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Loans and Allowance for Credit Losses - Additional Information (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
segment
portfolio
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]        
Number of loan portfolios | portfolio 4      
Number of loan segments | segment 7      
Accrued interest receivable on loans $ 137,700,000 $ 47,600,000    
Allowance for credit losses $ 303,671,000 107,341,000 $ 131,388,000 $ 54,619,000
Loan placed on nonaccrual when past due, number of days 90 days      
Loan participations $ 2,300,000,000      
Loan participations sold 1,100,000,000      
Loan participations retained $ 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 TDR's included with non-accrual loans $ 24,000,000 11,700,000    
Financing receivable troubled debt restructurings specific reserves 4,500,000 700,000    
Unfunded commitments on TDRs 0 0    
Charge-offs $ (9,000) (36,000) (5,450,000)  
Number of days for a loan to be considered to be in payment default 90 days      
First Midwest        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Provision for loan losses $ 89,100,000      
Allowance for credit losses 96,300,000      
Troubled Debt Restructurings During Period        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Decrease in allowance for credit losses 3,800,000 (900,000)    
Charge-offs $ 0 $ 0 0  
Increase in allowance for credit losses     300,000  
Maximum        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Aggregate amount of loans to related parties 5.00% 5.00%    
Commercial real estate        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Percentage of risk-based capital 227.00%      
Regulatory guideline limit 300.00%      
Allowance for credit losses $ 138,244,000 $ 64,004,000 75,810,000 $ 20,535,000
Charge-offs $ (4,000) $ (24,000) $ (4,801,000)