1.3 million at the moment, and building every night. I'm trying to pull in at least 1 million every night via beetles/sharks, but I'm not very good at sticking to that schedule!
Currently, I have no money in my bank account ^^
It doesn't matter to me, because I already have finished my house and the train station/town hall remodeling
I think I have about 630mil in my main town and 165mil in my other, at the moment. There's also another 5-10mil total floating around in various non-mayor characters' bank accounts.