Branch Network
1st Financial Bank USA Locations & Branches Dakota Dunes, South Dakota
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1st Financial Bank USA operates 2 branches from its headquarters in Dakota Dunes, SD, .
1st Financial Bank USA branch network
Both branches are in SOUTH DAKOTA, across 2 cities. Its largest office by deposits is the Dupree Branch office in Dupree, SD, with $1.08B (99.0% of its branch deposits). It had the same number of branches on June 30, 2025.
1st Financial Bank USA at a glance
Its CET1 capital ratio was 21.06% at Q2 2026, comfortably above the 7% level required once the capital conservation buffer is included.
- Total assets, Q2 2026
- $1.40B
- CET1 ratio, Q2 2026
- 21.06%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Latest call report
- Q2 2026, FFIEC 031
- Established
- 1910
Full financial profile · Is 1st Financial Bank USA safe? · 1st Financial Bank USA 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: Dakota Dunes, SD (1 branch) | 5 of 5 | 3.0% | $11.4M |
| State: SD (2 branches) | 15 of 82 | <0.1% | $1.09B |
Ranked by total assets among banks headquartered in the state: Largest banks in South Dakota.
Share by county and metro area
1st Financial Bank USA'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 |
|---|---|---|---|---|
| Ziebach, SD (1 branch) | 1 of 1 | 100.0% | $1.08B | $1.08B |
| Union, SD (1 branch) | 9 of 9 | 1.5% | $11.4M | $773.2M |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Sioux City, IA-NE-SD (1 branch) | 29 of 30 | 0.2% | $11.4M | $4.77B |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| Dupree Branch | Dupree, SD | 57623 | $1.08B |
| 1st Financial Bank USA (main office) | Dakota Dunes, SD | 57049 | $11.4M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 1673) · FFIEC NIC profile (RSSD 526452)