Branch Network
Security National Bank of South Dakota Locations & Branches Dakota Dunes, South Dakota
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Security National Bank of South Dakota operates 3 branches from its headquarters in Dakota Dunes, SD, . Its main office is at 325 Dakota Dunes Blvd, Dakota Dunes, SD 57049.
Security National Bank of South Dakota branch network
All 3 branches are in SOUTH DAKOTA, across 2 cities. Sioux Falls, SD has the most of its branches, 2. Its largest office by deposits is its main office in Dakota Dunes, SD, with $89.3M (45.8% of its branch deposits). It had the same number of branches on June 30, 2025.
Security National Bank of South Dakota at a glance
It reports no CET1 ratio; its Tier 1 leverage ratio was 14.12% at Q2 2026, above the 9% community bank leverage ratio requirement for being considered well capitalized.
- Total assets, Q2 2026
- $251.5M
- Tier 1 leverage ratio, Q2 2026
- 14.12%
- Deposit insurance
- FDIC
- Regulator
- OCC
- Latest call report
- Q2 2026, FFIEC 051
- Established
- 1997
Full financial profile · Is Security National Bank of South Dakota safe? · Security National Bank of South Dakota Q3 2026 call report, filed October 27, 2026 (preliminary) · Routing number
Deposit market share
Share of all FDIC-insured deposits held in each area, from the June 30, 2026 Summary of Deposits. Rank 1 is the largest holder. Shares are by bank charter, not by holding company.
| Area | Rank | Deposit share | Deposits |
|---|---|---|---|
| City: Dakota Dunes, SD (1 branch) | 2 of 5 | 23.3% | $89.3M |
| State: SD (3 branches) | 38 of 82 | <0.1% | $194.7M |
Ranked by total assets among banks headquartered in the state: Largest banks in South Dakota.
Share by county and metro area
Security National Bank of South Dakota's share of FDIC-insured deposits in the counties and metro areas where it has branches, from the June 30, 2026 Summary of Deposits. Up to the ten largest of each are shown, by the bank's deposits. Rank 1 is the largest holder. Banks only: credit unions are not in the Summary of Deposits.
Counties
| County | Rank | Deposit share | Deposits | County total |
|---|---|---|---|---|
| Union, SD (1 branch) | 4 of 9 | 11.5% | $89.3M | $773.2M |
| Lincoln, SD (1 branch) | 17 of 26 | <0.1% | $65.5M | $647.52B |
| Minnehaha, SD (1 branch) | 22 of 25 | <0.1% | $40.0M | $478.92B |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Sioux Falls, SD (2 branches) | 22 of 39 | <0.1% | $105.5M | $1.13T |
| Sioux City, IA-NE-SD (1 branch) | 17 of 30 | 1.9% | $89.3M | $4.77B |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| Security National Bank of South Dakota (main office) | Dakota Dunes, SD | 57049 | $89.3M |
| 74th and Louise Branch | Sioux Falls, SD | 57108 | $65.5M |
| 26th Street Branch | Sioux Falls, SD | 57106 | $40.0M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 34394) · FFIEC NIC profile (RSSD 2529176)