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Parent Company Condensed Financial Information - Condensed Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Expenses      
Junior subordinated debentures interest expense $ 4,287 $ 4,919 $ 5,298
Subordinated debt interest expense 814 792 811
Income before income taxes 24,361 15,897 11,843
Income tax benefit 8,976 5,761 (70,242)
Net income 15,385 10,136 82,085
Dividends waived upon preferred stock redemption   (5,433)  
Gain on preferred stock redemption   (1,348)  
Net income available to common stockholders 13,512 11,855 76,827
Old Second Bancorp, Inc.      
Operating Income      
Cash dividends received from subsidiaries 82,777    
Other income 131 231 772
Total operating income 82,908 231 772
Operating Expenses      
Junior subordinated debentures interest expense 4,287 4,919 5,298
Subordinated debt interest expense 814 792 811
Other interest expense 7 16 16
Other expenses 1,978 1,045 1,006
Total operating expense 7,086 6,772 7,131
Income before income taxes 75,822 (6,541) (6,359)
Income tax benefit (2,771) (2,305) (17,133)
Income (loss) before equity in undistributed net income of subsidiaries 78,593 (4,236) 10,774
Equity in undistributed net income of subsidiaries (63,208) 14,372 71,311
Net income 15,385 10,136 82,085
Preferred stock dividends and accretion of discount 1,873 5,062 5,258
Dividends waived upon preferred stock redemption   (5,433)  
Gain on preferred stock redemption   (1,348)  
Net income available to common stockholders $ 13,512 $ 11,855 $ 76,827