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Acquisitions and Joint Ventures - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 24, 2024
Jan. 11, 2023
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Business Acquisition [Line Items]            
Goodwill       $ 2,868,068 $ 2,631,465 $ 2,514,104
Professional and outside services       $ 58,253 $ 107,497 $ 117,530
Ametros            
Business Acquisition [Line Items]            
Goodwill $ 228,185          
Professional and outside services     $ 3,100      
Equity interests acquired 99.40%          
Cash consideration $ 359,700          
Ametros | Core Deposits            
Business Acquisition [Line Items]            
Intangible assets $ 182,800          
Acquired intangible assets, useful life 25 years          
Ametros | Trade Names            
Business Acquisition [Line Items]            
Intangible assets $ 6,100          
Acquired intangible assets, useful life 5 years          
interLINK            
Business Acquisition [Line Items]            
Goodwill   $ 143,200        
Equity interests acquired   100.00%        
Deposits made by acquired company   $ 9,000,000        
Purchase price   174,600        
Cash consideration   158,600        
Contingent consideration   16,000        
Net assets measured at fair value   31,400        
Royal liabilities   15,900        
interLINK | Broker Dealer Relationship            
Business Acquisition [Line Items]            
Intangible assets   36,000        
interLINK | Developed Technology Rights            
Business Acquisition [Line Items]            
Intangible assets acquired   6,000        
interLINK | Non Competition Agreement            
Business Acquisition [Line Items]            
Intangible assets   $ 4,000