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Parent Company Condensed Financial Information - Condensed Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Expenses      
Junior subordinated debentures $ 3,716 $ 4,002 $ 4,334
Senior notes 2,688 2,689 112
Subordinated debt     949
Income (loss) before income taxes and equity in undistributed net income of subsidiaries 43,936 34,302 24,504
Income tax benefit 9,924 19,164 8,820
Net income available to common stockholders 34,012 15,138 15,684
Old Second Bancorp, Inc.      
Operating Income      
Cash dividends received from subsidiaries 30,000    
Other income 106 114 130
Total operating income 30,106 114 130
Operating Expenses      
Junior subordinated debentures 3,716 4,002 4,334
Senior notes 2,688 2,689 112
Subordinated debt     949
Other interest expense 98   8
Other expenses 4,208 2,639 1,975
Total operating expense 10,710 9,330 7,378
Income (loss) before income taxes and equity in undistributed net income of subsidiaries 19,396 (9,216) (7,248)
Income tax benefit (3,355) (16) (2,909)
Income (loss) before equity in undistributed net income of subsidiaries 22,751 (9,200) (4,339)
Equity in undistributed net income of subsidiaries 11,261 24,338 20,023
Net income available to common stockholders $ 34,012 $ 15,138 $ 15,684