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Borrowings and Subordinated Debentures (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Subordinated debt $ 863,300,000  
Unused lines of Credit    
Debt Instrument [Line Items]    
Line of Credit Facility, Amount Outstanding 0  
Line of Credit Facility, Current Borrowing Capacity 180,000,000  
Debt Instrument, Unused Borrowing Capacity, Fee 0  
American Financial Exchange    
Debt Instrument [Line Items]    
Line of Credit Facility, Amount Outstanding 0  
Federal Home Loan Bank of San Francisco    
Debt Instrument [Line Items]    
Loans Pledged as Collateral 6,200,000,000  
Line of Credit, Current 0 $ 5,000,000
Federal Home Loan Bank of San Francisco | Secured Debt    
Debt Instrument [Line Items]    
Line of Credit Facility, Borrowing Capacity, Description 4,000,000,000  
Line of Credit, Current 0 5,000,000
Federal Home Loan Bank of San Francisco | Unused lines of Credit    
Debt Instrument [Line Items]    
Line of Credit Facility, Borrowing Capacity, Description 112,000,000  
Federal Home Loan Bank of San Francisco | Unsecured Debt    
Debt Instrument [Line Items]    
Line of Credit, Current   0
Federal Reserve Bank Advances [Member]    
Debt Instrument [Line Items]    
Loans Pledged as Collateral 1,800,000,000  
Line of Credit Facility, Amount Outstanding 0 $ 0
Federal Reserve Bank Advances [Member] | Secured Debt    
Debt Instrument [Line Items]    
Line of Credit Facility, Borrowing Capacity, Description $ 1,400,000,000