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Parent Company Condensed Financial Information - Condensed Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Expenses      
Junior subordinated debentures interest expense $ 4,002 $ 4,334 $ 4,287
Interest Expense Senor Notes 2,689 112  
Subordinated debt interest expense   949 814
Income before income taxes 34,302 24,504 24,361
Income tax benefit 19,164 8,820 8,976
Net income 15,138 15,684 15,385
Net income available to common stockholders 15,138 15,684 13,512
Old Second Bancorp, Inc.      
Operating Income      
Cash dividends received from subsidiaries     82,777
Other income 114 130 131
Total operating income 114 130 82,908
Operating Expenses      
Junior subordinated debentures interest expense 4,002 4,334 4,287
Interest Expense Senor Notes 2,689 112  
Subordinated debt interest expense   949 814
Other interest expense   8 7
Other expenses 2,639 1,975 1,978
Total operating expense 9,330 7,378 7,086
Income before income taxes (9,216) (7,248) 75,822
Income tax benefit (16) (2,909) (2,771)
Income (loss) before equity in undistributed net income of subsidiaries (9,200) (4,339) 78,593
Equity in undistributed net income of subsidiaries 24,338 20,023 (63,208)
Net income 15,138 15,684 15,385
Preferred stock dividends and accretion of discount     1,873
Net income available to common stockholders $ 15,138 $ 15,684 $ 13,512