There are many different types of banks in the United States which are classified depending on the types of banking services offered. Financial institutions known as thrifts got that name because they originally were involved in offering certificates of deposits and savings accounts to individual savers. The thrifts then used the deposits to make mortgage and other types of loans to the local community.The number of thrifts in the United States has declined greatly over the past 30 years due to the expansion of banking services. Banks such as thrifts that offered only a limited number of banking services were unable to compete with other banks offering a full line of services. In addition, the S&L crisis resulted in the failure of many thrifts that had concentrated on home mortgage lending.