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Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Common equity tier 1 capital to risk weighted assets    
Actual $ 151,410  
Minimum Required for Capital Adequacy Purposes $ 64,582  
Common equity tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 10.55%  
Minimum Required for Capital Adequacy Purposes (as a percent) 4.50%  
Total capital to risk weighted assets, Amount    
Actual at period end $ 223,311 $ 240,566
Minimum Required for Capital Adequacy Purposes $ 114,813 $ 108,853
Total capital to risk weighted assets, Ratio    
Risk-based capital ratio (as a percent) 15.56% 17.68%
Minimum Required for Capital Adequacy Purposes (as a percent) 8.00% 8.00%
Tier 1 capital to risk weighted assets, Amount    
Actual $ 176,625 $ 196,499
Minimum Required for Capital Adequacy Purposes $ 86,159 $ 54,432
Tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 12.30% 14.44%
Minimum Required for Capital Adequacy Purposes (as a percent) 6.00% 4.00%
Tier 1 capital to average assets, Amount    
Actual $ 176,625 $ 196,499
Minimum Required for Capital Adequacy Purposes $ 81,300 $ 79,154
Tier 1 capital to average assets, Ratio    
Tier 1 capital leverage ratio (as a percent) 8.69% 9.93%
Minimum Required for Capital Adequacy Purposes (as a percent) 4.00% 4.00%
Old Second National Bank    
Common equity tier 1 capital to risk weighted assets    
Actual $ 202,158  
Minimum Required for Capital Adequacy Purposes 64,519  
Minimum Required to Be Well Capitalized $ 93,193  
Common equity tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 14.10%  
Minimum Required for Capital Adequacy Purposes (as a percent) 4.50%  
Minimum Required to Be Well Capitalized (as a percent) 6.50%  
Total capital to risk weighted assets, Amount    
Actual at period end $ 218,375 $ 254,897
Minimum Required for Capital Adequacy Purposes 114,708 108,872
Minimum Required to Be Well Capitalized $ 143,385 $ 136,090
Total capital to risk weighted assets, Ratio    
Risk-based capital ratio (as a percent) 15.23% 18.73%
Minimum Required for Capital Adequacy Purposes (as a percent) 8.00% 8.00%
Minimum Required to Be Well Capitalized (as a percent) 10.00% 10.00%
Tier 1 capital to risk weighted assets, Amount    
Actual $ 202,158 $ 237,828
Minimum Required for Capital Adequacy Purposes 86,025 54,454
Minimum Required to Be Well Capitalized $ 114,700 $ 81,681
Tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 14.10% 17.47%
Minimum Required for Capital Adequacy Purposes (as a percent) 6.00% 4.00%
Minimum Required to Be Well Capitalized (as a percent) 8.00% 6.00%
Tier 1 capital to average assets, Amount    
Actual $ 202,158 $ 237,828
Minimum Required for Capital Adequacy Purposes 81,351 79,144
Minimum Required to Be Well Capitalized $ 101,689 $ 98,930
Tier 1 capital to average assets, Ratio    
Tier 1 capital leverage ratio (as a percent) 9.94% 12.02%
Minimum Required for Capital Adequacy Purposes (as a percent) 4.00% 4.00%
Minimum Required to Be Well Capitalized (as a percent) 5.00% 5.00%