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Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Common equity tier 1 capital to risk weighted assets |  |
Actual | $ 153,585 | $ 154,537
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | $ 104,883 | $ 90,411
Common equity tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 8.42% | 8.76%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) | 5.75% | 5.125%
Total capital to risk weighted assets, Amount |  |
Actual at period end | $ 220,859 | $ 216,768
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | $ 168,699 | $ 152,126
Total capital to risk weighted assets, Ratio |  |
Risk-based capital ratio (as a percent) | 12.11% | 12.29%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) | 9.25% | 8.625%
Tier 1 capital to risk weighted assets, Amount |  |
Actual | $ 197,997 | $ 191,987
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | $ 132,180 | $ 116,904
Tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 10.86% | 10.88%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) | 7.25% | 6.625%
Tier 1 capital to average assets, Amount |  |
Actual | $ 197,997 | $ 191,987
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | $ 89,591 | $ 86,287
Tier 1 capital to average assets, Ratio |  |
Tier 1 capital leverage ratio (as a percent) | 8.84% | 8.90%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) | 4.00% | 4.00%
Old Second National Bank |  |
Common equity tier 1 capital to risk weighted assets |  |
Actual | $ 227,422 | $ 221,153
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | 104,950 | 90,456
Minimum Required to Be Well Capitalized | $ 118,639 | $ 114,724
Common equity tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 12.46% | 12.53%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) | 5.75% | 5.125%
Minimum Required to Be Well Capitalized (as a percent) | 6.50% | 6.50%
Total capital to risk weighted assets, Amount |  |
Actual at period end | $ 243,158 | $ 237,305
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | 168,733 | 152,176
Minimum Required to Be Well Capitalized | $ 182,414 | $ 176,435
Total capital to risk weighted assets, Ratio |  |
Risk-based capital ratio (as a percent) | 13.33% | 13.45%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) | 9.25% | 8.625%
Minimum Required to Be Well Capitalized (as a percent) | 10.00% | 10.00%
Tier 1 capital to risk weighted assets, Amount |  |
Actual | $ 227,422 | $ 221,153
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | 132,328 | 116,930
Minimum Required to Be Well Capitalized | $ 146,017 | $ 141,199
Tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 12.46% | 12.53%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) | 7.25% | 6.625%
Minimum Required to Be Well Capitalized (as a percent) | 8.00% | 8.00%
Tier 1 capital to average assets, Amount |  |
Actual | $ 227,422 | $ 221,153
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | 89,713 | 86,388
Minimum Required to Be Well Capitalized | $ 112,141 | $ 107,985
Tier 1 capital to average assets, Ratio |  |
Tier 1 capital leverage ratio (as a percent) | 10.14% | 10.24%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) | 4.00% | 4.00%
Minimum Required to Be Well Capitalized (as a percent) | 5.00% | 5.00%

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