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Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Common equity tier 1 capital to risk weighted assets    
Actual $ 146,438  
Minimum Required for Capital Adequacy Purposes $ 64,227  
Common equity tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 10.26%  
Minimum Required for Capital Adequacy Purposes (as a percent) 4.50%  
Total capital to risk weighted assets, Amount    
Actual at period end $ 219,255 $ 240,566
Minimum Required for Capital Adequacy Purposes $ 114,195 $ 108,853
Total capital to risk weighted assets, Ratio    
Risk-based capital ratio (as a percent) 15.36% 17.68%
Minimum Required for Capital Adequacy Purposes (as a percent) 8.00% 8.00%
Tier 1 capital to risk weighted assets, Amount    
Actual $ 170,697 $ 196,499
Minimum Required for Capital Adequacy Purposes $ 85,634 $ 54,432
Tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 11.96% 14.44%
Minimum Required for Capital Adequacy Purposes (as a percent) 6.00% 4.00%
Tier 1 capital to average assets, Amount    
Actual $ 170,697 $ 196,499
Minimum Required for Capital Adequacy Purposes $ 80,708 $ 79,154
Tier 1 capital to average assets, Ratio    
Tier 1 capital leverage ratio (as a percent) 8.46% 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 $ 227,335  
Minimum Required for Capital Adequacy Purposes 64,179  
Minimum Required to Be Well Capitalized $ 92,702  
Common equity tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 15.94%  
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 $ 243,942 $ 254,897
Minimum Required for Capital Adequacy Purposes 114,125 108,872
Minimum Required to Be Well Capitalized $ 142,656 $ 136,090
Total capital to risk weighted assets, Ratio    
Risk-based capital ratio (as a percent) 17.10% 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 $ 227,335 $ 237,828
Minimum Required for Capital Adequacy Purposes 85,572 54,454
Minimum Required to Be Well Capitalized $ 114,095 $ 81,681
Tier 1 capital to risk weighted assets, Ratio    
Actual (as a percent) 15.94% 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 $ 227,335 $ 237,828
Minimum Required for Capital Adequacy Purposes 80,758 79,144
Minimum Required to Be Well Capitalized $ 100,948 $ 98,930
Tier 1 capital to average assets, Ratio    
Tier 1 capital leverage ratio (as a percent) 11.26% 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%