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Parent Company Condensed Financial Information - Condensed Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets        
Other assets $ 22,776 $ 16,333    
Total assets 2,383,429 2,251,188    
Liabilities and Stockholders' Equity        
Junior subordinated debentures 57,639 57,591    
Senior Notes 44,058 43,998    
Other liabilities 13,539 11,889    
Stockholders' equity 200,350 175,210 $ 155,929 $ 194,163
Total liabilities and stockholders' equity 2,383,429 2,251,188    
Old Second Bancorp, Inc.        
Assets        
Noninterest bearing deposit with bank subsidiary 23,011 26,925    
Investment in subsidiaries 263,389 228,646    
Other assets 17,139 23,304    
Total assets 303,539 278,875    
Liabilities and Stockholders' Equity        
Junior subordinated debentures 57,639 57,591    
Senior Notes 44,058 43,998    
Other liabilities 1,492 2,076    
Stockholders' equity 200,350 175,210    
Total liabilities and stockholders' equity $ 303,539 $ 278,875