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Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Common equity tier 1 capital to risk weighted assets    
Actual $ 179,853 $ 154,537
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 111,801 $ 90,411
Common equity tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 9.25% 8.76%
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%
Total capital to risk weighted assets, Amount    
Actual at period end $ 251,383 $ 216,769
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 179,837 $ 152,126
Total capital to risk weighted assets, Ratio    
Risk-based capital ratio (as a percent) 12.93% 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 $ 233,927 $ 191,988
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 140,978 $ 116,904
Tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 12.03% 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 $ 233,927 $ 191,988
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 92,828 $ 86,287
Tier 1 capital to average assets, Ratio    
Tier 1 capital leverage ratio (as a percent) 10.08% 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 $ 249,417 $ 221,153
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 111,347 90,456
Minimum Required to Be Well Capitalized $ 125,870 $ 114,724
Common equity tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 12.88% 12.53%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 5.75%  
Minimum Required to Be Well Capitalized (as a percent) 6.50%  
Total capital to risk weighted assets, Amount    
Actual at period end $ 266,873 $ 237,306
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 179,142 152,176
Minimum Required to Be Well Capitalized $ 193,667 $ 176,436
Total capital to risk weighted assets, Ratio    
Risk-based capital ratio (as a percent) 13.78% 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 $ 249,417 $ 221,153
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 140,394 116,930
Minimum Required to Be Well Capitalized $ 154,917 $ 141,199
Tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 12.88% 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 $ 249,417 $ 221,153
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 92,462 86,388
Minimum Required to Be Well Capitalized $ 115,578 $ 107,985
Tier 1 capital to average assets, Ratio    
Tier 1 capital leverage ratio (as a percent) 10.79% 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%