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Commitments and Contingencies (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]      
Loss Contingency, Receivable $ 22,500,000   $ 22,500,000
Loan subject to loss-sharing arrangements, aggregate unpaid principal amount 15,800,000,000   15,400,000,000
Loan loss accrual 24,800,000   24,600,000
Loan loss guarantee reserve 22,900,000   22,900,000
Loss Contingency Accrual [Roll Forward]      
Loss Contingency, Receivable 22,500,000   22,500,000
Loan loss guarantee reserve 22,900,000   $ 22,900,000
Insurance Claims [Member]      
Loss Contingency Accrual [Roll Forward]      
Loss Contingency Accrual 1,200,000 $ 48,200,000  
Loss Contingency Accrual, Provision 0 0  
Loss Contingency Accrual, Provision Adjustment 0 (30,200,000)  
Loss Contingency Accrual, Payments 0 (400,000)  
Loss Contingency Accrual $ 1,200,000 $ 17,600,000