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Basis of Presentation and Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands, shares in Millions
 1 Months Ended 12 Months Ended
May 31, 2025
Apr. 30, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]          
FDIC assessment     $ 48,394 $ 44,681 $ 56,730
Issuance of common stock (in shares)     1,033,262 417,598  
CapStar Financial Holdings, Inc.          
Property, Plant and Equipment [Line Items]          
Shares issued for acquisition (in shares)   24.0      
Issuance of common stock (in shares)   $ 417,600      
Bremer          
Property, Plant and Equipment [Line Items]          
Shares issued for acquisition (in shares) 50.2        
Issuance of common stock (in shares) $ 1,000,000        
Old National Bancorp          
Property, Plant and Equipment [Line Items]          
FDIC assessment     $ 3,000 $ 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