Branch Network
First Security Bank Locations & Branches Mackinaw, Illinois
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First Security Bank operates 4 branches from its headquarters in Mackinaw, IL, .
First Security Bank branch network
All 4 branches are in ILLINOIS, across 3 cities. Mackinaw, IL has the most of its branches, 2. Its largest office by deposits is its main office in Mackinaw, IL, with $68.3M (54.3% of its branch deposits). It had the same number of branches on June 30, 2025.
First Security Bank at a glance
It reports no CET1 ratio; its Tier 1 leverage ratio was 9.22% at Q2 2026, above the 9% community bank leverage ratio requirement for being considered well capitalized.
- Total assets, Q2 2026
- $151.1M
- Tier 1 leverage ratio, Q2 2026
- 9.22%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Established
- 1934
Full financial profile · Is First 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: Mackinaw, IL (2 branches) | 1 of 1 | 100.0% | $80.2M |
| State: IL (4 branches) | 272 of 379 | <0.1% | $126.0M |
Ranked by total assets among banks headquartered in the state: Largest banks in Illinois.
Share by county and metro area
First 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 |
|---|---|---|---|---|
| Tazewell, IL (3 branches) | 7 of 18 | 2.3% | $90.3M | $3.89B |
| Mclean, IL (1 branch) | 20 of 26 | 0.8% | $35.6M | $4.56B |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Peoria, IL (3 branches) | 23 of 43 | 0.8% | $90.3M | $11.06B |
| Bloomington, IL (1 branch) | 20 of 26 | 0.8% | $35.6M | $4.56B |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| First Security Bank (main office) | Mackinaw, IL | 61755 | $68.3M |
| Danvers Branch | Danvers, IL | 61732 | $35.6M |
| Heritage Lake Branch | Mackinaw, IL | 61755 | $11.8M |
| Deer Creek Branch | Deer Creek, IL | 61733 | $10.2M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 3698) · FFIEC NIC profile (RSSD 416339)