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Business Combinations - Preliminary Allocation (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 20, 2023
Mar. 19, 2023
Mar. 31, 2024
Dec. 31, 2023
Fair value of assets acquired:        
Cash & cash equivalents     $ (142)  
Fair value of liabilities assumed:        
Bargain purchase gain       $ 2,000
Signature Bridge Bank        
Business Acquisition [Line Items]        
Purchase Price consideration $ 85      
Fair value of assets acquired:        
Cash & cash equivalents 24,901      
Loans held for sale 232      
Total loans held for investment 11,741      
CDI and other intangible assets 464      
Other assets 413      
Total assets acquired 37,751      
Fair value of liabilities assumed:        
Deposits 33,507      
Other liabilities 2,149      
Total liabilities assumed 35,656      
Fair value of net identifiable assets 2,095      
Bargain purchase gain 2,010 $ 2,010    
Signature Bridge Bank | Previously Reported        
Business Acquisition [Line Items]        
Purchase Price consideration 85      
Fair value of assets acquired:        
Cash & cash equivalents 25,043      
Loans held for sale 232      
Total loans held for investment 12,218      
CDI and other intangible assets 464      
Other assets 679      
Total assets acquired 38,636      
Fair value of liabilities assumed:        
Deposits 33,568      
Other liabilities 2,982      
Total liabilities assumed 36,550      
Fair value of net identifiable assets 2,086      
Bargain purchase gain 2,001      
Signature Bridge Bank | Restatement Adjustment        
Fair value of assets acquired:        
Total loans held for investment (477)      
CDI and other intangible assets 0      
Other assets (266)      
Total assets acquired (885)      
Fair value of liabilities assumed:        
Deposits (61)      
Other liabilities (833)      
Total liabilities assumed (894)      
Fair value of net identifiable assets 9      
Bargain purchase gain 9      
Signature Bridge Bank | Commercial and industrial        
Fair value of assets acquired:        
Total loans held for investment 9,888      
Signature Bridge Bank | Commercial and industrial | Previously Reported        
Fair value of assets acquired:        
Total loans held for investment 10,102      
Signature Bridge Bank | Commercial and industrial | Restatement Adjustment        
Fair value of assets acquired:        
Total loans held for investment (214)      
Signature Bridge Bank | Commercial real estate        
Fair value of assets acquired:        
Total loans held for investment 1,680      
Signature Bridge Bank | Commercial real estate | Previously Reported        
Fair value of assets acquired:        
Total loans held for investment 1,942      
Signature Bridge Bank | Commercial real estate | Restatement Adjustment        
Fair value of assets acquired:        
Total loans held for investment (262)      
Signature Bridge Bank | Consumer and other        
Fair value of assets acquired:        
Total loans held for investment 173      
Signature Bridge Bank | Consumer and other | Previously Reported        
Fair value of assets acquired:        
Total loans held for investment 174      
Signature Bridge Bank | Consumer and other | Restatement Adjustment        
Fair value of assets acquired:        
Total loans held for investment $ (1)