Branch Network
Security Trust & Savings Bank Locations & Branches Storm Lake, Iowa
BankRegReports is independent of Security Trust & Savings Bank and never asks for online banking logins or passwords.
Security Trust & Savings Bank operates 3 branches from its headquarters in Storm Lake, IA, .
Security Trust & Savings Bank branch network
All 3 branches are in IOWA, across 2 cities. Storm Lake, IA has the most of its branches, 2. Its largest office by deposits is its main office in Storm Lake, IA, with $196.8M (82.2% of its branch deposits). It had the same number of branches on June 30, 2025.
Security Trust & Savings Bank at a glance
Its CET1 capital ratio was 31.77% at Q2 2026, comfortably above the 7% level required once the capital conservation buffer is included.
- Total assets, Q2 2026
- $266.4M
- CET1 ratio, Q2 2026
- 31.77%
- Deposit insurance
- FDIC
- Regulator
- Federal Reserve
- Established
- 1908
Full financial profile · Is Security Trust & Savings Bank safe? · 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: Storm Lake, IA (2 branches) | 2 of 4 | 25.9% | $196.8M |
| State: IA (3 branches) | 119 of 261 | 0.2% | $239.4M |
Ranked by total assets among banks headquartered in the state: Largest banks in Iowa.
Share by county and metro area
Security Trust & Savings Bank'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 |
|---|---|---|---|---|
| Buena Vista, IA (3 branches) | 2 of 6 | 24.7% | $239.4M | $969.0M |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Storm Lake, IA (3 branches) | 2 of 6 | 24.7% | $239.4M | $969.0M |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| Security Trust & Savings Bank (main office) | Storm Lake, IA | 50588 | $196.8M |
| Rembrandt Branch | Rembrandt, IA | 50576 | $42.6M |
| Auto Branch | Storm Lake, IA | 50588 | $0 |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 968) · FFIEC NIC profile (RSSD 363648)