Old Second National Bank has been serving Illinois communities since 1887. With $5.76 billion in assets and 59 branches across Illinois, Old Second offers comprehensive personal and business banking services. This guide covers everything you need to access your Old Second accounts online, through the mobile app, or by contacting customer support.
Quick Facts: Old Second National Bank
| Founded | November 21, 1887 |
| Headquarters | Aurora, Illinois |
| Total Assets | $5.76 billion |
| Branches | 59 locations in Illinois |
| Ranking | 15th largest bank in Illinois |
| Stock Symbol | NASDAQ: OSBC |
| Routing Number | 071900760 |
| FDIC Insured | Yes (Certificate #3603) |
How to Log In to Old Second Online Banking
Personal Banking Login
- Visit oldsecond.com
- Click “Account Login” in the top navigation
- Select “O2 Digital Banking”
- Enter your User ID and Password
- Click “Log In” to access your accounts
Direct login: digital.oldsecond.com
Business Banking Login
- Go to oldsecond.com
- Click “Account Login”
- Select “Corporate O2 Digital Banking”
- Enter your corporate credentials
- Complete any additional security verification
Direct login: corporateo2.oldsecond.com
Mobile App Login
- Download “O2 Digital Banking” from App Store or Google Play
- Open the app
- Enter the same User ID and Password you use online
- Set up fingerprint or Face ID for faster access
- Create a 4-digit PIN as backup
O2 Digital Banking Features
Old Second’s O2 Digital Banking platform is free for all customers and provides comprehensive account management:
- View Transactions – Check real-time account activity and transaction history
- Transfer Funds – Move money between Old Second accounts or to external accounts
- Mobile Deposit – Deposit checks by taking a photo with your smartphone
- Bill Pay – Schedule one-time or recurring payments to billers
- View Statements – Access and download monthly statements
- Stop Payments – Place stop payments on checks
- Card Controls – Turn your debit card on/off and set spending limits
- Alerts – Set notifications for low balances, large transactions, and more
- Add Tags & Notes – Organize transactions with custom tags and receipt photos
- Find Locations – Locate nearby branches and ATMs
O2 Digital Banking Mobile App
The O2 Digital Banking app brings your Old Second accounts to your smartphone or tablet:
| App Name | O2 Digital Banking |
| iOS | Available on App Store |
| Android | Available on Google Play |
| Rating | 3.3/5 (150+ reviews) |
| Security | Fingerprint, Face ID, 4-digit PIN |
| Cost | Free |
Note: You must be enrolled in O2 Digital Banking online before using the mobile app. Use the same login credentials for both platforms.
Troubleshooting Login Issues
Forgot Password?
- Click “Forgot Password” on the login page
- Enter your User ID and email address
- Check your email for a password reset link
- Create a new password following the security requirements
Forgot User ID?
- Click “Forgot User ID” on the login page
- Enter your email address on file
- Your User ID will be sent to your registered email
Account Locked?
After multiple failed login attempts, your account may be temporarily locked for security. Wait 30 minutes and try again, or contact customer support at 1-877-866-0202.
Security Tips
Keep your Old Second accounts secure:
- Never share your login credentials with anyone
- Create a strong password with letters, numbers, and special characters
- Enable account alerts for unusual activity
- Log out completely when using shared computers
- Use fingerprint or Face ID on mobile for added security
- Report suspicious emails claiming to be from Old Second
- Old Second will never ask for your full password by phone or email
Contact Old Second Bank
| Customer Service | 1-877-866-0202 |
| Lost/Stolen Card (24/7) | 1-800-754-4128 |
| Website | oldsecond.com |
| Headquarters | 37 S River St, Aurora, IL 60506 |
| Routing Number | 071900760 |
Branch Hours (most locations):
Monday – Friday: 9:00 AM – 5:30 PM
Saturday: 9:00 AM – 1:00 PM
Sunday: Closed
About Old Second National Bank
Old Second National Bank has deep roots in Illinois banking, with a history spanning nearly 140 years:
- 1887 – Founded as The Old Second National Bank of Aurora on November 21, 1887
- 1981 – Old Second Bancorp established as the bank holding company
- Historic Building – The original Old Second National Bank building in Aurora was designed by George Grant Elmslie in the Prairie School style, representing significant architectural heritage
- 2024 – Acquired five FMB branches in Illinois (December)
- 2026 – Announced merger agreement with Bancorp Financial, Inc. (February)
- Today – Operates 59 branches across Illinois with 891 employees, ranked 15th largest bank in the state
Old Second offers comprehensive banking services including personal checking and savings accounts, mortgages, home equity loans, auto loans, business banking, commercial lending, and wealth management services.
Customer Reviews
Old Second National Bank receives mixed reviews from customers:
- SmartAsset: 3.8/5 stars – “Decent bank with room for improvement”
- Yelp: 3.1/5 stars from 17 reviews
- BBB: Accredited since September 2022
- Health Rating: A+ (DepositAccounts)
Positive reviews highlight personalized service at branches. Some long-term customers have noted changes in customer focus over the years. The bank receives an “excellent” consumer satisfaction rating from the CFPB based on relatively few complaints.
Frequently Asked Questions
How do I enroll in O2 Digital Banking?
Visit oldsecond.com and click “Enroll” on the login page. You’ll need your account number, Social Security number, and email address to complete enrollment.
Is Old Second’s mobile app free?
Yes, the O2 Digital Banking app is free to download and use. Standard data rates from your mobile carrier may apply.
What is Old Second’s routing number?
Old Second’s primary routing number is 071900760. You can also find this on the bottom left of your checks.
Can I deposit checks through the mobile app?
Yes, the O2 Digital Banking app includes mobile check deposit. Simply take photos of the front and back of your endorsed check.
How do I report a lost or stolen debit card?
Call the 24-hour lost card hotline at 1-800-754-4128 immediately. You can also temporarily disable your card through O2 Digital Banking.
Does Old Second have a business banking portal?
Yes, Corporate O2 Digital Banking offers enhanced features for business customers including treasury management, positive pay, and multi-user access with role-based permissions.
How many branches does Old Second have?
Old Second operates 59 branches across Illinois. Use the branch locator on oldsecond.com to find the nearest location.
Is Old Second Bank FDIC insured?
Yes, Old Second National Bank is FDIC insured (Certificate #3603). Deposits are insured up to $250,000 per depositor, per account category.
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Last updated: January 2026
Last Updated on January 4, 2026
URL: https://log-in.me/oldsecondbancorp-aurora-unitedstates/