People who buy stock in the bank own shares of the business. The Board of Directors are paid a salary. Daily operations are performed by a paid staff. Only people who own stock can vote for the Board of Directors. The customers who use the bank do not have a say.
Income is returned to the stockholders in the form of higher dividends on their shares of stock.
Like other for-profit businesses, banks must pay taxes to the government. Not for profit, not for charity, but for service. Members pool their savings to provide low-cost loans and low fee services to each other. Each member is an equal owner. Exist solely to serve their members.