agreement (the “Loan Agreement”) with certain financial institutions as lenders (“Lenders”), State Bank and Trust Company as the administrative agent (“State Bank”) and Cadence Business Finance (formerly known as Alostar Capital Finance), as Lead Arranger and Bookrunner, pursuant to which the Lenders agreed to provide the Company with a revolving line of credit (the “Credit Facility”). The Loan Agreement was subsequently amended to add Cadence Bank, N.A. as the administrative agent following its merger with State Bank and Trust, and to add Hitachi Capital America Corp. to the Lenders. In October 2021, the Loan Agreement was further amended, to remove Hitachi Capital America Corp. and replace it with Georgia Banking Company (“GBC”) as a Lender. In June 2022, the Loan Agreement was further amended to add Synovus Bank (“Synovus”) and Woodforest National Bank (“Woodforest”) as Lenders. The current Loan Agreement expires on June 2, 2026. As of June 30, 2024, the Fund had drawn down $40,479,064 from the Credit Facility and the maximum borrowing outstanding during the six month period was $61,006,965. The balance drawn from the Credit Facility is inclusive of $243,750 of upfront fees in addition to the principal balance. The Fund is charged an interest rate of 2.70% above the 1-month Term SOFR (Secured Overnight Financing Rate) plus 0.11448%. The Fund is charged a fee on the average daily unused balance of the Credit Facility of 0.40%. Pursuant to the terms of the Loan Agreement, the Borrowers granted to Cadence for the benefit of the lenders, a security interest and a lien in substantially all of FRC Funding’s assets. The average balance outstanding and weighted average interest rate for the six months ended June 30, 2024 was $52,084,673 and 8.54%, respectively. |
| Outstanding Security, Not Held [Shares] | shares | 12,466,619 |
| Credit Risks [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | Credit Risk. Financial strength and solvency of an issuer are the primary factors influencing credit risk. The Fund could lose money if the issuer or guarantor of a debt security is unable or unwilling, or is perceived (whether by market participants, rating agencies, pricing services or otherwise) as unable or unwilling, to make timely principal and/or interest payments, or to otherwise honor its obligations. Companies in which the Fund invests could deteriorate as a result of, among other factors, an adverse development in their business, a change in the competitive environment or an economic downturn. As a result, companies that the Adviser may have expected to be stable may operate, or expect to operate, at a loss or have significant variations in operating results, may require substantial additional capital to support their operations or maintain their competitive position, or may otherwise have a weak financial condition or be experiencing financial distress. In addition, inadequacy of collateral or credit enhancement for a debt obligation may affect its credit risk. Although the Fund may invest in investments that the Adviser believes are secured by specific collateral, the value of which may exceed the principal amount of the investments at the time of initial investment, there can be no assurance that the liquidation of any such collateral would satisfy the borrower’s obligation in the event of non-payment of scheduled interest or principal payments with respect to such investment, or that such collateral could be readily liquidated. In addition, in the event of bankruptcy of a borrower, the Fund could experience delays or limitations with respect to its ability to realize the benefits of the collateral securing an investment. Under certain circumstances, collateral securing an investment may be released without the consent of the Fund. Credit risk is typically greater for securities with ratings that are below investment grade (commonly referred to as “junk bonds”). Since the Fund can invest significantly in high-yield investments considered speculative in nature and unsecured investments, this risk may be substantial. The Fund’s right to payment and its security interest, if any, may be subordinated to the payment rights and security interests of more senior creditors. This risk may also be greater to the extent the Fund uses leverage or derivatives in connection with the management of the Fund. Changes in the actual or perceived creditworthiness of an issuer, or a downgrade or default affecting any of the Fund’s securities, could affect the Fund’s performance. |
| Senior Loans [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | Senior Loans. |
| CLO Risk [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | CLO Risk. |
| Middle Market Risk [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | Middle Market Risk. |
| Global Markets Risk [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | Global Markets Risk: |
| Valuation Risk [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | Valuation Risk: |
| Interest Rate Risk [Member] | |
| General Description of Registrant [Abstract] | |
| Risk [Text Block] | Interest Rate Risk: |
