Branch Network
1NB Bank Locations & Branches Carlyle, Illinois
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1NB Bank operates 5 branches from its headquarters in Carlyle, IL, .
1NB Bank branch network
Its 5 branches span 2 states and 4 cities. The most are in ILLINOIS (4) and MISSOURI (1). ILLINOIS holds 99.7% of its branch deposits. Carlyle, IL has the most of its branches, 2. Its largest office by deposits is the 1350 12th Street Facility office in Carlyle, IL, with $98.5M (37.9% of its branch deposits). On June 30, 2025 it had 4 branches, 1 fewer than in 2026.
1NB Bank at a glance
It reports no CET1 ratio; its Tier 1 leverage ratio was 10.29% at Q2 2026, above the 9% community bank leverage ratio requirement for being considered well capitalized.
- Total assets, Q2 2026
- $319.0M
- Tier 1 leverage ratio, Q2 2026
- 10.29%
- Deposit insurance
- FDIC
- Regulator
- Federal Reserve
- Established
- 1878
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: Carlyle, IL (2 branches) | 1 of 3 | 60.0% | $176.3M |
| State: IL (4 branches) | 180 of 379 | <0.1% | $259.3M |
Ranked by total assets among banks headquartered in the state: Largest banks in Illinois.
Share by county and metro area
1NB 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 |
|---|---|---|---|---|
| Clinton, IL (4 branches) | 3 of 13 | 16.1% | $259.3M | $1.61B |
| Cape Girardeau, MO (1 branch) | 16 of 16 | <0.1% | $831K | $3.48B |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| St. Louis, MO-IL (4 branches) | 61 of 111 | 0.2% | $259.3M | $141.72B |
| Cape Girardeau, MO-IL (1 branch) | 17 of 17 | <0.1% | $831K | $3.71B |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| 1350 12th Street Facility | Carlyle, IL | 62231 | $98.5M |
| 1NB Bank (main office) | Carlyle, IL | 62231 | $77.8M |
| Aviston Branch | Aviston, IL | 62216 | $68.5M |
| St. Rose Facility Branch | Breese, IL | 62230 | $14.4M |
| Cape Girardeau Branch | Cape Girardeau, MO | 63701 | $831K |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 14761) · FFIEC NIC profile (RSSD 614948)