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Regulatory & Capital Matters (Details) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 0 Months Ended 6 Months Ended
Apr. 21, 2014
Jun. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
May 15, 2014
Series B Stock
Apr. 28, 2014
Series B Stock
Apr. 15, 2014
Series B Stock
May 31, 2014
Series B Stock
Jun. 30, 2014
Series B Stock
Apr. 28, 2014
Series B Stock
Apr. 28, 2014
Series B Stock
Large private investor
Apr. 28, 2014
Series B Stock
Directors
Jun. 30, 2014
Bank of America credit facility, subordinated debt
Dec. 31, 2013
Bank of America credit facility, subordinated debt
Jun. 30, 2014
Junior subordinated debentures
item
Jun. 30, 2014
Junior subordinated debentures
Maximum
item
Jun. 30, 2014
Old Second National Bank
Dec. 31, 2013
Old Second National Bank
Jun. 30, 2014
Old Second National Bank
Minimum
Regulatory & Capital Matters                                      
Tier 1 capital leverage ratio, board-designated threshold                                     8.00%
Total Capital Ratio, board-designated threshold (as a percent)                                     12.00%
Tier One leverage ratio, basis point increase (as a percent)                                 0.31%    
Risk-based capital ratio, basis point increase (as a percent)                                 0.25%    
Proceeds from issuance of common stock     $ 64,395,000           $ 64,000,000                    
Total capital to risk weighted assets, Amount                                      
Actual at period end   233,167,000 233,167,000 191,139,000                         241,394,000 227,467,000  
Minimum Required for Capital Adequacy Purposes   105,625,000 105,625,000 100,865,000                         105,585,000 100,872,000  
Minimum Required to Be Well Capitalized                                 131,981,000 126,090,000  
Total capital to risk weighted assets, Ratio                                      
Risk-based capital ratio (as a percent)   17.66% 17.66% 15.16%                         18.29% 18.04%  
Minimum Required for Capital Adequacy Purposes (as a percent)   8.00% 8.00% 8.00%                         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   189,576,000 189,576,000 134,199,000                         224,812,000 211,568,000  
Minimum Required for Capital Adequacy Purposes   52,807,000 52,807,000 50,403,000                         52,804,000 50,433,000  
Minimum Required to Be Well Capitalized                                 79,206,000 75,650,000  
Tier 1 capital to risk weighted assets, Ratio                                      
Actual (as a percent)   14.36% 14.36% 10.65%                         17.03% 16.78%  
Minimum Required for Capital Adequacy Purposes (as a percent)   4.00% 4.00% 4.00%                         4.00% 4.00%  
Minimum Required to Be Well Capitalized (as a percent)                                 6.00% 6.00%  
Tier 1 capital to average assets, Amount                                      
Actual   189,576,000 189,576,000 134,199,000                         224,812,000 211,568,000  
Minimum Required for Capital Adequacy Purposes   79,738,000 79,738,000 77,126,000                         79,721,000 77,144,000  
Minimum Required to Be Well Capitalized                                 99,651,000 96,430,000  
Tier 1 capital to average assets, Ratio                                      
Tier 1 capital leverage ratio (as a percent)   9.51% 9.51% 6.96%                         11.28% 10.97%  
Minimum Required for Capital Adequacy Purposes (as a percent)   4.00% 4.00% 4.00%                         4.00% 4.00%  
Minimum Required to Be Well Capitalized (as a percent)                                 5.00% 5.00%  
Other regulatory capital information                                      
Subordinated debt   45,000,000 45,000,000 45,000,000                 45,000,000            
Debt obligation as a percent of Tier 2 regulatory capital                         60.00% 80.00%          
Trust preferred proceeds qualified as Tier 1 regulatory capital                         56,600,000 51,600,000          
Trust preferred proceeds qualified as Tier 2 regulatory capital                           5,000,000          
Dividend Restrictions and Deferrals                                      
Number of previous years retained profit considered for dividend payment     2 years                                
Junior subordinated debenture   58,378,000 58,378,000 58,378,000                     58,400,000        
Number of statutory business trusts that hold junior subordinated debentures                             2        
Number of quarterly periods for deferral of interest                               20      
Payments to indentured trustees 19,700,000 19,700,000                                  
Preferred stock dividend amount             15,800,000                        
Dividends paid     10,258,000   10,300,000     10,300,000                      
Shares redeemed (in shares)           25,669     25,669                    
Repurchase price percentage of liquidation value (as a percent)           94.75%     94.75%                    
Preferred stock, Liquidation value (in dollars per share)   $ 1,000 $ 1,000 $ 1,000           $ 947.50                  
Preferred Stock, Liquidation Preference Per Share   $ 1,000 $ 1,000 $ 1,000           $ 947.50                  
Payments for repurchase of preferred stock           24,300,000     24,300,000   22,900,000 1,400,000              
Benefit from reversal of dividends previously accrued or accumulated and waived by holders upon redemption   $ 5,433,000 $ 5,433,000           $ 5,400,000