Bank · FDIC insured
Cornerstone State Bank
A $247M bank headquartered in Montgomery, MN, with 7 branches in Minnesota.
Rates
No Carrot Score yet: it needs scores for at least two of CDs, savings, auto loans and credit cards. CDs: published rates need another account or activity, so they are not scored. Savings: rates are not published online. Auto loans: no rates found on its website. Credit cards: no rates found on its website.
- CDs—3.60%Needs another account or monthly activityCD rates →
Deposits are federally insured by the FDIC up to $250,000 per depositor.
About Cornerstone State Bank
Chartered in 1974 when Le Sueur State Bank opened in Le Sueur, Minnesota, Cornerstone State Bank has expanded into seven Minnesota communities.
As an independent locally owned bank, Cornerstone State Bank is dedicated to hometown service and supporting the growth of its customers and local communities.
The bank adopted the Cornerstone State Bank name in 1997, moved its charter to Montgomery in 2008, and merged with Peoples State Bank of Madison Lake in 2016.
- Headquarters
- 401 4th St Nw, Montgomery, MN 56069
- FDIC certificate
- 21525 ↗
Branches
7 branches in Minnesota
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Minnesota
7 branches
Minneapolis area · 3
- Cornerstone State BankMain office401 4th St Nw, Montgomery, MN 56069Directions
- Belle Plaine Branch406 E Poplar St, Belle Plaine, MN 56011Directions
- Le Sueur Branch415 N Main St, Le Sueur, MN 56058Directions
Mankato area · 2
- Eagle Lake Branch600 Parkway Ave, Eagle Lake, MN 56024Directions
- Madison Lake Branch500 Main St, Madison Lake, MN 56063Directions
Duluth area · 1
- 1516 Cloquet Avenue Branch1516 Cloquet Ave, Cloquet, MN 55720Directions
Green Isle area · 1
- Green Isle Branch451 3rd St, Green Isle, MN 55338Directions
Walk-in offices from the FDIC directory as of September 4, 2026. Directions open Google Maps. A nearby branch doesn’t mean you can join or open an account.
Financial details
| Measure | This bank | Peers’ middle | Strongest quarter |
|---|---|---|---|
| CapitalLeverage ratio | 10.60% | 10.98% | 13.00% or more |
| Troubled loansNoncurrent | 0.80% | 0.42% | 0.09% or less |
| ProfitabilityReturn on assets | 1.49% | 1.24% | 1.68% or more |
| LendingLoans per $100 deposited | $68 | $81 | — |
- CapitalLeverage ratio10.60%Peers’ middle 10.98% · Top 25% 13.00%+
- Troubled loansNoncurrent0.80%Peers’ middle 0.42% · Top 25% ≤0.09%
- ProfitabilityReturn on assets1.49%Peers’ middle 1.24% · Top 25% 1.68%+
- LendingLoans per $100 deposited$68Peers’ middle $81
Compared with the 2,650 banks with $100 million to $1 billion in assets. The strongest quarter is what the best 25% of them reach: more capital and profit, fewer troubled loans. Lending has no better end.Troubled loans are noncurrent: 90 or more days late, or no longer earning interest.
Regulators’ own ratings of Cornerstone State Bank are confidential. These figures are what it reports to the FDIC each quarter, set beside its peers; they aren’t a rating.