I just bought a condo. Do I need homeowners or renters insurance? Who do you recommend I use?

I'm looking for something cheap since I'm just out of college. The exterior of the building is already covered. I guess all I have to worry about is fire and theft on the interior.
Update: Yes, I own the condo and I have 100% financing. The lender didn't specify any requirements for what kind of insurance I should purchase.
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