v3.26.1
Loans and Allowance for Loan Losses - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans $ 88,076,000,000   $ 88,076,000,000     $ 39,154,000,000    
Land held for future development, period (in year)     1 year          
Financing receivable, allowance for credit loss 956,000,000 $ 422,000,000 $ 956,000,000 $ 422,000,000 $ 942,000,000 442,000,000 $ 418,000,000 $ 414,000,000
Reserve for unfunded commitments 73,000,000   73,000,000     16,000,000    
All financing receivable, allowance for credit loss $ 1,000,000,000.0   1,000,000,000.0     $ 458,000,000    
Increase in allowance for credit loss     $ 571,000,000          
ACL to loans ratio (as percent) 1.17%   1.17%     1.17%    
Allowance for credit loss, reasonable and supportable forecast period (in year)     2 years          
Allowance for credit loss, straight-line basis historical period (in year)     1 year          
Allowance for credit loss, measurement input, estimated peak weighted average unemployment rate (in percent) 5.00%   5.00%     4.60%    
Financing receivable, modified, subsequent default $ 0 $ 0 $ 0 $ 0        
Commitments to land additional funds to TDRs 0   $ 0     $ 0    
Substandard                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Retail loan substandard period (in days)     90 days          
Loss                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Retail loan charge off (in days)     120 days          
Asset Pledged as Collateral                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans $ 38,300,000,000   $ 38,300,000,000     $ 15,700,000,000