How to defend yourself against a wrongful case of embezzlement?

I am working in the finance department of an organization. I mistakenly deposited excess salary into my own account and then later on deposited back again in the company account.

In all this, I have approvals and signatures from every person which clearly shows that it's a mistake and clearly shows that my intentions were not wrong. Now the company terminates me and a legal advisor will file a case on me.

I need your help and support on this matter.