Security National Bank of South Dakota is locally owned, full-service community bank located in Sioux Falls and Dakota Dunes. We are a subsidiary of Security National Corporation, which has set the standard for integrity, liability, innovation and commitment to providing customers with superior service in the banking industry. Since its founding in 1884, Security National Bank (and now Security National Corporation) has accumulated more than $1 billion in bank assets and $3 billion in Wealth Management assets.