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Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Common equity tier 1 capital to risk weighted assets |  |
Actual | $ 189,150 | $ 179,853
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | $ 122,793 | $ 111,801
Common equity tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 9.82% | 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 | $ 261,536 | $ 251,383
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | $ 190,182 | $ 179,837
Total capital to risk weighted assets, Ratio |  |
Risk-based capital ratio (as a percent) | 13.58% | 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 | $ 243,353 | $ 233,927
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | $ 151,734 | $ 140,978
Tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 12.63% | 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 | $ 243,353 | $ 233,927
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | $ 93,239 | $ 92,828
Tier 1 capital to average assets, Ratio |  |
Tier 1 capital leverage ratio (as a percent) | 10.44% | 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 | $ 260,159 | $ 249,417
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | 122,309 | 111,347
Minimum Required to Be Well Capitalized | $ 124,707 | $ 125,870
Common equity tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 13.56% | 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 | $ 278,342 | $ 266,873
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | 189,430 | 179,142
Minimum Required to Be Well Capitalized | $ 191,828 | $ 193,667
Total capital to risk weighted assets, Ratio |  |
Risk-based capital ratio (as a percent) | 14.51% | 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 | $ 260,159 | $ 249,417
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | 151,088 | 140,394
Minimum Required to Be Well Capitalized | $ 153,486 | $ 154,917
Tier 1 capital to risk weighted assets, Ratio |  |
Actual (as a percent) | 13.56% | 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 | $ 260,159 | $ 249,417
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable | 92,997 | 92,462
Minimum Required to Be Well Capitalized | $ 116,246 | $ 115,578
Tier 1 capital to average assets, Ratio |  |
Tier 1 capital leverage ratio (as a percent) | 11.19% | 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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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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