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Borrowings and Subordinated Debentures - Summary of Borrowings and Debentures (Details) - USD ($)
 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Debt Instrument [Line Items]      
Borrowings (including $119,624 and $123,116 at fair value, respectively) $ 1,591,833,000 $ 2,911,322,000  
Rate 5.12% 4.92%  
Assets Sold under Agreements to Repurchase, Interest Rate 5.25% 5.25%  
Assets Sold under Agreements to Repurchase, Carrying Amount $ 174,000,000 $ 174,000,000  
Total Borrowings 1,593,624,000 2,915,416,000  
Acquisition Discount on Senior Notes (1,791,000) (4,094,000)  
Federal Reserve Bank Advances      
Debt Instrument [Line Items]      
Balance $ 200,000,000 $ 0 $ 200,000,000.0
Rate 5.00% 0.00%  
Subordinated Debentures      
Debt Instrument [Line Items]      
Rate 5.82% [1] 5.93%  
Subordinated notes due May 2031      
Debt Instrument [Line Items]      
Rate Index (Quarterly Reset) 2.52%    
Subordinated notes due May 2031 | Subordinated Debentures      
Debt Instrument [Line Items]      
Rate 3.25% [1] 3.25%  
Subordinated Notes Due October 30, 2030 | Subordinated Debentures      
Debt Instrument [Line Items]      
Rate 4.375% 4.375%  
Rate Index (Quarterly Reset) 4.195%    
AFX short-term borrowings      
Debt Instrument [Line Items]      
Balance $ 0 $ 0  
Credit-Link Notes      
Debt Instrument [Line Items]      
Variable interest, percentage rate 16.05% 16.02%  
Other borrowings $ 119,624,000 $ 123,116,000  
Federal Home Loan Bank of San Francisco | Secured Debt [Member]      
Debt Instrument [Line Items]      
Line of credit, current $ 1,100,000,000 $ 0  
Rate 3.93% 0.00%  
Federal Home Loan Bank of San Francisco | Secured Debt [Member] | Bank Term Funding Program      
Debt Instrument [Line Items]      
Line of credit, current $ 0 $ 2,618,300,000  
Rate 0.00% 4.37%  
[1] Rates do not include the effects of discounts and issuance costs.