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Loans and Allowance for Credit Losses - Additional Information (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
segment
portfolio
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
segment
portfolio
Sep. 30, 2021
USD ($)
loan
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]                
Number of loan portfolios | portfolio 4   4          
Number of loan segments | segment 7   7          
Accrued interest receivable on loans $ 123,600,000   $ 123,600,000     $ 47,600,000    
Provision for loan losses 10,558,000 $ 0 89,089,000 $ 0        
Allowance for credit losses 302,254,000 107,868,000 $ 302,254,000 $ 107,868,000 $ 288,003,000 107,341,000 $ 109,444,000 $ 131,388,000
Loan placed on nonaccrual when past due, number of days     90 days          
Loan participations 2,300,000,000   $ 2,300,000,000          
Loan participations sold 1,100,000,000   1,100,000,000          
Loan participations retained 1,200,000,000   $ 1,200,000,000          
TDR term     6 months          
Minimum number of days for loan charge off to be recorded     120 days          
Maximum number of days for loan charge off to be recorded     180 days          
Financing receivable TDRs included with non-accrual loans 23,800,000   $ 23,800,000     11,700,000    
Financing receivable TDR specific reserves 5,200,000   5,200,000     700,000    
Unfunded commitments on TDRs 3,000,000   3,000,000     0    
Financing receivable, TDR, number of loans qualified for removal | loan       1        
Charge-offs 0 (56,000) $ (9,000) $ (79,000)        
Number of days for a loan to be considered to be in payment default     90 days          
Troubled Debt Restructurings During Period                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Increase in allowance for loan losses     $ 5,500,000 0        
Charge-offs     0 0        
First Midwest                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Provision for loan losses 10,600,000   89,100,000          
Allowance for credit losses $ 96,300,000   $ 96,300,000          
Commercial real estate                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Percentage of risk-based capital 223.00%   223.00%          
Regulatory guideline limit 300.00%   300.00%          
Provision for loan losses $ 6,818,000 0 $ 49,419,000 0        
Allowance for credit losses 144,090,000 65,097,000 144,090,000 65,097,000 $ 141,802,000 $ 64,004,000 $ 65,469,000 $ 75,810,000
Charge-offs $ 0 $ (58,000) $ (4,000) $ (72,000)