Security National Bank was founded in 1884 and is located in  Sioux City, Iowa.

Security National Corporation, located in South Dakota is a multi-bank holding company and owns the following banks:

SNB of South Dakota:

               Located in the Dakota Dunes and Sioux Falls, SD

SNB of Sioux City Iowa:

                Located in Sioux City and Akron, IA

Northwestern Bank:

               Located in Orange City and Sheldon, IA

First State Bank of Mapleton, IA:

               Located in Mapleton, IA

Security National Bank of South Dakota joined Security National Corporation in 1997.  This office located in Dakota Dunes, South Dakota offers a private banking atmosphere and heavily emphasizes its Investment Management and Trust Services.  In 2006, Security National Bank of South Dakota opened offices in Sioux Falls, South Dakota  at 74th St and Louise Ave, and also at 26th and Lorraine.