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Junior Subordinated Debentures - Issuance (Details) - USD ($)
$ in Thousands
 1 Months Ended 6 Months Ended 7 Months Ended 12 Months Ended
Jun. 15, 2017
Apr. 30, 2007
Jun. 15, 2017
Dec. 31, 2017
Dec. 31, 2024
Dec. 31, 2023
Junior subordinated debentures            
Junior subordinated debentures         $ 25,773 $ 25,773
Old Second Capital Trust II            
Junior subordinated debentures            
Proceeds from sale of cumulative trust preferred securities   $ 25,000        
Maturity Period         30 years  
Cash distribution fixed rate of trust preferred securities (as a percent)     6.77%      
Basis points added to cash distribution floating rate base (as a percent) 1.50%     1.50%    
Cash distribution, floating rate base three-month       three-month SOFR  
Amortization period         30 years  
Old Second Capital Trust II | Debt Instrument, Redemption, Period One            
Junior subordinated debentures            
Interest rate (as a percent)         4.37% 4.25%
Junior Subordinated Debentures            
Junior subordinated debentures            
Junior Subordinated Debentures issuance cost         $ 1,000 $ 1,000
Junior Subordinated Debentures | Old Second Capital Trust II            
Junior subordinated debentures            
Junior subordinated debentures         $ 25,800