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