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Borrowings and Subordinated Debentures - Summary of Borrowings and Debentures (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Borrowings (including $124,434 and $123,116 at fair value, respectively) $ 1,440,875 $ 2,911,322
Rate 5.95% 4.92%
Assets Sold under Agreements to Repurchase, Interest Rate 5.25% 5.25%
Assets Sold under Agreements to Repurchase, Carrying Amount $ 174,000 $ 174,000
Total Borrowings 1,443,434 2,915,416
Acquisition Discount on Senior Notes $ (2,559) $ (4,094)
Subordinated Debentures    
Debt Instrument [Line Items]    
Rate 5.91% [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 $ 124,434 $ 123,116
Federal Home Loan Bank of San Francisco | Secured Debt [Member]    
Debt Instrument [Line Items]    
Line of credit, current $ 600,000 $ 0
Rate 4.56% 0.00%
Federal Home Loan Bank of San Francisco | Secured Debt [Member] | Bank Term Funding Program    
Debt Instrument [Line Items]    
Line of credit, current $ 545,000 $ 2,618,300
Rate 5.40% 4.37%
[1] Rates do not include the effects of discounts and issuance costs.