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Fair Value Measurement - Fair Value Assumptions (Details) - Fair Value, Inputs, Level 3 - Valuation Technique, Discounted Cash Flow
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Minimum    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Discount rate 13.00% 13.00%
Credit risk rate 0.03% 0.03%
Market-servicing rate 0.62% 0.62%
Prepayment rate 5.99% 5.99%
Maximum    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Discount rate 20.00% 20.00%
Credit risk rate 62.06% 52.78%
Market-servicing rate 3.73% 3.73%
Prepayment rate 92.72% 91.43%
Weighted Average    
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Discount rate 17.56% 17.69%
Credit risk rate 17.84% 18.36%
Market-servicing rate 0.62% 0.62%
Prepayment rate 38.54% 36.39%