Branch Network
Security Bank Locations & Branches New Auburn, Wisconsin
BankRegReports is independent of Security Bank and never asks for online banking logins or passwords.
Security Bank operates 4 branches from its headquarters in New Auburn, WI, .
Security Bank branch network
All 4 branches are in WISCONSIN, across 4 cities. Its largest office by deposits is its main office in New Auburn, WI, with $124.4M (57.5% of its branch deposits). It had the same number of branches on June 30, 2025.
Security Bank at a glance
It reports no CET1 ratio; its Tier 1 leverage ratio was 11.58% at Q2 2026, above the 9% community bank leverage ratio requirement for being considered well capitalized.
- Total assets, Q2 2026
- $253.8M
- Tier 1 leverage ratio, Q2 2026
- 11.58%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Established
- 1907
Full financial profile · Is Security 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: New Auburn, WI (1 branch) | 1 of 1 | 100.0% | $124.4M |
| State: WI (4 branches) | 119 of 185 | 0.1% | $216.4M |
Ranked by total assets among banks headquartered in the state: Largest banks in Wisconsin.
Share by county and metro area
Security 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 |
|---|---|---|---|---|
| Chippewa, WI (2 branches) | 2 of 13 | 12.5% | $165.3M | $1.32B |
| Dunn, WI (2 branches) | 4 of 7 | 9.6% | $51.1M | $530.0M |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Eau Claire, WI (2 branches) | 8 of 22 | 4.4% | $165.3M | $3.73B |
| Menomonie, WI (2 branches) | 4 of 7 | 9.6% | $51.1M | $530.0M |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| Security Bank (main office) | New Auburn, WI | 54757 | $124.4M |
| Ridgeland Office Branch | Ridgeland, WI | 54763 | $41.2M |
| Bloomer Office | Bloomer, WI | 54724 | $40.9M |
| Sand Creek Branch | Sand Creek, WI | 54765 | $9.8M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 10015) · FFIEC NIC profile (RSSD 20053)