A “bank” is a corporation having a place of business in this state, where credits are opened by the deposit of money or currency, or the collection of the same, subject to be paid or remitted on draft, check, or order; and where money is loaned or advanced on stocks, bonds, bullion, bills of exchange, or promissory notes, and where the same are received for discount or sale. A “savings bank” is a corporation authorized to do business under chapter 50. Every “bank” or “savings bank” in this state shall at all times be under the supervision and subject to the control of the commissioner of commerce, and when so conducted the business shall be known as “banking.”