Cornerstone State Bank
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Data as of · sourced from FFIEC call reports. How we update
Cornerstone State Bank is an FDIC-insured commercial bank headquartered in Montgomery, MN, established in 1974 (FDIC certificate 21525), and it is supervised by the FDIC. At Q2 2026 it reported total assets of $247.0M, up 4.9% from Q2 2025, the 100th largest of 221 banks headquartered in Minnesota. 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.
- Charter
- Commercial bank
- Regulator
- FDIC
- Deposit insurance
- FDIC
- FDIC certificate
- 21525
- Headquarters
- Montgomery, MN
- Established
- 1974
- Total assets, Q2 2026
- $247.0M
- Assets vs Q2 2025
- +4.9%
- Tier 1 leverage ratio, Q2 2026
- 10.60%
- Domestic offices
- 7 FDIC institution directory, current count
- Routing number
- 091905059
- Holding company
- CORNERSTONE BANCORPORATION, INC.
- Asset rank in state
- 100th of 221 in Minnesota
Problem loans are rising at Cornerstone State Bank. It reported $247 million in assets at June 30, 2026, up 4.9% from a year earlier. Loans on nonaccrual or 90 or more days past due, net of government guarantees, rose to 0.80% of loans from 0.44% a year earlier. It returns 21.2% a year on shareholders' equity, higher than about three-quarters of the 2,660 banks with $100 million to $1 billion in assets (median 12.5%).
Paper losses on its bond portfolio are shrinking: unrealized losses of $6.6 million equal 25% of Tier 1 capital, down from 33% a year earlier.
As of June 30, 2026, Cornerstone State Bank reported a return on assets of 1.62%, a nonperforming-loan ratio of 0.80% and a Texas ratio of 5.53%. The figures come from its call report filed with the FFIEC.
By total assets at Q2 2026, Cornerstone State Bank is the 100th largest of the 221 banks headquartered in Minnesota. Between Q1 2026 and Q2 2026, its total assets rose 1.6% to $247.0M, loans fell 2.2% and deposits rose 1.1%. 1-4 family residential loans made up 53.0% of its total loans on June 30, 2026, its largest category; next came owner-occupied commercial real estate loans at 14.5%. Its 7 offices in the FDIC Summary of Deposits are in 7 cities in MN; its Le Sueur office books 24% of its branch deposits. By the capital ratios in its Q2 2026 call report, Cornerstone State Bank meets the community bank leverage ratio test for well capitalized.
Headquarters Profile
- Address
- 401 4th St Nw, Montgomery, MN 56069
- County
- Le Sueur
- Metro Area
- Minneapolis-St. Paul-Bloomington, MN-WI
- Charter
- Commercial bank, state charter, Fed non-member, FDIC-supervised
- Primary Regulator
- FDIC
- FDIC Region
- Kansas City (Region 11)
- Federal Reserve member
- No
- Federal Reserve district
- District 9, Minneapolis
- Fiduciary (trust) powers
- —
- Call Report form
- FFIEC 041
- Established
- April 8, 1974
- Domestic offices
- 7 FDIC institution directory, current count
- Employees (FTE)
- 40
- Domestic deposits
- $223.9M
- Allowance for credit losses
- $2.1M
- Net charge-offs (YTD)
- -$650K
- Average total assets
- $250.8M
- Average total loans
- $154.0M
- Average interest-bearing deposits
- $190.5M
- Tax status
- Subchapter S
- Ownership
- Stock
- Community bank
- Yes
- FDIC-insured since
- April 8, 1974
- FDIC Cert
- 21525
- Fed RSSD
- 914853
- Website
- WWW.CORNERSTONESTATEBANK.COM →
- Parent Holding Company
- CORNERSTONE BANCORPORATION, INC. (RSSD 1125423)
Profitability
Q2 annualizedBalance Sheet
Income Statement
Operating & Funding
Ratios tagged annualized use the Q2 income alone. The UBPR and FDIC annualize the year to date instead. FDIC BankFind divides by the average of quarter-end total assets, the UBPR by RC-K average assets. The YTD margin is the UBPR's tax-equivalent figure over its own average earning assets; FDIC BankFind's margin is not tax-equivalent. As a community bank leverage ratio filer, Cornerstone State Bank reports no risk-based capital ratios; its Tier 1 leverage ratio applies. How we compute these figures
Quarterly trends
Cornerstone State Bank's total assets moved between a low of $221.1M (Q3 2023) and a high of $247.0M (Q2 2026) from Q3 2023 to Q2 2026, and it earned a profit in all 12 quarters. The line under each chart compares Q2 2026 with Q2 2025. How these charts are built
$247.0M total assets against $235.4M; $227.0M total liabilities against $219.1M.
$150.3M net loans and leases against $145.6M; $223.9M total deposits against $214.0M.
$75.6M securities against $66.4M; $11.4M cash and balances due against $13.5M.
$3.2M total interest income against $2.7M; $904K total interest expense against $995K.
$2.3M net interest income against $1.7M.
$336K total noninterest income against $347K; $1.6M total noninterest expense against $1.5M.
$20K provision for credit losses against $316K.
$1.0M net income against $206K.
1.62% return on assets against 0.34%; 3.86% net interest margin against 2.94%.
10.60% tier 1 leverage ratio against 10.07%.
Inside the full Cornerstone State Bank terminal
21 quarters of trends · 8 tabs · peer percentiles · watchlist alerts
Unlock this bank, freeCornerstone State Bank rankings
Its closest position to the top of a national ranking is 1,055 of 3,611, for ROA; its furthest is 2,721 of 4,196, for total assets.
Quarterly trend: last 8 quarters
From Q3 2024 to Q2 2026, its return on assets ran from 0.34% (Q2 2025) to 1.62% (Q2 2026) and its net interest margin ran from 2.37% (Q3 2024) to 3.86% (Q2 2026).
| Quarter | Leverage | ROA | NPL | Texas | NIM |
|---|---|---|---|---|---|
| Q2 2026 | 10.60% | 1.62% | 0.80% | 5.53% | 3.86% |
| Q1 2026 | 10.34% | 1.28% | 0.48% | 3.76% | 3.34% |
| Q4 2025 | 10.32% | 1.11% | 0.48% | 3.64% | 3.15% |
| Q3 2025 | 10.28% | 1.18% | 0.44% | 3.39% | 2.97% |
| Q2 2025 | 10.07% | 0.34% | 0.44% | 3.69% | 2.94% |
| Q1 2025 | 9.97% | 0.59% | 0.96% | 8.67% | 2.73% |
| Q4 2024 | 10.09% | 1.08% | 0.88% | 8.34% | 2.66% |
| Q3 2024 | 9.99% | 0.56% | 0.12% | 0.96% | 2.37% |
Swipe the table sideways to see every column.
Branch Network
View all 7 branches → Branch count from the FDIC Summary of Deposits, June 30, 2026. The domestic office count above is the FDIC's current figure, so the two can differ.
| 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 |
Events & Regulatory History
Mergers, charter changes, enforcement actions, FDIC assistance, and (if applicable) failure events recorded against this institution. Click a year to see what else was happening across US banking that year.
| Date | Category | Event | Source |
|---|---|---|---|
| March 12, 2016 | Structure Change | Acquired Peoples State Bank of Madison Lake Charter Discontinued (Merger or Purchase & Assumption) for the acquired bank | FFIEC NIC |
| March 11, 2016 | Merger | Participated in Absorption/Consolidation/Merger | FDIC |
Sourced from the bank event history (FDIC, Federal Reserve NIC, OCC, and OTS). Showing the most recent 2 events.
Regulatory record
Facts as filed or published, not a rating.
- Deposit market share
- <0.1% of deposits in MN, rank 128 of 277 institutions
- Period: June 30, 2026. Source: FDIC Summary of Deposits.
- Mortgage lending (HMDA)
- 73 applications, 63 loans originated, $18.1M originated, across 4 states
- Period: Calendar year 2025. Source: FFIEC HMDA loan application register.
- SBA 7(a) lending
- 1 loans, $371K approved, $371K average. 0.00% of that year's loans have since been charged off
- Period: Federal fiscal year 2021 (October to September). Source: SBA 7(a) and 504 loan data (FOIA).
- Not on file
- Enforcement actions, Consumer complaints, CFPB enforcement, CRA examination rating. No record from these sources, which is not the same as a clean record. Sources
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Frequently asked about Cornerstone State Bank
What are Cornerstone State Bank's total assets?
As of the Q2 2026 filing, Cornerstone State Bank reported total assets of $247.0 million in its FFIEC call report.
Where is Cornerstone State Bank headquartered?
It is headquartered in Montgomery, MN, United States.
When was Cornerstone State Bank founded?
It was established in 1974, per the FDIC institution directory.
Is Cornerstone State Bank FDIC-insured?
Yes. It is an FDIC-insured commercial bank (FDIC Certificate #21525). Deposits are insured up to $250,000 per depositor, per insured bank, for each account ownership category, per FDIC rules.
Who regulates Cornerstone State Bank?
Cornerstone State Bank's primary federal regulator is the FDIC.
How many branches does Cornerstone State Bank operate?
It operates 7 domestic offices, per the FDIC institution directory. That count includes administrative and limited-service offices as well as full-service branches.
What is Cornerstone State Bank's Texas Ratio?
Its Texas Ratio is 5.53% in its Q2 2026 call report, within the healthy range (at or below 50%, the level at which problem assets reach half of the capital cushion). The Texas Ratio measures non-performing assets against the bank's capital and reserves.
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