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Borrowings and Subordinated Debentures - Summary of Borrowings and Debentures (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Borrowings (including 132,815 at fair value) $ 1,864,815 $ 0
Rate 3.91% 0.00%
AFX short-term borrowings    
Debt Instrument [Line Items]    
Line of Credit, Current $ 250,000  
Balance $ 250,000 $ 0
Rate 3.20% 0.00%
Credit-Link Notes    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 12.98% 0.00%
Other Borrowings $ 132,815 $ 0
Federal Home Loan Bank of San Francisco | FHLB secured advances    
Debt Instrument [Line Items]    
Line of Credit, Current $ 1,370,000 $ 0
Rate 3.22% 0.00%
Federal Home Loan Bank of San Francisco | FHLB unsecured overnight advance    
Debt Instrument [Line Items]    
Line of Credit, Current $ 112,000 $ 0
Rate 3.11% 0.00%