Investment Objectives and Goals - BlackRock Summit Cash Reserves Fund |
Apr. 30, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund OverviewKey Facts About BlackRock Summit Cash Reserves Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of BlackRock Summit Cash Reserves Fund (the “Fund”) of BlackRock Financial Institutions Series Trust (the “Trust”) is to seek current income, preservation of capital and liquidity available from investing in a diversified portfolio of short-term money market securities.
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