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Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Common equity tier 1 capital to risk weighted assets    
Actual $ 170,622 $ 154,537
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 110,482 $ 90,411
Common equity tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 8.88% 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 $ 239,269 $ 216,769
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 177,627 $ 152,126
Total capital to risk weighted assets, Ratio    
Risk-based capital ratio (as a percent) 12.46% 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 $ 221,579 $ 191,988
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 139,207 $ 116,904
Tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 11.54% 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 $ 221,579 $ 191,988
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable $ 91,467 $ 86,287
Tier 1 capital to average assets, Ratio    
Tier 1 capital leverage ratio (as a percent) 9.69% 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 $ 243,109 $ 221,153
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 110,330 90,456
Minimum Required to Be Well Capitalized $ 124,720 $ 114,724
Common equity tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 12.67% 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 $ 259,569 $ 237,306
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 177,590 152,176
Minimum Required to Be Well Capitalized $ 191,989 $ 176,436
Total capital to risk weighted assets, Ratio    
Risk-based capital ratio (as a percent) 13.52% 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 $ 243,109 $ 221,153
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 139,111 116,930
Minimum Required to Be Well Capitalized $ 153,502 $ 141,199
Tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 12.67% 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 $ 243,109 $ 221,153
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable 91,480 86,388
Minimum Required to Be Well Capitalized $ 114,350 $ 107,985
Tier 1 capital to average assets, Ratio    
Tier 1 capital leverage ratio (as a percent) 10.63% 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%