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Fair Value Measurement - Fair Value Assumptions (Details) - Fair Value, Inputs, Level 3 - Valuation Technique, Discounted Cash Flow
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
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% 15.00%
Credit risk rate 0.03% 0.03%
Market-servicing rate 0.62% 0.75%
Prepayment rate 5.99% 9.07%
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% 35.00%
Credit risk rate 52.78% 52.78%
Market-servicing rate 3.73% 0.75%
Prepayment rate 91.43% 89.01%
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 17.69% 22.69%
Credit risk rate 18.36% 17.19%
Market-servicing rate 0.62% 0.75%
Prepayment rate 36.39% 31.62%