This comparison uses public regulatory filings and TFS methodology. It evaluates financial condition—not checking rates, account fees, service quality, or which institution is universally “best.”
Bank
Northbrook, IL
Health score
81.0
Total assets
$6.4B
Bank
Aurora, IL
Health score
87.4
Total assets
$6.9B
Answer first
Northbrook Bank and Trust Company, National Association leads on lending quality; Old Second National Bank leads on financial health and capitalization and profitability and growth. Those category leads describe current regulatory metrics only and do not establish a universal product or service winner.
Capital and asset-quality definitions are directly comparable for this pair.
Category leaders
Financial health
Old Second National Bank
Higher TFS health score
Capitalization
Old Second National Bank
Higher comparable capital ratio
Profitability
Old Second National Bank
Higher return on assets
Lending quality
Northbrook Bank and Trust Company, National Association
Lower problem-loan measure
Growth
Old Second National Bank
Higher year-over-year asset growth
Same-source detail
Winner markers appear only where the metric definitions are comparable and both values are available.
| Metric | Northbrook Bank and Trust Company, National Association | Old Second National Bank |
|---|---|---|
| TFS health score | 81.0/100 | 87.4/100Leads |
| Total assets | $6.4B | $6.9B |
| Total deposits / shares | $5.4B | $5.5B |
| Tier 1 capital ratio | 9.38% | 12.05%Leads |
| Return on assets | 1.42% | 1.69%Leads |
| Return on equity | 17.31% |
Northbrook Bank and Trust Company, National Association
7 branches
Old Second National Bank
59 branches
Both institutions report branches in 1 state: IL.
Northbrook Bank and Trust Company, National Association
Unavailable
Old Second National Bank
Unavailable
Counts use an explicitly reviewed CFPB-company-to-regulatory-ID mapping and the same complete 12-month window. Parent-company attribution can include complaints involving affiliates. Lower complaint volume is context—not proof of better service or less consumer harm.
Northbrook Bank and Trust Company, National Association
0 in TFS registry
Old Second National Bank
0 in TFS registry
Institution-level actions come from TFS's exact regulatory-ID registry and are shown as factual context only. They do not affect category winners or the TFS Financial Health Grade. A zero means no action is currently published in this curated registry—not proof that none exists.
Quarterly history
| Quarter | Northbrook Bank and Trust Company, National Association score | Northbrook Bank and Trust Company, National Association ROA | Old Second National Bank score | Old Second National Bank ROA |
|---|---|---|---|---|
| 2024-Q3 | — | 1.28% | — | 1.68% |
| 2024-Q4 | — | 1.28% | — | 1.63% |
| 2025-Q1 | — | 1.51% | — | 1.54% |
| 2025-Q2 | — | 1.43% | — | 1.61% |
| 2025-Q3 | — | 1.40% | — | 1.32% |
| 2025-Q4 | — | 1.50% | — | 1.46% |
| 2026-Q1 |
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Coverage boundaries
Related comparisons
Financial data comes from FDIC BankFind Suite or NCUA Call Reports as labeled. TFS Health Grades are an editorial assessment, not an official government rating or financial advice. Arbitrary comparison pairs are available dynamically but remain noindex unless curated for data completeness and user value.
| 12.59% |
| Non-performing loans | 0.27%Leads | 1.08% |
| Net charge-offs | 0.12%Leads | 0.73% |
| Efficiency ratio | 29.17%Leads | 49.49% |
| Loan-to-deposit ratio | 82.72% | 94.71% |
| Asset growth (YoY) | 11.49% | 20.39%Leads |
| Deposit / share growth (YoY) | 11.61% | 12.28%Leads |
| Branches | 7 | 59 |
| Published CFPB complaints per $1B deposits (12 months)verified mappings only | — | — |
| 72.4/100 |
| 1.32% |
| 86.6/100 |
| 1.61% |
| 2026-Q2 | 81.0/100 | 1.42% | 87.4/100 | 1.69% |