Aurora, IL
Bank Old Second National Bank
Old Second National Bank is a federally insured bank based in Aurora, Illinois.
- Type
- Bank
- Charter
- National commercial bank (OCC-chartered)
- Primary regulator
- OCC
- Established
- November 21, 1887
- Headquarters
- Aurora, IL
- FDIC certificate #
- 3603
- Fed RSSD ID
- 936136
- Holding company
- Old Second Bcorp Inc
- Website
- www.oldsecond.com
$6.85B
Total assets Data as of Q1 2026
$5.6B
Total deposits Data as of Q1 2026
58
Branch locations Data as of Q1 2026
$27.6M
Net income Data as of Q1 2026
1.61%
Return on assets Data as of Q1 2026
Source: U.S. FDIC BankFind & NCUA 5300 Call Report (public data). Data sources · Data as of Q1 2026
Branches by state
Old Second National Bank operates 58 branch locations in Illinois. Select a state to drill down to its towns and individual branches.
Ownership
Old Second National Bank is owned by Old Second Bcorp Inc. See the full ownership & merger history.
Old Second National Bank financial summary
Other banks in Illinois
Federally insured banks headquartered in Illinois, by total assets.
- BMO Bank National Association $251.96B
- The Northern Trust Company $173.84B
- CIBC Bank USA $65.13B
- Busey Bank $18.01B
- Byline Bank $9.89B
- Wintrust Bank, National Association $9.28B
- Lake Forest Bank & Trust Company, National Association $9B
- First American Bank $8.22B
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