Flags
Threshold-based signals from the latest filing.
Minor
- ALLL Coverage (ALLL / Noncurrent) below 100%95.53%
Old Second National Bank
Aurora, IL
IDRSSD: 936136
Total Assets
$6.85B
Latest filing
Total Deposits
$5.60B
Latest filing
Net Interest Margin
5.19%
Profitability
Routing numbers
Primary routing transit numbers associated with this institution.
5 routesView all→
071001122AURORA, IL071900760AURORA, IL071916822AURORA, IL071923349AURORA, IL071925981AURORA, IL
Key People
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Locations
Main office and branches. Select to view on the map.
Main Office
Old Second National Bank
37 S River St
Aurora, IL 60506
Full Service - Brick and Mortar
Updated 05/01/2026Established 11/21/1887FDIC Certificate 2293
Branches (49 of 58)
Page 1 of 7Showing a subset of branches for faster page loads. This bank has 59 locations total.
| Name | Address | City / State |
|---|---|---|
| Old Second National Bank (Main) | 37 S River St | Aurora, IL |
| 9443 SOUTH ASHLAND AVENUE BRANCH | 9443 S Ashland Ave | Chicago, IL |
| FRANKFORT BRANCH | 20201 S La Grange Rd | Frankfort, IL |
| WSB VISA BUILDING LIMITED SERVICE BRANCH | 701 Westmore Meyers Rd | Lombard, IL |
| NORTH AURORA BRANCH | 200 John St | North Aurora, IL |
| FINLEY ROAD BRANCH | 2800 Finley Rd | Downers Grove, IL |
| CASS AVENUE BRANCH | 8001 Cass Ave | Darien, IL |
| STRATFORD SQUARE BRANCH | 355 W Army Trail Rd | Bloomingdale, IL |
Showing 7 of 49
Quarterly Trends
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Total Assets vs Total Liabilities
Loans & Leases vs Deposits
Interest Income vs Expense
Net Interest Income
Noninterest Expense vs Income
Net Income
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Watch Panel
Active Watch Signals across growth, allowance, nonperforming, and charge-off portfolios.
Growth
Balance-sheet growth signalsNo active Watch signals. Watch Engine runs quarterly after each FFIEC ingestion.
Allowance
ALLL coverage signalsNo active Watch signals. Watch Engine runs quarterly after each FFIEC ingestion.
Nonperforming
Noncurrent loan signalsNo active Watch signals. Watch Engine runs quarterly after each FFIEC ingestion.
Charge-off
Net charge-off signalsNo active Watch signals. Watch Engine runs quarterly after each FFIEC ingestion.
Institution Profile
| Institution Class | Commercial bank, national (federal) charter, Fed member, and supervised by the OCC |
| Primary Regulator | OCC |
| Established Date | 11/21/1887 |
| Community Bank | Yes |
| Ownership Type | Not Mutual |
| ZIP | 60506 |
| State and County Number | 17089 |
| Subchapter S Corporations | No |
| Trust Powers | Full Trust Powers Granted |
| Federal Reserve ID Number | 07 |
| Numeric code | 3 |
| Insured by FDIC | Institutions that are currently open and insured by the FDIC |
| Federal Reserve District | Chicago |
| Core Based Statistical Area Name | Chicago-Naperville-Elgin, IL-IN-WI |
Operational Info
| Number of Employees | 1,062 |
| Domestic Offices | 59 |
| Foreign Offices | 0 |
| US Offices | 0 |
| Directly owned by another bank (CERT) | No |
| Last Structure Change Effective Date | 07/01/2025 |
| Date of Deposit Insurance | 01/01/1934 |
| Primary Insurance Agency | DIF |
| Website | www.oldsecond.com |
| Data Updated | 05/01/2026 |
| CERT | 3603 |
| Office of The Comptroller District: | — |
| Office of Thrift Supervision Region | N/A |
Financial Summary
| Total Assets | $6.85B |
| Total Deposits | $5.60B |
| Total Liabilities | $5.92B |
| Total Equity Capital | $930.25M |
| Net Income | $27.64M |
| Net Loans and Leases | $5.12B |
| Assets Per Employee ($Millions) | $6.62M |
| Bank Premises and Fixed Assets | $93.41M |
| Cash and Balances due from Depository Institutions | $115.73M |
| Deposits Held in Domestic Offices | $5.60B |
Key Performance Ratios
| Return on Assets (ROA) | 1.61% |
| Return on Equity (ROE) | 12.05% |
| Net Interest Margin | 5.19% |
| Efficiency Ratio | 49.59% |
| Tier 1 Risk-Based Capital Ratio | 13.804% |
| Net Loans and Leases to Core Deposits | 0% |
| Credit Loss Provision to Assets | 0.55% |
| Cash Dividends to Net Income (YTD Only) | 0% |
| Equity Capital to Assets | 13.587% |
| Earning Assets to total Assets | 92.01% |
Income and Expense
| Total Interest Income | $98.33M |
| Total Noninterest Income | $12.73M |
| Total Interest Expense | $16.36M |
| Total Noninterest Expense | $48.14M |
| Net Interest Income | $81.97M |
| Pre-tax Net Operating Income | $37.07M |
| Provision for Credit Losses | $9.50M |
| Discontinued Operations (Extraordinary Gains - Net) | $0 |
Additional Financial Info
| Goodwill and Other Intangibles | $0 |
| All Other Assets | — |
| Other Real Estate Owned | $632.00k |
| Other borrowed funds | $214.84M |
| Federal Funds Sold & Reverse Repurchase Agreement | $0 |
| Federal Funds Purchased and Repurchased Agreement | $23.13M |
| All Other Liabilities | $77.64M |
| Total Liabilities and Capital | $6.85B |
Securities
| Securities | $1.11B |
| Available-for-sale debt securities | $1.11B |
| Equity securities with readily determinable fair values not held for trading | — |
| Held-to-maturity securities | $0 |
| Subordinated Debt | $0 |
| Trading Account Assets | $0 |
| Trading Liabilities | $0 |
Frequently Asked Questions
What are the total assets of Old Second National Bank?
$6.85B as of the latest filing.
How much are Old Second National Bank's total deposits?
$5.60B in total deposits.
Where is Old Second National Bank located?
Aurora, IL.
What is the Net Interest Margin?
5.19%.
How many domestic offices does it operate?
59.
When was it established?
11/21/1887.
What is the Return on Assets (ROA)?
1.61%.
How much are total loans and leases?
$5.12B (latest filing).
What is the total interest income (latest filing)?
$98.33M.