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Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Common equity tier 1 capital to risk weighted assets    
Actual $ 153,585 $ 154,537
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 104,883 $ 90,411
Common equity tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 8.42% 8.76%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent) 5.75% 5.125%
Total capital to risk weighted assets, Amount    
Actual at period end $ 220,859 $ 216,768
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 168,699 $ 152,126
Total capital to risk weighted assets, Ratio    
Risk-based capital ratio (as a percent) 12.11% 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 $ 197,997 $ 191,987
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 132,180 $ 116,904
Tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 10.86% 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 $ 197,997 $ 191,987
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 89,591 $ 86,287
Tier 1 capital to average assets, Ratio    
Tier 1 capital leverage ratio (as a percent) 8.84% 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 $ 227,422 $ 221,153
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 104,950 90,456
Minimum Required to Be Well Capitalized $ 118,639 $ 114,724
Common equity tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 12.46% 12.53%
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% 6.50%
Total capital to risk weighted assets, Amount    
Actual at period end $ 243,158 $ 237,305
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 168,733 152,176
Minimum Required to Be Well Capitalized $ 182,414 $ 176,435
Total capital to risk weighted assets, Ratio    
Risk-based capital ratio (as a percent) 13.33% 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 $ 227,422 $ 221,153
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 132,328 116,930
Minimum Required to Be Well Capitalized $ 146,017 $ 141,199
Tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 12.46% 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 $ 227,422 $ 221,153
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 89,713 86,388
Minimum Required to Be Well Capitalized $ 112,141 $ 107,985
Tier 1 capital to average assets, Ratio    
Tier 1 capital leverage ratio (as a percent) 10.14% 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%