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Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Common equity tier 1 capital to risk weighted assets    
Actual $ 157,172 $ 151,410
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 75,422 $ 64,582
Common equity tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 10.68% 10.55%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 5.125% 4.50%
Total capital to risk weighted assets, Amount    
Actual at period end $ 226,785 $ 223,311
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 126,850 $ 114,813
Total capital to risk weighted assets, Ratio    
Risk-based capital ratio (as a percent) 15.42% 15.56%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 8.625% 8.00%
Tier 1 capital to risk weighted assets, Amount    
Actual $ 194,910 $ 176,625
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 97,455 $ 86,159
Tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 13.25% 12.30%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 6.625% 6.00%
Tier 1 capital to average assets, Amount    
Actual $ 194,910 $ 176,625
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 83,652 $ 81,300
Tier 1 capital to average assets, Ratio    
Tier 1 capital leverage ratio (as a percent) 9.32% 8.69%
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 $ 223,359 $ 202,158
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 75,211 64,519
Minimum Required to Be Well Capitalized $ 95,390 $ 93,193
Common equity tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 15.22% 14.10%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 5.125% 4.50%
Minimum Required to Be Well Capitalized (as a percent) 6.50% 6.50%
Total capital to risk weighted assets, Amount    
Actual at period end $ 238,337 $ 218,375
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 126,580 114,708
Minimum Required to Be Well Capitalized $ 146,759 $ 143,385
Total capital to risk weighted assets, Ratio    
Risk-based capital ratio (as a percent) 16.24% 15.23%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 8.625% 8.00%
Minimum Required to Be Well Capitalized (as a percent) 10.00% 10.00%
Tier 1 capital to risk weighted assets, Amount    
Actual $ 223,359 $ 202,158
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 97,224 86,025
Minimum Required to Be Well Capitalized $ 117,403 $ 114,700
Tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 15.22% 14.10%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 6.625% 6.00%
Minimum Required to Be Well Capitalized (as a percent) 8.00% 8.00%
Tier 1 capital to average assets, Amount    
Actual $ 223,359 $ 202,158
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 83,891 81,351
Minimum Required to Be Well Capitalized $ 104,863 $ 101,689
Tier 1 capital to average assets, Ratio    
Tier 1 capital leverage ratio (as a percent) 10.65% 9.94%
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%