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Fair Value Measurement - Schedule of Level 3 Fair Value Assumptions for Loan Servicing Assets and Liabilities (Details) - Fair Value, Inputs, Level 3 - Valuation Technique, Discounted Cash Flow
9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
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 0.05% 0.03%
Market-servicing rate 0.62% 0.62%
Prepayment rate 2.17% 0.53%
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 81.10% 91.76%
Market-servicing rate 3.72% 3.72%
Prepayment rate 96.90% 91.99%
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 16.92% 17.20%
Credit risk rate 15.04% 16.22%
Market-servicing rate 0.63% 0.62%
Prepayment rate 41.57% 41.19%