Can I buy a house with terrible credit and no bank account. Although, I do have a large down payment.?

I am a PA resident and looking to buy a house. How can I or can I do this with having bad credit and no bank account?
Update: Would it be possible if I had a co-signer with excellent credit?
Update 2: Yes, I would be able to put at least 20% down. And I don't have a bank account because I don't want one at this time.
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