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Junior Subordinated Debentures - Issuance (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 7 Months Ended
Apr. 30, 2007
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 15, 2017
Dec. 31, 2017
Dec. 31, 2022
Junior subordinated debentures              
Junior subordinated debentures   $ 25,773   $ 25,773     $ 25,773
Old Second Capital Trust II [Member]              
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 LIBOR      
Amortization period       30 years      
Old Second Capital Trust II [Member] | Debt Instrument, Redemption, Period One [Member]              
Junior subordinated debentures              
Cash distribution rate of trust preferred securities (as a percent)   4.37% 4.42%        
Junior subordinated debentures              
Junior subordinated debentures              
Junior Subordinated Debentures issuance cost   $ 1,000   $ 1,000     $ 1,000
Junior subordinated debentures | Old Second Capital Trust II [Member]              
Junior subordinated debentures              
Junior subordinated debentures   $ 25,800   $ 25,800