Companies for Umbrella Insurance

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I need to get an umbrella insurance policy. Are there any companies that will give me an umbrella policy when my other policies are not with them? I called USAA and they told me that they can only give me an umbrella policy if all of my underlying policies are with them. I currently have my primary residence and my two rental properties with USAA but my car insurance is with Geico. I looked into switching my car insurance to USAA so I could get the umbrella policy through them but the car insurance was way too expensive. I am happy with all of my current policies and would like to just get an umbrella policy from another company so I don't need to merge auto insurance with property insurance but I don't know if there are companies that will do umbrella insurance without the other policies being with them too. If it varies by state, I am in Pennsylvania.