Branch Network
Security Bank Midwest Locations & Branches Tyndall, South Dakota
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Security Bank Midwest operates 6 branches from its headquarters in Tyndall, SD, .
Security Bank Midwest branch network
Its 6 branches span 2 states and 6 cities. The most are in SOUTH DAKOTA (4) and MINNESOTA (2). SOUTH DAKOTA holds 79.1% of its branch deposits. Its largest office by deposits is its main office in Tyndall, SD, with $93.0M (39.0% of its branch deposits). It had the same number of branches on June 30, 2025.
Security Bank Midwest at a glance
It reports no CET1 ratio; its Tier 1 leverage ratio was 10.52% at Q2 2026, above the 9% community bank leverage ratio requirement for being considered well capitalized.
- Total assets, Q2 2026
- $304.1M
- Tier 1 leverage ratio, Q2 2026
- 10.52%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Latest call report
- Q2 2026, FFIEC 051
- Established
- 1932
Full financial profile · Is Security Bank Midwest safe? · Security Bank Midwest call report · 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: Tyndall, SD (1 branch) | 1 of 1 | 100.0% | $93.0M |
| State: SD (4 branches) | 39 of 82 | <0.1% | $188.9M |
Ranked by total assets among banks headquartered in the state: Largest banks in South Dakota.
Share by county and metro area
Security Bank Midwest'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 |
|---|---|---|---|---|
| Bon Homme, SD (1 branch) | 1 of 5 | 39.2% | $93.0M | $237.5M |
| Turner, SD (2 branches) | 2 of 5 | 23.1% | $76.1M | $329.1M |
| Jackson, MN (2 branches) | 3 of 6 | 16.2% | $49.9M | $308.3M |
| Lincoln, SD (1 branch) | 25 of 26 | <0.1% | $19.7M | $647.52B |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Sioux Falls, SD (3 branches) | 25 of 39 | <0.1% | $95.8M | $1.13T |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| Security Bank Midwest (main office) | Tyndall, SD | 57066 | $93.0M |
| Chancellor Branch | Chancellor, SD | 57015 | $67.1M |
| Heron Lake Br | Heron Lake, MN | 56137 | $29.2M |
| Jackson, Mn Branch | Jackson, MN | 56143 | $20.8M |
| Lennox Branch | Lennox, SD | 57039 | $19.7M |
| Viborg Branch | Viborg, SD | 57070 | $9.0M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 485) · FFIEC NIC profile (RSSD 435255)