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Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
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%