Well, if Bitcoin has a market cap of $1.37 trillion, the money is not owned by one person (Satoshi) alone but a compound sum of money from lots of investors from all over the world. When referring to the banks, it is a centralized organization, and they have some other investments and real assets that are worth a large sum of money, but when calculating their market cap, I think only investors assets and funds are what are being summed up; they don't include their own profit and assets. In my opinion, Bitcoin should not really be compared with those banks.