Dad obsessing over money- wants access to checkbook and CC. I don't know how to manage this.

Dad has Alzheimer’s- progressive cognitive decline and inability to care for self led to assisted living community and me managing finances. He does not believe he has any problems and that he can care for himself. He obsesses over money and thinks I am stealing and lying to him. He is verbally abusive and hard to redirect. He wants his bank card so he can withdraw money anytime he wants. He has no car but he is still physically fit. He says he can just walk to a bank. Which he would. There are banks near the assisted living home on busy street, that I am sure he’d try to walk to. Prior to taking over finances he was withdrawing 100-200 dollars a day and either losing it or hiding and forgetting where he put it. He never remembers taking the money out. He does not recognize value of currency anymore. It is a constant source of tension anger and stress. Whenever I visit it is all he talks about. I don’t know how to manage this. I know he cannot have possession of CC but his accusations and anger are so hard.