In addition to the mutual savings bank just considered, there are several other forms of savings institutions to be found in the United States, such as, (1) stock savings bank, (2) savings department of a commercial bank, (3) guaranty-fund bank, and (4) co-operative association. In addition to these institutions, which are operated by privately owned capital, there is also the postal savings system conducted by the federal government. In several European countries savings banks are also operated by municipalities.