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Borrowings and Subordinated Debentures - Narrative (Details) - USD ($)
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Debt Instrument [Line Items]      
Net increase (decrease) in borrowings $ 1,864,815,000 $ (55,210,000)  
Unused Lines of Credit      
Debt Instrument [Line Items]      
Amount outstanding 0   $ 0
Current borrowing capacity 180,000,000    
Unused commitment fees 0    
AFX short-term borrowings      
Debt Instrument [Line Items]      
Current outstanding 250,000,000    
Amount outstanding 250,000,000   0
Credit-Link Notes      
Debt Instrument [Line Items]      
Other Borrowings, Fair Value Disclosure 132,815,000   0
Net increase (decrease) in borrowings 128,700,000    
Secured Debt $ 2,660,000,000    
Rate Index (Quarterly Reset) 11.00%    
Other Borrowings $ 132,815,000   0
Federal Reserve Bank Advances      
Debt Instrument [Line Items]      
Loans pledged as collateral 3,100,000,000    
Amount outstanding 0   0
Federal Reserve Bank Advances | FHLB secured advances      
Debt Instrument [Line Items]      
Borrowing capacity description 2,500,000,000    
Federal Home Loan Bank of San Francisco      
Debt Instrument [Line Items]      
Loans pledged as collateral 6,600,000,000    
Federal Home Loan Bank of San Francisco | Maturity Overnight [Member]      
Debt Instrument [Line Items]      
Current outstanding 1,400,000,000    
Federal Home Loan Bank of San Francisco | FHLB secured advances      
Debt Instrument [Line Items]      
Borrowing capacity description 5,600,000,000    
Current outstanding 1,370,000,000   0
Federal Home Loan Bank of San Francisco | FHLB unsecured overnight advance      
Debt Instrument [Line Items]      
Current outstanding 112,000,000   $ 0
Federal Home Loan Bank of San Francisco | Unused Lines of Credit      
Debt Instrument [Line Items]      
Borrowing capacity description $ 112,000,000