Yeah, I'm aware of the basic investopedia definition. What I don't understand is what are those assets exactly? What kind of assets can be counted as capital? V

Yeah, I'm aware of the basic investopedia definition. What I don't understand is what are those assets exactly? What kind of assets can be counted as capital? Vault cash? Reserves held at the Fed? And is a performing loan capital? It's an asset that can be sold to other banks. If that's the case, then can't a bank increase its capital by originating good loans? If that's so, then capital requirements don't particularly appear to operationally constraint loan origination and deposit creation.