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Regulatory & Capital Matters (Details) | Dec. 31, 2016 | Dec. 31, 2015
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Regulatory & Capital Matters |  |
Tier 1 capital leverage ratio (as a percent) | 8.90% | 8.69%
Risk-based capital ratio (as a percent) | 12.29% | 15.56%
Old Second National Bank |  |
Regulatory & Capital Matters |  |
Tier 1 capital leverage ratio (as a percent) | 10.24% | 9.94%
Risk-based capital ratio (as a percent) | 13.45% | 15.23%
Old Second National Bank | Minimum |  |
Regulatory & Capital Matters |  |
Tier 1 capital leverage ratio (as a percent) | 8.00% |
Risk-based capital ratio (as a percent) | 12.00% |

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