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Parent Company Condensed Financial Information - Condensed Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets        
Other assets $ 23,473 $ 22,776    
Total assets 2,676,003 2,383,429    
Liabilities and Stockholders' Equity        
Other short-term borrowings 149,500 115,000    
Junior subordinated debentures 57,686 57,639    
Senior Notes 44,158 44,058    
Other liabilities 16,894 13,539    
Stockholders' equity 229,081 200,350 $ 175,210 $ 155,929
Total liabilities and stockholders' equity 2,676,003 2,383,429    
Old Second Bancorp, Inc.        
Assets        
Noninterest bearing deposit with bank subsidiary 9,039 23,011    
Investment in subsidiaries 315,252 263,389    
Other assets 12,997 17,139    
Total assets 337,288 303,539    
Liabilities and Stockholders' Equity        
Other short-term borrowings 4,000      
Junior subordinated debentures 57,686 57,639    
Senior Notes 44,158 44,058    
Other liabilities 2,363 1,492    
Stockholders' equity 229,081 200,350    
Total liabilities and stockholders' equity $ 337,288 $ 303,539