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First Security Bank of Roundup Locations & Branches Roundup, Montana
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First Security Bank of Roundup operates 1 branch from its headquarters in Roundup, MT, .
First Security Bank of Roundup branch network
Its one office is in Roundup, MONTANA. It had the same number of branches on June 30, 2025.
First Security Bank of Roundup at a glance
Its CET1 capital ratio was 27.14% at Q2 2026, comfortably above the 7% level required once the capital conservation buffer is included.
- Total assets, Q2 2026
- $94.5M
- CET1 ratio, Q2 2026
- 27.14%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Latest call report
- Q2 2026, FFIEC 051
- Established
- 1971
Full financial profile · Is First Security Bank of Roundup safe? · First Security Bank of Roundup 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: Roundup, MT (1 branch) | 1 of 1 | 100.0% | $81.8M |
| State: MT (1 branch) | 37 of 48 | 0.2% | $81.8M |
Ranked by total assets among banks headquartered in the state: Largest banks in Montana.
Share by county and metro area
First Security Bank of Roundup'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 |
|---|---|---|---|---|
| Musselshell, MT (1 branch) | 1 of 1 | 100.0% | $81.8M | $81.8M |
Metro area share: not on file. None of this bank's branches sit in a metropolitan or micropolitan area in the FDIC branch directory.
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| First Security Bank of Roundup (main office) | Roundup, MT | 59072 | $81.8M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 20479) · FFIEC NIC profile (RSSD 625056)