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Business Combinations - Assets acquired and liabilities assumed (Details) - USD ($)
$ in Millions
Aug. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Business Combination [Line Items]        
Goodwill   $ 1,481 $ 1,029  
Columbia Banking Systems and Pacific Premier Bancorp Merger        
Business Combination [Line Items]        
Fair value of common shares issued and exchanged $ 2,355      
Total purchase price consideration 2,355      
Cash and due from banks 874      
Investment securities 2,828      
Loans held for sale 1      
Loans and leases 11,382      
Restricted equity securities 98      
Premises and equipment 53      
Other intangible assets 355      
Deferred tax asset, net 132      
Other assets 889      
Assets acquired 16,612 16,612   $ 0
Deposits 14,542      
Other liabilities 167      
Liabilities assumed 14,709 14,709   0
Net assets acquired 1,903 $ 1,903   $ 0
Goodwill $ 452