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Acquisition and Divestiture Activity - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 15, 2022
USD ($)
agreement
shares
May 30, 2021
shares
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]                    
Number of deposit agreements (in agreements) | agreement 2                  
Decrease in goodwill     $ 5,623 $ 0 $ (954,540) $ 0        
Purchase price of loans at acquisition $ 1,400,000       1,400,831          
Par value of acquired loans at acquisition 1,500,000       1,488,365          
Allowance for credit losses at acquisition $ 78,500       78,531          
Accumulated benefit obligation     55,900   55,900          
Plan assets     72,400   72,400          
Allowance for credit losses     288,003 $ 109,444 288,003 $ 109,444 $ 280,507 $ 107,341 $ 114,037 $ 131,388
Premium to be received on account balance transferred     95,000              
Series A Preferred Stock                    
Business Acquisition [Line Items]                    
Shares issued for acquisition (in shares) | shares 108,000                  
Series C Preferred Stock                    
Business Acquisition [Line Items]                    
Shares issued for acquisition (in shares) | shares 122,500                  
Depositary Shares, each representing a 1/40th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series A                    
Business Acquisition [Line Items]                    
Shares issued for acquisition (in shares) | shares 4,320,000                  
Depositary Shares, each representing a 1/40th interest in a share of Non-Cumulative Perpetual Preferred Stock, Series C                    
Business Acquisition [Line Items]                    
Shares issued for acquisition (in shares) | shares 4,900,000                  
First Midwest                    
Business Acquisition [Line Items]                    
Shares exchange ratio   1.1336                
Number of shares to be received upon conversion (in shares) | shares   1                
Decrease in goodwill     5,600              
Other intangible assets $ 117,584                  
Transaction costs, expensed         77,900          
Transaction costs     36,600   77,900          
Allowance for credit losses     96,300   96,300          
First Midwest | Unfunded Loan Commitment                    
Business Acquisition [Line Items]                    
Allowance for credit losses     $ 11,000   $ 11,000          
First Midwest | Core deposit                    
Business Acquisition [Line Items]                    
Other intangible assets $ 77,900                  
Estimated useful lives 10 years                  
First Midwest | Customer trust relationships                    
Business Acquisition [Line Items]                    
Other intangible assets $ 39,700                  
Estimated useful lives 13 years                  
First Midwest | Series A Preferred Stock                    
Business Acquisition [Line Items]                    
Dividend rate   7.00%                
First Midwest | Series C Preferred Stock                    
Business Acquisition [Line Items]                    
Dividend rate   7.00%