Old Second National Bank
Aurora, IL — National Bank
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Net Interest Margin Over Time
| Net Interest Margin | Old Second National Bank | All Insured Commercial Banks in Illinois |
| 12-31-2016 | 3.559 | 3.499 |
| 09-30-2016 | 3.472 | 3.502 |
| 06-30-2016 | 3.465 | 3.495 |
| 03-31-2016 | 3.48 | 3.487 |
| 12-31-2015 | 3.481 | 3.487 |
| 09-30-2015 | 3.491 | 3.478 |
| 06-30-2015 | 3.484 | 3.453 |
| 03-31-2015 | 3.473 | 3.418 |
| 12-31-2014 | 3.486 | 3.485 |
| 09-30-2014 | 3.438 | 3.46 |
| 06-30-2014 | 3.385 | 3.443 |
| 03-31-2014 | 3.415 | 3.416 |
| 12-31-2013 | 3.476 | 3.428 |
| 09-30-2013 | 3.474 | 3.4 |
| 06-30-2013 | 3.413 | 3.374 |
| 03-31-2013 | 3.45 | 3.361 |
| 12-31-2012 | 3.755 | 3.573 |
| 09-30-2012 | 3.837 | 3.585 |
| 06-30-2012 | 3.863 | 3.59 |
| 03-31-2012 | 3.763 | 3.604 |
| 12-31-2011 | 3.81 | 3.692 |
| 09-30-2011 | 3.83 | 3.686 |
| 06-30-2011 | 3.766 | 3.652 |
| 03-31-2011 | 3.594 | 3.614 |
| 12-31-2010 | 3.809 | 3.707 |
| 09-30-2010 | 3.816 | 3.712 |
| 06-30-2010 | 3.816 | 3.694 |
| 03-31-2010 | 3.887 | 3.664 |
| 12-31-2009 | 3.551 | 3.579 |
| 09-30-2009 | 3.45 | 3.56 |
| 06-30-2009 | 3.442 | 3.538 |
| 03-31-2009 | 3.523 | 3.54 |
| 12-31-2008 | 3.665 | 3.56 |
| 09-30-2008 | 3.617 | 3.558 |
| 06-30-2008 | 3.502 | 3.533 |
| 03-31-2008 | 3.363 | 3.519 |
| 12-31-2007 | 3.12 | 3.667 |
| 09-30-2007 | 3.107 | 3.677 |
| 06-30-2007 | 3.179 | 3.662 |
| 03-31-2007 | 3.161 | 3.626 |
| 12-31-2006 | 3.391 | 3.765 |
| 09-30-2006 | 3.358 | 3.793 |
| 06-30-2006 | 3.412 | 3.805 |
| 03-31-2006 | 3.455 | 3.781 |
| 12-31-2005 | 3.62 | 3.876 |
| 09-30-2005 | 3.608 | 3.884 |
| 06-30-2005 | 3.589 | 3.873 |
| 03-31-2005 | 3.592 | 3.831 |
| 12-31-2004 | 3.772 | 3.852 |
| 09-30-2004 | 3.798 | 3.831 |
| 06-30-2004 | 3.847 | 3.815 |
| 03-31-2004 | 3.899 | 3.814 |
| 12-31-2003 | 3.838 | 3.819 |
| 09-30-2003 | 3.782 | 3.828 |
| 06-30-2003 | 3.771 | 3.842 |
| 03-31-2003 | 3.716 | 3.863 |
| 12-31-2002 | 4.313 | 3.995 |