Branch Network
Cornerstone State Bank Locations & Branches Montgomery, Minnesota
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Cornerstone State Bank operates 7 branches from its headquarters in Montgomery, MN, .
Cornerstone State Bank branch network
All 7 branches are in MINNESOTA, across 7 cities. Its largest office by deposits is the Le Sueur Branch office in Le Sueur, MN, with $54.6M (24.4% of its branch deposits). It had the same number of branches on June 30, 2025.
Cornerstone State Bank at a glance
It reports no CET1 ratio; its Tier 1 leverage ratio was 10.60% at Q2 2026, above the 9% community bank leverage ratio requirement for being considered well capitalized.
- Total assets, Q2 2026
- $247.0M
- Tier 1 leverage ratio, Q2 2026
- 10.60%
- Deposit insurance
- FDIC
- Regulator
- FDIC
- Latest call report
- Q2 2026, FFIEC 041
- Established
- 1974
Full financial profile · Is Cornerstone State Bank safe? · Cornerstone State Bank 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: Montgomery, MN (1 branch) | 2 of 2 | 23.8% | $31.1M |
| State: MN (7 branches) | 128 of 277 | <0.1% | $223.9M |
Ranked by total assets among banks headquartered in the state: Largest banks in Minnesota.
Share by county and metro area
Cornerstone State 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 |
|---|---|---|---|---|
| Le Sueur, MN (2 branches) | 4 of 8 | 10.6% | $85.7M | $810.4M |
| Scott, MN (1 branch) | 13 of 16 | 1.6% | $44.6M | $2.79B |
| Sibley, MN (1 branch) | 4 of 10 | 9.2% | $37.3M | $403.8M |
| Blue Earth, MN (2 branches) | 15 of 17 | 1.4% | $36.7M | $2.72B |
| Carlton, MN (1 branch) | 7 of 8 | 4.2% | $19.6M | $470.2M |
Metro areas
| Metro area | Rank | Deposit share | Deposits | Metro total |
|---|---|---|---|---|
| Minneapolis-St. Paul-Bloomington, MN-WI (3 branches) | 78 of 124 | <0.1% | $130.3M | $252.68B |
| Mankato, MN (2 branches) | 18 of 19 | 1.1% | $36.7M | $3.49B |
| Duluth, MN-WI (1 branch) | 24 of 26 | 0.3% | $19.6M | $6.78B |
| Branch | Location | ZIP | Deposits |
|---|---|---|---|
| Le Sueur Branch | Le Sueur, MN | 56058 | $54.6M |
| Belle Plaine Branch | Belle Plaine, MN | 56011 | $44.6M |
| Green Isle Branch | Green Isle, MN | 55338 | $37.3M |
| Cornerstone State Bank (main office) | Montgomery, MN | 56069 | $31.1M |
| Madison Lake Branch | Madison Lake, MN | 56063 | $25.5M |
| 1516 Cloquet Avenue Branch | Cloquet, MN | 55720 | $19.6M |
| Eagle Lake Branch | Eagle Lake, MN | 56024 | $11.3M |
Source: FDIC Summary of Deposits, June 30, 2026. How the survey works.
Regulator records: FDIC BankFind (cert 21525) · FFIEC NIC profile (RSSD 914853)