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Basis of Presentation and Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Feb. 28, 2022
Feb. 15, 2022
Apr. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]            
FDIC assessment       $ 44,681 $ 56,730 $ 19,332
Issuance of common stock       417,598   2,446,312
Series A Preferred Stock            
Property, Plant and Equipment [Line Items]            
Shares issued for acquisition (in shares)   108,000        
Series C Preferred Stock            
Property, Plant and Equipment [Line Items]            
Shares issued for acquisition (in shares)   122,500        
Preferred Stock            
Property, Plant and Equipment [Line Items]            
Issuance of common stock $ 243,700          
First Midwest            
Property, Plant and Equipment [Line Items]            
Shares issued for acquisition (in shares) 129,400,000          
Issuance of common stock $ 2,400,000          
CapStar Financial Holdings, Inc.            
Property, Plant and Equipment [Line Items]            
Shares issued for acquisition (in shares)     24,000,000      
Issuance of common stock     $ 417,600      
Old National Bancorp            
Property, Plant and Equipment [Line Items]            
Estimated uninsured deposits           $ 12,000,000
FDIC assessment       $ 3,000 $ 19,100  
Minimum            
Property, Plant and Equipment [Line Items]            
Maturity of short-term securities sold under agreements to repurchase       1 day    
Minimum | Core Deposits and Other Intangible Assets            
Property, Plant and Equipment [Line Items]            
Estimated useful lives of core deposits and customer relationships       5 years    
Minimum | Building and Building Improvements            
Property, Plant and Equipment [Line Items]            
Useful lives for premises and equipment, years       10 years    
Minimum | Furniture and Equipment            
Property, Plant and Equipment [Line Items]            
Useful lives for premises and equipment, years       3 years    
Maximum            
Property, Plant and Equipment [Line Items]            
Maturity of short-term securities sold under agreements to repurchase       4 days    
Maximum | Core Deposits and Other Intangible Assets            
Property, Plant and Equipment [Line Items]            
Estimated useful lives of core deposits and customer relationships       15 years    
Maximum | Building and Building Improvements            
Property, Plant and Equipment [Line Items]            
Useful lives for premises and equipment, years       39 years    
Maximum | Furniture and Equipment            
Property, Plant and Equipment [Line Items]            
Useful lives for premises and equipment, years       7 years