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.

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I use USAA and have all my insurance though them.  One place for everything.  I know everything is paid and I can easily see it.  I linked up my business account in the app as well and they just pull the payments out of it.  It's all one monthly payment so my business pays the car insurance as well.  I'll let the CPA work that out.