If you are shopping an SBA 7(a) or conventional commercial loan in Illinois, the bank you call first matters more than most borrowers think. A lender that already writes a lot of commercial credit and sits in your state is structurally likelier to say yes than a national name passing through. This page ranks the Illinois-headquartered banks doing the most commercial lending right now, using public Q1 2026 FFIEC call-report data. It is the open-book version of what the paid report does with far more inputs.
Chicago money looms over Illinois, but downstate community banks fund the grain, equipment, and small-manufacturer deals the big LaSalle Street names skip.
The 15 most active commercial lenders in Illinois
Ranked by commercial and industrial (C&I) loans outstanding, Q1 2026. Bank names link to the live BankingLens scorecard.
| # | Bank | City | Assets | C&I share | ROA | Fit notes |
|---|---|---|---|---|---|---|
| 1 | BMO Bank | Chicago | $252.0B | 31.2% | 1.16% | National-scale lender, heavy C&I concentration. |
| 2 | Cibc Bank USA | Chicago | $65.1B | 27.7% | 1.22% | Coast-to-coast balance sheet, an active C&I book. |
| 3 | Lake Forest Bank & Trust Company | Lake Forest | $9.0B | 59.9% | 1.74% | Mid-size regional, heavy C&I concentration. Top-decile returns. |
| 4 | Busey Bank | Champaign | $18.0B | 21.7% | 1.21% | Large regional lender, an active C&I book. CRE-heavy book. |
| 5 | Wintrust Bank | Chicago | $9.3B | 35.1% | 1.98% | Mid-size regional, heavy C&I concentration. Top-decile returns. |
| 6 | Byline Bank | Chicago | $9.9B | 31.1% | 1.64% | Regional commercial bank, heavy C&I concentration. Top-decile returns. |
| 7 | Northbrook Bank & Trust Company | Northbrook | $6.8B | 48.9% | 1.32% | Mid-size regional, heavy C&I concentration. Built for commercial deals. |
| 8 | Hinsdale Bank & Trust Company | Hinsdale | $6.5B | 38.1% | 1.44% | Regional commercial bank, heavy C&I concentration. Built for commercial deals. |
| 9 | Barrington Bank & Trust Company | Barrington | $4.9B | 42.3% | 1.18% | Mid-size regional, heavy C&I concentration. Built for commercial deals. |
| 10 | Wheaton Bank & Trust Company | Wheaton | $4.5B | 45.8% | 1.56% | Regional commercial bank, heavy C&I concentration. Top-decile returns. |
| 11 | First Mid Bank & Trust | Mattoon | $8.2B | 22.8% | 1.20% | Mid-size regional, an active C&I book. CRE-heavy book. |
| 12 | St. Charles Bank & Trust Company | Saint Charles | $3.5B | 41.0% | 1.36% | Regional commercial bank, heavy C&I concentration. Built for commercial deals. |
| 13 | Old Second National Bank | Aurora | $6.8B | 21.0% | 1.61% | Mid-size regional, an active C&I book. Top-decile returns. |
| 14 | Old Plank Trail Community Bank | New Lenox | $3.3B | 44.8% | 1.28% | Regional commercial bank, heavy C&I concentration. Built for commercial deals. |
| 15 | Village Bank & Trust | Arlington Heights | $3.5B | 38.8% | 2.28% | Mid-size regional, heavy C&I concentration. Top-decile returns. |
Assets and ratios are Q1 2026 FFIEC call-report figures. ROA is annualized return on assets. A bank's headquarters city is shown; many lend statewide and beyond.
C&I lending muscle, ranked
Commercial and industrial loans outstanding for the top 10 Illinois-HQ lenders, Q1 2026. This is the single number our ranking leans on hardest.
How we ranked these
Three steps, all of them transparent. First, we took every bank headquartered in Illinois. Second, we kept only banks whose commercial and industrial (C&I) loans are at least 10 percent of the loan book (a bank that is 90 percent home mortgages is not your SBA lender, regardless of size). Of the qualifying banks, 180 cleared that bar. Third, we ranked them by C&I loan dollars outstanding, which already blends balance-sheet size with how committed a bank is to commercial credit, and kept the top 15.
This is an honest, simplified proxy. It does not see a bank's actual SBA 7(a) origination volume (that lives in SBA FOIA data, not the call report), its appetite for your industry, or whether it funded forty SBA loans last quarter or zero. The $49 Borrower Assist report folds all of that in and ranks against your specific deal, not just your state. That is the part worth paying for.
What Illinois looks like for a borrower
Chicago money looms over Illinois, but downstate community banks fund the grain, equipment, and small-manufacturer deals the big LaSalle Street names skip.
The state's banking base totals $760.9B in assets across 329 charters, topped by BMO Bank (Chicago) at $252.0B. Commercial appetite varies widely; the median Illinois bank runs a 10.9% C&I share, and BMO Bank leads on raw C&I dollars ($43.7B).
None of that tells you which of these banks will fund your specific deal. A $400,000 restaurant acquisition and a $4M owner-occupied warehouse purchase have different optimal lender lists even in the same state, and the ranking above does not split by loan size, industry, or collateral. Treat it as your starting shortlist, not your final answer.
How to use this list
- Start with the bank near you that has the strongest commercial profile, not just the closest branch. A lender with a real C&I book understands your deal faster.
- Ask for the SBA or commercial lending group directly. The general line routes business deals slowly.
- Have a one-page summary ready: use of funds, cash flow, collateral, owner credit, timeline. Banks decide whether to engage in the first ninety seconds.
- Run two banks in parallel, not five. Two real conversations close a loan; five waste everyone's time.
Hero photo: American farmland by benjamin lehman on Unsplash, used here as a regional editorial image for Illinois.