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Junior Subordinated Debentures - Issuance (Details) - USD ($)
$ in Thousands
 1 Months Ended 6 Months Ended 9 Months Ended
Apr. 30, 2007
Jun. 15, 2017
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 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%    
Cash distribution, floating rate base     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)     4.17%   3.77%
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