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Regulatory & Capital Matters (Details) | Dec. 31, 2015 | Dec. 31, 2014
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Regulatory & Capital Matters |  |
Tier 1 capital leverage ratio (as a percent) | 8.69% | 9.93%
Total capital ratio (as a percent) | 15.56% | 17.68%
Old Second National Bank |  |
Regulatory & Capital Matters |  |
Tier 1 capital leverage ratio (as a percent) | 9.94% | 12.02%
Total capital ratio (as a percent) | 15.23% | 18.73%

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