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Old Second National Bank, History
The following are major historical events for Old Second National Bank, including mergers and acquisitions.
| 1887-11-21 | Institution established: Original name:The Old Second National Bank of Aurora | |
| 1997-06-12 | Acquired First State Bank of Maple Park (1812) in MAPLE PARK, IL | |
| 1999-01-01 | Acquired The Old Second Community Bank of North Aurora (20221) in NORTH AURORA, IL | |
| 1999-01-01 | Acquired The Old Second Community Bank of Aurora (22421) in AURORA, IL | |
| 2000-02-25 | Acquired Bank of Sugar Grove (21930) in SUGAR GROVE, IL | |
| 2007-07-01 | Changed name to Old Second National Bank | |
| 2007-07-01 | Acquired Old Second Bank-Kane County (5738) in ELBURN, IL | |
| 2007-07-01 | Acquired Old Second Bank-Yorkville (3757) in YORKVILLE, IL | |
| 2008-02-09 | Acquired Heritage Bank (17917) in FRANKFORT, IL | |
| 2018-04-20 | Acquired ABC Bank (11694) in CHICAGO, IL | |
| 2021-12-01 | Acquired West Suburban BankOld Second National Bank (18509) in LOMBARD, IL. |