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Borrowings and Subordinated Debentures - Summary of Borrowings and Debentures (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Borrowings (including $117,196 and $118,838 at fair value, respectively) $ 1,670,782,000 $ 1,391,814,000
Rate 4.96% 5.06%
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 1,671,038,000 1,392,838,000
Acquisition Discount on Senior Notes $ (256,000) (1,024,000)
Federal Reserve Bank Advances    
Debt Instrument [Line Items]    
Balance   $ 0
Subordinated Debentures    
Debt Instrument [Line Items]    
Rate 5.33% [1] 5.48%
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 [2] 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 15.07% 15.29%
Other borrowings $ 117,196,000 $ 118,838,000
Federal Home Loan Bank of San Francisco | Secured Debt [Member]    
Debt Instrument [Line Items]    
Line of credit, current $ 1,379,842,000 $ 1,100,000,000
Rate 4.07% 3.93%
[1] Rates do not include the effects of discounts and issuance costs.
[2] Subordinated notes, net, issued at the Bank level rather than the holding company level.