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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Additions for acquired uncertain tax positions   $ 14,897 $ 0 $ 0
First Midwest        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Balance at beginning of period   0 0 0
Reductions for tax positions relating to prior years   (2,751) 0 0
Reductions due to statute of limitations expiring $ (1,100) (1,139) 0 0
Balance at end of period   $ 11,007 $ 0 $ 0