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Junior Subordinated Debentures - Issuance (Details) - USD ($)
$ in Thousands
 1 Months Ended 6 Months Ended 7 Months Ended
Apr. 30, 2007
Jun. 30, 2024
Jun. 15, 2017
Dec. 31, 2017
Dec. 31, 2023
Jun. 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)   4.49%       4.37%
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