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Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Common equity tier 1 capital to risk weighted assets |  |
Actual | $ 207,597 | $ 179,853
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | $ 142,444 | $ 111,801
Common equity tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 9.29% | 9.25%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) | 6.375% | 5.75%
Total capital to risk weighted assets, Amount |  |
Actual at period end | $ 282,126 | $ 251,383
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | $ 220,648 | $ 179,837
Total capital to risk weighted assets, Ratio |  |
Risk-based capital ratio (as a percent) | 12.63% | 12.93%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) | 9.875% | 9.25%
Tier 1 capital to risk weighted assets, Amount |  |
Actual | $ 263,125 | $ 233,927
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | $ 175,960 | $ 140,978
Tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 11.78% | 12.03%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) | 7.875% | 7.25%
Tier 1 capital to average assets, Amount |  |
Actual | $ 263,125 | $ 233,927
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | $ 104,415 | $ 92,828
Tier 1 capital to average assets, Ratio |  |
Tier 1 capital leverage ratio (as a percent) | 10.08% | 10.08%
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 | $ 295,599 | $ 249,417
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | 141,791 | 111,347
Minimum Required to Be Well Capitalized | $ 144,571 | $ 125,870
Common equity tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 13.29% | 12.88%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) | 6.375% | 5.75%
Minimum Required to Be Well Capitalized (as a percent) | 6.50% | 6.50%
Total capital to risk weighted assets, Amount |  |
Actual at period end | $ 314,600 | $ 266,873
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | 219,637 | 179,142
Minimum Required to Be Well Capitalized | $ 222,417 | $ 193,667
Total capital to risk weighted assets, Ratio |  |
Risk-based capital ratio (as a percent) | 14.14% | 13.78%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) | 9.875% | 9.25%
Minimum Required to Be Well Capitalized (as a percent) | 10.00% | 10.00%
Tier 1 capital to risk weighted assets, Amount |  |
Actual | $ 295,599 | $ 249,417
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | 175,153 | 140,394
Minimum Required to Be Well Capitalized | $ 177,934 | $ 154,917
Tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 13.29% | 12.88%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) | 7.875% | 7.25%
Minimum Required to Be Well Capitalized (as a percent) | 8.00% | 8.00%
Tier 1 capital to average assets, Amount |  |
Actual | $ 295,599 | $ 249,417
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | 104,084 | 92,462
Minimum Required to Be Well Capitalized | $ 130,105 | $ 115,578
Tier 1 capital to average assets, Ratio |  |
Tier 1 capital leverage ratio (as a percent) | 11.36% | 10.79%
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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