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Merger, Acquisition, and Divestiture Activity - Additional Information (Details)
$ in Thousands
 3 Months Ended 11 Months Ended 12 Months Ended
Nov. 18, 2022
USD ($)
Feb. 15, 2022
USD ($)
agreement
shares
May 30, 2021
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
branch
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]                  
Number of deposit agreements (in agreements) | agreement   2              
Purchase price of loans at acquisition   $ 1,400,000       $ 1,390,273      
Par value of acquired loans at acquisition   1,500,000       1,488,365      
Allowance for credit losses at acquisition   $ 89,100       89,089      
Plan assets       $ 16,600 $ 16,600 16,600      
Allowance for credit losses       303,671 303,671 303,671 $ 107,341 $ 131,388 $ 54,619
Deposits, health savings accounts $ 382,000                
Gain on sale of health savings accounts $ 90,700         90,673 0 0  
Property optimization       26,800   26,818 $ 0 $ 27,050  
Number of banking centers to be closed | branch               31  
Series A Preferred Stock                  
Business Acquisition [Line Items]                  
Shares issued for acquisition (in shares) | shares   108,000              
Depositary shares, interest in non-cumulative perpetual preferred stock   2.50%              
Series C Preferred Stock                  
Business Acquisition [Line Items]                  
Shares issued for acquisition (in shares) | shares   122,500              
Depositary shares, interest in non-cumulative perpetual preferred stock   2.50%              
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            
Increase in goodwill         1,600        
Other intangible assets   $ 117,584              
Transaction costs, expensed           120,900      
Transaction costs           120,900      
Allowance for credit losses       96,300 96,300 96,300      
First Midwest | Unfunded Loan Commitment                  
Business Acquisition [Line Items]                  
Allowance for credit losses       $ 11,000 $ 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%